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Nickel-containing electroplating wastewater treatment and nickel recovery method

A treatment method, nickel electroplating technology, which is applied in the field of industrial wastewater treatment and recycling, can solve the problems of slow exchange rate, difficulty in reaching the standard stably, and incomplete regeneration, so as to reduce the loss of metal nickel, improve economic benefits, and reduce treatment costs. cost effect

Active Publication Date: 2015-04-29
SHENZHEN QIANHAI ZHONGSHENG ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods have certain limitations. The chemical precipitation method occupies a large area and is difficult to reach the standard stably; the concentration of the concentrated liquid by the RO membrane concentration method is not high. The treatment of electroplating wastewater and the effect of nickel recovery are not satisfactory

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  • Nickel-containing electroplating wastewater treatment and nickel recovery method
  • Nickel-containing electroplating wastewater treatment and nickel recovery method

Examples

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example 1

[0031] Example 1: The preparation steps of this example include:

[0032] 1) Weigh 5kg ion-exchange fibers and load them into 3 ion-exchange fiber columns on average;

[0033] 2) Lift by pump, absorb and treat 200L of nickel-containing electroplating wastewater with a concentration of 446mg / L, through continuous monitoring,

[0034] The nickel concentration in the effluent water is lower than 0.1mg / L, reaching the standard;

[0035] 3) Regenerate the adsorbed ion-exchange fiber with an appropriate amount of regenerant, and add 150 g of oxalic acid to the concentrated solution to form a nickel oxalate precipitate;

[0036] 4) After the nickel oxalate precipitate is press-filtered, it is dried for 4 hours at 450°C under high-temperature anaerobic conditions;

[0037] 5) The quality of the prepared pure nickel powder is 85.3g, and the recovery rate is 95.63%.

example 2

[0038] Example 2: The preparation steps of this example include:

[0039] 1) Weigh 50kg ion-exchange fibers and load them into 3 ion-exchange fiber columns on average;

[0040] 2) Through pump lifting, adsorption treatment of 3000L nickel-containing electroplating wastewater with a concentration of 392mg / L, through continuous monitoring, the concentration of nickel in the effluent water is lower than 0.1mg / L, which is up to the standard;

[0041] 3) Regenerate the adsorbed ion-exchange fiber with an appropriate amount of regenerant, and add 2000g of oxalic acid to the concentrated solution to form a nickel oxalate precipitate;

[0042] 4) After the nickel oxalate precipitate is press-filtered, it is dried for 4 hours at 450°C under high-temperature anaerobic conditions;

[0043] 5) The quality of the prepared pure nickel powder is 1132g, and the recovery rate is 96.26%.

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Abstract

The invention relates to a nickel-containing electroplating wastewater treatment and nickel recovery method, which comprises a nickel-containing electroplating wastewater treatment process and a nickel recovery process. The nickel-containing electroplating wastewater treatment process comprises the following steps: passing nickel-containing electroplating wastewater through a bag filter to remove impurities in the wastewater; sending the impurity-removed wastewater into an ion-exchange fiber system to perform exchange adsorption, and discharging effluent water after reaching the standard; and after the ion-exchange fiber achieves a saturated adsorption state, regenerating with a regenerant to obtain a high-concentration nickel concentrated solution. The nickel recovery process comprises the following steps: adding acid or alkali to regulate the pH value of the nickel concentrated solution to a proper range, adding a proper amount of precipitant, stirring to sufficiently react to form a nickel-containing precipitate, and carrying out pressure filtration and high-temperature oxygen-free drying on the precipitate to obtain high-purity nickel powder which can be directly reutilized. The technique can recover nickel from the nickel-containing electroplating wastewater on the premise of ensuring the electroplating wastewater to be discharged after reaching the standard, has the advantages of adjustable scale, simple process route, low energy consumption, high nickel recovery rate and no secondary pollution, and has favorable economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment and recycling, and relates to a method for treating electroplating wastewater and recovering metal ions, in particular to a method for treating nickel-containing electroplating wastewater and recovering nickel. Background technique [0002] Metal nickel is a relatively expensive non-ferrous metal and is widely used in the electroplating industry. Correspondingly, a large amount of nickel-containing wastewater often flows out in the nickel plating industry, which not only causes serious pollution to the environment, but also causes a lot of waste of metal resources. In the treatment process of electroplating wastewater, chemical precipitation method (patent number: 201410265810.X), RO membrane concentration method (patent number: 200920204407.0), and ordinary ion exchange method (patent number: 201120354275.7) are often used to treat nickel-containing electroplating wastewate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B7/00C25D21/20
CPCY02P10/20
Inventor 周从章朱明星王卫强臧会山汪淑娟刘晓李媛媛赵曼冯世业李龙博
Owner SHENZHEN QIANHAI ZHONGSHENG ENVIRONMENTAL PROTECTION TECH