Research on the Application of Reverse Osmosis to Concentrate Lithium Sulfate Solution
The experiment is based on the membrane concentration process scheme provided by Jiangsu Jiuwu High-tech Co.,Ltd.for a lithium battery enterprise,and verifies the feasibility of the scheme.The concentration of Li+ in lithium sulfate solution was increased to more than 12 g/L in the primary concentrated water section,and the concentration of Li+ in the secondary clear liquid was reduced to less than 5 mg/L through the combination of primary high pressure reverse osmosis and secondary atmospheric reverse osmosis.The imported membrane and the domestic membrane were compared in the high pressure first stage reverse osmosis,which provided the basis for the selection of the membrane,and introduced the cleaning method of the membrane and the precautions in the cleaning process.The two-stage atmospheric reverse osmosis membrane was filtered and concentrated using Jiuwu's own BW-4040F31 reverse osmosis membrane.The results show that under the same final concentration ratio of 6 times,the average flux of Li+=14.35 g/L,average flux of 31.25 L/(m2·h),the retention rate is 99.4%.The final concentrated liquid Li+=14.34 g/L has an average flux of 27.7 L/(m2·h)and the retention rate is 99.5%.After considering various factors,domestic film is selected for application in industrial field.The second stage reverse osmosis experiment was carried out with BWB-4040F31 reverse osmosis membrane.The final concentration was 10 times,the average flux was 98 L/(m2·h),and the final concentrated liquid Li+=1.16 g/L and the clear liquid Li+=3 mg/L.
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