Method for producing solar cell-grade silicon from rice hulls

Details Method for producing solar cell-grade silicon from rice hulls Method for producing solar cell-grade silicon from rice hulls

1979-03-23

1980-07-29

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

106288B, 136 89SG, 148174, 252188, 252421, 252427, 423335, 423345, 423350, H01L 2104, C04B 3100

Patent

active

042149207

ABSTRACT:
The present invention relates to the production of high purity solar grade silicon from common rice hulls. A unique process for material purification and reduction includes leaching the rice hulls in acid followed by treatment with high purity water, coking the acid-cleaned hulls in a non-oxidizing ambient, compensating the carbon or silica content of the coked hulls to obtain a desired carbon to silica ratio and reducing the silica to produce high purity silicon.

REFERENCES:
patent: 1556039 (1925-10-01), Shilstone
patent: 2018133 (1935-10-01), Kirchner
patent: 2115973 (1938-05-01), Fleming
patent: 3125043 (1964-03-01), Gravel
patent: 3451944 (1969-06-01), Finch
patent: 3704094 (1972-11-01), McClincy et al.
patent: 3754076 (1973-08-01), Cutler
patent: 3887359 (1975-06-01), Enger et al.
patent: 4049464 (1977-09-01), Tutsek et al.
Basu et al., "Manufacture of Silicon Tetrachloride from Rice Hulls", American Institute of Chemical Engineering Journal, vol. 19, No. 3, May 1973, pp. 439-445.

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