Electrolysis recovery method of nickel in waste water

Abstract

Disclosed is an electrolysis recovery method of nickel in waste water. The method includes steps of: firstly, selecting 1000-1500 parts of waste water containing nickel, using sodium hydroxide flakes to regulate PH in a range of 1-6; secondly, adding 0.01-0.05 parts of polyethylene glycol, 0.03-0.06 parts of thiourea, 0.01-0.015 parts of at least one of sodium dodecyl sulfate, chloral hydrate, para toluene sulfonamide and saccharin, maintaining a system temperature at 50-80 DEG C, controlling current to in a range of 1.0-5.0A and starting electrolysis with stirring, maintaining the PH the same as that in the first step through adding the sodium hydroxide flakes, and controlling electrolysis time in a range of 12-24 hours; and thirdly, using sodium hydroxide flakes again to regulate the PH in a range of 6-10, adding 0.15-0.3 parts of at least one of sodium monophosphate and gelatin, maintaining the system temperature continuously, controlling current to in a range of 1.0-5.0A and starting electrolysis with stirring, and controlling electrolysis time in a range of 8-16 hours. The electrolysis recovery method of the nickel in the waste water is high in applicability, simple and convenient, low in cost; and can obtain metallic nickel directly.

Description

technical field [0001] The invention relates to the technical field of metal recovery in waste water, in particular to a process for recovering nickel in waste water. Background technique [0002] With the rapid development of the national economy and the continuous improvement of people's living conditions, the demand for electronic products such as household appliances, mobile phones, and video players is also increasing, and the demand for circuit boards, one of its core components, is also increasing day by day. . However, since the circuit board industry will produce a large amount of heavy metal wastewater in the production process, the effective disposal of these heavy metal wastewater has become a major problem facing economic development. Nickel-containing wastewater is one of the main wastewater in the circuit board industry, with an annual production of millions of tons. Nickel pollution can cause dermatitis, tracheitis, and even pneumonia. Nickel has an accumula...

AI Technical Summary

Problems solved by technology

Summarizing these methods, it can be found that not only the operation is complicated and the cost is high, but also only for a certain kind of nickel-containing waste water, and the nickel-containing waste liquid discharged from many electronic factories is a mixed waste liquid of the two. Therefore, one can directly recover nickel-containing waste water. Wastewater and convenient, low-cost methods are particularly important

[0005] The recovery of nickel-containing wastewater mainly has the following three difficulties: first, the content of nickel in nickel-containing wastewater is generally not high, and exists in different forms, including ionic state and complex state, and the treatment methods are different, and the treatment cost Secondly, the impurity composition is complex and the content is extremely high, such as the phosphorous and ammonia nitrogen contents in the electroless nickel plating aging solution are very high, and the chloride ion and boric acid contents in the nickel electroplating wastewater are also very high. The existence of these impurity components makes the waste The recovery and treatment of nickel in the liquid is very difficult; again, the water quality of nickel-containing wastewater cannot be kept stable, which requires judging the treatment method and the dosage of chemicals according to the actual situation