Abstract
The mining industry is famous for many paradigms regarding different flowsheet designs and the use of new technologies and equipment. In this context, a question often performed to process engineers is: what grinding circuit is more efficient, the direct or the reverse? A precise answer could only be given by experimental data and simulations. Simulations were performed using ModSimTM software considering parameters obtained by batch mill tests of an iron ore sample. The simulations, preliminarily, indicated no significant differences between the two circuit configurations for the sample tested. Subsequently, tests were conducted on a pilot scale with detailed measurement of all the variables necessary for a correct interpretation of the differences between the direct and reverse circuits. The test results confirmed the prediction obtained by simulation. This work provides the basis to test other ores and to understanding better the real differences between grinding circuit configurations. Thus, it is expected that some myths of the mineral industry, with respect to flowsheet choices, are overcome
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