Impurity removal method for rare earth leaching solution

A leachate and rare earth technology, applied in the field of impurities, can solve the problems of poor removal of iron and silicon, failure to meet production requirements, and stay in the research stage, etc., to reduce liquid-solid separation time, improve separation selectivity, and reduce rare earth The effect of loss rate

Active Publication Date: 2021-11-26
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

Although the precipitation method can remove impurities, the loss of rare earth is large, the alkali consumption is high, and the obtained precipitate is usually colloidal, which is very difficult to filter and cannot meet the production requirements, so it has not been popularized and applied.
[0006] The impurity removal principle of the ion exchange method is similar to that of the extraction method, which has a good removal effect on aluminum, but has a poor removal effect on iron and silicon.
In addition, a large amount of waste water is generated during its use, and the loss of rare earth is relatively large. Therefore, this method is still in the research stage
[0007] Therefore, there are obvious deficiencies in both naphthenic acid extraction and precipitation removal, such as poor removal of iron, aluminum, and silicon, high cost of use, and large loss of rare earths.
Although naphthenic acid is currently the mainstream impurity removal process, it only has a good separation effect on aluminum, and has a poor effect on iron and silicon. Due to its obvious aging phenomenon, this makes enterprises face many problems in production management and operation. Therefore, the industry urgently needs to develop a rare earth leachate purification method with simple process, simultaneous removal of impurities, and low cost

Method used

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  • Impurity removal method for rare earth leaching solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 8m to the reactor 3 In the rare earth leaching solution (Fe:865mg / L, Al:1425mg / L, Si:177mg / L, pH:1.5), add 4kg activated carbon powder, open high-speed shear mixer, stirring speed is 3500rpm, then in the reactor with Add 3M ammonia solution by atomization, the feeding speed is 0.2m 3 / h. When the pH of the leachate rises to 5.2, continue to stir for 45 minutes, and control the pH at the end of the reaction to be 5.2; then feed 60% CO into the reactor. 2 Gas, the gas flow rate is 3.2m 3 / h, after continuing to react for 4h, the reaction can be terminated, and after liquid-solid separation, precipitation slag and rare earth purification solution are obtained, wherein the content of rare earth (rare earth total amount) in the precipitation slag (by dry weight) is 0.34% (weight). , the contents of iron, aluminum, and silicon in the rare earth purification solution are 3.7, 247.5, and 34.5 mg / L, respectively.

Embodiment 2

[0059] Add 8m to the reactor 3 In the rare earth leaching solution (Fe: 1308mg / L, Al: 907mg / L, Si: 204mg / L, pH: 1.2), add 5kg activated carbon powder, open the high-speed shear mixer, stirring speed is 5000rpm, then in the reaction kettle with Add 2.8M ammonium bicarbonate solution by atomization, the feeding speed is 0.35m 3 / h. When the pH of the leaching solution rises to 5.1, continue to stir for 80 minutes to control the pH at the end of the reaction to 5.1; then feed 75% CO into the reaction kettle. 2 Gas, the gas flow rate is 4.5m 3 / h, after continuing to react for 5h, the reaction can be terminated. After liquid-solid separation, precipitation slag and rare earth purification solution are obtained, wherein the rare earth content in the precipitation slag is 0.41%, and iron, aluminum, and silicon content in the rare earth purification solution are respectively 3.1, 285.7, 32.7mg / L.

Embodiment 3

[0065] Add 8m to the reactor 3 In the rare earth leaching solution (Fe:865mg / L, Al:1425mg / L, Si:177mg / L, pH:1.5), add 2kg activated carbon powder, open the high-speed shear mixer, stirring speed is 4000rpm, then in the reactor with Add 2.2M NaOH solution by atomization, the feeding speed is 0.12m 3 / h. When the pH of the leaching solution rises to 5.1, continue to stir for 60 minutes to control the pH at the end of the reaction to 5.1; then feed 90% CO into the reaction kettle 2 Gas, the gas flow rate is 5m 3 / h, after continuing to react for 3h, the reaction can be terminated. After liquid-solid separation, precipitation slag and rare earth purification solution are obtained, wherein the rare earth content in the precipitation slag is 0.44%, and the iron, aluminum and silicon contents in the rare earth purification solution are respectively 4.4, 266.4, 36.7mg / L.

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Abstract

The invention belongs to the field of non-ferrous metallurgy, and relates to an impurity removal method for a rare earth leaching solution. The method comprises the following steps of under the condition of adding seed crystals, adding alkali liquor into the rare earth leaching solution by adopting an atomization charging mode, precipitating to remove iron, aluminum and silicon impurities, after the alkali liquor is completely added, blowing CO2, continuously reacting for a certain time, and filtering to obtain a rare earth leaching solution with low impurity content and impurity precipitation slag with low rear earth content. The method has the advantages of being simple in process, low in cost, high in impurity removal rate, good in precipitated slag filtering performance, low in slag rare earth content and the like, and has a good industrial application prospect.

Description

technical field [0001] The invention relates to a method for removing impurities such as iron, aluminum and silicon from a rare earth leaching solution, belonging to the field of nonferrous metallurgy. [0002] technical background [0003] Rare earth elements are known as "industrial catalysts" and "vitamins of high-tech industries" because of their excellent magnetic, optical and electrical properties. my country is a big country in terms of rare earth resources and production, especially high-grade medium and heavy rare earths, which are unique in the world. According to reports, the global rare earth reserves are 120 million tons, and my country has 44 million tons, accounting for more than 38%. In 2018, the global output of rare earth mineral products was about 195,000 tons, and China's output was about 120,000 tons, accounting for 62%; the global rare earth smelting and separation output was about 146,000 tons, of which China's output was 125,000 tons, accounting for a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/44
CPCC22B59/00C22B3/44Y02P10/20
Inventor 李玉虎马艳丽贺欣豪陈金龙李云曹才放徐志峰
Owner JIANGXI UNIV OF SCI & TECH
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