Navegando por Assunto "Metallurgical industry"

Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Aplicação de sensores virtuais na inferência da temperatura de banho no processo de fabricação de alumínio primário
(Universidade Federal do Pará, 2009-12-14) SOARES, Fábio Mendes; OLIVEIRA, Roberto Célio Limão de; http://lattes.cnpq.br/4497607460894318
Nowadays, industries worldwide are looking forward to enlarge their profits and become more competitive. A good management is a key factor to accomplish the company’s target, however all management decisions are supported by tools that provide good and relevant information for the process, which usually influences decision making strategically. Soft Sensors have been applied in industries which are aiming that target and its use has been growing lately. A soft sensor can be adapted to any application regarding variable measurement, therefore reducing operational costs without compromising the current information quality, and in some cases, better results can be obtained. Since they are software based, they are not subjected to physical damages as real sensors are, so they can be adapted virtually to hostile environments. The key of this kind of sensor success is the use of computational intelligence techniques, which has been heavily used in nonlinear and highly complex process modeling. Currently, many industries already use them successfully, and this work exploits its use with Neural Networks in a chemical process in an important Brazilian Aluminum Smelter whose control is very hard to maintain once it is not easy to retrieve information from the plant due to its corrosive nature and whose measurements require some operational resources. The usage of soft sensors within it may reduce costs and delays of measures drastically. A case of use of the soft sensor for temperature measure is presented on this work, since its design through implementation at production, according to a researched methodology.
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.