Method for manufacturing polycrystalline silicon fragment and polycrystalline silicon block fracture device

Patent metadata

Field	Value
Publication number	US-11590509-B2
Application number	US-201916385816-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Oct 14, 2014
Publication date	Feb 28, 2023
Grant date	Feb 28, 2023

Abstract

A polycrystalline silicon block fracture device includes a fracturing part mechanically fracturing a polycrystalline silicon block material to produce a polycrystalline silicon fragment including a polycrystalline silicon powder having a particle size of 500 to 1000 μm then discharging from a discharging port; a falling movement part continuous with a downstream of the fracturing part allowing said polycrystalline silicon fragment discharged from the discharging port to fall by gravity; a receiver part positioned at downstream of the falling movement part and receives the polycrystalline silicon fragment after falling through the falling movement part; and the falling movement part includes a suction removing part in which at least part of the polycrystalline silicon powder included in the polycrystalline silicon fragment is removed by suctioning to a different direction from falling direction; the suction removing part suctions at a suction rate of 1 to 20 m3/min.

First claim

The invention claimed is:

1. A polycrystalline silicon block fracture device, comprising:
a fracturing part mechanically fracturing a polycrystalline silicon block material introduced from a material introduction port by a movement of an outside force loading member to produce a polycrystalline silicon fragment including a polycrystalline silicon powder having a particle size of 500 to 1000 μm then discharging from a discharging port,
a falling movement part continuous with a downstream of said fracturing part allowing said polycrystalline silicon fragment discharged from the discharging port to fall by gravity,
a receiver part positioned at downstream of said falling movement part and receives said polycrystalline silicon fragment after falling through said falling movement part,
a sliding dust suction part suctioning a sliding dust generated by a sliding part which slides together with the movement of said outside force loading member; and
said falling movement part comprises a suction removing part in which at least part of said polycrystalline silicon powder included in said polycrystalline silicon fragment is removed by suctioning to a different direction from said falling direction,
wherein an amount of said polycrystalline silicon fragment is supplied to said falling movement part at 20 to 160 g/min per unit area, cm 2 , of said falling movement part, and said suction removing part suctions at a suction rate of 1 to 20 m 3 /min.

2. The polycrystalline silicon block fracture device as set forth in claim 1 , wherein said outside force loading member comprises a movable teeth, and a stationary teeth,
said fracturing part fractures said polycrystalline silicon block material introduced from said material introduction port at an upstream by placing between said movable teeth and said stationary teeth, and discharges from said discharging port at the downstream.

3. A production method of a polycrystalline silicon fragment, comprising:
providing the polycrystalline block fracture device as set forth in claim 1 ; and
blowing air to said polycrystalline silicon fragment received by said receiver part.

Assignees

• Tokuyama Corp

Inventors

• Kawaguchi Kazuhiro
• Fujii Masami
• Uchida Sho
• Kondo Manabu
• Mito Yoshifumi
• Yoshimatsu Nobuaki

Classifications

• B02C1/02

  Jaw crushers or pulverisers · CPC title

• C01P2006/80

  Compositional purity · CPC title

• B02C23/10

  with separator arranged in discharge path of crushing or disintegrating zone · CPC title

• B02C23/30

  the applied gas acting to effect material separation (B02C23/34 takes precedence) · CPC title

• C01B33/02 Primary

  Silicon (forming single crystals or homogeneous polycrystalline material with defined structure C30B) · CPC title