A kind of preparation method of anhydrous neodymium chloride

A technology of neodymium chloride and pure water, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve problems such as poor solubility, high content of oxychloride, and inability to fully meet user requirements, and achieve the reduction of non-rare earth Impurities, the effect of improving water solubility

Active Publication Date: 2016-08-31
乐山沃耐稀电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Anhydrous neodymium chloride is mainly used in rubber, pharmaceutical and other industries. At present, only a few factories can produce this product, and the anhydrous neodymium chloride currently on the market mainly uses neodymium chloride hexahydrate to carry out constant temperature at an appropriate temperature. It is prepared by dehydration. The anhydrous neodymium chloride prepared by the above method has a high content of chloride oxide and poor solubility, which cannot fully meet the requirements of users.

Method used

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  • A kind of preparation method of anhydrous neodymium chloride

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0038] like figure 1 Shown, a kind of preparation method of anhydrous neodymium chloride comprises the following steps:

[0039] (1) 1 part of neodymium carbonate and 1.5 parts of dilute hydrochloric acid are added in the reactor to form a mixed solution;

[0040] (2) Acid

[0041] Adjusting the pH value of the mixed solution in step (1) to 1.5, stirring and reacting for 1 hour to obtain a mixed solution containing precipitate;

[0042] (3) Filtration and impurity removal

[0043] Obtain filtrate after the mixed solution that also has precipitation in step (2) is filtered through 1000 mesh sieves;

[0044] (4) microfiltration

[0045] The filtrate of step (3) is added into a microporous filter to obtain the filtrate after microfiltration;

[0046] (5) Evaporation and concentration

[0047] Heating the filtrate of step (4) to 150° C., and incubating for 5 hours to obtain a concentrated solution;

[0048] (6) cooling crystallization

[0049] Cool the concentrated solutio...

specific Embodiment 2

[0066] A preparation method of anhydrous neodymium chloride, comprising the following steps:

[0067] (1) 1 part of neodymium carbonate and 2 parts of dilute hydrochloric acid are added in the reactor to form a mixed solution;

[0068] (2) Acid

[0069] Adjust the pH value of the mixed solution in step (1) to 2, stir and react for 1 hour to obtain a mixed solution containing precipitate;

[0070] (3) Filtration and impurity removal

[0071] Obtain filtrate after the mixed solution that also has precipitation in step (2) is filtered through 1000 mesh sieves;

[0072] (4) microfiltration

[0073] The filtrate of step (3) is added into a microporous filter to obtain the filtrate after microfiltration;

[0074] (5) Evaporation and concentration

[0075] Heating the filtrate of step (4) to 150° C., and incubating for 7 hours to obtain a concentrated solution;

[0076] (6) cooling crystallization

[0077] Cool the concentrated solution of step (5) to 20°C, crystallize for 18 ...

specific Embodiment 3

[0094] A preparation method of anhydrous neodymium chloride, comprising the following steps:

[0095] (1) 1 part of neodymium carbonate and 1.8 parts of dilute hydrochloric acid are added in the reactor to form a mixed solution;

[0096] (2) Acid

[0097] Adjusting the pH value of the mixed solution in step (1) to 1.8, stirring and reacting for 1 hour to obtain a mixed solution containing precipitate;

[0098] (3) Filtration and impurity removal

[0099] Obtain filtrate after the mixed solution that also has precipitation in step (2) is filtered through 1000 mesh sieves;

[0100] (4) microfiltration

[0101] The filtrate of step (3) is added into a microporous filter to obtain the filtrate after microfiltration;

[0102] (5) Evaporation and concentration

[0103] Heating the filtrate of step (4) to 150° C. and insulated for 6 hours to obtain a concentrated solution;

[0104] (6) cooling crystallization

[0105] Cool the concentrated solution of step (5) to 20°C, crystal...

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Abstract

The invention relates to a preparation method of anhydrous neodymium chloride. The preparation method comprises the following steps: (1) mixing neodymium carbonate and diluted hydrochloric acid to form a solution; (2) adjusting the pH value of the mixed solution and standing for 1 hour; (3) filtering to remove impurities; (4) performing micro-filtration; (5) performing evaporation and concentration; (6) performing cooling crystallization; (7) performing centrifugal dewatering; (8) dissolving with pure water; (9) performing evaporation and concentration; (10) performing cooling crystallization; (11) performing centrifugal dewatering; and (12) performing step constant-temperature dewatering to obtain the anhydrous neodymium chloride. The preparation method of anhydrous neodymium chloride provided by the invention has the following beneficial effects: (1) the content of oxychlorides in the anhydrous neodymium chloride is reduced; (2) the water solubility of anhydrous neodymium chloride is increased; and (3) the non-rare earth impurities in the product are reduced.

Description

technical field [0001] The invention belongs to the field of chemical preparation, and in particular relates to a preparation method of anhydrous neodymium chloride. Background technique [0002] Anhydrous neodymium chloride is mainly used in rubber, pharmaceutical and other industries. At present, only a few factories can produce this product, and the anhydrous neodymium chloride currently on the market mainly uses neodymium chloride hexahydrate to carry out constant temperature at an appropriate temperature. Prepared by dehydration The anhydrous neodymium chloride prepared by the above method has a high content of chloride oxide and poor solubility, which cannot fully meet the requirements of users. Contents of the invention [0003] Purpose of the invention: the present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the present invention discloses a preparation method of anhydrous neodymium chloride. [0004] Technical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 杨青
Owner 乐山沃耐稀电子材料有限公司
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