CN115093205A - 一种水泥回转窑口用耐火材料 - Google Patents

一种水泥回转窑口用耐火材料 Download PDF

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CN115093205A
CN115093205A CN202210492710.5A CN202210492710A CN115093205A CN 115093205 A CN115093205 A CN 115093205A CN 202210492710 A CN202210492710 A CN 202210492710A CN 115093205 A CN115093205 A CN 115093205A
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董舜杰
阮和平
蒋杰
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Anhui Ruitai New Material Technology Co ltd
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Abstract

本发明公开了一种水泥回转窑口用耐火材料，其原料按重量份包括：骨料70‑75份、锆莫来石细粉15‑18份、耐热钢纤维3.5‑4份、硅细粉3.5‑4份、粘合剂3‑4份，其中，骨料包括：铝矾土骨料、锆莫来石骨料、改性空心氧化铝。本发明通过各原料相互配合，使得本发明具有较低的导热性能，能避免热量的流失，并且具有良好的抗侵蚀性能，提高其作为水泥回转窑口用料的使用寿命。

Description

一种水泥回转窑口用耐火材料
技术领域
本发明涉及水泥窑材料技术领域，尤其涉及一种水泥回转窑口用耐火材料。
背景技术
窑口是新型干法水泥回转窑的薄弱环节。随着窑内燃烧技术的发展和窑头密封性能的提升，新型干法水泥回转窑窑口处的温度也同步提高(达到1400℃)，水泥熟料和高速气流经过窑口进入冷却机，每次开停窑会使窑口部位的温度发生急剧变化，窑内的碱性挥发物等在窑口部位富集，这些恶劣的工况条件，造成窑口部位所用的耐火材料经常损坏，它的寿命是最短的。
且新型干法水泥窑采用余热来预热生料，通过降低回转窑耐火材料导热系数来减少回转窑筒体散热的方式成为新型干法水泥回转窑节能的首选措施。目前常采用轻量耐火材料来达到保温隔热、节能降耗的目的。但是轻量耐火材料的抗侵蚀性能较低，而水泥回转窑口对耐火材料的抗侵蚀性能要求更高。
发明内容
基于背景技术存在的技术问题，本发明提出了一种水泥回转窑口用耐火材料，本发明通过各原料相互配合，使得本发明具有较低的导热性能，能避免热量的流失，并且具有良好的抗侵蚀性能，提高其作为水泥回转窑口用料的使用寿命。
本发明提出了一种水泥回转窑口用耐火材料，其原料按重量份包括：骨料70-75份、锆莫来石细粉15-18份、耐热钢纤维3.5-4份、硅细粉3.5-4份、粘合剂3-4份，其中，骨料包括：铝矾土骨料、锆莫来石骨料、改性空心氧化铝。
本发明通过加入锆莫来石骨料、改性空心氧化铝、锆莫来石细粉，并调节其配比，从而降低耐火材料的导热性能。
优选地，在改性空心氧化铝的制备过程中，将空心氧化铝、红柱石细粉、硅溶胶混匀，固液分离，烘干得到改性空心氧化铝。
优选地，空心氧化铝、红柱石细粉、硅溶胶的重量比为1:0.3-0.4:0.6-0.7。
优选地，硅溶胶的质量分数为20-30wt％。
本发明通过在空心氧化铝表面包覆红柱石细粉、硅溶胶，一方面空心氧化铝的引入，可以与锆莫来石相互配合降低耐火材料的导热性能；另一方面通过红柱石细粉、硅溶胶的配合，可以降低耐火材料的孔径，阻止碱性蒸气向耐火材料内部渗透，避免膨胀开裂现象的产生，提高材料的抗侵蚀性能；并且能促进各原料(铝矾土、锆莫来石、氧化铝、耐热钢纤维)相互融合，形成良好的界面结构，提高耐火材料的机械性能；硅细粉可以进一步降低耐火材料的孔径，提高抗侵蚀性能；耐热钢纤维可以进一步提高本发明的机械性能。
优选地，铝矾土骨料、锆莫来石骨料、改性空心氧化铝的重量比为7.5-8:1-1.5:1。
优选地，改性空心氧化铝、锆莫来石骨料的粒径均＜1mm。
优选地，铝矾土骨料的粒径为5-3mm、3-1mm和＜1mm。
优选地，粒径为5-3mm的铝矾土骨料、粒径为3-1mm铝矾土骨料、粒径＜1mm的铝矾土骨料的重量比为3.5:3.5:0.5-1。
本发明通过筛选各骨料的粒径和配比，进一步提高耐火材料的机械性能。
优选地，锆莫来石细粉的粒径为180-200目。
优选地，粘合剂为磷酸二氢铝。
有益效果：
本发明通过加入锆莫来石骨料、改性空心氧化铝、锆莫来石细粉，并调节其配比，从而降低耐火材料的导热性能；
本发明通过在空心氧化铝表面包覆红柱石细粉、硅溶胶，一方面空心氧化铝的引入，可以降低耐火材料的导热性能；另一方面通过红柱石细粉、硅溶胶的配合，可以降低耐火材料的孔径，阻止碱性蒸气向耐火材料内部渗透，避免膨胀开裂现象的产生，提高材料的抗侵蚀性能；并且能促进各原料(铝矾土、锆莫来石、氧化铝、耐热钢纤维)相互融合，形成良好的界面结构，提高耐火材料的机械性能；硅细粉可以进一步降低耐火材料的孔径，提高抗侵蚀性能；耐热钢纤维可以进一步提高本发明的机械性能；本发明通过筛选各骨料的粒径和配比，进一步提高耐火材料的机械性能。
具体实施方式
下面，通过具体实施例对本发明的技术方案进行详细说明，但是应该明确提出这些实施例用于举例说明，但是不解释为限制本发明的范围。
实施例1
一种水泥回转窑口用耐火材料，其原料按重量份包括：粒径为5-3mm的铝矾土骨料24.5g、粒径为3-1mm铝矾土骨料24.5g、粒径＜1mm的铝矾土骨料3.5g、粒径＜1mm的锆莫来石骨料10.5g、粒径＜1mm的改性空心氧化铝7g、粒径为180目的锆莫来石细粉18g、耐热钢纤维4g、硅细粉4g、磷酸二氢铝4g；
其中，在改性空心氧化铝的制备过程中，将空心氧化铝、红柱石细粉、质量分数为20wt％硅溶胶混匀，以150r/min的速度搅拌40min，过滤，取滤饼，于40℃烘干得到改性空心氧化铝，其中，空心氧化铝、红柱石细粉、硅溶胶的重量比为1:0.4:0.6。
实施例2
一种水泥回转窑口用耐火材料，其原料按重量份包括：粒径为5-3mm的铝矾土骨料26.25g、粒径为3-1mm铝矾土骨料26.25g、粒径＜1mm的铝矾土骨料7.5g、粒径＜1mm的锆莫来石骨料7.5g、粒径＜1mm的改性空心氧化铝7.5g、粒径为200目的锆莫来石细粉15g、耐热钢纤维3.5g、硅细粉3.5g、磷酸二氢铝3g；
其中，在改性空心氧化铝的制备过程中，将空心氧化铝、红柱石细粉、质量分数为30wt％硅溶胶混匀，以150r/min的速度搅拌40min，过滤，取滤饼，于40℃烘干得到改性空心氧化铝，其中，空心氧化铝、红柱石细粉、硅溶胶的重量比为1:0.3:0.7。
实施例3
一种水泥回转窑口用耐火材料，其原料按重量份包括：粒径为5-3mm的铝矾土骨料25.2g、粒径为3-1mm铝矾土骨料25.2g、粒径＜1mm的铝矾土骨料7.2g、粒径＜1mm的锆莫来石骨料7.2g、粒径＜1mm的改性空心氧化铝7.2g、粒径为180-200目的锆莫来石细粉17g、耐热钢纤维3.75g、硅细粉3.75g、磷酸二氢铝3.5g；
其中，在改性空心氧化铝的制备过程中，将空心氧化铝、红柱石细粉、质量分数为20-30wt％硅溶胶混匀，以150r/min的速度搅拌40min，过滤，取滤饼，于40℃烘干得到改性空心氧化铝，其中，空心氧化铝、红柱石细粉、硅溶胶的重量比为1:0.35:0.65。
对比例1
将“粒径＜1mm的改性空心氧化铝”替换成“粒径＜1mm的空心氧化铝”，其他同实施例3。
对比例2
在改性空心氧化铝的制备过程中，不添加红柱石细粉，其他同实施例3。
对比例3
在改性空心氧化铝的制备过程中，不添加硅溶胶，其他同实施例3。
对比例4
将“粒径＜1mm的锆莫来石骨料”替换成“粒径＜1mm的铝矾土骨料”，将“粒径为180-200目的锆莫来石细粉”替换成“粒径为180-200目的铝矾土细粉”其他同实施例3。
上述实施例1-3和对比例1-4的制备方法相同，均包括如下步骤：按照配方称取各原料混匀，然后加水搅拌均匀，倒入模具中，震实、静置、脱模得到坯料；于110℃加热干燥坯料，然后于1550℃烧结5h制得。
对实施例1-3和对比例1-2制得耐火材料进行性能检测，结果如表1所示。
参照GB/T5072-2008检测试样的常温耐压强度；参照GB/T14983-2008检测试样的抗碱性能。
表1检测结果
Figure BDA0003632331410000051
由表1可以看出本发明具有较低的导热系数、良好的抗侵蚀性能和耐压强度。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。

Claims (10)

1.一种水泥回转窑口用耐火材料，其特征在于，其原料按重量份包括：骨料70-75份、锆莫来石细粉15-18份、耐热钢纤维3.5-4份、硅细粉3.5-4份、粘合剂3-4份，其中，骨料包括：铝矾土骨料、锆莫来石骨料、改性空心氧化铝。
2.根据权利要求1所述水泥回转窑口用耐火材料，其特征在于，在改性空心氧化铝的制备过程中，将空心氧化铝、红柱石细粉、硅溶胶混匀，固液分离，烘干得到改性空心氧化铝。
3.根据权利要求2所述水泥回转窑口用耐火材料，其特征在于，空心氧化铝、红柱石细粉、硅溶胶的重量比为1:0.3-0.4:0.6-0.7。
4.根据权利要求2或3所述水泥回转窑口用耐火材料，其特征在于，硅溶胶的质量分数为20-30wt％。
5.根据权利要求1-4任一项所述水泥回转窑口用耐火材料，其特征在于，铝矾土骨料、锆莫来石骨料、改性空心氧化铝的重量比为7.5-8:1-1.5:1。
6.根据权利要求1-5任一项所述水泥回转窑口用耐火材料，其特征在于，改性空心氧化铝、锆莫来石骨料的粒径均＜1mm。
7.根据权利要求1-6任一项所述水泥回转窑口用耐火材料，其特征在于，铝矾土骨料的粒径为5-3mm、3-1mm和＜1mm。
8.根据权利要求7所述水泥回转窑口用耐火材料，其特征在于，粒径为5-3mm的铝矾土骨料、粒径为3-1mm铝矾土骨料、粒径＜1mm的铝矾土骨料的重量比为3.5:3.5:0.5-1。
9.根据权利要求1-8任一项所述水泥回转窑口用耐火材料，其特征在于，锆莫来石细粉的粒径为180-200目。
10.根据权利要求1-9任一项所述水泥回转窑口用耐火材料，其特征在于，粘合剂为磷酸二氢铝。
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