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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AI-Extracted Technical Summary

Problems solved by technology

However, there are certain problems in the above-mentioned methods: the dehydration effect of the decompression dehydration method is not good, the water content in the product is difficult to meet the requirements, and the product purity is not high; there will be redox in the reaction process of ammonium chloride sublimation method to prepare rare earth chloride. The occurrence of the reaction, hydrogen chloride gas and ammonia gas will be generated during the reaction process, the operating conditions are harsh, the risk is high, and it is difficult to obtain anhydrous rare earth chloride with high purity; the anhydrous rare earth chloride prepared by the rare earth oxide chlorination method is generally The wa...
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Method used

Known to those skilled in the art, in the process of preparing anhydrous rare earth chloride by hydrated rare earth chloride, it is quite difficult to slough off the last molecule of crystallization water, because this dehydration process is often accompanied by partial hydrolysis , and in order to suppress the occurrence of the hydrolysis reaction, that is, dehydration under a protective atmosphere is generally used, and chlorine and hydrogen chloride are often used as the protective gas, which will inevitably cause pollution and hazards. According to the method of the present invention, firstly, the rare earth chloride heptahydrate is spray-dried and dehydrated to obtain the rare earth chloride trihydrat...
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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

[0030] Example 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 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 7%; through XRD analysis, the main The composition is anhydrous rare earth chloride.

Example Embodiment

[0037] Example 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.

Example Embodiment

[0040] Example 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.

PUM

PropertyMeasurementUnit
Concentration200.0g/l

Description & Claims & Application Information

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