A REMOVAL METHOD OF H2S GENERATED DURING PREPARING SLAG SANDS AND AN APPARATUS USED IN THE METHOD

摘要

PURPOSE: A method and apparatus for selectively removing hydrogen sulfide from hydrogen sulfide-containing vapor generated in the manufacture of blast-furnace slag sand by controlling sodium hydroxide to be added are provided, which can remove only hydrogen sulfide that has strong corrosion and is a cause of a bad smell selectively and effectively. CONSTITUTION: This method for removing hydrogen sulfide comprises the steps of: removing cooling water containing sodium hydroxide after introducing sodium hydroxide into cooling water and reacting with hydrogen sulfide; maintaining a pH in accordance with removing efficiency of hydrogen sulfide by introducing sodium hydroxide in an equivalent ratio to a concentration of exhausted hydrogen sulfide after measuring the pH of recovered cooling water; and recycling the pH controlled cooling water.