Method for high-purity manganese sulfate monohydrate
A technology of manganese sulfate and pure one, applied in the field of preparation of high-purity manganese sulfate monohydrate, can solve the problems of high cost of raw materials and many metal impurities, and achieve the effect of less impurities and stable quality
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Embodiment approach 1
[0025] A. Mix 1,000 grams of electrolytic manganese dioxide tail powder and 2 L of deionized water evenly, add 600 ml of concentrated sulfuric acid to stir and react, and separate solid and liquid; this step removes most of the impurities such as sulfates, carbonates, and sulfides.
[0026] B. Add 1800ml of 30% hydrogen peroxide and an appropriate amount of sulfuric acid to the solid isolate obtained in step A, keep the pH=3, and stir and react at normal temperature for 2 hours.
[0027] C. Gradually add barium hydroxide solution to the solution in step B, and keep stirring until PH = 5.4, then the solid-liquid separation.
[0028] D. According to the Pb content measured in the solution obtained by the solid-liquid separation in step C, add barium sulfide solution with a molar ratio of 2 times, stir evenly, heat to 60-80°C, and separate the solid and liquid.
[0029]
[0030] E. Add the solution obtained from solid-liquid separation in step D into coconut shell activated carb...
Embodiment approach 2
[0035] The difference from Embodiment 1 is that in step B, the pH is kept at 3.5, and the reaction is stirred at room temperature for 4 hours.
Embodiment approach 3
[0037] The difference from Embodiments 1 and 2 is that in step B, the pH is kept at 3, and the reaction is stirred at room temperature for 3 hours.
[0038] The various impurity contents that measure after the dried manganese sulfate monohydrate of above each embodiment gained are as following table:
[0039]
[0040] Note: The unit of the data in the table is ppm
[0041] It can be seen from the above table that the impurity content of the high-purity manganese sulfate products obtained in each embodiment of the present invention is relatively low, which can fully meet the needs of lithium battery positive electrode materials.
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