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Method for separating sulfur in manganese oxides preparation process

A technology of oxide and manganese trioxide, which is applied in the preparation/purification of sulfur, manganese oxide/manganese hydroxide, etc., can solve the problems of difficult separation and removal, high sulfur content of oxide impurities, and easy control of reaction conditions. Good desulfurization effect and low cost

Inactive Publication Date: 2008-07-09
UNIV OF SCI & TECH BEIJING
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AI Technical Summary

Problems solved by technology

[0002] The preparation of manganese oxides by direct oxidation of manganese sulfate with air or oxygen has good development prospects due to the simple process and low cost of raw materials, but the manganese oxides prepared by this method have high impurity sulfur content and are difficult to separate and remove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0007] Example 1: Weigh a certain amount of manganese oxide with relatively high sulfur content into the reactor, add water according to the liquid-solid ratio of 4:1, stir, heat to 50°C, add sulfuric acid, control the reaction pH to about 2, and react for 4 hours , filtered, washed, dried, and heat-treated to obtain a sulfur content of less than 0.01% (as SO 3 Count) manganese oxide products.

example 2

[0008] Example 2: Weigh a certain manganese oxide with higher sulfur content into the reactor, add water according to the liquid-solid ratio of 9:1, stir, heat to 90°C, add sulfuric acid, control the reaction pH to about 4, and react for 3 hours , filtered, washed, dried, and heat-treated to obtain a sulfur content of less than 0.01% (as SO 3 Count) manganese oxide products.

example 3

[0009] Example 3: Weigh a certain manganese oxide with higher sulfur content into the reactor, add water according to the liquid-solid ratio of 3:1, stir, heat to 80°C, add sulfuric acid, control the reaction pH to about 1, and react for 5 hours , filtered, washed, dried, and heat-treated to obtain a sulfur content of less than 0.01% (as SO 3 Count) manganese oxide products.

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PUM

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Abstract

The invention provides a process to separate sulfur in a process for preparing manganese oxide. The sulfur of the manganese oxide mainly exists in the form of basic manganese sulfate and soluble sulfate which is partially packed, wherein the manganese oxide is produced by oxidizing manganese sulfate solution which employs air or oxygen at a certain temperature and a certain pH value. The invention utilizes the peculiarity of the basic manganese sulfate which is easy to be dissolved in acid medium, treats by controlling the temperature of the manganese oxide slurry and pH value of the solution, guarantees that the manganese oxide is dissolved as little as possible, simultaneously enables the basis manganese sulfate to be dissolved as much as possible, and enables that the packed soluble sulfate is relieved as much as possible to achieve the purpose of separating the sulfur. Manganomanganic oxide which yields low sulfur or dimanganese trioxide is obtained by the filtering, washing, drying and heat-treating of the slurry which is separated with sulfur. The invention has the advantages that reaction conditions are easy to be controlled, the effect of removing sulfur is fine and the cost is low.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, in particular to a method for separating sulfur during the preparation of manganese oxides. Background technique [0002] The preparation of manganese oxides by direct oxidation of manganese sulfate with air or oxygen has good development prospects due to the simple process and low cost of raw materials. However, the manganese oxides prepared by this method have high impurity sulfur content and are difficult to separate and remove. After my own research, I found that the source of the high sulfur in the manganese oxide product caused by this method is basic manganese sulfate and a small amount of soluble sulfate. Basic manganese sulfate is the product of partial hydrolysis of manganese ions in manganese sulfate solution. Its formation is related to factors such as manganese ion concentration, sulfate ion concentration, solution pH value, temperature, etc., and it is difficult to avoid its gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C01B17/02
Inventor 邹兴邹端端
Owner UNIV OF SCI & TECH BEIJING