Assertion: ammonium carbonate | /r/AtLocation | the process
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Source sentences:
text: Ammonium Carbonate (40) solution ranging from 25% to 35% and preferably about 33% ammonium carbonate, at a temperature ranging from 75° F. to 120° F., preferably 110° F. to 120° F. and most preferably about 115° F., is introduced to the process by first passing through the filter cake of calcium carbonate at Zone B of Filter No. 3 (42).