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Method of treating rare earth ore concentrate by adopting revolving bed

A rare earth concentrate and rotating bed technology, applied in the direction of improving process efficiency, can solve the problems of "three wastes", large amount of caustic soda and high cost, and achieve the effects of simple process, improved total rare earth yield and low cost

Active Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the above-mentioned problems existing in the prior art, in order to solve the deficiencies in the prior art of rare earth concentrates such as the serious "three wastes", the large amount of caustic soda used and the high cost, and the follow-up process requiring a large amount of acid to dissolve, a rotary bed processing rare earth concentrate is provided. mine method

Method used

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  • Method of treating rare earth ore concentrate by adopting revolving bed
  • Method of treating rare earth ore concentrate by adopting revolving bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Phosphate Rare Earth Concentrate with 20% REO by weight. Rare earth concentrate, sodium carbonate, sodium chloride, binder (clay 50%+50% sodium carboxymethyl cellulose) are mixed and stirred according to the weight ratio of 100:5:30:3 to obtain the mixed material, and the obtained The mixed materials were pelletized to obtain water-containing raw pellets with a pellet particle size of 8 mm. The prepared water-containing green pellets are dried at 150° C. to obtain rare earth dry pellets with a water content of 1%. Then the rare earth dry pellets are roasted in a rotary bed, the roasting temperature is 1000°C, the residence time of the rare earth dry pellets in the rotary bed is 30min, and the rotary bed uses a regenerative gas radiant tube for closed radiation heating. After roasting, heat is obtained. State pellets. The obtained hot state pellets are directly water-quenched, and 1% calcium chloride (in terms of the weight percentage of the hot state pellets) is added...

Embodiment 2

[0058] Rare Earth Mixed Concentrate, REO 50% by weight. Rare earth concentrate, sodium carbonate, sodium chloride, binder (clay 80% + 20% sodium humate) are mixed and stirred according to the weight ratio of 100:20:80:10 to obtain a mixed material, and the obtained mixed material Carrying out pellet forming to obtain water-containing raw pellets with a pellet particle size of 12 mm. The prepared water-containing green pellets are dried at 200° C. to obtain rare earth dry pellets with a water content of 0.5%. Then the rare earth dry pellets are roasted in a rotary bed, the roasting temperature is 900°C, the residence time of the rare earth dry pellets in the rotary bed is 80min, and the rotary bed uses a regenerative gas radiant tube for closed radiation heating, and the heat is obtained after roasting. State pellets. The obtained hot pellets are directly water-quenched, and 12% calcium chloride (in terms of the weight percent of the hot pellets) is added to carry out wet gri...

Embodiment 3

[0061] Rare earth mixed concentrate with 60% REO by weight. Mix the rare earth concentrate, sodium carbonate, sodium chloride, and binder (bentonite 70%+30% modified starch) in a weight ratio of 100:30:100:15 to obtain a mixed material, and carry out the obtained mixed material The pellets were molded to obtain water-containing raw pellets with a pellet particle size of 10 mm. The prepared water-containing green pellets are dried at 200° C. to obtain rare earth dry pellets with a water content of 2%. Then the rare earth dry pellets are roasted in a rotary bed, the roasting temperature is 750°C, the residence time of the rare earth dry pellets in the rotary bed is 100min, and the rotary bed uses a regenerative gas radiant tube for closed radiation heating, and the heat is obtained after roasting. State pellets. The obtained hot state pellets are directly water-quenched, and 20% calcium chloride (in terms of the weight percentage of the hot state pellets) is added to carry out...

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Abstract

The invention relates to a method of treating rare earth ore concentrate by adopting a revolving bed. The method comprises the following steps: compounding rare earth ore concentrate, sodium carbonate, a chlorinating agent and an adhesive according to weight proportion, and uniformly stirring to obtain a mixed material; forming the mixed material in palletizing manner to prepare water-containing green pellets; drying or airing the water-containing green pellets to obtain dried rare earth pellets; adopting the revolving bed to roast the dried rare earth pellets to obtain thermal-state pellets; water quenching the thermal-state pellets, and adding calcium chloride for wet-type ore grinding to obtain ore pulp; and filtering or carrying out suction filtration on the ore pulp, and carrying out elution to separate solid and liquid so as to obtain filter residue and rare earth chloride solution. According to the method, plenty of alkali is not needed during the roasting process, and when rare earth is extracted from the roasted product, water can be directly added for leaching without introducing acid or alkali, so that the cost is low, the economic benefit is excellent, and the environmental protection index is excellent. In addition, the invention further relates to a system capable of adopting the method to treat rare earth ore concentrate.

Description

technical field [0001] The invention relates to the technical field of rare earth metallurgy, and more specifically, to a method for treating rare earth concentrates in a rotating bed. Background technique [0002] my country's rare earth reserves are the first in the world. However, most of the proven rare earth ores have complex components and low rare earth content, which is not conducive to direct industrial application. At present, the rare earth content of mixed rare earth concentrates used in industrial production is generally 50%-60%, while the rare earth content of raw ore is much lower than this level, so it is necessary to effectively remove gangue minerals and harmful impurities in rare earth raw ore. That is, after the rare earth concentrate is obtained through mineral processing, the rare earth is extracted. However, the rare earth phosphate mineral (monazite) contained in the mixed rare earth mineral is very stable even at high temperature, and it is difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/08C22B1/243C22B59/00
CPCC22B1/08C22B1/243C22B59/00Y02P10/20
Inventor 陈文亮刘占华王欣王岩薛逊丁银贵左晓鹏吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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