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Efficient full-interface pump leaching method for acid-process rare-earth roasted ore

A technology of leaching and rare earth, applied in the field of hydrometallurgy, can solve the problems of long process flow, equipment, labor, energy consumption cost and large floor area, so as to improve process efficiency, increase REO dissolution rate, and optimize acid-soluble conditions Effect

Active Publication Date: 2016-03-30
NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second and third steps of the washing process also use multi-stage continuous leaching tanks, each step of washing takes 30-40 minutes, and the solid-liquid separation takes 30-40 minutes
It can be seen from the above process that the existing process is relatively long, and the cost of equipment, labor, energy consumption, and floor area are relatively large.
As the daily processing volume of concentrate increases, this process brings a great burden to the enterprise

Method used

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  • Efficient full-interface pump leaching method for acid-process rare-earth roasted ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The acid-processed rare earth roasted ore and water were mixed according to the solid-to-liquid weight ratio of 1:6 and leached for 40 minutes, the leaching temperature was 25°C, and the pH value of the leaching slurry was 2.5. The leached slurry is separated by gravity settling to obtain fine-grained slurry and coarse-grained slurry. The coarse-grained slurry is leached by a 4-stage high-efficiency full-interface pump, combined with a 3-stage tank buffer vortex leaching, and the leached slurry is combined with the fine-grained slurry for solid-liquid separation. A 52.48g / l sulfuric acid rare earth feed solution and leaching residue were obtained, and the leaching residue was washed with dilute sulfuric acid. The pH value of the washing liquid was 0.3, and the dilute sulfuric acid was diluted with acid recovered from tail gas. The acid to slag solid-liquid weight ratio is 1:6, and the time is 10 minutes. 3.21g / l pickling solution and external slag were obtained by soli...

Embodiment 2

[0026] The hot roasted ore and water are mixed according to the solid-to-liquid weight ratio of 1:8, and the slurry is leached for 20 minutes. The leaching temperature is 38°C, and the pH value of the leaching slurry is 1.0~1.5. The leached slurry is separated by gravity settling to obtain fine-grained slurry and coarse-grained slurry. The coarse-grained slurry is leached by a 4-stage high-efficiency full-interface pump, combined with a 3-stage tank buffer vortex leaching, and the leached slurry is combined with the fine-grained slurry for solid-liquid separation. A 39.45g / l sulfuric acid rare earth feed solution and leaching residue were obtained, and the leaching residue was washed with dilute sulfuric acid, the pH of the washing liquid was 1.0, and the dilute sulfuric acid was diluted with acid recovered from tail gas. The acid to slag solid-liquid weight ratio is 1:8, and the time is 20 minutes. The pickling solution with REO content of 1.78g / l and the external slag were ...

Embodiment 3

[0028] The hot roasted ore and water were mixed according to the solid-to-liquid weight ratio of 1:7 and leached for 40 minutes, the leaching temperature was 39.5°C, and the pH value of the leaching slurry was 1.0-1.5. The leached slurry is separated by gravity settling to obtain fine-grained slurry and coarse-grained slurry. The coarse-grained slurry is leached by a 3-stage high-efficiency full-interface pump, combined with the 2-stage tank buffer eddy current leaching, and the leached slurry is combined with the fine-grained slurry for solid-liquid separation. A 44.89g / l sulfuric acid rare earth feed solution and leaching slag were obtained, and the leaching slag was washed with dilute sulfuric acid. The pH value of the washing liquid was 0.5~1.0, and the dilute sulfuric acid was prepared from concentrated sulfuric acid. The acid to slag solid-liquid weight ratio is 1:10, and the time is 20 minutes. The pickling liquid with REO content of 1.5g / l and the external slag were o...

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Abstract

The invention relates to an efficient full-interface pump leaching method for acid-process rare-earth roasted ore. The method is characterized by comprising the following steps: acid-process rare-earth roasted ore and water are mixed to form slurry; the slurry is leached; the leached slurry is subjected to gravitational settling separation to obtain fine grain slurry and coarse grain slurry; the coarse grain slurry is leached through multi-stage pump leaching in combination with multi-stage tank body buffering, wherein a primary pump is connected with a primary buffer tank, then the primary buffer tank is connected with a secondary pump, and so on; after the last pump realizes slurry leaching, the leached coarse grain slurry is combined with the fine grain slurry; solid-liquid separation is performed; the solution obtained after the separation is a sulfuric-acid rare-earth liquid, residues continue to be subjected to quick dilute-acid washing and solid-liquid separation to obtain an acid washing liquid and residues which are discharged outside; and rare earth roasted ore is leached circularly with the acid washing liquid. The method can effectively improve the leaching efficiency and leaching ratio of rare earth in the roasted ore, and saves equipment, energy, labor cost and the like.

Description

technical field [0001] The invention relates to a high-efficiency full-interface pump leaching method of rare earth roasted ore by acid method, which belongs to the technical field of hydrometallurgy. Background technique [0002] The concentrated sulfuric acid enhanced roasting and decomposition process is the main process for treating Baiyan Obo mixed rare earth concentrate, and the traditional multi-stage stirring and continuous leaching method is adopted for the water leaching of the roasted ore. More than 20 stages of 10m for one-step pulping and leaching 3 It takes about 4 hours for the left and right slurry tanks, 1 hour for solid-liquid separation, and the primary leaching rate of REO is only 90%. The second and third steps of the washing process also use multi-stage continuous leaching tanks. Each step of washing takes 30-40 minutes, and the solid-liquid separation takes 30-40 minutes. Therefore, the leaching process takes more than 5 hours, and the total leaching...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B59/00
CPCC22B3/08C22B59/00Y02P10/20
Inventor 崔建国马志鸿王荣郝肖丽侯睿恩张弓
Owner NAT ENG RES CENT OF RARE EARTH METALLURGY & FUNCTION MATERIALS
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