PYRITE DESULFURIZATION BY WET OXIDATION IN ALKALINE SOLUTIONS

K.-C. CHUANG Department of Chemical Engineering and Department of Engineering Science and Mechanics, Ames Laboratory, USDOE, Iowa State University, Ames, Iowa, 50011

M.-C. CHEN Department of Chemical Engineering and Department of Engineering Science and Mechanics, Ames Laboratory, USDOE, Iowa State University, Ames, Iowa, 50011

R.T. GREER Department of Chemical Engineering and Department of Engineering Science and Mechanics, Ames Laboratory, USDOE, Iowa State University, Ames, Iowa, 50011

R. MARKUSZEWSKI Department of Chemical Engineering and Department of Engineering Science and Mechanics, Ames Laboratory, USDOE, Iowa State University, Ames, Iowa, 50011

Y. SUN Department of Chemical Engineering and Department of Engineering Science and Mechanics, Ames Laboratory, USDOE, Iowa State University, Ames, Iowa, 50011

T.D. WHEELOCK Department of Chemical Engineering and Department of Engineering Science and Mechanics, Ames Laboratory, USDOE, Iowa State University, Ames, Iowa, 50011

Abstract

Particles of iron pyrites can be desulfurized by leaching them with a hot alkaline solution containing dissolved oxygen under pressure. As the reaction proceeds sulfur is extracted largely as soluble sulfates, and a shell of iron oxide is formed around a shrinking core of pyrite. The overall rate of the reaction seems to be controlled by diffusion of dissolved oxygen through the shell of iron oxide.

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PYRITE DESULFURIZATION BY WET OXIDATION IN ALKALINE SOLUTIONS

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