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Raw Materials |
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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. Due to our numerous years of extensive trading, we have built up our reputation within the industry and now have a large global supplier base. Our purchase of raw material is based on ISRI specifications such as Tense, Taint/Tabor, Zorba, Twitch, etc.
To further increase our processing efficiency, we have installed 3 heavy media plants to segregate shredded mixed metals and fines in Shanghai, Chongqing, and Rizhao. We have also installed 4 shredding plants for more accurate inspection and faster segregation in the Shanghai, Zhangzhou, Chongqing, and Rizhao plants plant also hand sorts Zorba.
Sigma Group has developed a world-wide scrap acquisition network, while domestically procured raw material is mainly silicon metal, primary aluminum, copper, production scrap, and scrap aluminum from major domestic scrap markets. All the imported metal scrap is purchased through our offices in Taiwan, the United States, and Japan. We are one of the largest aluminum scrap importers in the Greater China Region. |
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Leadership in Recycling |
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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.
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