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
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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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