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Rare earth extraction saponification waste-water cyclic utilization method

A saponification wastewater and rare earth technology, which is applied in chemical instruments and methods, separation methods, metallurgical wastewater treatment, etc., can solve the problems of rare earth extraction and saponification wastewater pollution, and achieve the effects of improving pollution control level, reducing production costs, and reducing environmental pollution

Active Publication Date: 2009-10-07
CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of rare earth extraction saponification wastewater recycling method that can solve the pollution problem of rare earth extraction saponification wastewater, realize the recycling of valuable elements, eliminate saponification wastewater, low production cost, and less energy consumption

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  • Rare earth extraction saponification waste-water cyclic utilization method

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Embodiment 2

[0018] The present invention uses P 204 Acidic extractant for extraction and separation, P 204 With kerosene as diluent, by weight percentage P 204 : kerosene=1: 1.5-1, P204 concentration after dilution is 1.1-1.5mol / l, adding concentration is 4-8mol / l NaOH solution, the concentration that 1.00-1.70mol / l rare earth material liquid saponification produces is 1.65-2.00mol / l Sodium chloride wastewater is degreased and purified by the cyclone oil-water separator, the wastewater is concentrated to a concentration of 4.96mol / l by a three-effect falling film evaporator, and the concentration is 5.13mol / l after adding raw salt, and the primary brine is passed through a water distribution tank Add 0.40-1.50mol / l Na 2 SO 3 Remove free Cl - , then add 0.25-0.60mol / lBaCl 2 , 0.45-1.20mol / l Na 2 CO 3 , after filtering through Kai membrane filter, the concentration of secondary brine NaCl is 5.00-5.40mol / l, SS≤1ppm, NaOH concentration (3.75-6.25)×10 -3 mol / l, Na 2 CO 3 Concentrat...

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Abstract

The invention relates to a rare earth extraction saponification waste-water cyclic utilization method, belonging to the rare earth wet-process metallurgy field. The method comprises the following steps: concentrating the saponification waste water after adding crude salt, adding Na2SO3, BaCl2, Na2CO3 and removing impurities through a water distribution tank, refining the filtered secondary salt water by an ion exchange resin tower, Ca2+, Mg2+ ion <=20ppb; producing hydrochloric acid and liquid alkali using ion membrane electrolytic process wherein the hydrochloric acid and liquid alkali back to the rare earth technique. The treatment of the sodium chloride waste water realizes the cyclic utilization of the valuable element with features of source saving, product cost reducing, environmental pollution reducing. The method is an economic and an environmental friendly production method of rare earth extraction separation cyclic utilization, which realizes the cyclic utilization of the rare earth extraction separation sodium chloride saponification waste-water.

Description

1. Technical field [0001] The invention relates to a recycling method for rare earth extraction and saponification wastewater, which belongs to the field of rare earth hydrometallurgy. 2. Background technology [0002] In the rare earth hydrometallurgy process, the extraction method is the most mature method. The saponification agents used in the saponification process of the extraction agent mainly include ammonia water, sodium hydroxide, calcium oxide and magnesium oxide, etc. The saponification wastewater generated is mainly ammonium chloride wastewater, Sodium chloride waste water, calcium chloride waste water and magnesium chloride waste water etc., ammonium chloride waste water has direct evaporation method and alkaline ammonia distillation method, (patent: CN200310117823.4 and CN200410084484.9) sodium chloride waste water, calcium chloride waste water and Magnesium chloride wastewater adopts the direct evaporation method to recover salt, which has high recovery cost a...

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Application Information

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IPC IPC(8): C02F9/06C02F1/40C02F1/04C02F1/42C02F1/461C25B1/26C02F103/16
Inventor 王晓铁李冬王静赵治华邢志强郝高慧季力卢龙
Owner CHINA NORTHERN RARE EARTH (GROUP) HIGH TECH CO LTD
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