Removal Method of Nitric Oxide Flue Gas Generated by Acid Pickling of Stainless Steel by Sulfamic Acid and Sulfuric Acid

摘要

The present invention relates to a method for efficiently removing nitric oxide flue gas generated in a stainless steel mixed acid pickling process using sulfamic acid and sulfuric acid, wherein the acid pickling solution is added by adding less than 1% by weight of sulfamic acid and sulfuric acid additives. The tank provides a method of removing NOx flue-gases by delaying NOx production until hydrogen peroxide initiates the reaction and then continuously adding hydrogen peroxide to the mixed acid circulation tank.;In the present invention, after delaying the initial NOx formation reaction using sulfamic acid and sulfuric acid, the efficiency of the sulfamic acid and sulfuric acid additives is reduced, and the generated NOx may be removed and recovered as nitric acid at maximum efficiency by reacting with hydrogen peroxide.