Process for production and separation of sodium sulfide and sodium carbonate from spent liquors

Claim 1

THE PROCESS OF TREATING SMELT DERIVED FROM SPENT LIQUOR CONTAINING SODIUM CARBONATE AND SODIUM SULFIDE TO SEPARATE SODIUM CARBONATE FROM THE SODIUM SULFIDE THAT INCLUDES THE STEPS OF BLOWING A STREAM OF THE LIQUID SMELT WITH A JET OF STEAM TO BREAK UP THE SMELT INTO VERY FINELY DIVIDED FORM; ALLOWING THE SMELT IN THE FINELY DIVIDED FORM TO SOLIDIFY; ADDING THE FINELY DIVIDED SOLID SMELT TO AN AQUEOUS MEDIUM AND DISSOLVING SUBSTANTIALLY ALL THE FINELY DIVIDED SMELT IN THE AQUEOUS MEDIUM TO PRODUCE A CONCENTRATED SOLUTION OF SODIUM SULFIDE AND SODIUM CARBONATE; CRYSTALLIZING SODIUM CARBONATE FROM SAID CONCENTRATED SOLUTION; AND SEPARATING THE SOLID CRYSTALLIZED SODIUM CARBONATE FROM THE CONCENTRATED SOLUTION TO LEAVE A CONCENTRATED SOLUTION CONTAINING THE SODIUM SULFIDE.