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Method for preparing dichromate by utilizing ferrochrome

A technology of dichromate and chromate, applied in the direction of cells, electrolytic components, electrolytic process, etc., to achieve the effect of simplifying process equipment

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

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Problems solved by technology

[0009] The current various methods of preparing chromate in the industry have reduced or reduced the amount of Cr in chromium slag to a certain extent. 6+ emissions, but cannot completely avoid the presence of hexavalent chromium in the slag

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  • Method for preparing dichromate by utilizing ferrochrome
  • Method for preparing dichromate by utilizing ferrochrome
  • Method for preparing dichromate by utilizing ferrochrome

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Embodiment Construction

[0048] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0049] The present invention is the result of continuous research and development on the basis of the applicant's invention patent 201310672022.8, titled "Apparatus and method for preparing sodium chromate solution by electrolysis".

[0050] The invention provides a method for preparing dichromate by utilizing ferrochrome, and the specific steps are described in detail as follows.

[0051] In the first step, an electrolysis device is provided. Such as figure 1 As shown, it includes: an electrolytic cell, the electrolytic cell includes a cylindrical main body 11 and a conical collection part 12 connected below the main body...

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Abstract

The invention discloses a method for preparing dichromate by using ferrochrome. The method comprises the following steps: an electrolyte solution undergoes an electrolytic reaction in a self-circulation mode, the temperature of the electrolyte solution in an electrolytic cell is automatically controlled to be 20-60 DEG C, the circulating reacting time for the electrolyte solution is controlled according to a formula 1 being t=c1*V1*M2 *Eta / (2*n*M1*I), and a high-concentration chromate solution is obtained; hydrothermal reaction is carried out on the high-concentration chromate solution to obtain a high-purity chromate solution; the high-purity chromate solution is prepared into a chromate solution with the weight percent concentration of 20%-40%, and the prepared chromate solution is mixed with a dichromate solution with the weight percent concentration of 23%-50% to prepare an anode mixed feeding liquid; and a cathode mixed feeding liquid is provided, and the electrolytic reaction is carried out on the anode mixed feeding liquid and cathode mixed feeding liquid to obtain a dichromate solution.

Description

technical field [0001] The invention relates to the development and utilization technology of chromite, in particular to a method for preparing dichromate by using 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 other industries. According to statistics, 10% of the commodities on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/14C25B9/18C25B15/02C25B15/08
CPCC25B1/14C25B15/02C25B15/08C25B9/70
Inventor 冯海涛董亚萍李波李武梁建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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