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Selective separation and comprehensive recovery method for nickel in alkali chemical nickel waste water

A recovery method and chemical nickel technology, which are applied in chemical instruments and methods, optics, water pollutants, etc., can solve the problem that the effluent is difficult to achieve the standard, and achieve the increase of the adsorption concentration ratio, the increase of the utilization rate of the regenerant, and the low cost. Effect

Active Publication Date: 2017-11-07
NANJING UNIV
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Problems solved by technology

Although this method can effectively recover nickel in low-concentration wastewater, it has no selectivity for the adsorption of nickel, and it is still difficult to meet the standard for effluent
Although the above methods can realize the recovery of nickel, each has its own limitations.

Method used

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  • Selective separation and comprehensive recovery method for nickel in alkali chemical nickel waste water
  • Selective separation and comprehensive recovery method for nickel in alkali chemical nickel waste water
  • Selective separation and comprehensive recovery method for nickel in alkali chemical nickel waste water

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Embodiment Construction

[0041] In order to further explain the content of the present invention, the present invention is described in detail in conjunction with examples, and these examples are only suitable for illustrating the present invention and do not limit the application scope of the present invention.

[0042] Application of the present invention to process alkaline chemical nickel waste water and aging liquid of enterprise A, the water quality analysis of alkaline chemical nickel waste water and aging liquid in enterprise A is as shown in Table 1.

[0043] Table 1 Water quality analysis of low temperature alkaline chemical nickel workshop wastewater and aging solution

[0044]

[0045]

[0046] Among them, the phosphorus content in the form of hypophosphite in the wastewater is 125mg / L. Through Visual MINTEQ software analysis, it can be seen that the main complexed form of Ni is NiNH 3 + and Ni(NH 3 ) 2 + .

[0047]1. "Class I large-capacity adsorption + Class II selective adso...

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Abstract

The invention discloses a selective separation and comprehensive recovery method for nickel in alkali chemical nickel waste water, and belongs to the field of heavy metal waste water treatment. The method mainly comprises the steps that 1, a I-stage large capacity adsorption and II-stage selective adsorption combined process is adopted for separating Ni in the alkali chemical nickel waste water, and effluent can be reused directly; 2, applied resin is regenerated by taking diluted acid as regenerant and adopting a cyclic preregeneration mode; 3, a high-acid high-Ni adsorption solution is mixed with an alkali chemical nickel ageing solution, Ni of multiple forms is recycled through a neutralization precipitation method or an electrocatalytic reduction method, Ni standard treatment and wash water reuse are achieved mainly through the two-stage combined process of large capacity adsorption and selective adsorption, the utilization rate of the regenerant is increased by adopting the cyclic preregeneration method, and the concentration of a desorption solution is increased; by means of 'waste control by waste' of the alkali chemical nickel ageing solution, the purposes that the strong-acidity high-concentration desorption solution is disposed at a low cost, and the nickel resource is recycled efficiently and comprehensively are achieved.

Description

technical field [0001] The invention discloses a selective separation and comprehensive recovery method for nickel in alkaline chemical nickel wastewater, belonging to the field of resource treatment of heavy metal wastewater. Background technique [0002] Alkaline electroless nickel plating has the advantages of wide adaptability, good stability of plating solution, fast plating speed and high coating quality, and has become an ideal system to replace acidic electroless nickel plating. However, the large amount of washing water consumption caused by the cleaning of the plated parts and the high-concentration waste liquid discharge caused by the aging of the plating solution have greatly limited the application of alkaline electroless nickel plating. Therefore, how to effectively realize the water saving and pollution reduction of alkaline electroless nickel plating has become a key point in the promotion of this technology. Nickel is a carcinogenic and allergenic pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/42C02F1/28C22B7/00C22B23/00C25C1/08
CPCC22B7/006C22B23/00C25C1/08C02F1/285C02F1/42C02F2101/20C02F2001/422C02F2001/425C02F2303/16
Inventor 刘福强赵伟仇欢杜建伟韦蒙蒙赵旭魏东洋罗堃温勇李爱民
Owner NANJING UNIV
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