Process of recovery of sulphur from minerals containing pyrites
AssigneeSociete Nationale Elf Aquitaine
InventorDidier Anglerot
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Abstract
Production of elementary sulphur from an iron sulphide mineral, which comprises oxidizing acid lixiviation of the pulverized mineral, for extraction of the sulfur. The pulp obtained from the lixiviation is treated in the hot with an organic solvent for sulphur, the solvent having a density higher than 1, to separate this pulp into an aqueous phase containing in solution the non-ferrous metals, the sulphates of which are water soluble, and into a suspension of the solid of the pulp in an organic phase consisting of a solution of sulphur in the solvent separated by decantation and, after separation of the solid in suspension in the organic phase, the sulphur is recovered by crystallization after cooling of the organic phase.
Claims20
Process of production of elementary sulphur from an iron sulphide mineral, which comprises the oxidising acid lixiviation of the pulverized mineral for extraction of the sulphur, characterized in treating the pulp obtained from the lixiviation with an organic solvent for sulphur, the solvent having a density greater than 1, to separate the pulp into an aqueous phase containing in solution the non-ferrous metals, the sulphates of which are water soluble, and a suspension of the solid of the pulp in an organic phase comprising a solution of the sulphur in the solvent, separating the solid in suspension from the organic phase, and recovering the sulphur by crystallisation after cooling the organic phase.
Dependencies are inferred from the claim text.