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Method for removing manganous dithionate in pyrolusite slurry leaching solution to prepare saturated manganese sulfate slurry and manganese sulfate

A technology of manganese dithionate and manganese sulfate, which is applied in the direction of manganese sulfate, etc., can solve the problems of increasing the cost of chemicals, increasing the difficulty of purification and impurity removal, and high concentration of sulfuric acid, so as to achieve high resource utilization, cost reduction, and simple process flow easy-to-use effects

Active Publication Date: 2017-12-08
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of method fundamentally removes manganese dithionate, which can greatly improve the quality of manganese sulfate products, but the concentration of sulfuric acid required for the decomposition of manganese dithionate is relatively large
Chen Jianwei's research results show that under the conditions of 200ml manganese dithionate solution and 20ml sulfuric acid addition, although the conversion rate of manganese dithionate reaches over 91%, the residual sulfuric acid concentration in the solution reaches over 1.5mol / L , such a high concentration of sulfuric acid will not only increase the cost of chemicals, but also increase the difficulty of subsequent purification and removal of impurities

Method used

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  • Method for removing manganous dithionate in pyrolusite slurry leaching solution to prepare saturated manganese sulfate slurry and manganese sulfate
  • Method for removing manganous dithionate in pyrolusite slurry leaching solution to prepare saturated manganese sulfate slurry and manganese sulfate

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Effect test

Embodiment 1

[0043] (1) Pulp preparation: Prepare pyrolusite slurry according to the ratio of pyrolusite and water at a ratio of 1:3.

[0044] (2) Leaching: Utilize sulfur dioxide to react with the pyrolusite slurry obtained in step (1), leach the manganese in the pyrolusite, obtain the slurry containing the pyrolus slag and the leachate, and press filter the slurry to obtain the pyrololus slag and the separating liquid;

[0045] (3) Purification and impurity removal: continuously blow air into the separation liquid obtained in step (2), so that ferrous sulfate is oxidized to ferric sulfate, and calcium hydroxide is added to adjust the pH to 5, so that iron and aluminum in the solution are formed Ferric hydroxide and aluminum hydroxide are precipitated, and after pressure filtration, neutralization slag and separation liquid are obtained; sodium sulfide is added to the separation liquid to cause heavy metal impurities to form sulfide precipitation, and after static precipitation and filtrat...

Embodiment 2

[0053] (1) Pulp preparation: prepare pyrolusite slurry according to the ratio of pyrolusite and water at a ratio of 1:2.

[0054] (2) leaching: utilize sulfur dioxide to react with the pyrolusite slurry gained in step (1), leach the manganese in the pyrolusite, obtain the slurry containing the pyrolus slag and the leachate, and centrifuge the slurry to obtain the pyrololus slag and the separating liquid;

[0055] (3) Purification and impurity removal: add hydrogen peroxide to the separation liquid obtained in step (2) to oxidize ferrous sulfate to ferric sulfate, and add ammonia to adjust the pH to 5.5, so that iron and aluminum in the solution generate ferric hydroxide Precipitate with aluminum hydroxide, and obtain neutralization slag and separation liquid after pressure filtration; add sodium thiram to the separation liquid to form sulfide precipitation from heavy metal impurities, and obtain sulfide slag and manganese dithionite containing manganese sulfate and manganese di...

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Abstract

The invention provides a method for removing manganous dithionate in a pyrolusite slurry leaching solution to prepare saturated manganese sulfate slurry and manganese sulfate. The method comprises the following steps: performing solid-liquid separation to obtain pyrolusite slag and a separated solution containing manganese sulfate and manganous dithionate; performing neutral oxidation on the separated solution to remove iron and aluminum; vulcanizing to remove heavy metal; heating an obtained mixed solution of manganese sulfate and manganous dithionate to evaporate and concentrate to obtain a crystal-containing saturated solution; adding sulfuric acid or a saturated manganese sulfate solution containing sulfuric acid to decompose manganous dithionate into manganese sulfate and sulfur dioxide; discharging mixed gas of sulfur dioxide and water vapor to obtain the saturated manganese sulfate slurry without the manganous dithionate. The invention also provides a method for preparing manganese sulfate through the saturated manganese sulfate slurry prepared by the method. The method is low in cost, easy to operate, and capable of removing manganous dithionate in the leaching solution without additional subsequent purifying process, and high-level manganese sulfate product is prepared.

Description

technical field [0001] The invention belongs to the production technical field of manganese sulfate products, and in particular relates to a method for preparing saturated manganese sulfate slurry and manganese sulfate by removing manganese dithionite in pyrolusite pulp leaching liquid. Background technique [0002] Manganese sulfate is an important chemical product widely used in paint industry, agriculture and food industry. Manganese sulfate is also the most important basic manganese salt in manganese series products, and more than 80% of manganese series products are produced through manganese sulfate. At present, the preparation of manganese sulfate mainly includes three stages: leaching of manganese ore, purification and removal of impurities of leachate, and crystallization of manganese sulfate solution. Pyrolulusite is one of the main manganese ores for manganese sulfate production. The average grade of pyrolusite in China is only 22%. The traditional reduction roa...

Claims

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Application Information

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IPC IPC(8): C01G45/10
CPCC01G45/10
Inventor 孙维义苏仕军丁桑岚
Owner SICHUAN UNIV
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