Method for preparing dangerous heavy metal removing agent in electroplating wastewater and application thereof

A technology for electroplating wastewater and heavy metals, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that the heavy metal content in the effluent is difficult to meet the national discharge standard, and the removal effect of heavy metal complexes is not good , Difficult to remove metal ions and other problems, to achieve the effect of easy operation, low cost and simple method of use

Active Publication Date: 2013-04-10
增城市高新双江净水剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the certain solubility of metal ion hydroxide in water, it is difficult to remove all metal ions, and the generated precipitate is not stable, and will still be partially dissolved when encountering acid rain and other effects, causing secondary pollution; while using sulfide When treating heavy metal wastewater, the removal effect of heavy metal complexes soluble in water is not good, and secondary pollution is prone to occur, and the heavy metal content in the effluent is difficult to meet the national discharge standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of a dangerous heavy metal remover for electroplating wastewater, comprising the following steps:

[0020] 1) React tetraethylenepentamine and carbon disulfide in potassium hydroxide solution for 2-4 hours, the reaction temperature is 30-40°C, and the pH of the reaction system is 9-12;

[0021] 2) Add epichlorohydrin to the reaction system in step 1) for sufficient reaction, the reaction temperature is 75-85°C, and the reaction time is 4-6h; finally blow off excess carbon disulfide with nitrogen;

[0022] Wherein, the mass ratio of tetraethylenepentamine to carbon disulfide is 1:2, and the mass ratio of carbon disulfide to epichlorohydrin is 1:8.

Embodiment 2

[0024] A preparation method of a dangerous heavy metal remover for electroplating wastewater, comprising the following steps:

[0025] 1) React tetraethylenepentamine and carbon disulfide in potassium hydroxide solution for 2-4 hours, the reaction temperature is 30-40°C, and the pH of the reaction system is 9-12;

[0026] 2) Add epichlorohydrin to the reaction system in step 1) for sufficient reaction, the reaction temperature is 75-85°C, and the reaction time is 4-6h; finally blow off excess carbon disulfide with nitrogen;

[0027] Wherein, the mass ratio of tetraethylenepentamine to carbon disulfide is 1:2.5, and the mass ratio of carbon disulfide to epichlorohydrin is 1:9.

Embodiment 3

[0029] A preparation method of a dangerous heavy metal remover for electroplating wastewater, comprising the following steps:

[0030] 1) React tetraethylenepentamine and carbon disulfide in potassium hydroxide solution for 2-4 hours, the reaction temperature is 30-40°C, and the pH of the reaction system is 9-12;

[0031] 2) Add epichlorohydrin to the reaction system in step 1) for sufficient reaction, the reaction temperature is 75-85°C, and the reaction time is 4-6h; finally blow off excess carbon disulfide with nitrogen;

[0032] Wherein, the mass ratio of tetraethylenepentamine to carbon disulfide is 1:3, and the mass ratio of carbon disulfide to epichlorohydrin is 1:10.

[0033] In order to verify and illustrate the removal effect of the heavy metal remover of the present invention, it is now described in conjunction with specific application examples:

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PUM

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Abstract

The invention discloses a method for preparing a dangerous heavy metal removing agent in electroplating wastewater and application thereof. The method comprises the following steps of: 1), fully reacting tetraethylenepentamine and carbon disulfide under an alkaline environment; and 2), adding epoxy chloropropane into a reactive product in the step 1) to fully react, and finally, blowing away redundant carbon disulfide by nitrogen, wherein the mass ratio of tetraethylenepentamine and carbon disulfide is 1 to (1.8-3.2), and the mass ratio of carbon disulfide and epoxy chloropropane is 1 to (7.5-10). The dangerous heavy metal removing agent is wide in application range, has a good deposition effect, and is completely deposited and dosage-type; heavy metal ions can be separated out without adding other auxiliary flocculating agents, and secondary pollution is avoided; the method is easy in using method, low in cost, simple in preparation process and easy to operate; hexavalent chromium can be directly reduced into trivalent chromium; the trivalent chromium is removed in a complexing mode; and a chromium breaking agent is not needed to be added.

Description

technical field [0001] The invention relates to a preparation method of a hazardous heavy metal remover for electroplating wastewater. Background technique [0002] Heavy metal wastewater refers to wastewater containing heavy metals discharged from industrial production processes such as mining, machinery manufacturing, chemical industry, electronics, and instruments. According to the classification of heavy metal elements contained in heavy metal wastewater, it can generally be divided into wastewater containing chromium (Cr), wastewater containing Nickel (Ni) wastewater, cadmium (Cd) wastewater, copper (Cu) wastewater, zinc (Zn) wastewater, gold (Au) wastewater, silver (Ag) wastewater, etc. Heavy metal wastewater is one of the most serious environmental pollution and one of the most harmful industrial wastewater to humans. Heavy metal pollution in water has become a global environmental pollution problem and seriously affects the health and even life of children and adults...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62
Inventor 刘进龙
Owner 增城市高新双江净水剂有限公司
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