A method of obtaining oxides by heating metal hydroxides and carbonates to expel bound water and carbon dioxide gas. An example is the burning of limestone (CaCO 3) to produce quicklime (CaO), the reaction being CaCO 3 + heating → CaO + CO 2. An important step in metal smelting is the calcination of high-purity aluminum hydroxide obtained by the Bayer process to obtain pure alumina, the reaction being 2Al(OH) 3 + heating → Al 2 O 3 + 3H 2 O. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
金属の水酸化物,炭酸塩を加熱して結合水,炭酸ガスを追出し,酸化物を得る方法。石灰石 CaCO3 を焼いて生石灰 CaO とするのがその例で,反応は CaCO3+加熱→CaO+CO2 である。金属製錬で重要なのは,バイヤー法で得られる高純度水酸化アルミニウムを 煆焼して純アルミナを得る工程で,反応は 2Al(OH)3+加熱→Al2O3+3H2O である。
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