Calcium oxide from calcite decomposition

In system F calcite was used as a calcium source for the formation of gehlenite. The reaction did not proceed as completely as with calcium acetate, as inferred from two observations 1) some of the calcium remained as calcium oxide upon decomposition of... 

Chemical decomposition reactions, in which a solid reactant is heated to produce a new solid plus a gas, are commonly used for the production of powders of simple oxides from carbonates, hydroxides, nitrates, sulfates, acetates, oxalates, alkoxides, and other metal salts. An example is the decomposition of calcium carbonate (calcite) to produce calcium oxide and carbon dioxide gas ... 

Sodium jarosite and gypsum are the major species in the commercial Noranda Inc., CEZinc jarofix product. The finer gypsum particles are formed by the reaction of Na-jarosite and cement, whereas the large crystals are from the original gypsum filter cake. Trace amounts of zinc ferrite, hematite and quartz are present in the jarofix product they originate fiom the jarosite residue. Trace amounts of calcium hydroxide which is a cement reaction product, of calcite which forms from the air-carbonation of of Ca(OH)2, and of Ca-Al-Fe oxide ( Ca4Al2Fe08.5 or Ca2(Al,Fe)205) which is a common cement decomposition species are also detected in the jarofix product. 

Next, low-temperature (<150°C), low-pressure torr) oxygen plasmas oxidized organic components of the sample to CO2. Decomposition of inorganic carbon present (dolomitic limestone rock and calcite/calcium oxalate accretions) was prevented by running the plasmas at low-temperature. Carbon dioxide from the sample was flame-sealed into a glass tube cooled to liquid nitrogen temperature (-194°C), after water had been frozen out with a dry-ice/ethanol slurry (-58°C), and finally sent for radiocarbon analysis at the Center for Accelerator Mass Spectrometry at the Lawrence Livermore National Laboratory (LLNL-CAMS). It was necessary to utilize an AMS measurement due to the small sample size. 

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