本文選題：剛玉-尖晶石澆注料 + 防爆劑��； 參考：《武漢科技大學(xué)》2015年碩士論文

【摘要】：隨著現(xiàn)代工業(yè)對鋼鐵品質(zhì)要求的提高，高性能剛玉-尖晶石澆注料在大型鋼包上的使用也越來越廣泛。微粉或者超微粉的加入在提高了剛玉-尖晶石澆注料使用性能的同時(shí)，也提高了澆注料致密度，阻塞了氣孔，使得澆注料在升溫烘烤過程中水蒸氣不易排出，導(dǎo)致其在烘烤過程中抗爆裂性能變差，鋼包烘烤時(shí)間延長，，影響了鋼包周轉(zhuǎn)且造成烘烤成本增加，對于整體施工的襯體和大型預(yù)制件，其影響尤為明顯。 本論文以板狀剛玉骨料和細(xì)粉、鎂砂細(xì)粉、78尖晶石細(xì)粉、α-Al2O3微粉、純鋁酸鈣水泥等為主要原料，通過向剛玉-尖晶石澆注料中添加合適的防爆劑以及對澆注料烘烤排水過程進(jìn)行研究，以使得在不明顯影響澆注料其他性能的情況下，盡可能地改善其抗爆裂性能，并制定合理的烘烤制度，縮短鋼包烘烤時(shí)間。具體研究工作如下： （1）向澆注料中單獨(dú)添加金屬鋁粉、有機(jī)纖維、偶氮酰氨和乳酸鋁，研究各防爆劑對剛玉-尖晶石澆注料防爆等性能的影響。結(jié)果表明：在各防爆劑加入量不致過多的情況下，澆注料的強(qiáng)度、體密和抗渣侵蝕性能并不會(huì)受到太大影響；金屬鋁粉對剛玉-尖晶石澆注料抗爆裂性能改善最為明顯，然而金屬鋁粉添加較多會(huì)對澆注料的基質(zhì)結(jié)構(gòu)造成了很大的破壞；有機(jī)纖維會(huì)嚴(yán)重影響澆注料的流動(dòng)性能，對于澆注料層較厚或者烘烤時(shí)間較長時(shí)，纖維對澆注料抗爆裂性能的改善才會(huì)有較明顯的體現(xiàn)；當(dāng)偶氮酰胺加入量達(dá)0.12%時(shí)澆注料的抗爆裂性能才有較明顯的改善，但其加入過多會(huì)產(chǎn)生較多刺激性氣體NH3，限制了其使用；在添加乳酸鋁后，澆注料的常溫強(qiáng)度改善明顯，但其抗爆裂性能改善甚微，同時(shí)，乳酸鋁的添加也嚴(yán)重降低了澆注料的流動(dòng)性能。 （2）減少防爆劑的加入量，將防爆劑復(fù)合使用，研究了復(fù)合防爆劑對剛玉-尖晶石澆注料性能的影響。結(jié)果表明：防爆劑少量添加復(fù)合使用，可以在不明顯降低澆注料其他性能的基礎(chǔ)之上顯著提高澆注料的抗爆裂性能。復(fù)合添加0.06%金屬鋁粉、0.03%有機(jī)纖維和0.05%的乳酸鋁的試樣抗爆裂性能最好，抗爆裂溫度達(dá)900℃；當(dāng)澆注料中已添加金屬鋁粉時(shí)，偶氮酰氨的加入并不能進(jìn)一步改善其抗爆裂性能；在復(fù)合添加金屬鋁粉和有機(jī)纖維基礎(chǔ)之上，添加少量乳酸鋁會(huì)使得澆注料的抗爆裂性能進(jìn)一步得到很大改善。 （3）剛玉-尖晶石澆注料烘烤過程中發(fā)生爆裂主要是自由水排出受阻所產(chǎn)生的巨大蒸汽壓力，結(jié)構(gòu)水含量少，排出結(jié)構(gòu)水的過程并不會(huì)使得澆注料產(chǎn)生爆裂性破壞。對于實(shí)際澆筑體的烘烤，將烘烤溫度迅速升至200℃或者更高，經(jīng)1~2h保溫后，采取25~35℃/h的慢速連續(xù)升溫，這樣可以有效利用烘烤時(shí)間，也可防止內(nèi)部蒸汽壓力的突然增大或者熱震所導(dǎo)致的爆裂現(xiàn)象。
[Abstract]:High performance corundum-spinel castables are more and more widely used in large ladles with the improvement of steel quality requirements in modern industry. The addition of micro-powder or ultrafine powder not only improves the performance of corundum spinel castable, but also increases the density of castable and blocks the porosity, which makes it difficult to discharge water vapor during heating and baking. As a result, the cracking resistance becomes worse and the ladle baking time is prolonged, which affects the ladle turnover and causes the increase of baking cost, especially for the lining and large preforms of the whole construction. In this paper, the main raw materials are plate corundum aggregate and fine powder, magnesia fine powder, fine spinel powder, 偽 -Al _ 2O _ 3 powder, pure calcium aluminate cement, etc. By adding appropriate explosion-proof agent to the corundum spinel castable and studying the baking drainage process of the castable, the bursting resistance of the castable can be improved as far as possible without obviously affecting the other properties of the castable. A reasonable baking system is established to shorten the baking time of ladle. The specific research work is as follows: 1) adding metal aluminum powder, organic fiber, azo _ 3 and aluminum lactate to the castable separately, and studying the effect of various explosion-proof agents on the explosion-proof properties of corundum spinel castable. The results show that the strength, bulk density and slag corrosion resistance of castable will not be greatly affected when the amount of explosion proof agent is not excessive, and the crack resistance of corundum spinel castable is improved most obviously by aluminum powder. However, the matrix structure of castable can be destroyed greatly by adding more aluminum powder, and the fluidity of castable can be seriously affected by organic fiber, when the layer of castable is thicker or the baking time is longer, Only when the content of azo amide reaches 0.12, the crack resistance of castable can be improved obviously, but too much of it will produce more irritating gas NH _ 3, which limits its use. After adding aluminum lactate, the strength of castable at room temperature is improved obviously, but its crack resistance is improved very little. At the same time, the addition of aluminum lactate also seriously reduces the fluidity of castable. The effect of the composite explosion inhibitor on the properties of corundum-spinel castable was studied. The results show that the explosion resistance of the castable can be improved significantly on the basis of adding a small amount of explosion-proof agent to the compound without obviously reducing the other properties of the castable. Adding 0.06% aluminum powder 0.03% organic fiber and 0.05% aluminum lactate into the compound sample has the best crack resistance, and the crack resistance temperature reaches 900 鈩

本文編號(hào)：2021840