Method for purifying manganese sulfate in magnesium-rich manganese sulfate solution

A technology of magnesium-rich manganese sulfate solution and magnesium-rich manganese sulfate, applied in the direction of manganese sulfate, etc., to achieve the effect of simple process and low production cost

Pending Publication Date: 2020-05-19
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a kind of method for purifying manganese sulfate in magnesium-rich manganese sulfate solution, to solve the method problem of crystallization and separation of manganese sulfate from the magnesium-rich manganese sulfate solution with manganese-magnesium mass ratio lower than 5 in the prior art

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] First prepare the magnesium-rich manganese sulfate solution, and measure the Mn 2+ Concentration: 90g / L, Mg 2+ The concentration is 70g / L, Ca 2+ The concentration is 0.3g / L. Heat the above-mentioned magnesium-rich manganese sulfate solution at a temperature of 160°C to carry out the first high-temperature crystallization, and stir at a stirring speed of 30r / min to obtain a system after the primary crystallization, and carry out the system after the primary crystallization at a temperature of 155°C Filter to obtain crystals after primary crystallization.

[0034] Dissolve the crystals after primary crystallization in water to obtain the dissolved system, and measure the Mn 2+ The concentration is: 78g / L, Mg 2 + The concentration is 21g / L, and the dissolved system is heated at 140°C for the second high-temperature crystallization, and stirred at a stirring speed of 30r / min to obtain the secondary crystallized system, and the secondary crystallized system is obtained ...

Embodiment 2

[0036] The difference between embodiment 2 and embodiment 1 is that in the magnesium-rich manganese sulfate solution, Mn 2+ Concentration: 80g / L, Mg 2+ The concentration is 80g / L, Ca 2+ The concentration is 0.1g / L, and the mass ratio of manganese to magnesium in crystals after secondary crystallization is calculated to be 9.87.

Embodiment 3

[0038] The difference between embodiment 3 and embodiment 1 is that in the magnesium-rich manganese sulfate solution, Mn 2+ Concentration: 130g / L, Mg 2+ The concentration is 50g / L, Ca 2+ The concentration is 0.5g / L, and the mass ratio of manganese to magnesium in crystals after secondary crystallization is calculated to be 15.78.

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Abstract

The invention provides a method for purifying manganese sulfate in a magnesium-rich manganese sulfate solution. The purification method comprises the following steps: S1, performing primary high-temperature crystallization on a magnesium-rich manganese sulfate solution to obtain primary crystallized crystals; and S2, carrying out secondary high-temperature crystallization on the primary crystallized crystal to obtain a secondary crystallized crystal. The smaller the mass ratio of manganese to magnesium in the manganese sulfate solution is, the more difficult the manganese and the magnesium areseparated, and when the temperature is higher than 100 DEG C, the solubility of manganese sulfate is negatively related to the temperature. Most magnesium in the manganese sulfate solution with the mass ratio of manganese to magnesium being lower than 5 is removed through a high-temperature crystallization method, so that the method for purification of the magnesium-rich manganese sulfate solution is simple in process and low in production cost.

Description

technical field [0001] The invention relates to the technical field of purification of manganese-containing sulfuric acid, in particular to a method for purifying manganese sulfate in a magnesium-rich manganese sulfate solution. Background technique [0002] In recent years, with the continuous progress of my country's electronic chemical industry (such as electrolytic manganese, chemical manganese dioxide, magnetic manganese tetraoxide and other electronic chemicals with high quality requirements and high purity), as these high-standard electronic chemicals The quality of manganese sulfate, which is the raw material for production, has also attracted much attention. Manganese sulfate products produced in industry generally contain Ca 2 + , Mg 2+ Plasma, Ca 2+ , Mg 2+ Seriously affected the ex-factory quality of manganese sulfate product to a certain extent. Given the Ca contained in the manganese sulfate solution 2+ , Mg 2+ Impurities and Mn 2+ The chemical properti...

Claims

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Application Information

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IPC IPC(8): C01G45/10
CPCC01G45/10
Inventor 曹敏孙宁磊刘苏宁彭建华刘国
Owner CHINA ENFI ENGINEERING CORPORATION
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