Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1997-01-07
1998-08-11
Langel, Wayne
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
423640, C01F 1118
Patent
active
057924406
ABSTRACT:
Flue gases exhausted from a lime kiln containing lime kiln dust are treated to produce a high purity calcium carbonate precipitate. This is accomplished by passing the flue gases from the lime kiln through a kiln dust separator so that lime kiln dust containing calcium oxide is removed from the remaining flue gas. The lime kiln dust is mixed with water so that an aqueous suspension of the lime kiln dust is formed. Quicklime or calcium oxide in the lime kiln dust is thus hydrated to form calcium hydroxide. The solids within the suspension are then allowed to settle so that a clear, saturated solution of calcium hydroxide having a pH of about 12.4 is formed. This solution is then contacted with carbon dioxide gas so that the calcium hydroxide reacts to form a high purity calcium carbonate precipitate. This high purity calcium carbonate precipitate is then allowed to settle from supernatant water of the solution. The high purity calcium carbonate is separated from the supernatant water, while the supernatant water is used as the water mixed with the lime kiln dust to form the aqueous suspension.
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Robert S. Boynton, Chemistry and Technology of Lime and Limestone, Interscience Publishers, (1966), pp. 267, 268.
Chemical Lime Company
Gunter Jr. Charles D.
Langel Wayne
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