Method for preparing anhydrous rare-earth chloride based on spray drying-melting dehydration
A technology of rare earth chloride and dehydration method, which is applied in the direction of rare earth metal chloride, rare earth metal compound, rare earth metal halide, etc. It can solve the problems of low product purity, harsh operating conditions, and environmental pollution, and achieve simple process and high equipment efficiency. less demanding effect
Inactive Publication Date: 2018-03-06
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Abstract
The invention discloses a method for preparing anhydrous rare-earth chloride based on spray drying-melting dehydration. The method comprises the following steps: S1, preparing a rare-earth chloride heptahydrate into a rare-earth chloride solution with a concentration of not less than 200 g/L; S2, performing spray drying on the rare-earth chloride solution at a temperature of 110-120 DEG C so as toobtain a rare-earth chloride trihydrate; S3, heating and melting the rare-earth chloride trihydrate so as to obtain molten liquor and impurity liquid, wherein in the heating and melting process, thetemperature is 850-1000 DEG C, and the vacuum degree is 50-100mm mercury column; and S4, separating and cooling the molten liquor, thereby obtaining the anhydrous rare-earth chloride. According to themethod disclosed by the invention, the operation of preparing the anhydrous rare-earth chloride from the rare-earth chloride heptahydrate is realized by adopting the spray drying-melting dehydration.The method is simple in process, pollution-free, low in equipment requirement and capable of easily realizing industrialized production; and compared with a general dehydration method in the prior art, the method disclosed by the invention has the advantages that a protective atmosphere is not needed, organic matters or other heavy metals do not need to be introduced, and production of hydrogen chloride or ammonia and other toxic gases is avoided.
Application Domain
Rare earth metal chlorides
Technology Topic
Heavy metalsEquipment requirement +12
Examples
- Experimental program(3)
Example Embodiment
Example Embodiment
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PUM
Property | Measurement | Unit |
Concentration | 200.0 | g/l |
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