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Device and method for preparing high-concentration chromate solution

A chromate, high-concentration technology, applied to cells, electrolytic processes, electrolytic components, etc., to achieve the effect of simplifying process equipment

Active Publication Date: 2018-01-16
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 at present reduce or reduce the emission of Cr(Ⅵ) in chromium slag to a certain extent, and the existence of hexavalent chromium in slag cannot be completely avoided by a single deficiency

Method used

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  • Device and method for preparing high-concentration chromate solution
  • Device and method for preparing high-concentration chromate solution
  • Device and method for preparing high-concentration chromate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] A titanium mesh with an outer diameter of 280 mm, an inner diameter of 80 mm, and a stainless steel mesh with an outer diameter of 70 mm are placed in a hollow stainless steel cylinder with an inner diameter of 300 mm. Hollow plastic partitions are used for insulation between titanium mesh and stainless steel. An electrolysis device with double anode and double cathode is formed. Fill the titanium mesh with 100kg of ferrochrome with a particle size of <100mm, and fill the electrolytic cell with 44L of sodium hydroxide solution with a concentration of 260g / L. The titanium mesh of the electrolytic cell is electrically connected to the positive pole of the power source, and the stainless steel is electrically connected to the negative pole of the power source. Turn on the power supply, adjust the output current to 100A, and the cell voltage <2.42V. After 610h of continuous electrolysis, the electrolyte temperature is 50°C. During this period, water is supplemented to maint...

Embodiment 2

[0092] Conductive copper bars are arranged on the long sides of the rectangular parallelepiped plastic tank with length, width and height of 400mm*500mm*500mm, one side of which is electrically connected to the positive pole of the power supply, and the other side is electrically connected to the negative pole of the power supply. Place 4 groups of rectangular parallelepiped titanium mesh (length, width and height of 400mm*50mm*400mm) and 5 groups of stainless steel plates (length, width and height of 400mm*2mm*400mm) on the conductive copper bar. The distance between the titanium mesh and the stainless steel plate is 10mm. The titanium mesh is electrically connected with the positive pole of the power supply, and the stainless steel plate is electrically connected with the negative pole of the power supply. Fill each group of titanium mesh with 25kg of ferrochrome with a particle size of <40mm, and fill the plastic tank with 40L of sodium hydroxide solution with a concentration...

Embodiment 3

[0094] A titanium mesh with an outer diameter of 280 mm, an inner diameter of 80 mm, and a stainless steel mesh with an outer diameter of 70 mm are placed in a hollow stainless steel cylinder with an inner diameter of 300 mm. Hollow plastic partitions are used for insulation between 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 to the positive pole of the power source, and the stainless steel is electrically connected to the negative pole of the power source. Fill the 4 titanium meshes of the same-assembled double anode and double cathode electrolysis device with 100kg of ferrochromium with a particle size of 0.17g / A·h.

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Abstract

The invention relates to a device for preparing a high-concentration chromate solution, wherein the device comprises an electrolytic tank, a double-cathode device, a double-anode device, and a plurality of settling tanks; the electrolytic tank comprises a cylindrical main body part and a conical collection part, the upper end of the main body part is provided with an electrolyte solution inlet, and the lower end of the main body part is provided with an electrolyte solution outlet; an inner cathode is arranged in the electrolytic tank, and the cylindrical main body part of the electrolytic tank is used as an outer cathode; the double-anode device comprises a cylindrical inner anode and a cylindrical outer anode arranged outside the cylindrical inner anode in a sleeving manner, and the inner cathode is arranged inside the inner anode in a sleeving manner; an insulation partition plate is used for supporting the double-anode device; each settling tank is provided with a feed port and a discharge port, the feed port of the first settling tank is connected with a discharge port of the electrolytic tank, the discharge port of the first settling tank is connected with the feed port of the second settling tank, and in the way, the discharge port of the last settling tank communicates with the electrolytic tank.

Description

Technical field [0001] The invention relates to a preparation method of chromium salt, in particular to a device and method for preparing a high-concentration chromate solution. Background technique [0002] Chromium salt products play a very important and irreplaceable role in the national economy and people’s lives. The chromium salt industry is one of the most competitive resource-based 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 the national economy. Chromium salt products using chromate as raw materials include: dichromate, chromic anhydride, chromium oxide, chromium yellow and chromium salt refined (basic chromium sulfate), etc. These products are widely used in metallurgy, pigments, tanning, dyes, spices, metal surface treatment, welding rods, coinage, catalysts, printing and dyeing, medicine and other industries. According to statistics, 10% of the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B9/18C25B15/08C25B15/02
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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