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2 144 498

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IPC

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Application

99102010/12, 1999-02-01

(24)

Start date

1999-02-01

(22)

Actual filing date

1999-02-01

(45)

Published

2000-01-20

(72)

Inventor

Zemnukhova L.A.Vinogradov V.V.Bylkov A.A.Vinogradov D.V.

(73)

Holder

Zemnukhova Ljudmila AlekseevnaVinogradov Viktor VladimirovichBylkov Aleksandr AleksandrovichVinogradov Dmitrij Viktorovich

METHOD OF PREPARING HIGHLY PURE AMORPHOUS SILICON DIOXIDE AND CARBON FROM RICE HUSK Russian patent published in 2000 - IPC

Abstract RU 2144498 C1

FIELD: chemical industry. SUBSTANCE: method comprises subjecting rice husk to acid etching, washing with water, drying, precombusting in closed reactor where smoke is sucked out and amorphous carbon is entrapped, grinding and oxidative combustion successively in current of air and oxygen. Precombustion is carried out simultaneously with grinding and stirring operations. Suction of smoke is carried out through labyrinth filter being cooled and water, and/or zeolite or other absorbent. Oxidative combustion is carried out first in current of oxygen till visible combustion process ceases, and then in current of oxygen for 20-60 minutes under constant stirring. Method makes it possible to prepare amorphous silicon dioxide with purity of 99-99.99% and black with purity of 98%. EFFECT: ecological purity of process and rational use of rice husk. 4 cl, 1 tbl

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RU 2 144 498 C1

Authors

Zemnukhova L.A.

Vinogradov V.V.

Bylkov A.A.

Vinogradov D.V.

Dates

2000-01-20—Published

1999-02-01—Filed