Method for producing manganese sulphate by high temperature crystallization process

Abstract

The preparation method for manganese sulphate monohydrate by high temperature crystallization comprises: adding the manganese sulphate solution into crucible, stirring and heating to 152-245Deg, keeping for 5-55min; then, discharging some sewage, stopping stirring and heating, sending the solution to dissolution bath; after dissolving fully, pressure filtering, and keeping stable for more than 36h, pressure filtering again to obtain refined manganese sulphate solution; adjusting solution pH value to 2-3 with sulfuric acid, then pumping into crucible, stirring and heating to 152-199Deg within 20-80min, keeping for 5-55min, then discharging waste, and stirring again; heating to 152-199Deg and keeping for 5-55min, solid-liquid separating to obtain the final product. This invention has low energy consumption, high yield, no pollution to environment, and stable product quality.

Description

technical field [0001] The invention relates to a method for producing manganese sulfate, in particular to a method for producing manganese sulfate by high-temperature crystallization. Background technique [0002] Since the invention of dry batteries in 1868, manganese dioxide is the main positive electrode material of dry batteries, and its quality plays a decisive role in the performance of zinc-manganese dry batteries. [0003] Manganese dioxide used in dry batteries can be roughly divided into four categories: 1. Natural discharge manganese (NMD); 2. Active manganese dioxide (AMD); 3. Electrolytic manganese dioxide (EMD); 4. Chemical manganese dioxide ( CMD). [0004] Electrolytic manganese dioxide has a history of more than 60 years since its industrial production in 1940. Manganese dioxide produced by electrolysis can meet the quality requirements of high-capacity and high-power battery raw materials. Unfortunately, manganese dioxide produced by electrolysis has the...

AI Technical Summary

Problems solved by technology

[0008] 2. High energy consumption: 1.1-1.3 tons of coal is needed to produce 1 ton of manganese sulfate;

[0009] 3. Low recovery rate of manganese: the recovery rate of manganese is only 60-65%;

[0010] 4. Big environmental pollution

[0015] 2. High energy consumption: 1.1-1.3 tons of coal is needed to produce 1 ton of manganese sulfate;

[0016] 3. Low manganese recovery rate: the highest manganese recovery rate is only 60-65%