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Efficient decomposition method for manganous dithionate in manganese ore sulfur dioxide lixivium

A technology of manganese dithionate and sulfur dioxide, which is applied in the field of efficient decomposition of manganese dithionate, can solve the problems affecting the preparation of electrolytic manganese from manganese sulfate products, unfavorable large-scale industrial application, and expensive reagents, so as to maximize the utilization and reduce the concentration , the effect of reducing energy consumption

Active Publication Date: 2019-11-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reagents used in this method are more expensive and costly, which is not conducive to large-scale industrial application. At the same time, new impurities will be introduced, which will affect the preparation of subsequent manganese sulfate products or electrolytic manganese.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The leaching solution is the leaching solution obtained from manganese ore pulp flue gas desulfurization reaction, and the MnS in the leaching solution 2 o 6 The concentration of sulfuric acid is 8g / L, and the molar concentration of sulfuric acid in the leaching solution is about 0.013mol / L (pH is about 1.6). Add sulfuric acid and δ-MnO sequentially under the condition of mechanical stirring 2 To sulfuric acid concentration of about 0.2mol / L, δ-MnO 2 The concentration of 40g / L, 90 ℃ constant temperature water bath reaction for about 3h after filtration, measured MnS in the filtrate 2 o 6 The concentration is 4.3g / L, under this condition MnS 2 o 6 The decomposition rate reaches 46.3%. Under the same initial conditions, keep the concentration of sulfuric acid in the solution constant (0.2mol / L), and the δ-MnO in the solution 2 concentration increased to 50g / L, reacted in a constant temperature water bath at 90°C for about 3 hours, then filtered, and the MnS in the ...

Embodiment 2

[0035] The leaching solution is the leaching solution obtained from manganese ore pulp flue gas desulfurization reaction, and the MnS in the leaching solution 2 o 6 The concentration of sulfuric acid is 8g / L, and the molar concentration of sulfuric acid in the leaching solution is about 0.013mol / L (pH is about 1.6). Add sulfuric acid and δ-MnO sequentially under the condition of mechanical stirring 2 To sulfuric acid concentration of about 0.4mol / L, δ-MnO 2 Concentration of 50g / L, 90 ℃ constant temperature water bath reaction for about 3h after filtration, measured MnS in the filtrate 2 o 6 The concentration is 2.5g / L, under this condition MnS 2 o 6 The decomposition rate reaches 68.8%. Under the same initial conditions, keeping δ-MnO in solution 2 The concentration of sulfuric acid remains unchanged, continue to increase the concentration of sulfuric acid in the solution to 0.6mol / L, react in a constant temperature water bath at 90°C for about 3 hours, then filter, and...

Embodiment 3

[0037] The leaching solution is the leaching solution obtained from manganese ore pulp flue gas desulfurization reaction, and the MnS in the leaching solution 2 o 6 The concentration of sulfuric acid is 8g / L, and the molar concentration of sulfuric acid in the leaching solution is about 0.013mol / L (pH is about 1.6). Add sulfuric acid and δ-MnO sequentially under the condition of mechanical stirring 2 To sulfuric acid concentration of about 0.4mol / L, δ-MnO 2 The concentration of ferric ion is 50g / L, and ferric iron is added at the same time until the concentration of ferric ion is about 2g / L. After reacting at 90°C for about 3 hours, MnS in the filtrate 2 o 6 The concentration is 1.5g / L, under this condition MnS 2 o 6 The decomposition rate reaches 81.3%. Increase the concentration of ferric ions in the solution to about 4g / L, and the MnS in the filtrate after reacting for about 3 hours 2 o 6 The concentration is 0.8g / L, under this condition MnS 2 o 6 The decompositio...

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Abstract

The invention discloses an efficient decomposition method for manganous dithionate in manganese ore sulfur dioxide lixivium. The method comprises the main steps that under the temperature condition ofthe sulfur dioxide lixivium of manganese ore pulp, sulfuric acid, manganese dioxide (or manganese bioxide ore) and ferric iron are sequentially added into the lixivium, and under the constant-temperature and acid conditions, through the catalytic activity of high-valent metal of ferric iron and manganese bioxide and the chain reaction process formed by coordination catalysis reduction and free radical oxidation formed by ferric iron and manganese bioxide, rapid oxidization conversion from sulfur dioxide to sulfate radicals is achieved. The process method has the advantages that cost is low, and large-scale industrialization production is easy. Manganese sulfate of main components in the lixivium serves as reaction products, no new impurity is introduced, and the lixivium can be used for producing electrolytic manganese metal or manganese sulfate easily later.

Description

technical field [0001] The invention belongs to the technical fields of pollution control and resource utilization, and hydrometallurgy, and specifically relates to a method for efficiently decomposing manganese dithionite in a leaching solution of manganese ore using sulfur dioxide as a leaching agent. Background technique [0002] Sulfur dioxide (SO 2 ) is a common air pollutant, which has a serious impact on human health and the environment, not only causing respiratory, cardiovascular and other diseases, but also causing acid rain and building corrosion. At present, the commonly used flue gas sulfur dioxide emission control technologies mainly include dry method, wet method and semi-dry method. However, for high concentrations of flue gas sulfur dioxide, these technologies can no longer meet the requirements, and are prone to secondary pollution, and the cost of desulfurization is high. In order to overcome the shortcomings of these technologies, people have developed a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B47/00
CPCC22B3/44C22B47/00
Inventor 杨林蒋文举辛广智
Owner SICHUAN UNIV
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