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Method for purifying electroplating wastewater and comprehensively utilizing resources

A technology for electroplating wastewater and resources, applied in chemical instruments and methods, chromium compounds, metallurgical wastewater treatment, etc., can solve the problems that restrict the large-scale use of ion exchange technology, high production costs, etc., and achieve significant economic and social benefits, treatment The effect of low cost and stable process

Active Publication Date: 2009-11-04
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this gel-type resin has a high production cost, which restricts its large-scale use in ion exchange technology.

Method used

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  • Method for purifying electroplating wastewater and comprehensively utilizing resources
  • Method for purifying electroplating wastewater and comprehensively utilizing resources
  • Method for purifying electroplating wastewater and comprehensively utilizing resources

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take 50g of chloromethylated styrene-type macroporous adsorption resin in a three-necked flask, add 300mL of N,N-dimethylformamide, stir at room temperature for 2h, add 16.5g of N-methylimidazole at 40°C for 72h, filter The resin was synthesized and washed with ethanol. The washed resin is vacuum-dried to obtain a chlorine-type macroporous strong base anion-exchange resin containing an imidazole structure.

[0045] Stir 1 g of chlorine-type macroporous strong base anion exchange resin containing imidazole structure in deionized water for 2 h, then add 20 mL of sodium sulfate solution with a molar concentration of 2 mol / L and shake for 10 h until the reaction is complete, filter the resin, and then use deionized The filtered resin is washed with water to remove excess sulfate ions to obtain a sulfate-type macroporous strong base anion exchange resin containing an imidazole structure.

[0046] Stir 1 g of chlorine-type macroporous strong base anion exchange resin contain...

Embodiment 2

[0048] Taking the wastewater of an electroplating factory as the research object, the test results of the main components are shown in Table 1. It can be seen from the table that the wastewater contains a large amount of Cr(III), Cr(VI) and other valuable heavy metal elements, and direct discharge causes environmental pollution. Pollution, recovery of valuable heavy metal elements can produce certain economic benefits.

[0049] Table 1 Main components of electroplating chromium-containing wastewater

[0050] Pollutant name

Cr(V)

Cr(total)

Cu

Zn

Ni

Fe

Al

Concentration (mg / L)

250

344

28.92

16.61

8.589

134.6

5.063

[0051] Chromium (III) is oxidized to chromium (VI): Take 2L of chromium-containing wastewater, use NaOH to adjust the pH value of the wastewater to 13.00, and then add 10.8 mmol of hydrogen peroxide to oxidize the chromium (III) in the wastewater to chromium (VI).

[0052] ...

Embodiment 3

[0056] According to the method of Example 2, in the step of recovering valuable heavy metal resources such as copper and nickel, the pH value is adjusted to 8.00 with hydrochloric acid, so that heavy metal elements such as zinc, copper, nickel and iron in the wastewater are converted into hydroxide precipitation, and the filtrate after precipitation The contents of zinc, copper, nickel, iron, and aluminum in it are 0.13mg / L, 0.22mg / L, 0.41mg / L, 0.69mg / L, and 0.21mg / L respectively.

[0057] The filtrate in the step of adsorbing chromium (VI) on the strongly basic anion exchange resin is adjusted to pH 4.00 with hydrochloric acid. According to Example 2, the secondary adsorption columns are used in series, so that the Cr(VI) content in the wastewater after ion exchange treatment is less than 0.1 mg / L.

[0058] In the step of preparing the chromium product, the sodium chromate solution is prepared by a soluble barium chloride precipitation method to prepare the barium chromate pr...

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Abstract

The invention relates to a method for purifying electroplating wastewater and comprehensively utilizing resources, which is to adopt low-cost strong basic anion-exchange resin containing macropores and imidazole structure to reclaim valuable resources in the electroplating wastewater by coupling technology based on a chemical oxidation-reduction method, a precipitation method and an ion exchange method. The method comprises the following steps: firstly, Cr(III) is oxidized into Cr(VI) under basic condition through a chemical reaction; then, Zn, Cu, Ni and other heavy metal elements in the wastewater are transformed into precipitation of hydroxide; and finally, the Cr(VI) in the wastewater is adsorbed by the strong basic anion-exchange resin, the purified water quality achieves the requirement of electroplating pollutant discharge standard and recycle, and the Cr and other heavy metal resources in the electroplating wastewater can be comprehensively reclaimed and utilized. The method overcomes the defects that the prior regenerating process of porous weak-basic resin requires acidification, and the method has the advantages of simple process, low treatment cost, large treatment quantity and acid and base consumption conservation, and is the electroplating wastewater treatment method with green environmental protection and efficient utilization of resources.

Description

technical field [0001] The invention relates to a method for purifying electroplating wastewater and comprehensively utilizing resources. Background technique [0002] In recent years, my country's electroplating and tanning industry has developed rapidly, and many small and medium-sized enterprises have been established in various places. However, the environmental pollution caused by the waste discharged during the production process is also becoming more and more serious. According to incomplete statistics, the annual discharge of electroplating wastewater in my country is about 40×10 8 m 3 , mainly containing Cr(III), Cr(VI), Zn(II), Cu(II), Ni(III), Fe(III) and other heavy metal ions. Medical research shows that hexavalent chromium is a carcinogen, and the toxicity of Cr(VI) is 100 times greater than that of Cr(III). Chromium (VI) in wastewater is expressed as CrO with the difference of pH value 3 , CrO 4 2- , Cr 2 o 7 2- exist in other forms. Due to the high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01G37/14C01G37/00C22B7/00C22B19/30C22B15/00C22B23/00C22B21/00C02F1/72C02F1/42C02F101/20C02F101/22C02F103/16
CPCY02P10/20
Inventor 陈继邓岳锋龙涛祝丽荔刘英辉郭琳
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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