Polysilicon key consumables nominated for Torch Plan

The reporter learned from the Jiangxi Provincial Department of Science and Technology on January 18 that the annual output of 150,000 pieces of quartz ceramics demonstration production line for polysilicon undertaken by Jiangxi Sinoma Solar New Materials Co., Ltd. was included in the 2011 National Torch Plan. The construction of this demonstration project will break the monopoly of foreign products, thereby reducing the production cost of polysilicon and solving the bottleneck problem that restricts the polysilicon production in China's photovoltaic industry.

According to reports, the project adopts quartz ceramic injection molding technology with completely independent intellectual property rights, and has outstanding advantages in the preparation of large-size ceramic crucibles. Quartz ceramic crucibles for polycrystalline silicon ingots are currently the only containers for fused cast polysilicon that can be used for filling high-purity silicon materials, and are also irreplaceable key consumables in the polysilicon smelting and ingot casting process.

Due to the high purity of the raw material of the quartz ceramic crucible and the harsh environment of use, the production technology is difficult. At present, only a few companies in France, the United States, and Japan can produce such quartz ceramic crucibles, all using traditional grouting technology, and the technology is strictly confidential. Jiangxi Sinoma is the first company in the country and the fourth company in the world to master the production technology of quartz ceramic crucibles.

In May 2007, Jiangxi Sinoma adopted different injection molding technology from foreign companies to develop quartz ceramic crucibles for polycrystalline silicon ingots. The self-developed and constructed quartz ceramic crucible production line for polycrystalline silicon ingots was started in Xinyu. In April of the following year, the 720 type quartz polycrystalline silicon ingot for polycrystalline silicon ingots that was developed by the company passed the identification of key new products organized by Jiangxi Province. In August 2008, the company's second phase of an annual output of 30,000 quartz ceramic crucibles was started. On April 16, 2011, the third phase of the project was completed and ignited.

Over the past few years, through the integration of technology and equipment, Jiangxi Sinoma has successively obtained a series of scientific research achievements such as 900 large-size quartz ceramic crucibles, 1100 ultra-large-size quartz ceramic crucibles, and injection molding technology, and completed the rapid transformation of scientific and technological achievements. Realized the industrial application. At present, the company has formed an annual production capacity of 150,000 quartz ceramic crucibles, the crucible size up to 1100 mm × 1100 mm, 900 kg can be loaded, the average product pass rate of 75%.

It is reported that at present, there are more than 1,200 polysilicon smelting furnaces in China. According to the annual consumption of quartz ceramics from 150 to 180 pieces of smelting furnaces, about 200,000 pieces of silicon are needed annually. Existing domestic plutonium production lines are still unable to meet the development needs of the polysilicon industry.