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Treatment method of chemical nickel-plating wastewater

A technology of electroless nickel plating and wastewater treatment, which is applied in metallurgical wastewater treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., and can solve problems such as resource waste, environmental pollution, and wastewater that cannot meet the national first-level discharge standards.

Active Publication Date: 2012-01-25
中新联科环境科技(安徽)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wastewater treated by these methods cannot meet the national first-level discharge standard (nickel ion concentration < 0.1ppm), which will not only cause environmental pollution, but also cause waste of resources

Method used

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  • Treatment method of chemical nickel-plating wastewater
  • Treatment method of chemical nickel-plating wastewater
  • Treatment method of chemical nickel-plating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1 Before the present invention, Nanya Copper Foil (Kunshan) Co., Ltd. used physicochemical, flocculation, and precipitation treatment methods to treat copper-plated nickel-containing waste water, with a daily treatment capacity of 25m 3 , the water quality after treatment is shown in Table 1 below, which did not reach the standard.

[0039] Table 1 Water quality data after the traditional method of treating nickel-containing wastewater

[0040] Project (PPM)

pH value

Conductivityμs / cm 2

Ni

COD

limit value

7～9

＞6000

≤10

≤1000

[0041] Afterwards, this factory adopts process of the present invention to carry out pilot test to aforementioned nickel-containing waste water, and this process comprises five steps:

[0042] (1) Electroless nickel plating waste bath liquid or electroless nickel plating washing water is treated separately, or the two waste liquids are mixed, and then enter the strong alkali...

Embodiment 2

[0051] Xinxing Tongtai Technology (Kunshan) Co., Ltd. also adopts the process of the present invention to process the scrap electroless nickel plating bath and washing water, and its process is basically the same as that of Example 1.

[0052] The quality and quantity of wastewater before treatment are as follows:

[0053] The amount of waste water is 250 tons / month (including bath liquid and washing water)

[0054] Water quality profile:

[0055] Scrap tank solution Nickel ion concentration 2429ppm

[0056] Washing water Nickel ion concentration 16ppm

[0057] 1 part of waste bath liquid mixed with 40 parts of washing water for analysis

[0058] Ni: 80ppm PH value: 1.86

[0059] Pilot test treatment capacity 0.2m 3 / h.

[0060] During this process, the content of nickel ions in the wastewater in each process was monitored by ICP, and the data are shown in Table 3 below.

[0061] Table 3 Data of nickel content in each process wastewater in nickel-containing wastewater tre...

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Abstract

The invention discloses a treatment method of chemical nickel-plating wastewater. The method comprises the following steps: (1) treating nickel-plating wastewater with strongly basic anion-exchange resin so as to destabilize nickel complex; (2) adsorbing nickel ions contained in the nickel-plating wastewater with strongly acidic cation-exchange resin; (3) adding a strong oxidant in the nickel-plating wastewater so that hypophosphite, phosphite and macromolecular organic acid complexing agent which are contained in the wastewater are oxidized so as to form phosphate and organic micromolecules;(4) carrying out pulse electrocoagulation on the nickel-plating wastewater so that the phosphate forms iron phosphate to be precipitated and residual nickel ions are oxidized to form oxidized scale precipitate at the same time; and (5) regulating the wastewater to alkalinity so that iron ions in the wastewater are precipitated, successively adding a deironing agent and a flocculant to remove ferrous ions and suspended matters in the wastewater, and directly discharging supernate. According to the invention, the content of the nickel ions in the wastewater treated by the process is far less than 0.1ppm and meets a national primary standard, the recycle of nickel resources can be realized, and the economic benefits of wastewater treatment are improved.

Description

technical field [0001] The invention particularly relates to a method for treating nickel-containing wastewater discharged from industries such as printed circuit boards (PCBs) and electroplating, and realizing resource recovery and recycling. Background technique [0002] Electroless nickel plating is a surface treatment technology that effectively improves the corrosion resistance and wear resistance of workpieces. It has been widely used in many industries including printed circuit boards (PCB), metal plating and chemical industry. The main components of the existing electroless nickel plating solution are reducing agent sodium hypophosphite and various organic acid complexing agents such as citric acid, lactic acid, malic acid, pH value regulator, etc., especially its stability is poorer than electroplating nickel, Usually use about 5 cycles (M.T.O) to age and scrap. Therefore, the chemical nickel plating waste bath solution and washing water are characterized by high p...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/16C02F1/42C02F1/72
Inventor 冯云香
Owner 中新联科环境科技(安徽)有限公司
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