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Method for selectively leaching rare earth elements from red mud

A rare earth element, selective technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylates, etc., can solve problems such as failure to be effectively recycled, and achieve the effect of effective separation

Active Publication Date: 2022-05-13
INST OF GEOCHEM CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, components with high content such as iron have not been effectively recycled.
From the above analysis, it can be seen that there are many methods for extracting rare earth metals from red mud at home and abroad, but few of them involve first recovering iron, and then selectively leaching from the residue of recovered iron to obtain a solution rich in rare earths.

Method used

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  • Method for selectively leaching rare earth elements from red mud

Examples

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Effect test

Embodiment 1

[0031] Dry and grind the red mud and pass through a 100-mesh sieve, weigh 50g of red mud, add 750mL of oxalic acid solution (concentration: 1mol / L), put it in a constant temperature water bath shaker and react (react at 75°C for 2h), and obtain red mud after filtration oxalic acid leaching slag and oxalic acid leaching solution; put the oxalic acid leaching slag of red mud into a muffle furnace for roasting, the roasting temperature is 520°C, and the roasting time is 0.5h. After taking it out, add 0.05mol / L diluted Hydrochloric acid, placed in a constant temperature water bath oscillator to react (reaction at room temperature for 2.5h), filtered to obtain hydrochloric acid leaching residue and hydrochloric acid leaching solution of red mud; finally add 1mol / L sulfuric acid solution (liquid-solid ratio 5mL / g), placed in a constant temperature water bath shaker at 95°C to react for 3 hours, and filtered to obtain a sulfuric acid leaching solution rich in rare earth elements.

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Embodiment 2

[0034] Dry and grind the red mud and pass through a 100-mesh sieve, weigh 50g of red mud, add 750mL of oxalic acid solution (concentration: 1mol / L), put it in a constant temperature water bath shaker and react (react at 75°C for 2h), and obtain red mud after filtration oxalic acid leaching slag and oxalic acid leaching solution; put the oxalic acid leaching slag of red mud into a muffle furnace for roasting, the roasting temperature is 520°C, and the roasting time is 0.5h. After taking it out, add 0.05mol / L diluted Hydrochloric acid, placed in a constant temperature water bath oscillator to react (reaction at room temperature for 2.5h), filtered to obtain hydrochloric acid leaching residue and hydrochloric acid leaching solution of red mud; finally add 1mol / L sulfuric acid solution (liquid-solid ratio 10mL / g), placed in a constant temperature water bath shaker at 95°C to react for 0.5h, and filtered to obtain a sulfuric acid leaching solution rich in rare earth elements.

[0...

Embodiment 3

[0037] Dry and grind the red mud and pass through a 100-mesh sieve, weigh 50g of red mud, add 750mL of oxalic acid solution (concentration: 1mol / L), put it in a constant temperature water bath shaker and react (react at 75°C for 2h), and obtain red mud after filtration oxalic acid leaching slag and oxalic acid leaching solution; put the oxalic acid leaching slag of red mud into a muffle furnace for roasting, the roasting temperature is 520°C, and the roasting time is 0.5h. After taking it out, add 0.05mol / L diluted Hydrochloric acid, placed in a constant temperature water bath oscillator to react (reaction at room temperature for 2.5h), filtered to obtain hydrochloric acid leaching residue and hydrochloric acid leaching solution of red mud; finally add 1mol / L sulfuric acid solution (liquid-solid ratio 10mL / g), placed in a constant temperature water bath shaker at 95°C to react for 4 hours, and filtered to obtain a sulfuric acid leaching solution rich in rare earth elements.

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Abstract

The invention relates to the technical field of rare earth element recovery, in particular to a method for selectively leaching rare earth elements from red mud. Comprising the following steps: leaching the red mud with an oxalic acid solution, and carrying out solid-liquid separation to obtain oxalic acid leaching residues and an oxalic acid leaching solution; roasting the oxalic acid leaching residues, leaching with a diluted hydrochloric acid solution, and carrying out solid-liquid separation to obtain hydrochloric acid leaching residues and a hydrochloric acid leaching solution; and leaching the hydrochloric acid leaching residues by using a sulfuric acid solution, and then carrying out solid-liquid separation to obtain a leaching solution rich in rare earth and sulfuric acid leaching residues. According to the method for extracting the rare earth elements in multiple stages through oxalic acid, diluted hydrochloric acid and sulfuric acid, the technical purposes that iron extraction, calcium removal and selective leaching of the rare earth elements from the red mud are achieved, the leaching rate of the rare earth elements is 80% or above, and the leaching rate of iron, aluminum and silicon elements is 20% or below are achieved.

Description

technical field [0001] The invention relates to the technical field of recovery of rare earth elements, in particular to a method for selectively leaching rare earth elements from red mud. Background technique [0002] Because of their excellent magnetic, optical and electrical properties, rare earth elements have excellent effects in greatly improving the quality and performance of other products, and are widely used in metallurgy, military affairs, material chemical industry and other fields. Red mud is a solid waste generated during the production of alumina from bauxite, and 1-1.5 tons of red mud is discharged for every ton of alumina produced. Most of the bauxite in my country is karst bauxite mainly composed of diaspore, which has a high content of associated rare earth elements. After extraction of alumina, the content of rare earth elements in the discharged red mud is twice that of bauxite. It has comprehensive utilization potential. [0003] A variety of methods f...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B1/02C22B59/00C07C51/41C07C55/07
CPCC22B7/04C22B7/007C22B7/001C22B1/02C22B59/00C07C51/412C07C55/07Y02P10/20
Inventor 顾汉念李宛研杨永琼王宁李泽海
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI
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