Silicon block cleaning and drying device

Abstract

The invention provides a silicon block cleaning and drying device. The silicon block cleaning and drying device comprises a cleaning unit, a drying unit and a cooling unit, wherein the cleaning unit is used for conducting cleaning treatment on the surface of a silicon block after being broken, the drying unit is used for conducting drying treatment on the silicon block after cleaning is completed, and the cooling unit is used for conducting cooling treatment on the silicon block after drying is completed. According to the silicon block cleaning and drying device, the silicon block can be sufficiently cleaned to remove residue and scratches on the surface of the silicon block.

Description

technical field [0001] The invention relates to the technical field of silicon production, in particular to a silicon block cleaning and drying device. Background technique [0002] Polysilicon is the building block material for the solar photovoltaic industry. At present, the production of polysilicon mainly adopts the improved Siemens method (that is, the reduction method of trichlorosilane), which refers to the use of vapor deposition method in the reduction furnace through H 2 to reduce SiHCl 3 Thereby preparing polysilicon rods, the specific reaction equation is: [0003] 3SiHCl 3 +H 2 →2Si+5HCl+SiCl 4 [0004] The polycrystalline silicon rods produced by the improved Siemens method are transported to the product finishing process through the transfer box, and the silicon rods are first taken out of the transfer box, and then on a specific platform, the rod-shaped products are broken into a certain linear size that meets the customer's requirements. lumpy product...

AI Technical Summary

Problems solved by technology

[0006] However, since polysilicon is a high-purity product, during the crushing process, metal impurities will adhere to the surface of the silicon block due to contact with equipment, air, and personnel, and thus be polluted by metal impurities, resulting in excessive metal content on the surface of polysilicon, which in turn leads to polysilicon The quality of the downstream products produced by the product is unqualified, which affects the operating efficiency of the enterprise

In addition, during the crushing process, silicon powder will remain on the surface of the silicon block due to friction between the silicon blocks, and even scratches will occur, which will affect the appearance quality of the polysilicon, and the poor appearance will cause customers to question the product quality, which is not conducive to product quality. Sales

However, the metal impurities, residual silicon powder and scratches attached to the surface of the silicon block cannot be completely removed only by the surface cleaning process.

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