Mechanical activation of sulfide ores and concentrates

Abstract

The prevalence of metal sulfides in nature and their use as starting materials for the production of many metals are constant interest in the investigation and search for new ways of desulfurization. The traditional method of roasting desulfurizationis connected with technological complex by chain of the process which requires recovery of toxic sulfur dioxide dil and disposal. To speed up the process of dissolution and leaching can be used mechanical activation of sulphide and their mixtures with other substances in intense grinding machines. Mechanical processing of mineral raw materials to disperse is one of the most important mechanical operations.The ultimate size of the crushed mineral is one of locating factors whichaffect on the technological characteristics of hydrometallurgical and pyrometallurgical processes, as well as a factor determining the degree of extraction of the target metal. In the process of mechanical activation through com-plex mechanical action is a violation of the ideal structure of matter, the creation of various defects in the crystal lattice of the solid substance. During the processing of finely divided substances acquire new properties and undergo chemical transformations. In work explored influence of mechanical activation and fine grinding to modify the physic-chemical properties of sulfides. Also raw material processing parameters were investigated that influence the degree of desulfurization of arsenopyrite and molybdenite.Dry activation samples held in different time regimes on planetary centrifugal mill with different loading.Found that activation of the studied sulfides in dry mode leads to an increase in their chemical activity which results in lower-ing the temperature of the thermal oxidation.