Abstract:The Magnetic separation of ultra-fine ore particles has always posed a challenge to the JONES/WHIMS process. Despite many advances in this technology, no effective improvement has been made to its core component: The Magnetic Matrix. The current approach to separate ultra-fine particles teaches that the gap of the matrix and its teeth size must be smaller than usual in order to accommodate the small size of the particles. However, practice proved this approach to be far from ideal. The closing of the gap betwe… Show more
“…Several authors have demonstrated a series of new technologies that could enhance magnetic separation processes through the development of new characterization techniques [27], equipment's [28][29][30][31][32][33][34] and the use of different matrices in high-intensity magnetic separation [35][36][37][38][39]. Such alternatives may result in significant gains in capacity, fines recovery, quality, and metallurgical recovery, as they make use of existing capacity and require low capital investment.…”
Section: Otimização Da Separação Magnética Da Hematita Contida No Pro...mentioning
The mining industry has seen a significant decline in mill feed grade in recent years, resulting in an ongoing build-up of materials not recovered at the mineral processing plants whose economic value has not yet been determined. Tailings dams have been the preferred method of disposal of such materials. However, recent dam breach events and the growing demand for mineral goods have enhanced the appeal of a more effective use of mined materials to prevent tailings accumulation and reduce social and environmental impacts, in line with the environmental, social and governance (ESG) principles that most companies have adopted. Different techniques can be used to recover economically valuable minerals contained in such materials, among which magnetic separation stands out for reasons of cost, production capacity, and recent developments of new equipment and matrices for wet high-intensity magnetic separators. The outcome includes gains in capacity, grade, and recovery yield. This paper assessed the use of a matrix developed by the company Gaustec, called BigFlux, in the magnetic separation of depressed product from the flotation process at Nexa Resources's Vazante mine. Laboratory-scale magnetic separation tests were conducted using standard and an optimized matrix. For a 59% iron concentrate, the metallurgical recovery using such optimized matrix reached 72.6%, up 4% from the figure resulting from the use of the standard matrix, thus indicating that the use of the optimized matrix can improve the magnetite recovery process of the studied material.
“…Several authors have demonstrated a series of new technologies that could enhance magnetic separation processes through the development of new characterization techniques [27], equipment's [28][29][30][31][32][33][34] and the use of different matrices in high-intensity magnetic separation [35][36][37][38][39]. Such alternatives may result in significant gains in capacity, fines recovery, quality, and metallurgical recovery, as they make use of existing capacity and require low capital investment.…”
Section: Otimização Da Separação Magnética Da Hematita Contida No Pro...mentioning
The mining industry has seen a significant decline in mill feed grade in recent years, resulting in an ongoing build-up of materials not recovered at the mineral processing plants whose economic value has not yet been determined. Tailings dams have been the preferred method of disposal of such materials. However, recent dam breach events and the growing demand for mineral goods have enhanced the appeal of a more effective use of mined materials to prevent tailings accumulation and reduce social and environmental impacts, in line with the environmental, social and governance (ESG) principles that most companies have adopted. Different techniques can be used to recover economically valuable minerals contained in such materials, among which magnetic separation stands out for reasons of cost, production capacity, and recent developments of new equipment and matrices for wet high-intensity magnetic separators. The outcome includes gains in capacity, grade, and recovery yield. This paper assessed the use of a matrix developed by the company Gaustec, called BigFlux, in the magnetic separation of depressed product from the flotation process at Nexa Resources's Vazante mine. Laboratory-scale magnetic separation tests were conducted using standard and an optimized matrix. For a 59% iron concentrate, the metallurgical recovery using such optimized matrix reached 72.6%, up 4% from the figure resulting from the use of the standard matrix, thus indicating that the use of the optimized matrix can improve the magnetite recovery process of the studied material.
“…Ademais, alguns fornecedores de equipamentos já consolidados como os concentradores WHIMS (Wet High Intensity Magnetic Separator) , têm desenvolvido matrizes (Ribeiro, Ribeiro e Vieira, 2022) que melhoram a performance desses dispositivos quando utilizados para concentração de minérios finos.…”
A busca por processos mais limpos com a redução de emissão de gases de efeito estufa já traz um grande desafio para a indústria de mineração e de produção de aço. Somado a isso, tem-se a escassez de minérios de altos teores de ferro e a necessidade de maiores recuperações metalúrgicas visando a redução do volume de rejeitos gerados. Isso tudo mostra que é cada vez mais importante o desenvolvimento de tecnologias disruptivas que consigam maximizar os processos de beneficiamento mineral. Assim, esse trabalho apresenta a caracterização física, química e mineralógica de uma amostra de rejeito de minério de ferro. Além disso, esse estudo mostra comparações entre os resultados de três processos de concentração mineral sendo eles: as novas tecnologias por concentração magnética VPHGMS (Vertically Pulsating High-gradient Magnetic Separator), matrizes Bigflux® e o tradicional processo de flotação.
Com a redução dos teores de ferro nos minérios na alimentação do processamento mineral, é necessário desenvolver processos adequados e busca de novas tecnologias aplicadas a separadores magnéticos capazes de recuperar o ferro contido nos rejeitos. A Empresa do segmento ArcelorMittal desenvolveu um projeto para processar o minério de ferro itabirítico da mina do Andrade, a fim de prolongar a vida útil da jazida, assim como aumentar a sua produção mineral, com resultados no processo atual de 28% de Fe no rejeito, o objetivo deste trabalho consiste em avaliar a possibilidade de reduzir a perda atingindo resultados menores de 20% de Fe.
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