Resourceful treatment method of chromium-containing aluminum mud

A treatment method and a resource-based technology, applied in the direction of improving process efficiency, etc., to achieve the effect of recycling and reducing solid waste

Active Publication Date: 2016-08-24
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the invention has a simple process and is easy to industrialize, it needs to add other chemical reagents

Method used

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  • Resourceful treatment method of chromium-containing aluminum mud

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Effect test

Embodiment 1

[0039] The waste residue produced during the production of sodium dichromate in a chromium salt factory has a moisture content of about 60% (mass fraction), and the dry aluminum sludge mainly contains Al 2 o 3 、Cr 2 o 3 、Na 2 CrO 4 , SiO 2 and Fe 2 o 3 Wait.

[0040] (1) Water-soluble: add water to the waste residue (mass ratio of waste residue to water is 1:3), stir and react at 70°C for 1 hour, wash with water repeatedly for 3 times, and filter to obtain chromium (VI)-containing aqueous solution and aluminum-containing filter cake.

[0041] (2) Electroreduction: the aqueous solution containing chromium (VI) is electroreduced to reduce hexavalent chromium to trivalent; electroreduction parameters: the anode electrode is Ru-Ir / Ti, the cathode is Ti plate, and the current density is 150A / m 2 , an ion exchange membrane is added to the electrolyzer to separate the anode and cathode.

[0042] (3) Bipolar membrane electrodialysis: the aqueous solution containing chromium (...

Embodiment 2

[0053] The waste residue produced during the production of sodium dichromate in a chromium salt factory has a moisture content of about 60% (mass fraction), and the dry aluminum sludge mainly contains Al 2 o 3 、Cr 2 o 3 、Na 2 CrO 4 , SiO 2 and Fe 2 o 3 Wait.

[0054] (1) Water-soluble: add water to the waste residue (the mass ratio of waste residue to water is 1:3), stir and react at 70°C for 1 hour, wash with water three times, and filter to obtain chromium (VI)-containing aqueous solution and aluminum-containing filter cake.

[0055] (2) Electroreduction: the aqueous solution containing chromium (VI) is electroreduced to reduce hexavalent chromium to trivalent; electroreduction parameters: the anode electrode is Ru-Ir / Ti, the cathode is Ti plate, and the current density is 150A / m 2 , an ion exchange membrane is added to the electrolyzer to separate the anode and cathode.

[0056] (3) Bipolar membrane electrodialysis: the aqueous solution containing chromium (III) is...

Embodiment 3

[0060] The waste residue produced during the production of sodium dichromate in a chromium salt factory has a moisture content of about 60% (mass fraction), and the dry aluminum sludge mainly contains Al 2 o 3 、Cr 2 o 3 、Na 2 CrO 4 , SiO 2 and Fe 2 o 3 Wait.

[0061] (1) Water-soluble: add water to the waste residue (mass ratio of waste residue to water is 1:3), stir and react at 60°C for 1 hour, wash with water repeatedly for 3 times, and filter to obtain chromium (VI)-containing aqueous solution and aluminum-containing filter cake.

[0062] (2) Electroreduction: the aqueous solution containing chromium (VI) is electroreduced to reduce hexavalent chromium to trivalent; electroreduction parameters: the anode electrode is Ru-Ir / Ti, the cathode is Ti plate, and the current density is 150A / m 2 , an ion exchange membrane is added to the electrolyzer to separate the anode and cathode.

[0063] (3) Bipolar membrane electrodialysis: the aqueous solution containing chromium (...

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Abstract

The invention discloses a resourceful treatment method of chromium-containing aluminum mud. The resourceful treatment method comprises the steps that 1, water is added to the chromium-containing aluminum mud for mixing, and a chromium-containing (VI) aqueous solution and an aluminum-containing (III) filter cake are obtained through heating, dissolution and filtration; 2, the chromium-containing (VI) aqueous solution is subjected to electro-reduction to obtain a chromium-containing (III) aqueous solution; 3, the chromium-containing (III) aqueous solution is subjected to bipolar membrane electrodialysis treatment to obtain a NaOH solution and a chromic acid solution; 4, the NaOH solution in the step 3 is concentrated by adopting membrane distillation to obtain clear water and a concentrated NaOH solution, and the clear water is reused in the water-dissolution process in the step 1; 5, the aluminum-containing filter cake in the step 1 is dissolved in the concentrated NaOH solution in the step 4, heating reaction is performed, filtering separation is performed to obtain a NaAlO2 solution. The resourceful treatment method treats aluminum mud solid waste and achieves resource recycling of chrome and aluminum in the solid waste.

Description

technical field [0001] The invention relates to the field of resourceful treatment of chemical waste, in particular to a resourceful treatment method for chromium-containing aluminum sludge. Background technique [0002] Chromium-containing aluminum slime is a by-product of the production process of chromium salts. Generally, 1 ton of sodium dichromate is produced in industry to produce about 30-50 kg of aluminum slime, which contains a large amount of aluminum (III) and chromium (VI). At present, the processing methods of sodium dichromate production plants for aluminum sludge are: 1. Landfill; 2. Manufacturers with more advanced technology use roasting of aluminum sludge and chromite ore to extract and recover most of the chromium, and then aluminum slag As a waste landfill, although this method can recover most of the chromium, it also has shortcomings. There are still about 2 to 3% chromium (VI) in the aluminum slag. The traditional aluminum slag waste treatment method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/32C22B21/00
CPCC22B7/006C22B21/0023C22B34/32Y02P10/20
Inventor 陈丽娜吕伏建陈磊
Owner ZHEJIANG QICAI ECO TECH CO LTD
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