Equipment for removal of metallic iron in silicon material

Abstract

The invention relates to equipment for removal of metallic iron in a silicon material; a feeding groove of a uniform feeding device of the equipment is obliquely arranged on a uniform feeding frame, the feeding groove is divided into two parts of a feeding end and a discharge end by a limiting baffle, the upper part of the discharge end of the feeding groove is provided with an electromagnet, the lower part of the feeding groove is provided with a frequency adjustment vibrator, the discharge end of the feeding groove is located at the upper part of one end of a conveying frame of a conveying device; a driven wheel and a driving wheel are located at both ends of the conveying frame and wound with a conveyer belt, an iron sucking plate support is arranged on the conveying frame on other side of the discharge end of the feeding groove, an iron sucking plate is arranged on the iron sucking plate support, an oblique blanking plate is engaged with the lower part of one end of the conveyer belt, wherein the end of the conveyer belt is at the driving wheel end, the back side of the blanking plate is provided with a permanent magnet, and a placing box is placed below the driving wheel and the blanking plate. By adopting the equipment, the feeding groove on the uniform feeding frame evenly and limitedly sends the silicon material into the conveying frame by the frequency adjustment vibrator, and by three times of magnetic sucking of iron matters on the surface and bottom of the silicon material, the effect of removing the iron matters can be effectively improved.

Description

technical field [0001] The invention relates to a device for removing metallic iron in silicon materials. Background technique [0002] At present, in the polysilicon production process, the impurity content in the polysilicon raw material directly affects the quality of the final product, especially the heavy metal impurities are very harmful to the minority carrier life of the product. Studies have shown that in the bottom and top areas of the polysilicon ingot product Contains a lot of impurities such as iron; usually, we use a magnet to adsorb the surface of the silicon material to remove impurities, and the effect of this method still needs to be improved. Contents of the invention [0003] The purpose of the present invention is to provide a device for removing metallic iron in silicon material that can perform multiple magnetic adsorption on the surface and bottom of silicon material, thereby improving the effect of impurity removal. [0004] The technical scheme a...

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Problems solved by technology

[0002] At present, in the polysilicon production process, the impurity content in the polysilicon raw material directly affects the quality of the final product, especially the heavy metal impurities are very harmful to the minority carrier life of the product. Studies have shown that in the bottom and top areas of the polysilicon ingot product Contains a lot of impurities such as iron; usually, we use a magnet to adsorb the surface of the silicon material to remove impurities, and the effect of this method still needs to be improved

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