Abstract
This chapter discusses the pyrite suppression in oil agglomeration of coal. The oleophilicity of pyrite frequently interferes with the separation of coal and pyrite in aqueous suspensions by selective agglomeration with oil. A series of preliminary tests in which an attempt was made to agglomerate sulfurized mineral pyrite in the presence of an agglomeration suppressant showed that the effective suppressants includes thioglycolic acid (TGA), thiolactic acid, mercaptosuccinic acid, 3-mercaptopropionic acid, and 2-mercapto-ethanesulfonic acid. The chapter presents typical results for sulfurized mineral pyrite in the presence of different concentrations of TGA at pH 4.5. A baseline experiment conducted without TGA showed that the pyrite was agglomerated readily with heptane because the turbidity of the particle suspension decreased steadily as the heptane dosage increased. In the presence of 0.0002 M TGA, the turbidity was greater than without TGA, indicating that the particles were dispersed more completely. Several bifunctional organic compounds have been identified that suppress the agglomeration of sulfurized pyrite with heptane. These compounds contain both a sulfhydryl group and either a carboxyl or sulfonic acid group.
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