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Method of preparing manganese sulfate solution by reducing pyrolusite

A technology of manganese sulfate solution and sulfuric acid solution, which is applied in the direction of manganese sulfate, can solve the problems of high environmental protection pressure, long reductive leaching time of ore, and high energy consumption, and achieve the effect of reducing energy consumption

Pending Publication Date: 2019-11-01
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the relatively mature and industrialized method is the high-temperature carbon reduction-leaching method. Other methods have more or less shortcomings and problems that are still in the experimental research stage. However, the high-temperature carbon reduction-leaching method still has high energy consumption and ore reduction. Long leaching time, high pressure on environmental protection, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking 100g of pyrolusite as the research object, crush the ore until the particle size is less than 200 mesh, which is equal to 85%, then add the crushed pyrolusite (add 50g of sulfuric acid) to sulfuric acid with a concentration of 30%, stir evenly and heat to 95°C for 4 hours, so that part of the manganese dioxide becomes Mn 7+ and Mn 2+ , then add a reducing agent (150ml of 10% hydrogen peroxide and 2g of metal manganese), then control the reaction at 33°C for 100 minutes, and finally transfer to the leaching tank, add electrolytic manganese anolyte to maintain the liquid-solid ratio of 8:1, and control the temperature at 55°C , mechanically stirred for 6 hours, and the leaching rate of manganese was 92%.

Embodiment 2

[0028] Taking 100g of pyrolusite as the research object, crush the ore until the particle size is less than 200 mesh, which is 85%, then add the crushed anode slag (50g of sulfuric acid) to the sulfuric acid with a concentration of 50%, stir evenly and heat to 95°C for 4 hours, so that part of the manganese dioxide becomes Mn 7+ and Mn 2+ , then add reducing agent (20g iron sulfide and 50ml hydrogen peroxide) and then control the reaction at 50°C for 60 minutes, and finally transfer to the leaching tank, add electrolytic manganese anolyte to maintain the liquid-solid ratio of 10:1, control the temperature at 50°C, and mechanically stir After 8 hours of reaction, the leaching rate of manganese was 91.5%.

Embodiment 3

[0030] Taking 100g of pyrolusite as the research object, crush the ore until the particle size is less than 200 mesh, which is 95%, then add the crushed anode slag (add 100g of sulfuric acid) to sulfuric acid with a concentration of 30%, stir evenly and heat to 95°C for 5 hours, so that part of the manganese dioxide becomes Mn 7+ and Mn 2+ , and then add reducing agent (27% hydrogen peroxide 50ml and 4L H 2 S) After reacting at 40°C for 100 minutes, finally transfer to the leaching tank, add electrolytic manganese anolyte to maintain a liquid-solid ratio of 9:1, control the temperature at 80°C, mechanically stir the reaction for 6 hours, and obtain sulfuric acid after filtration Manganese solution, the leaching rate of manganese is 94.5%.

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Abstract

The invention discloses a method of preparing a manganese sulfate solution by reducing pyrolusite. The method comprises the following steps: (1) crushing the pyrolusite to obtain a product a; (2) adding a sulfuric acid solution into the product a, uniformly stirring the solution, and heating and insulating the solution to obtain a product b; (3) adding a reducer into the product b, and controllingthe temperature to react to obtain a product c; and (4) transferring the product c to a leaching tank, supplementing an electrolytic manganese anode solution to maintain a liquid-solid ratio, controlling the temperature, stirring the solution to react, and filtering the solution to obtain the manganese sulfate solution. Compared with an existing method of reducing carbon and acid leaching, the method has the beneficial effect of obvious cost advantage and environmental-friendly advantage.

Description

technical field [0001] The invention relates to a method for preparing manganese sulfate solution, in particular to a method for preparing manganese sulfate solution by reducing pyrolusite. Background technique [0002] Manganese ore resources are mainly manganese carbonate ore and pyrolusite. The former is easy to react with sulfuric acid. At present, the electrolytic manganese industry mainly uses this ore. With the continuous production of manganese industry, the grade of manganese carbonate ore used by manganese production enterprises has generally changed from the original The manganese content of 18% to 20% has dropped to only 13% to 15%. In contrast, the pyrolusite with a huge reserve of manganese content of 30% to 45% has a high reduction cost due to the inertness of manganese dioxide. Low utilization. Therefore, the development and utilization of pyrolusite will be the future development direction. [0003] Aiming at the leaching of pyrolusite, domestic and foreig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B47/00C22B3/04C22B1/00C01G45/10
CPCC01G45/10C22B1/00C22B3/04C22B47/00
Inventor 王家伟王海峰
Owner GUIZHOU UNIV
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