PRODUCTION METHOD OF CATALYST FOR REDUCTION REMOVING OF NITROGEN OXIDE IN EXHAUST GAS BY AMMONIA, METHOD FOR REDUCTION REMOVING OF NITROGEN OXIDE IN EXHAUST GAS AND CLEANING METHOD OF SINTERING EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To provide a production method of an inexpensive and highly efficient catalyst for removing of NOxby reduction in an exhaust gas, to provide a method for reduction removing of NOxin the exhaust gas, and to provide a cleaning method of a sintering exhaust gas.

SOLUTION: (1) After a steel pickling waste liquid containing a ferrous ion is neutralized with an alkaline agent, the ferrous ion in the waste liquid is oxidized to form a precipitate containing Fe(OH)3, or (2) after the ferrous ion in the waste liquid is oxidized and thereafter is neutralized with the alkaline agent to form the precipitate containing Fe(OH)3, and then the precipitate is dehydrated and thereafter is molded to produce the catalyst. In addition, the produced catalyst is brought into contact with the exhaust gas added with NH3to remove NOxby reduction in the exhaust gas.

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