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A method for smelting and separating uranium, thorium and rare earth from monazite excellent molten slag

A slag-dissolving technology, which is applied in the fields of uranium, rare earth extraction, and thorium, can solve the problems of low extraction capacity and easy emulsification of organic phases.

Active Publication Date: 2021-05-18
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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  • A method for smelting and separating uranium, thorium and rare earth from monazite excellent molten slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Monazite excellent slag: U: 0.284%, ThO 2 : 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 counterc...

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 monazite excellent slag, using monazite excellent slag as raw material, comprising the following steps: complete dissolution of hydrochloric acid, aging of solution solution, liquid-solid separation, and extraction of amine extractant Extraction and enrichment of uranium, extraction of thorium with acidic phosphorus-containing extractants, and wastewater treatment. The raffinate aqueous phase obtained after thorium extraction is returned to the monazite hydrochloric acid excellent dissolution process to recover the rare earth chloride mixture, and after extraction and separation, a single uranium product and thorium product are obtained through precipitation. The recovery rate of uranium, thorium, rare earth and other resources is greater than 95%. Production Most of the process water is directly returned to the system for recycling, and a small amount of waste water is returned to the system after comprehensive treatment to achieve zero discharge of waste water. The flow of the technical solution provided by the invention is simple and flexible, and it is easy to realize large-scale production. The consumption of chemical materials is low, and valuable resources such as rare earths, uranium and thorium can be recovered efficiently, and the recovery rate of resources can be improved. Ensure the comprehensive treatment of monazite resources is green and environmentally friendly, and efficient and clean production.

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 Patents(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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