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A kind of roasting decomposition method of mixed rare earth ore

A mixed rare earth and roasting technology, which is applied in the roasting and decomposition of sodium carbonate of mixed rare earth ore, the recovery process of thorium, fluorine and phosphorus, rare earth, roasting and decomposition of mixed rare earth ore, which can solve the problems of sodium carbonate agglomeration and reduce the consumption , Reduce production costs, no exhaust emissions

Active Publication Date: 2020-11-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the problems existing in the prior art, the object of the present invention is to provide a method for roasting and decomposing mixed rare earth ores, using the method of combining blank roasting and acid solution excellent leaching to remove calcium, barium, fluorine and phosphorus to solve the problem of sodium carbonate The problem of agglomeration in the roasting process, while reducing the production cost, the economic benefits are significant

Method used

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  • A kind of roasting decomposition method of mixed rare earth ore
  • A kind of roasting decomposition method of mixed rare earth ore
  • A kind of roasting decomposition method of mixed rare earth ore

Examples

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Embodiment 1

[0062] This embodiment provides a method for roasting and decomposing mixed rare earth ores, such as figure 1 As shown, the method includes the following steps:

[0063] (1) heating up the mixed rare earth ore to 550° C. in the air for blank roasting for 3 hours;

[0064] (2) According to the solid-to-liquid ratio of 2:1, the roasted product obtained in step (1) is mixed with hydrochloric acid with a concentration of 25 wt%, and then leached at 35° C., and the leachate and slag are obtained after filtering;

[0065] (3) Mix the slag and sodium carbonate obtained in step (2) according to a mass ratio of 3:1, heat up to 800°C and roast for 1.5h, and then use the obtained roasted product under water at 40°C according to a solid-to-liquid ratio of 1:1 Carry out leaching, obtain water immersion liquid and water leaching residue after filtering;

[0066] (4) According to the solid-to-liquid ratio of 2:1, use the hydrochloric acid that concentration is 10wt% to carry out pickling t...

Embodiment 2

[0070] Compared with Example 1, except that the temperature of sodium carbonate roasting in step (3) is adjusted to 650 ℃, other steps and conditions are exactly the same as Example 1.

Embodiment 3

[0072] This embodiment provides a method for roasting and decomposing mixed rare earth ores, said method comprising the following steps:

[0073] (1) heating up the mixed rare earth ore to 500° C. in the air and roasting in blank for 5 hours;

[0074] (2) According to the solid-to-liquid ratio of 2.5:1, the roasted product obtained in step (1) is mixed with hydrochloric acid with a concentration of 15 wt%, and then leached at 50°C, and the leachate and slag are obtained after filtering;

[0075] (3) Mix the slag and sodium carbonate obtained in step (2) according to a mass ratio of 4.5:1, heat up to 700° C. and roast for 1.5 h, and then use the obtained roasted product at 30° C. Carry out leaching, obtain water immersion liquid and water leaching residue after filtering;

[0076] (4) According to the solid-to-liquid ratio of 2:1, use hydrochloric acid with a concentration of 15wt% to pickle the water leaching residue obtained in step (3) at 25° C. to obtain pickling solution ...

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Abstract

The invention relates to a roasting decomposition method for mixed rare earth ore. The roasting decomposition method for the mixed rare earth ore comprises the steps that the mixed rare earth ore is blankly roasted in air, a product obtained through blank roasting is mixed with acid liquor and is then leached, and leachate and slag are obtained after solid-liquid separation; and the slag and sodium carbonate are mixed and then roasted, a roasted product is leached with water, and aqueous leaching liquor and aqueous leaching residues are obtained after solid-liquid separation. According to theroasting decomposition method for the mixed rare earth ore, bastnaesite in the mixed rare earth ore is decomposed through blank roasting first, and then the acid liquor is added for optimized leachingto remove calcium, barium, fluorine and phosphorus before the sodium carbonate in the mixed rare earth ore is roasted, so that consumption of the sodium carbonate is reduced, the problem of caking inthe roasting process is solved, and the production cost is greatly reduced. By adoption of the roasting decomposition method for the mixed rare earth ore, the technological process is shortened, energy consumption is reduced, no waste gas is exhausted in the whole technological process, and the radioactivity of the slag reaches the standard; and meanwhile, comprehensive step-by-step recycling ofrare earth, thorium, fluorine and phosphorus is achieved, and the roasting decomposition method has good economic benefits and application prospects.

Description

technical field [0001] The invention relates to the technical field of ore smelting, in particular to a method for roasting and decomposing mixed rare earth ores, in particular to a process for roasting and decomposing mixed rare earth ores with sodium carbonate and recovering rare earths, thorium, fluorine and phosphorus. Background technique [0002] Rare earths are known as "industrial vitamins". At present, they are widely used in petroleum, chemical industry, metallurgy, textile, ceramics, glass, permanent magnet materials and other fields. With the advancement of science and technology and the continuous expansion of application fields, rare earths The value is increasing and it has become an important strategic resource. Therefore, the development and utilization of rare earth ores is of great significance to various industries. How to maximize the effective mining of rare earth ores and reduce the waste and pollution of resources in the mining process has become an u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B59/00C22B1/02C22B3/06C22B3/10C22B60/02C01B21/38C01B25/22
CPCC01B21/38C01B25/22C22B1/02C22B3/065C22B3/10C22B59/00C22B60/0291Y02P10/20
Inventor 赵君梅刘会洲杨超齐涛朱兆武
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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