Method for treating electroless nickel-plating wastewater through combination of hydrogen-peroxide oxidation and ion exchange adsorption
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An ion exchange adsorption, chemical nickel plating technology, applied in ion exchange water/sewage treatment, chemical instruments and methods, water/sewage treatment and other directions, can solve the problems of low nickel recovery rate, poor treatment effect, high treatment cost, and achieve The effect of avoiding secondary pollution, reducing treatment costs, and protecting loss
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[0006] The purpose of the present invention is to provide a method for treating electroless nickel-plating wastewater by combining hydrogen peroxide oxidation and ion-exchange adsorption. question
Method used
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example 1
[0031] Example 1: The preparation steps of this example include:
[0032] 1) 8L, 21.50mg / L electroless nickel plating wastewater, add 10mL, 98% sulfuric acid to adjust the pH value of the wastewater to 2.05;
[0033] 2) Add 28mL, 50% hydrogen peroxide, control the ORP value of the wastewater at 600mV-700mV, and stir for 3 hours;
[0034] 3) Weigh 100g of ion-exchange fibers and load them into two ion-exchange fiber columns on average;
[0035] 4) The electroless nickel plating wastewater after the oxidation reaction is treated by adsorption through the pump. Through continuous monitoring, the nickel concentration in the effluent is always lower than 0.1mg / L, which is fully up to the standard.
example 2
[0036] Example 2: The preparation steps of this example include:
[0037] 1) 1125L, 21.40mg / L, pH value of 1.50 electroless nickel plating wastewater, add 750g of sodium hydroxide to adjust the pH value of the wastewater to 2.68;
[0038] 2) Add 3.75L, 50% hydrogen peroxide, control the ORP value of the wastewater at 600mV-700mV, and stir for 3 hours;
[0039] 3) Weigh 10kg of ion exchange fibers and load them into 2 ion exchange fiber columns on average;
[0040] 4) The electroless nickel plating wastewater after the oxidation reaction is treated by adsorption through the pump. Through continuous monitoring, the nickel concentration in the effluent is always lower than 0.1mg / L, which is fully up to the standard.
[0041] 5) Regenerate the adsorbed ion-exchange fiber with an appropriate amount of regenerant, and add 30 g of oxalic acid to the concentrated solution to form a nickel oxalate precipitate;
[0042] 6) After the nickel oxalate precipitate is press-filtered, it is ...
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Abstract
The invention provides a method for treating electroless nickel-plating wastewater through the combination of hydrogen-peroxide oxidation and ion exchange adsorption in order to solve the problem that nickel ions are difficult to stably and standardly discharge in the existing electroless nickel-plating wastewater treatment. The method includes the following steps that 1, the hydrogen-peroxide oxidation method is used for decomposing a complex compound, wherein sulfuric acid or sodium hydroxide is poured in electroless nickel-plating wastewater firstly, the pH value is adjusted to 2.0-3.0, a proper amount of hydrogen peroxide is poured to decompose a complexing agent in the wastewater and nickel ions are thus separated from the complexing agent to be in an ionic state; 2, the ion exchange adsorption method is used for treating nickel ions, wherein after being subjected to oxidation and complex compound decomposing, the electroless nickel-plating wastewater passes through a multi-medium filter, impurities in the wastewater are removed, after impurity removal, the wastewater enters a heavy metal exchange adsorption system for exchange adsorption, the nickel ions in the wastewater are removed, effluent can reach discharge standards, exchange adsorption is conducted on the nickel ions on ion exchange fibers, and then eluting, precipitation and thermal decomposition are conducted for recycling. According to the method, it can be effectively ensured that the nickel ions subjected to electroless nickel-plating wastewater treatment are stable and reach the 'emission standard of pollutants for electroplating' (GB21900-2008), at the same time, nickel in wastewater is recycled, the process is simple, operation and management are convenient, and no secondary pollution is caused.
Description
technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a method for treating nickel-containing wastewater, in particular to a method for treating electroless nickel-plating wastewater. Background technique [0002] Electroless plating, also known as "electroless plating", occupies an important position in surface treatment technology because of its advantages of uniform coating thickness and pinhole rate, and is one of the fastest-growing surface treatment technologies in recent years. Electroless nickel plating has uniform coating, high hardness, and good chemical stability. At the same time, the electroless nickel plating process is simple, high production efficiency, low cost, and has many superior characteristics. It has been widely used in aerospace, automotive, electronics, machinery and precision Instrument manufacturing and other fields. [0003] In order to improve the stability of the plating solution...
Claims
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