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Method for preparing chromium chloride hexahydrate by using sodium chromate

A technology of chromium chloride hexahydrate and sodium chromate, applied in chromium halide, alkali metal chloride, chemical industry and other directions, can solve the problems of large consumption of hazardous waste and reducing substances, large consumption of energy consumption, etc. The effect of production costs

Active Publication Date: 2020-02-21
SICHUAN YINHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chromium chloride hexahydrate is used to make chromium salt, mordant, chrome plating, pigment, catalyst, etc. At present, the industrial production of chromium chloride hexahydrate in China is generally produced by chromic anhydride reduction method, and sodium chromate is acidified into sodium red alum, and sodium red alum is then made into chromium Acid anhydride, so a large amount of Glauber's salt and chromium-containing sodium bisulfate will be produced in the production process of chromic anhydride, which is listed as hazardous waste, and its utilization value is low, and the overall energy consumption of chromic anhydride to produce chromium chloride is relatively large
[0003] Patent 201410433325.9 describes a process for preparing chromium chloride hexahydrate by the sodium chromate method and using the chromium hydroxide method as an intermediate carrier. In the process of preparing chromium hydroxide, alkaline substances need to be added to adjust the pH to obtain hydroxide Chromium, subsequent washing is required, the consumption of alkaline substances is large, the consumption of reducing substances is large, and the process is lengthy

Method used

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  • Method for preparing chromium chloride hexahydrate by using sodium chromate
  • Method for preparing chromium chloride hexahydrate by using sodium chromate
  • Method for preparing chromium chloride hexahydrate by using sodium chromate

Examples

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Effect test

Embodiment 1

[0027] A method utilizing sodium chromate to prepare chromium chloride hexahydrate, comprising the following steps:

[0028] Add 600g sodium chromate to 556g HCl, heat to boiling, react for ten minutes, filter to remove sodium chloride, pour the filtrate into the reaction tank, add a condensing device, and pump 1017.76g HCl and 69.20g ethanol into In the tank, add the reaction time for a total of 4 hours, the reaction temperature is 85°C, filter out the undissolved sodium chloride, evaporate and concentrate at 100°C until the Baume degree is 49 Baume degrees, filter the sodium chloride once, and then add some water to 47 Baume degrees, cooled to 35 degrees Celsius, crystallized for 4 hours to precipitate chromium chloride hexahydrate, and then centrifuged in a centrifuge for half an hour to obtain chromium chloride hexahydrate crystals, and the prepared chromium chloride hexahydrate crystals were detected. The index parameters are shown in Table 1;

[0029] Table 1

[0030] ...

Embodiment 2

[0033] A method utilizing sodium chromate to prepare chromium chloride hexahydrate, comprising the following steps:

[0034] Add 600g sodium chromate to 559g HCl, heat to boiling, react for ten minutes, filter to remove sodium chloride, pour the filtrate into the reaction tank, add a condensing device, and pump 881.7g HCl and 69.26g ethanol into In the tank, add the reaction time for a total of 4 hours, the reaction temperature is 85°C, filter out the undissolved sodium chloride, evaporate and concentrate at 100°C until the Baume degree is 49 Baume degrees, filter the sodium chloride once, and then add some water to 47 Baume degrees, cooled to 35 degrees Celsius, crystallized for 4 hours to precipitate chromium chloride hexahydrate, and then centrifuged in a centrifuge for half an hour to obtain chromium chloride hexahydrate crystals, and the prepared chromium chloride hexahydrate crystals were detected. The index parameters are shown in Table 2;

[0035] Table 2

[0036] ...

Embodiment 3

[0038] A method utilizing sodium chromate to prepare chromium chloride hexahydrate, comprising the following steps:

[0039] Add 600g sodium chromate to 558g HCl, heat to boiling, react for ten minutes, filter to remove sodium chloride, pour the filtrate into the reaction tank, add a condensing device, and pump 892.7g HCl and 40.22g ethanol into In the tank, add the reaction time for a total of 4 hours, the reaction temperature is 85°C, filter out the undissolved sodium chloride, evaporate and concentrate at 100°C until the Baume degree is 49 Baume degrees, filter the sodium chloride once, and then add some water to 47 Baume degrees, cooled to 35 degrees Celsius, crystallized for 4 hours to precipitate chromium chloride hexahydrate, and then centrifuged in a centrifuge for half an hour to obtain chromium chloride hexahydrate crystals, and the prepared chromium chloride hexahydrate crystals were detected. The index parameters are shown in Table 3;

[0040] table 3

[0041] ...

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Abstract

The invention discloses a method for preparing chromium chloride hexahydrate by using sodium chromate. The method comprises the following processes: dissolving sodium chromate into a certain amount ofhydrochloric acid A; heating to boil, acidifying, filtering undissolved sodium chloride, and pumping hydrochloric acid B and a reducing agent which are uniformly mixed according to a certain proportion while stirring the filtrate; after the reaction is completed, carrying out evaporation concentration, concentrating to Baume degree A; and carrying out secondary filtration to remove precipitated sodium chloride, supplementing water to Baume degree B, cooling to a temperature A, crystallizing, precipitating chromium chloride hexahydrate crystals, and centrifuging to obtain a chromium chloride hexahydrate finished product. According to the method, hydrochloric acid is used for acidification, so that generation of a byproduct mirabilite in a traditional chromic anhydride process is avoided; compared with mirabilite, the byproduct sodium chloride of the method has larger crystal particles and chromium is easy to wash, and in addition, an alkaline substance is not required to be added to adjust the pH to prepare chromium hydroxide, so that the alkaline substance is not required to be consumed and washed, the comprehensive recovery value is realized, and the production cost of productionenterprises is reduced.

Description

technical field [0001] The invention relates to the field of chromium salt chemical industry, in particular to a method for preparing chromium chloride hexahydrate by using sodium chromate. Background technique [0002] Chromium chloride hexahydrate is used to make chromium salt, mordant, chrome plating, pigment, catalyst, etc. At present, the industrial production of chromium chloride hexahydrate in China is generally produced by chromic anhydride reduction method, and sodium chromate is acidified into sodium red alum, and sodium red alum is then made into chromium Acid anhydride, so a large amount of Glauber's salt and chromium-containing sodium bisulfate will be produced in the production process of chromic anhydride, which will be listed as hazardous waste, and its utilization value is low, and the overall energy consumption of chromic anhydride to produce chromium chloride is relatively large. An environment-friendly, simple and energy-saving production method is now ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/04C01D3/04
CPCC01G37/04C01D3/04C01P2006/80Y02P20/10
Inventor 马顺友肖棱尹春林白礼太颜欣樊诗贤
Owner SICHUAN YINHE CHEM
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