Sigma has been a metal scrap trader since 1978, and is among one of the first few companies from the Greater China Region to have joined ISRI and BIR in the 1980’s. We are now the largest aluminum scrap importer in the Greater China Region, importing more than 10% of the total import volume.
With our numerous years of extensive trading, we have built up our reputation within the industry and now have a large supplier base. Our purchase of raw material is based on ISRI specifications such as Tense, Taint/Tabor, Twitch, Telic, Honey, Birch/Cliff, etc. Taking aolvantage of the abundance of human resources in China, our Shanghai plant also hand sorts Zorba.
To further increase our processing efficiency, we have installed a small heavy media plant to segregate aluminum from Zorba fines. We also installed 8 briquetting machines for Taint/Tabor in order to increase the recovery during smelting. In addition, we installed a state-of-the-art Telic processing line that consumes over 4,000 mt of aluminum turnings per month.
Leadership in Recycling
As the industry leader we are constantly seeking out new technology that can be introduced into our smelting process to increase fuel efficiency, metal yield, and product quality. Most of the scrap handling and smelting equipment, tailor-made to our specific needs, are developed in-house by our engineering staff.
Permanent-Magnet Stirrer Through the joint effort between Sigma and Zmag Ltd. we have implemented the world’s first Permanent-Magnet Stirrer. Since the performance of this new stirrer technology was so successful, we have installed the Permanent-Magnet Stirrer in all of our holding furnaces.
Heat Exchanger We have installed highly efficient Heat Exchangers in all of our furnaces to aid in the recovery and reuse of heat energy from the exhaust air. It helped not only boost our fuel efficiency, but also reduced the air pollution caused by incomplete burning.
Computerized Control Center We utilize state-of-the-art computer technology to monitor and control all of our furnaces from three control centers situated inside the smelting plant. From these control centers we can monitor and control the furnace temperature, pressure, valves, fuel consumption, and also optimize bag-house operations.
aluminum scrap importer in the Greater China Region, importing more than 10% of the total import volume.
plant also hand sorts Zorba.
