Device and method for comminuting coarsely crushed polycrystalline silicon

A polysilicon, rough technology, applied in the field of polysilicon devices, can solve the problems of high cost, time-consuming replacement or replacement, etc., and achieve the effect of reduced pollution and good repeatable product types

Active Publication Date: 2013-01-02
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, roll maintenance is an additional cost factor
Considering the technical construction of hard metal rollers, the exchange or replacement of the rollers is very time-consuming and costly

Method used

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  • Device and method for comminuting coarsely crushed polycrystalline silicon
  • Device and method for comminuting coarsely crushed polycrystalline silicon
  • Device and method for comminuting coarsely crushed polycrystalline silicon

Examples

Experimental program
Comparison scheme
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Embodiment

[0035] Example: Comparison of the crushing method using a conventional crusher and the crushing method using a crusher according to the present invention.

[0036] a) Conventional method: Silicon rods of about 180 mm diameter are pre-broken in a first manual breaking step to form pieces of about 200 mm in size. These fragments were then manually crushed in a second crushing step to a maximum edge length of 110 mm. This raw material was then comminuted in 4 operations by means of a crusher with 450 mm diameter rollers and with different nip widths to edge lengths from 8 mm to 15 mm. Therefore, in order to produce a specific product, 2 manual operation steps and also 4 mechanical operation steps are necessary.

[0037] b) Method according to the invention: Silicon rods with a diameter of about 180 mm are pre-broken in a first manual crushing step to form fragments with a size of about 200 mm. These fragments with a maximum edge length of 200 mm are supplied as raw material dir...

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Abstract

The roll crusher comprises a roller, which rotates a shaft (3), where the roller consists of a bearing roller (2) of steel and of multiple hard metal segments (1). The hard metal segments consist of a cobalt matrix, and are stored in tungsten carbide. The hard metal segments are positive-fit reversibly on the bearing roller. An independent claim is also included for a method for milling lumpy polysilicon involves milling of lumpy polysilicon by roll crusher.

Description

technical field [0001] The present invention relates to a device and a method for comminuting coarsely broken polysilicon so that said polysilicon is of such a purity that it can be used directly, ie without subsequent cleaning, in photovoltaic applications. Background technique [0002] Polycrystalline silicon (polysilicon) is generally produced by vapor deposition in Siemens reactors. This involves the precipitation of high-purity silanes or chlorosilanes on a hot substrate, preferably silicon, in order to obtain solid rods, ingots or slabs. Before this polysilicon can be used in the crystallization process, it must be pulverized. This generally makes it contaminated with abrasive substances, so that the contamination on the surface has to be removed by cleaning methods. [0003] Polysilicon that can be applied directly in the crystallization process (i.e. without subsequent cleaning) and suitable for solar applications, i.e. very pure (generally <10 ppba total metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C4/30
CPCC01B33/02B28D1/18B02C4/305B02C4/30B02C4/02C22C27/04C22C19/07
Inventor P·格吕布尔R·赫尔茨维默尔
Owner WACKER CHEM GMBH
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