A method for preparing cerium phosphate by utilizing waste liquid containing tetravalent cerium

Abstract

The invention discloses a method for preparing cerium phosphate by using tetravalent cerium-containing waste liquid, comprising the following steps: 1) Weighing sodium peroxodisulfate and acetic acid respectively, mixing and stirring until the sodium peroxodisulfate is completely dissolved to obtain a reduction preparation solution ; 2) Mix the tetravalent cerium-containing waste liquid with the reduction preparation solution to obtain the cerium to be reduced solution; 3) Add phosphoric acid to the cerium to be reduced solution, stir fully, heat and cool, separate solid and liquid, and vacuum dry to obtain phosphoric acid cerium. The method of the invention can efficiently dispose waste liquid containing tetravalent cerium, the recovery rate of cerium is as high as 99%, and the yield of cerium phosphate is as high as 98%. At the same time, in the process of applying the method of the present invention to dispose of tetravalent cerium-containing waste liquid, not only cerium phosphate is obtained, but the generated waste liquid only contains sodium sulfate and sodium carbonate, which has obvious environmental friendliness and does not need secondary disposal.

Description

technical field [0001] The invention relates to the field of disposal of polluted water bodies, in particular to a method for preparing cerium phosphate from waste liquid containing tetravalent cerium. Background technique [0002] There are two main sources of tetravalent cerium in the waste liquid, one is leaching from rare earth-bearing rocks and mines by rainwater, and the other is the discharge of cerium-containing industrial wastewater and the seepage of tail water from rare earth mining areas caused by human activities. . Since tetravalent cerium contains unfilled 4f electrons, most cerium in water exists as ionic compounds. Excessive concentration of tetravalent cerium in water will inhibit the growth of aquatic plants and crops. Soluble cerium in water can also affect human health through plant absorption-food chain biotransport. Traditionally, tetravalent cerium in water is usually converted to trivalent and then recovered. Tetravalent cerium mainly exists in t...

AI Technical Summary

Problems solved by technology

Therefore, when traditional reducing agents are used to treat tetravalent cerium in water, it is difficult for the reducing agent to directly contact tetravalent cerium, resulting in low final cerium recovery efficiency.

At the same time, when the reducing agent is introduced into the cerium-containing waste liquid, many impurities thereof will be brought in, resulting in a low yield of cerium recovery.

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