Method for removing aluminum from rare earth material solution by organic acid complexation and solid-phase adsorption

A technology of solid-phase adsorption and rare earth feed liquid, which is applied in the fields of chemistry, hydrometallurgy, and materials, can solve the problems of difficult separation of rare earth and aluminum, and achieve the effect of reducing the concentration

Active Publication Date: 2019-01-11
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the problem of difficult separation of rare earth and aluminum in rare earth feed liquid, the present invention provides a method for r...

Method used

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  • Method for removing aluminum from rare earth material solution by organic acid complexation and solid-phase adsorption

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Rare earth concentrate hydrochloric acid leaching solution: aluminum content 0.96g / L (as Al 2 o 3 ), the rare earth content is 92 g / L (based on REO), and the pH of the solution is 1.5.

[0034] (2) Pipette 100mL of leachate into a 300mL Erlenmeyer flask, put it into a constant temperature water bath with magnetic stirring, weigh 5.5291g of sodium citrate into the Erlenmeyer flask, stir and react at a constant temperature of 20°C for 60min, then add 10% NaOH The solution slowly adjusts the pH of the rare earth solution to 3.0.

[0035] (3) Add 0.2g of activated carbon into the solution, shake it at constant temperature for 30 minutes, and then filter it. The aluminum content in the solution after adsorption is 0.13g / L, the removal rate of aluminum is 85%, and the loss of rare earth is 4.7%.

Embodiment 2

[0037] (1) Rare earth concentrate hydrochloric acid leaching solution: aluminum content 1.68g / L (as Al 2 o 3 ), the rare earth content is 78 g / L (based on REO), and the pH of the solution is 1.5.

[0038] (2) Pipette 100mL of leaching solution into a 300mL Erlenmeyer flask, put it into a constant temperature water bath with magnetic stirring, weigh 4.5628 g of citric acid and add it to the Erlenmeyer flask, stir and react at a constant temperature of 30°C for 90min, add ammonia water to slowly adjust the rare earth solution pH=3.5.

[0039] (3) Add 0.35g of porous polyvinylbenzene resin into the solution, shake it at constant temperature for 45 minutes, and then filter it. The aluminum content in the solution after adsorption is 0.16g / L, the removal rate of aluminum is 90%, and the loss of rare earth is 4.9%.

Embodiment 3

[0041] (1) Rare earth concentrate hydrochloric acid leaching solution: aluminum content 1.178g / L (as Al 2 o 3 ), the rare earth content is 100 g / L (based on REO), and the pH of the solution is 2.0.

[0042] (2) Pipette 100mL of leaching solution into a 300mL Erlenmeyer flask, put it into a constant temperature water bath with magnetic stirring, weigh 15.18 g of disodium citrate and add it to the Erlenmeyer flask, stir at 40°C for 120min, add ammonia water to slowly adjust Rare earth solution pH=3.5.

[0043] (3) Add 0.3g of activated carbon into the solution, react with constant temperature oscillation for 60min, and then filter. The aluminum content in the solution after adsorption is 0.24g / L, the removal rate of aluminum is 80%, and the loss of rare earth is 3.6%.

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Abstract

The invention discloses a method for removing aluminum from rare earth material solution by organic acid complexation and solid-phase adsorption, which includes such steps as chelating reaction between citrate radical and aluminum ions in the rare earth material solution, adsorbing aluminum citrate by utilizing porous characteristics of porous polyethylene styrene resin and activated carbon, fixing aluminum ions on the surface of an adsorbent, and removing aluminum from the rare earth material solution. The removal rate of aluminum ions is 80% or above and the loss rate of rare earth is no more than 5%. Compared with other existing technologies, the existing method has low requirements on equipment, is easy to operate, and avoids the problem that aluminum hydroxide flocculent precipitationis difficult to filter, and the existing adsorbent material can be recycled, thus reducing the production cost. The invention provides an extremely effective, economical and practical way for removing aluminum from the rare earth material solution.

Description

technical field [0001] The invention relates to a method for absorbing and removing aluminum from a rare earth feed solution by utilizing the solid-phase porous characteristics through organic acid complexation reaction aluminum, and belongs to the technical fields of hydrometallurgy, chemistry, materials and the like. Background technique [0002] Rare earth is an important strategic resource and is widely used in modern industry. There are many types of rare earth ores, and there are abundant ion-adsorption rare earth ores in the south of Jiangxi, Guangdong, Hunan, and Fujian. The main feature is that the content of radioactive elements is low. Because of its high content of medium and heavy rare earths, it has received extensive attention at home and abroad. The rare earths in the rare earth mines in the south are mainly adsorbed on the surface of clay minerals in the form of ions, and there are differences in the particle size, rare earth grade, and impurity content of ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/44C22B3/24
CPCC22B3/24C22B3/44C22B59/00Y02P10/20
Inventor 李金辉徐志峰
Owner JIANGXI UNIV OF SCI & TECH
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