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Method for leaching bastnaesite-containing rare-earth ore concentrates in complexing mode and preparing kryocide

A rare earth concentrate, cryolite technology, applied in aluminum fluoride, process efficiency improvement, aluminum halide and other directions, can solve the problem of unable to solve the problem of fluorine recycling, large fluorine-containing waste water, pollution of the environment and other problems, achieve good Economic and environmental benefits, low equipment requirements, and good quality effects

Inactive Publication Date: 2013-01-30
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alkaline method has high requirements on mineral grades, strict requirements on equipment corrosion resistance, high alkali consumption, and produces a large amount of fluorine-containing wastewater. If it is not treated, it will also pollute the environment.
[0006] The fundamental problem with the above methods is that none of them can solve the problem of recycling fluorine in Baotou rare earth mines, so that fluorine enters the atmosphere or waste water and pollutes the environment

Method used

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  • Method for leaching bastnaesite-containing rare-earth ore concentrates in complexing mode and preparing kryocide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, 2 kg of Sichuan Mianning bastnaesite was weighed, and the rare earth oxide content was 61.5%. In a closed device with a condensing system, add 3mol / L hydrochloric acid at a liquid-solid ratio of 8:1, add 5ml of analytically pure hydrofluoric acid, heat to 95°C, add the above concentrate, stir at a constant speed for 2 hours, and react After finishing, cool to 55°C, filter and wash to obtain filtrate I and filter residue. The filtrate I is recycled.

[0031] Add HCl solution and AlCl to the filter residue 3 Solid, complex leaching according to the following conditions: In a closed device with a condensation system, the concentration of HCl is 6mol / L, AlCl 3 The concentration is 2mol / L, the leaching temperature is 110°C, and the liquid-solid ratio is 30:1. After stirring at a constant speed for 90 minutes, cool to 85°C and heat filter, and wash the filter residue with 85°C distilled water for 3 times to obtain filtrate II.

[0032] Will K 2...

Embodiment 2

[0035] Such as figure 1As shown, 2 kg of Sichuan Mianning bastnaesite was weighed, and the rare earth oxide content was 61.5%. In a closed device with a condensing system, add 3mol / L hydrochloric acid at a liquid-solid ratio of 8:1, add 7g of sodium fluoride solid, heat to 95°C, add the above concentrate, stir at a constant speed for 2 hours, and the reaction is over After cooling to 55°C, filtering and washing, the filtrate I and filter residue were obtained. The filtrate I is recycled.

[0036] Add HCl solution and AlCl to the filter residue 3 Solid, complex leaching according to the following conditions: In a closed device with a condensation system, the concentration of HCl is 6mol / L, AlCl 3 The concentration was 2mol / L, the leaching temperature was 110°C, the liquid-solid ratio was 30:1, stirred at a constant speed for 90 minutes, then cooled to 85°C for hot filtration, and the filter residue was washed 3 times with 85°C distilled water to obtain filtrate II.

[0037]...

Embodiment 3

[0040] Such as figure 1 As shown, 2kg of Baotou mixed rare earth concentrate was weighed, and the content of bastnaesite was 41.06%. In a closed device with a condensation system, add 3mol / L hydrochloric acid at a liquid-solid ratio of 8:1, add 6g of calcium fluoride solid, heat to 95°C, add the above concentrate, stir at a constant speed for 2 hours, and the reaction is over After cooling to 55°C, filtering and washing, the filtrate I and filter residue were obtained. The filtrate I is recycled.

[0041] Add HCl solution and AlCl to the filter residue 3 Solid, complex leaching according to the following conditions: In a closed device with a condensation system, the concentration of HCl is 6mol / L, AlCl 3 The concentration is 2mol / L, the leaching temperature is 110°C, and the liquid-solid ratio is 30:1. After stirring at a constant speed for 90 minutes, cool to 85°C and heat filter, and wash the filter residue with 85°C distilled water for 3 times to obtain filtrate II.

[...

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Abstract

The invention discloses a method for leaching bastnaesite-containing rare-earth ore concentrates in a complexing mode and preparing kryocide, and belongs to the technical field of rare-earth hydrometallurgy. The method comprises the following steps of: adding hydrochloric acid with a certain concentration and easily-dissolved fluorides into the bastnaesite-containing rare-earth ore concentrates to remove calcium and iron from the rare-earth ore concentrates, filtering, washing, and adding the hydrochloric acid and aluminum chloride to perform complexing leaching; discomposing bastnaesite in the rare-earth ore concentrates into a solution, so that fluorine and aluminum exist in the solution in a complex mode; and separating rare earth by using a double salt precipitation method, adding kryocide seed crystals into a filtrate, and regulating the pH value of the solution by using alkali liquor to prepare the white kryocide product. The method is operated at low temperature in a wet method, and is low in cost, small in pollution to environment and high in economic benefits, energy consumption is reduced greatly, and equipment is simple.

Description

[0001] technical field [0002] The invention relates to a complex leaching of bastnaesite-containing rare earth concentrate and a cryolite preparation method, belonging to the technical field of rare earth hydrometallurgy. Background technique [0003] Rare earth concentrates containing bastnaesite include single bastnaesite and mixed rare earth minerals such as bastnaesite and monazite. The bastnaesite chemical formula can be expressed as REFCO 3 or REF 3 ·RE 2 (CO 3 ) 3 , is a complex compound of rare earth carbonate and rare earth fluoride. This mineral is mainly distributed in California in the United States, Baiyun Obo in Inner Mongolia, Mianning County in Sichuan, Weishan County in Shandong and other places. Bastnaesite is thermally decomposed into rare earth oxides and oxyfluorides, and then rare earths are extracted by acid leaching, alkaline leaching or acid-base progressive leaching. [0004] At present, for the various decomposition methods of single-type ...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/44C01F7/54C22B59/00
CPCY02P10/20
Inventor 李梅张晓伟柳召刚王觅堂胡艳宏阳建平刘佳
Owner INNER MONGOLIA UNIV OF SCI & TECH
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