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Method for treating high-concentration chemical nickel-plating wastewater with straight-chain carboxylic acid as organic ligand by using ferrate

A technology of ferrate and straight-chain carboxylic acid, applied in chemical instruments and methods, water/sewage treatment, metallurgical wastewater treatment, etc., can solve the problem of high catalyst cost, achieve no secondary pollution, good network breaking effect, easy The effect of preparation

Inactive Publication Date: 2021-06-01
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the existing chemical nickel-plating waste water in the processing method of complex state Ni needs the input of energy, the technical problem that the cost of catalyst is high, and provides a kind of treatment method containing high concentration and linear carboxylate with ferrate Method for electroless nickel plating wastewater with acids as organic ligands

Method used

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  • Method for treating high-concentration chemical nickel-plating wastewater with straight-chain carboxylic acid as organic ligand by using ferrate
  • Method for treating high-concentration chemical nickel-plating wastewater with straight-chain carboxylic acid as organic ligand by using ferrate
  • Method for treating high-concentration chemical nickel-plating wastewater with straight-chain carboxylic acid as organic ligand by using ferrate

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specific Embodiment approach 1

[0026] Specific embodiment one: present embodiment is a kind of method that ferrate is used to treat the electroless nickel plating waste water that contains high concentration and takes straight-chain carboxylic acid as organic ligand, is specifically carried out according to the following steps:

[0027] 1. Add ferrate to the wastewater to be treated, adjust the pH of the wastewater to 3~5, and stir for 2h~2.5h at the stirring speed of 550r / min~600r / min;

[0028] The wastewater to be treated is electroless nickel plating wastewater, and contains straight-chain carboxylic acid organic ligands;

[0029] The concentration of the ferrate in the wastewater to be treated is 5mmol / L~20mmol / L;

[0030] 2. Adjust the pH of the mixed solution in step 1 to 10-11 to precipitate free Ni, and then pass the mixed solution through an aqueous membrane to remove the precipitate, ie to complete the wastewater treatment.

specific Embodiment approach 2

[0031] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ferrate described in Step 1 is sodium ferrate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0032] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the ferrate described in step 1 is potassium ferrate. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for treating high-concentration chemical nickel-plating wastewater with straight-chain carboxylic acids as organic ligands by using ferrate, and relates to a method for treating the chemical nickel-plating wastewater with high-concentration straight-chain carboxylic acid organic ligands. The invention aims to solve the technical problems that energy input is needed and the cost of a catalyst is high in the existing method for treating the complexed Ni in the chemical nickel plating wastewater. According to the treatment method, complex breaking is carried out on actual high-concentration chemical nickel plating wastewater with straight-chain carboxylic acid as a ligand through ferrate chemical in-situ oxidation, and the content of Ni is reduced to 0.1 mg L<-1>. The ferrate has the functions of deodorization, color removal and flocculation, has very strong oxidability under the acidic condition, can oxidize organic matters and reduce the COD of the wastewater, and can completely remove Ni when the addition amount of the potassium ferrate is 5mmol / L, and the treated waste liquid does not contain Fe.

Description

technical field [0001] The invention relates to a method for treating electroless nickel-plating wastewater containing high-concentration straight-chain carboxylic acid organic ligands. Background technique [0002] Since Bernner and Riddle of the National Bureau of Standards accidentally discovered electroless plating (or self-catalyzed plating) in the 1940s, due to the simplicity and practicability of the electroless plating process, the electroless plating process has been used more and more in various industrial sectors. promotional application. Since the 1990s, with the rapid development of semiconductors, PCB printed circuit boards have been widely used in the electronics industry, and the scale of the electronics industry has expanded rapidly. In the production process of electronic components, due to the use of different straight-chain carboxylic acid complexing agents (EDTA, malic acid, citric acid, glycolic acid, succinic acid, tartaric acid, etc., among which EDT...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F101/20C02F103/16
CPCC02F1/5245C02F2101/20C02F2103/16
Inventor 罗旭彪谢观生邵鹏辉熊秀琴董浩杨利明石慧
Owner NANCHANG HANGKONG UNIVERSITY