US 4,485,073 A · Process of producing manganese sulfate solutions

Abstract

A process for preparing manganese sulfate solutions having reduced concentrations of potassium impurity is disclosed wherein a digestion mixture of a reduced manganese ore, a source of water soluble aluminum ions, a source of water soluble ferric ions and an aqueous acid solution is prepared, having a solution pH ranging from about 0.5 to about 3.5. The mixture is then digested at a temperature sufficient to produce a mixed digestion product comprising a liquid phase of a manganese sulfate solution and a solid phase of digested ore residue and a particulate complex salt by-product. The liquid phase of manganese sulfate solution is then recovered from the mixed digestion product. An additional feature of this process involves conducting the digestion of the digestion mixture in the presence of at least one complex salt of the general formula: MFe.sub.n Al.sub.3-n (SO.sub.4).sub.2 (OH).sub.6 where M is Na.sup.+, K.sup.+ or NH.sub.4.sup.+ and n is a number ranging from about 1 to about 3.

Claims21

Dependent claims

A process for the preparation of manganese sulfate solutions for use in the manufacture of electrolytic manganese dioxide, said solutions having substantially reduced concentrations of potassium impurity, comprising:

A. blending a reduced manganese ore, an added source of water soluble aluminum ions, a source of water soluble ferric ions and an aqueous acid solution selected from the group consisting of aqueous sulfuric acid and spent aqueous electrolyte containing sulfuric acid to form a digestion mixture having a solution pH ranging from about 0.5 to about 3.5;
B. digesting said mixture at a temperature sufficient to form a mixed reaction product comprising a liquid phase of manganese sulfate solution and a solid phase containing digested ore residue and a particulate complex salt byproduct or mixture of particulate complex salt byproducts and
C. recovering said liquid phase of manganese sulfate solution from said mixed digestion product.

A process for the preparation of manganese sulfate solutions for use in the manufacture of electrolytic manganese dioxide having substantial reduced concentrations of potassium impurity, comprising:

A. blending a reduced manganese ore, a source of water soluble aluminum ions, a source of water soluble ferric ions selected from the group consisting of iron sulfates, iron nitrates and iron chlorides and a spent aqueous electrolyte containing sulfuric acid to form a digestion mixture having a solution pH ranging from about 2.1 to about 2.8;
B. digesting said mixture at a temperature ranging from about 45.degree. C. up to about the boiling point of said mixture to form a mixed digestion product comprising a liquid phase of manganese sulfate solution and a solid phase of digested ore residue and a particulate complex salt byproduct or mixture of particulate complex salt byproducts and
C. recovering said liquid phase of manganese sulfate solution from said digestion product,
said mixture being digested while in contact with at least one complex salt corresponding to the general formula
MFe.sub.n Al.sub.3-n (SO.sub.4).sub.2 (OH).sub.6
where M is Na.sup.+, K.sup.+ or NH.sub.4.sup.+ and n is a number ranging from 1 to about 3.

3 more elements

Dependencies are inferred from the claim text.

Process of producing manganese sulfate solutions

Life of this patent

Process of producing manganese sulfate solutions

Life of this patent

Abstract

Claims21