The electroplating industry is a cornerstone of the manufacturing industry, but efficient treatment of nickel plating wastewater and nickel resource recovery have long been a pain point. Although the traditional chemical precipitation method can barely meet the standards, it produces a large amount of hazardous waste sludge and wastes precious nickel resources. Faced with increasingly stringent environmental regulations and the pressure of resource scarcity, companies urgently need green, efficient, and resource-recycling solutions. Solvent extraction is becoming a revolutionary solution for nickel plating wastewater treatment.
How to Treat Nickel Electroplating Wastewater?
- Nickel Extraction
Experiments have shown that using P204-kerosene as the extraction agent and Tiei Extraction's new CWL-M centrifugal extractor as the extraction and separation equipment, after three-stage countercurrent extraction, Ni2+ can be effectively extracted from chemical nickel plating waste liquid, with an extraction rate of more than 96%. - Nickel Stripping
To extract nickel from the nickel-rich organic phase, experiments have shown that the CWL-M centrifugal extractor achieves a 100% extraction rate after the first stage of extraction. At this point, the Ni2+ concentration in the extract reaches 5.07 g·L-1.4. - Regeneration of P204
The extraction rate and other properties of the P204 after stripping were tested. The results showed that the performance of the regenerated P204 was exactly the same as that of the fresh P204 and could be recycled. - Comprehensive Utilization of Nickel
40% NaOH was added to the nickel-containing stripping solution until the pH was greater than 10 to produce Ni(OH)2 precipitate. The solution was filtered and washed with distilled water 3-4 times until the pH of the washing solution reached 7-7.5 and no NH4+ was present. The solution was filtered and a 1:1 H2SO4 solution was added to the filter cake to dissolve the solution. The solution was concentrated and filtered to remove impurities. The filtrate was further concentrated and cooled to precipitate crystals. The product was then dried at 40-50°C to obtain the finished NiSO4·6H2O product. The product was tested and the results were found to be superior to the technical requirements of industrial-grade nickel sulfate. - Conclusion
P204 is used as an extractant to extract nickel from chemical nickel plating waste liquid, and the raffinate is stripping with sulfuric acid to produce industrial-grade nickel sulfate: the method is simple, easy to operate, the extractant can be recycled, the cost is low, and the purpose of environmental control and waste utilization is achieved.
Centrifugal Extractor: The Core of the Solvent Extraction Process
Whether the advantages of solvent extraction can be fully utilized depends on the extraction equipment! Traditional mixer settler or extraction column have problems such as low efficiency, large space, high solvent carryover, and complex operation. Tiei Extraction Centrifugal Extractor has completely revolutionized the extraction process with its revolutionary design:
- Closed operation: Fully enclosed design effectively controls VOCs emission, ensures a safe operating environment, and complies with occupational health and environmental protection requirements.
2. Efficient mass transfer: The powerful centrifugal force generated by high-speed rotation realizes instantaneous efficient mixing and rapid separation of two phases. The single-stage efficiency is comparable to that of multi-stage traditional equipment.
3. Continuous countercurrent operation: Multi-stage series connection realizes true continuous countercurrent extraction with large processing capacity and nickel recovery rate of up to 99%+.
4. Extremely low solvent carryover: Strong centrifugal force ensures rapid and thorough separation of the two phases, and the solvent loss rate can be controlled below 0.1%, significantly reducing operating costs.
5. Extremely small footprint: Modular design, with the same processing capacity, the footprint is only a fraction of that of traditional equipment, saving valuable factory space.
6. High degree of automation: Integrated PLC/DCS control system, realizing one-button start and stop, parameter monitoring and automatic adjustment, easy operation, stable operation, and reduced dependence on manual labor.
Faced with high pressure on environmental protection and resource challenges, nickel plating wastewater treatment has entered the era of "resource utilization". Tiei extraction centrifugal extractor provides an efficient, economical and sustainable solution for electroplating companies.
Email: sales@tieiextraction.com
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