Preparation of Ordinary Portland Cement Clinker from Vanadium-titanium Magnetite Tailing
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摘要: 为高效利用承德地区的钒钛磁铁矿尾矿,以该地区的尾矿、石灰石及石英砂为原料,采用高温煅烧的方法制备了普通硅酸盐水泥熟料,探讨了水泥熟料煅烧及养护期间相组成及显微结构的演变规律,分析了该水泥的综合物理性能。结果表明:采用钒钛磁铁矿尾矿∶石灰石∶石英=20∶75∶5的工艺条件,混合料经1 400℃煅烧30 min后,可制备出性能优于42.5R普通硅酸盐水泥标准的熟料。水泥熟料的主要矿物为C3S、C2S、C3A、C4AF及玻璃相。提高煅烧温度与延长煅烧时间,促进了C3S与C3A相的生成。熟料水化后将生成针棒状的钙矾石、板片状的氢氧化钙及无定形态的C-S-H。延长水化时间提高了C-S-H产量,促进了样品的致密化及改善了样品的强度。研究制备的熟料与5%石膏复合,可得到性能优于GB 175—2007中42.5R等级的普通硅酸盐水泥。Abstract: To efficiently utilize the vanadium–titanium magnetite tailing in Chengde area,ordinary portland cement clinker was prepared by high temperature calcination using the tailing,limestone and quartz sand as raw materials.The evolution of phase compositions and microstructure of the cement clinker during calcination and curing was discussed,and the comprehensive physical properties of the cement were analyzed.The clinker having a better properties than 42.5 R ordinary portland cement can be prepared by calcination at 1 400 ℃ for 30 min with the ratio of vanadium-titanium magnetite tailing∶limestone∶quartz=20∶75∶5.The clinker obtained is mainly composed of C3S,C2S,C3A,C4AF and glass phases.The formations of C3S and C3A phases are promoted by increasing the calcination temperature and prolonging the calcination time.After hydration,needle and bar like ettringite,plate like calcium hydroxide and amorphous C-S-H are formed in the clinker.With extension of the hydration time,the content of C-S-H increases,improving the compactness and strength of the sample.An ordinary portland cement with better performances than 42.5 R grade in GB 175-2007 standard can be obtained by compounding the clinker prepared with 5% gypsum.
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Key words:
- vanadium-titanium magnetite /
- tailings /
- cement clinker /
- high temperature calcination /
- structure /
- performance
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