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
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Embodiment 1
[0031] First, the rare earth chloride heptahydrate is prepared into a nearly saturated rare earth chloride solution; in the rare earth chloride solution, the concentration of the rare earth chloride is 200 g / L.
[0032] In this embodiment, the rare earth chloride heptahydrate is specifically cerium chloride heptahydrate.
[0033] Then, the rare earth chloride solution is sprayed into the spray drying tower, and the temperature of the spray drying tower is controlled to be 120°C to obtain the rare earth chloride trihydrate.
[0034] Again, the rare earth chloride trihydrate was added into the melting dehydration reactor for heating and melting, the temperature was controlled at 850° C., and the vacuum degree was 50 mm Hg to obtain molten clear liquid and impurity liquid.
[0035] Finally, after standing for 30 minutes for clarification, the supernatant molten supernatant liquid was taken out and cooled to obtain anhydrous rare earth chloride.
[0036] The obtained anhydrous ra...
Embodiment 2
[0038] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 2 and embodiment 1 is that, in this embodiment, the rare earth chloride heptahydrate is specifically lanthanum chloride heptahydrate; The temperature is 75 mm Hg to obtain molten clear liquid and impurity liquid; in the last step, after 40 minutes of standing for clarification, the upper layer of molten clear liquid is taken out and cooled to obtain anhydrous rare earth chloride.
[0039] The obtained anhydrous rare earth chloride is analyzed for insolubles, and it is found that the content (wt%) of water-insolubles is 3.0%; through Karl Fischer moisture analyzer detection, wherein the moisture content is 5%; through XRD analysis, the main The composition is anhydrous rare earth chloride.
Embodiment 3
[0041] In the description of Embodiment 3, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between embodiment 3 and embodiment 1 is that, in this embodiment, the rare earth chloride heptahydrate is specifically neodymium chloride heptahydrate; The temperature is 100mm Hg to obtain molten clear liquid and impurity liquid; in the last step, after standing for 50 minutes for clarification, the upper layer of molten clear liquid is taken out and cooled to obtain anhydrous rare earth chloride.
[0042]The obtained anhydrous rare earth chloride is analyzed for insolubles, and it is found that the content (wt%) of water-insolubles is 2.0%; through Karl Fischer moisture analyzer detection, wherein the moisture content is 3%; through XRD analysis, the main The composition is anhydrous rare earth chloride.
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Abstract
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