Efficient impurity removing and crushing process of semi-molten bottom seed crystal

Abstract

The invention relates to an efficient impurity removing and crushing process of a semi-molten bottom seed crystal and belongs to the field of production and preparation of silicon materials. The efficient impurity removing and crushing process comprises the following steps: 1, material taking 2, impurity removal for the first time; 3, temperature rise pretreatment; 4, cooling pretreatment; 5, silicon material crushing; 6, impurity removal and the like. The efficient impurity removing and crushing process provided by the invention has the beneficial effects that by adopting alternate cooling and heating and applying a negative temperature value to the production process, a good impurity removal effect is realized; the process steps are simplified, drying is not needed, the occurrence of water stains is further eliminated, and the risk of the water stains does not exist; the production efficiency is good, so that the recovery rate is greatly improved.

Description

technical field [0001] The invention belongs to the field of silicon wafer production, and in particular relates to a high-efficiency impurity removal and crushing process for semi-molten bottom seed crystals. Background technique [0002] In the preparation of high-efficiency polysilicon, the high-efficiency polysilicon technology with seed crystals is mostly used, that is, the so-called semi-melting high-efficiency, and the silicon ingot grown by semi-melting high-efficiency polysilicon technology has a large number of subcutaneous pores in the semi-melting bottom seed material, and the polysilicon ingot is in the process of processing. There will be oil in the pores of the semi-molten bottom seed crystal, which is difficult to clean thoroughly, so that the semi-molten bottom seed crystal cannot be used for direct recycling and throwing into the furnace. The purity of the silicon material must be improved through an efficient polysilicon purification process. In the prior ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved is to solve the problems of complicated process steps and lengthy processes in the current process and the low recovery efficiency that easily contaminates silicon materials, and propose a high-efficiency recovery method that can efficiently crush silicon materials and effectively remove impurities , improve the recovery rate, improve the quality of recycled silicon materials, and improve the purity of recycled silicon materials