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Method for leaching pyrolusite

A technology for pyrolusite and pyrolusite powder, which is applied in the field of pyrolusite leaching, can solve the problems of low leaching rate of target metal manganese, high leaching temperature, slow leaching speed, etc., achieves fast speed, improves leaching rate, and simplifies purification process Effect

Inactive Publication Date: 2014-04-30
SICHUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since MnO2 in pyrolusite is insoluble in sulfuric acid, MnO2 needs to be converted into MnO by reduction roasting to be leached with sulfuric acid, but the conversion rate of roasting is only about 85%. As a result, when sulfuric acid leaches and reduces the roasted pyrolusite, the leaching rate of the target metal manganese is not high, resulting in waste of resources
Although adding reducing agents such as FeS2 to the leaching system can directly leach pyrolusite with sulfuric acid, but the leaching speed is slow, the leaching temperature is high, and the leaching rate is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: 1000g pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and sawdust (1.5mm) 880g were added to a titanium-lined pressure reactor with a volume of 10L, and 6600ml of sulfuric acid solution with a concentration of 1mol / L was added. The initial nitric acid concentration of the mixed solution was 2g / L. Leach for 2 hours under airtight stirring (stirring speed 70r / min) at 40°C-50°C. Then pass O 2 (relative pressure is 0.1MPa) oxidation for 0.5h. According to the test and analysis results of the leached slag after washing, the leaching rate of manganese is 97.9%.

Embodiment 2

[0022] Embodiment 2: 10kg pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and sawdust (1.5mm) 10.5kg into a titanium-lined pressure reactor with a volume of 50L, add 23L of sulfuric acid solution with a concentration of 3mol / L, and the initial nitric acid concentration of the mixed solution is 8g / L, Leach for 1 hour at 60°C-70°C with closed stirring (stirring speed 60r / min). Then pass O 2 (relative pressure is 0.15MPa) oxidation for 1h. According to the laboratory analysis results of the washed leaching residue, the leaching rate of manganese is 99.3%.

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Abstract

The invention discloses a method for leaching pyrolusite. The method comprises the steps of adding pyrolusite powder with the particle size being not greater than 180 meshes and wood sawdust with the particle size being not greater than 1.5mm into a reaction kettle which is resistant to pressure and the corrosion of sulfuric acid and nitric acid, adding a mixed solution of sulfuric acid and nitric acid, leaching while stirring under closed conditions, exhausting reaction waste gas after leaching for a period of time, and introducing industrial pure oxygen under closed conditions, so as to oxidize a leachate.

Description

technical field [0001] The invention relates to a leaching method of pyrolusite. Background technique [0002] Pyrolulusite is an important raw material for the production of manganese metal, manganese sulfate, manganese dioxide, manganese nitrate and other materials. The wet process is the main process for producing the above materials, and the leaching process is an essential process in this process. In the wet process of producing metal manganese, manganese sulfate and manganese dioxide, sulfuric acid leaching system is basically used. Due to the MnO in pyrolusite 2 Insoluble in sulfuric acid, MnO needs to be roasted by reduction 2 It can be leached with sulfuric acid only after conversion to MnO, but the conversion rate of roasting is only about 85%. As a result, when the sulfuric acid leaching reduces the roasted pyrolusite, the leaching rate of the target metal manganese is not high, resulting in a waste of resources. Although adding FeS to the leaching system 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B47/00C22B3/06C22B3/08
Inventor 龙炳清林春李贵
Owner SICHUAN NORMAL UNIV