Method for strengthening leaching of weathering crust elution-deposited rare earth ore by utilizing additive

A weathering crust leaching type and additive technology is applied in the direction of improving process efficiency, which can solve the problems of troublesome rare earth element separation, impurity element dissolution, limited effect, etc., and achieves reduction of ammonia nitrogen and salt ion pollution, easy raw materials, and low cost. Effect

Inactive Publication Date: 2021-06-25
CENT SOUTH UNIV
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Problems solved by technology

However, there are still disadvantages such as environmental pollution, high cost, and limited effect, and often lead to th...

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  • Method for strengthening leaching of weathering crust elution-deposited rare earth ore by utilizing additive

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Effect test

Embodiment 1

[0023] Take 200g of dried weathering crust elution-type rare earth ore with a rare earth grade of 0.12%, and put the ore sample into a leaching column. Prepare a mixed solution with an ammonium sulfate leaching agent of 0.05mol / L and a malic acid additive concentration of 0.05mol / L, adjust the pH of the mixed solution to 3.0, and then use the mixed solution at a liquid-solid ratio of 7:1 to carry out column leaching of the ore sample The experiment was leached for 5 hours to obtain a rare earth leaching solution. The rare earth leaching solution was tested by an inductively coupled plasma spectrometer and the leaching rate was calculated. The leaching rate of the final rare earth ore sample was 99.5%, and the leaching rate of impurity aluminum was 24.7%.

Embodiment 2

[0025] Take 200g of dried weathering crust elution-type rare earth ore with a rare earth grade of 0.12%, and put the ore sample into a leaching column. Prepare a mixed solution with a magnesium sulfate leaching agent of 0.03mol / L and a citric acid additive concentration of 0.05mol / L, adjust the pH of the mixed solution to 3.0, and then conduct column leaching of the ore sample with the mixed solution at a liquid-solid ratio of 2:1 The experiment was leached for 5 hours to obtain a rare earth leaching solution. The rare earth leaching solution was tested by an inductively coupled plasma spectrometer and the leaching rate was calculated. The leaching rate of rare earth ore samples was 97.5%, and the leaching rate of impurity aluminum was 25.1%.

Embodiment 3

[0027] Take 200g of dried weathering crust elution-type rare earth ore with a rare earth grade of 0.12%, and put the ore sample into a leaching column. Prepare a mixed solution with an ammonium chloride leaching agent of 0.04mol / L and a lactic acid additive concentration of 0.07mol / L, and adjust the pH of the mixed solution to 3.0; then use the mixed solution at a liquid-solid ratio of 1:1 to conduct column leaching of the ore sample The experiment was leached for 5 hours to obtain a rare earth leaching solution. The rare earth leaching solution was tested by an inductively coupled plasma spectrometer and the leaching rate was calculated. The leaching rate of rare earth ore samples was 98.7%, and the leaching rate of impurity aluminum was 23.2%.

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Abstract

The invention discloses a method for strengthening leaching of weathering crust elution-deposited rare earth ore by utilizing an additive. The method comprises the following steps of: preparing a salt ion leaching agent and the additive into an aqueous solution according to a set concentration, then adjusting the pH of the solution to obtain a leaching solution, and then performing column leaching on the weathering crust elution-deposited rare earth ore by using the leaching solution to obtain a leaching solution containing rare earth elements. The method disclosed by the invention improves the leaching efficiency of rare earth ions, effectively reduces the use concentration and the use amount of the salt ion leaching agent, and reduces ammonia nitrogen and salt ion pollution; by adding small molecular organic acid, the dissolution of impurity elements can be inhibited, the subsequent impurity removal process is simplified, and the separation efficiency of the rare earth elements in the subsequent leaching solution is improved; and the additive adopted in the method has the advantages of environmental protection, low cost, high efficiency, easily available raw materials and the like, is beneficial to ecological restoration and improvement, and has a relatively good application value.

Description

technical field [0001] The invention belongs to the technical field of extraction of rare earth minerals, and in particular relates to a method for strengthening the leaching of weathering crust leaching type rare earth ores by using additives. Background technique [0002] The weathering crust leaching type (ion type) rare earth ore is an important rare earth mineral resource, and the main mineral phase is clay mineral. Weathering crust elution-type rare earth ores are mainly distributed in Jiangxi, Guangdong, Guangxi and other provinces in southern my country. They have a complete distribution of rare earths, especially rich in medium and heavy rare earth elements. They are precious and characteristic strategic mineral resources in my country. At present, ammonium salt in-situ leaching process is commonly used in industry to recover rare earths, that is, ammonium sulfate is used as the leaching agent to in-situ leach the rare earths in weathering crust leaching type rare e...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/16C22B3/08C22B3/10
CPCC22B3/08C22B3/10C22B3/165C22B59/00Y02P10/20
Inventor 申丽赵红波张麓原张叶娟邱冠周
Owner CENT SOUTH UNIV
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