Análise de dimensionamento de britadores de mineração em pequena escala

Abstract

Mining is one of the oldest activities in the world and is directly related to the development of the economy. Increased agricultural activity has led to high demand for the soil amendment industry. As a result, limestone extraction has increased significantly. According to the Agência Nacional da Mineração (ANM), 70% of Brazilian soil is considered acidic. The correction of this acidity with agricultural limestone is considered the most effective technique. The correction of this acidity with agricultural limestone is considered the most effective technique. Over time, mineral extraction techniques, as well as the way of use, have been improved, currently using more advanced technology for extraction and processing. Given these points associated with the growth of limestone extraction and improvements in mineral processing technology, this study aimed to analyze the sizing of crushers installed in a limestone mine located in the state of Mato Grosso in order to observe whether the mining company operates with recommended equipment or not. To compose this study, the mining operation flowchart, granulometric analyzes (by Split Desktop software) of the ROM and of the materials resulting from the output of the primary and secondary crushers, in addition to the sizing calculations of the crushers (reception condition, criterion of Taggart, process condition, bulk density and Reduction Ratio). From the characterization of the ore, the apparent density was calculated, in addition to the construction of granulometric curves that showed a reduction degree value of 1.51 in the primary crusher and 2.03 in the secondary crusher. An evaluation of the sizing of the primary and secondary crushers through the trials showed that, due to the large capacity of the plant, the primary crusher should be a conical one, and not a jaw crusher, as adopted by the mining company. And the primary crusher has a gap opening 2 times greater than the value indicated in theory, while the secondary crusher does not meet the need.