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Method for removing heavy metals and radioactive elements in ionic type mixed rare earth material liquid

A radioactive element and mixed rare earth technology, applied in the field of hydrometallurgy, can solve the problems of large processing capacity and high pollution control cost, and achieve the effects of high removal rate, reduced impurity content, and reduced processing cost.

Inactive Publication Date: 2015-08-26
GANZHOU NONFERROUS METALLURGICAL RES INST
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  • Abstract
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Problems solved by technology

Therefore, the amount of treatment to remove heavy metals and radioactive elements from terminal sewage is extremely high, and the cost of pollution control is very high

Method used

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  • Method for removing heavy metals and radioactive elements in ionic type mixed rare earth material liquid
  • Method for removing heavy metals and radioactive elements in ionic type mixed rare earth material liquid

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Embodiment

[0045] Embodiment: Hydrochloric acid decomposes ion-type mixed rare earth feed liquid acidity 0.05~0.5mol / L, rare earth feed liquid concentration 0.8~1.6mol / L; Organic extraction agent ammonia-free saponification degree 0.05~0.5mol / L; Compared to (1~ 4): 1. The mixing time is 10-20 minutes, and the clarification time is 10-15 minutes; the number of extraction tanks is 20-40, and the volume of the mixing chamber of the extraction tank is 5L; the processing capacity of feed liquid is 75-85kg / d.

[0046] After removal of impurities, the concentration REO of the ionic mixed rare earth feed solution is 0.8~1.6mol / L, the total amount of radioactive elements thorium and uranium<0.5mg / L; heavy metal elements: total cadmium<0.25mg / L, total lead<1.0mg / L , total arsenic <0.5mg / L, total chromium <4.0mg / L, hexavalent chromium <0.5mg / L.

[0047] The discharge outlet of the impurity removal wastewater workshop meets the "Rare Earth Industrial Pollutant Discharge Standard": the total amount o...

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Abstract

The invention relates to a method for removing heavy metals and radioactive elements in ionic type mixed rare earth material liquid. The method is characterized by comprising the following steps: performing acid decomposition on ionic mixed rare earth to form the ionic mixed rare earth material liquid; performing extraction and separation by using an ammonia-free saponified organic extracting agent and the ionic mixed rare earth material liquid, wherein the heavy metals and the radioactive elements are extracted into an organic phase, and the rare earth material liquid after impurity removal is in a water phase; performing back extraction on a loaded organic phase, so that the heavy metals, the radioactive element and other impurities in the loaded organic phase and a small quantity of extracted rare earth are all subjected to back extraction; removing the heavy metals and the radioactive elements in back extraction liquid by adding a heavy metal, uranium and thorium removing agent, so that wastewater after impurity removal reaches the standard to be discharged. According to the method provided by the invention, the contents of the heavy metals and the radioactive elements are reduced from a source, so that the follow-up sewage heavy metal and radioactive element treatment procedures are omitted, the sewage treatment cost is reduced, and meanwhile, sewage is discharged after reaching the standard.

Description

technical field [0001] The invention relates to a method and system for removing heavy metals and radioactive elements in an ionic mixed rare earth feed liquid, which is used to treat the southern ionic mixed rare earth feed liquid, and is a new type of removal of heavy metals and radioactive elements (such as thorium, uranium) The method belongs to the field of hydrometallurgy. [0002] The term "ammonia-free saponification organic extractant" refers to the use of one or more of "sodium carbonate, sodium bicarbonate, calcium oxide, sodium hydroxide, magnesium oxide" to replace the traditional "ammonia" saponification organic phase, forming an organic Extracting agent. The term "heavy metal, radioactive (thorium, uranium) remover" refers to one or more of ferrous sulfate, ferrous chloride, sodium sulfide, lime, and flocculant PAM. Background technique [0003] In the prior art, the preparation process of ionic mixed rare earth feed liquid includes: dissolving with hydrochl...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/26C22B3/02
Inventor 张选旭陈冬英杨新华陈淑梅周洁英洪侃伍莺赖兰萍陈后兴赖耀斌
Owner GANZHOU NONFERROUS METALLURGICAL RES INST
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