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Method for preparing high-value spinel material by resourcefully treating electroplating sludge

A technology for electroplating sludge and spinel, which is applied in chemical instruments and methods, preparation of alkaline earth metal aluminate/alumina/aluminum hydroxide, chemical/physical processes, etc. Solve the problems such as the type of mud and heavy metals, and achieve the effect of increasing the yield, avoiding secondary pollution, and high purity

Active Publication Date: 2021-02-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of method is only aimed at a single type of special sludge, and does not meet the actual situation that the types and contents of heavy metals in different electroplating sludges vary greatly

Method used

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  • Method for preparing high-value spinel material by resourcefully treating electroplating sludge
  • Method for preparing high-value spinel material by resourcefully treating electroplating sludge
  • Method for preparing high-value spinel material by resourcefully treating electroplating sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043](1) Take a certain electroplating sludge, dry it and crush it, and measure the content of its main elements as shown in Table 1:

[0044] Table 1 Types and contents of electroplating sludge elements

[0045] element Ni Al Ca S Fe Si content 27.1％ 13.9％ 6.0％ 4.4％ 3.7％ 1.9％

[0046] It can be seen from Table 1 that the sludge is mainly composed of nickel and aluminum elements. After nickel is extracted by pre-aciding, MgO is added to prepare magnesium aluminum spinel. The specific method is:

[0047] Take 20g of the dried and crushed sludge, add 100mL of dilute hydrochloric acid to extract nickel, stir for 30min, and the extract solution has a balanced pH ≈ 4; then filter to obtain a nickel-containing solution and filter cake; dry the filter cake and break it;

[0048] (2) pre-calcining the dried sludge after step (1) at 400° C. for 0.5 hours;

[0049] (3) The pre-roasted material is broken, the total mass is 12.8g, and the Ni content ...

Embodiment 2

[0053] (1) Take a certain electroplating sludge, dry it and crush it, and measure the content of its main elements as shown in Table 2:

[0054] Table 2 Types and contents of electroplating sludge elements

[0055] element Fe Zn Ca S Al Cu content 16.5％ 13.6％ 7.8％ 3.4％ 1.4％ 1.3％

[0056] The sample is mainly composed of iron and zinc elements, which can be obtained by adding Fe 2 o 3 Or ZnO to prepare magnetic zinc-iron spinel catalytic materials;

[0057] (2) Take 10 g of dried sludge crushed in step (1), and pre-roast at 500° C. for 1 hour;

[0058] (3) The material after pre-roasting is crushed, the total mass is 8.9g, the calculated iron content is 18.5%, and the zinc content is 15.3%; according to Fe:Zn molar ratio 2:1 (ZnFe 2 o 4 spinel) adding 1.0g Fe 2 o 3 Mix evenly to obtain sludge treatment material;

[0059] (4) Grinding the sludge treatment material prepared in step (3), and pressing it into tablets at 10MPa for 2min;

...

Embodiment 3

[0069] (1) Take a certain electroplating sludge, dry it and crush it, and measure the content of its main elements as shown in Table 3:

[0070] Table 3 Types and contents of electroplating sludge elements

[0071] element Cr Al Cu Ca S Fe content 14.9％ 7.2％ 5.9％ 6.3％ 4.3％ 3.0％

[0072] The sample is mainly composed of chromium and aluminum elements, and magnesium aluminum chromium spinel refractory materials can be prepared by adding MgO; among them, the pH of the sludge leachate is 9, and chromium is easily oxidized at high temperature under alkaline conditions, so pre-acidification is required Wash, the specific method is:

[0073] Take 30g of dried and crushed sludge, add 60mL of dilute hydrochloric acid, stir for 10min, and the pH of the solution after equilibrium is ≈ 6; then filter to obtain dilute acid solution and sludge filter cake; dry the filter cake and break it;

[0074] (2) pre-roasting the dried sludge after step (1) at 350° ...

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Abstract

The invention belongs to the field of resourceful treatment of solid waste containing heavy metals, and particularly relates to a method for preparing a high-value spinel material by resourcefully treating electroplating sludge. The method comprises the following steps: drying and crushing electroplating sludge, and then pre-roasting; supplementing positive bivalent or positive trivalent metal cation oxide to obtain a sludge treatment material; carrying out refined particle treatment and tabletting on the sludge treatment material, then carrying out high-temperature sintering, crushing and grinding, and washing with acid and water; and finally filtering and drying to obtain the spinel material. According to the method, the electroplating sludge containing rich heavy metals is converted into the spinel material, the application range of resource utilization of the electroplating sludge is expanded, and a new method for treating and disposing the electroplating sludge is provided.

Description

technical field [0001] The invention belongs to the field of recycling solid waste containing heavy metals, and in particular relates to a method for recycling electroplating sludge to prepare high-value spinel materials. Background technique [0002] Electroplating sludge is a toxic and harmful industrial solid waste produced in the electroplating industry, with an annual output of more than 10 million tons in China. Electroplating sludge contains a variety of heavy metals, such as Ni, Cu, Cr, Fe, Al, and Zn, etc., and its content is relatively high. A large amount of electroplating sludge has caused great pressure on industry development, ecological environment, and human health. harm. The traditional electroplating sludge treatment methods are dehydration, cement solidification, and landfill. However, this method is difficult to reduce and occupies a large area. At the same time, the residual heavy metals still have the risk of being released into the environment and ca...

Claims

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Application Information

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IPC IPC(8): C01F7/16C04B35/443C04B35/622C04B35/66B01J23/80H01F41/02
CPCC01F7/162C04B35/443C04B35/62204C04B35/66B01J23/80B01J23/002H01F41/02
Inventor 林璋郑嘉毅刘炜珍宿新泰谭拓刘学明
Owner SOUTH CHINA UNIV OF TECH
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