Process of calcining limestone in a rotary kiln

Details Process of calcining limestone in a rotary kiln Process of calcining limestone in a rotary kiln

1978-04-20

1981-03-31

Bernstein, Hiram

Chemistry: physical processes

Physical processes

34134, 432 13, 432 14, 432105, 422307, 423177, F27B 736

Patent

active

042590817

ABSTRACT:
A process for the calcining of limestone or hydrated lime by thermal treatment thereof with hot gases in a rotary kiln through which the kiln atmosphere and the charge are countercurrently passed, which kiln is fed with solid carbonaceous fuel, is described. The invention resides in introducing an oxygen-containing gas into a horizontal region across the rotary kiln defined by a point along the length of the kiln where ignitable particles of said solid fuel first appear and a second point along the length of said rotary kiln which is spaced from the charging end of said kiln not more than 50% of the length thereof. The oxygen-containing gases are injected through nozzle blocks in said rotary kiln, and oxygen-containing gas is introduced into the free space of said kiln.

REFERENCES:
patent: 2194164 (1940-03-01), Daniels
patent: 3206299 (1965-09-01), Senior et al.
patent: 3887326 (1975-06-01), Townley
patent: 4022569 (1977-05-01), Farago et al.
Perry--Chemical Engineers' Handbook 4th Ed., McGraw Hill, N.Y., 1963, pp. 20-37.

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