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Device for continuously smelting and purifying solar grade silicon materials in vacuum mode

A solar-grade, silicon material technology, applied in silicon compounds, inorganic chemistry, non-metallic elements, etc., can solve problems such as high cost and unindustrialization of vacuum melting equipment

Active Publication Date: 2012-09-19
烟台宇果信息咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to technical limitations and high cost, vacuum melting equipment and technology have not yet been industrialized

Method used

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  • Device for continuously smelting and purifying solar grade silicon materials in vacuum mode
  • Device for continuously smelting and purifying solar grade silicon materials in vacuum mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Put 180Kg block or powder silicon raw material into the feeding chamber, complete the airtightness inspection of the equipment, turn on the vacuum equipment, and vacuumize the vacuum chamber. When the air pressure in the vacuum chamber is reduced to 1Pa, 20Kg of silicon material is put into the graphite crucible from the feed chamber, and the heater is turned on for smelting. Wait for the silicon material to melt, and reduce the air pressure in the vacuum chamber to below 10-2Pa. Use a temperature controller to control the output power of the heater to keep the temperature of the graphite crucible at 1600 degrees. Add silicon material at a rate of 20Kg / h. After the silicon water level in the melting zone is higher than the graphite isolation zone, the silicon water flows from the melting zone to the evaporation zone, and finally flows into the water-cooled crucible.

[0010] After all the raw materials in the feeding chamber are added to the graphite crucible and melte...

Embodiment 2

[0012] Put 250Kg block or powder silicon raw material into the feeding chamber, complete the airtightness inspection of the equipment, turn on the vacuum equipment, and vacuumize the vacuum chamber. When the air pressure in the vacuum chamber drops to 1Pa, 28Kg of silicon material is put into the graphite crucible from the feed chamber, and the heater is turned on for smelting. Wait for the silicon material to melt, and reduce the air pressure in the vacuum chamber to below 10-2Pa. Use a temperature controller to control the output power of the heater to keep the temperature of the graphite crucible at 1600 degrees. Add silicon material at a rate of 20Kg / h. After the silicon water level in the melting zone is higher than the graphite isolation zone, the silicon water flows from the melting zone to the evaporation zone, and finally flows into the water-cooled crucible.

[0013] After all the raw materials in the feeding chamber are added to the graphite crucible and melted, th...

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Abstract

The invention relates to a device for continuously smelting and purifying solar grade silicon materials in vacuum mode. A feeding chamber, a graphite crucible and a water-cooling crucible of the device are arranged in sequence, and the height of the feeding chamber, the graphite crucible and the water-cooling crucible are reduced gradually. The graphite crucible is divided into a melting zone and an evaporating zone through a graphite isolation belt, the crucible is used for heating the whole device, a graphite heater or intermediate frequency heating is used for heating, and the graphite crucible is simple in structure. Lumpy or powder-shaped silicon raw materials are added in the graphite crucible through the feeding chamber to be melted. After silicon water level is higher than the graphite isolation belt, silicon water flows in the evaporating zone from the melting zone, the silicon water flowing through the evaporating zone to flow in the water-cooling crucible, and casting is finished. The device can perform continuous smelting under the high vacuum condition to remove O, P, N, S, Al, Ca and other volatile impurities from silicon. The device is characterized by being high in vacuum and temperature and continuous in smelting and has the advantages of being low in energy consumption, free of material consumption, low in cost and easy to operate and control.

Description

technical field [0001] The invention relates to a new type of equipment and method for vacuum continuous smelting and purification of solar-grade silicon materials, and belongs to the field of related equipment and technical methods for the purification of solar-grade silicon materials. Background technique [0002] Crystalline silicon solar cells are the pillar and mainstream of the solar energy market, with a long-term market share of no less than 80%. Solar-grade silicon material refers to the silicon raw material used to prepare crystalline silicon solar cells, and is an important part of battery cost and energy consumption. At present, the production of solar-grade silicon materials mainly relies on chemical methods such as Siemens method and silane method. During the preparation process, silicon is transformed into chemical substances such as HSiCl3 and SiH4, which are generally called chemical methods. Metallurgical purification of solar-grade silicon materials is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
Inventor 吕佩文黄丰董建平颜峰岥林璋黄嘉魁黄顺乐
Owner 烟台宇果信息咨询有限公司