EFFECT OF COAL PYRITE SURFACE OXIDA- TION ON COAL DESULFURATION BY FLOTA- TION AND METHODS OF PYRITE DEPRESSION

摘要

This paper discusses the hydrophobicity of the pyrite surface under different extents of oxidation. Experi- mental results demonstrate that pyrite is floatable only under initial oxidation of its surface, while the fresh unoxidized or deeply oxidized surface of pyrite is hydrophilic. In the tests an organic reductant C_6H_3(OH)_3 was chosen as the pyrite de- pressant. It is highly efficient, and the sulfur in flotation can be significantly improved.