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Method for removing heavy metals chromium and nickel in aluminum slag

A technology for heavy metals and aluminum slag, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as aluminum loss, achieve small aluminum loss, low processing cost, and realize resources The effect of chemical utilization

Active Publication Date: 2018-11-20
SHENZHEN CHANGLONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the by-product aluminum slag produced by general aluminum profile manufacturers cannot be captured by ordinary weak organic acids or organic sulfur heavy metals because it contains aluminum hydroxide and chromium hydroxide (both of which are amphoteric hydroxides) with similar properties. Removal and separation of heavy metal chromium
Generally, the heavy metal trivalent chromium is oxidized and separated by adding an oxidizing agent under alkaline conditions. However, aluminum hydroxide and alkali will also react under strong alkali conditions, resulting in the loss of aluminum.

Method used

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  • Method for removing heavy metals chromium and nickel in aluminum slag
  • Method for removing heavy metals chromium and nickel in aluminum slag
  • Method for removing heavy metals chromium and nickel in aluminum slag

Examples

Experimental program
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Effect test

Embodiment 1

[0058] (1) Add 100g of wet aluminum slag (moisture content is about 80%) in the three-necked flask with built-in magnetic stirring rotor, then add 150g tap water in the three-necked flask, then place the three-necked flask in a constant temperature magnetic stirring water bath, And turn on the magnetic stirring, and stir at a speed of 100 r / min for about 15 minutes, so that the larger aluminum slag is evenly dispersed in the aqueous solution.

[0059] (2) Continue to slowly add ammonia water dropwise in the three-necked flask so that the pH value of the entire mixed solution is 10.

[0060] (3) Install a condenser tube on the middle port of the three-necked flask, and seal the other two ports of the three-necked flask with corresponding glass stoppers, then turn on the tap water for condensation cycle, and set the heating temperature to 50°C, and then turn on the constant temperature magnetic stirring Heat the water bath to the preset water bath temperature, maintain the water...

Embodiment 2

[0068] (1) Add 100g of wet aluminum slag (moisture content is about 80%) in the three-necked flask with built-in magnetic stirring rotor, then add 150g tap water in the three-necked flask, then place the three-necked flask in a constant temperature magnetic stirring water bath, And turn on the magnetic stirring, and stir at a speed of 100 r / min for about 15 minutes, so that the larger aluminum slag is evenly dispersed in the aqueous solution.

[0069] (2) Continue to slowly add ammonia water dropwise into the three-necked flask so that the pH value of the entire mixed solution is 10.5.

[0070] (3) Install a condenser tube on the middle port of the three-necked flask, and seal the other two ports of the three-necked flask with corresponding glass stoppers, then turn on tap water for condensation cycle, and set the heating temperature to 45°C, then turn on the constant temperature magnetic stirring Heat the water bath to the preset water bath temperature, maintain the water bat...

Embodiment 3

[0078] (1) Add 100g of wet aluminum slag (moisture content is about 80%) in the three-necked flask with built-in magnetic stirring rotor, then add 150g tap water in the three-necked flask, then place the three-necked flask in a constant temperature magnetic stirring water bath, And turn on the magnetic stirring, and stir at a speed of 100 r / min for about 15 minutes, so that the larger aluminum slag is evenly dispersed in the aqueous solution.

[0079] (2) Continue to slowly add ammonia water dropwise in the three-necked flask so that the pH value of the entire mixed solution is 11.

[0080] (3) Install a condenser tube on the middle port of the three-necked flask, and seal the other two ports of the three-necked flask with corresponding glass stoppers, then turn on the tap water for condensation cycle, and set the heating temperature to 40°C, and then turn on the constant temperature magnetic stirring Heat the water bath to the preset water bath temperature, maintain the water...

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Abstract

The invention discloses a method for removing heavy metals chromium and nickel in aluminum slag. The method comprises the following steps: (1) adding filter residue and water into a three-necked flask, and then adding ammonia water and a strong oxidant in sequence to obtain a mixed liquid through reaction; (2) filtering the mixed liquid. According to the method provided by invention, a low-cost reagent raw material is utilized to simultaneously effectively remove the heavy metals chromium and nickel in the aluminum slag with an one-step method, and the aluminum loss during the treatment process is very small, so that the aluminum slag after removal of the heavy metals can be directly prepared into a water purifier product with standard heavy metals, the occupation utilization of the aluminum slag is greatly improved, the resource utilization of the aluminum slag is realized, huge economic and environmental benefits are brought, and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of aluminum slag treatment, in particular to a method for removing heavy metals chromium and nickel in aluminum slag. Background technique [0002] Aluminum slag, as a by-product of the production of aluminum products, is mostly identified as hazardous waste because it contains various small amounts of heavy metals such as chromium, nickel, lead, etc. As a big country in the aluminum industry, China produces a large amount of aluminum slag every year. If it is not handled properly, it will cause a lot of waste and pollution. Therefore, how to efficiently recycle this resource has very important social, economic and environmental benefits. At present, the preparation of water purifiers for aluminum products by using aluminum slag is one of the main technologies for its recycling. However, most of them cannot be directly recycled to prepare qualified water purifiers because of excessive heavy metal content. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00
CPCC02F1/00
Inventor 周小峰董红红董林辉李杨熊阳辉周晓青杨庆蔡振山
Owner SHENZHEN CHANGLONG TECH CO LTD
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