Preparation method of low-thorium lutetium oxide

A lutetium oxide and lutetium chloride technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of huge equipment investment, incomplete separation of rare earth and thorium, and difficult to achieve continuous production, and achieve good separation. Effect, good layering, short series effect

Active Publication Date: 2010-06-23
江阴加华新材料资源有限公司
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Problems solved by technology

The patent only mentions that the rare earth nitrate liquid is suitable for this process, and does not mention other acidic rare earth materials; the extraction vessel of this process is a kettle type, tank type or tubular container, and an ultrasonic generating device is installed at the same time, so it is difficult to realize continuous production. Even if continuous pro...

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example 1

[0016] The lutetium chloride feed solution separated by extraction with P507 and other extractants has a rare earth concentration of 1.1mol / L and a thorium content of 56μg / ml. After the first countercurrent extraction of the 6-stage N235 extraction system, the concentration of N235 is 1.1mol / L, the diluent is kerosene, and the flow ratio used is extractant N235: lutetium chloride feed liquid=5: 1 (volume ratio), and the thorium chloride content in the lutetium chloride in the raffinate that obtains is reduced to 6.5 μ g / ml, the organic phase of the extracted thorium is back-extracted with 0.5mol / L sodium hydroxide and then recycled; The concentration of lutetium chloride is 0.6mol / L, and diluent is kerosene, and the flow ratio used is the kerosene solution of organic phase naphthenic acid: lutetium chloride feed liquid=3: 1 (volume ratio), in the raffinate lutetium chloride that obtains The thorium content is reduced to less than 0.1 μg / ml, and the concentration of lutetium ...

example 2

[0018] The lutetium chloride feed solution extracted and separated by extraction agents such as P507 has a rare earth concentration of 1.06mol / L and a thorium content of 356μg / ml. After the first countercurrent extraction of the 10-stage N235 extraction system, the concentration of N235 is 1.0 mol / L, the diluent is kerosene, and the flow ratio used is extractant N235: lutetium chloride feed liquid=8: 1 (volume ratio), and the thorium content in the raffinate lutetium chloride that obtains is reduced to 21.5 μ g / ml , the organic phase of the extracted thorium is back-extracted with 0.5mol / L sodium carbonate and then recycled; It is 0.55mol / L, diluent is kerosene, and used flow ratio is the kerosene solution of organic phase naphthenic acid: lutetium chloride feed liquid=4: 1 (volume ratio), the thorium in the raffinate lutetium chloride obtained The content is reduced to less than 0.1μg / ml, and the lutetium chloride is 0.95mol / L; the organic phase of thorium extraction is back-...

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Abstract

The invention relates to a preparation method of low-thorium lutetium oxide, comprising the following steps of: firstly carrying out 3-10 level of primary countercurrent extraction on lutetium oxide extracted from a solvent as a raw material by adopting an isooctanol or kerosene solution of 0.5-2.0mol/L of N235 extracting agent, and then carrying out 3-10 level of countercurrent washing selective backextraction on organic phases of extracted thorium by adopting 0.1-2mol/L of alkali abluent solution; then separating the low-thorium lutetium oxide by a kerosene solution of 0.1-1.0mol/L of another extracting agent, carrying out 3-10 level of countercurrent washing selective backextraction on the organic phases of the extracted thorium by adopting 0.5-2mol/L of acidic abluent solution, carrying out oxalic precipitation, washing and dehydration on aqueous-phase lutetium oxide after thorium removal, and burning at the condition of 750-1000 DEG C to obtain a product, namely, the low-thorium lutetium oxide. In the method, rare earth and thorium are thoroughly separated, and the organic extracting agent is low in price.

Description

(1) Technical field [0001] The invention relates to a method for continuously producing low-thorium lutetium oxide by solvent extraction and separation of lutetium oxide raw materials with high thorium content. It belongs to the technical field of hydrometallurgy. (2) Background technology [0002] Lutetium oxide is a very important rare earth material, widely used in optical glass, electronic components and magnetic materials and other fields. Since the rare earth ore contains relatively high thorium oxide, more than 90% of the thorium oxide is enriched in the lutetium oxide product after extraction and separation by extraction agents such as P507, and the content of thorium is about 10-500 μg / ml, while in Precipitants commonly used in the rare earth separation industry (such as oxalic acid, ammonium bicarbonate) are difficult to remove thorium oxide therein, and the removal rate is less than 5%, so that most of the thorium oxide in the rare earth ore goes into the lutetiu...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B59/00C01F17/00
CPCY02P10/20
Inventor 史卫东肖睿朱荣华
Owner 江阴加华新材料资源有限公司
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