煅烧温度对水泥熟料主要矿物形成的影响

Influence of Calcination Temperature on Formation of Portland Cement Clinker Minerals

选取SP窑硅酸盐水泥熟料、NSP窑硅酸盐水泥熟料和低热水泥熟料在1350℃、1450℃和1500℃三种温度下进行煅烧,对每种熟料在不同温度煅烧下的样品进行XRD定性、定量分析和岩相分析。研究结果表明,高温煅烧后熟料中C3S主要以M1型和M3型存在,R型C3S不明显,未发现T型C3S。此外,煅烧温度的变化对熟料中各矿物晶型和含量影响较大。随温度升高,硅酸盐矿物中C3S总体含量通常提高,C2S含量降低;三种熟料中的C3A都呈减少趋势,而C4AF则呈增加趋势,总矿物在最高温度1500℃时达到最大值。随温度升高,矿物存在不同程度的晶型转变,通常M1型C3S向M3型C3S转变。不同温度下熟料的岩相也不同,比较各熟料岩相分析结果与XRD分析结果相吻合。

Choosing the SP kiln Portland cement clinker, NSP kiln Portland cement clinker and low thermal cement clinker to be calcined at the temperature of 1350 ℃, 1450 ℃ and 1500 ℃ respectively, and each clinker sample calcined at different temperature was studied through XRD qualitative and quantitative analysis as well as lithofacies analysis. The results showed that, a lot of M1 and M3 types of C3S, little R type of C3S and no T type of C3S in the clinker calcined under the high temperature were found. Besides, the change of calcination temperature had great effect on the crystal form and content of each mineral in the clinker. As the temperature increased, the total content of C3S in the silicate minerals went up while the content of C2S went down,besides,the content of C3A in all of the three kinds of clinker decreased while the content of C4AF increased ,and the total content of silicate minerals reached to a maximum. With the temperature increasing, crystal transformation in different degrees in the minerals, the type of C3S changed from M1 to M3 usually. The lithofacies of the clinkers varied according to the temperatures,and the results of lithofacies analysis agreed well with the results of XRD qualitative and quantitative analysis.