Method for preparing manganese sulfate solution by using sulphur dioxide gas leach manganese dioxide ore

Abstract

The invention discloses a method for preparing a manganese sulphate solution by leaching pyrolusite with sulfur dioxide gas. The method mainly comprises: pyrolusite and water are prepared into pyrolusite slurry with a liquid to solid ratio of between 5:1 and 1:1; the slurry, the sulfur dioxide gas and oxygen are continuously passed into a reactor provided with two stages of absorbing and leachingreaction chambers which are arranged and connected serially up and down; and absorbing and leaching reactions are carried out in the two absorbing and leaching reaction chambers sequentially at normal temperature, wherein each stage of absorbing and leaching reaction chamber is provided with a stirrer of no less than 5 kW for each cubic meter, the mass flow of the slurry is determined by the stoichiometric ratio of manganese dioxide required by the mass flow of the sulfur dioxide, and the amount of the added oxygen is determined by the pH values of reaction systems in the absorbing and leaching reaction chambers. Another invention applied by the applicant of the invention discloses a reactor for use in pyrolusite leaching. The reactor realizes stable and continuous production, achieves high sulfur and manganese resources recovery rate, meets tail gas exhaust standards and can effectively suppress the generation of MnS2O6 at the same time.

Description

Method for preparing manganese sulfate solution by leaching pyrolusite with sulfur dioxide gas technical field The invention relates to pyrolusite leaching technology, more specifically, relates to a method for performing absorption and leaching reaction with sulfur dioxide and pyrolusite, so that sulfur resources and manganese resources can be comprehensively and complementary utilized. Background technique At present, the main methods of hydrometallurgical leaching of pyrolusite are: (1) ferrous sulfate method, the mixed solution of manganese sulfate and ferric sulfate is generated by the reaction of pyrolusite and ferrous sulfate, and then manganese sulfate solution is obtained through purification and iron removal (2) two mines add acid method, adopt pyrolusite and pyrite to react under the condition that sulfuric acid exists to generate the mixed solution of manganese sulfate and ferric sulfate, and mixed solution makes manganese sulfate solution through purification a...

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