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Method for separating valuable components of monazite slags

A separation method and technology of stone slag, applied in the field of separation of valuable components of solitary stone slag, can solve problems such as unfavorable environmental protection management, environmental hazards, and neglected recycling

Active Publication Date: 2013-02-13
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

[0013] A method for separating valuable components of monazite slag, comprising the following steps:

[0014] (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;

[0015] 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.

[0016] (2) Pressure filtration...

Embodiment 2

[0023] 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.

[0024] 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

[0030] 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.

[0031] 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 method for separating valuable components of monazite slags, and particularly relates to a method for separating valuable components of monazite slags into a liquid phase (a solution containing uranium, thorium and rare earth) and a solid phase (a filter residue containing useful minerals such as monazite, zirconite and rutile). The method is characterized by comprising the following steps of acid leaching, filter pressing and water scrubbing. According to the invention, monazite slags are subjected to low-acid and low-temperature leaching, and a liquid phase and a solid phase are separated easily; after secondary slags are subjected to mineral processing and alkaline decomposition by using a mineral processing process, the closed cycle collection of uranium, thorium and rare earths can be realized; meanwhile, an extract residue waste acid can be subjected to cyclic utilization, thereby reducing the wastewater discharge, reducing the consumption of sulfuric acids and new water and the wastewater treatment cost, and reducing the production cost; and the recovery rates of valuable elements such as uranium, thorium and rare earths can be greater than 97%, therefore, an effect of no radioactive wastewater and waste residue discharge in the whole process can be achieved.

Description

technical field [0001] The present invention relates to a method for separating valuable elements in radioactive waste, in particular to a method for separating valuable components in monazia slag, in particular to a method for separating valuable components in monazia slag into liquid phases (containing uranium, thorium, rare earth solution) and solid phase (filter residue containing monazite, zircon, rutile and other useful minerals). 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 ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B60/02C22B60/04C22B59/00
CPCY02P10/20
Inventor 王琦陈月华崔震任萍许鸽鸣郭卫权朱焱
Owner YIYANG HONGYUAN RARE EARTH
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