Leaching-purifying method for rare earth concentrate

A rare earth concentrate and leaching technology, which is applied in the field of non-ferrous metallurgy, can solve the problems of poor impurity removal effect, low filtration efficiency, and large loss of rare earth, and achieve the effect of high impurity removal depth, quality improvement, and low equipment requirements

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

[0009] In order to solve many shortcomings such as poor impurity removal effect, large rare earth loss, and low filtration efficiency in the prior art, the purpose of the present invention is to provide a leaching-purification method for rare earth concentrates, which aims to provide a method that can improve the leaching effect. And can realize the method of self-purification function

Method used

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  • Leaching-purifying method for rare earth concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] One-stage leaching: first measure 500mL water into a 2L beaker, then add 0.5kg rare earth concentrate (TREO: 57.42%, Fe: 1.2%, Al: 0.28%, SiO 2 :.2.33%) and 4g activated carbon powder (seed), then start stirring to form the bottom liquid, then add the first leaching agent (hydrochloric acid and the mixed solution of the second-stage leaching solution used in circulation in the form of spraying), and in the mixed solution, The concentration of hydrochloric acid is 0.5M), the feeding rate of the leaching agent is 6L / h, and the pH at the end point is 5.2. After the feeding is completed, continue to stir the reaction until the temperature of the feed liquid drops below 50°C, then filter, and separate a section of leaching solution and a section of leaching residue. The filtration time was 38 minutes. A section of leachate was sampled and tested, and the concentrations of iron, aluminum, and silicon in a section of leachate were measured to be 1.1, 246.2, and 32.6 mg / L, resp...

Embodiment 2

[0056] One-stage leaching: First measure 500mL of water into a 2L beaker, then add 0.5kg of rare earth concentrate (TREO: 51.67%, Fe: 2.47%, Al: 0.34%, SiO 2 :.1.58%) and 5g graphite powder (seed crystal), then start stirring to form the bottom liquid, then add hydrochloric acid concentration as the first leaching agent of 1.0M in the form of spraying, the feeding speed of the leaching agent is 4.5L / h, the end point pH is 5.3. After the feeding is completed, continue to stir the reaction until the temperature of the feed liquid drops below 50°C, then filter, and separate a section of leaching solution and a section of leaching residue. The filtration consumption time was 32min. A section of the leachate was sampled and tested, and the concentrations of iron, aluminum, and silicon in the section of leachate were measured to be 0.9, 201.8, and 27.5 mg / L, respectively.

[0057] Second-stage leaching: Weigh 0.8kg of the first-stage leaching residue (H 2 (0:38%), measure 400mL wa...

Embodiment 3

[0064] One-stage leaching: First measure 500mL of water into a 2L beaker, then add 0.6kg of rare earth concentrate (TREO: 51.67%, Fe: 2.47%, Al: 0.34%, SiO 2 :.1.58%) and 3g graphite powder (seed), then start stirring to form the bottom liquid, then add hydrochloric acid concentration in the form of atomization and be the first leaching agent of 0.8M, the feeding speed of the leaching agent is 3.6L / h, and the terminal pH is 5.2. After the feeding is completed, continue to stir the reaction until the temperature of the feed liquid drops below 50°C, then filter, and separate a section of leaching solution and a section of leaching residue. The filtration consumption time was 44min. A section of leachate was sampled and tested, and the concentrations of iron, aluminum, and silicon in a section of leachate were measured to be 1.4, 279.8, and 46.8 mg / L, respectively.

[0065] Second-stage leaching: weigh 1.1kg of the first-stage leaching residue (H 2 (0:33%), measure 550mL water ...

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Abstract

The invention relates to a leaching-purifying method for rare earth concentrate, and belongs to the field of non-ferrous metallurgy. According to the method, a leaching process is adjusted, and a two-stage reverse feeding countercurrent process is adopted, namely, in first-stage leaching, rare earth concentrate slurry is used as a base solution, and a leaching agent is added into the base solution, so that low-impurity rare earth leaching liquid is obtained; in second-stage leaching, first-stage leaching residues serve as raw materials, after a certain number of seed crystals are added, a leaching agent hydrochloric acid is added into the first-stage leaching residues, so that the leaching residues low in rare earth content and an acid leaching solution high in impurity content are obtained, and the acid leaching solution is returned to the first-stage leaching for use; and by means of the leaching process, separation of impurities can be achieved, and rare earth resources can be fully utilized. The method has the advantages of being simple in process, low in cost, high in impurity removal rate, high in rare earth recovery rate and the like, and has good industrial application prospects.

Description

technical field [0001] The invention relates to a leaching-purification method of rare earth concentrate, which belongs to the field of nonferrous metal metallurgy. [0002] technical background [0003] Because of their excellent magnetic, optical and electrical properties, rare earth elements are widely used in new materials, aerospace, electronic information, machinery manufacturing, chemical industry, military and other fields, and are known as "vitamins of high-tech industries". , Processing research has always been a hot topic in industry and academia. 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 ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/06C22B3/44
CPCC22B59/00C22B3/06C22B3/44Y02P10/20
Inventor 李玉虎贺欣豪马艳丽刘志楼陈金龙李云徐志峰
Owner JIANGXI UNIV OF SCI & TECH
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