Achieving High-Value Utilization of Waste Zinc in Galvanizing Processes

Sun Beam Metal provides hot-dip galvanizing services for screws and nuts in Taiwan. However, the hot-dip galvanizing process generates a large amount of zinc dross, and the industry has struggled to find a stable and environmentally friendly recycling solution. To address this, Sun Beam Tech. was established to specialize in the recycling of waste zinc from the galvanizing process.

Waste Zinc Recycling

Sun Beam Tech. utilizes high-temperature refining to convert waste zinc into high-purity refined zinc ingots, which serve as raw materials for producing copper and zinc alloy products. These include copper fittings, zinc alloy faucets, and other items. Additionally, Sun Beam Tech. employs a dry process (as opposed to the more polluting wet chemical method) to convert the refined zinc ingots into high-purity zinc oxide. This product holds an 80% market share in Taiwan and is widely used in electronics, ceramics, tires, footwear, feed, and pharmaceuticals. Clients include tire manufacturers such as Cheng Shin, Nankang, Kenda, Bridgestone, and Kumho.

Process Heat Recovery

In collaboration with the Metal Industries Research & Development Centre, Sun Beam Tech. has implemented a thermal energy storage combustion system and a heat exchange system for zinc oxide within the plant. This system recycles the process-generated hot gasses, conducting secondary combustion to significantly reduce natural gas consumption.

▪ The waste zinc dross from the hot-dip galvanizing process can be 100% recycled into marketable zinc ingots and zinc oxide, which reduces waste disposal costs.