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Method for restraining generation of manganous dithionate in process of leaching sulfur dioxide gas out of pyrolusite

A technology of manganese dithionate and sulfur dioxide, applied in the fields of environmental protection and metallurgy, can solve the problems of increasing the difficulty of iron removal, failing to realize industrialization, and being difficult to meet industrialized continuous production, and achieve the effect of inhibiting the generation of manganese dithionate.

Inactive Publication Date: 2010-01-06
成都合众新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if this method is used for industrial production, the following problems will occur: 1) the leaching temperature must reach above 95°C, and a large amount of heat energy needs to be consumed for heating the pulp; 2) the pH value of the leachate is lower than 3.5, and additional sulfuric acid needs to be consumed; 3 ) Although by adjusting the Fe 3+ / Fe 2+ The concentration ensures that the oxidation-reduction potential (ORP) is greater than or equal to 550mV (relative to the Ag / AgCl reference electrode); but the initial Fe 3+ Concentration greater than 4g / L, not only need to increase the addition of Fe3+, but also increase the difficulty of subsequent iron removal (purification and iron removal requires total iron to be less than 0.1mg / L); 4) SO4 is introduced during the leaching process 2 The time is not less than 10h, which means that SO 2 The gas is fed intermittently, which is difficult to meet the needs of industrial continuous production
Due to the constraints of the above problems, this method has not been able to realize industrialization so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Water, pyrolusite with a particle size of not less than 100 meshes and granular charcoal activated carbon with a particle size in the range of 0.1 to 10 mm are made into pyrolusite slurry according to the mass ratio of water: pyrolusite: granular charcoal activated carbon of 10: 1: 0.5. After the ore pulp is injected into the reactor, sulfur dioxide gas is introduced into the reactor, and air is blown into the reactor slurry at the same time, and the pH value of the slurry is monitored by a pH online monitor, so that the pH value of the slurry is lower than 3.5. The air blowing is automatically controlled, and when the pH value of the slurry is greater than 3.5, the blower is started to blow in air.

Embodiment 2

[0027] Water, pyrolusite with a particle size of not less than 100 mesh and granular coke activated carbon with a particle size in the range of 0.1 to 10 mm are formulated into a pulp according to the mass ratio of water: pyrolusite: granular coke activated carbon of 10:2:0.2, and the pulp is beaten After entering the reactor, feed sulfur dioxide gas into the reactor, and at the same time blow air into the reactor slurry, and monitor the pH value of the slurry through a pH online monitor, so that the pH value of the slurry is lower than 3.5. The air blowing is automatically controlled, and when the pH value of the slurry is greater than 3.5, the blower is started to blow in air.

Embodiment 3

[0029] Water, pyrolusite with a particle size of not less than 100 mesh and granular activated carbon with a particle size in the range of 0.1 to 10 mm are formulated into a pulp according to the mass ratio of water: pyrolusite: granular activated carbon at 10:5:1.0, and the pulp is poured into the reactor Finally, feed sulfur dioxide gas into the reactor, and at the same time blow air into the reactor slurry, and monitor the pH value of the slurry through a pH online monitor, so that the pH value of the slurry is lower than 3.5. The air blowing is automatically controlled, and when the pH value of the slurry is greater than 3.5, the blower is started to blow in air.

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Abstract

The invention discloses a method for restraining the generation of manganous dithionate in the process of leaching sulfur dioxide gas out of pyrolusite, which comprises the following main technical measures: (1) pyrolusite pulp is prepared by stirring and mixing in the proportion that 100-500g of pyrolusite and 0.2-100g of granular active carbon are added into 1L of water; (2) in a synchronous reaction process of absorbing the sulfur dioxide gas by the pyrolusite pulp, desulphurizing and leaching manganese, the pH value of the pyrolusite pulp is controlled to be lower than 3.5 by blowing oxygen or air into the pyrolusite pulp. The method restraining the generation of the manganous dithionate does not need to extra consume sulphuric acid and guarantee an oxido-reduction potential by extra adjusting the concentration of Fe<3+> / Fe<2+>, is easy to meet the requirement of industrial process production and can guarantee the concentration of a manganese sulfate mother liquor.

Description

technical field [0001] The invention relates to a method for inhibiting the formation of manganese dithionite in the process of leaching pyrolusite with sulfur dioxide gas or waste gas containing sulfur dioxide, which is used for improving the purity of manganese sulfate mother liquor in the process of leaching pyrolusite with sulfur dioxide gas or waste gas containing sulfur dioxide. The invention belongs to the technical fields of metallurgy and environmental protection. Background technique [0002] In the process of hydrometallurgical processing of pyrolusite, manganese dioxide (quaternary manganese) which is insoluble in acidic solution must first be converted into acid-soluble manganese monoxide (divalent manganese) through reduction reaction. The currently commonly used reduction roasting method requires large investment, high energy consumption, and great environmental pollution, and is only suitable for processing high-grade pyrolusite rich ore. It is economically u...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B47/00
Inventor 苏仕军丁桑岚
Owner 成都合众新能源科技有限公司
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