Method for removing boron from silicon

Details Method for removing boron from silicon Method for removing boron from silicon

2005-03-02

2011-10-11

Mayes, Melvin C (Department: 1732)

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

Reexamination Certificate

active

08034151

ABSTRACT:
The present invention provides a method for removal of boron from metal silicon inexpensively and extremely efficiently by a simple method, specifically, heating metal silicon containing boron as an impurity to its melting point to 2200° C. to place it in a molten state, then adding a solid mainly comprised of silicon dioxide and a solid mainly comprised of one or both of a carbonate of an alkali metal or a hydrate of a carbonate of an alkali metal into said molten silicon so as to form a slag and remove the boron in the silicon.

REFERENCES:
patent: 5788945 (1998-08-01), Schei
patent: 6368403 (2002-04-01), Schmid et al.
patent: 2005/0139148 (2005-06-01), Fujiwara et al.
patent: 1143605 (1997-02-01), None
patent: 2 116 956 (1983-10-01), None
patent: 55-67519 (1980-05-01), None
patent: 56-32319 (1981-04-01), None
patent: 58-130114 (1983-08-01), None
patent: 4-130009 (1992-05-01), None
patent: 4-193706 (1992-07-01), None
patent: 4-228414 (1992-08-01), None
patent: 5-246706 (1993-09-01), None
patent: 9-202611 (1997-08-01), None
patent: 09202611 (1997-08-01), None
patent: 2003-12317 (2003-01-01), None
patent: 2003012317 (2003-01-01), None
patent: WO 89/02415 (1989-03-01), None
patent: WO8924150 (1989-03-01), None
patent: WO 03/066523 (2003-08-01), None
Hurley, john et al, the effects of atmosphere and additives on coal slag viscosity, Mar. 1996, 691-694.
Mitsuru Tanahashi et al., Distribution Behavior of Boron Between Sio2-saturated NaO0.5-CaO-Sio2Flux and Molten Silicon, Journal of the Mining and Materials, Processing Institute of Japan, vol. 118, No. 7, pp. 497-505, 2002.
Chinese Office Action dated May 30, 2008 issued in corresponding Chinese Application No. 2005800064695.
European Search Report dated Jan. 20, 2010 issued in corresponding European Application No. 05 72 0288.

Affiliated with

Also associated with

Rating

Method for removing boron from silicon does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for removing boron from silicon, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for removing boron from silicon will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4255417