Project Background and Challenges: An environmental protection company processes leachate from electronic waste, requiring the selective separation and recovery of high-purity copper from a complex acidic solution containing multiple ions such as copper, nickel, and zinc. The process involves multiple steps including extraction, back-extraction, and washing. The medium is highly corrosive (containing sulfuric acid and chloride ions), placing extremely high demands on the equipment's sealing, leak-proofness, and automated control.

Solution – Integrated PVC Rigid Panel Equipment Line:

1. Integrated Layout and Manufacturing: The entire production line, including 4 extraction tanks, 2 back-extraction tanks, 1 washing tank, and supporting PVC storage tanks, pipes, and valve stations, is entirely constructed using welded PVC rigid panels. The interior of each tank is divided into a "mixing chamber" and a "clarification chamber." The mixing chamber is equipped with a PVC turbine agitator, and the clarification chamber has an adjustable weir plate for interface control.

2. Automation and Intelligent Control: The entire line integrates online pH monitoring, automatic flow regulation, and automatic interface control instruments. All sensor interfaces, sight glasses, and lamp holes are perfectly sealed to the PVC tank via flanges or welding. The control center can monitor the operating status of each extraction tank in real time and automatically add extractant or adjust acidity.

3. Operational Results: This integrated production line, constructed entirely of PVC, fundamentally solves the comprehensive corrosion problem faced by metal equipment. The system operates stably, achieving a copper extraction selectivity of up to 99.5% and recovering copper with a purity exceeding 99.95%. Due to the excellent insulation and smooth surface of PVC, the equipment exhibits no electrochemical corrosion and minimal scaling, resulting in approximately 15% lower overall energy consumption compared to similar metal equipment lines. The success of this project provides a model of non-metallic solutions for continuous and automated separation engineering in complex corrosive media.