Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1985-03-11
1988-05-31
Sneed, Helen M. S.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
423175, 423177, 423438, 423637, 423415R, C01F 1106
Patent
active
047480106
ABSTRACT:
Energy conserving limestone calcining system, including a process and apparatus in which in a first step or kiln zone limestone is heated, e.g., at 1700.degree.-2100.degree. F., sufficiently to achieve more than only about 50 or 60%, e.g., 75%, partial conversion thereof to calcium oxide and carbon dioxide and to form a partially calcined hot mass containing sufficient retained heat for substantially completing the conversion of the remaining unconverted limestone therein, and thereafter in a second step or separate vacuum chamber zone substantially completing the conversion of the limestone in the hot mass to calcium oxide and carbon dioxide by such retained heat while subjecting the partially calcined hot mass to a vacuum sufficiently to remove substantially completely the resultant carbon dioxide and for a duration sufficient to achieve such substantially complete conversion of the limestone and thereby provide a substantially completely calcined hot mass, the apparatus including a closable calcining vacuum chamber separate from and adjacent the discharge outlet of a lime kiln and arranged for receiving therefrom the partially calcined hot mass for completing the conversion of the limestone to calcium oxide and carbon dioxide and for applying a vacuum thereto for removing the carbon dioxide, and a heat retaining hood operatively enclosing the kiln discharge outlet and the vacuum chamber for minimizing heat loss from the hot mass in the vicinity of such discharge outlet and in the vacuum chamber.
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Chemstar, Inc.
McFarlane Anthony
Sneed Helen M. S.
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