Method for preparing high-purity trimanganese tetraoxide in ammonia medium using manganese sulfate solution

A technology of manganese sulfate solution and manganese tetroxide, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of high production cost, low recovery rate of manganese, excessive calcium and magnesium, etc. The effect of fast oxidation reaction

Inactive Publication Date: 2006-08-09
郝鹏飞
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Problems solved by technology

The process is mature, the production process is simple, and the investment is small. There are three most prominent shortcomings: one is high production cost; the other is high impurity content; the third is small specific surface area.
The method has a slow oxidation rate; the manganese recovery rate is low (about 85%); a large...

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: in 26 cubic meters manganese ion concentration is 30g.L -1 In the manganese sulfate solution at a temperature of 40°C, control the addition rate of ammonia water so that the pH value of the solution rises at a rate of 0.01 to 0.50 per minute, use air or oxygen as the oxidant, and the maximum pH value of the solution during the oxidation reaction process is not higher than 7.0. The minimum pH value of the solution during the reaction is 5, and the oxidation time is 12 hours, which can completely oxidize divalent manganese into trimanganese tetraoxide

Embodiment 2

[0015] Embodiment 2: in 26 cubic meters manganese ion concentration is 10g.L -1 and manganese sulfate solution at a temperature of 70°C, control the addition rate of ammonia water so that the pH value of the solution rises at a rate of 0.01 to 0.80 / min, use air or oxygen as the oxidant, and the maximum pH value of the solution during the oxidation reaction process is not higher than 8.0. During the reaction process, the minimum pH value of the solution is 6, and the oxidation time is 6 hours, which can completely oxidize divalent manganese into trimanganese tetraoxide

Embodiment 3

[0016] Embodiment 3: the manganese ion concentration is 70g.L in 26 cubic meters -1 In the manganese sulfate solution at a temperature of 40°C, the rate of adding ammonia water is controlled so that the pH value of the solution rises at a rate of 0.01 to 0.30 per minute, and air or oxygen is used as the oxidant. The maximum pH value of the solution during the oxidation reaction process is not higher than 6.0. The minimum pH value of the solution during the reaction is 5, and the oxidation time is 22 hours, which can completely oxidize divalent manganese into trimanganese tetraoxide

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Abstract

The invention discloses a method to produce high purity manganous-manganic oxide by manganese sulfate solution in ammonia medium. Adding ammonia into manganese sulfate solution that the concentration is 2g.L-1-120g.L-1, controlling the adding speed to make the pH value rising speed at 0-1.00/minute, using air or oxygen as oxidizing agent to oxide bivalent manganese into manganous-manganic oxide, the reaction temperature is 20-100 degree centigrade, controlling the highest pH value of the solution at the range of 6.0-14.0 in reacting process, and the lowest pH value range at 4.0-9.0. The invention has the advantage of fast reaction, the amount of precipitation of impurity calcium and magnesium could be controlled, and the yield of manganese would be improved, the cost is low.

Description

technical field [0001] The invention relates to a method for preparing high-purity trimanganese tetraoxide, in particular to a method for preparing high-purity trimanganese tetraoxide by direct oxidation of a manganese sulfate solution in an ammoniacal medium, and belongs to the technical field of manganese compound synthesis. Background technique [0002] High-purity trimanganese tetraoxide is an important raw material for the synthesis of soft magnetic manganese-zinc ferrite. At present, the main method for preparing trimanganese tetraoxide is the catalytic oxidation method of metal manganese powder plus ammonium salt. The process is mature, the production process is simple, and the investment is small. There are three most prominent shortcomings: one is high production cost; the other is high impurity content; the third is small specific surface area. For this reason, various other preparation methods have been studied at home and abroad, these methods include roasting m...

Claims

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Application Information

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IPC IPC(8): C01G45/02
Inventor 邹兴陈德胜孙宁磊郭建杨程刘福军杜丽王国承
Owner 郝鹏飞
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