Production method and production equipment for high-purity polysilicon

A production method and technology for polycrystalline silicon, which are applied in the directions of polycrystalline material growth, crystal growth, and single crystal growth, etc., can solve problems such as being unsuitable for large-scale industrial production, difficult to layer oxides and silicon, and difficult to obtain high-purity polycrystalline silicon. , to achieve the effect of deep oxidation and impurity removal, compact structure and clear structure layout

Active Publication Date: 2012-10-24
沈阳三特真空科技有限公司
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Problems solved by technology

However, it is obvious that this method is difficult to obtain high-purity polysilicon that meets the needs of solar cells.
First of all, in the process of smelting and directional solidification, there is basically no function of removing impurities in silicon. Although the process of directional solidification can make metal impurities in silicon accumulate towards one end of the oriented billet, the patented method of the invention does not have the subsequent removal of accumulated impurities. In addition, in the secondary oxidation refining process, after injecting oxidizing gas, the impurities and silicon in the silicon liquid can be oxidized under normal circumstances to form oxides, and the melting point of oxides is higher than that of silicon. , and often the specific gravity of oxides in the silicon system is very close to or greater than that of silicon. The layering of oxides and silicon is difficult, which is not conducive to the removal of oxides. Therefore, special treatment of oxides is required to maintain the stability of the smelting process. for the purpose of refining
Obviously, this method does not actually have the conditions for purifying silicon, and it is not suitable for large-scale industrial production

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  • Production method and production equipment for high-purity polysilicon

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Embodiment 1

[0046] see figure 1 , which shows a preferred embodiment of the production method of the present invention. Firstly, the carbon-reduced metal silicon is used as the raw material, and the metal silicon is graded and crushed in a crusher, and then further crushed by a jet mill to make 150-400 mesh silicon powder. Then use the acid-dissolving method to remove oxides and some metal inclusions in the silicon, and then wash with deionized water and then dry. Weigh 25 tons of silicon powder according to the capacity of the 25-ton smelting furnace, put it in the feeding hopper, and prepare to add it to the smelting bag. The 25-ton smelting ladle is preheated before loading silicon materials. The preheating method is heated by burning heavy oil. The preheating temperature of the smelting ladle reaches 1500-1520°C. The preheating of the smelting ladle is carried out on the special preheating workbench of the production line. After preheating, the silicon material is added into the smel...

Embodiment 2

[0055] see also figure 1 , with carbon-reduced metal silicon as raw material, the metal silicon is graded and crushed in a crusher, and then further crushed by a jet mill to make 150-250 mesh silicon powder. Then the oxides and some metal inclusions in the silicon were removed by acid-dissolving method, and then washed with deionized water and then dried. Weighed 15 tons of silicon powder according to the capacity of a 15-ton smelting furnace, placed it in the feeding hopper, and prepared to add it to the smelting bag. The 15-ton smelting ladle is preheated before loading silicon materials. The preheating method is heated by burning heavy oil, and the preheating temperature of the smelting ladle reaches 1500°C. The preheating of the smelting ladle is carried out on the special preheating workbench of the production line. After preheating, the silicon material is added into the smelting ladle through the feeding hopper.

[0056] The smelting ladle containing the silicon materi...

Embodiment 3

[0065] see figure 1 , with carbon-reduced metal silicon as raw material, the metal silicon is graded and crushed in a crusher, and then further crushed with a jet mill to make 150-250 mesh silicon powder. Then the oxides and some metal inclusions in the silicon were removed by acid-dissolving method, and then washed with deionized water and then dried. Weighed 5 tons of silicon powder and put it into a 5-ton industrial frequency melting furnace.

[0066] Start power frequency induction heating, and assist in coal blowing oxygen combustion heating (fuel is liquefied petroleum gas, etc.), oxygen blowing combustion heating. Put the burning coal-oxygen gun on the surface of the silicon material, and the heat generated by the coal-oxygen combustion will melt the silicon. When the molten silicon forms a molten pool, turn off the gas and blow oxygen directly, so that the silicon at high temperature will be burned and released in the oxygen. Heat, continue to heat the silicon materia...

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Abstract

The invention relates to a production method for high-purity polysilicon and production equipment for producing the high-purity polysilicon by the production method, wherein the production method comprises the following steps: preparing a silicone material, smelting a packaging material, deslagging, smelting silicon refining, casting silicone fluid slag, deairing silicone fluid in vacuum, directionally solidifying, discharging silicon ingots, and peeling and cutting, wherein the silicone material used in the silicone material preparation step is metallurgy level of reduction silicon; and a heating mode adopted in the silicon material smelting step comprises chemical combustion heating. The production equipment comprises at least more than three same ladle structures used for a smelting ladle and a refining ladle, wherein one ladle is used for smelting operation, one ladle is used for refining operation, and another ladle is used for repairing, preheating or loading operation. The production method and the production equipment can produce the high-purity polysilicon on large scale and at low cost.

Description

technical field [0001] The invention relates to a production method of high-purity polysilicon and production equipment for producing high-purity polysilicon by using the production method. Background technique [0002] Fossil energy is non-renewable energy, and due to the increase of the earth's greenhouse effect due to the large amount of carbon dioxide produced in the use of fossil energy, the continuous reduction and use of fossil energy has caused increasing pressure on the living environment of human beings. As a green energy source, solar energy has attracted people's attention. Solar photovoltaic power generation was first invented as a satellite power supply technology. The key technical material for photovoltaic conversion is metal silicon. With breakthroughs in photovoltaic conversion materials and technologies, solar photovoltaic conversion technology has been used for civilian use, and the demand for high-purity metal silicon is also increasing. At the same tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/037C30B29/06
Inventor 张洪平王冬
Owner 沈阳三特真空科技有限公司
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