Process for dissolving ash containing sodium sulfide and sodium carbonate

Claim 1

THE IMPROVEMENT IN THE TREATMENT OF WASTE LIQUORS FROM THE SULFATE AND SODIUM SULFITE COOKING PROCESSES WHICH COMPRISES ADDING THE FUSED ASH FROM THE EVAPORATION, CARBONIZING AND REDUCTION OF SUCH WASTE LIQUORS, AND CONTAINING MAINLY SODIUM SULFIDE AND CARBONATE, CONTINUOUSLY TO A LARGE CIRCULATING BODY OF HOT, CONCENTRATED SODIUM SULFIDE SOLUTION CONTAINING FROM 2 TO 5 POUNDS OF WATER PER POUND OF SODIUM SULFIDE (NA2S) AND HAVING A LIMITED SOLUBILITY FOR SODIUM CARBONATE AND CONTAINING IN SUSPENSION A LIMITED AMOUNT OF SODIUM CARBONATE, CONTINUOUSLY ADDING WATER TO SAID BODY IN PROPORTION TO FORM FURTHER AMOUNTS OF HOT CONCENTRATED SODIUM SULFIDE SOLUTION WITH THE ADDED SODIUM SULFIDE OF THE MOLTEN ASH AND TO FORM ADDED AMOUNTS OF SODIUM CARBONATE IN SUSPENSION IN SAID BODY, CONTINUOUSLY WITHDRAWING FROM SAID BODY A PORTION OF THE HOT CONCENTRATED SODIUM SULFIDE SOLUTION AND SUSPENDED CARBONATE, SEPARATING SUSPENDED CARBONATE THEREFROM, CONTINUOUSLY RECYCLING A PORTION OF THE RESULTING HOT CLEAR CONCENTRATED SODIUM SULFIDE LIQUOR TO SAID LARGE BODY, AND CONTINUOUSLY WITHDRAWING A PORTION OF THE CONCENTRATED SODIUM SULFIDE LIQUOR, THE PROPORTION OF RECYCLED HOT CONCENTRATED SODIUM SULFIDE SOLUTION BEING SEVERAL TIMES GREATER THAN THE AMOUNT OF FRESH SOLUTION FORMED.