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CaO aggregate was sintered from reagent-grade lightweight CaCO 3 powder by the addition of 0–20% (molar ratio) MgO and ZrO 2 , respectively. The results showed that the CaO derived from lightweight CaCO 3 was highly sinterable and compact CaO aggregate with relative density above 96% was obtained after sintering at 1400 °C for 2 h, but further increase of compactness was restrained...
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