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System and method for processing rare earth concentrates

A rare earth concentrate and rare earth technology, applied in the system field of rare earth concentrate processing, can solve the problems of large amount of caustic soda, a large amount of acid dissolution, three wastes, etc., and achieve the effects of low cost, reduced dilution, and simple process

Inactive Publication Date: 2017-05-10
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of serious "three wastes" in the existing technology of rare earth concentrate, large amount of caustic soda consumption and high cost, and subsequent process requires a large amount of acid to dissolve, etc.

Method used

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  • System and method for processing rare earth concentrates
  • System and method for processing rare earth concentrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] reference figure 1 with figure 2 , The weight ratio of phosphate ore rare earth concentrate, sodium carbonate, sodium chloride, pyrite concentrate (sulfide agent), and sodium humate (binder) with a REO content of 20% is 100:20:30 :2:5 Mix the ingredients in the batching device S100 and prepare pellets in the forming device S200 to prepare rare earth green pellets with a particle size of 12mm-16mm, and the pellets contain 2% water. The rare earth green pellets are roasted using a rotating bed roasting device S300, the roasting temperature is 900°C, and the residence time of the pellets in the rotating bed roasting device S300 is 30 minutes. Rotating bed roasting device S300 adopts gas radiant tube for closed radiant heating, and the air pressure in the furnace is controlled to be micro negative pressure -30pa~-50pa. After roasting, the hot pellets are directly sent from the rotating bed roasting device S300 to the water quenching device S400 for water quenching. 1% by w...

Embodiment 2

[0043] reference figure 1 with figure 2 , The fluorocarbonate rare earth concentrate, sodium carbonate, sodium chloride, sulfur (vulcanizing agent), sodium humate (binder) with a REO content of 48% are in a weight ratio of 100:5:100:30 : 7 Mix the ingredients in the batching device S100 and prepare pellets in the forming device S200 to prepare rare earth green pellets with a particle size of 8mm-12mm, and the pellets contain 3% water. The rare earth green pellets are roasted using a rotating bed roasting device S300, the roasting temperature is 800°C, and the residence time of the pellets in the rotating bed roasting device S300 is 60 minutes. Rotating bed roasting device S300 adopts gas radiant tube for closed radiant heating, and the air pressure in the furnace is controlled to a slight negative pressure of -10pa~-20pa. After roasting, the hot pellets are directly sent from the rotating bed roasting device S300 to the water quenching device S400 for water quenching, and 5% ...

Embodiment 3

[0045] reference figure 1 with figure 2 , Put the mixed rare earth concentrate, sodium carbonate, sodium chloride, sulfur (vulcanizing agent), and modified starch (binder) with a REO content of 60% in a weight ratio of 100:35:100:30:10 in the batching device The ingredients in S100 are mixed uniformly and pellets are prepared in the forming device S200 to prepare rare earth green pellets with a particle size of 6-10 mm, and the pellets contain 4% water. The rare earth green pellets are roasted using a rotating bed roasting device S300, the roasting temperature is 600°C, and the residence time of the pellets in the rotating bed roasting device S300 is 80 minutes. Rotating bed roasting device S300 adopts gas radiant tube for closed radiant heating, and the air pressure in the furnace is controlled to a slight negative pressure of -5pa~-10pa. After roasting, the hot pellets are directly sent from the rotating bed roasting device S300 to the water quenching device S400 for water ...

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Abstract

The invention discloses a system and method for processing rare earth concentrates. The method comprises the steps that the rare earth concentrates, sodium carbonate, a chloridizing agent, a vulcanizing agent and a bonding agent are blended in a blending device; then mixed materials are prepared into rare earth green pellets in a forming device; the rare earth green pellets are fed into a rotating packed bed to be calcinated to obtain hot pellets; then the hot pellets are subjected to water quenching, and calcium chloride is added for wet ore grinding in an ore grinding device to obtain ore pulp; and the ore pulp is subjected to filtration or suction filtration in a solid-liquid separation leaching device to obtain filter residues and a chloridized rare earth solution. By adoption of the system and method for processing the rare earth concentrates, the problems that in the prior art, three waste pollution is serious, caustic soda is large in dosage and high in cost, and a large amount of acid is needed for dissolution in subsequent processes are solved.

Description

Technical field [0001] The invention relates to the technical field of rare earth metallurgy, in particular to a system and method for processing rare earth concentrates. Background technique [0002] my country's rare earth reserves are the largest in the world. However, most of the proven rare earth mines are complex in composition and low in rare earth content, which is not conducive to direct industrial application. At present, the grade of mixed rare earth concentrate used in industrial production is generally 50% to 60%, while the rare earth content of the raw ore is much lower than this level, so it is necessary to effectively remove the gangue minerals and harmful impurities in the rare earth ore. After the rare earth concentrate is obtained by the beneficiation treatment, the rare earth is extracted. However, the rare earth phosphate mineral (monazite) contained in mixed rare earth minerals is very stable even under high temperature conditions, and it is even more diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244C22B1/02C22B59/00
CPCC22B1/02C22B1/2406C22B1/244C22B59/00Y02P10/20
Inventor 吴道洪陈文亮刘占华王欣王岩曹志成左晓鹏丁银贵
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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