Process of calcining limestone or hydrated lime in a rotary kiln

Details Process of calcining limestone or hydrated lime in a rotary kiln Process of calcining limestone or hydrated lime in a rotary kiln

1978-04-20

1980-09-02

Langel, Wayne A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423177, 423636, 423637, C01F 1104, C01F 1106

Patent

active

042206316

ABSTRACT:
A process for the calcining of limestone or hydrated lime by thermal treatment thereof with hot gases in an oxidizing atmosphere in a rotary kiln through which the kiln atmosphere and the charge are countercurrently passed, which kiln is fed with fuel from shell burners, is described. The invention resides in the use of different fuels which release different quantities of SO.sub.2 and SO.sub.3 per unit of calorific heat. The fuel which releases the larger quantity of SO.sub.2 or SO.sub.3 per unit value of calorific heat is supplied to the upper portion of the rotary kiln, and the fuel which releases the smaller quantity of SO.sub.2 and SO.sub.3 per unit of calorific heat is supplied to the lower portion of the rotary kiln.

REFERENCES:
patent: 2941791 (1960-06-01), Wienert
patent: 3617583 (1971-11-01), Moss et al.
patent: 3722867 (1973-03-01), Butler

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