【摘要】：三次風(fēng)閘板是水泥窯系統(tǒng)中關(guān)鍵性設(shè)備之一,其控制著三次風(fēng)的流量。三次風(fēng)閘板的壽命的長短直接影響著水泥企業(yè)的經(jīng)濟效益,其所用耐火澆注料的性能優(yōu)異又對其壽命長短起決定性作用。由于三次風(fēng)閘板較為嚴苛的使用環(huán)境使得其壽命往往較短,因此如何提高三次風(fēng)閘板用澆注料的性能來改善其使用壽命成為耐火材料研究的熱點之一。本文采用Al2O3-SiC質(zhì)低水泥澆注料作為三次風(fēng)閘用耐火材料的研究對象,選用高鋁均化料、碳化硅、焦寶石和氧化鋁空心球等為主要原料,分別探討了顆粒級配、臨界粒度、熱處理溫度、保溫時間、升溫速率以及輕質(zhì)骨料技術(shù)的應(yīng)用對澆注料物理性能、力學(xué)性能、熱震性能以及抗堿性能的影響,借助XRD、SEM等手段分析了上述試驗方案對試樣礦物相組成和顯微結(jié)構(gòu)的影響,確定綜合性能較優(yōu)的配方方案。并結(jié)合三次風(fēng)閘板骨架進行了熱震性能探討試驗,探討了重質(zhì)骨料澆注料、輕骨料替代重質(zhì)骨料后澆注料以及對比試驗澆注料的性能變化。研究結(jié)果表明:(1)顆粒級配和臨界粒度的變化不僅影響顆粒間堆積密度,而且對堆積造成的孔徑和孔分布影響較大,從而不同顆粒級配以及臨界粒度的試樣的物理性能、力學(xué)性能、熱震性能以及抗堿性能都存在較大的差異,隨著顆粒級配q值的增大,各性能呈先好后差的趨勢,臨界粒度越小則各性能相對越差,顆粒級配q=0.28、臨界粒度為8mm的試樣上述綜合性能最優(yōu)。(2)熱處理溫度的不同對礦物的組成影響較大,隨著熱處理溫度的增高,試樣性能呈先變差后變優(yōu)的趨勢,處理溫度為400℃和600℃的試樣各性能均相對較差,綜合比較各性能差異得到,1200℃熱處理的試樣綜合性能較好。(3)保溫時間和升溫速率是熱處理制度中的重要一環(huán),其它條件不變的前提下,不同保溫時間和升溫速率處理后的試樣礦物組成和顯微結(jié)構(gòu)都存在較大的差異,新礦物鈣長石相和莫來石相的生成有利于試樣物理性能、力學(xué)性能和熱震性能的提高。綜合分析各性能得到5℃/min升溫速率、保溫3h的試樣綜合性能較好。(4)選用氧化鋁空心球替代重質(zhì)骨料進行性能測試,得到空心球替代質(zhì)量分數(shù)為10%的重質(zhì)骨料試樣可以保證較高的強度和抗堿性,并且熱震性能得到顯著的提高。(5)所制備的澆注料與三次風(fēng)閘板骨架結(jié)合制備三次風(fēng)閘板,性能測試發(fā)現(xiàn),最終優(yōu)化后的澆注料性能得到顯著提高,可以達到有效改善三次風(fēng)閘板使用壽命的目的。
[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，

本文編號：2344834