A method for complex separation and removal of aluminum from rare earth feed liquid

A rare earth material liquid, complexation separation technology, applied in the fields of chemistry, hydrometallurgy, and materials, can solve the problems of difficult filtration and separation of flocculent precipitates, the influence of rare earth leaching rate, and the expensive price of oxalic acid, etc., to achieve easy filtration and low equipment requirements , the effect of fast sedimentation rate

Active Publication Date: 2022-07-29
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the removal of aluminum in the leaching stage requires precise control of the pH value, which is difficult in experiments and has a greater impact on the leaching rate of rare earths; too high alkalinity in the alkaline method of aluminum removal requires strict equipment requirements, and excessive Alkaline waste liquid has a great impact on the environment; although the process of removing aluminum by neutralization is simple, the precipitate formed is Al(OH) 3 It is very difficult to filter and separate flocculent precipitates; the oxalic acid precipitation method is only suitable for rare earth feed solutions with low aluminum ion content, and oxalic acid is expensive and unfriendly to the environment; the extraction method is currently widely used in industrial applications from leachate The method of removing aluminum in the medium, but it needs to adjust the pH accurately, it is difficult to implement, and the emulsification phenomenon is easy to occur when the concentration of aluminum ions is high

Method used

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  • A method for complex separation and removal of aluminum from rare earth feed liquid
  • A method for complex separation and removal of aluminum from rare earth feed liquid
  • A method for complex separation and removal of aluminum from rare earth feed liquid

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Effect test

specific Embodiment 1

[0035] (1) Rare earth feed solution: aluminum content 2g / L, rare earth content 5g / L, solution pH=-0.03.

[0036] (2) Pipette 100mL of rare earth feed liquid into a 300mL conical flask, put it into a constant temperature water bath with magnetic stirring, weigh 7.224g of 3-hydroxyphenylphosphoryl propionic acid and slowly add it to the conical flask under constant temperature stirring at 50°C , after stirring for 5 minutes after the feeding is finished, add buffer solution of ammonia and ammonium chloride to slowly adjust the pH=1 of rare earth solution, continue stirring for 10 minutes, and then vacuum filter to obtain precipitate and filtrate. Through the above operations, the precipitation rate of aluminum is 9.52%, and the precipitation rate of rare earth is 90.48%, and the separation of rare earth and aluminum is achieved to a certain extent.

specific Embodiment 2

[0037] (1) Rare earth feed solution: aluminum content 1g / L, rare earth content 5g / L, solution pH=-0.03.

[0038] (2) Pipette 100mL of rare earth feed liquid into a 300mL conical flask, put it into a constant temperature water bath with magnetic stirring, weigh 7.224g of 2-[hydroxy(phenyl)phosphoryl]acetic acid and slowly add it under constant temperature stirring at 30°C In the conical flask, after the feeding is completed, stirring for 10 minutes and dissolving evenly, adding ammonia water and a buffer solution of ammonium chloride to slowly adjust the pH of the rare earth solution to 1, continuing to stir for 10 minutes, and then vacuum filtration to obtain a filtrate. Through the above operations, the precipitation of aluminum in the solution The rate of rare earth is 9.97%, the precipitation rate of rare earth is 90.48%, and the rare earth and aluminum ions are effectively separated.

specific Embodiment 3

[0039] (1) Rare earth feed solution: aluminum content 5g / L, rare earth content 5g / L, solution pH=-0.03.

[0040](2) Pipette 100mL of rare earth feed liquid into a 300mL conical flask, put it into a constant temperature water bath with magnetic stirring, weigh 7.224g of sodium 3-hydroxyphenylphosphoryl propionate and slowly add it to the conical flask under constant temperature stirring at 50°C , after stirring for 15 minutes after the feeding is completed, add the buffer solution of ammonia water and ammonium chloride to slowly adjust the pH=1 of the rare earth solution, and continue to stir for 10 minutes to obtain the filtrate by vacuum filtration. Through the above operations, the precipitation rate of aluminum in the solution is 2.03%. , the precipitation rate of rare earth is 90.48%, which can effectively separate rare earth from aluminum.

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Abstract

The invention discloses a method for complex separation and removal of aluminum from rare earth feed liquid. One of them is used as a complex separation agent to treat the rare earth feed liquid, and the rare earth ions contained in the rare earth solution are separated from the rare earth solution in the form of precipitation. By controlling the amount of complex separating agent, reaction temperature, pH value of the solution, and reaction time, the precipitation rate of rare earth in the rare earth feed liquid can reach more than 90%, while the precipitation rate of aluminum ions does not exceed 10%. Compared with the prior art, the complex separation method for separating aluminum from rare earth solution has low equipment requirements, simple operation, easy filtration of the obtained precipitate, and recycling of the recovered product through regeneration. Reduce environmental impact and lower disposal costs.

Description

technical field [0001] The invention relates to the technical fields of hydrometallurgy, chemistry and materials, in particular to a method for complex separation and removal of aluminum from rare earth feed liquid. Background technique [0002] The weathering crust leaching-type rare earth ore discovered in the southern region is a low-radioactive, medium-heavy, and special rare earth ore that is only owned by China. Rare earth resources adsorbed on clay etc. The mineral phase structure of this ore is special and cannot be processed by traditional physical beneficiation process. At present, in-situ leaching of ammonium sulfate solution is mostly used, but a large amount of impurity ions will also be leached during the leaching process. It also has unique amphoteric properties, which almost accompanies the entire rare earth production process. For example, when ammonium salt is used for leaching, a large amount of aluminum ions are leached, and a large amount of leaching ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/44
CPCC22B59/00C22B3/44Y02P10/20
Inventor 李金辉王玉冬徐志峰王瑞祥刘晋彪
Owner JIANGXI UNIV OF SCI & TECH
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