A current concern related to low-grade stockpiles is to develop processing routes for the production of high-grade pellet feed. The stockpiles possess complex mineralogical composition of hematite and undesirable minerals bearers of aluminium and sulphur that require the development of a processing route aiming the production of high iron grade material with acceptable grades of contaminants. With an average iron grade of 48.6%, the material of the haematitic stockpiles was produced at the end of a beneficiation process consisting of crushing and screening. After grinding to achieve P80 106 µm, satisfactory concentration was achieved by magnetic separation (WHIMS) in three or four stages, depending on the desired product quality. Such flexibility led to the proposal of two possible processing routes. When the scavenger stage product is incorporated into the pellet feed, although the iron grade diminishes, the mass recovery increases by approximately 5%. The investigation proved that it is possible to produce pellet feed from the haematitic stockpiles with the processing routes tested. However, further grinding is required in order to adequate the material granulometry for its application as pellet feed.
ResumoMinérios de manganês são uma importante fonte de matéria-prima para a siderurgia. Desse modo, o desenvolvimento de trabalhos de caracterização para melhor compreensão da composição e o comportamento desses minérios é de suma importância. O presente trabalho teve como objetivo a caracterização física, química, mineralógica e a análise do comportamento de crepitação do produto granulado de minério de manganês de uma mina da região de Dom Silvério no estado de Minas Gerais. Cerca de 77% do produto granulado encontra-se entre 50 e 6,3mm. O minério de manganês é composto pelas fases minerais manganita, pirocroita, groutelita, birnessita, siderofilita e calcopirita. Os teores dos elementos majoritários Mn, Fe e SiO2 foram, respectivamente, 24,04%, 8,89% e 15,57%. A densidade estrutural da amostra é de 3,25 g/cm³ e sua área superficial, 6,8 m²/g. O ensaio de crepitação realizado mostrou que o índice desse fenômeno para a amostra com umidade natural é de 8,82% e se encontra próximo dos índices de crepitação de minérios de manganês atualmente comercializados no Brasil. A secagem da amostra não reduziu de forma significativa os índices de crepitação no minério. Palavras-chave: Minério de manganês; Caracterização; Crepitação; Ferro ligas de manganês. CHARACTERIZATION AND DECREPTATION STUDIES OF A MANGANESE ORE OF DOM SILVÉRIO-MG REGION AbstractManganese ores are an important source of raw material for ferromanganese alloys. Thus, the development of characterization work to better understand the composition and behavior of these ores is of paramount importance. This study aimed to the physical, chemical, mineralogical and analysis of the granulated product decreptation behavior of a manganese ore from a mine Dom Silverio region in the state of Minas Gerais. About 77% of the granulated product is between 50 and 6.3 mm. Manganese ore is composed of the mineral phases manganite, pyrochroite, groutellite, birnessite, siderophyllite and chalcopyrite. The amounts of the major elements Mn, Fe and SiO2 were, respectively, 24.04%, 8.89% and 15.57%. The structural density of the sample is 3.25 g / cm³ and a surface area 6.8 m² / g. The decreptation test conducted showed that the index of this phenomenon in the sample to the natural humidity is 8.82% and is close to sputter rates of manganese ores currently marketed in Brazil. Drying did not reduce significantly the decreptation indexes in ore (0.04%).
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.