Method for removing radium from south ionic rare earth leachate

A technology of ionic rare earth and ionic rare earth ore, which is applied in the direction of improving process efficiency, can solve the problems of unsatisfactory radium removal effect, and achieve the effects of improving radium removal effect, good separation effect and simple process

Active Publication Date: 2014-07-09
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current barium sulfate radium method is not very effective in removing radium from the southern ionic rare earth leachate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Southern ionic type rare earth leach solution, in which the concentration of rare earth ions is 1.7mol / L, the concentration of radium is 10Bq / L, and pH=3.0. Add iron filings to the rare earth leaching solution according to the mass ratio of iron filings: rare earth leaching solution 0.1:1000, stir and mix for 6 hours; add solid barium chloride to the above rare earth leaching solution according to the mass ratio of barium chloride: rare earth leaching solution 5:1000, stir and mix evenly Add 37%wt hydrogen peroxide according to the molar ratio of hydrogen peroxide: iron filings 10:1, after stirring for 1 hour, add 50ppm of 1%wt polyacrylamide solution, let it stand for clarification, suck out the clear liquid, filter, and precipitate In order to remove radium slag, the clear liquid is the rare earth leaching solution after radium removal, and the concentration of radium in it is 0.055Bq / L as measured by analysis.

Embodiment 2

[0013] Nanfang ionic rare earth leach solution, in which the concentration of rare earth ions is 1.2mol / L, the concentration of radium is 30Bq / L, and pH=4.0. Add ferrous sulfate to the rare earth leaching solution by ferrous sulfate: rare earth leaching solution mass ratio 0.2: 1000, stir and mix for 0.5 hour; press barium chloride: rare earth leaching solution mass ratio 10: 1000, add barium chloride to the above rare earth leaching solution, stir Mix evenly; add 20% sodium hypochlorite solution according to the molar ratio of sodium hypochlorite: iron filings 9:1, stir for 3 hours, add 9000ppm of 1%wt polyacrylamide solution, let it stand for clarification, suck out the clear liquid, filter, and precipitate That is to remove radium slag, and the clear liquid is the rare earth leaching solution after radium removal, and the concentration of radium in it is 0.065Bq / L as measured by analysis.

Embodiment 3

[0015] Nanfang ionic type rare earth leaching solution, in which the concentration of rare earth ions is 0.85mol / L, the concentration of radium is 20Bq / L, and pH=3.5. Add ferrous chloride to the rare earth leaching solution according to the mass ratio of ferrous chloride: rare earth leaching solution 10: 1000, stir and mix for 0.5 hours; press barium chloride: the mass ratio of rare earth leaching solution 5: 1000 to add 30%wt Barium chloride solution, stir and mix evenly; add 50% sodium hypochlorite according to the molar ratio of sodium hypochlorite:iron filings 5:1, stir for 0.5 hours, add 1%wt polyacrylamide solution of 1000ppm, let it stand for clarification, suck out the clear Liquid, filtration, precipitation is radium removal slag, clear liquid is rare earth leaching solution after radium removal, and the concentration of radium in it is 0.050Bq / L as measured by analysis.

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PUM

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Abstract

The invention relates to a method for removing radium from south ionic rare earth leachate. The method is characterized in comprising the steps that: (1) ferrous salt or iron chips are added into a rare earth leachate according to a mass ratio that ferrous salt or iron chips to rare earth leachate is 0.1-10:1000; the materials are mixed for 0.5-6h by stirring; (2) solid barium chloride or a barium chloride solution are added into the rare earth leachate obtained in the step (1) according to a mass ratio that barium chloride to rare earth leachate is 0.1-10:1000; and the materials are uniformly mixed by stirring; (3) an oxidant is added into the rare earth leachate obtained in the step (2) according to a molar ratio that oxidant to rare earth leachate is 0.1-10:1; stirring is carried out for 0.5-3h, and 1-100ppm polyacrylamide flocculant is added; the material is subjected to standing and is clarified; clear solution is sucked; filtering is carried out; the precipitate is the radium-removing slag, and the clear solution is the radium-removed rare earth leachate. With the method provided by the invention, radium can be deeply removed from the rare earth leachate. The process is simple, separation effect is good, and subsequent rare earth separation processes are not affected.

Description

technical field [0001] The invention relates to a method for removing radium from southern ionic type rare earth leaching solution. Background technique [0002] Rare earth minerals contain a certain amount of radioactive substances, and the radioactive elements of different rare earth minerals are quite different. In the past, people's research on rare earth radioactivity mainly focused on monazite, bastnaesite and their mixed ores. However, the ionic rare earth ores in my country also contain some radioactive elements radium. Because the ionic rare earth ore contains radioactive element radium, the rare earth leaching solution also contains a small amount of radioactive element radium. The radium concentration is 1~30Bq / L, and the total radioactivity of the leaching solution is relatively high. These radioactive elements are further dispersed during the separation process, leading to an increase in the area of ​​radioactive contamination in the production environment, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B59/00C22B60/00
CPCY02P10/20
Inventor 刘志强邱显扬朱薇郭秋松
Owner GUANGDONG INST OF RARE METALS
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