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Production method for coproduction of chromium chloride and chromic carbonate

A production method and technology of chromium chloride, applied in chemical instruments and methods, chromium halide, inorganic chemistry and other directions, can solve the problems of easy aging and reduced solubility of chromium carbonate, and achieve low harm to human body, high chromium yield, and high technological short process effect

Active Publication Date: 2012-10-10
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a production method for the co-production of chromium chloride and chromium carbonate to solve the problem that the chromium carbonate prepared by the existing method is easy to age, and the solubility in acidic aqueous solution will be greatly reduced after long-term storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A. Set 0.5m 3 Sodium chromate alkaline solution is put into the reaction tank, the concentration of alkaline solution is 250g / L, the amount of sulfur added is about 12.4kg, the amount of soda sulfide is 49.5kg, and soda sulfide is prepared into a 30% solution;

[0022] B. Heat the sodium chromate alkaline solution to 85°C, add sulfur and alkali sulfide solution in batches and keep stirring, keep the reaction temperature at 85°C, and the reaction time is 160min;

[0023] C, the chromium hydroxide obtained by reduction is filtered, put into reaction tank after washing with the washing water of 35 ℃ of temperature, slowly add the industrial hydrochloric acid 272.6kg that weight percentage composition is 31% and keep stirring, until chromium hydroxide dissolves completely, the obtained After the solution is concentrated and cooled, chromium chloride crystals are precipitated, and the solution is packaged and sealed. After analysis, the content of chromium chloride produced...

Embodiment 2

[0027] A. Set 0.5m 3 Sodium chromate alkaline solution is put into the reaction tank, the concentration of alkaline solution is 300g / L, the amount of added sulfur is about 14.9kg, the amount of soda sulfide is 59.3kg, and soda sulfide is prepared into a 30% solution;

[0028] B. Heat the sodium chromate alkaline solution to 90°C, add sulfur and alkali sulfide solution in batches and keep stirring, keep the reaction temperature at 90°C, and the reaction time is 180min;

[0029] C, the chromium hydroxide that reduction obtains is filtered, puts into reaction tank after washing with the washing water of 45 ℃ of temperature, slowly adds the industrial hydrochloric acid 327.1kg that weight percentage composition is 31% and constantly stirs, until chromium hydroxide dissolves completely, the obtained After the solution is concentrated and cooled, chromium chloride crystals are precipitated, and the solution is packaged and sealed. After analysis, the content of chromium chloride pr...

Embodiment 3

[0033] A. Set 0.5m 3 Sodium chromate alkaline solution is put into the reaction tank, the concentration of alkaline solution is 350g / L, the amount of added sulfur is about 17.4kg, the amount of soda sulfide is 69.2kg, and soda sulfide is prepared into a 30% solution;

[0034] B. Heat the sodium chromate alkaline solution to 95°C, add sulfur and alkali sulfide solution in batches and keep stirring, keep the reaction temperature at 95°C, and the reaction time is about 190min;

[0035] C, the chromium hydroxide that reduction obtains is filtered, puts into reaction tank after washing with the washing water of 55 ℃ of temperature, slowly adds the industrial hydrochloric acid 381.6kg that weight percentage composition is 31% and constantly stirs, until chromium hydroxide dissolves completely, the obtained After the solution is concentrated and cooled, chromium chloride crystals are precipitated, and the solution is packaged and sealed. After analysis, the content of chromium chlor...

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Abstract

The invention discloses a production method for the coproduction of chromium chloride and chromic carbonate, and the production method is used for solving the problems that the chromic carbonate produced through the existing method is easy to age, and the solubility of the chromic carbonate in acidic aqueous solutions is greatly reduced after the chromic carbonate is subjected to long-term storage. According to the production method, an alkaline solution of sodium chromate is taken as a raw material, sulfur and alkali sulfide are taken as reducing agents to be subjected to redox reaction in a reaction tank so as to obtain chromic hydroxide, the obtained chromic hydroxide is filtered and washed and then reacts with hydrochloric acid to produce the chromium chloride, and the chromic carbonate is produced in a manner that the chromium chloride is subjected to the precipitation of a soda solution. The production method has the advantages that the process flow is short, the operation is simple, the redox reaction is complete, the chromium yield is high, and hexavalent chromium is not detected in the filtrate, so that the pollution to the environment cannot be caused.

Description

technical field [0001] The invention relates to a production method for co-producing chromium chloride and chromium carbonate, which belongs to a new method of clean production in the field of chromium salt production. Background technique [0002] Chromium chloride is a commonly used raw material for the preparation of other inorganic and organic chromium compounds. It is an intermediate for the production of chromium and carbon atoms directly bonded to Cr-C organic chromium, especially organic acid chromium, such as medical, food additives, feed additives, oil field The production of chromium compounds mostly uses chromium chloride as raw material. Chromium chloride is used to prepare catalysts, and is also directly used as organic synthesis catalysts, mordants, polymer adhesives and trivalent chromium plating. [0003] Chromium carbonate is more soluble in acid than aged hydroxide, making chromium carbonate more suitable as a raw material for preparing other trivalent ch...

Claims

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Application Information

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IPC IPC(8): C01G37/00C01G37/04
Inventor 张忠元张宏军杨岗谢希智张大波杨亮亮
Owner GANSU JINSHI CHEM
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