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| Silicon
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Production Technologies
We use metallurgical silicon as a raw material to produce TCS, which is then used to produce polysilicon. This technology enables a high degree of hydrogen, HCI, TCS and STC to be recycled and re-used during the production process, thereby reducing waste output and lowering raw material cost. Our continuous closed-loop process is designed to increase production capacity per reactor, while reducing overall energy consumption and capital investment for a given level of production. Our advanced distributed control system, or DCS, improves production capacity and safety while reducing human-resource related operating expense. Our production process, including production, cleaning, packaging and transportation, conforms to relevant international standards and our comprehensive waste management system is compliant with national environmental protection standards.
Production Process
We use modified Siemens process for our polysilicon production. Our polysilicon production process starts with mixing HCl with a bed of silicon powder in a reactor which produces TCS. TCS is then purified through distillation and the by-product STC is converted back into TCS for re-use as a production input, and hence recycled in what is known as a closed-loop process. Next, high-purity silicon rods are exposed to purified TCS gas in a hydrogen environment at 1,080ºC, allowing TCS gas to decompose and deposit additional silicon onto the rods. When the rods eventually grow to desired diameters, they are removed from the reactor and moved to a clean area for further processing. Finally, the rods are broken into chunks, impurities are segregated and the ultra pure polysilicon chunks are then used for our wafer production. |
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