Study on Separation and Recycling of Fluorine by Solvent Extraction from Manganese Sulfate Solution AITranslate

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Chinese Library Classification Number:TF111[冶金工程—冶金物理化学]

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Removing calcium and magnesium by fluorine precipitation is the most common method to prepare high-purity manganese sulfate solution.However,the introduced fluorine needs a further removal.In this paper,a new technology is proposed to separate and recover fluorine from fluorine-containing manganese sulfate solution,mainly including the two processes of solvent extraction for fluorine and cyclic stripping of fluorine with manganese oxide.Under such conditions,including initial pH of 1.9 for manganese sulfate solution,organic phase composition of 60%TBP+40%sulfonated kerosene,O/A ratio of 2∶1,and extraction time of 3 min,the concentration of fluorine in manganese sulfate solution can be reduced to below 35 mg/L after a five-stage countercurrent extraction at room temperature.And under the optimal stripping conditions of manganese oxide addition of 1.0 times the theoretical amount,O/A ratio of 5∶1,stripping time of 1 h,and temperature of 298 K,the cyclic stripping efficiency of manganese oxide reaches above 98.08%,and the manganese fluoride precipitated in the stripping process can be used for the removal of calcium and magnesium in manganese sulfate solution in return.Compared with the existing fluorine stripping process,this new technology can realize the recycling of fluorine while removing fluorine in depth.