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Method for preparing chromium oxide green by using ferrochrome

A technology of chromium oxide green and ferrochrome, which is applied in the direction of electrolysis components and electrolysis process, can solve the problems of cumbersome process, land occupation, environmental pollution, etc., and achieve the effect of simplifying process equipment

Active Publication Date: 2019-06-14
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another equally urgent problem is that a considerable part of the tens of thousands of tons of chromium oxide green produced each year is produced by calcining chromic anhydride, and the toxic solid waste generated by the workshop producing chromic anhydride is piled up, not only occupying land , and caused serious pollution to the environment
[0012] At present, there are few ammonium chromate industrial products in the industry, only ammonium dichromate products, and to obtain ammonium chromate products usually need to obtain sodium dichromate first, and then find a way to convert sodium dichromate into ammonium dichromate, Ammonium dichromate is neutralized with ammonia water to obtain ammonium chromate. This process is obviously cumbersome
As for the idea of ​​using ferrochromium and ammonium salts as raw materials to prepare ammonium chromate products, there is no precedent research or results released in the industry

Method used

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  • Method for preparing chromium oxide green by using ferrochrome
  • Method for preparing chromium oxide green by using ferrochrome

Examples

Experimental program
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Effect test

Embodiment 1

[0089] Example 1: High-concentration ammonium chromate solution was prepared by electrolysis using ferrochromium and ammonia water as raw materials.

[0090] Take 445g of high-carbon ferrochrome and 760mL of 210g / L ammonia water, and place them in the electrolytic cell. Direct current 2A, electrolysis 22h. Obtained 557mL electrolyte and 11.4g ferric hydroxide precipitate. The electrolytic solution contains 21g of ammonium chromate. After evaporation and crystallization, 9.5 g of ammonium chromate solid was obtained, and the ammonium chromate solid was calcined at 1000° C. for 2 hours to obtain 6.1 g of dichromium trioxide.

Embodiment 2

[0092]Take 450g of high-carbon ferrochromium and 800mL of 140g / L ammonia water, and place them in the electrolytic cell. Connect direct current 1.6A, electrolysis 11h. Obtain 630mL electrolyte and 3.1g ferric hydroxide precipitate. The electrolytic solution contains 9.9 g of ammonium chromate. After evaporating and crystallizing, 4.7 g of ammonium chromate solid was obtained, and the ammonium chromate solid was calcined at 1050° C. for 6 hours to obtain 3.0 g of dichromium trioxide.

Embodiment 3

[0093] Implementation example 3: Get 449g of high-carbon ferrochromium, 800mL of 42g / L ammoniacal liquor, place in electrolyzer. Connect direct current 1.8A, electrolysis 11h. Obtained 685mL electrolyte and 4.2g ferric hydroxide precipitate. The electrolytic solution contains 9.4 g of ammonium chromate. After evaporative crystallization, 4.3 g of ammonium chromate solid was obtained, and the ammonium chromate solid was calcined at 950° C. for 12 hours to obtain 2.9 g of dichromium trioxide.

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Abstract

The invention relates to a method for preparing chromium oxide green by using ferrochromium, wherein the method comprises the steps: providing an electrolytic device including an electrolytic tank, adouble-cathode device, a double-anode device, an insulating partition plate, a plurality of settling tanks and an electrode; adopting an ammonium water salt system as an electrolyte solution, carryingout an electrolytic reaction by a self circulating mode, automatically controlling the temperature at 20 DEG C-60 DEG C, and controlling the electrolyte solution circulating reaction time according to the formula 1 described in the specification, to obtain an chromic acid ammonium salt solution after the reaction; and successively carrying out evaporation concentration, cooling crystallization and filtration separation of the chromic acid ammonium salt solution to obtain an ammonium chromate solid, and calcining the ammonium chromate solid for 2 h-12 h at the temperature of 950 DEG C-1100 DEGC 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 preparing chromium oxide green 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 trioxide, 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 co...

Claims

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Application Information

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IPC IPC(8): C25B1/00
Inventor 冯海涛李波董亚萍梁建张波李武郑竹林
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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