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Weathering crust deposit type rare earth ore compound leaching agent

A weathering crust leaching type, rare earth ore technology, applied in the direction of improving process efficiency, can solve the problems of reducing clay ore, hindering the leaching process of rare earth, changing the hydrophilicity of clay minerals, etc., to achieve improved leaching, good anti-swelling Effect, effect of strong hydration swelling

Inactive Publication Date: 2015-06-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since quaternary ammonium surfactants tend to reduce the adsorption of water by clay minerals, they will change the hydrophilicity of clay minerals and hinder the leaching process of rare earths.

Method used

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  • Weathering crust deposit type rare earth ore compound leaching agent
  • Weathering crust deposit type rare earth ore compound leaching agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh 250.0g of the dried weathering crust elution-type rare earth ore and put it into a glass column, and prepare a composite leaching agent (mass concentration) according to the following components: di-n-propylamine hydrochloride 4g / L, ammonium chloride 6g / L , and use 2.0mol / L hydrochloric acid to adjust the pH of the solution to 4.5, and use this composite leaching agent to add to the column at a solid-to-liquid ratio of 1:2 (g:mL), and adjust the flow rate to 0.52mL / min. Column leaching was carried out for the accumulated rare earth ore, and the rare earth content in the leachate was detected with xylenol orange as an indicator under the condition of pH=5.5, and detected by EDTA volumetric method, and the calculated rare earth leaching rate was 93.66%;

[0029] Determination of clay mineral linear expansion rate:

[0030] Weigh 2.0g of the weathered crust elution-type rare earth ore after vacuum drying, keep the pressure at 8.0MPa, press the tablet on the tablet ma...

Embodiment 2

[0039] The implementation method is the same as in Example 1, and the composite leaching agent is prepared according to the following components: 1g / L di-n-propylamine hydrochloride, 5g / L ammonium chloride, and hydrochloric acid to adjust the pH of the solution to 4.0, and use this composite leaching solution to treat weathering shells. The column leaching of the leaching type rare earth ore was carried out, and the rare earth content of the leachate was detected. The rare earth leaching rate was 68.76%, and the expansion rate was 1.879%.

[0040] Di-n-propylamine hydrochloride is added as an anti-swelling agent, which has a synergistic effect with the leaching agent, and has good leaching effect and anti-swelling effect.

Embodiment 3

[0042] The implementation method is the same as in Example 1, and the composite leaching agent is prepared according to the following components: 15g / L di-n-propylamine hydrochloride, 30g / L ammonium chloride, hydrochloric acid to adjust the pH of the solution to 6.0, and use this composite leaching solution to treat weathering shells. The column leaching of the leaching type rare earth ore was carried out, and the rare earth content of the leachate was detected. The rare earth leaching rate was 95.41%, and the expansion rate was 2.010%.

[0043] Di-n-propylamine hydrochloride is added as an anti-swelling agent, which has a synergistic effect with the leaching agent, and has good leaching effect and anti-swelling effect.

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PUM

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Abstract

The invention belongs to the field of wet metallurgy and in particular discloses a compound leaching agent for preventing landslide in the process of leaching weathering crust deposit type rare earth ore in situ. The compound leaching agent consists of a mixed aqueous solution of an organic amine salt anti-swelling agent, a leaching agent and a pH regulator, wherein the concentration of the organic amine salt anti-swelling agent is 1-15g / L; the concentration of the leaching agent is 5-30g / L; the pH value of the mixed aqueous solution is regulated to be 4.0-6.0 by using the pH regulator. The compound leaching agent is preferably any one of dimethylamine hydrochloride, di-n-propylamine hydrochloride, diethylamine hydrochloride and triethylamine hydrochloride. Due to the addition of the anti-swelling agent, the compound leaching agent has the capacity of well preventing swelling of clay minerals, the rare earth leaching effect is not influenced, the leaching agent has the functions of leaching and preventing swelling, and landslide is effectively avoided in the process of leaching the weathering crust deposit type rare earth ore in situ.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a composite leaching agent for preventing landslides during in-situ leaching of weathering crust elution type rare earth ores. Background technique [0002] Weathering crust elution-type rare earth ore (also known as ion-adsorption rare earth ore) is a unique rare earth ore in my country. It is widely distributed in Jiangxi, Fujian, Guangdong, Hunan, Guangxi and other regions in southern China. Its rare earth composition is rich in medium and heavy rare earths. Elements are the main source of medium and heavy rare earths in my country and have huge commercial value. Weathering crust leaching type rare earth ores are clay minerals, mainly composed of kaolinite, halloysite, montmorillonite, etc. Clay ores are the loading phase of rare earths, and about 85% of rare earths are adsorbed on hydrated or hydroxyl hydrated ions. On the clay minerals, an ion exchange "resin" with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B3/04
CPCY02P10/20
Inventor 池汝安张婷婷徐志高张臻悦何正艳
Owner WUHAN INSTITUTE OF TECHNOLOGY
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