Method for co-treating electroplating waste residues and chromium-containing heavy metal ion waste liquid

A technology for heavy metal ions and electroplating waste residues, applied in chemical instruments and methods, filtration treatment, water/sewage treatment, etc., can solve the problems of slow reaction speed, high pH of waste liquid, high hardness of effluent water, etc., and achieve mild reaction conditions and low cost , the effect of easy operation

Active Publication Date: 2022-01-21
BEIJING UNIV OF CHEM TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of slow reaction speed, large amount of sedimentation and high hardness of effluent
In addition, due to the formation of Cr(OH) 3 The particle size is small and difficult to filter; and the pH of the waste liquid after alkali treatment is too high to be directly used or discharged, and must be treated again

Method used

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  • Method for co-treating electroplating waste residues and chromium-containing heavy metal ion waste liquid
  • Method for co-treating electroplating waste residues and chromium-containing heavy metal ion waste liquid
  • Method for co-treating electroplating waste residues and chromium-containing heavy metal ion waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Treatment of Cr in chrome tanning waste liquor with Zn electroplating waste residue 3+ Ions: collect chrome tanning waste liquid, filter to remove solid skin residue, in which Cr 3+ The ion concentration is 1300mg / L, and the pH value of the waste solution is 5; add 1g of Zn electroplating waste residue to 40mL of the waste solution, and react at 25°C for 12h.

[0015] After the reaction was completed, it was filtered, and the supernatant obtained became clear, from dark green to colorless (such as figure 2 shown), the pH value is neutral, after testing, the supernatant heavy metal Cr after treatment 3+ The concentration is less than 1mg / L, and the removal efficiency reaches 99.92%, which can continue to be used for tanning production water. The resulting solid precipitate was filtered from figure 1 In the XRD of Zn electroplating residues, the mineralization products obtained after treating chrome tanning waste liquor can be seen, and the characteristic peaks such a...

Embodiment 2

[0017] Treatment of Cr in chrome tanning waste liquor with Cu electroplating waste residue 3+ Ion: Using Cu electroplating waste residue to treat Cr in chrome tanning waste liquor 3+ Ions: collect chrome tanning waste liquid, filter to remove solid skin residue, in which Cr 3+ The ion concentration was 1300 mg / L, and the pH value of the waste liquid was 5; 1 g of Cu electroplating waste was added to 40 mL of waste liquid; the reaction was carried out at 35°C for 12 hours. After the reaction is completed, it is filtered, and the obtained supernatant is continuously used for tanning production water; the obtained solid precipitate is used for adsorption and removal of organic dyes.

Embodiment 3

[0019] Treatment of Cr in chrome tanning waste liquor with Ni electroplating waste residue 3+ Ion: Treatment of Cr in chrome tanning waste liquor with Zn electroplating waste residue 3+ Ions: collect chrome tanning waste liquid, filter to remove solid skin residue, in which Cr 3+ The ion concentration was 1300 mg / L, and the pH value of the waste liquid was 5; 1 g of Ni electroplating waste was added to 40 mL of waste liquid; the reaction was carried out at 35°C for 12 hours. After the reaction is completed, it is filtered, and the obtained supernatant is continuously used for tanning production water; the obtained solid precipitate is used for adsorption and removal of organic dyes.

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Abstract

The invention discloses a method for co-treating electroplating waste residues and chromium-containing heavy metal ion waste liquid. According to the method, the electroplating waste residues of an electroplating factory are used as a mineralizer of a chrome tanning waste liquid of a tanning factory, oxides and hydroxides in the electroplating waste residues adsorb chromium ions and are mineralized and converted into chromium-containing hydrotalcite, the obtained chromium-containing hydrotalcite has an ultra-stable mineralization effect, the chromium ions are not prone to being dissolved out, and secondary pollution cannot be caused. By means of the method, the environmental pollution problem caused by the chrome tanning waste liquid can be effectively solved, recycling of the electroplating waste residues is achieved, the filtered supernate can be used for the follow-up leather pickling procedure, the mineralized solid product can effectively adsorb organic dyes such as Congo red and Evans blue, and the green route of treating waste with waste is achieved. The method is mild in reaction condition, simple and convenient to operate, simple in process, free of alkali, economical in atom, low in cost and capable of being applied to electroplate factories and leather factories on a large scale.

Description

technical field [0001] The invention belongs to the technical field of waste liquid and slag treatment, and in particular relates to a method for co-processing electroplating waste slag and chromium-containing heavy metal ion waste liquid. Background technique [0002] At present, the traditional method for removing trivalent chromium heavy metals is to add alkali (such as NaOH) to make chromium ions form Cr(OH) 3 Precipitate, then filter and separate. This method has the disadvantages of slow reaction speed, large amount of precipitation, and high hardness of effluent. In addition, due to the formation of Cr(OH) 3 The particle size is small and difficult to filter; and the pH of the waste liquid after alkali treatment is too high to be directly used or discharged, and must be treated again. Therefore, it is crucial to develop an economical, efficient, convenient and environmentally friendly method for treating tanning waste liquor. Contents of the invention [0003] B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F9/04B01J20/06C02F101/22
CPCC02F1/62C02F1/001B01J20/06C02F2101/22Y02P10/20
Inventor 宋宇飞李佳欣赵宇飞李绍泉
Owner BEIJING UNIV OF CHEM TECH
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