US PATENT SUBCLASS 423 / 175
.~.~.~ Calcining

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
155  DF  .~ Alkaline earth metal (Mg, Ca, Sr, or Ba) {11}
173  DF  .~.~ Treating impure carbonate (e.g., oyster shells, etc.) {2}
175.~.~.~ Calcining {2}
176  DF  .~.~.~.~> Utilizing vacuum or steam
177  DF  .~.~.~.~> With agitating or at specified temperature

DEFINITION

Classification: 423/175

(under subclass 173) Processes which include the step of heating the impure carbonate.

(1) Note. The end result of calcining an impure carbonate is usually the oxide due to driving off the carbon dioxide (CO2).