水泥窑三次风闸板用浇注料的制备与性能研究
发布时间：2018-11-20 11:51
【摘要】：三次风闸板是水泥窑系统中关键性设备之一,其控制着三次风的流量。三次风闸板的寿命的长短直接影响着水泥企业的经济效益,其所用耐火浇注料的性能优异又对其寿命长短起决定性作用。由于三次风闸板较为严苛的使用环境使得其寿命往往较短,因此如何提高三次风闸板用浇注料的性能来改善其使用寿命成为耐火材料研究的热点之一。本文采用Al2O3-SiC质低水泥浇注料作为三次风闸用耐火材料的研究对象,选用高铝均化料、碳化硅、焦宝石和氧化铝空心球等为主要原料,分别探讨了颗粒级配、临界粒度、热处理温度、保温时间、升温速率以及轻质骨料技术的应用对浇注料物理性能、力学性能、热震性能以及抗碱性能的影响,借助XRD、SEM等手段分析了上述试验方案对试样矿物相组成和显微结构的影响,确定综合性能较优的配方方案。并结合三次风闸板骨架进行了热震性能探讨试验,探讨了重质骨料浇注料、轻骨料替代重质骨料后浇注料以及对比试验浇注料的性能变化。研究结果表明:(1)颗粒级配和临界粒度的变化不仅影响颗粒间堆积密度,而且对堆积造成的孔径和孔分布影响较大,从而不同颗粒级配以及临界粒度的试样的物理性能、力学性能、热震性能以及抗碱性能都存在较大的差异,随着颗粒级配q值的增大,各性能呈先好后差的趋势,临界粒度越小则各性能相对越差,颗粒级配q=0.28、临界粒度为8mm的试样上述综合性能最优。(2)热处理温度的不同对矿物的组成影响较大,随着热处理温度的增高,试样性能呈先变差后变优的趋势,处理温度为400℃和600℃的试样各性能均相对较差,综合比较各性能差异得到,1200℃热处理的试样综合性能较好。(3)保温时间和升温速率是热处理制度中的重要一环,其它条件不变的前提下,不同保温时间和升温速率处理后的试样矿物组成和显微结构都存在较大的差异,新矿物钙长石相和莫来石相的生成有利于试样物理性能、力学性能和热震性能的提高。综合分析各性能得到5℃/min升温速率、保温3h的试样综合性能较好。(4)选用氧化铝空心球替代重质骨料进行性能测试,得到空心球替代质量分数为10%的重质骨料试样可以保证较高的强度和抗碱性,并且热震性能得到显著的提高。(5)所制备的浇注料与三次风闸板骨架结合制备三次风闸板,性能测试发现,最终优化后的浇注料性能得到显著提高,可以达到有效改善三次风闸板使用寿命的目的。
[Abstract]:The third air gate is one of the key equipments in the cement kiln system, which controls the flow of the third air. The life span of the tertiary air gate directly affects the economic benefit of cement enterprises, and the excellent performance of the refractory castable plays a decisive role in the life span of cement enterprises. Due to the harsh use environment of the tertiary air gate, its life is often shorter, so how to improve the performance of the castable for the third air gate to improve its service life has become one of the hot spots in the research of refractories. In this paper, the Al2O3-SiC low cement castable is used as the research object of the refractory for the third air brake, and the high aluminum homogenized material, silicon carbide, coking gemstone and alumina hollow ball are selected as the main raw materials, and the particle gradation and critical particle size are discussed respectively. The effects of heat treatment temperature, heat preservation time, heating rate and lightweight aggregate technology on the physical properties, mechanical properties, thermal shock properties and alkali resistance of castables were investigated by XRD,. The effects of the above test schemes on the mineral phase composition and microstructure of the samples were analyzed by means of SEM and the formula with better comprehensive properties was determined. The thermal shock test was carried out based on the structure of the third wind gate plate. The castable properties of heavy aggregate castable, lightweight aggregate replacing heavy aggregate and contrast test castable were discussed. The results show that: (1) the variation of particle gradation and critical particle size not only affects the packing density among particles, but also has a great effect on the pore size and pore distribution, thus the physical properties of samples with different particle gradation and critical particle size are obtained. The mechanical properties, thermal shock properties and alkali-resistance properties all have great differences. With the increase of the particle gradation Q value, the properties show a tendency of better first and then worse. The smaller the critical particle size, the worse each performance is, and the smaller the particle size is, the smaller the particle gradation q0.28. The above comprehensive properties of the samples with critical particle size of 8mm are optimal. (2) the different heat treatment temperature has a great influence on the composition of minerals. With the increase of the heat treatment temperature, the properties of the samples tend to become worse first and then better. The properties of the samples treated at 400 鈩，
本文编号：2344834
[Abstract]:The third air gate is one of the key equipments in the cement kiln system, which controls the flow of the third air. The life span of the tertiary air gate directly affects the economic benefit of cement enterprises, and the excellent performance of the refractory castable plays a decisive role in the life span of cement enterprises. Due to the harsh use environment of the tertiary air gate, its life is often shorter, so how to improve the performance of the castable for the third air gate to improve its service life has become one of the hot spots in the research of refractories. In this paper, the Al2O3-SiC low cement castable is used as the research object of the refractory for the third air brake, and the high aluminum homogenized material, silicon carbide, coking gemstone and alumina hollow ball are selected as the main raw materials, and the particle gradation and critical particle size are discussed respectively. The effects of heat treatment temperature, heat preservation time, heating rate and lightweight aggregate technology on the physical properties, mechanical properties, thermal shock properties and alkali resistance of castables were investigated by XRD,. The effects of the above test schemes on the mineral phase composition and microstructure of the samples were analyzed by means of SEM and the formula with better comprehensive properties was determined. The thermal shock test was carried out based on the structure of the third wind gate plate. The castable properties of heavy aggregate castable, lightweight aggregate replacing heavy aggregate and contrast test castable were discussed. The results show that: (1) the variation of particle gradation and critical particle size not only affects the packing density among particles, but also has a great effect on the pore size and pore distribution, thus the physical properties of samples with different particle gradation and critical particle size are obtained. The mechanical properties, thermal shock properties and alkali-resistance properties all have great differences. With the increase of the particle gradation Q value, the properties show a tendency of better first and then worse. The smaller the critical particle size, the worse each performance is, and the smaller the particle size is, the smaller the particle gradation q0.28. The above comprehensive properties of the samples with critical particle size of 8mm are optimal. (2) the different heat treatment temperature has a great influence on the composition of minerals. With the increase of the heat treatment temperature, the properties of the samples tend to become worse first and then better. The properties of the samples treated at 400 鈩，
本文编号：2344834
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