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Preparation method of anhydrous lanthanum chloride

A technology of lanthanum chloride and lanthanum carbonate, which is applied in the chemical field, can solve the problems of complex reaction process, low solubility of finished products, long production cycle, etc., and achieve the effect of controllable reaction process, simple reaction process and high dissolution rate of finished products

Inactive Publication Date: 2015-10-14
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

But these methods all have the following disadvantages: 1, the reaction process is too complicated, and the reaction conditions are not easy to control, and are not suitable for mass production
2. The production cycle is long; 3. The solubility of the finished product is low, and the solution is not clear and transparent

Method used

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  • Preparation method of anhydrous lanthanum chloride

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0028] A preparation method for anhydrous lanthanum chloride, comprising the following steps:

[0029] (1), 1 part of lanthanum carbonate powder is dissolved with 2 parts of dilute hydrochloric acid to form an acidic solution, and then an appropriate amount of dilute hydrochloric acid is added dropwise to the acidic solution until the pH of the acidic solution is 2, and the reaction is stirred for 1 hour;

[0030] (2) Filtration and impurity removal

[0031] Obtain the filtrate after filtering the mixed solution that also has precipitation in the step (1) through a 1000-mesh sieve;

[0032] (3) microfiltration

[0033] The filtrate of step (2) is added into a microporous filter to obtain the filtrate after microfiltration;

[0034] (4) Evaporation and concentration

[0035] Heating the filtrate of step (3) to 150° C., and incubating for 5 hours to obtain a concentrated solution;

[0036] (5) cooling crystallization

[0037] Cool the concentrated solution of step (4) to 20...

specific Embodiment 2

[0044] A preparation method for anhydrous lanthanum chloride, comprising the following steps:

[0045] (1), 1 part of lanthanum carbonate powder was dissolved with 4 parts of dilute hydrochloric acid to form an acidic solution, then an appropriate amount of dilute hydrochloric acid was added dropwise to the acidic solution until the pH of the acidic solution was 3, and the reaction was stirred for 5 hours;

[0046] (2) Filtration and impurity removal

[0047] Obtain the filtrate after filtering the mixed solution that also has precipitation in the step (1) through a 1000-mesh sieve;

[0048] (3) microfiltration

[0049] The filtrate of step (2) is added into a microporous filter to obtain the filtrate after microfiltration;

[0050] (4) Evaporation and concentration

[0051] Heating the filtrate of step (3) to 150° C., and incubating for 7 hours to obtain a concentrated solution;

[0052] (5) cooling crystallization

[0053] Cool the concentrated solution of step (4) to 2...

specific Embodiment 3

[0060] A preparation method for anhydrous lanthanum chloride, comprising the following steps:

[0061] (1), 1 part of lanthanum carbonate powder was dissolved with 3 parts of dilute hydrochloric acid to form an acidic solution, then an appropriate amount of dilute hydrochloric acid was added dropwise to the acidic solution until the pH of the acidic solution was 2.5, and the reaction was stirred for 3 hours;

[0062] (2) Filtration and impurity removal

[0063] Obtain the filtrate after filtering the mixed solution that also has precipitation in the step (1) through a 1000-mesh sieve;

[0064] (3) microfiltration

[0065] The filtrate of step (2) is added into a microporous filter to obtain the filtrate after microfiltration;

[0066] (4) Evaporation and concentration

[0067] Heating the filtrate of step (3) to 150° C., and keeping it warm for 6 hours to obtain a concentrated solution;

[0068] (5) cooling crystallization

[0069] Cool the concentrated solution of step (...

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Abstract

The invention relates to a preparation method of anhydrous lanthanum chloride. The preparation method comprises following steps: 1, lanthanum carbonate powder is dissolved in dilute hydrochloric acid until pH value is detected to be 2-3, and stirring reaction is carried out for 1 to 5h; 2, an obtained solution is filtered so as to remove impurities; 3, an obtained mixed solution is subjected to millipore filtration so as to obtain a filtrate; 4, the filtrate is subjected to evaporative concentration; 5, an obtained product is cooled on a crystallizing pan to 20 DEG C, and is subjected to 12 to 24h of nature crystallization; 6, an obtained filter liquor is filtered so as to obtain a crystal, and the crystal is delivered into a centrifugal hydroextractor for 20 to 60min of dehydration so as to obtain an intermediate product; 7, the intermediate product is delivered into a non-oxidation drying oven, is heated to 70 DEG C, and is subjected to thermal insulation for 2h so as to obtain LaCl3*3H2O crystal, is heated to 160 DEG C, and is subjected to thermal insulation for 2h so as to obtain LaCl3*H2O crystal, and then is heated to 250 DEG C, and is subjected to thermal insulation for 4h so as to obtain anhydrous lanthanum chloride. Beneficial effects of the preparation method are that: reaction processes are simple, and are convenient to control; production period is short; a clear transparent solution can be obtained via dissolving of the obtained finished product, and impurity content is low.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to a preparation method of anhydrous lanthanum chloride. Background technique [0002] Lanthanum chloride includes anhydrous lanthanum chloride as well as polyhydrated lanthanum chloride compounds. Lanthanum chloride is mainly used to prepare petroleum cracking catalysts, and can also be used as a raw material for extracting single rare earth products or smelting lanthanum-rich mixed rare earth metals. [0003] At present, the preparation method of lanthanum chloride is mainly obtained by lanthanum oxide and hydrochloric acid in the hydrochloric acid system of methanol, and it is also obtained by dehydration of polyhydrated lanthanum chloride in HCl atmosphere. 300 degrees Celsius reaction obtained. However, these methods all have the following disadvantages: 1. The reaction process is too complicated, the reaction conditions are not easy to control, and are not suitable for m...

Claims

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Application Information

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Patent Type & Authority Applications(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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