Method for producing high-purity metal chromium by electrolysis

A metal chromium, high-purity technology, used in the improvement of process efficiency, photography technology, instruments, etc.

Active Publication Date: 2008-09-10
XINJIANG SING HORN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the problem of traditional electrolytic production of metal chromium, and provide a m...

Method used

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  • Method for producing high-purity metal chromium by electrolysis
  • Method for producing high-purity metal chromium by electrolysis
  • Method for producing high-purity metal chromium by electrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1: Prepare chromic anhydride and concentrated sulfuric acid into electrolyte: chromic anhydride 250g / L, sulfuric acid 2.5g / L. 30m in total 3 . The electrolyte enters the electrolytic cell through the plate heat exchanger for circulation, the current density is 1500A / m 2 , The single cell voltage is 3.8V. The electrolyte temperature is 15°C, after 22 hours of electrolysis reaction, an electrolytic chromium sheet with a thickness of 1-2mm is produced. After testing, the main chemical components of the product are:

[0032] Table 1

[0033] %

[0034] Cr

Embodiment 2

[0035] Example 2: Prepare chromic anhydride and concentrated sulfuric acid into electrolyte: chromic anhydride 300g / L, sulfuric acid 3g / L. 30m in total 3. The electrolyte enters the electrolytic cell through the plate heat exchanger for circulation, the current density is 1400A / m 2 , The single cell voltage is 3.7V. The electrolyte temperature is 12°C, after 24 hours of electrolysis reaction, an electrolytic chromium sheet with a thickness of 1-2mm is produced. After testing, the main chemical components of the product are:

[0036] Table 2

[0037] %

[0038] Cr

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Abstract

The invention discloses a method for electrolytic production of high purity chromium metals, wherein, chromic anhydride and concentrated sulfuric acids are mixed into electrolytes according to a certain proportion which are thrown into a liquid receiving tank and then cooled by an acid-proof pump through a super stainless steel plate heat exchanger, and cooling water is provided by a steam lithium bromide refrigerating machine; the electrolytes after cooling are thrown into an electrolytic cell, pass through a liquid separation device in the cell and uniformly arrive between cathode plates and anode plates for electrolytic reaction; the electrolytes after electrolysis flow into the liquid receiving tank from an overflow weir of the electrolytic cell, and then the circulation is repeated to and fro. After the thickness of chromium plates reaches 1 to 2 millimeters through electrolysis of 24 hours or so, the cathode plates of the electrolytic cell are entirely moved out by a hanger frame through a pole plate switching device under the condition of no power failure, and then the electrolytic reaction is continued after replacement of a set of novel cathode plates. The chromium plates are knocked off manually from the replaced cathode plates, and the content of chromium can reach 99.99 percent after third-stage countercurrent washing and drying through a vibrated fluidized bed. The method reduces the cost and improves the production efficiency.

Description

Technical field [0001] The patent of the invention relates to a method for producing high-purity metallic chromium by electrolytic chromic anhydride aqueous solution. The Cr content in metallic chromium can reach 99.99%. Background technique [0002] Metal chromium has the characteristics of hardness, wear resistance, high temperature resistance, corrosion resistance, etc., so it is widely used in the metallurgical industry, refractory materials and chemical industry. The current production methods of metal chromium mainly include carbon reduction method (blast furnace, electric furnace), metal Thermal reduction method and electrolysis method. [0003] The thermite method consumes a large amount of precious aluminum powder. At the same time, a large amount of impurities such as Fe, Si, and Al are also introduced into the product. The product recovery rate is not high, usually not exceeding 88%. [0004] The purity of metal chromium produced by the carbon reduction method cannot r...

Claims

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Application Information

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IPC IPC(8): C25C1/10
CPCY02P10/20
Inventor 王拥军包勇锋戈宝武朴昌林
Owner XINJIANG SING HORN GRP CO LTD
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