Polishing treatment method for solar grade monocrystal silicon bar

Abstract

The invention relates to a polishing treatment method of a solar-grade single crystal silicon rod. The method comprises the following the steps: soaking the solar-grade single crystal silicon rod into acid liquor with lower concentration of hydrofluoric acid, removing a damaged layer and eliminating the stress of the solar-grade single crystal silicon rod; and then mechanically sanding and polishing the surface of the solar-grade single crystal silicon rod by polishing equipment. Due to low requirements for the concentration and the purity of the acid, the invention can use waste acid liquor for production to improve the utilization rate and decrease the cost; moreover, the erosion time does not need to be accurately controlled, and a corrosion pit phenomenon can not occur so that the rate of finished products is improved.

Description

Technical field [0001] The invention relates to a polishing treatment method for a solar-grade monocrystalline silicon rod. Background technique [0002] At present, when we polish solar-grade monocrystalline silicon rods, we usually use acid solution corrosion method, that is, soak solar-grade monocrystalline silicon rods in acid solution with a concentration of more than 99%. The requirements are high, and it will be treated as waste acid after several times of use. The waste acid treatment is difficult, poor in environmental protection, and high in cost. In addition, it needs to be turned frequently during the soaking process, and the corrosion time needs to be accurately controlled, otherwise the corrosion will be excessive and corrosion pits will easily appear. Phenomenon, the consistency of product quality is poor. Contents of the invention [0003] The purpose of the present invention is to provide a method for polishing solar-grade monocrystalline silicon rods tha...

AI Technical Summary

Problems solved by technology

[0002] At present, when we polish solar-grade monocrystalline silicon rods, we usually use acid solution corrosion method, that is, soak solar-grade monocrystalline silicon rods in acid solution with a concentration of more than 99%. The requirements are high, and it will be treated as waste acid after several times of use. The waste acid treatment is difficult, poor in environmental protection, and high in cost. In addition, it needs to be turned frequently during the soaking process, and the corrosion time needs to be accurately controlled, otherwise the corrosion will be excessive and corrosion pits will easily appear. Phenomenon, the consistency of product quality is poor