METHOD AND APPARATUS FOR PRODUCING SILICON

Title:

METHOD AND APPARATUS FOR PRODUCING SILICON

Document Type and Number:

WIPO Patent Application WO/2011/055650

Kind Code:

A1

Abstract:

Disclosed are a method and an apparatus for producing silicon by carbon reduction in an electric arc furnace using a carbon material and a silica material that contains iron, aluminum, calcium and titanium respectively in an amount of 0.1% by mass or less. The method and the apparatus for producing silicon are characterized in that the overcurrent flowing through an electrode of the electric arc furnace during the carbon reduction is reduced using a power regulator or the electric arc furnace is operated while setting the hearth power density (PD) of the electric arc furnace at 90 (W/cm2) or higher.

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Inventors:

YAMAHARA KEIJI
FUJIMOTO HIROMI
KATAYAMA TOSHIAKI

Application Number:

PCT/JP2010/068877

Publication Date:

May 12, 2011

Filing Date:

October 25, 2010

Export Citation:

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Assignee:

MITSUBISHI CHEM CORP (JP)
YAMAHARA KEIJI
FUJIMOTO HIROMI
KATAYAMA TOSHIAKI

International Classes:

C01B33/025; F27B3/08; F27B3/28; F27D11/08; H05B7/148

Domestic Patent References:

WO2009130786A1

2009-10-29

Foreign References:

JPH04177085A	1992-06-24
JPH05158563A	1993-06-25
JPH04231315A	1992-08-20
JP2009530218A	2009-08-27
JPS57111223A	1982-07-10
JPS60200818A	1985-10-11
JPS61117110A	1986-06-04
JPS62260711A	1987-11-13
JP2009255254A	2009-11-05

Other References:

KATO ET AL., MATERIA, vol. 41, no. 1, 2002, pages 54 - 56
AULICH, H, PROCEEDINGS OF THE FLAT-PLATE SOLAR ARRAY PROJECT WORKSH ON CRYSTAL GROWTH FOR HIGH-EFFICIENCY SILICON SOLAR CELLS, vol. 86-11, 1985, pages 267 - 278

Attorney, Agent or Firm:

HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)

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