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A kind of method for preparing rhodochrosite type manganese phosphate from low-grade rhodochrosite leaching solution

A red manganese ore type and leaching solution technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high pollution process, long process flow, high efficiency, etc., and achieve short process flow, low impurity content, and purity. high effect

Active Publication Date: 2019-05-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the idea of ​​chemical coupling and integrated process design, high-purity rhodochrosite-type manganese phosphate is prepared from low-grade rhodochrosite leaching solution with high impurity content, so as to solve the high energy consumption, high pollution and process problems caused by traditional high-purity manganese products using electrolytic products as raw materials. Complicated and long-process problems, to achieve low-grade manganese resources short-process, high efficiency, low investment, without using toxic and easily polluting agents, and environmentally friendly technological innovation for the production of high-purity manganese products

Method used

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  • A kind of method for preparing rhodochrosite type manganese phosphate from low-grade rhodochrosite leaching solution
  • A kind of method for preparing rhodochrosite type manganese phosphate from low-grade rhodochrosite leaching solution
  • A kind of method for preparing rhodochrosite type manganese phosphate from low-grade rhodochrosite leaching solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Measure 25ml of rhodochrosite leaching solution into a reaction vessel, add an appropriate amount of barium hydroxide octahydrate solid powder with a content ≥98% and pass through a 100 mesh sieve, control the pH of the solution to about 4.0, stir magnetically for 3 hours, and filter. Obtain primary manganese sulfate solution;

[0016] (2) By adding distilled water to the primary manganese sulfate solution or controlling the solvent volatilization of the primary manganese sulfate solution, adjust the concentration of the primary manganese sulfate solution to 80g / L, and then add ammonium dihydrogen phosphate with a concentration of 15g / L dropwise to it to The pH of the solution was about 4.5, stirred magnetically at 85°C for 8 hours, filtered, washed, and dried to obtain manganese-type manganese phosphate.

[0017] figure 1 It is the XRD spectrum of the synthesized jamenite-type manganese phosphate and the standard card. From the figure, it can be seen that the diff...

Embodiment 2

[0019] (1) Measure 25ml of rhodochrosite leaching solution into a reaction vessel, add an appropriate amount of barium hydroxide octahydrate solid powder with a content ≥98% and pass through a 120 mesh sieve, control the pH of the solution to about 3.5, stir magnetically for 3 hours, and filter. Obtain primary manganese sulfate solution;

[0020] (2) Adjust the concentration of the primary manganese sulfate solution to 100g / L, then add ammonium dihydrogen phosphate with a concentration of 20g / L dropwise to the solution until the pH of the solution is about 4.0, stir magnetically at 90°C for 12h, filter, wash, and dry , to obtain the manganese phosphate manganese phosphate.

[0021] figure 2 It is a column chart comparing the XRF analysis results of the synthesized pyrosite-type manganese phosphate with the impurity content of the rhodochrosite leach solution. The content of impurity iron in the pyrosite-type manganese phosphate is 0.0029%, which is lower than 0.003%; the con...

Embodiment 3

[0023] (1) Measure 25ml of rhodochrosite leaching solution into a reaction vessel, add an appropriate amount of barium hydroxide octahydrate solid powder with a content ≥98% and pass through a 110 mesh sieve, control the pH of the solution to about 3.5, stir magnetically for 3 hours, and filter. Obtain primary manganese sulfate solution;

[0024] (2) Adjust the concentration of the primary manganese sulfate solution to 60g / L, then add ammonium dihydrogen phosphate with a concentration of 10g / L dropwise to the solution until the pH of the solution is about 4.5, stir magnetically at 95°C for 6h, filter, wash, and dry , to obtain the manganese phosphate manganese phosphate.

[0025] image 3 It is the SEM picture of the synthesized photonite-type manganese phosphate, and it can be seen from the figure that the experimentally synthesized phoenixite-type manganese phosphate is a uniform prism.

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Abstract

The invention discloses a method for preparing manganwentzelite type manganese phosphate from low grade rhodochrosite leachate. Manganwentzelite is phosphate of first-class manganese, has the characteristics of high hardness, good thermal stability and good wear resistance, and is widely used as a high-performance preservative. The low grade rhodochrosite leachate is high in impurity content, an impurity removal technical difficulty is high, and a production process for high-purity products is complicated. The method for preparing manganwentzelite type manganese phosphate from low grade rhodochrosite leachate mainly comprises the following steps: regulating the pH value of the low grade rhodochrosite leachate by using barium hydroxide, filtering to remove precipitate to obtain a primary purified manganese sulfate solution; and adding ammonium dihydrogen phosphate in the primary purified manganese sulfate solution, controlling the pH value of the solution, the reaction temperature and the reaction time, and repeatedly washing the phosphate to obtain a high-purity manganwentzelite product. The method is short in technological process, simple to operate and easy to controlled; batch production is facilitated; and the prepared product is high-purity prismatic manganwentzelite type manganese phosphate. A new way is provided for short-process development and application of low grade rhodochrosite and preparation of the high-purity manganwentzelite type manganese phosphate.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, and in particular provides a method for preparing rhodochrosite-type manganese phosphate from a low-grade rhodochrosite leaching solution. Background technique [0002] Phromanite is a kind of manganese phosphate, the chemical formula is [Mn 5 (HPO 4 ) 2 (PO 4 ) 2 (H 2 O)], has the characteristics of high hardness, good thermal stability and wear resistance, and is widely used as a high-performance preservative. Phromanite exists not only in rocks, but also in soil. Compared with the hydrothermal environment, the surface environment conditions are milder, and the mineral formation conditions are more complex. Therefore, simulating the formation of phosphomanite in a supergene environment has also aroused widespread interest. De Amorim H S et al. (De Amorim H S, Amaral M R Do Jr, Moreira L, et al. Journal of Materials Science Letters, 1996, 15: 1895-1897) used MnCl 2 with H 3 PO 4 Mix, adj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37
CPCC01B25/377C01P2002/72C01P2004/03C01P2006/80
Inventor 连芳陈李泽方马来君毛磊
Owner UNIV OF SCI & TECH BEIJING
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