PROCESS FOR CONVERTING FGD GYPSUM TO AMMONIUM SULFATE AND CALCIUM CARBONATE

PROCESS FOR CONVERTING FGD GYPSUM TO AMMONIUM SULFATE AND CALCIUM CARBONATE

A continuous countercurrent flow process for converting FGD gypsum to ammonium sulfate and calcium carbonate including countercurrent flows with internal recycle of liquids to maximize the purity of reaction products while minimizing reaction times, and further include embodiments of the process tha...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HASINOFF, MURRAY, P, COCHRAN, KEITH, D, HOLT, TIMOTHY, G, SHIRLEY, ARTHUR, R, PURSELL, TAYLOR, SAIIA, JOSEPH, A
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
AMMONIA
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
COMPOUNDS THEREOF
CYANOGEN
INORGANIC CHEMISTRY
METALLURGY
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Beschreibung
Zusammenfassung:A continuous countercurrent flow process for converting FGD gypsum to ammonium sulfate and calcium carbonate including countercurrent flows with internal recycle of liquids to maximize the purity of reaction products while minimizing reaction times, and further include embodiments of the process that provide a yield of both ammonium sulfate and calcium carbonate to be 97 to 100%, and embodiments that provide for processes having a total time of reaction being 8 to 12 minutes, the invention further including processes for removing contaminants from the FGD gypsum employing an acid rinse process and/or a slurry tank reactor process.