Method for preparing cerium phosphate by utilizing tetravalent cerium-containing waste liquid

A cerium phosphate and waste liquid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low cerium recovery rate and low cerium recovery efficiency, and achieve improved reduction efficiency and obvious environmental friendliness. , the effect of increasing the probability of contact

Active Publication Date: 2020-05-29
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Method for preparing cerium phosphate by utilizing tetravalent cerium-containing waste liquid
  • Method for preparing cerium phosphate by utilizing tetravalent cerium-containing waste liquid
  • Method for preparing cerium phosphate by utilizing tetravalent cerium-containing waste liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 persulfate radical and acetic acid molar ratio influence on cerium recovery rate and cerium phosphate yield rate

[0020] The method for preparing cerium phosphate by using tetravalent cerium-containing waste liquid: according to the molar ratio of persulfate and acetic acid 0.1:1, 0.15:1, 0.18:1, 0.2:1, 0.4:1, 0.6:1, 0.62:1, 0.65 :1, 0.7:1 Weigh sodium peroxodisulfate and acetic acid respectively, mix, stir until sodium peroxodisulfate is completely dissolved, and obtain nine groups of reduction preparation solutions. Mix the tetravalent cerium-containing waste liquid with the nine groups of reduction preparation solutions at a volume ratio of 1:2 to obtain nine groups of cerium-to-be-reduced solutions, wherein the concentration of tetravalent cerium in the tetravalent cerium-containing waste liquid is 0.05M. Add 0.1M phosphoric acid to the nine groups of cerium phosphates to be reduced respectively, stir thoroughly, heat at 70°C for 5 minutes, cool, separ...

Embodiment 2

[0027] The influence of concentration of tetravalent cerium on cerium recovery rate and cerium phosphate yield in embodiment 2 waste liquid

[0028] The method for preparing cerium phosphate by using tetravalent cerium-containing waste liquid: Weigh sodium peroxodisulfate and acetic acid according to the molar ratio of persulfate to acetic acid 0.6:1, mix and stir until sodium peroxodisulfate is completely dissolved to obtain a reduction preparation solution. Mix nine groups of tetravalent cerium-containing waste liquids with nine groups of reduction preparation solutions at a volume ratio of 1:2.5 to obtain nine groups of cerium-to-be-reduced solutions, of which the concentrations of tetravalent cerium in the nine groups of tetravalent cerium-containing waste liquids are respectively 0.025M , 0.035M, 0.045M, 0.05M, 0.1M, 0.15M, 0.155M, 0.165M, 0.175M. Add 0.2M phosphoric acid to the nine groups of cerium phosphates to be reduced respectively, stir well, heat at 85°C for 10 mi...

Embodiment 3

[0033] Embodiment 3 phosphoric acid concentration affects cerium recovery rate and cerium phosphate yield rate

[0034]The method for preparing cerium phosphate by using tetravalent cerium-containing waste liquid: Weigh sodium peroxodisulfate and acetic acid according to the molar ratio of persulfate to acetic acid 0.6:1, mix and stir until sodium peroxodisulfate is completely dissolved to obtain a reduction preparation solution. Mix the tetravalent cerium-containing waste liquid with the reduction preparation solution at a volume ratio of 1:3 to obtain the cerium-to-be-reduced liquid, wherein the tetravalent cerium concentration in the tetravalent cerium-containing waste liquid is 0.15M. Add 0.05M, 0.07M, 0.09M, 0.1M, 0.2M, 0.3M, 0.31M, 0.33M, 0.35M phosphoric acid into the nine groups of cerium to be reduced, stir well, heat at 100°C for 15 minutes, cool , solid-liquid separation, and vacuum drying to obtain nine groups of cerium phosphate.

[0035] The detection of cerium ...

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Abstract

The invention discloses a method for preparing cerium phosphate by using tetravalent cerium-containing waste liquid, which comprises the following steps: 1) respectively weighing sodium persulfate andacetic acid, mixing, and stirring until the sodium persulfate is completely dissolved to obtain a reduction preparation solution; 2) mixing the tetravalent cerium-containing waste liquid with the reduction preparation liquid to obtain a cerium to-be-reduced liquid; and 3) adding phosphoric acid into the cerium to-be-reduced solution, fully stirring, heating, cooling, carrying out solid-liquid separation, and carrying out vacuum drying to obtain cerium phosphate. According to the method, the tetravalent cerium-containing waste liquid can be efficiently treated, the cerium recovery rate is as high as 99%, and the cerium phosphate yield is as high as 98%. Meanwhile, cerium phosphate is obtained in the process of treating the tetravalent cerium-containing waste liquid by applying the method,the generated waste liquid only contains sodium sulfate and sodium carbonate, the environmental friendliness is obvious, and secondary treatment is not needed.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
CPCC01B25/37
Inventor 黄涛刘万辉金俊勋宋东平刘龙飞张树文徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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