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Powder material charging, furnace feeding, ingot casting and purifying method

A purification method and powder technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as no powder material purification

Inactive Publication Date: 2012-08-22
JIANGSU MEIKE SILICON ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of powder material purification requires more recycled materials from the waste layer, and the purification of powder materials has not really been realized, and the purification is limited by the inventory of recycled materials from the waste layer

Method used

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Embodiment Construction

[0013] In order to make the object, technical solution and advantages of the present invention clearer, preferred embodiments of the present invention are described in detail below.

[0014] a. Press the powder material into a cylinder with a height of 85±3mm and a bottom diameter of 63±2mm, called a powder stick.

[0015] b. Lay a complete silicon wafer on the bottom of the crucible, with a thickness of 2-3 pieces, and place a complete silicon wafer vertically on each side of the crucible side wall, with a thickness of 2-3 pieces.

[0016] c. Lay 10-15kg of powder material on the silicon wafer to make the surface smooth.

[0017] d. Place 169 powder sticks vertically according to 13*13 on the powder material.

[0018] e. Spread 10-15kg of powder material on the powder stick to make the surface smooth.

[0019] f. Place complete silicon wafers vertically on the side wall of the crucible, with a thickness of 2-3 wafers.

[0020] g. Place 169 powder sticks vertically accordin...

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Abstract

The invention provides a powder material charging, furnace feeding, ingot casting and purifying method comprising the following steps of: pressing the powder material into cylindrical powder rods; laying the powder rods at the bottom and on the side wall of a crucible by using silicon slices; arranging the powder rods and the powder material layer by layer, wherein the powder rods are arranged vertically; removing silicon material as well as dust on the crucible; and feeding the silicon material into a furnace, omitting an equipment reverse-inflation procedure, and carrying out ingot casting operation after slowly vacuumizing. The method has the following benefits that a depleted layer reclaimed material does not need to be used and a large quantity of powder materials can be used for charging, ingot casting and purifying; and the restriction from the stock of the depleted layer reclaimed material can be avoided when the method is used for purifying the powder material.

Description

technical field [0001] The invention relates to the technical field of polysilicon ingot casting, in particular to a method for purifying a silicon material whose powder exceeds 90%. Background technique [0002] Powder material is an auxiliary product of silicon raw material produced by fluidized bed method. When it is used for ingot purification, it is easy to be vacuumed out or blown out by backfilling. Therefore, a large amount of waste layer recycled material is usually used to cover the powder material when ingot casting Above, the current ingot purification powder dosage generally does not exceed 50%. Therefore, the use of powder materials for purification requires more recycled materials from the waste layer, and the purification of powder materials has not really been realized, and the purification is limited by the inventory of recycled materials in the waste layer. Contents of the invention [0003] The object of the present invention is to provide a method tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/037
Inventor 吴庆王禄宝徐勇袁志钟
Owner JIANGSU MEIKE SILICON ENERGY
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