ResumoA produção de finos de minério de ferro atualmente necessita de uma maior recuperação, sendo esta relacionada aos baixos teores de Fe referentes à escassez das jazidas e também intrínsecas à crescente demanda das indústrias siderúrgicas quanto a adequados teores de Fe, granulometria e de desempenho metalúrgico nos altos fornos. De maneira que, o objetivo deste trabalho foi o estudo da produção de pellet feed e sinter feed embasando-se somente na granulometria requerida para cada um desses produtos, que é uma variável muito importante dos concentrados, pois para a alimentação dos fornos de redução os concentrados com granulometrias inferiores têm necessariamente que passar por um processo de aglomeração. Sendo assim, a realização dos ensaios de bancada: britagem, moagem e classificação, foram indispensáveis para uma melhor investigação do circuito de concentração do minério de ferro itabirítico de aproximadamente 30,0 a 50,0 mm -lump, voltados para a produção de finos e ultrafinos. Os fatores impactantes correlacionados à produção de pellet feed e sinter feed são listados como sendo, a cominuição, a variação da massa de alimentação, a variação do diâmetro de abertura do gap do britador e moinho. Ensaios de peneiramento, de densidade e umidade do minério foram realizados para caracterizar o minério itabirítico. Palavras-chave:Cominuição; Granulometria; Minério de Ferro. AbstRActThe production of fine iron ore currently requires a greater recovery, which is related to low levels of iron due to the scarcity of deposits and also the intrinsic growing demand from the steel industry for appropriate Fe content, particle size and metallurgical performance in blast furnaces. So that, the objective of this work was to study the production of pellet feed and sinter feed basing solely on the particle size required for each of these products, which is a very important variable of the concentrates, as to feed the reduction furnaces the concentrated with lower grain sizes has necessarily to go through an agglomeration process.Thus, the performance of bench tests: crushing, grinding and classification were indispensable for further investigation about the concentration circuit of itabiritic iron with approximately 30,0 to 50.0 mm -lump, focused on the production of fine and ultrafine particles. The impacting factors related to the production of pellet feed and sinter feed are listed as comminution, the variation of the feed mass, the gap opening variation of the crusher and mill.Sieving, density and moisture tests were performed to characterize the itabiritic ore.
Technological characterization was used to define an iron ore processing route for the fraction (-8.00 +3.00 mm) with 55.00% of Fe content and 17.20% of SiO 2. Even having a considerable content of iron, this fraction was stored in waste piles since there was no previously interest for this fraction processing in the iron ore treatment facility of Mineração Congonhas in Catas Altas, Brazil. The characterization comprised mineralogical, chemical, granulometric and density analyzes. For the identification of the optimum process route two concentration methods were used, both in a bench scale and using a rougher stage: Route 1 consisted of a jigging and Route 2 used magnetic separation. The optimum concentration was encountered using the magnetic separation circuit, where the mass and metallurgical recovery were, respectively, 86.60% and 95.96, with a concentrate of 60.94% Fe and 10.91% SiO 2 content, which can then be further processed in a cleaner stage to meet the company's requirements.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.