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A method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching solution

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

Active Publication Date: 2018-04-13
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • 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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  • A method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching solution
  • A method for preparing high-purity manganese phosphate from low-grade rhodochrosite leaching solution

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Effect test

Embodiment 1

[0015] The concentration of the sulfuric acid leaching solution of rhodochrosite is 100g / L. Measure 25ml of the leaching solution and place it in the reaction vessel. Add sodium phosphate solution with a concentration of 20g / L until the pH of the solution in the reaction vessel is about 3.5. Magnetically stir for 1 hour and filter. Obtain a primary manganese sulfate solution; continue to add a sodium phosphate solution with a concentration of 20 g / L, control the pH of the solution to about 4.0, magnetically stir 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%, of which 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%; the content of calcium and magnesium is less than 0.01%.

[0017] figure 1 It is the XRD pattern of the synthesized high-purity manganese phosphate, and no obvious i...

Embodiment 2

[0019] The concentration of the sulfuric acid leaching solution of Rhodochrosite is 80g / L. Measure 25ml of the leaching solution and place it in the reaction vessel. Add 15g / L sodium phosphate solution until the pH of the solution in the reaction vessel is about 3.0. Magnetically stir for 1h and filter. Obtain a primary manganese sulfate solution; continue to add a sodium phosphate solution with a concentration of 15 g / 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 bar graph comparing the ICP analysis results of the synthesized high-purity manganese phosphate and the impurity content of the rhodochrosite leaching solution. The total impurity content in manganese phosphate synthesized by the method of the present invention is 0.048%, which is less than 0.05%; the content of impurity iron is 0.034%, which is less than 0.04%; and the content 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 a low-grade rhodochrosite leaching solution. Background technique [0002] my country's manganese ore resources are abundant, but the grade is generally low. The current average grade of rhodochrosite is lower than 14%, which is far below the international standard for rich manganese ore. The traditional metallurgical industry mainly uses electrolytic manganese technology to produce electrolytic manganese and electrolytic manganese dioxide products, and use this as a raw material for other high-purity manganese products for production and application. However, the grade of the raw ore of rhodochrosite is reduced, the types of impurities are complex, the content is high, the electrolysis efficiency is low, the cost remains high, and the electrolyte waste contains a large amount of heavy metal ions, which poses a seriou...

Claims

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Application Information

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Patent Type & Authority Patents(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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