Technology & Equipment

Name: Silicon tetrafluoride (STF) production technics and core reaction equipment

Technical Background: 
      With the rapid development of photovoltaic industry and under the background of the European anti-dumping policy, polysilicon industry, the upper grade products of a photovoltaic production, is now growing steadily. 

Technology introduction: 

      Polysilicon preparation by silane method is a kind of technology which has been widely used in the world in recent years. Compared with the traditional technique, it has the advantages of low energy consumption, environmental protection and low raw material cost. As the core intermediate product of polysilicon preparation technology by silane method, the quality of silicon tetrafluoride directly affects the purity and price of polysilicon products. 

     Combined with its mature experience in fluorine chemical industry and by putting lots of manpower and material resources in technological research and development in this aspect, Xi'an Sunrise group has devoted itself in silicon tetrafluoride processing and production. The company has successfully mastered the sulfuric acid method and the technology of thermal cracking of sodium fluorosilicate to generate silicon tetrafluoride, gained the ability of designing and producing the ancillary production equipment. The company obtained multiple patents in this field, and its technologies and products have been successfully applied in many polysilicon production projects at home and abroad.

Advantages:

（1）The STF reaction system is a positive pressure system, which can completely isolate oxygen, eliminate the safety hazards of the subsequent system and control the generation of fluorosilane.

（2） Silicon tetrafluoride has high product pureness but with low production cost.

（3）The device operation is flexible.

（4）A Few Solid by-products will be generated in the process, and can be reused as raw materials in other industries because of its high pureness.