Recycling treatment process for recovering pure water and pure nickel from electro-nickelling rinsing wastewater

Abstract

The invention relates to a recycling treatment process for recovering pure water and pure nickel from electro-nickelling rinsing wastewater. The recycling treatment process adopts a variety of ion exchange resin-acid stabilizing nanofiltration membrane-cyclone electrolysis combined processes and has the advantages that pure water and metal nickel can be directly recovered from the wastewater, the nickel recovery rate is greater than or equal to 90%, the electrolytic nickel purity is greater than or equal to 99.95%, the wastewater recovery rate is greater than or equal to 70%, and the electrical conductivity of the recovered water is smaller than or equal to 10 micro-seconds / cm. Compared with other methods, the recycling treatment process is high in resource recovery rate and good in economic benefit, can ensure stable operation of a wastewater treatment system and the quality of recovered substances and is suitable for nickel recovery from nickel-containing wastewater and other nickel-containing industrial wastewater and wastewater recycling treatment in the electroplating industry, electronic industry and metallurgical industry.

Description

technical field [0001] The invention relates to a process for directly recovering pure water and pure nickel from electroplating nickel waste rinsing water, and belongs to the technical field of electroplating waste water resource treatment. Background technique [0002] At present, the technical methods used to treat nickel plating wastewater at home and abroad mainly include chemical methods, membrane methods and ion exchange methods. According to the requirements of the cleaner production law, electroplating enterprises have strict requirements on metal resource utilization rate and water saving rate. It is the basic requirement of electroplating wastewater treatment to realize the effective recovery of heavy metals and waste water recycling while electroplating wastewater treatment. [0003] (1) Chemical method: At present, some electroplating enterprises still use chemical method to treat nickel plating wastewater. The chemical treatment method is to add sodium hydroxid...

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Problems solved by technology

Therefore, the nickel-containing sludge produced by the chemical treatment method cannot be directly reused in the plating tank, but sent to the sludge recycling company for treatment. Due to the increasingly strict management of solid and hazardous waste transportation and treatment, the nickel recovery cost of this treatment method High, unable to obtain pure nickel directly

In addition, due to the need to add a large amount of chemical agents, the salt content of the wastewater will increase, the recycling cost of the wastewater will increase, and the water recovery rate will decrease.

[0004] (2) Membrane method: At present, although some electroplating enterprises directly use the reverse osmosis membrane method to recover heavy metals and wastewater, the recovery by the membrane method is the whole liquid recovery, and it is difficult to exclude the impurity components in the recovered solution. The recovered nickel sulfate solution will cause the bath Harmful impurities are accumulated, so it cannot be recycled for a long time. In addition, due to the low metal concentration of the recovered liquid, it needs to be evaporated when it is returned to the tank, and the energy consumption is high.

However, due to the limitations of the current ion exchange engineering application technology level, in most cases, the purification and purification of nickel in the process of nickel recovery from wastewater cannot be realized.

Therefore, the nickel recovery solution in the nickel plating wastewater cannot be directly returned to the plating tank for use, and the quality of the nickel-plated workpiece is guaranteed. The nickel recovery solution must be turned into nickel-containing sludge by neutralization and precipitation and then outsourced.

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