Particulate Matter and Methods of Obtaining Same from a Kraft Waste Reclamation

Abstract

The present invention relates in general to a method of scrubbing a waste gas, the method comprising: mixing HBr with washed dregs from a pulp mill green liquor clarifier to produce an activated carbon capable of oxidizing mercury; injecting the activated carbon slurry with HBr into a waste gas containing mercury at a temperature of from about 600° F. to about 900° F., thereby drying the activated carbon and oxidizing the mercury; and collecting the dried activated carbon and oxidized mercury on a filter.

What is claimed is: 
     
         1 . A method for producing activated carbon, the method comprising: removing dregs from a pulp mill green liquor clarifier, washing the dregs with water to produce an activated carbon slurry. 
     
     
         2 . The method of  claim 1 , further comprising adding an acid to the activated carbon slurry. 
     
     
         3 . The method of  claim 1 , further comprising milling the activated carbon slurry to produce an activated carbon particle size of 10-50 microns. 
     
     
         4 . A method of scrubbing a waste gas, the method comprising: mixing HBr with the activated carbon slurry from  claim 1  to produce an activated carbon capable of oxidizing mercury; injecting the activated carbon slurry with HBr into a waste gas containing mercury at a temperature of from about 600° F. to about 900° F., thereby drying the activated carbon and oxidizing the mercury; and collecting the dried activated carbon and oxidized mercury on a filter.