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Treatment system and treatment method for reducing content of impurities in soluble manganese sulfate solution

A treatment system and technology of impurity content, applied in the field of electrode material preparation, can solve problems such as low impurity removal rate

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

[0004] The main purpose of the present invention is to provide a treatment system and treatment method for reducing the impurity content in soluble manganese salt solution, so as to solve the problem of low impurity removal rate in existing soluble manganese salt treatment methods

Method used

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  • Treatment system and treatment method for reducing content of impurities in soluble manganese sulfate solution
  • Treatment system and treatment method for reducing content of impurities in soluble manganese sulfate solution
  • Treatment system and treatment method for reducing content of impurities in soluble manganese sulfate solution

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Embodiment 1

[0079] Manganese sulfate solution with Mn content of 50g / L, Mg content of 40g / L and Ca content of 0.5g / L was prepared, and the actual content of each ion in the manganese sulfate solution was determined by atomic absorption.

[0080] The organic phosphorus extractant is composed of P204 and sulfonated kerosene, wherein the volume content of P204 is 20%. Ammonia water and the above-mentioned organophosphorus extractant are used for saponification, and the saponification rate is 70%.

[0081] The pH of the manganese sulfate solution is adjusted to 3, and the volume ratio of the manganese sulfate solution and the organic phosphorus extractant is 1:1, and a multi-stage extraction process is carried out to obtain a manganese-rich organic phase, wherein the temperature of the extraction process is 25 ° C, and the extraction The time is 4min, and the phase separation time is 7min.

[0082] The volume ratio of the stripping agent (1mol / L sulfuric acid) to the manganese-rich organic p...

Embodiment 2

[0085] The difference with embodiment 1 is:

[0086] The pH of the soluble manganese salt solution was adjusted to 2 before carrying out the extraction process.

Embodiment 3

[0088] The difference from Example 1 is: before carrying out the extraction process, the pH of the soluble manganese salt solution was adjusted to 5.

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Abstract

The invention provides a treatment system and a treatment method for reducing the content of impurities in a soluble manganese salt solution. The impurities comprise calcium ions and magnesium ions, the treatment system comprises an extraction unit and an evaporative crystallization device or a precipitation unit, the extraction unit is used for removing the magnesium ions, and the extraction unitis provided with a soluble manganese salt solution inlet, an extraction agent inlet and a primary purified product outlet; the evaporative crystallization device is provided with a primary purified product inlet, and the primary purified product inlet is communicated with the primary purified product outlet through a primary purified product conveying pipeline; the precipitation unit is providedwith a primary purification product inlet and a precipitant inlet, and the primary purification product inlet is communicated with the primary purification product outlet through a primary purification product conveying pipeline. By adopting the treatment system, the impurity content in the soluble manganese salt solution can be greatly reduced. The treatment system and a treatment method for reducing the content of impurities in a soluble manganese salt solution have the advantages of being simple in structure, small in solid slag and hazardous waste discharge amount and the like, and therefore good environmental friendliness is achieved.

Description

technical field [0001] The invention relates to the field of electrode material preparation, in particular to a treatment system and a treatment method for reducing the impurity content in a soluble manganese salt solution. Background technique [0002] High-purity manganese sulfate, as one of the raw materials for the synthesis of lithium-nickel-cobalt-manganese-oxygen ternary positive electrode materials for batteries and lithium manganate positive electrode materials, has become a research hotspot in the current manganese industry. In recent years, the requirement for the purity of manganese sulfate has become higher and higher, while the removal of calcium and magnesium has always been a major problem in the production of high-purity manganese sulfate. At present, the impurity removal processes for soluble manganese salts mainly include chemical precipitation, physical adsorption, replacement, crystallization and solvent extraction. The solvent extraction method is wide...

Claims

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Application Information

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IPC IPC(8): C01G45/10
CPCC01G45/10C01G45/003C01P2006/80
Inventor 曹敏刘诚孙宁磊刘苏宁殷书岩
Owner CHINA ENFI ENGINEERING CORPORATION
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