Comparação entre o modelo de bond (wi) e hardgrove (hgi) na moagem do carvão: uma breve revisão

Abstract

Coal is a friable ore that in Brazil is presented in distinct species, its petrogenesis formation isfrom the burial of organic matter of variable composition, for use its processing is essential. One seeks to understand, through grinding, its physical characteristics and its geomechanicalbehavior before comminution. Thus, this work consists of a comparative analysis of grindability indices, between the Hardgrove index (HGI), which is historically the parameter used for coal crushing, and the Bond work index (WI), which estimates the total energy expenditure in ore reduction. The present work compares these indices making the correlation and demonstrate how they are complementary. The methodology consisted of a bibliographic analysis of scientific productions related to coal grinding and these indexes, comparing them in terms of performance and resistance of coal to grinding. In summary, the Bond index showed better efficiency in view of the modification of the WI equation. On the other hand, the HGI index should be taken into consideration mainly as a commercial estimate for coal milling results and, therefore, has great relevance for the industry. Therefore, the indices present a direct correlation.