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A kind of separation method of aluminum in the production process of chromium salt

A technology of production process and separation method, applied in the preparation of chromate/dichromate, aluminum hydroxide, etc., can solve the problems of high water content, loss of chromium, small particle size, etc., and achieves easy filtration and low production cost. , the effect of small loss

Active Publication Date: 2017-11-24
LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum cannot be separated completely by this method
In addition, colloidal hydrated alumina precipitates in the solution, resulting in Al(OH) 3 Small particle size, high water content, difficult slurry filtration and washing, and colloidal structure even wraps a large amount of Cr(VI), which makes the separation of aluminum ions and chromium ions more difficult, which not only causes a large amount of chromium loss, but also causes serious environmental problems. Pollution

Method used

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  • A kind of separation method of aluminum in the production process of chromium salt
  • A kind of separation method of aluminum in the production process of chromium salt
  • A kind of separation method of aluminum in the production process of chromium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a, 100g of sodium dichromate alkaline solution is placed in the first container, and the sodium dichromate alkaline solution contains 0.75% trivalent aluminum ion by mass fraction, and then adds 20% sulfuric acid solution , stirring continuously to make the pH of the mixed solution=6.0;

[0021] B, constantly add the ethanol solution that mass fraction is 25% 8-hydroxyquinoline in the mixed solution, constantly stir, until there is no golden yellow precipitation to generate again, and reaction temperature is 65 ℃; The chemical reaction that takes place is as follows:

[0022]

[0023] C, filter the material obtained through the reaction of step b, the liquid obtained is a sodium dichromate solution, and the golden yellow precipitate of the gained is 8-hydroxyquinoline aluminum;

[0024] d. Place the golden-yellow precipitate of 8-hydroxyquinoline aluminum obtained in step c in a second container, and continuously add a 45% mass fraction of sodium ethoxide solution to...

Embodiment 2

[0028] a, 100g of sodium dichromate alkaline solution is placed in the first container, and the sodium dichromate alkaline solution contains trivalent aluminum ions with a mass fraction of 0.75%, then add a sulfuric acid solution with a mass fraction of 18% , stirring continuously to make the pH of the mixed solution=7.0;

[0029] B, continuously adding the ethanol solution of 30% 8-hydroxyquinoline in mass fraction to the mixed solution, stirring constantly, until no golden yellow precipitate is generated, and the reaction temperature is 70° C.;

[0030] C, filter the material obtained through the reaction of step b, the liquid obtained is a sodium dichromate solution, and the golden yellow precipitate of the gained is 8-hydroxyquinoline aluminum;

[0031] d. Place the golden-yellow precipitate of 8-hydroxyquinoline aluminum obtained in step c in a second container, and continuously add 50% sodium ethoxide solution to the second container until the 8-hydroxyquinoline aluminum...

Embodiment 3

[0034] a, 100g of sodium dichromate alkaline solution is placed in the first container, and the sodium dichromate alkaline solution contains trivalent aluminum ions with a mass fraction of 0.75%, and then a sulfuric acid solution with a mass fraction of 25% is added , stirring continuously to make the pH of the mixed solution=5.0;

[0035] b. Constantly adding an ethanol solution of 20% 8-hydroxyquinoline in a mass fraction to the mixed solution, stirring constantly, until no golden precipitate is generated, and the reaction temperature is 60° C.;

[0036] C, filter the material obtained through the reaction of step b, the liquid obtained is a sodium dichromate solution, and the golden yellow precipitate of the gained is 8-hydroxyquinoline aluminum;

[0037] d. Place the golden-yellow precipitate of 8-hydroxyquinoline aluminum obtained in step c in a second container, and continuously add a 40% mass fraction of sodium ethoxide solution to the second container until the 8-hydro...

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Abstract

The invention discloses a separation method of aluminum in chromium salt production. The separation method comprises a, putting a sodium bichromate alkaline solution containing Al<3+> in a first container, adding an acid solution into the first container and keeping mixed solution pH in a range of 5-7, b, continuously adding an ethanol solution of 8-hydroxyquinoline into the mixed solution at a reaction temperature of 60-70 DEG C until gold precipitates are not produced, and c, separating the reaction products to obtain a sodium bichromate solution and 8-hydroxyquinoline aluminum salt gold precipitates. The separation method does not change the existing processes, utilizes 8-hydroxyquinoline aluminum salt to realize complete separation of aluminum in a chromium salt, has a small sodium bichromate loss and does not produce wastes in a reaction. The 8-hydroxyquinoline aluminum salt does not carry charge, does not adsorb other ions, forms clean precipitates, has large particle sizes and has a low recovery and reuse cost.

Description

technical field [0001] The invention relates to a method for separating aluminum, in particular to a method for separating aluminum in the production process of chromium salt. Background technique [0002] The production process of chromium salt is to use chromium ore as raw material, and after roasting, sodium dichromate is obtained through leaching, neutralization, acidification, evaporation, crystallization and other processes. Part of the aluminum in the clinker enters the sodium dichromate solution during leaching. Aluminum exists in the form of sodium metaaluminate in alkaline solution. The method of removing aluminum in industrial production is to neutralize and acidify the leaching solution with sulfuric acid, and hydrolyze sodium metaaluminate to form aluminum hydroxide precipitation. Aluminum cannot be separated completely by this method. In addition, colloidal hydrated alumina precipitates in the solution, resulting in Al(OH) 3 Small particle size, high water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/14C01F7/36
CPCC01F7/36C01G37/14
Inventor 邸万山孙树桐
Owner LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE
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