Sulfuric acid process for treating bastnaesite and separating and purifying cerium

A bastnasite and sulfuric acid method technology is applied in the fields of bastnaestite smelting and rare earth hydrometallurgy, which can solve the problems of insufficient research, difficult control of stripping process, emulsification, etc., and achieves good separation effect, easy operation, The effect of improving the unit yield of the equipment

Inactive Publication Date: 2005-10-19
北京方正稀土科技研究所有限公司
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AI Technical Summary

Problems solved by technology

This method is an economical and clean method, but the current research is not sufficient, the stripping process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 100g bastnaesite concentrate (TREO=65%, CeO 2 / TREO=47.66%), containing 65g of rare earth, of which CeO 2 30.98g. Roast at 500°C for 1 hour, take it out and cool slightly, and after slurrying with 450ml of water, slowly add 43ml of 98% concentrated sulfuric acid along the beaker wall. The temperature of the system was 89°C, and the reaction was stirred for 30 minutes. Suction filtration to dryness, obtain 454ml rare earth feed liquid, rare earth concentration is 141.26g / L, CeO 2 / TREO=47.65%, 98.23% of which exists in the form of tetravalent cerium, namely Ce IV o 2 =66.2g / L, the leaching rate is 98.67%, H + =0.6mol·L -1 .

[0027] Slowly add the feed solution to 700ml 2.0mol L under stirring -1 Na 2 CO 3 solution, stirred for 30 minutes, aged for 30 minutes, and filtered with 20ml 2.0mol / L Na 2 CO 3 The filter cake was washed twice with the solution, and the washing liquid was mixed with the filtrate to obtain a volume of 1.15 L. where CeO 2 The con...

Embodiment 2

[0032] Weigh 200g bastnaesite (TREO=50%, CeO 2 / TREO=48%), roasted at 600°C for 30 minutes, took it out and cooled it slightly, adjusted the slurry with 600ml of water, added 35ml of concentrated sulfuric acid, stirred for 30 minutes, and obtained 630ml of material liquid, in which the rare earth concentration was 156.8g L -1 , CeO 2 =74.7g·L -1 , The total rare earth leaching rate is 98.8%.

[0033] Adding the resulting feed solution to 750ml concentration is 1.2mol L -1 of (NH 4 ) 2 CO 3 solution, stirred for 30min, and the filtrate obtained by suction filtration contained tetravalent cerium 32.9g L -1 , with a concentration of 2.0mol L in 20ml -1 of (NH 4 ) 2 CO 3 The filter cake was washed 2 times with solution and 3 times with water. The total rare earth content in the filter cake is 58.8%, CeO 2 / TREO4.15%. 50.89 g of the oxide was obtained.

[0034] Take 500ml of the resulting filtrate, add 5.0g of hydroxylamine hydrochloride, stir for 1 hour, the color of...

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Abstract

The present invention belongs to the field of wet RE metallurgical technology, and is especially method of treating bastnaesite and separating and purifying cerium. Fluorine containing RE sulfuric acid solution is obtained through improved sulfuric acid leaching process. Cerium and non-cerium RE are separated with ammonium carbonate, alkali metal carbonate or bicarbonate at room temperature, and non-cerium RE produces RE carbonate precipitate while tetravalent cerium and tetravalent thorium producing soluble coordination compound together with carbonate. Tetravalent cerium may be reduced into trivalent cerium to produce cerium carbonate precipitate, which may be calcined into CeO2 product. Thorium remains in the solution for reuse until reaching to certain concentration and recovering thorium, sulfate and fluoride. The present invention has high separation efficiency, high yield, no environmental pollution and other advantages.

Description

technical field [0001] The invention belongs to the technical field of rare earth hydrometallurgy, and further description belongs to the technical field of bastnaesite smelting. Background technique [0002] Bastnaesite is an important light rare earth resource. Since cerium accounts for 50% of all rare earths, most of the cerium should be recovered first when selecting a smelting process. However, due to the discovery of pure bastnaesite resources later than monazite ore and mixed concentrate, the current research and development of smelting technology for this mineral is not perfect, and most of the processes are based on monazite ore and mixed concentrate. Therefore, there are some problems in varying degrees, such as: complex technological process, high cost, and serious environmental pollution. [0003] Chinese patent 1133346 (a process for extracting and separating cerium from fluorine-containing sulfuric acid rare earth solution, published on October 16, 1996) discl...

Claims

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Application Information

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IPC IPC(8): C22B3/08
CPCY02P10/20
Inventor 刘营廖春生张玻贾江涛王嵩龄严纯华
Owner 北京方正稀土科技研究所有限公司
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