Process for producing silicon or ferrosilicon in a low-shaft ele

Details Process for producing silicon or ferrosilicon in a low-shaft ele Process for producing silicon or ferrosilicon in a low-shaft ele

1986-05-20

1989-04-11

Doll, John

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

420578, 423350, C01B 3302, C22C 3802

Patent

active

048203416

ABSTRACT:
A process for the production of silicon in a low-shaft electric furnace, in which raw-material blanks are first formed which contain fine-grain silicon dioxide, e.g. in the form of sand, and carbon in excess in respect of the reduction to silicon carbide and the raw-material blanks are introduced into the low-shaft furnance as a charge in mixture with silicon dioxide in lump form. The silicon dioxide in the raw-material moldings is reduced to silicon carbide in an upper part of the low-shaft electric furnace at a temperature of below 1600.degree. C. and coke structure agglomerates are formed from the excess carbon of the raw-material moldings. In a lower part of the low-shaft electric furnace, the silicon dioxide in lump form, is reduced to silicon with silicon carbide and carbon from the coke structure agglomerates at a temperature of above 1600.degree. C., preferably from 1800.degree. to 200.degree. C. The raw-material moldings are formed with bituminous binder containing a fine-particle silica powder. The silicon carbon reduction results in coke structure agglomerates having a very large internal carbon area in accordance with the internal area and percentage proportion of silica powder in the raw-material moldings. The silicon dioxide and gaseous silicon monoxide are reduced with the coke structure agglomerates having the increased internal area.

REFERENCES:
patent: 602976 (1898-04-01), Chalmot
patent: 1171719 (1916-02-01), Harrison
patent: 3704094 (1972-11-01), McClincy
patent: 4364974 (1982-12-01), Lask
patent: 4366137 (1982-12-01), Lask
patent: 4389493 (1983-06-01), Lask

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