Modelagem de matemática da operação de escrubagem da bauxita de Paragominas-PA

• Ano de defesa: 2010
• Autor(a) principal: COSTA, Jaime Henrique Barbosa da
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Escola Politécnica da Universidade de São Paulo; Brasil; Departamento de Engenharia de Minas e de Petróleo; Programa de Doutorado em Engenharia
• Palavras-chave em Português: Escrubagem; Modelagem; Bauxita; Tambor desagregador; CNPQ::ENGENHARIAS; Engenharia Mineral
• Link de acesso: https://repositorio.ifpa.edu.br/jspui/handle/prefix/249

The aim of this study was to investigate and model the bauxite scrubbing of bauxite samples from Miltonia 3, a Vale operation at Pará state, Brazil. The experimental program included the design of a standard laboratory test, from which parameters were derived for predicting the operation of a scrubber in steady state conditions. Three main variables were selected for the laboratory experimental program using the factorial design technique. These were load fraction, residence time and rotation speed. The amount of fines was determined through screening both feed and product of the scrubbing test. The former was considered as a material characteristic while the second was the dependent variable, i.e. the result of the scrubbing process. An empirical model was developed according to which the load fraction was found the most important variable to the scrubbing process. Residence time was also included in the model due to its importance in designing scrubbers for industrial plants. To validate the model a comprehensive pilot plant program was carried out with the same bauxite sample from Miltonia 3 deposit used in the laboratory investigations. The comparison between experimental data and model calculated values indicated a good agreement, as most values were within ±10% deviation range.