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

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...

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