Promising ways to increase raw material base of the chrome industry of the metallurgical industry of the Kazakhstan

Abstract

Various lumping technologies of finely dispersed chromite concentrates using charge roasting processes have been considered. In this respect, it was noted that the charge formulation used in the production does not provide the required strength of the produced pellets. The authors of the article propose the use of the well-known method for the ferrosilicon calcium fluxes (FSCF) synthesis with the replacement of Callovian clays with a composition based on diatomites and industrial and waste products of the Eurasian group (ERG) enterprises in order to increase the strength of pellets and agglomerate. This method enabled us to produce roasted pellets with high strength, to ensure the optimal ratio of components, to decrease the pellet roasting temperature by 150-200°C and to increase water resistance and congelation resistance. Technological parameters can be also improved by beneficiation of the source chromite raw material, effectively used by Turkish manufacturers of chrome products. One way to increase the chrome industry raw material base of the Republic of Kazakhstan is the involvement of the “12 Geophysical Deposit” into the processing of the industrial ore. However, the produced finely dispersed chromium concentrates require lumping followed by smelting in furnaces for ferrochrome. The high silica and iron content in the host rock of chromium concentrate enables to obtain strong pellets without additional additives.