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Complex breaking agent for trivalent chromium passivation rinsing water, and preparation method and application thereof

A technology of trivalent chromium and rinsing water, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. The effect of interaction and simple preparation process

Active Publication Date: 2017-07-04
NANJING YUANQUAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] With the development of my country's industrial level, it is inevitable to replace hexavalent chromium with low-toxicity trivalent chromium passivation technology, but the comprehensive promotion of this process still needs to overcome the strong stability of trivalent chromium ions in passivation rinse water, and it is difficult to remove them up to standard question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A trivalent chromium passivation rinse water decomplexer, prepared by the following preparation method, including the following steps: weighing water-soluble metal salt ZnCl according to the amount of substances 1:0.5:1:0.2 2 , FeCl 2 , CaCl 2 , AlCl 3 , dissolved in deionized water, and prepared into a metal salt solution with a molar concentration of 0.6mol / L, according to 7% of the quality of the metal salt solution, adding a 2% PAM aqueous solution into the metal salt solution, stirring for 10- After 20 minutes until the cross-linking is complete, add 10% sulfuric acid to adjust the pH to 1-2 to obtain the trivalent chromium passivation rinse water complex breaking agent.

[0042] A method for treating trivalent chromium passivation rinse water with the above-mentioned trivalent chromium passivation rinse water decomplexer, the steps are as follows:

[0043] (1) The raw material trivalent chromium passivation rinsing water is purple-black, and the concentration o...

Embodiment 2

[0049] A preparation method of a trivalent chromium passivation rinse water complex breaker, comprising the following steps: weighing soluble metal salt ZnCl according to the molar concentration of 1:0.8:0.5 2 , CaCl 2 , AlCl 3 , dissolved in deionized water, prepared into a metal salt solution with a concentration of 1.0mol / L, according to 6% of the quality of the metal salt solution, adding a 2% PAM aqueous solution to the metal salt solution, stirring After 10-20 minutes until the cross-linking is complete, then add 10% sulfuric acid to adjust the pH to 1-2 to obtain a trivalent chromium passivation rinse water complex breaking agent.

[0050] A method for treating trivalent chromium passivation rinse water with the above-mentioned trivalent chromium passivation rinse water decomplexer, the steps are as follows:

[0051] (1) The trivalent chromium ion concentration of the raw material trivalent chromium passivation rinse water is 100 mg / L, the wastewater is purple-black, ...

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Abstract

The invention discloses a complex breaking agent for trivalent chromium passivation rinsing water. The complex breaking agent is prepared with water-soluble metal salts as raw materials, water as a solvent and PAM as a cross-linking agent through cross-linking, wherein the water-soluble metal salts are two or more selected from a group consisting of a water-soluble zinc salt, a water-soluble ferrous salt, a water-soluble ferric salt, a water-soluble calcium salt and a water-soluble aluminum salt. The invention also discloses application of the complex breaking agent to treatment of trivalent chromium passivation rinsing water. The complex breaking agent provided by the invention has the characteristics of simple preparation process, substantial effect and wide applicability. The metal cation and PAM of the complex breaking agent are cross-linked in a physical form; the PAM allows the metal cation to fully contact with complexed organic matters in waste water and promotes interaction between the metal cation and the complexed organic matters; and when applied to treatment of passivation rinsing water containing trivalent chromium in a complex state, the complex breaking agent can effectively remove trivalent chromium in the complex state in waste water and eliminate latent threat of trivalent chromium to water environments, and the removal rate of trivalent chromium can reach 99.9%.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of harmless treatment of electroplating wastewater, and in particular relates to a trivalent chromium passivation rinse water decontamination agent and a preparation method and application thereof. [0003] Background technique: [0004] For a long time, chromate passivation has been widely used in electroplating and surface treatment industries, but hexavalent chromium is highly toxic and carcinogenic, which seriously pollutes the environment. With the enhancement of people's awareness of environmental protection, the application of hexavalent chromium has gradually been strictly restricted, so it is imperative to research and develop non-toxic or low-toxic substances to replace chromate passivation process. At present, positive progress has been made in chromium-free passivation and trivalent chromium passivation, and trivalent chromium passivation has been widely used in production. However, in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F9/04C02F101/22C02F103/16
CPCC02F1/5236C02F1/56C02F1/66C02F9/00C02F2101/22C02F2103/16
Inventor 刘航蔡大牛李瑞鹏
Owner NANJING YUANQUAN TECH CO LTD
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