Method for removing ammonia from ammonia contaminated fly ash

Details Method for removing ammonia from ammonia contaminated fly ash Method for removing ammonia from ammonia contaminated fly ash

1999-02-24

2000-06-20

Griffin, Steven P.

Chemistry of inorganic compounds

Nitrogen or compound thereof

Ammonia or ammonium hydroxide

423237, 423238, 423352, 423356, C01C 300, C01F 1500, C01G 4300, C01G 4308

Patent

active

060774940

ABSTRACT:
A method for removing ammonia from coal fly ash contaminated by ammonium salts is disclosed. The method involves the addition of small amounts of water, and in some cases, small amounts of an alkali source, to the fly ash to liberate the ammonia trapped therein. The ammonia liberation may be further aided by vigorous mixing of the fly ash.

REFERENCES:
patent: 5069720 (1991-12-01), Epperly et al.
patent: 5211926 (1993-05-01), Martin et al.
Van der Brugghen, F.W., Gast, C.H., Van den Berg, J.W., Kuiper, W.H., Visser, R., Problems Encountered During the Use of Ammonium-Contaminated Fly Ash, Proceedings: EPRI/EPA 1995 Joint Symposium on Stationary Combustion No.sub.x Control, May 16-19, 1995, Book 4, Session 8A.
Fisher, B. C., Blackstock, T., and Hauke, D., Fly Ash Beneficiation Using an Ammonia Stripping Process, Proceedings: 12th Int. Symposium on Coal Combustion By-Products Management and Use, Jan. 1997, Paper #65.
Larrimore, Lamar, Dodgen, Dean, and Monroe, Larry, Characterization of Ammonia Effects on Ash and Evaluation of Removal Methods, Proceedings: 13th International Symposium on Use and Management of Combustion Products, Jan. 1999, Paper #16.
Van den Berg, J.W., and Cornelissen, H.A.W., Effect of low Nox technologies on Fly Ash Quality, Proceedings: 13th Int. Symposium on Coal Combustion By-Products Management and Use, Jan. 1999, Paper #29.

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