Method of refining silicon with non-graphite crucible on medium-frequency furnace

An intermediate frequency furnace, non-graphite technology, applied in chemical instruments and methods, silicon compounds, non-metallic elements, etc., can solve the problems of high-purity silicon metal pollution, inapplicability, etc., to reduce smelting costs, improve production efficiency, block The effect of pollution

Inactive Publication Date: 2015-08-05
JACO SOLAR SILICON LONGYAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is only suitable for use in submerged arc furnaces, and is not suitable for refining that generally uses solid metallic silicon as raw material
There are no relevant reports on other methods of purifying silicon us

Method used

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  • Method of refining silicon with non-graphite crucible on medium-frequency furnace

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Embodiment Construction

[0030] Such as figure 1 As shown, the non-graphite crucible of the present invention includes an infrared thermometer 1, an intermediate frequency furnace shell 2, a coil red mud 3, a water-cooled coil 4, a cast molding crucible (prefabricated crucible) 5, a silicon slag protective layer 6, and a silicon melt 7. Refractory cement8. Coil red mud 3 is applied to the inside of the water-cooled coil 4, and the coil red mud 3 is baked and sintered. After the sintering of the coil red mud 3 is completed, a crucible mold is built in the intermediate frequency furnace, and the castable is used to cast the crucible 5, or the prefabricated crucible 5 is placed in the intermediate frequency furnace, and the surrounding is filled with dry vibration material. During smelting, a silicon slag protective layer 6 is formed in the crucible 5 , and refractory cement 8 is filled between the bottom of the crucible 5 and the shell 2 of the intermediate frequency furnace. Inside the crucible 5 is ...

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Abstract

The invention discloses a method of refining silicon with a non-graphite crucible on a medium-frequency furnace, wherein the method includes following steps: (1) employing a high-temperature-resistant non-graphite crucible; (2) heating the high-temperature-resistant non-graphite crucible with a graphite electrode to melt metallic silicon; (3) controlling the parameter of the medium-frequency furnace and the temperature of molten silicon to form a silicon slag protective layer on an inner wall of the crucible to protect the crucible from being eroded and polluting the molten silicon; (4) adding a slag forming agent to perform slagging refining; (5) removing floated slag and pouring out a part of molten silicon while a little of molten silicon is remained in the crucible to perform next silicon melting and slagging refining. The method is carried out with the non-graphite crucible which is long in service life and is free of problem of oxidization. The silicon slag formed on the inner wall of the crucible can protect the crucible from being eroded by a slag forming agent and meanwhile high-purity molten silicon can be insulated from the wall of the crucible to stop pollution of the cruicble to the high-purity molten silicon. Continuous production in the medium-frequency furnace is ensured since enough molten silicon is remained in the crucible of each batch.

Description

technical field [0001] The invention belongs to the technical field of polysilicon purification by metallurgy, and in particular relates to a method for refining silicon in an intermediate frequency furnace using a non-graphite crucible. Background technique [0002] Energy and ecological environment issues have always been two new global issues of concern to the world. Solar energy is considered to be the most important new energy source in the 21st century due to its advantages such as wide distribution, cleanness, and no pollution. [0003] At present, the methods for purifying solar polysilicon mainly include Siemens method, new silane method, fluidized bed method, metallurgical method, etc. Among them, metallurgical method has the characteristics of high output, low investment, low cost and no pollution. Mainly include: blowing refining method, electron beam smelting, plasma smelting method, directional solidification, slagging method, vacuum smelting method, high temp...

Claims

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Application Information

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IPC IPC(8): C01B33/037
Inventor 胡建峰罗晓斌孙坤泽杨继荣
Owner JACO SOLAR SILICON LONGYAN CO LTD
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