Programa de Pós-Graduação em Engenharia de Recursos Naturais da Amazônia - PRODERNA/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/4044

O Programa de Pós-Graduação em Engenharia de Recursos Naturais da Amazônia (PRODERNA) do Instituto de Tecnologia da UFPA (ITEC) da Universidade Federal do Pará (UFPA), em nível de Doutorado, tem como objetivos principais: formar quadros profissionais qualificados na área de Engenharia de Recursos Naturais; incentivar a pesquisa e o aprofundamento dos estudos técnicos e científicos relacionados ao uso e a transformação de recursos naturais; e contribuir para o desenvolvimento científico e tecnológico da região Norte.

Navegar

Agora exibindo 1 - 17 de 17

Acesso aberto (Open Access)
Caracterização de material compósito incorporado com fibras de bambu (Bambusa Vulgaris) e resíduos sólidos industriais para utilizacao como componente estrutural para a construcao civil
(Universidade Federal do Pará, 2020-03-12) SANTOS, Alessandro José Gomes dos; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In the industry, the production of materials that bring less environmental impacts and that have high sustainability has been growing, mainly with regard to vegetable fibers and industrial waste. In this work, full isophthalic unsaturated polyester matrix, composites with bamboo vegetable fiber, composites with industrial residues (red mud, kaolin and copper) and hybrid composites with variation in the proportion of residues and fibers were made. The residues were used with granulometry of 100 MESH and the fibers in the lengths of 15mm and 30 mm, randomly arranged within the matrix. These fibers were used in natura and treated with 5% NaOH during the period of 2 (two) hours. The fibers were characterized in terms of their physical, mechanical and morphological properties. The composites were made by hand (hand lay-up) in the form of rectangular plates in metallic mold and pressed. The proportions of the mass fractions of the residues varied by 10%, 20%, 30% and 40%, whereas the mass fraction of fibers was varied by 1%, 2% and 3%. For the production of hybrid composites, the variation occurred up to the maximum saturation level of the matrix, with the proportion of residues / fibers of 10% / 3%, 20% / 3%, 30% / 3% and 40% / 3%, respectively. Bamboo fibers were chemically characterized by analyzing the levels of extractives, lignin and holocellulose. The residues were characterized mineralogically by means of X-Ray Diffraction (XRD). The composites were characterized physically (apparent porosity, water absorption and apparent specific mass), mechanically (traction, flexion and impact), flame retardancy and morphologically through Scanning Electron Microscopy (SEM) analysis. For physical characterization analyzes, 10 specimens (CP’s) were produced for each series. In the mechanical tests, 10 CP's were manufactured for the tensile tests, while for the flexion and impact tests, there were 8 CP's for each series. This same amount was used for the flame retardancy tests. After the physical tests, a small variation was observed with the addition of fibers and an increase in the Apparent Specific Mass with the addition of residues and fibers in the matrix. In the analysis by means of mechanical traction characterization, the best results of resistance limits in the values of 33.05 MPa were obtained for composites with 3% bamboo fibers treated with 15 mm in length and 33.11 MPa with bamboo fibers 30mm long without treatment. With the incorporation of waste, it reached a value of 40.25 MPa. In hybrid fractions the value reached 41.07 MPa with the addition of 20% kaolin residue / 3% bamboo fibers in the 15mm lengths with treatment. In flexion tests, the results were 150.94 MPa for the addition of treated 30mm fibers, 140.34 MPa for the addition of 20% kaolin residue and in the hybrids of 137.27 MPa for the addition of 30% kaolin residue / 3% bamboo fibers with 30mm treated. In the impact tests, the best results were 23.02 kJ / m² for the addition of 10% copper residue and 38.56 kJ / m² for the addition of 20% copper residue / 3% bamboo fibers with 30 mm long treated.
Acesso aberto (Open Access)
Desenvolvimento de uma estrutura sanduíche de base polimérica, produzida com resíduos das indústrias de mineração e metalurgia, para aplicação como painel divisório de ambientes internos na construção civil
(Universidade Federal do Pará, 2016-07-05) MIRANDA, Rossana Martins; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
The rechearch proposed to use solid wastes from kaolin and bauxite mining and metallurgical regional industries in a composite of sandwich structure to apply as internal divider panel environments. The blade was of unsaturated polyester matrix, double jute fabric and, kaolin waste (20 wt% polyester) and, the core, of polyurethane expansive and red mud (bauxite waste at process to get alumina), from 0 to 50 wt% PU (increasing by 10 to 10 wt%), in a total of 6 different treatments). The tests carried out were: blade density (ASTM C271/271M – 11), sandwich structure bulk density apparent, sandwich structure porosity, tensile test on the blade (ASTM D5083-10), flatwise tensile test on sandwich structure (ASTM C297/C297M - 04), edgewise compressive test on sandwich structure (ASTM C364/C364M–07), flatwise compressive test on sandwich structure (ASTM C297/C297M - 04), 3-point flexural test on sandwich structure (ASTM D7250/D7250M – 06 e ASTM C393/C393M – 11), Charpy impact test on sandwich structure (ASTM D6110 – 10), flammability test on blade and on sandwich structure (UL 94 - 96) and sound transmission loss test on sandwich structure (ISO 140-3:1995 - E). The results indicated that the choise of polymeric matrices was suitable to reduce weight of such structure mainly the use of a PU expansive. Increasing red mud not contributed to significant increase of sandwich structure bulk density apparent. Kaolin waste reinforcement increased resistance to blade on tensile test. Red mud reinforcement reduced sandwich structure resistance on flatwise tensile, flexural and impact tests. Increasing of red mud didn’t influenced sandwich structure edgewise compressive and flatwise compressive tests but, but it´s use at this sandwich structure, decreased their resistance at the first test and increased at the second test. The PU high flammability was delayed for being cloistered by two blades of polyester and kaolin, proving flame retardant property of kaolin waste. And about sound transmission loss test, the increase of red mud increased that until 20% concentration, after this, stabilized at 25 dB (STC) until 50% red mud. The composite, as a whole, presented feature of a sandwich structure, with a low density core, contributing to reduce structure weight and with higher resistant blades, providing it the desired structural feature to be a divider indoor panel.
Acesso aberto (Open Access)
Estudo da extração de compostos de ferro da lama vermelha visando a extração e/ou recuperação de compostos de titânio
(Universidade Federal do Pará, 2012-04) MAGALHÃES, Edilson Marques; MACÊDO, Emanuel Negrão; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/8718370108324505; http://lattes.cnpq.br/6157348947425968
The main concerns about waste generation are focused on the effects that these materials can have on human health and the environment, since the hazardous waste generated by industries need particular attention and care, because when improperly managed, become a serious threat to the environment. In this context, this work shows the studies for recycling of red mud as raw material to obtain titaniumcompounds. The study covers three hydrometallurgical routes: red mud calcined at 900°C (LV900), red mud without thermal treatment (LV-STT) and red mud sintered in a reducing atmosphere (LV1300). The leaching experiments were performed with temperature values of 60, 80 e 90°C and sulfuric acid concentration of 20 and 30%. Together with the analysis mathematical modeling was carried out leaching process. Such analysis shown that the red mud can be applied as a source of alternative raw material for the concentration and subsequent recovery of titanium compounds. The kinetic modeling of the curves of data extraction as a function of time and the mathematical model developed in this work, shown that, the chemical reaction step describes the leaching tests. The developed model also allowed obtaining kinetic parameters such as activation energy and velocity of chemical reactions of the leaching process.
Acesso aberto (Open Access)
Estudo da influência de resíduos gerados pela indústria de mineração nas propriedades de compósitos de matriz poliéster reforçados com fibras naturais
(Universidade Federal do Pará, 2016-02-26) COSTA, Deibson Silva da; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In this work, it was produced pure isophthalic unsaturated polyester matrix boards, composites with vegetable fibers (sisal, mauve and jute), composites with industrial waste (red mud, kaolin and ash) and hybrid composites with fibers and waste. The residues were used with a particle size less than 100 mesh and in fiber lengths of 15 mm arranged randomly within the matrix. The fibers were characterized considering their physical, mechanical and morphological properties. The composites were manufactured by a manual process called (hand lay-up) in the form of rectangular plates in metal and pressed mold. The proportions of the mass fractions of waste have varied by 10 % until saturation within the matrix, the mass fraction of fibers was fixed at 5 %. The composites were characterized physically (porosity, water absorption and bulk density), mechanically (tensile, bending and impact), thermally (thermogravimetry - TGA), mineralogically (diffraction of rays-X - DRX), flame retardance and morphologically (scanning electron microscopy - SEM). It was found with the insertion of waste and fibers in the composites, an increase of its physical, mechanical, thermal properties and flame resistance. The physical properties of porosity, water absorption and bulk density has increased significantly (6,7 % to 33 %) with the addition of constituents (residues and fibers). There was an increase (15 % to 95 %) in mechanical strength (tensile, bending and impact) of fiber composites and waste (10 %) composites with fibers. It was evident an improvement in thermal stability (10 % to 50 %) of composites with inclusion of waste. Only the red mud composites have presented a flame retardant ability, obtaining V-2 classification according to UL-94 standard. Morphological analysis of fracture surfaces was efficient in identifying the failure mechanisms and features present in the material. The composites manufactured in this study have resulted in materials with good properties, which makes them feasible candidates for certain types of applications such as panels, liners, partitions and internal doors, an inner lining of automobiles, residential rails and other applications of this nature, respecting the characteristics of these materials.
Acesso aberto (Open Access)
Estudo da influencia do residuo de beneficiamento de cobre sulfetado nas propriedades do concreto asfaltico
(Universidade Federal do Pará, 2016-11-25) KATO, Ricardo Bentes; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
With the development of industrial society, the demand for raw material has been increasing steadily over the last decades. Linked to this development occurs the generation of residues, which in the case of copper approximately 1% of the soil is exploited and transformed into commercial copper, the other 99% become waste of the process, being deposited in containment basins, where it is estimated 90 million tons the quantity contained in the Canaa dos Carajas plant, from where the residue of this work was obtained. This leads to high construction and maintenance costs, as well as generating a hazardous environmental liability. The objective of this work was to evaluate the addition of copper mining residue in replacement of the small aggregate in CA. In the dosage design it was verified that the content of 10% of residue in substitution to the small aggregate, more precisely 7.73% (obtained by regression), as the proportion that best suited the Marshall properties, even with lower CAP content In relation to the others, fact this provided by the type of fines of the residue. In general, the measured mechanical properties were not altered by the presence of the residue, except for the fatigue data, where the 20% and 25% mixtures showed superior performance, mainly because the resilience modulus values were statistically the same. The rheological data, compared to Superpav classification, were also unchanged, as well as the coating thickness given in the simulation in the SisPav, being in the order of 5 cm. In analyzing the potential for the use of waste, a positive conclusion was reached regarding the technological, environmental and economic aspects, with the possibility of consumption of more than 1.500.000 tons in roads close to the project, besides the economy with CAP consumption and Portland cement for trace correction.
Acesso aberto (Open Access)
Estudo da reciclagem de lodo de eta na fabricação de agregado sintético em mistura com cinza volante de carvão mineral
(Universidade Federal do Pará, 2016-11-22) SILVA, Elzelis Muller da; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
The Wastes (sludge) generated in the Water Treatment Plants (WTP) and fly ash from coal-fired power plants cause problems by the amount and concentration of harmful substances in them. Thus, this study aimed to produce synthetic aggregates using sludge WTP Bolonha (Belém/PA) and fly ash assessing their technical and environmental viability. The composition of the synthetic aggregates consisted of a high concentration of these residues in mixture with clay to molding and sintering at temperatures of 1200°C and 1250°C. The physical, mineralogical and microstructural analyzes of the synthetic aggregate were performed. Two concrete were produced, one with synthetic aggregate, and other references. In concrete were assessed their physical and mechanical properties in fresh and hardened state, and their microstructures. For the characterization of the concrete waste leaching and dissolution testing were performed. Synthetic aggregates were classified as lightweight aggregate for its low bulk density (<2.0 g / cm3) according to NBR 7211 (ABNT, 2009). The concrete produced with sintered aggregate (AGS-02) at 1250 °C was classified as non structural lightweight concrete according to the norms NBR 6118 (ABNT, 2014) and NBR 8953 (ABNT, 2015). The concrete of waste were classified as waste class IIB, non-hazardous and inert by NBR 10004 (ABNT, 2004) and within the limits of Resolutions No. 20/1986 and 430/2011 CONAMA into rivers class 2. It is noteworthy the synthetic aggregate meets the demands of the construction industry, reduces the consumption of raw materials and offers an alternative to the final disposal of waste.
Acesso aberto (Open Access)
Estudo da técnica de infusão de resina aplicada à fabricação de compósitos de matriz poliéster reforçados por fibras naturais da Amazônia
(Universidade Federal do Pará, 2014-03-26) RODRIGUES, Jean da Silva; FUJIYAMA, Roberto Tetsuo; http://lattes.cnpq.br/3165747089941318; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In this work were produced unsaturated polyester composites reinforced by fibers of curaua, jute and raffia, arranged in the form of fabric in plan style and aligned fibers. The composites were manufactured by resin infusion process, studying the main parameters that govern the manufacturing method, such as permeability and porosity of the reinforcement and architecture of infusion. Natural fibers were characterized according to their physical, morphological and mechanical properties. The curaua fiber reinforced composites were made using fibers in nature and treated by an alkaline NaOH solution at different concentrations. The composites were characterized in tests of tensile and impact strength, beyond of the determination of their physical properties such as density, porosity and volume fractions of the constituents. The results showed that the composites obtained better performance in tensile and impact were those reinforced with aligned curaua fibers manufactured under vacuum of 101.3 kPa. The evaluation of the cross section of the specimens showed that composites can provide partial saturation of wires or fiber reinforcement due to the vacuum level used mainly in reinforcements in the form of fabric with relatively larger diameter wires. The infusion process proved to be a good method of making composites reinforced with natural fibers, because in addition to being more environmentally friendly because it is a closed mold process, enabled the manufacture of products with high fiber content and good mechanical properties.
Acesso aberto (Open Access)
Influência da adição de nanotubos de carbono nas propriedades mecânicas da liga AL-2%NI solidificadas direcionalmente
(Universidade Federal do Pará, 2015-11-27) NASCIMENTO, Luiz Gabriel da Silva; SÁ, Fernando Antônio de; http://lattes.cnpq.br/8275621144223544; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In this work, we produced a hypoeutectic Al-2wt%Ni matrix, to which we added various concentrations of carbon nanotubes, in order to evaluate the evolution of the mechanical strength of the new material. The manufacturing process occurred by melting and ascending unidirectional abrupt cooling, with extraction of the heat transient and determination of the thermal variables involved in the solidification. Scanning Electron Microscopy images show how the nanotubes are settled in the matrix, and by means of Raman Spectroscopy, we were able to determine the “D” and “G” bands and analyze the action of the process over them. By means of metallographic and mechanical tests, we were able to characterize the macro and micro-structural behaviors and the mechanical properties. The addition of small quantities of nanotubes led to a significant raise in the mechanical strength of the matrix.
Acesso aberto (Open Access)
Influência da sílica e da temperatura nas propriedades físicas dos agregados sintéticos produzidos com resíduo do processo bayer
(Universidade Federal do Pará, 2019-03-21) SANTOS, Diego Hildebrando dos; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
The use of waste from the mining and metallurgy industry has become indispensable, so that this industrial segment is inserted in the concept of sustainable development. The work shows an application for red mud that, in combination with other materials such as silica and clay, produces a material with mechanical resistance and specific mass, which can be compared to the natural aggregates used by the civil construction industry. In the work all the raw materials and the final sintered product were submitted to x-ray diffraction analysis, scanning electron microscopy. Red mud and clay were also analyzed by x-ray fluorescence. The synthetic aggregates were produced with the intention of studying the relationship between the amount of silica used and the apparent specific mass, which had satisfactory results on sintered specimens at 1300 ° C, obtaining heavy aggregates with 10% silica and aggregates with values below 2 g/cm3 with 20% and 30% silica samples, characterizing so the aggregate as light. Therefore, the silica content, the amount of clay used together with the oxides present in the red mud, together with the ideal granulometry of these materials and the temperature, form a glassy phase that will give the aggregates important characteristics such as porosity, mechanical strength and apparent specific mass.
Acesso aberto (Open Access)
Influência do resíduo de flotação de minério de cobre nas propriedades físicas e mecânicas de compósitos de matriz termofixa e fibras de bananeira (musa sapientum, musacae)
(Universidade Federal do Pará, 2017-03-24) EL BANNA, Wassim Raja; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
Growing environmental concern has driven the development of alternative materials from renewable resources. The vegetable fibers have been used in various economic sectors to replace synthetic fibers. Vegetable fibers offer advantages such as low cost, are not toxic and low density. Hard particles are added the polymer to increase the modulus, increase the thermal conductivity of the composite as well as can increase toughness. This work has as objectives the mechanical analysis (tensile, flexural and impact), physical analysis (apparent density, porosity and water absorption), flame retardance analysis (flammability test) and morphological electron microscopy (scan) of the pure matrix, reinforced polymeric composite with flotation residue of copper ore, the polymeric composite reinforced with banana fibers and the hybrid polymeric composite reinforcement banana fibers and residue copper. The manufacture of the composites was performed by the manual process (hand lay-up) at room temperature, under pressure and using a standard metal mold. 10 specimens of the test piece for each fraction and the pure polymer matrix were manufactured. The polymer composites were manufactured by following its mass fractions: the fibers vary by 1%, 2% and 3%, the copper residue ranging in 10%, 20%, 30% and 40%, and the hybrid composite with 1% and 2% fiber with addition of 10% and 20% copper residue. The addition of the residue particles significantly increased the value of apparent density of the composite, in turn caused the decrease of the apparent porosity and water absorption. For the tensile tests the compound showed a significant better result was reinforced with 1% banana fiber with 38,50 MPa. Polymeric composites reinforced with 2% banana fiber, reinforced with 40% copper residue, and the hybrid composite with 2% fiber and 20% copper residue showed the best maximum flexural strain results with 156,03 MPa, 153,21 MPa and 198,16 MPa, respectively. And for the impact test, the composite that obtained the best results among the samples tested was the hybrid composite with 2% banana fiber and 20% copper residue with 21,26 kJ/m². The composites were not classified as flame retardant material, despite all they HB rating, they did not fit within the classification according to UL 94. The mechanical properties were evaluated from the tests carried out and the fractured surfaces were examined by scanning electron microscopy, in which the predominant mechanisms of failure in the composites that presented the best results were breaking of the fibers and for the fractions of 30% and 40% there was a better dispersion of the particles inside the matrix allowing the improvement of its properties.
Acesso aberto (Open Access)
Influência do uso de resíduo do processo bayer nas propriedades térmicas e mecânicas de compósitos de base polimérica reforçados com fibra de curauá (Ananas lucidus. Mill)
(Universidade Federal do Pará, 2015-05-15) CUNHA, Edinaldo José de Sousa; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
In this work it was produced composite isophthalic polyester, using red mud (RM) and fibers of carded curaua (FCC) randomly oriented and aligned with and without red mud. The composites were made by hand lay-up process and compression molding. Isophthalic polyester plates were produced composites with polyester matrix and composites with RM and RM and FCC. Physical, thermal and mechanical properties of the composites were evaluated. It was found that the increase in RM in 30% (v/v) improves the mechanical, thermal and physical properties of the composites. The addition of 25% (v/v) FCC and RM 5% (v/v) recovering at 84% the modulus of elasticity compared to composite with 10% (v/v) and 5% FCC RM. In composites with 5% FCC randomly oriented and 30% (v/v) RM has 29% recovery of the modulus of elasticity. In composites with 25% (v/v) shows RM to be effective flame retardancy. LV is the influence of the thermal conductivity of the composite isophthalic polyester with increased (92% to 0 ° C) (71% at 25 ° C) (69% at 50 °C) composites with 30% LV compared with the matrix. The red mud and curaua fiber may be important inputs in composite isophthalic polyester, for the production of panels, walls, doors and internal partitions for construction.
Acesso aberto (Open Access)
Influência do uso de resíduos industriais nas propriedades mecânicas e reológicas de argamassas utilizadas na indústria da construção civil
(Universidade Federal do Pará, 2019-03-21) CARDOSO, Dilson Nazareno Pereira; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/1711061955509303
The general objective of this work was to develop alternative and usable materials within the construction industry, addressing a logic of recovery and reuse of solid waste, generated from construction and demolition construction sites, as well as the reuse of waste generated from the construction industry mining industry and mineral processing. Were used in the work the residue of construction (RCC), residue of sulfide copper ore (RMCS) and the waste of circulating fluidized bed boilers from the combustion of coal to fly ash (CV). The samples of these materials showed appropriate characteristics, such as recycled fine aggregate within the NBR 7211 standard. The materials were subjected to physical and chemical characterization through laser particle size analysis, x-ray fluorescence (FRX), diffraction and x-ray (DRX).). The mortars produced were studied in the free state, that is, without additives and also within the insertion of polymeric organic additive polyvinyl acetate (PVA) and Styrene Butadiene (SBR). The obtained mortars were physically characterized through the analysis of apparent porosity, water absorption, apparent specific mass and resistance to axial compression. Thermal analyzes of (TG and DTG) and scanning electron microscopy - SEM were also performed. In the fluid state rheological tests were performed to evaluate its behavior according to time (thixotropy), workability and the most representative rheological model for its flow. The developed materials presented technical properties approved by the ABNT standards, making them suitable for certain types of applications, in terms of laying and covering of walls, floors and ceramic tiles, respecting the technical characteristics of these materials.
Acesso aberto (Open Access)
Obtenção e caracterização de ligas de ouro aplicadas ao setor joalheiro no estado do Pará
(Universidade Federal do Pará, 2014-06) MAIA, Raimunda Figueiredo da Silva; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968; SÁ, Fernando Antonio de; http://lattes.cnpq.br/8275621144223544
Gold has main application as adornment in jewelry pieces but in its pure state doesn’t have the hardness required for this use, being generally fused with other metals to form alloys. The aim of this research was to elaborate and characterize optical, structural and mechanical properties of gold alloys and introduce the use of intermetallic Au-20% Al, seeking to improve the production of jewelry industry. Four (4) gold alloys were prepared: one (1) intermetallic Au-20% Al violet colored and three (3) with usual coloration in jewelry manufacture (Au-25% Ag - light green, Au-12,5% Cu - red, Au-12,5% Ag-12,5% Cu - yellow). Au-20% Al alloy was produced in microproducers of the state of Pará workshops, while the others were fused in Materials Laboratory of Chemical Engineering School in Federal University of Pará (UFPA). The structural properties were analyzed by optical microscopy (OM) and scanning electron microscopy (SEM). The results revealed dendritic cell structure for Au-25% Ag and Au-12,5% Cu alloys, dendritic structure for Au-12,5% Ag-12,5% Cu alloy and cellular structure for Au-20% Al alloy. The mechanical properties were obtained through Vickers microhardness tests, evidencing the highest hardness for Au-20% Al alloy, intermetallic of AX2 type. The optical properties evaluated by colorimetric tests showed visible light spectrum in the range from violet color (Au-20% Al), greenish yellow (Au-25% Ag), red (Au-12,5% Cu) and yellow (Au-12,5% Ag-12,5% Cu).
Acesso aberto (Open Access)
Produção de material zeolítico a partir de caulim da Amazônia em escala semi piloto: aplicação na adsorção de cobre
(Universidade Federal do Pará, 2019-06-27) RODRIGUES, Emerson Cardoso; MACÊDO, Emanuel Negrão; http://lattes.cnpq.br/8718370108324505; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
This work aims to synthesize a zeolite product composed of zeolite type "A" plus sodalite using as filler kaolin starting material. The synthesis of Zeolites was carried out in a short time and in a system with agitation, in a reactor of stainless steel with a volume of approximately 0.001 m3, that is, in semi-pilot scale. The system was heated by steam from a boiler. The X ray diffraction (XRD), X ray Fluorescence Spectrometry, Scanning Electron Microscopy (SEM), Granulometric Analysis and Differential and Gravimetric Thermal Analysis (DTA and TG) were identified and characterized. In the synthesis process the metakaolin was used as the source of silica and alumina, which was obtained at 600 ° C for 2 hours of calcination in a muffle furnace. A 5M sodium hydroxide solution was used as the sodium source. Several syntheses were carried out for a maximum duration of 180 minutes. Every 30 minutes aliquots of the product were taken for the study of reaction kinetics. The results of the zeolite syntheses were satisfactory and the product obtained was applied to the adsorption of Cu2+ ions, in which the influence of the variables: time, temperature, pH and adsorbent quantity were evaluated. The determination of the best adsorption model was performed by the Monte Carlo method via Markov Chain and through the Akaike Information Criterion the isotherms that were closest to the presented results were established. The results obtained were compared with other studies available in the literature and showed significant values, which characterize the process of zeolite production and adsorption as promising and efficient.
Acesso aberto (Open Access)
Produção de zeólita a partir de cinza volante de carvão mineral para adsorção de metais em chorume gerado no lixão/aterro controlado na Região Amazônica
(Universidade Federal do Pará, 2022-01-28) DIAS, Lianne Maria Magalhães; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
The formation of solid waste has become a great challenge for the environment preservation due to the lifestyle adopted by modern society, which seeks for practicality and immediacy, and by that, new products are released, and waste formation is increased. The decomposition of waste from various sources creates a dark liquid denominated “slurry”, which presents high concentration of organic and inorganic compounds. This study aimed to evaluate the concentrations of Cd, Cu, Cr, Mn, Ni, Pb, and Zn on the ground and percolated liquid produced at the solid waste decomposition site in the metropolitan region of Belém/Pará/Brazil. Fly ashes of mineral coal were used to produce a low-cost zeolitic material, for removing copper, zinc, cadmium, and chrome, which are present at the percolated liquid of the Aurá landfill. The zeolites synthesized by alkaline fusion (ZSH and ZSJ), and without alkaline fusion (ZSD, ZSG, ZSK, ZSO), were characterized by different techniques, such as X-ray fluorescenc espectrometry, X-ray diffraction, and Scanning Electron Microscopy. The treatment adsorption efficiency of using adsorbent zeolitic material demonstrated viability to be used as an adsorvent agent for the adsorption of metals present at the leachate produced by landfills.
Acesso aberto (Open Access)
Reciclagem de resíduos industriais na fabricação de argamassas e placas cerâmicas premoldadas fabricadas a partir de matriz sílico-aluminosa destinadas a construção civil
(Universidade Federal do Pará, 2014-05) CARVALHO, Ronaldo Nonato Ferreira Marques de; MACÊDO, Alcebíades Negrão; http://lattes.cnpq.br/8313864897400179; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
It is proposed to manufacture plates in structured network of PVC pipes, filled with mortar composed of rejected materials of civil construction, and coal fly ash, hydrated lime and Portland cement, inspired by the traditional technique of earth construction called “taipa de mão”, employed in the State of Pará, Brazil. The final product is a contemporary and ecological construction system for the execution of partition panels, aiming the decrease and the reuse of waste construction’ materials, whose disposal causes environmental damage. The rejected materials have physical-chemical characteristics which allow its recycling, increasing the duration of their Life Cycle. Aiming to develop mortar’s material having characteristics as plasticity, elasticity and mechanical strength were made experiments with traces consisting of construction waste and Portland cement, duly processed and dosed for the confection of test bodies. These were submitted to the tests absorption of water, porosity, density, compressive strength and toughness, resulting in the selection of the most appropriate compound, in respect to use in manufacturing mountable ceramic plates for use in partition panels. The plates were submitted to the tests of compression and tension.
Acesso aberto (Open Access)
Síntese de produto zeolítico a partir de resíduo de caulim: produção de leito adsorvente aplicado a adsorção de íon amônio e cobre.
(Universidade Federal do Pará, 2021-11-04) PINHEIRO, Alice dos Prazeres; ROCHA JÚNIOR, Carlos Augusto Ferreira da; http://lattes.cnpq.br/9333542718006007; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
The development of new technologies has enabled and created new ways of using kaolin, besides the already known applications. One of these known uses is the use as starting material for zeolitic synthesis, a type of kaolin with great potential for this purpose is called hard kaolin. Due to the low crystalline structural degree, the hard kaolin is naturally more reactive for zeolitic synthesis. Having this condition available, the study in question aims to resort to this condition and evaluate the possibility of synthesis and reproducibility of the synthesis of zeolite using kaolin in natura, without previous thermal or chemical treatments and consecutive cationic calcium and lithium exchange. The conformation of the synthesized zeolitic product in various formats for subsequent application as an adsorbent product in a fixed bed column, also developed in the study for the adsorption of ammonium ion and subsequent desorption, with the intention of investigating the potential of the conformed product as a slow release fertilizer for agricultural purposes. X-ray diffractometry of the zeolitic product indicated the presence of crystalline peaks of zeolite A, sodalite and anatase. The electronic microscopy images presented a morphology analogous to wool balloons, characteristic of sodalite. The adsorption capacity obtained from the experiments performed in the fixed bed column developed in the study indicated good results with potential optimization of the adsorption system at different concentrations and ions.

Navegar

Navegando Programa de Pós-Graduação em Engenharia de Recursos Naturais da Amazônia - PRODERNA/ITEC por Orientadores "SOUZA, José Antônio da Silva"