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通过高温合成2Ca SO4·K2SO4复盐,再将其以不同掺量掺入Ca CO3、Si O2、Al2O3和Fe2O3组成的水泥生料中,在1 450℃煅烧至水泥熟料中f-Ca O小于1%。研究了2Ca SO4·K2SO4复盐对水泥熟料高温烧成过程、矿物组成与结构及水化性能的影响。结果表明:2Ca SO4·K2SO4降低了Ca CO3起始分解温度,改变了熟料的熔融液相性质,增加了液相量,降低了矿物的最低共熔温度;2Ca SO4·K2SO4提高了熟料中C3S含量,降低了C3A和C4AF含量,烧成熟料中C2S晶型主要为β型,也存在少量γ型,2Ca SO4·K2SO4使C3S晶型由R型向M1型转变,但晶型不随掺量改变。复盐的掺入缩短了熟料水化的诱导期,促使第二水化放热峰最大值提前出现,2Ca SO4·K2SO4掺量增加抑制了熟料前期和后期水化性能,提高了中期水化放热速率。
The high-temperature synthesis of 2Ca SO4 · K2SO4 double salt, and then mixed with different dosages CaCO3, Si O2, Al2O3 and Fe2O3 cement raw materials, calcined at 1450 ℃ to cement clinker f-Ca O is less than 1%. The effects of 2Ca SO4 · K2SO4 double salt on the calcination process, mineral composition and structure and hydration performance of cement clinker were studied. The results showed that 2Ca SO4 · K2SO4 reduced the initial decomposition temperature of CaCO3, changed the melt phase properties of clinker, increased the amount of liquid phase and decreased the minimum eutectic temperature of the mineral. 2Ca SO4 K2SO4 increased the initial decomposition temperature of the clinker C3S content and C3A and C4AF content decreased, C2S crystal form of calcined clinker mainly β type, there are also a small amount of γ-type, 2Ca SO4 · K2SO4 C3S crystal form from R to M1 type transition, The amount of change. The incorporation of double salt shortened the induction period of clinker hydration and promoted the maximum value of second hydration exothermic peak appearing earlier. The increase of 2Ca SO4 · K2SO4 content restrained the hydration performance of early and late clinker, The heat release rate.