Solar polycrystalline silicon purification equipment employing directional solidification metallurgical method

Abstract

The invention discloses solar polycrystalline silicon purification equipment employing the directional solidification metallurgical method. The solar polycrystalline silicon solidification equipment comprises a furnace body and a trolley, wherein a movable door is arranged on one side surface of the furnace body; the trolley can move in and out of the furnace body; a heat preservation and insulation layer is arranged on the trolley, an ingot mold is supported on trolley, and movable wheels are arranged at the lower part of the trolley; a heat preservation and insulation layer is arranged on the inner wall of the furnace body, and a heat dissipation ventilation pipe is arranged on the furnace body; a thermoelectric couple is arranged on the furnace body; a heating silicon carbide rod is arranged on the top of a hearth of the furnace body; and the thermoelectric couple and the heating silicon carbide rod are electrically connected with a control system outside the furnace body. With the adoption of the solar polycrystalline silicon purification equipment, the efficacies of low manufacturing cost, high capacity and low power consumption are realized, the metallurgical method that silicon material is directly subjected to atmospheric high-capacity directional solidification purification after the smelting procedure is finished is also realized, the yield and the purification effect of cast ingot are improved, and furthermore, the production cost is reduced, and the large-scale production is realized.

Description

technical field [0001] The invention relates to directional solidification and purification used in the process of producing solar polysilicon by metallurgical method, in particular to a kind of directional solidification metallurgical method solar polysilicon purification equipment. Background technique [0002] Utilizing the segregation effect of directional solidification to purify and remove impurities is one of the important technologies for metallurgical solar polysilicon production. Most of the existing polysilicon ingot furnaces in the market are 450kg / furnace traditional equipment (such as the GT furnace in the United States, the ALD furnace in Germany), the cost is relatively high, and there is no mature equipment and process in terms of large-capacity technology, which is applied to solar polysilicon metallurgy There are still many problems in the purification of silicon materials. In addition, the existing polysilicon ingot furnaces are oriented towards the ingo...

AI Technical Summary

Problems solved by technology

There are also cheap ingot casting equipment for purification in use in China. Although it has an advantage in terms of cost, its product quality is poor in homogeneity, low in yield, and small in capacity.

Images