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Method for smelting and separating uranium, thorium and rare earth from residual slag of processed monazite

A technology of slag melting and stone optimization, which is applied in the field of smelting and separating uranium, thorium and rare earth, can solve the problems of easy emulsification of organic phase and low extraction capacity, and achieve the effect of improving recovery rate, simple and flexible process flow, and reducing the number of units

Active Publication Date: 2020-04-14
湖南中核金原新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems such as low extraction capacity and easy emulsification of the organic phase in the above methods.

Method used

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  • Method for smelting and separating uranium, thorium and rare earth from residual slag of processed monazite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Monazite excellent slag: U: 0.284%, ThO2 : 12.28%, REO: 11.36%, Fe: 0.83%.

[0056] Measure the 6mol / L HCl solution prepared in the dilute hydrochloric acid high-level metering tank and pour it into the dissolution tank, start stirring, heat and preheat, and when the temperature rises to 40°C, put monazite excellent slag into the dissolution tank, with a liquid-solid ratio of 1.5: 1. Warm and stir to dissolve, the reaction temperature is controlled at 92±2°C, the reaction time is 6h, and then boiled for 1.5h, the boiling temperature is 105±2°C. After boiling, stop heating, turn on the cooling water in the jacket of the reaction kettle to condense, when the temperature of the solution drops to 51°C, add 35.2% hydrogen peroxide at the rate of 0.050kg hydrogen peroxide / kg excellent molten slag, continue to keep warm for 12 hours, and siphon Extract the solution by means of supernatant liquid and inspection filter. The slurry after siphoning is washed by 3-stage countercur...

Embodiment 2

[0066] Monazite excellent slag: U: 0.164%, ThO 2 : 10.69%, REO: 10.48%, Fe: 1.06%.

[0067] Measure the 6mol / L HCl solution prepared in the dilute hydrochloric acid high-level metering tank and pour it into the dissolution tank, start stirring, heat and preheat, and when the temperature rises to 40°C, put monazite excellent slag into the dissolution tank, with a liquid-solid ratio of 1.5: 1. Warm and stir to dissolve, the reaction temperature is controlled at 85±2°C, the reaction time is 5h, and then boiled for 1.5h, the boiling temperature is 105±2°C. Stop heating after boiling, turn on the cooling water in the jacket of the reaction kettle to condense, when the temperature of the solution drops to 55°C, add 35.0% hydrogen peroxide at the rate of 0.050kg hydrogen peroxide / kg excellent molten slag, heat preservation and aging for 10h, use siphon Clear liquid and extract solution by means of inspection and filtration. The slurry after siphoning is washed by three-stage counte...

Embodiment 3

[0077] Monazite excellent slag: U: 0.301%, ThO 2 : 8.42%, REO: 9.98%, Fe: 0.96%.

[0078] Measure the 6mol / L HCl solution prepared in the dilute hydrochloric acid high-level metering tank and pour it into the dissolution tank, start stirring, heat and preheat, and when the temperature rises to 40°C, put monazite excellent slag into the dissolution tank, with a liquid-solid ratio of 1.5: 1. Heat and stir to dissolve, the reaction temperature is controlled at 90±2°C, the reaction time is 4h, and then boiled for 1.0h, the boiling temperature is 105±2°C. Stop heating after boiling, turn on the cooling water in the jacket of the reaction kettle to condense, when the temperature of the solution drops to 50°C, add 35.0% hydrogen peroxide at the rate of 0.050kg hydrogen peroxide / kg excellent molten slag, heat preservation and aging for 12h, and use siphon Clear liquid and extract solution by means of inspection and filtration. The slurry after siphoning is washed by three-stage coun...

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Abstract

The invention provides a method for smelting and separating uranium, thorium and rare earth from residual slag of processed monazite. The residual slag of processed monazite is used as the raw material. The method comprises the following steps of performing hydrochloric acid complete dissolving, performing dissolving liquid aging, performing liquid-solid separation, extracting uranium by an amineextraction agent and performing extracting and enriching, extracting thorium from an acidic phosphorus-containing extraction agent and performing wastewater treatment. A raffinate phase obtained afterthorium extraction is returned to a monazite hydrochloric acid optimum solubilizing procedure to recover a rare earth chloride mixture, after extraction and separation, a single uranium product and athorium product are obtained through precipitation, and the recovery rate of resources such as uranium, thorium and rare earth is greater than 95%; and most of process water in the production processis directly returned to a system for cyclic utilization, a small amount of wastewater is recycled back to the system after comprehensive treatment, and zero drainage of the wastewater is realized. Bythe adoption of the technical scheme, the flow is simple and flexible, and large-scale production is achieved easily; the chemical material consumption is low, valuable resources such as rare earth,uranium and thorium can be efficiently recovered, and the resource recovery rate is increased; and the comprehensive treatment and environmental-friendly, efficient and clean production of the monazite resources are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of uranium, thorium and rare earth extraction, and in particular relates to a method for smelting and separating uranium, thorium and rare earth from monazite slag. Background technique [0002] Monazite is a phosphate mineral of rare earth and thorium uranium, and is one of the main minerals of rare earth metal ore. The monazite concentrate comprehensive smelting process includes five parts: alkali decomposition, phosphorus alkali recovery, rare earth recovery and impurity separation, uranium and thorium resource recovery, and wastewater treatment. During the smelting process of extracting rare earth and phosphorus from monazite concentrate, a large amount of excellent molten slag will be produced. [0003] Excellent slag contains U: 0.1%-2.0%, ThO2: 5%-20%, REO: 5%-20%, and undecomposed monazite, zircon, rutile and other useful minerals. Since the uranium resource has not been extracted and the thorium r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B59/00C22B60/02
CPCC22B7/006C22B7/04C22B59/00C22B60/026C22B60/0291Y02P10/20
Inventor 曾中贤谢凌峰刘浩施雨张伟超李春湘段颖杰张伟华
Owner 湖南中核金原新材料有限责任公司
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