METHOD FOR REMOVING TOTAL OF MERCURY CONTAINED IN EXHAUST GAS AND MERCURY CONTAINED IN WASTE WATER OF SMOKE CLEANING

摘要

PURPOSE:To efficiently remove Hg by absorbing water soluble Hg contained in exhaust gas with washing liquid and absorbing water insoluble Hg with absorbing liquid contg. hypochlorite and recovering Hg vapor which is produced by adding hydrazine to washing waste water. CONSTITUTION:Hg-contg. gas is introduced into a smoke cleaning tower 1 and alkaline washing liquid is dispersed in a lower part chamber 3 to absorb soluble Hg and then insoluble Hg is absorbed with absorbing liquid contg. sodium hypochlorite in the upper part chamber 2. Waste water produced by smoke cleaning is once stored in a waste water storage tank 4 and sodium hypochlorite is added to change Hg difficult-to be decomposed which is contained in waste water into a mode to be easily vaporized and thereafter it is fed to an Hg vaporizing tank 5 and hydrazine is added to reduce and vaporize Hg contained in waste water and the produced Hg vapor is recovered with an adsorbent of a recovering device 6.