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Separation and recovery method of uranium, thorium and rare earth in monazite slag

A technology for separation and recovery of rare earths, applied in the field of separation and recovery of rare earths, thorium, and uranium in monazite slag, which can solve the problems of neglected recovery, environmental hazards, unfavorable environmental protection management, etc., and reduce the consumption of sulfuric acid and fresh water and waste water Effects of treatment cost, reduction of waste water discharge, and easy separation

Active Publication Date: 2014-04-09
YIYANG HONGYUAN RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the thorium with the most content has not found a major use, the recovery of these resources has not been paid attention to, and it has become a pile of troublesome radioactive waste, which is not conducive to environmental protection management. insurmountable barriers to development
At present, there are about 50,000 tons of solitary slag in the country, and nearly 10,000 tons of slag are produced every year. If the management is not standardized, it will cause great harm to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for separating and recovering uranium, thorium, and rare earth in monazite slag, comprising the following steps:

[0020] (1) Acid leaching: According to the ratio of monazia slag (㎏):acid (L)=1:1~15, add monazia slag to the sulfuric acid solution with a concentration of 0.25mol / L~0.5mol / L, and heat to 40 ℃~100℃, stir for 5 hours to 8 hours, cool and stand for clarification for 4 hours to 8 hours, siphon the supernatant to obtain a solution containing uranium, thorium, and rare earth valuable elements;

[0021] In this example, according to the ratio of solitary slag (㎏): acid (L) = 1:10, the solitary slag (H 2 O: 30.80%, ThO 2 ﹪: 24.2﹪, REO﹪: 9.65﹪, U﹪: 0.77﹪) into the reaction kettle filled with sulfuric acid solution with a concentration of 0.25mol / L, heated to 55°C, stirred for 5 hours, cooled and clarified until the supernatant was clear , the standing time is 5h, siphon the supernatant to the storage tank, and leave the solid phase in the reactor.

[0...

Embodiment 2

[0044] In order to improve the recovery rate of valuable elements uranium, thorium and rare earth, the present invention carries out secondary acid leaching after step ⑴, according to the ratio of monazite slag (㎏):acid (L)=1:1~3, the concentration is 0.25 Add mol / L~0.5mol / L sulfuric acid solution into the slurry after siphoning supernatant, heat to 40℃~100℃, stir for 5 hours to 8 hours, cool and stand for clarification for 4 hours to 8 hours, siphon up The supernatant liquid obtained in step (1) is combined with the supernatant liquid to obtain a solution containing uranium, thorium, and rare earth valuable elements.

[0045] In this embodiment, after step ⑴, according to the ratio of monazia slag (㎏):acid (L)=1:2, a sulfuric acid solution with a concentration of 0.25mol / is added to the slurry after siphoning the supernatant, and heated to Stir at 60°C for 5 hours, cool and stand for clarification for 6 hours, siphon the supernatant and combine it with the supernatant obtaine...

Embodiment 3

[0051] In step (1) of this embodiment, according to the ratio of monazia slag (㎏): acid (L) = 1:12, monazia slag is added to the reaction kettle filled with sulfuric acid solution with a concentration of 0.25mol / L, and heated to 60 ℃, stirring for 6 hours, cooling and standing still to clarify until the supernatant is clear, standing time is 6h, siphon the supernatant into the storage tank, and keep the solid phase in the reaction kettle.

[0052] In order to improve the recovery rate of valuable elements uranium, thorium and rare earth, the present invention carries out secondary acid leaching after step (1), according to the ratio of monazite slag (㎏):acid (L)=1:1.5, the concentration is 0.35 mol / L sulfuric acid solution was added to the slurry after the siphon supernatant, heated to 80°C, stirred for 5 hours, cooled and left to clarify for 6 hours, the siphon supernatant was combined with the supernatant obtained in step (1) to obtain a mixture containing uranium, The solut...

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Abstract

The invention discloses a separation and recovery method of uranium, thorium and rare earth in monazite slag, namely a method for separating and recovering valuable elements uranium, thorium and rare earth from monazite slag. The method is characterized by comprising the following steps of: acid leaching, filter pressing, washing and extraction of valuable components. According to the invention, the uranium, thorium and rare earth are leached out by weak acid at a low temperature, and the liquid phase and solid phase are easy to separate; the secondary slag is subjected to beneficiation and alkaline decomposition by a beneficiation technology, and closed-loop circular recovery of uranium, thorium and rare earth is realized; and meanwhile, the waste acid of residual liquid is circularly used, the discharge of wastewater is reduced, the consumption of sulfuric acid and new water as well as the wastewater treatment cost are reduced, the production cost is lowered, the recovery rate of the valuable elements uranium, thorium and rare earth is greater than 97%, and the discharge of radioactive wastewater and waste residue is avoided in the whole technology.

Description

technical field [0001] The invention relates to a method for comprehensive recovery of valuable elements in radioactive waste residue, in particular to a method for separation and recovery of uranium, thorium and rare earth in monazite slag. Background technique [0002] Monazite is one of the four major raw materials for my country's rare earth industry. Monazite is mainly stored in coastal placer deposits in Guangdong, Guangxi, and Hainan Island. It is mainly associated with minerals such as zirconium and titanium. There are also monazite mines inland. For example, there is a very large monazite mine in Yuankou, Yueyang, Hunan. Monazite belongs to light rare earth ore. The current production process is: monazite concentrate is decomposed by alkali, and useful rare earth and phosphorus are extracted from the feed liquid, and the remaining solid product contains about 16-28% ThO 2 , 0.6-1.2% of U and 9-20% of REO, and undecomposed monazite, zircon, rutile and other useful ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/22C22B3/42C22B3/26C22B60/02C22B59/00
CPCY02P10/20
Inventor 王琦任萍陈月华崔小震许鸽鸣
Owner YIYANG HONGYUAN RARE EARTH
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