Method for joint production of chromium oxide green, iron oxide red and high-purity chromate by electrolytic ferrochromium

A joint production, chromium oxide green technology, applied in electrolytic components, electrolytic process, cells, etc., to simplify process equipment and improve efficiency

Active Publication Date: 2019-03-26
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Various methods for preparing chromate in the industry can reduce or reduce the emission of Cr (Ⅵ) in chromium slag to a certain extent, but cannot completely avoid the existence of hexavalent chromium in slag.

Method used

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  • Method for joint production of chromium oxide green, iron oxide red and high-purity chromate by electrolytic ferrochromium
  • Method for joint production of chromium oxide green, iron oxide red and high-purity chromate by electrolytic ferrochromium
  • Method for joint production of chromium oxide green, iron oxide red and high-purity chromate by electrolytic ferrochromium

Examples

Experimental program
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Effect test

Embodiment

[0101] Preparation of high-concentration sodium chromate solution: insert a titanium mesh with an outer diameter of 280 mm and an inner diameter of 80 mm, and a stainless steel mesh with an outer diameter of 70 mm in a stainless steel hollow cylinder with an inner diameter of 300 mm. Hollow plastic partitions are used to insulate the titanium mesh and stainless steel. An electrolysis device with double anode and double cathode is formed. Fill the titanium mesh with 100 kg of ferrochrome with a particle size of <100 mm, and fill the electrolytic cell with 44 L of sodium hydroxide solution with a concentration of 260 g / L. The titanium mesh of the electrolytic cell is electrically connected with the positive pole of the power supply, and the stainless steel is electrically connected with the negative pole of the power supply. Turn on the power supply, adjust the output current to 100A, and the cell voltage <2.42V. After 610 hours of continuous electrolytic reaction, the temperat...

Embodiment 2

[0107] A stainless steel mesh with an outer diameter of 280 mm and an inner diameter of 80 mm and a stainless steel mesh with an outer diameter of 70 mm are placed in a stainless steel hollow cylinder with an inner diameter of 300 mm. Hollow plastic partitions are used to insulate the titanium mesh and stainless steel. An electrolysis device with double anode and double cathode is formed. The titanium mesh of the electrolytic cell is electrically connected with the positive pole of the power supply, and the stainless steel is electrically connected with the negative pole of the power supply. Fill 100 kg of ferrochrome with a particle size of <100 mm into the titanium meshes of 4 electrolytic devices with the same assembly of double anodes and double cathodes, fill the 1# electrolytic tank with a concentration of 20% sodium hydroxide solution, and 2# electrolytic The tank is filled with a mixed solution of 8.95% sodium chromate and 14.08% sodium hydroxide, the 3# electrolytic ...

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Abstract

The invention relates to a method for joint production of chromium oxide green, iron oxide red and high-purity chromate by electrolyzing ferrochrome, comprising the steps of: adopting a self-circulation method for electrolytic reaction, automatically controlling the temperature at 20°C to 60°C, and controlling according to formula 1 Circulate the reaction time to obtain high-concentration chromate solution and solid slag; carry out gravity separation on the obtained solid slag to obtain iron hydroxide, and calcinate at 500°C to 800°C to obtain iron oxide red; The high-concentration chromate solution is subjected to hydrothermal reaction to obtain a high-purity chromate purification solution and chromium hydroxide solid; the high-purity chromate purification solution is filtered and crystallized to obtain a high-purity chromate product; Chromium oxide solid is calcined to obtain chromium oxide green.

Description

technical field [0001] The invention relates to the development and utilization technology of chromite, in particular to a method for jointly producing chromium oxide green, iron oxide red and high-purity chromate by electrolyzing ferrochrome. Background technique [0002] Chromium salt products play a very important and irreplaceable role in the national economy and people's lives, and the chromium salt industry is one of the most competitive resource raw material industries in the world. As the parent product of chromium salt, chromate is an indispensable and important chemical raw material in the development of national economy. Chromium salt products based on chromate include: dichromate, chromic anhydride, chromium oxide, chrome yellow and chromium salt essence (basic chromium sulfate), etc. These products are widely used in metallurgy, pigments, tanning, dyes, spices, metal surface treatment, welding electrodes, coinage, catalysts, printing and dyeing, medicine and ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B9/06C25B9/18C25B15/08C25B15/02C25B9/17
CPCC25B1/00C25B15/02C25B15/08C25B9/17C25B9/70
Inventor 董亚萍冯海涛李武梁建李波张波郑竹林史建斌王永全杨维德史海琴
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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