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Method for producing high-purity metal chromium by reducing anhydrous chromium chloride through utilizing metal magnesium

A technology of chromium chloride and metal chromium, which is applied in the field of producing high-purity metal chromium, can solve problems such as difficulty in guaranteeing product quality, high cost, complicated vacuum carbon reduction process, etc., and achieves the effect of easy removal and mild reaction conditions

Active Publication Date: 2014-07-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention aims at the shortcomings of existing electrolysis technology such as low current efficiency, high cost, small production scale, complex vacuum carbon reduction process, and difficulty in guaranteeing product quality, and provides a high-efficiency electrolysis technology with simple process, mild reaction conditions, high production efficiency, and high product purity. The preparation method of pure chromium provides an effective way for the preparation of high-purity metallic chromium

Method used

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  • Method for producing high-purity metal chromium by reducing anhydrous chromium chloride through utilizing metal magnesium
  • Method for producing high-purity metal chromium by reducing anhydrous chromium chloride through utilizing metal magnesium
  • Method for producing high-purity metal chromium by reducing anhydrous chromium chloride through utilizing metal magnesium

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Effect test

Embodiment 1

[0030] Purify anhydrous chromium chloride by sublimation under the protection of argon; weigh 18g superior pure NaCl, 22g anhydrous MgCl 2 After the anhydrous chromium chloride after 9g purification and 4g99.99% magnesium metal (200% of theoretical quantity) are mixed, place in the metal chromium crucible, then put the metal chromium crucible into the atmosphere furnace protected by argon, Then heat to 550°C, keep it warm for 4 hours, then wash the reaction product three times with water and pickle three times, wherein the pickling pH=2 (hydrochloric acid), pickling for 60 minutes each time, wash the pickled product with deionized water After reaching neutrality, high-purity metal chromium is obtained, and the chemical elements of high-purity metal chromium powder are detected, and the results are shown in Table 2.

Embodiment 2

[0032] Purify anhydrous chromium chloride by sublimation under dry chlorine gas; weigh 38g of superior pure KCl and 22g of anhydrous LiCl respectively, heat to 400°C to make mixed molten salt, then successively mix 9g of purified anhydrous chromium chloride and Add 2.45g of 99.99% magnesium metal (120% of the theoretical amount) into the molten salt and react for 4 hours. The whole reaction process is protected by dry argon, and then the reaction product is washed with water and pickled three times in sequence, wherein the pickling pH=3 (hydrochloric acid), pickled 100 minutes, the pickling product was washed to neutrality with deionized water to obtain high-purity metal chromium, and the chemical elements of high-purity metal chromium powder were detected, and the results are as shown in table 2.

Embodiment 3

[0034] Anhydrous chromium chloride was sublimated and purified under nitrogen protection; 40g of anhydrous NaCl was weighed, heated to 850°C to make molten salt, and then 9g of purified anhydrous chromium chloride and 2.45g of high-purity metal magnesium (theoretical 120% of the amount) was added molten salt to react for 2h, and the whole reaction process was protected by argon, and then the reaction product was washed with water 3 times and pickled 3 times successively, wherein the pickling pH=2 (hydrochloric acid), pickled for 30 minutes, and the The pickling product was washed with deionized water until neutral to obtain high-purity metal chromium. The chemical elements of the high-purity metal chromium powder were detected, and the results are shown in Table 2.

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Abstract

The invention belongs to the field of producing metal chromium, and particularly relates to a method for producing high-purity metal chromium by reducing anhydrous chromium chloride through utilizing metal magnesium. The method comprises the following steps: (1) subliming and purifying anhydrous chromium chloride; (2) fusing the anhydrous chromium chloride purified in the step (1) into fused salt, adding metal magnesium for carrying out reduction reaction; or, directly carrying out reduction reaction on the metal magnesium and anhydrous chromium chloride without adoption of a fused salt medium; (3) rinsing and filtering a reduced product; (4) performing acid washing and filtering to the rinsed metal chromium filter cake; and (5) rinsing the acid-washed metal chromium filter cake to be neutral, and drying to obtain a high-purity metal chromium product. By adopting anhydrous chromium chloride as a raw material, the anhydrous chromium chloride can be sublimed and purified, and the introduction of metal impurities can be reduced from the source compared with the electrolysis technology and the vacuum carbon reduction technology. Compared with the metal thermal reduction and vacuum carbon reduction, the reaction conditions are milder.

Description

technical field [0001] The invention belongs to the field of metal chromium production. Specifically, the invention relates to a method for producing high-purity metal chromium by reducing anhydrous chromium chloride with metal magnesium. Background technique [0002] Chromium is a brittle metal and cannot be used as a metal material alone. However, when it is alloyed with iron, nickel, cobalt, titanium, aluminum, copper, etc., it becomes an engineering material with heat resistance, wear resistance and special properties. These materials are widely used in aerospace, nuclear reactors, automobiles, shipbuilding, jet aircraft manufacturing, gas turbine manufacturing and other industries. However, these materials have relatively high requirements on the purity of metallic chromium, generally reaching above 99.7. GB / T28908—2012 "High-purity Metal Chromium" stipulates the composition of hydrogen-reduced high-purity metal chromium (GHCr series) and carbon-reduced high-purity met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/32C22B5/04
Inventor 齐涛李永利张绘曲景奎余志辉赵宏欣
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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