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Preparation method of absolute neodymium chloride

A neodymium chloride and water chlorination technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., to achieve the effects of low dehydration temperature, improve product purity, and reduce equipment corrosion

Inactive Publication Date: 2018-01-19
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems in the above-mentioned prior art, the present invention provides a preparation method of anhydrous neodymium chloride, which has the advantages of simple and easy process, high dehydration efficiency, low preparation temperature, and alleviates the problem of equipment corrosion, while the environment Pollution is small, and the purity of anhydrous neodymium chloride prepared is high

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  • Preparation method of absolute neodymium chloride
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  • Preparation method of absolute neodymium chloride

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[0027] The invention provides a preparation method of anhydrous neodymium chloride. The preparation method uses neodymium chloride hexahydrate as a raw material, and specifically carries out segmental fluidized dehydration under a hydrogen chloride protective atmosphere, thereby obtaining high-purity, dehydrated Good effect anhydrous neodymium chloride.

[0028] It is worth noting that the preparation method of anhydrous neodymium chloride according to the present invention can be carried out based on a fluidized dehydration device with two chambers.

[0029] It will be understood that, although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0030] Specific reference figure 1 , the two-chamber fluidized dehydration device includes a lower fluidized chamber 111 and an upper fluidized chamber 112 connected in sequence; wh...

Embodiment 1

[0058] In Example 1, a two-chamber fluidized dehydration device was used, the feed rate was controlled to be 100kg / h, the temperatures of the first-stage fluidized dehydration and the second-stage fluidized dehydration were respectively 60°C and 140°C, and at the same time, the first-stage fluidized dehydration and The time of the second-stage fluidized dehydration is 20 minutes, and the anhydrous neodymium chloride product is finally obtained.

[0059] The anhydrous neodymium chloride product obtained in the present embodiment was analyzed, wherein the water-insoluble content was 6.0% (wt%); the moisture content was 6.0% (wt%) detected by the Karl Fischer moisture analyzer; XRD analysis shows that the main component of the product is anhydrous neodymium chloride, such as Figure 4 shown.

Embodiment 2

[0061] In Example 2, a three-chamber fluidized dehydration device was used, the feed rate was controlled to be 100kg / h, and the temperatures of the first-stage fluidized dehydration, deep fluidized dehydration and second-stage fluidized dehydration were 80°C, 130°C and 140°C, respectively. At the same time, the first-stage fluidized dehydration, the deep fluidized dehydration and the second-stage fluidized dehydration all took 20 minutes, and anhydrous neodymium chloride was finally obtained.

[0062] The anhydrous neodymium chloride product obtained in the present embodiment was analyzed, wherein the water-insoluble content was 4.0% (wt%); the moisture content was 4.0% (wt%) detected by the Karl Fischer moisture analyzer; XRD analysis shows that the main component of the product is anhydrous neodymium chloride.

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Abstract

The invention discloses a preparation method of absolute neodymium chloride. The method comprises the following steps: S1) performing primary fluidization and dehydration on neodymium chloride hexahydrate at the temperature of 60-100 DEG C to obtain a neodymium chloride monohydrate crude product; and S2) performing secondary fluidization and dehydration on the neodymium chloride monohydrate crudeproduct at the temperature of 140-160 DEG C to obtain absolute neodymium chloride; wherein, the step of secondary fluidization and dehydration is carried out under hydrogen chloride gas atmosphere. According to the preparation method of absolute neodymium chloride, the neodymium chloride hexahydrate is subjected to segment fluidization and dehydration, hydrogen chloride protective gas atmosphere is provided, the hydrolysis of an intermediate product neodymium chloride monohydrate in a dehydration process to absolute neodymium chloride is effectively inhibited, product purity is greatly increased, the dehydration temperature in the preparation method of the absolute neodymium chloride is low, the preparation cost is low, and the dehydration effect is good.

Description

technical field [0001] The invention belongs to the technical field of rare earth material preparation, and specifically relates to a method for preparing anhydrous neodymium chloride by using neodymium chloride hexahydrate as a raw material. Background technique [0002] Rare earth elements are elements with a strategic position in the 21st century. With their unique physical and chemical properties such as light, electricity, and magnetism, they are widely used in various fields of the national economy and defense industry. Therefore, rare earth elements are called "new materials of the 21st century". treasury". In recent years, rare earth elements have attracted more and more attention due to their important biological activities and pharmacological effects. [0003] The method for preparing anhydrous rare earth chloride has following 4 kinds at present: (1) tetrahydrofuran complex method, namely Deacon in 1979, the method for preparing anhydrous rare earth chloride by m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 韩继龙都永生孙庆国韩凤清李斌凯
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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