Method for reducing sulfide odors from kraft mill lime kiln stacks

Abstract

Abstract A PROCESS FOR THE REDUCTION OF MALODORS EMITTED FROM KRAFT MILL LIME KILN STACKS IN THE MANUFACTURE OF PULP BY THE "KRAFT" OR SULPHATE CELLULOSE PROCESS. THE COOKING OF WOOD CHIPS WITH WHITE LIQUOR IS FOLLOWED BY THE STEPS OF SEPARATING THE BLACK LIQUOR FROM THE PULP, EVAPORATING EXCESS WATER FROM THE LIQOUR, BURNING THE EVAPORATED LIQUOR TO FORM GREEN LIQUOR AND THEN TREATING THE GREEN LIQUOR WITH LIME TO FORM WHITE LIQUOR AND A LIME MUD SLURRY. THE WHITE LIQUOR IS RECYCLED FOR THE COOKING FOR FURTHER CHIPS AND THE LIME MUD SLURRY IS CALCINED IN A KILN TO PRODUCE LIME AND CARBON DIOXIDE. THE SLURRY IS INTIMATELY MIXED WITH AN OXIDIZING AGENT TO REDUCE THE SULFIDE CONTENT OF THE SLURRY BEFORE THE SLURRY IS BURNED IN THE LIME KILN. THE OXIDIZING AGENT MAY BE A GAS SUCH AS AIR, CHLORINE OR CHLORINE DIOXIDE. THE GASEOUS OXIDIZING AGENT MAY SUITABLY BE INTIMATELY MIXED WITH THE SLURRY BY THE USE OF AN OXIDATION TUBE OR ANY SUITABLE CONTACT APPARATUS,

Inventors

• 👤 B Sen

Bibliographic Details