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Melanterite is a mineral form of hydrous iron(II) sulfate: FeSO₄·7H₂O. It is the iron analogue of the copper sulfate chalcanthite. It alters to siderotil by loss of water. It is a secondary sulfate mineral which forms from the oxidation of primary sulfide minerals such as pyrite and marcasite in the near-surface environment. It often occurs as a post mine encrustation on old underground mine surfaces. It also occurs in coal and lignite seams exposed to humid air and as a rare sublimate phase around volcanic fumaroles. Associated minerals include pisanite, chalcanthite, epsomite, pickeringite, halotrichite and other sulfate minerals.
Method for purifying ferrous sulfate by-product of titanium dioxide production
The present application belongs to the technical field of metallurgical solid waste resource utilization, and particularly relates to a method for purifying ferrous sulfate by-product of titanium white. The method comprises the following steps: dissolving crude melanterite with water, and separating liquid and solid; adjusting the pH of the crude solution to 1-4 with acid, and adding a reducing agent for reduction reaction; immediately adjusting the pH of the reduced solution to 1-2 with acid to obtain a pre-crystallization solution; vacuum reducing pressure concentration; cooling crystallization to obtain ferrous sulfate crystals. The present application adopts a hydrolysis reduction-recrystallization coupling process to refine and purify crude melanterite, and the purification mechanisms of each link are connected in a loop and cooperatively remove impurities, so that precise control of impurities and step-by-step improvement of product purity are realized.
Owner:CENT SOUTH UNIV +1