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Method of removing iron impurities from trivalent chromium compound

A compound, trivalent chromium technology, applied in the field of iron impurity removal, can solve the problems that have not been seen yet, the iron impurity removal effect is not good, and achieve the effect of good application prospect, good iron removal effect and low cost.

Active Publication Date: 2020-11-10
HUBEI ZHENHUA CHEMICAL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the ion exchange resin has the characteristic of preferentially adsorbing high-valent ions, it is difficult to remove ferrous ions in the solution for trivalent chromium solution. not effectively
[0005] At present, for the removal of iron impurities in trivalent chromium compounds, there is no report on the selective oxidation of ferrous iron in the solution of trivalent chromium compounds, and then the selective removal of iron ions in the solution by using adsorbents

Method used

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  • Method of removing iron impurities from trivalent chromium compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] in 30gL -1 In the basic chromium sulfate solution, quantitatively add 15 times of theoretical amount of hydrogen peroxide according to the content of iron impurities to selectively oxidize the ferrous ions in the solution; add a certain amount of sulfuric acid to adjust the pH value of the solution to 2, Add iron ion imprinting polymer containing phosphonic acid functional groups, the amount added is 0.003g mL -1 , after shaking and adsorbing at 30° C. for 3 hours, the solution was filtered to obtain the adsorbent after adsorption and the basic chromium sulfate solution after iron removal.

[0051] After analysis and calculation, the content of iron impurities in the solution after iron removal is 0.076mg L -1 , The removal rate of iron impurities is 97.60%.

Embodiment 2

[0053] in 30gL -1 In the basic chromium sulfate solution, quantitatively add 1 times the theoretical amount of hydrogen peroxide according to the content of iron impurities, and selectively oxidize the ferrous ions in the solution; add a certain amount of sulfuric acid to adjust the pH value of the solution to 2, Add iron ion imprinting polymer containing phosphonic acid functional groups, the amount added is 0.003g mL -1 , after shaking and adsorbing at 30°C for 3 hours, the solution was filtered to obtain the adsorbent after adsorption and the basic chromium sulfate solution after iron removal. After the solvent in the solution was removed by spray drying, the basic formula after iron removal was obtained. Chromium sulfate.

[0054] After analysis, detection and calculation, the content of iron impurities in the solution after iron removal is 0.298mg L -1 , The removal rate of iron impurities is 90.59%.

Embodiment 3

[0056] in 30gL -1 In the basic chromium sulfate solution, quantitatively add 3 times the theoretical amount of hydrogen peroxide according to the content of iron impurities to selectively oxidize the ferrous ions in the solution; add a certain amount of sulfuric acid to adjust the pH value of the solution to 2, Add iron ion imprinting polymer containing phosphonic acid functional groups, the amount added is 0.003g mL -1 , after shaking and adsorbing at 30° C. for 3 hours, the solution was filtered to obtain the adsorbent after adsorption and the basic chromium sulfate solution after iron removal.

[0057] After analysis, detection and calculation, the content of iron impurities in the solution after iron removal is 0.198mg L -1 , The removal rate of iron impurities is 93.75%.

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Abstract

The invention relates to a method for removing iron impurities from a trivalent chromium compound. The method comprises the following steps of adding an oxidant into a solution of the trivalent chromium compound to oxidize ferrous iron in the solution; and adjusting the pH value of the solution, and adding an adsorbent capable of selectively adsorbing iron ions for adsorption to obtain an adsorbedadsorbent and an iron-removed trivalent chromium compound solution. According to the method, the divalent iron in the solution is selectively oxidized by utilizing the oxidizing agent, and then the iron impurities are removed by utilizing the adsorbent with selectivity on the iron ions, so that the deep removal of the iron impurities in the trivalent chromium compound is realized, the content ofthe iron impurities in the trivalent chromium compound solution after iron removal is less than 0.5 mg L-1, and the removal rate of the iron impurities is greater than 85%, and can be up to 97% or above. Meanwhile, iron and chromium on the adsorbent are desorbed step by step, an iron-containing solution, a chromium-containing solution and the adsorbent capable of being recycled are obtained, and the method has the advantages of being low in cost, easy to operate and good in iron removal effect.

Description

technical field [0001] The invention relates to the technical fields of hydrometallurgy and chromium chemical industry, in particular to a method for removing iron impurities from trivalent chromium compounds. Background technique [0002] Iron is one of the most abundant elements in the earth's crust. It exists not only in iron ore, but also coexists with many other elements. At the same time, since iron and steel materials are the most commonly used materials in industrial production, these iron impurities are often introduced into products during the production process. Therefore, iron impurities are a common impurity in the industrial production process. In trivalent chromium compounds, the presence of iron impurities seriously affects the performance of the product. For example, basic chromium sulfate is a very commonly used chrome tanning agent. The trivalent chromium in the chrome tanning agent coordinates with the carboxyl groups on collagen molecules to produce cro...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B3/42C22B34/32
CPCC22B3/44C22B3/42C22B34/32Y02P10/20
Inventor 朱光锦程西川唐海燕段静裴丽丽石大学庆朋辉黄国强张笛马丹张红玲商琴徐红彬廖荣
Owner HUBEI ZHENHUA CHEMICAL CO LTD
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