Ammonium sulfate and calcium oxide manufacture

Claim 1

A PROCESS FOR THE MANUFACTURE OF AMMONIUM SULFATE IN EXCEPTIONALLY HIGH YIELD AND CALCIUM OXIDE WITH AN AVAILABLE LIME CONTENT ABOVE 70 WEIGHT PER CENT BY THE REACTION OF CALCIUM SULFATE WITH AMMONIUM CARBONATE, WHICH COMPRISES PASSING A CARBON DIOXIDE-CONTAINING GAS TO A CARBONATION ZONE WHEREIN SAID GAS IS COOLED AND CONTACTED WITH AMMONIA IN SUCH A MANNER THAT SAID AMMONIA REACTS WITH THE CARBON DIOXIDE IN SAID GAS THEREBY FORMING AMMONIUM CARBONATE, REACTING CALCIUM SULFATE AND THUSPREPARED AMMONIUM CARBONATE IN A AQUEOUS MEDIUM IN A MULTI-STAGE REACTIONZONE WHEREIN EACH STAGE IS OF INCREASING SIZE AND DECREASING AGITATION, INTRODUCING THE AMMONIUM CARBONATE TO THE FIRST STAGE OF SAID REACTION ZONE IN SUCH QUANTITY THAT IT REMAINS IN EXCESS THROUGHOUT THE REACTION, SEPARATING THE REACTION PRODUCT IN SUCH A MANNER THAT ALL OF THE SOLID MATERIAL IS REMOVED FROM THE AQUEOUS AMMONIUM SULFATE LIQUOR, STORING THUS-PRODUCED AMMONIUM SULFATE LIQUOR ONLY AFTER ALL OF THE SOLID CONTENT HAS BEEN REMOVED, SEPARATING CALCIUM CARBONATE RECOVERED FROM SAID AMMONIUM SULFATE LIQUOR FROM SILICA IMPURITY BY MEANS OF FROTH FLOTATION, ADMIXING WITH THUS-TREATED CALCIUM CARBONATE LOW ASH CARBONACEOUS MATERIAL, BURINIG SAID ADMIXRURE AT AN ELEVATED TEMPERATURE AND THEREBY CALCIUM SAID CALCIUM CARBONATE TO CALCIUM OXIDE AND REMOVING PHOSPHATE IMPURITY, AND RECOVERING CALCIUM OXIDE WITH AN AVAILABLE LIME CONTENT ABOVE 70 WEIGHT PER CENT AS A PRODUCT OF THE PROCESS.