Method for separating rare earth and aluminum from ionic rare earth mine leachate

An ionic rare earth and leaching solution technology, which is applied in the field of separation of rare earth and aluminum, can solve the problems of high residual aluminum and large loss of rare earth, and achieve the effects of simple operation, improved recovery rate, and improved utilization rate

Active Publication Date: 2022-04-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for separating rare earth and aluminum from the leaching solution of ionic rare earth mines, aiming to solve the technical problems of large loss of rare earth and high residual aluminum in the existing leaching solution of ionic rare earth mines.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The mass concentrations of rare earth and aluminum in ionic rare earth mine leachate are 1.94g / L and 0.68g / L respectively. Take 50L mine leachate and add ammonium bicarbonate to adjust the pH of the solution to 7.5. Precipitation is formed. After standing for a certain period of time, filter and wash The filter residue S1 can be obtained. Filter residue S1 is mixed with NaOH, the amount of NaOH added (as Na 2 O) and Al in slag 2 o 3 The molar ratio of the mixture is 1.5:1, and after mixing evenly, place it in a muffle furnace at 400°C for 1.5 hours to obtain roasted slag S2. The roasted slag S2 was leached in an aqueous solution, the liquid-solid ratio of the leaching process was 5, the temperature was 60°C, the stirring time was 2 hours, and the stirring speed was 200 r / min. After the reaction, filter and wash to obtain the filter residue S3 and the filtrate L1. During the process, the recovery rate of rare earth was 95.8%, and the removal rate of aluminum was 96.8...

Embodiment 2

[0026] The mass concentrations of rare earth and aluminum in ionic rare earth mine leachate are 1.52g / L and 0.36g / L respectively. Take 50L mine leachate and add ammonium bicarbonate to adjust the pH of the solution to 9.0. Precipitation is formed. After standing for a certain period of time, filter and wash The filter residue S1 can be obtained. Filter residue S1 with NaOH and Na 2 CO 3 Mixed, NaOH and Na 2 CO 3 The molar ratio is 5, the amount of alkali added (as Na 2 O) and Al in slag 2 o 3 The molar ratio of the mixture is 1.8:1, and after mixing evenly, place it in a muffle furnace at 500°C for calcination for 40 minutes to obtain calcination slag S2. The roasted slag S2 was leached in an aqueous solution with a liquid-solid ratio of 4, a temperature of 80°C, a stirring time of 1.5 h, and a stirring rate of 300 r / min. After the reaction, filter and wash to obtain the filter residue S3 and the filtrate L1. During the process, the recovery rate of rare earth was 97.2...

Embodiment 3

[0028] The mass concentrations of rare earth and aluminum in ionic rare earth mine leachate are 1.12g / L and 0.49g / L respectively. Take 50L of mine leachate and add ammonium bicarbonate to adjust the pH of the solution to 10.5. Precipitation is formed. After standing for a certain period of time, filter and wash The filter residue S1 can be obtained. Filter residue S1 is mixed with NaOH, the amount of NaOH added (as Na 2 O) and Al in slag 2 o 3 The molar ratio of the mixture is 2.1:1, and after mixing evenly, place it in a muffle furnace at 600°C for 30 minutes for calcination to obtain calcination slag S2. The roasted slag S2 was leached in an aqueous solution, the liquid-solid ratio of the leaching process was 3, the temperature was 90°C, the stirring time was 1 h, and the stirring speed was 250 r / min. After the reaction, filter and wash to obtain the filter residue S3 and the filtrate L1. During the process, the recovery rate of rare earth was 98.5%, and the removal rate...

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Abstract

The invention discloses a method for separating rare earth and aluminum from ionic rare earth mine leachate. The method comprises the following steps: precipitating the mine leachate obtained by in-situ leaching of ammonium sulfate by adding excessive carbonate; adding alkali into the obtained precipitate, mixing, and roasting to convert aluminum-containing impurities into sodium metaaluminate; the roasted slag sample is washed with hot water, sodium metaaluminate is dissolved in water and enters the solution, and the residual slag phase is the rare earth oxide. According to the preparation method, the rare earth and the aluminum-containing impurities are co-precipitated, then alkali is added for roasting to transform the aluminum-containing impurities, and then the rare earth oxide is obtained through washing and aluminum removal, so that the preparation method has the advantages of being short in process, simple to operate, high in rare earth recovery rate and high in aluminum removal efficiency.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a method for separating rare earth and aluminum from ion-type rare earth mine leachate. Background technique [0002] The medium-heavy rare earth elements rich in ionic rare earth ores are widely used in the fields of national defense and military industry, new materials, aerospace and other fields because of their excellent optical, electrical, and magnetic properties. They are strategic resources in my country. [0003] At present, in the leaching solution obtained by using in-situ leaching technology to treat ionic rare earth ores, the content of rare earth (calculated as REO) can reach more than 1g / L, while Al 3+ The concentration also reaches about 0.5g / L. During the rare earth precipitation and enrichment process, due to the close pH of rare earth and aluminum precipitation, the content of aluminum-containing impurities in the rare earth precipitation wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B21/00C22B3/44C22B3/04C22B1/02
CPCY02P10/20
Inventor 牛飞刘桂华潘军申雷霆齐天贵
Owner CENT SOUTH UNIV
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