XDL煅烧工艺处理高镁原料烧制高性能水泥熟料机理研究

发布时间：2018-03-06 07:47

本文选题：高镁石灰石原料　切入点：XDL系统　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：水泥工业一直是我国经济发展中不可缺少的重要角色,并且随着水泥工业的发展,高品质石灰石资源已日趋紧缺,高镁质石灰石因为氧化镁含量高,影响水泥后期安定性的原因而得不到有效利用,资源危机越来越严重。如何充分有效的利用高镁质石灰石资源已成为水泥行业发展中亟需解决的难题。因此,通过对NSP和XDL煅烧工艺的现场调研和分析,以及对NSP和XDL煅烧工艺煅烧所得水泥熟料作系统的对比研究,找出两种煅烧工艺煅烧所得熟料的差异性,揭示XDL工艺处理高镁原料烧制高性能水泥熟料的原因,旨在探索出一条适合高镁质石灰石资源在水泥行业有效利用的方法,其研究结果表明:(1)XDL煅烧工艺更有利于MgO在熟料中的固溶,从而减少熟料中方镁石含量,且熟料质量稳定。说明XDL煅烧系统能更好的适应高镁原料,更有利于高镁原料的煅烧。(2)与NSP系统相比较,采用XDL系统煅烧高镁石灰石原料可以将更多的MgO固溶在熟料中,减少熟料中方镁石含量,有利于水泥后期的安定性;XDL系统煅烧所得熟料中方镁石含量少,方镁石平均尺寸不足1.0μm,且熟料中各矿物相与液相量分布均匀,A矿晶粒形状规则,尺寸平均值为30μm;NSP系统煅烧所得熟料中的A矿以M3型为主,多为细小晶体,XDL系统煅烧高镁石灰石原料能够将熟料中A矿更多的稳定为M1型;相比NSP系统,XDL系统煅烧高镁石灰石原料所得熟料后期强度增长迅速,其3~28d强度增幅比NSP系统煅烧的熟料高出7.61MPa。(3)XDL工艺系统具有固硫作用,适当的SO3能够有效减少高镁熟料中方镁石含量,有利于高镁熟料中氧化镁的固溶,促进C3S晶粒尺寸的增大,并且能够将熟料中C3S更多的稳定为M1型,提高熟料的力学性能。
[Abstract]:Cement industry has always been an indispensable role in the economic development of our country, and with the development of cement industry, high quality limestone resources have become increasingly scarce, high magnesia limestone because of the high content of magnesium oxide, The reasons that affect the stability of cement in the later period can not be used effectively, and the resource crisis is becoming more and more serious. How to make full and effective use of high magnesium limestone resources has become a difficult problem in the development of cement industry. Based on the field investigation and analysis of NSP and XDL calcination process, as well as the systematic comparative study on the cement clinker calcined by NSP and XDL calcination process, the differences of clinker between the two calcination processes are found out. In order to find a suitable method for the efficient utilization of high magnesium limestone resources in cement industry, this paper reveals the reason why high magnesium raw material is fired into high performance cement clinker by XDL process, in order to find out a suitable method for the utilization of high magnesium limestone resources in cement industry. The results show that the MgO calcination process is more favorable to the solid solution of MgO in clinker, thus reducing the content of periclase in clinker and the quality of clinker is stable. It shows that the XDL calcination system can better adapt to high magnesium raw material. Compared with NSP system, calcining high magnesium limestone with XDL system can dissolve more MgO in clinker and reduce the content of periclase in clinker. The clinker calcined by XDL system in favor of the later stage of cement has less periclase content, less than 1.0 渭 m average size of periclase, and the distribution of mineral phase and liquid phase in clinker is uniform and the grain shape of ore A is regular. The average size is 30 渭 m NSP system calcined clinker A ore is mainly M3 type, most of which are fine crystal XDL system calcined high magnesium limestone raw materials can stabilize the clinker A ore to M1 type. Compared with the clinker from calcined high magnesium limestone by NSP system, the strength of clinker increased rapidly in 328d, and the increase of clinker strength was 7.61MPa.f3XDL higher than that of clinker calcined by NSP system. Proper SO3 can effectively reduce the content of periclase in high magnesium clinker, which is beneficial to the solid solution of magnesium oxide in high magnesium clinker, promote the increase of grain size of C3s, and can stabilize more C3S in clinker to M1 type, so as to improve the mechanical properties of clinker.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ172.6

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