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Decomposition method for rare earth ore concentrate

A rare earth concentrate and solid-liquid separation technology, applied in the direction of improving process efficiency, etc., can solve the problems of large amount of waste residue, uneven reaction, acid waste gas, etc., to reduce waste gas and waste residue, improve rare earth recovery rate, reduce The effect of high temperature roasting temperature

Active Publication Date: 2020-06-26
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it is easy to cause a large amount of solids to be consolidated on the inner wall of the roasting device, and the reaction is uneven; on the other hand, the process produces a lot of acid waste gas, and it is necessary to use graded water spray and concentrated sulfuric acid to absorb the waste gas
In addition, the amount of waste slag generated in this patent document is still relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 100kg of Baiyun Obo Rare Earth Concentrate (65.4% REO content, 9.2% F content, 2.14% P content) with 70wt% 800L concentrated sulfuric acid in a reactor, and then react at 160°C for 40min to obtain the reaction product.

[0034] Then the reaction product was filtered at 160° C. to obtain a first filter residue and a first filtrate.

[0035]The first filter residue was washed with 80° C. water for 5 min, and then filtered to obtain a second filter residue and a second filtrate. The weight ratio of the first filter residue to water is 1:8.

[0036] The second filter residue was soaked with water at 15° C. for 50 minutes, and then filtered to obtain a third filter residue and a third filtrate. The weight ratio of the second filter residue to water is 1:8. The third filtrate is the solution containing rare earth sulfate.

Embodiment 2

[0038] Mix 100kg of Baiyun Obo rare earth concentrate (REO content is 65.4%, F content is 9.2%, P content is 2.14%) and 75wt% 800L concentrated sulfuric acid in a reactor, and react at 160°C for 60min to obtain the reaction product.

[0039] Then the reaction product was filtered at 160° C. to obtain a first filter residue and a first filtrate.

[0040] Wash the first filter residue with water at 80° C. for 7 minutes, and then filter to obtain a second filter residue and a second filtrate. The weight ratio of the first filter residue to water is 1:8.

[0041] The second filter residue was soaked with water at 15° C. for 50 minutes, and then filtered to obtain a third filter residue and a third filtrate. The weight ratio of the second filter residue to water is 1:8. The third filtrate is the solution containing rare earth sulfate.

Embodiment 3

[0043] Mix 100kg of Baiyun Obo rare earth concentrate (REO content is 65.4%, F content is 9.2%, P content is 2.14%) and 75wt% 800L concentrated sulfuric acid in a reactor, and react at 160°C for 60min to obtain the reaction product.

[0044] Then the reaction product was filtered at 160° C. to obtain a first filter residue and a first filtrate.

[0045] Wash the first filter residue with water at 80° C. for 7 minutes, and then filter to obtain a second filter residue and a second filtrate. The weight ratio of the first filter residue to water is 1:8.

[0046] The second filter residue was soaked with water at 15° C. for 50 minutes, and then filtered to obtain a third filter residue and a third filtrate. The weight ratio of the second filter residue to water is 1:8. The third filtrate is the solution containing rare earth sulfate.

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Abstract

The invention discloses a decomposition method for rare earth ore concentrate. The decomposition method comprises the following steps that the rare earth ore concentrate and 65%-85wt% of concentratedsulfuric acid are mixed in a reaction container, and then react at 150-185 DEG C to obtain a reaction product, wherein the dosage ratio between the rare earth ore concentrate and the concentrated sulfuric acid is 1kg: (7.8-9) L, and the reaction container is not a roasting device; the reaction product is subjected to solid-liquid separation treatment to obtain a first filter residue and a first filtrate; and the first filter residue is washed with water, and then is subjected to solid-liquid separation treatment to obtain a second filter residue and a second filtrate. According to the decomposition method, the generation of waste gas and waste residues is reduced while the high rare earth recovery rate can be kept.

Description

technical field [0001] The invention relates to a decomposition method of rare earth concentrate, in particular to a decomposition method of Baiyan Obo rare earth concentrate. Background technique [0002] At present, the grade of rare earth concentrate commonly used in industry is 30-60%. For the decomposition treatment of the rare earth concentrate, concentrated sulfuric acid intensified roasting process is generally used. The roasting process has the characteristics of wide application range of rare earth grades and low processing cost, and has become one of the mainstream processes for processing rare earth ores. The roasting process requires the introduction of supporting gas (including natural gas or air), the roasting temperature is high, and the concentrated sulfuric acid will decompose, resulting in a large amount of roasting tail gas. Roasting 1 ton of rare earth concentrate usually produces 10000m 3 Left and right roasting exhaust gas. Roasting tail gas is bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/22C22B59/00
CPCC22B3/08C22B3/22C22B59/00Y02P10/20
Inventor 候少春刘威赵永志赵拓笪宗扬丁艳蓉宋静
Owner BAOTOU RES INST OF RARE EARTHS
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