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Method for leaching pyrolusite

A technology of pyrolusite and pyrolusite powder, which is applied in the leaching field of pyrolusite, which can solve the problems of low leaching rate, slow leaching speed, and high leaching temperature of the target metal manganese, so as to simplify the subsequent purification process and improve the leaching rate and reaction temperature. not high effect

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

AI Technical Summary

Problems solved by technology

Due to the MnO in pyrolusite 2 Insoluble in sulfuric acid, MnO needs to be roasted by reduction 2 MnO can be leached with sulfuric acid, but the conversion rate of roasting is only about 85%. As a result, when sulfuric acid leaches and reduces 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

[0022] Embodiment 1: 1000g pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and corn cob powder (1.5mm) 880g into a titanium-lined pressure reactor with a volume of 10L, add 6600ml of sulfuric acid solution with a concentration of 1mol / L, and the initial nitric acid concentration of the mixed solution is 2g / L , at 40°C to 50°C with airtight stirring (stirring speed 70r / min) for leaching for 2h. 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 98.1%.

Embodiment 2

[0023] Embodiment 2: 10kg pyrolusite powder (containing manganese 55.5%, Fe 2 o 3 6.7%, particle size 180 mesh) and 10.5kg of corncob powder (1.5mm) were added to a titanium-lined pressure reactor with a volume of 50L, and 23L of sulfuric acid solution with a concentration of 3mol / L was added, and the initial nitric acid concentration of the mixed solution was 8g / L L, leached at 60°C-70°C for 1 hour under airtight stirring (stirring speed 60r / min). Then pass O 2 (relative pressure is 0.15MPa) oxidation for 1h. According to the test and analysis results of the leached slag after washing, the leaching rate of manganese is 99.5%.

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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 corncob powder 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): C22B3/06C22B47/00
Inventor 龙炳清曹攀秦丹
Owner SICHUAN NORMAL UNIVERSITY
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