千锤万凿出深山 ---物理变化.
烈火焚烧若等闲 --- CaCO3 =（高温）= CaO + CO2↑
粉身碎骨浑不怕 --- CaO + H2O = Ca(OH)2
要留清白在人间 --- Ca(OH)2 + CO2 = CaCO3↓ + H2O