Abstract
Abstract In the Conceicao - MG mine, there are significant reserves of dolomitic itabirite, which is considered overburden material. This study aimed to develop a flotation route for the concentration of this dolomitic BIF according to the requirements of the steel industry. The characterization of samples, comminution, liberation size, microflotation of the pure dolomite and hematite minerals were performed to establish the conditions for selective separation in bench flotation tests. The microflotation tests showed that the soybean oil at pH 6 preferably floats the dolomite in relation to the hematite. The corn starch depressant at a pH higher than10 preferably depresses the hematite relative to the dolomite. The bench flotation tests revealed interactions between the factors pH, percentage of solids in the pulp, soybean oil and starch dosage. The optimal results for bench flotation tests were achieved under the following conditions: pH at 10.5, percentage of solids of 27wt%, dosages of soybean oil and corn starch of 400g/ton and 351g/ton, respectively.
Highlights
The high demand for iron ore products and the exhaustion of reserves with a high iron grade in the “Quadrilátero Ferrífero” of Minas Gerais in Brazil have led to the development of beneficiation of low grade “banded iron formations” (BIF) with the removal of overburden materials
CO2 from the carbonated phase, which is the explanation for the high value of the loss on ignition (LOI)
The dolomitic BIF of the Conceição mine is composed of dolomite and hematite, being the dolomite the majoritarian mineral
Summary
The high demand for iron ore products and the exhaustion of reserves with a high iron grade in the “Quadrilátero Ferrífero” of Minas Gerais in Brazil have led to the development of beneficiation of low grade “banded iron formations” (BIF) with the removal of overburden materials. They are composed of minerals without economic value, which are deposited in piles or replaced after mining. It has a similar texture of the siliceous BIF, with alternating bands of carbonate and iron, composed of dolomite, hematite and smaller quantities of quartz, and may contain varying amounts of calcite, talc, chlorite and amphiboles (Rosière et al, 2008)
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