Estudos de correlação entre concentração magnética em escala de bancada, piloto e industrial

• Ano de defesa: 2014
• Autor(a) principal: Nilson Nedes de Paula
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Engenharia Metalúrgica e de Minas; Engenharia metalúrgica
• Link de acesso: http://hdl.handle.net/1843/BUBD-9VNH4Q

This work presents the results of a correlation study involving magnetic concentration in pilot-industrial and laboratory-pilot scales. The tests that support this study were carried out in TRC (Vale Company Technology Research Center). The correlation between the pilot and industrial scale tends to be straightforward, once that pilot magnetic concentrators are similar industrial magnetic concentrators. Moreover, its understood that the correlation between laboratory and pilot scales is not as straightforward. They require a greater understanding/knowledge to describe them. Usually a magnetic concentration test pilot consumes a large amount of sample and requires many people for carry out it. There is necessity studying more correlations between: laboratory, pilot and industrial scales, because difficulty in carry out pilot tests with borehole samples and uncertainty of the results obtained in laboratory. Also took up this work to study a way improving the current model used by TRC in mineralogical interpretations about magnetic concentration process. The study methodology was divided in six phase: choice of samples, industrial sampling, characterization of the samples, mineralogical interpretation, pilot test, laboratory test and correlation analysis. The first batch of tests was carried out with five samples: Cauê Jones feeding, Alegria Jones, Brucutu rougher Jones, Brucutu cleaner Jones and Pico rougher Jones. For all them, pilot testing, laboratory testing, size analysis and mineralogical interpretation were carried out. The second batch of tests was conducted with five samples from dam Fábrica, Vale Company operating unit, located along the federal highway 040 to approximately 70 kilometers from Belo Horizonte city. For these samples only laboratory tests and pilot tests were carried out. Regarding the results, this study confirms the mineralogical interpretation as a good way to estimate mass recovery and concentrate quality in magnetic concentration process. Moreover and model currently used by TRC presents better results compared to modifications proposed this paper. The pilot tests results are similar to industrial results, confirming the correlation between pilot and industrial scales is straightforward. It was checked that, for most of samples studied, the laboratory tests in comparison to pilot, present lower contents of SiO2 on concentrate and higher contents of Fe on tailings. Finally, this study confirms thats possible to correlate the laboratory and pilot results, using regression equations to estimate pilot results from laboratory results, once that the graphs presents good correlation. However, its understood that for this work woud be necessary to perform additional tests, once the sample space is small.