Method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching liquid

A high-purity manganese phosphate and rhodochrosite technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high content, low electrolysis efficiency, environmental threats, etc., and achieve high purity, low impurity content, and high efficiency. separation effect

Active Publication Date: 2017-02-08
UNIV OF SCI & TECH BEIJING
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  • Application Information

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Problems solved by technology

However, the grade of rhodochrosite raw ore is reduced, the types of impurities are complex, the content is high, the electrolysis efficiency is low, the cost remains high, and the electrolysis waste liquid contains a large amount of heavy metal ions, which poses a serious threat to the environment.

Method used

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  • Method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching liquid
  • Method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0015] The sulfuric acid leaching solution concentration of rhodochrosite is 100g / L, measures the leaching solution of 25ml and is placed in reaction vessel, adds the sodium phosphate solution that concentration is 20g / L, until the pH of solution in reaction vessel is about 3.5, magnetic stirring 1h, filter, Obtain primary manganese sulfate solution; continue to add sodium phosphate solution with a concentration of 20g / L, control the pH of the solution to about 4.0, stir magnetically at 25°C for 2 hours, filter, wash, and dry to obtain manganese phosphate.

[0016] The total content of impurities in the obtained manganese phosphate is less than 0.05%, wherein the content of iron is less than 0.04%, the content of aluminum is less than 0.01%, the content of heavy metals is less than 0.01%, and the content of calcium and magnesium is less than 0.01%.

[0017] figure 1 It is the XRD spectrum of the synthesized high-purity manganese phosphate, no obvious impurity diffraction peaks...

Embodiment 2

[0019] The concentration of the sulfuric acid leaching solution of rhodochrosite is 80g / L, measure the leaching solution of 25ml and be placed in the reaction vessel, add the sodium phosphate solution that concentration is 15g / L, until the pH of solution in the reaction vessel is about 3.0, magnetic stirring 1h, filter, Obtain primary manganese sulfate solution; continue to add sodium phosphate solution with a concentration of 15g / L, control the pH of the solution to about 4.5, stir magnetically at 70°C for 2 hours, filter, wash, and dry to obtain manganese phosphate.

[0020] figure 2 It is a column chart comparing the ICP analysis results of the synthesized high-purity manganese phosphate and the impurity content of the rhodochrosite leach solution. The total content of impurities in the manganese phosphate synthesized by the inventive method is 0.048%, less than 0.05%; wherein the content of impurity iron is 0.034%, less than 0.04%; and the contents of aluminum, calcium, m...

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Abstract

The invention discloses a method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching liquid and belongs to the hydrometallurgy field. The impurity content of the low-grade rhodochrosite leaching liquid is high, the technical difficulty of impurity removal is high, and the process is complicated. The method for preparing the high-purity manganese phosphate from the low-grade rhodochrosite leaching liquid is short in technological process and mainly includes the following two steps that firstly, sodium phosphate is added into sulfuric acid leaching liquid of rhodochrosite, the pH value of a solution is controlled between 3 and 3.5, sufficient stirring is performed, precipitate is removed in a filtering manner, and a preliminarily purified manganese sulfate solution is obtained; and secondly, sodium phosphate continues to be added into the preliminarily purified manganese sulfate solution, a final pH value of the solution is controlled between 4.0 and 4.5, sufficient stirring is performed, filtering and repeated washing are performed, and a high-purity manganese phosphate product is obtained. The method is simple in process operation and easy to control, the prepared manganese phosphate is high in purity, feasibility of evaluation in the aspects of economy, technology, environment and the like is high, and a new path is provided for development and application of the low-grade rhodochrosite.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, and in particular provides a method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching solution. Background technique [0002] my country's manganese ore reserves are abundant, but the grade is generally low. At present, the average grade of rhodochrosite is lower than 14%, which is far lower than the international standard of manganese-rich ore. The traditional metallurgical industry mainly uses electrolytic manganese technology to produce electrolytic manganese and electrolytic manganese dioxide products, and use them as raw materials for other high-purity manganese products for production and application. However, the grade of rhodochrosite raw ore is reduced, the types of impurities are complex, the content is high, the electrolysis efficiency is low, the cost remains high, and the electrolysis waste liquid contains a large amount of heavy metal ions, which pose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C01B25/37
CPCC01B25/377C22B3/44
Inventor 连芳毛磊马来君陈李泽方
Owner UNIV OF SCI & TECH BEIJING
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