A procedure to separate the sulfur and the iron contained in mixtures of sulfide mineral and aqueous solutions of sulfuric acid (Machine-translation by Google Translate, not legally binding)

摘要

A process of separating sulfur and iron contained in mixtures of sulfide ore and aqueous solutions of sulfuric acid, comprising; 1) heat treating a sulfide mixture at temperatures below the melting temperature of the mixture in the presence of metallic iron to render the iron content substantially completely reactive with sulfuric acid to produce iron sulfate and gaseous hydrogen sulfide; 2) reacting the treated sulphide ore mixture with the acidic content of a sulfuric acid solution to produce a suspension containing gaseous hydrogen sulfide, solids containing the insoluble components of the feed and those impurities from the solution whose salts sulfur are insoluble in the solution in the presence of hydrogen sulfide gas, a neutral solution containing iron sulfate, at concentrations lower than saturation at 65º C, and those impurities from the feed materials that are soluble in the solution; 3) recover the gaseous hydrogen sulfide produced; 4) separating the insoluble solids from the neutral solution; 5) separating water from the neutral filtrate at temperatures below 64.8º C to produce solutions that are substantially saturated with iron sulfate at about 64.8º C; 6) heating the saturated solution with live steam from temperatures of about 64.8º C to temperatures substantially above 64.8º C to precipitate iron sulfate crystals monohydrate; and 7) separating the iron sulfate crystals monohydrate at a temperature above about 64.8º C. (Machine-translation by Google Translate, not legally binding)