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Method for extracting rare earth from phosphate rock by utilizing liquid membrane

A phosphate rock and liquid membrane technology, applied in the direction of improving process efficiency, etc., can solve the problems of unsatisfactory extraction and separation of impurity ions, small extraction capacity of organic relative rare earth, large amount of extraction agent, etc., so as to reduce the amount of recycling, No environmental pollution and low production cost

Inactive Publication Date: 2012-01-04
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process has the following technical defects: (1) the extraction process needs to be acid-adjusted, and the pH value is adjusted to a specified range value to obtain a satisfactory extraction rate; (2) in order to improve the extraction effect of the rare earth in the neutral extraction system, A large amount of salting-out agent needs to be added; (3) the extraction efficiency is low, and the extraction and separation effect on impurity ions is not ideal; (4) the solution system is complex, the extraction capacity of organic relative rare earth is small, the amount of extraction agent used is large, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Rare earth phosphorus concentrate P 2 o 5 36.09%, REO 0.14%. The dosage of nitric acid is 1.8 times of the ore weight, the solid-liquid ratio is 1:4, the decomposition time is 1.0 hour, and the decomposition temperature is 65°C. Suction filtration is carried out after the decomposition is completed, and the filter residue is washed with warm water at 50-60°C to obtain a phosphate rock decomposition liquid. Dimethylheptyl methylphosphonate and surfactant N205 are mixed according to the volume ratio of 2:3, and the mixed solution is mixed with kerosene according to the volume ratio of 1:6 to obtain a membrane solution, and the membrane solution is mixed with a concentration of 0.02mol / L MHNO 3 The solutions are mixed according to the volume ratio of 1:1, and stirred at a high speed to obtain an emulsion liquid film. The high-speed stirring speed is 3000 rpm. Stirring time 20 minutes. Add the phosphate rock decomposition solution and the emulsion liquid film into th...

Embodiment 2

[0035] The composition of phosphorous concentrate remains unchanged. The amount of nitric acid is 0.8 times of the ore weight, the solid-liquid ratio is 1:3, the decomposition time is 2.0 hours, and the decomposition temperature is 80°C. Suction filtration is carried out after the decomposition is completed, and the filter residue is washed with warm water at 50-60°C to obtain a phosphate rock decomposition solution. Dimethylheptyl methylphosphonate and surfactant Span80 are mixed according to the volume ratio of 5:1, and the mixed solution is mixed with n-heptane according to the volume ratio of 1:10 to obtain a membrane solution, and the membrane solution is mixed with a concentration of 0.06mol / Intramembrane phase HNO of L 3 The solutions are mixed according to the volume ratio of 2:1, and stirred at a high speed to obtain an emulsion liquid film. The high-speed stirring speed is 2000 rpm. The stirring time was 30 minutes. Add the phosphate rock decomposition solution ...

Embodiment 3

[0037] The composition of phosphorous concentrate remains unchanged. The amount of nitric acid is 2.6 times of the ore weight, the solid-liquid ratio is 1:5, the decomposition time is 0.5 hour, and the decomposition temperature is 20°C. Suction filtration is carried out after the decomposition is completed, and the filter residue is washed with warm water at 50-60°C to obtain a phosphate rock decomposition solution. Dimethylheptyl methylphosphonate is mixed with surfactant N205+Span80 at a volume ratio of 1:5, and then mixed with n-heptane at a volume ratio of 1:4 to obtain a membrane solution, and the membrane solution is mixed with a concentration of 0.01mol / Intramembrane phase HNO of L 3 The solutions were mixed at a volume ratio of 1:2 and stirred at high speed to obtain an emulsion liquid film. The high-speed stirring speed is 4000 rpm. Stirring time 10 minutes. Add the phosphate rock decomposition solution and the emulsion liquid film into the extractor according to...

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Abstract

The invention belongs to the field of rare earth metallurgy, relates to an extraction of rare earth and provides a method for extracting rare earth from phosphate rock by utilizing a liquid membrane. The method comprises the following steps: mixing a neutral extracting agent with a surface active agent by the volume ratio of 5:1-1:5, mixing mixed liquid with kerosene by the volume ratio of 5:95-50:50 to prepare a mixed organic phase and mixing the mixed organic phase with a HNO3 solution by the volume ratio of 5:1-1:5 to finish the membrane preparation process; firstly adding phosphate decomposition liquid and an emulsion liquid membrane by the volume ratio of 500:15-200 into an extractor, then adding into a clarificator for demulsification after completion, and finally preparing rare earth oxide after precipitation and calcination by oxalic acid and oxalate. The purity of the rare earth oxide is more than 95 percent; and the total recovery rate of the rare earth oxide is more than 90 percent.

Description

technical field [0001] The invention belongs to the field of rare earth metallurgy, relates to the extraction of rare earths, and provides a method for extracting rare earth elements from phosphate rock containing rare earths by using a liquid film. Background technique [0002] Many phosphate rocks contain rare earth elements, and rare earth elements are mixed into calcium fluorophosphate or calcium phosphate minerals in the form of isomorphism instead of calcium. Because the rare earth grade is low, only about 0.1-0.2% (according to REO), and exists in mineral phase, it is a worldwide problem to extract rare earth elements from phosphorus concentrate. However, the rare earth reserves in phosphate concentrate are large, and the distribution of rare earth elements is good. For example, the rare earth distribution in Zhijin phosphate mine in Guizhou is medium-yttrium-rich and europium-rich, with reserves reaching 1.8 million tons, exceeding the weathering crust leaching-type ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/06C22B3/26
CPCY02P10/20
Inventor 杨幼明聂华平邓庚凤黄龙海卢博谢芳浩
Owner JIANGXI UNIV OF SCI & TECH
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