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- W1987646957 abstract "The effect of superheated steam on the decomposition of CaCO 3 and MnCO 3 and on the solid state reactions of ZnCO 3 -FeOOH and MnCO 3 -CaCO 3 was investigated. A newly developed apparatus for the experiments under 1 atm of pure water vapor was used. CaCO 3 decomposed at 800 oC in the superheated steam to form the single phase of CaO. On the other hand, the decomposition was uncompleted in air. CaCO 3 transformed into CaO via Ca (OH) 2 in superheated steam. During the transformation of carbonate into hydroxide, the crystal lattice is temporarily disordered to make it active, leading lower decomposition temperature of CaCO 3 . MnCO 3 decomposed to form γ-Mn 2 O 3 at above 1000 oC in air, whereas γ-Mn 2 O 3 was obtained at 800 oC in the superheated steam. The solid state reaction in the steam was suppressed for the mixture of ZnCO 3 and FeOOH. This seemed to be due to the large difference in decomposition temperature between ZnCO 3 and FeOOH. MnCO 3 reacted with CaCO 3 to form CaMn 2 O 4 at 800 oC in the superheated steam. However, a higher temperature of 1000 oC was required to cause the reaction in air. The low-temperature transformation of MnCO 3 and CaCO 3 in the superheated steam would affect the reaction. It was concluded that the reactivity of carbonate in super heated steam was promoted by the Hedvall effect, which was caused by the formation of intermediate phase such as hydroxide." @default.
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- W1987646957 date "2014-06-01" @default.
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- W1987646957 title "Reactivity of Carbonates in Superheated Steam under Atmospheric Pressure" @default.
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- W1987646957 doi "https://doi.org/10.4028/www.scientific.net/kem.617.225" @default.
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