Process for producing anhydrous chromium chloride and chromium oxide green from ferrochrome through boiling chlorination

A technology of boiling chlorination, chromium oxide green, applied in chromium oxide/hydrate, chromium halide, iron halide and other directions, can solve problems such as shortening production process flow, achieve significant economic and social benefits, low manufacturing cost, good quality effect

Inactive Publication Date: 2018-03-27
中成致远有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a process for producing anhydrous chromium chloride and chromium oxide green by boiling chlorination of ferrochrome (chromium-containing alloy), which fundamentally changes the original chromium salt. The production process route greatly shortens the production process, improves product quality, reduces manufacturing costs, and there is no Cr in the whole process 6+ Pollution generation, completely solved the Cr 6+ The pollution problem is completely in line with the national industrial policy. It is a typical new clean production process and is easy to promote and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Grind high-carbon ferrochrome and iron oxide containing 7-8% carbon to 200-325 mesh, mix ferrochrome and iron oxide at a ratio of 100:25-30, and then add it to the boiling water preheated above 850°C In the chlorination furnace, chlorine gas is introduced to carry out chlorination reaction, and the temperature is maintained at 850-1050°C; the first-stage high-temperature condenser controls the outlet temperature to 400-600°C to recover chromium chloride, and the second-stage low-temperature condenser controls the outlet temperature to 100- Ferric chloride is recovered at 150°C; Chromium chloride is passed through an inert gas heated at 700-900°C in a vacuum purification furnace to volatilize and then condense low-boiling impurities, so that chloride impurities such as iron, silicon, and aluminum can be removed, and then Heating the inert gas and circulating this process to purify the solid chromium chloride to obtain high-quality and pure chromium chloride; th...

Embodiment 2

[0023] Example 2: Grinding high-carbon ferrochrome with carbon content of 7%-8% to 200-325 mesh, adding it to a boiling chlorination furnace preheated above 850°C, passing in chlorine gas for chlorination reaction, and adding chromium at the same time Oxygen (or corresponding air) with iron weight ratio of 25-30%, the temperature is maintained at 850-1050°C; the first-stage high-temperature condenser controls the outlet temperature to 400-600°C to recover chromium chloride, and the second-stage low-temperature condenser controls the outlet The ferric chloride is recovered at a temperature of 100-150°C; the chromium chloride is passed into a heated inert gas in a vacuum purification furnace, and the gas temperature is controlled at 700-900°C to volatilize and then condense low-boiling impurities, so that iron, silicon, aluminum Wait for the chloride impurities to be removed, then heat the inert gas, and circulate this process to purify the solid chromium chloride to obtain high-...

Embodiment 3

[0024] Example 3: Grinding high-carbon ferrochrome and iron oxide containing 7%-8% carbon to 200-325 mesh, mixing ferrochrome and iron oxide at a ratio of 100:25-30 and adding to the preheated 850℃ In the boiling chlorination furnace, chlorine gas is introduced to carry out chlorination reaction, and the temperature is kept at 850-1050°C; the first-stage high-temperature condenser controls the outlet temperature to 400-600°C to recover chromium chloride, and the second-stage low-temperature condenser controls the outlet temperature to 100°C Recover ferric chloride at -150°C; stir and wash chromium chloride in 5%-10% hydrochloric acid solution for 1-2 hours, then use filter press or vacuum dehydration to remove acid-soluble impurities such as iron, and filter cake That is, chromium chloride is dissolved in water by adding catalyst metals or quaternary ammonium cations to obtain chromium trichloride aqueous solution. The solution is filtered to remove impurities such as silicon a...

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PUM

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Abstract

The invention discloses a process for producing anhydrous chromium chloride and chromium oxide green by boiling chlorination of ferrochromium, and relates to the technical field of production methods of chromium salts. Crush ferrochrome and heat replenishing agent, mix them well in proportion and add them into the boiling chlorination furnace, and introduce chlorine gas for chlorination reaction, keep the temperature at 850-1050°C to generate anhydrous chromium chloride and ferric chloride, Chromium chloride and ferric chloride are separated by controlling the temperature of the condenser; chromium chloride can be directly used as a chromium chemical raw material after being refined and purified, and can also be calcined at a high temperature of 950-1100°C to produce chromium oxide green. The present invention fundamentally changes the production process route of the original chromium salt, shortens the process flow, improves the product quality, reduces the manufacturing cost, does not produce Cr6+ in the whole process, completely solves the pollution problem of Cr6+, and fully conforms to the national industrial policy , is a typical clean production new technology, easy to popularize and use.

Description

technical field [0001] The invention relates to the technical field of production methods of chromium salts, in particular to a process for producing anhydrous chromium chloride and chromium oxide green by ferrochromium boiling chlorination. Background technique [0002] At present, the anhydrous chromium trichloride is prepared by reacting dichromium trioxide with chlorine and carbon at high temperature. This method has the disadvantages of long process flow, high manufacturing cost, low quality, and the presence of Cr 6+ Pollution and other disadvantages. Chromium trioxide is produced by oxidation roasting, leaching, acidification, crystallization, and drying of chromite ore to produce anhydrous red bauxite sodium, and then react with sulfuric acid to produce chromic anhydride, which is then calcined at high temperature; or chromite ore is oxidized and roasted 1. Sodium chromate solution is obtained by immersion in water, and sulfur is added to reduce and precipitate chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/04C01G49/10C01G37/02
CPCC01G37/04C01G37/02C01G49/10
Inventor 张伟张忠王泽斌
Owner 中成致远有限公司
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