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Method for decomposing high-grade mixture rare earth concentrate through low-temperature roasting pretreatment of concentrated sulfuric acid

A technology of low-temperature pretreatment and mixed rare earth, which is applied in the field of rare earth concentrate decomposition, low-temperature pretreatment concentrated sulfuric acid roasting and decomposition of high-grade mixed rare earth concentrate, which can solve the problems of low energy consumption and waste residue reduction, and achieve the purpose of increasing the contact area, The effect of reducing the amount of waste residue and increasing process stability

Inactive Publication Date: 2019-07-26
李梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to use high-grade rare earth concentrate with less impurity content, and to decompose the rare earth concentrate by low-temperature concentrated sulfuric acid roasting, so as to successfully solve the problems of Th resource recovery, waste residue reduction, and lower energy consumption.

Method used

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  • Method for decomposing high-grade mixture rare earth concentrate through low-temperature roasting pretreatment of concentrated sulfuric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] combine figure 1 A method for roasting and decomposing high-grade mixed rare earth concentrate with low-temperature pretreatment concentrated sulfuric acid, specifically comprising the following steps:

[0036] S1: Take 10g of high-grade mixed rare earth concentrate and 20g of concentrated sulfuric acid, mix them evenly, and place them in a steel reactor for 5 minutes at room temperature. in,

[0037] The mixed rare earth concentrate in step (1) is one of bastnaesite and monazite or a mixed rare earth concentrate composed of the two. Rare earth grade REO≥58%, the best rare earth grade REO≥65%.

[0038] S2: Roast the obtained material at 300° C. for 2 hours to obtain concentrated sulfuric acid roasted ore.

[0039] S3: Combine the above concentrated sulfuric acid roasted ore with H 2After O is uniformly mixed, the solid-to-liquid ratio is 1:4, the stirring speed is 500r / min, the reaction temperature is 25°C, and the reaction time is 4h, filter to obtain water immersi...

Embodiment 2

[0052] On the basis of Example 1, combined with figure 1 A method for roasting and decomposing high-grade mixed rare earth concentrate with low-temperature pretreatment concentrated sulfuric acid, specifically comprising the following steps:

[0053] S1: Take 10g of high-grade mixed rare earth concentrate and 12g of concentrated sulfuric acid, mix them evenly, and then place them in a steel reactor for 30 minutes at room temperature. in,

[0054] The mixed rare earth concentrate in step (1) is one of bastnaesite and monazite or a mixed rare earth concentrate composed of the two. Rare earth grade REO≥58%, the best rare earth grade REO≥65%.

[0055] S2: Roasting the obtained material at 180° C. for 5 hours to obtain concentrated sulfuric acid roasted ore.

[0056] S3: Combine the above concentrated sulfuric acid roasted ore with H 2 After O is evenly mixed, the solid-to-liquid ratio is 1:2, the stirring speed is 600r / min, the reaction temperature is 30°C, and the reaction ti...

Embodiment 3

[0067] On the basis of the above examples, combined with figure 1 A method for roasting and decomposing high-grade mixed rare earth concentrate with low-temperature pretreatment concentrated sulfuric acid, specifically comprising the following steps:

[0068] S1: Take 10g of high-grade mixed rare earth concentrate and 25g of concentrated sulfuric acid and mix them evenly, then place them in a steel reactor for 3 minutes at room temperature. in,

[0069] The mixed rare earth concentrate in step (1) is one of bastnaesite and monazite or a mixed rare earth concentrate composed of the two. The rare earth grade REO≥58%, the best rare earth grade REO≥65%.

[0070] S2: Roasting the obtained material at 550° C. for 0.5 h to obtain concentrated sulfuric acid roasted ore.

[0071] S3: Combine the above concentrated sulfuric acid roasted ore with H 2 After O is uniformly mixed, the solid-liquid ratio is 1:6, the stirring speed is 100r / min, the reaction temperature is 10°C, and the re...

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Abstract

The invention discloses a method for decomposing high-grade mixture rare earth concentrate through low-temperature roasting pretreatment of concentrated sulfuric acid. The method is mainly characterized in that the high-grade mixture rare earth concentrate and the concentrated sulfuric acid are mixed in a certain proportion and are then placed in a steel stirrer to react in advance for a period oftime, and then low-temperature roasting is conducted to obtain concentrated sulfuric acid roasted ore; the concentrated sulfuric acid roasted ore and a certain proportion of H2O are mixed and then leached, so that aqueous leaching liquor and aqueous leaching residues are obtained, the aqueous leaching residues are washed with water to obtain aqueous washing residues and aqueous washing liquor, and the aqueous washing liquor is returned to continue to be used for water leaching of the concentrated sulfuric acid roasted ore; ammonium bicarbonate and diesel are added into the aqueous leaching liquor to obtain carbonic acid rare earth; and the carbonic acid rare earth reacts with hydrochloric acid to obtain acid leaching liquor, and the pH of the acid leaching liquor is regulated with ammonium hydroxide, so that ferrum-thorium residues and a qualified RECl3 solution are obtained. The low-temperature roasting method is adopted so that the ferrum-thorium residues can be economically and reasonably used.

Description

technical field [0001] The invention belongs to the field of clean and high-efficiency rare earth hydrometallurgy, and specifically relates to a new method for decomposing rare earth concentrates, in particular to a method for decomposing high-grade mixed rare earth concentrates by low-temperature pretreatment concentrated sulfuric acid roasting. Background technique [0002] Rare earth is a general term for 17 metal elements, which are neither rare nor earthy. Due to their special physical and chemical properties, rare earths are widely used in various important industries, such as aerospace, electronics, automobiles, rubber, etc. Rare earth is an important strategic resource in China. my country is a country with large rare earth resources and a large exporter. However, the production of rare earth has been stuck in the early high-temperature concentrated sulfuric acid roasting process. This process will not only produce a large amount of acid waste gas, but also "burn" Th...

Claims

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Application Information

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IPC IPC(8): C22B1/06C22B3/04C22B3/10C22B3/44C22B59/00C22B60/02
CPCC22B1/06C22B3/04C22B3/10C22B3/44C22B59/00C22B60/0291Y02P10/20
Inventor 李梅高凯张栋梁李健飞
Owner 李梅
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