THE MODIFICATION OF PYRITE AND ARSENOPYRITE SPECIFIC SURFACE AND POROSITY AT THERMAL DECOMPOSITION

摘要

The paper contains the results of studying about modification of pyrite and arsenopyrite specific surface and porosity at their thermal decomposition. The studying of specific surface was carry out by B.E.T. - adsorption of nitrogen at his boiling-point. In our work were using the electron-microscopical, X-ray structure analysis and chemical analysis. There was established that the decomposition of pyrite and arsenopyrite accompany by increasing of pores volume from 0.303 • 10~(-3) to 1.23 • 10~(-3) at increasing of pyrite degree of decomposition about 41 % and then decrease about 0.131 • 10~(-3)m~3/g at degree of decomposition near 100 %. The surface area of pores increase from 0.31 to 1.085 m /g with following lowering due to enlargement and confluence of minor, small pores. Increasing of porosity accompany with increasing of particles windage that appear the result of heightened dust-furnace partially decomposing pyrite and arsenopyrite particles by air flow from furnace reaction zone. This explains heightened contention of sulfide sulfur in roast dust of sulfide concentrate.