冷却方式对不同铝率高镁熟料烧成与方镁石形成的影响  

Effect of Cooling Methods on Clinkering and Periclase Formation of High–Magnesium Portland Clinker with Different Alumina Modulus

作　　者：张文生 栾政彬 任雪红 张洪滔 叶家元 安楠 ZHANG Wensheng;LUAN Zhengbin;REN Xuehong;ZHANG Hongtao;YE Jiayuan;AN Nan(State Key Laboratory of Green Building Materials,China Building Materials Academy,Beijing 100024,China)

机构地区：[1]中国建筑材料科学研究总院有限公司,绿色建筑材料国家重点实验室,北京100024

出　　处：《硅酸盐学报》2022年第11期2809-2817,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51872272);中国建材集团攻关专项(2021HX0304)资助项目。

摘　　要：采用化学试剂制备了MgO掺量为6%的高镁硅酸盐水泥熟料,利用X射线衍射结合Rietveld、岩相分析和扫描电镜等方法,研究了随炉慢冷、风冷和液氮淬冷等3种冷却方式对铝率(IM)分别为0.64、1.10和3.00的3种高镁硅酸盐熟料的矿物组成、C_(3)S晶型、MgO固溶、方镁石形成及形貌等的影响。结果表明:淬冷方式有助于稳定M3型C_(3)S的存在,阻止C_(3)S向T3晶型转变,并且这和IM变化没有明显联系。在低IM慢冷和高IM淬冷的熟料中,C_(3)S含量均相对较高。冷却速率高可以抑制方镁石析晶。这种抑制效果在低IM熟料中显得更为明显。熟料淬冷能使C_(3)S晶体形貌保持完整,同时方镁石晶体则呈现细小的圆粒状。High–magnesium Portland cement clinker with MgO content of 6% was synthesized with chemical reagent. The effect of cooling method(i.e., furnace cooling, air cooling and liquid–nitrogen quenching) on the mineral composition, C_(3)Scrystal type, solid solubility of MgO, and formation of periclase of high–magnesium Portland clinkers with different alumina modulus(IM)(i.e., 0.64,1.10 and 3.00) was investigated. The samples were characterized by X-ray powder diffraction with Rietveld method, petrographic method and scanning electron microscopy. The results show that a rapid cooling can stabilize C_(3)Scrystal into M3 type, and prevent the transformation of C_(3)Scrystal from M3 to T3 type. And this has a little effect on the change of IM. The content of C_(3)Sis relatively high in the clinker with a low IM and by furnace cooling, and the clinker with a high IM and by liquid–nitrogen quenching. Rapid cooling rate inhibits the crystallization of periclase, and the inhibition effect is more dominant in a low IM clinker. Clinker quenching can keep the morphology of C_(3)Sintact, and promote periclase to turn into a fine round granule.

关 键 词：冷却方式 铝率 高镁硅酸盐熟料 烧成 方镁石 

分 类 号：TQ172.11[化学工程—水泥工业]