CN115504772A - 一种rh炉浸渍管用浇注料及其制备方法 - Google Patents
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- GWWPLLOVYSCJIO-UHFFFAOYSA-N dialuminum;calcium;disilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] GWWPLLOVYSCJIO-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种RH炉浸渍管用浇注料，包括板状刚玉、α‑Al2O3微粉、ρ‑Al2O3、96硅微粉、减水剂、防爆纤维、耐热不锈钢纤维。同时公开了一种一种RH炉浸渍管用浇注料的制备方法，首先按质量百分比将0.088mm电熔镁砂细粉、双峰α‑Al2O3微粉、单峰α‑Al2O3微粉、96硅微粉及减水剂加入圆锥式预混机内，预混30分钟，制得预混粉，然后按质量百分比向混料机内加入板状刚玉骨料、防爆纤维和耐热不锈钢纤维混炼2分钟，再向混料机内加入制备的预混粉混炼6分钟即得。本发明使用ρ‑Al2O3作为RH炉浸渍管用刚玉尖晶石浇注料结合剂，然后添加复合α‑Al2O3微粉及电熔镁砂，可以显著提高材料的荷重软化温度、高温强度和显著改善材料的抗渣性能，提高RH炉浸渍管使用寿命。
Description
技术领域
本发明属于耐火材料技术领域，特别是一种RH炉浸渍管用浇注料及其制备方法。
背景技术
目前，RH炉浸渍管用浇注料主要为铝酸钙结合的刚玉尖晶石浇注料。纯铝酸钙水泥一般含20％-30％的CaO。在高温下CaO可与材料中的Al2O3和SiO2发生反应，生成两个低熔点化合物钙长石(熔点1553℃)和钙铝黄长石(熔点1593℃)。对于CaO-SiO2-MgO-Al2O3-FeO-CaF2-MnO这样更为复杂的RH炉渣系来讲，纯铝酸钙水泥结合浇注料在1200℃左右就会出现液相反应，降低浇注料的抗侵蚀性能及高温强度，降低了整个浸渍管的使用寿命。
发明内容
本发明的目的在于克服现有技术中普通耐火砖密度大、导热系数大的缺点，提供一种RH炉浸渍管用浇注料。
本发明的目的之一在于提供一种RH炉浸渍管用浇注料，包括板状刚玉、α-Al2O3微粉、ρ-Al2O3、96硅微粉、减水剂、防爆纤维、耐热不锈钢纤维。
优选的，按质量百分数记，板状刚玉82.12％、α-Al2O3微粉10％、ρ-Al2O3 4％、96硅微粉0.5％、减水剂0.8％、防爆纤维0.08％、耐热不锈钢纤维2.5％。
优选的，包括板状刚玉、α-Al2O3微粉、ρ-Al2O3、96硅微粉、减水剂、防爆纤维、耐热不锈钢纤维、电熔镁砂细粉。
优选的，包括板状刚玉76.12％、α-Al2O3微粉10％、ρ-Al2O3 4％、96硅微粉0.5％、减水剂0.8％、防爆纤维0.08％、耐热不锈钢纤维2.5％、电熔镁砂细粉6％。
优选的，所述α-Al2O3微粉包括双峰α-Al2O3微粉、单峰α-Al2O3微粉。
优选的，所述双峰α-Al2O3微粉、单峰α-Al2O3微粉比例各占所述α-Al2O3微粉50％。
优选的，所述电熔镁砂细粉粒度为0.088mm。
本发明的目的之二在于提供一种RH炉浸渍管用浇注料的制备方法，包括如下步骤，
1)将块状电熔镁砂制成粒度为0.088mm的细粉；
2)按质量百分比进行配料，将电熔镁砂细粉、双峰α-Al2O3微粉、单峰α-Al2O3微粉、96硅微粉及减水剂加入圆锥式预混机内，预混30分钟，制得预混粉；
3)按质量百分比进行配料，先向混料机内加入板状刚玉骨料、防爆纤维和耐热不锈钢纤维混炼2分钟，再向混料机内加入步骤2)制备的预混粉混炼6分钟后出料即可。
本发明具有以下优点：
1)ρ-Al2O3是一种能在常温下和水发生水化反应，生成具有胶结性质的水化产物使材料产生强度。在高温下，ρ-Al2O3水化物可以转变成为具有良好高温性能的α-Al2O3，并且ρ-Al2O3是一种纯净的氧化物体系，它可以有效地避免铝酸钙水泥结合浇注料由于含CaO使材料中高温强度降低的问题，同时结合剂ρ-Al2O3在高温下会转化为α-Al2O3，不会向浇注料内引入杂质，不会降低浇注料的高温性能，并且转化成的α-Al2O3活性很高，能够促进浇注料的烧成；
2)电熔镁砂的加入可以原位生成尖晶石产生微膨胀，降低浸渍管钢结构和浇注料膨胀膨胀系数不匹配而产生的机械应力，减少使用过程浇注料的开裂。并且由于尖晶石的生成，使得晶体结构出现少量微裂纹，改善了浇注料的热震稳定性能；
3)双峰α-Al2O3微粉、单峰α-Al2O3微粉复合添加不仅增加了基质的填充性，减少了加水量，降低了浇注料的气孔率，还具有一定的促烧性，提高了浇注料的抗侵蚀性能；
4)添加96硅微粉改善浇注料基质填充及烧结性能；
5)添加耐热不锈钢纤维，能够提高产品热震稳定性能及中温强度。
具体实施方式
为使本发明实施方式的目的、技术方案和优点更加清楚，下面将结合具体实施方式中的技术方案进行清楚、完整地描述。
实施例1，按照如下原料进行配比，做成4组测试，
将T1、T2、T3、T4标号的4组试样经干料混料、加水搅拌、浇注成型、脱模养护、于110℃烘烤24h、1500℃温度下保温3h分别烧成后，并对其进行检测，检测结果见下表，
根据检测结果可以看出，随着ρ-Al2O3加入量的增加，加水量也在不断增加，试样110℃烘烤后的常温抗折强度不断增加，但是随着气孔率的增加，试样1550℃*3h烧后抗折强度呈现出先增加再降低的趋势。故4％结合剂ρ-Al2O3的加入比例为综合考虑气孔率和1550℃*3h烧后常温抗折强度下的浇注料最优比例。
实施例2，按照如下原料进行配比，做成3组测试，
将F1、F2、F3标号的3组试样经过与实施例1相同工艺后烧成后，并对其进行检测，检测结果见下表，
根据检测结果可以看出，双峰α-Al2O3微粉和单峰α-Al2O3微粉复合添加可以促进刚玉尖晶石浇注料基质填充，降低了试样的气孔率，提高了试样的抗折强度，同时双峰α-Al2O3微粉、单峰α-Al2O3微粉比例各占所述α-Al2O3微粉50％时，具有最低的气孔率和较大的抗折强度。
实施例3、按照如下原料进行配比，做成3组测试，
1)先将块状电熔镁砂制成粒度为0.088mm的细粉；
2)将电熔镁砂细粉、双峰α-Al2O3微粉、单峰α-Al2O3微粉、96硅微粉及减水剂加入圆锥式预混机内，预混30分钟，制得预混粉；
3)然后向混料机内加入0-1mm、1-3mm、3-5mm、5-7mm板状刚玉骨料、防爆纤维和耐热不锈钢纤维混炼2分钟，再向混料机内加入步骤2)制备的预混粉混炼6分钟后出料；
4)将干料粉加水搅拌、浇注成型、脱模养护、于110℃烘烤24h、1500℃温度下保温3h分别烧成后，并对其进行检测，结果如下，
实验结果表明，加入一定比例的电熔镁砂不仅可以原位生成尖晶石来产生微膨胀，减少使用过程产生的裂缝，还可以提高产品的热震稳定性能，但是随着电熔镁砂细粉加入量的持续增加，试样1550℃*3h烧后线变化率也在不断增加，试样的晶体结构不断遭到破坏，试样1550℃*3h烧后抗折强度不断降低，特别的，6％电熔镁砂细粉为最佳加入量。
Claims (8)
1.一种RH炉浸渍管用浇注料，其特征在于，包括板状刚玉、α-Al2O3微粉、ρ-Al2O3、96硅微粉、减水剂、防爆纤维、耐热不锈钢纤维。
2.根据权利要求1所述的一种RH炉浸渍管用浇注料，其特征在于，按质量百分数记，板状刚玉82.12％、α-Al2O3微粉10％、ρ-Al2O34％、96硅微粉0.5％、减水剂0.8％、防爆纤维0.08％、耐热不锈钢纤维2.5％。
3.根据权利要求1所述的一种RH炉浸渍管用浇注料，其特征在于，包括板状刚玉、α-Al2O3微粉、ρ-Al2O3、96硅微粉、减水剂、防爆纤维、耐热不锈钢纤维、电熔镁砂细粉。
4.根据权利要求3所述的一种RH炉浸渍管用浇注料，其特征在于，包括板状刚玉76.12％、α-Al2O3微粉10％、ρ-Al2O34％、96硅微粉0.5％、减水剂0.8％、防爆纤维0.08％、耐热不锈钢纤维2.5％、电熔镁砂细粉6％。
5.根据权利要求1至4所述的任一种RH炉浸渍管用浇注料，其特征在于，所述α-Al2O3微粉包括双峰α-Al2O3微粉、单峰α-Al2O3微粉。
6.根据权利要求5所述的一种RH炉浸渍管用浇注料，其特征在于，所述双峰α-Al2O3微粉、单峰α-Al2O3微粉比例各占所述α-Al2O3微粉50％。
7.根据权利要求3或4所述的一种RH炉浸渍管用浇注料，其特征在于，所述电熔镁砂细粉粒度为0.088mm。
8.一种RH炉浸渍管用浇注料的制备方法，其特征在于，包括如下步骤，
1)将块状电熔镁砂制成粒度为0.088mm的细粉；
2)按质量百分比进行配料，将电熔镁砂细粉、双峰α-Al2O3微粉、单峰α-Al2O3微粉、96硅微粉及减水剂加入圆锥式预混机内，预混30分钟，制得预混粉；
3)按质量百分比进行配料，先向混料机内加入板状刚玉骨料、防爆纤维和耐热不锈钢纤维混炼2分钟，再向混料机内加入步骤2)制备的预混粉混炼6分钟后出料即可。
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