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Intermediate-frequency induction furnace for solar energy polysilicon purification by metallurgy method and polysilicon purification method

An induction furnace and metallurgical technology, which is applied in the field of intermediate frequency induction furnace for metallurgical solar polysilicon purification and polysilicon purification, can solve the problems of high cost and difficult output of polysilicon, and achieve the effect of low cost, large output and high efficiency

Inactive Publication Date: 2014-05-14
北京民海艳科技有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high cost and difficult scale production of polysilicon by the existing metallurgical method, and further provide a medium frequency induction furnace and polysilicon purification method for metallurgical solar polysilicon purification

Method used

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  • Intermediate-frequency induction furnace for solar energy polysilicon purification by metallurgy method and polysilicon purification method
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  • Intermediate-frequency induction furnace for solar energy polysilicon purification by metallurgy method and polysilicon purification method

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation is provided, but the protection scope of the present invention is not limited to the following embodiments.

[0018] Such as Figure 1 ~ Figure 3 As shown, an intermediate frequency induction furnace for metallurgical solar polysilicon purification related to this embodiment includes: a furnace body 1, an upper cover 2 and an air blowing (working gas) device 6, and the furnace body 1 includes a magnesia layer 3 , a high-alumina castable layer 10, a graphite brick layer 4 and a zirconia layer 5, the graphite brick layer 4 and the zirconia layer 5 are both inner layers, the zirconia layer 5 is on the top of the graphite brick layer 4, and the magnesia layer 3 It is the outer layer, and the high-alumina castable layer 10 is arranged ...

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Abstract

The invention provides an intermediate-frequency induction furnace for solar energy polysilicon purification by metallurgy method and a polysilicon purification method. The intermediate-frequency induction furnace is characterized in that: the central part of the intermediate-frequency induction furnace is cylindrical, the furnace body at the two sides of the cylinder is respectively provided with a short furnace mouth and a long furnace mouth, and the furnace body at the lower portion of the long furnace mouth is provided with an air blowing unit. The method comprises the following steps: firstly preparing two intermediate-frequency induction furnaces with different volumes, wherein the front No.1 intermediate-frequency induction furnace has a volume of 1-12 t, and the volume of the rear No.2 intermediate-frequency induction furnace is 1 / 4-1 / 2 of that of the No.1 intermediate-frequency induction furnace; setting the purification refining time in the No.1 intermediate-frequency induction furnace and the No.2 intermediate-frequency induction furnace both to 3-4 h, after completing the refining in the No.1 intermediate-frequency induction furnace, slowing pouring into the No.2 intermediate-frequency induction furnace, simultaneously slowly adding a new silicon liquid obtained from an industrial silicon furnace into the No.1 intermediate-frequency induction furnace, and pouring the silicon liquid in the No.2 intermediate-frequency induction furnace into a directional coagulator. According to the invention, the three units continuously work and refine, thus the continuous production and scale expansion of the capacity are realized.

Description

technical field [0001] The invention relates to an intermediate frequency induction furnace for polysilicon purification and a polysilicon purification method using the induction furnace. Background technique [0002] At present, the production methods of polysilicon mainly include chemical method and metallurgical method. The chemical method is the current mainstream technology, but its process is complicated, the construction investment is large, the operation cost is high, and it has certain pollution to the environment. Countries all over the world are studying new polysilicon production processes, among which metallurgy is the most representative and promising polysilicon production process. Compared with the chemical method, the process flow of the metallurgical method is relatively simple, the construction investment is low, the cost is low, and it is environmentally friendly and pollution-free. However, the metallurgical method currently has some disadvantages such ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/037
Inventor 张振海杨大伟
Owner 北京民海艳科技有限公司
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