Control of carbon balance in a silicon smelting furnace by monit

Details Control of carbon balance in a silicon smelting furnace by monit Control of carbon balance in a silicon smelting furnace by monit

1993-05-07

1994-12-27

Langel, Wayne

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423350, C01B 3302, H05F 300

Patent

active

053762479

ABSTRACT:
The present invention is a method for controlling the carbon balance of a silicon smelting furnace. The inventors lave discovered that when the concentration of calcium within the silicon formed in the furnace is maintained within a range of about 0.4 to 2.0 weight percent, the calcium yield of the furnace is a rapid and sensitive indicator of the carbon balance of the furnace. More specifically, the inventors have found that a calcium yield of less than about 80 weight percent indicates a negative carbon balance in the furnace, a calcium yield of greater than about 90 weight percent indicates an excess carbon balance in the furnace, and a calcium yield within a range of about 80 weight percent to 90 weight percent indicates a furnace in carbon balance. In a preferred embodiment of the present invention, calcium yield is used in conjunction with a harmonic volts parameter and a electrode consumption measurement to control carbon balance of the furnace.

REFERENCES:
patent: 3909242 (1975-09-01), Skreien
patent: 4539194 (1985-09-01), Halvorsen
patent: 4798659 (1989-01-01), Dosaj et al.
patent: 4898960 (1990-02-01), Dosaj et al.
patent: 5174982 (1992-12-01), Dosaj et al.

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