Method of treating cellulosic pulping waste liquors with magnesium oxide to form a complex prior to burning thereof

Claim 1

A METHOD OF TREATING THE AQUEOUS WASTE LIQUOR FROM WOOD AND SIMILAR CELLULOSIC PULPING OPERATIONS WHEREIN SAID WASTE LIQUOR CONTAINS RESIDUES FROM THE CHEMICAL DIGESTION OF LIGNIN AND HEMICELLULOSES, AS WELL AS RECOVERABLE PULPING CHEMICALS, COMPRISING: COMMINGLING WITH AT LEAST A PORTION OF SAID WASTE LIQUOR A SUBSTANTIAL AMOUNT OF AN INORGANIC CARRIER IN AN AMOUNT SUFFICIENT TO INCREASE THE INORGANIC CONTENT OF THE TOTAL SOLIDS IN THE WASTE LIQUOR TO WITHIN THE RANGE OF ABOUT 5% TO 70% AND TO RAISE THE PH TO WITHIN THE RANGE OF ABOUT 8.5% TO ABOUT 10.0%, THEREBY FORMING A SEBARABLE SOLID COMPLEX OF RESIDUES AND CARRIER, SAID CARRIER BEING MAGNESIUM OXIDE, BURNING THE COMBINATION OF SAID WASTE LIQUOR RESIDUES AND INORGANIC CARRIER UNDER OXIDIZING COMBUSTION CONDITIONS TO SUBSTANTIALLY BURN OFF ORGANIC MATERIAL IN SAID WASTE LIQUOR RESIDUES AND TO RECLAIM SAID INORGANIC CARRIER AS A FURNACE ASH CONTAINING SAID CARRIER IN THE FORM OF THE OXIDE, AND RECYLING AT LEAST A PORTION OF SAID INORGANIC CARRIER TO THE COMMNGLYING STEP.