Method for preparing rare earth chloride from mixed rare earth concentrate or monazite concentrate

A mixed rare earth and rare earth chloride technology, applied in the direction of improving process efficiency, can solve problems such as three-waste pollution, and achieve the effects of high decomposition rate, fast decomposition speed and short time consumption

Inactive Publication Date: 2016-05-04
李梅
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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-cost, energy-saving and environment-friendly method for preparing rare earth chloride from mixed rare earth concentrate or monazite concentrate, which solves the three wastes pollution and resource comprehensive utilization problems in the rare earth smelting process , so that the clean smelting process of liquid alkali decomposition of rare earth concentrate under high pressure can realize industrial production

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  • Method for preparing rare earth chloride from mixed rare earth concentrate or monazite concentrate

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Effect test

Embodiment 1

[0022] (1) Add bastnaesite and monazite-based mixed rare earth concentrate with a rare earth grade of 60.85% to a sodium hydroxide solution with a mass concentration of 55% and mix evenly, with a solid-to-liquid ratio of 1:3. Alkali decomposition is carried out in the reactor, the alkali decomposition temperature is controlled at 200°C, the stirring speed is 450r / min, the reaction time is 2 hours, and the pressure in the high-pressure reactor is 2.4MPa to obtain alkali-decomposed minerals;

[0023] (2) Wash the alkali-decomposed minerals obtained in step (1) with water. The washing temperature is controlled at 70°C, and the water is washed until pH=8.0 and filtered to obtain the washing residue and washing liquid. The washing liquid is concentrated and crystallized to recover sodium hydroxide and fluoride. sodium and sodium phosphate;

[0024] (3) Leach the washed slag obtained in step (2) with hydrochloric acid. The leaching temperature is controlled at 80°C, the solid-to-liq...

Embodiment 2

[0027] (1) Add monazite rare earth concentrate with a rare earth grade of 64.27% to a certain concentration of sodium hydroxide solution and mix evenly, then add it to a high-pressure reactor for alkali decomposition. The concentration of sodium hydroxide is 65%, and the solid-to-liquid ratio is 1 : 6, the alkali decomposition temperature is controlled at 190°C, the stirring speed is 500r / min, the reaction time is 2h, and the pressure in the autoclave is 2.2MPa;

[0028] (2) Wash the alkali-decomposed minerals obtained in step (1) with water. The washing temperature is controlled at 75°C, and the water is washed until pH=8.5 and filtered to obtain the washing residue and washing liquid. The washing liquid is concentrated and crystallized to recover sodium hydroxide and fluoride. sodium and sodium phosphate;

[0029] (3) Leach the washed slag obtained in step (2) with hydrochloric acid. The leaching temperature is controlled at 70°C, the solid-to-liquid ratio is 1:6, the concen...

Embodiment 3

[0032] (1) Add bastnaesite and monazite-based mixed rare earth concentrate with a rare earth grade of 65.48% to a certain concentration of sodium hydroxide solution and mix evenly, then add it to an autoclave for alkali decomposition, and sodium hydroxide The concentration is 45%, the solid-liquid ratio is 1:3, the alkali decomposition temperature is controlled at 220°C, the stirring speed is 450r / min, the reaction time is 1.5h, and the pressure in the autoclave is 3MPa;

[0033] (2) Wash the alkali-decomposed minerals obtained in step (1) with water. The washing temperature is controlled at 50°C, and the water is washed until pH=8.5 and filtered to obtain the washing residue and washing liquid. The washing liquid is concentrated and crystallized to recover sodium hydroxide and fluoride. sodium and sodium phosphate;

[0034] (3) Leach the washed slag obtained in step (2) with hydrochloric acid. The leaching temperature is controlled at 75°C, the solid-to-liquid ratio is 1:7, t...

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Abstract

The invention relates to a method for preparing rare earth chloride from mixed rare earth concentrate or monazite concentrate and belongs to the field of hydrometallurgy. According to the method, the rare earth chloride with the rare earth leaching rate reaching 94.87-99.26% is prepared by controlling the alkali decomposing temperature, the reaction time and the reaction pressure of the mixed rare earth concentrate or the monazite concentrate in the high-pressure alkali decomposing process. The method has the beneficial effects that the mineral decomposing rate is high under the high-pressure condition, the decomposing temperature is reduced, the reaction time is shortened, and energy conservation and environment friendliness are achieved; caustic soda can be recycled, so that cost is reduced; no three-waste pollution is generated, and various valuable elements are comprehensively recycled; and the technological process is short, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing rare earth chloride solution from mixed rare earth concentrate or monazite concentrate, which belongs to the field of hydrometallurgy. Background technique [0002] Baotou mixed rare earth concentrate is a unique compound rare earth mineral in my country. It is mainly composed of bastnaesite and monazite. Bastnaesite is rare earth fluorocarbonate, and monazite is rare earth phosphoric acid. Salt, the mass ratio of bastnaesite to monazite in the mine fluctuates between 9:1 and 9:4. Baotou mixed rare earth concentrate contains monazite, which is chemically stable at high temperatures and is difficult to decompose at room temperature; in addition to bastnaesite and monazite, Baotou mixed rare earth concentrate also contains iron minerals (Fe 2 o 3 , Fe 3 o 4 ), Fluorite (CaF 2 ), barite (BaSO 4 ), apatite (Ca 5 F(PO 4 ) 3 ) and other minerals, the mineral composition structure is complex; the cerium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/10
CPCC22B3/10C22B59/00Y02P10/20
Inventor 李梅高凯耿彦华张栋梁李健飞乔晓明
Owner 李梅
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