CN107759214A - 一种高热震稳定性镁尖晶石砖及其制备方法 - Google Patents
一种高热震稳定性镁尖晶石砖及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种高热震稳定性镁尖晶石砖及其制备方法,该制备方法包括:1)将镁铝尖晶石、氧化锆、聚乙烯吡咯烷酮、硼酸铝晶须进行球磨以制得球磨组合物;2)将高岭土、绿泥石、铝矿渣、碳化硼、硫酸硅、石英砂、球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水进行混合、陈化以制得混合料;3)将混合料进行压制以制得砖坯;4)将砖坯进行干燥、烧制、冷却以制得高热震稳定性镁尖晶石砖。该耐火砖具有优异的热震稳定性。
Description
技术领域
本发明涉及耐火砖,具体地,涉及一种高热震稳定性镁尖晶石砖及其制备方法。
背景技术
水泥回转窑经历了漫长的演变和发展过程,目前水泥工业窑炉主要由窑口、下过渡带、烧成带、下过渡带和安全带组成;由于烧成带和过渡带的工作环境较为恶劣,故而需要在烧成带和过渡带的窑壁上设置耐火砖。理想中的耐火砖需要具有以下特点:1)优异的挂窑皮性能;2)高抗热化学反应能力;3)优异的抗渣能力;4)优异的机械强度;5)优异的热震稳定性。但是现有的耐火砖的热震稳定性较差,容易开裂进而极大地影响了其使用寿命。
发明内容
本发明的目的是提供一种高热震稳定性镁尖晶石砖及其制备方法,该耐火砖具有优异的热震稳定性,同时该制备方法具有工序简单和原料易得的优点。
为了实现上述目的,本发明提供了一种高热震稳定性镁尖晶石砖的制备方法,该制备方法包括:
1)将镁铝尖晶石、氧化锆、聚乙烯吡咯烷酮、硼酸铝晶须进行球磨以制得球磨组合物;
2)将高岭土、绿泥石、铝矿渣、碳化硼、硫酸硅、石英砂、球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水进行混合、陈化以制得混合料;
3)将混合料进行压制以制得砖坯;
4)将砖坯进行干燥、烧制、冷却以制得高热震稳定性镁尖晶石砖;
其中,镁铝尖晶石由平均粒径为0.06-0.08mm的颗粒A、平均粒径为0.15-0.25mm的颗粒B和平均粒径为1.5-2.2mm的颗粒C按照10:15-35:6-10的重量比组成。
本发明还提供了一种高热震稳定性镁尖晶石砖,该高热震稳定性镁尖晶石砖通过上的制备方法制备而得。
在上述技术方案,本发明通过各原料和各工序的有机结合使得制得的耐火砖具有优异的热震稳定性,同时该制备方法具有工序简单和原料易得的优点。
本发明的其他特征和优点将在随后的具体实施方式部分予以详细说明。
具体实施方式
以下对本发明的具体实施方式进行详细说明。应当理解的是,此处所描述的具体实施方式仅用于说明和解释本发明,并不用于限制本发明。
本发明提供了一种高热震稳定性镁尖晶石砖的制备方法,该制备方法包括:
1)将镁铝尖晶石、氧化锆、聚乙烯吡咯烷酮、硼酸铝晶须进行球磨以制得球磨组合物;
2)将高岭土、绿泥石、铝矿渣、碳化硼、硫酸硅、石英砂、球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水进行混合、陈化以制得混合料;
3)将混合料进行压制以制得砖坯;
4)将砖坯进行干燥、烧制、冷却以制得高热震稳定性镁尖晶石砖;
其中,镁铝尖晶石由平均粒径为0.06-0.08mm的颗粒A、平均粒径为0.15-0.25mm的颗粒B和平均粒径为1.5-2.2mm的颗粒C按照10:15-35:6-10的重量比组成。
在本发明的步骤1)中,各物料的粒径可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤1)中,所述镁铝尖晶石的平均粒径为0.11-0.18mm,所述硼酸铝晶须的平均长度为30-50μm。
在本发明的步骤1)中,各物料的用量可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤1)中,镁铝尖晶石、氧化锆、聚乙烯吡咯烷酮、硼酸铝晶须的重量比为10:5-6.5:3-4:1-3。
在本发明的步骤1)中,球磨的具体条件可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,球磨满足以下条件:大球与小球的质量比为4:2-2.5,磨球与物料的质量比为5:1.5-2,转速为2000-2500rpm,球磨时间为45-60min。
在本发明的步骤2)中,各物料的用量可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤2)中,高岭土、绿泥石、铝矿渣、碳化硼、硫酸硅、石英砂、球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水的重量比为10:5-7:2.1-2.6:0.2-0.6:5-8:2-7:8-12:2-4:3-5:3-6:30-50。
在本发明的步骤2)中,混合的条件可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤2)中,混合满足以下条件:混合温度为30-40℃,混合时间为40-60min。
在本发明的步骤2)中,陈化的条件可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤2)中,陈化满足以下条件:陈化温度为45-60℃,陈化时间为10-20h。
在本发明的步骤2)中,各物料的粒径可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤2)中,高岭土、绿泥石、铝矿渣的平均粒径各自独立地为1.1-1.5mm,碳化硼、硫酸硅、石英砂的平均粒径各自独立地为2.5-3mm。
在本发明的步骤3)中,压制的条件可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤3)中,压制的过程为:先将混合料于20-25MPa下压制20-30min,接着于40-60MPa下压制40-60min,最后于10-15MPa下压制10-15min。
在本发明的步骤3)中,干燥的条件可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤4)中,干燥满足以下条件:干燥温度为125-140℃,干燥时间为30-40h。
在本发明的步骤4)中,烧制的条件可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,在步骤4)中,烧制为:先自15-35℃以0.5-1℃/min升温至320-350℃并保温1-2h,接着以2-2.4℃/min升温至1350-1400℃并保温3-5h,最后以1-1.5℃/min升温至1680-1750℃并保温1-2h。
在本发明的步骤4)中,冷却的方式可以在宽的范围内选择,但是为了使得制得的耐火砖具有更优异的热震稳定性,优选地,冷却采用自然冷却的方式进行。
本发明还提供了一种高热震稳定性镁尖晶石砖,该高热震稳定性镁尖晶石砖通过上的制备方法制备而得。
以下将通过实施例对本发明进行详细描述。
实施例1
1)将镁铝尖晶石、氧化锆(平均粒径为0.15mm)聚乙烯吡咯烷酮、硼酸铝晶须(平均长度为40μm)按照10:5.5:3.5:2的重量比进行球磨以制得球磨组合物;
2)将高岭土(平均粒径为1.3mm)、绿泥石(平均粒径为1.3mm)、铝矿渣(平均粒径为1.4mm)、碳化硼(平均粒径为2.8mm)、硫酸硅(平均粒径为2.7mm)、石英砂(平均粒径为2.9mm)、所述球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水按照10:6:2.4:0.5:6:4:10:3:4:5:40的重量比进行混合(混合温度为35℃,混合时间为50min)、陈化(陈化温度为50℃,陈化时间为15h)以制得混合料;
3)将所述混合料先于23MPa下压制25min,接着于50MPa下压制50min,最后于13MPa下压制13min进行压制以制得砖坯;
4)将所述砖坯进行干燥(干燥温度为130℃,干燥时间为35h)、烧制;接着将干燥后的砖坯先自25℃以0.8℃/min升温至330℃并保温1.5h,再以2.2℃/min升温至1380℃并保温4h,然后以1.3℃/min升温至1700℃并保温1.5h;最后冷却采用以制得所述高热震稳定性镁尖晶石砖A1;
其中,所述镁铝尖晶石由平均粒径为0.07mm的颗粒A、平均粒径为0.20mm的颗粒B和平均粒径为1.8mm的颗粒C按照10:25:8的重量比组成。
实施例2
1)将镁铝尖晶石、氧化锆(平均粒径为0.11mm)聚乙烯吡咯烷酮、硼酸铝晶须(平均长度为30μm)按照10:5:3:1的重量比进行球磨以制得球磨组合物;
2)将高岭土(平均粒径为1.1mm)、绿泥石(平均粒径为1.1mm)、铝矿渣(平均粒径为1.1mm)、碳化硼(平均粒径为2.5mm)、硫酸硅(平均粒径为2.5mm)、石英砂(平均粒径为2.5mm)、所述球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水按照10:5:2.1:0.2:5:2:8:2:3:3:30的重量比进行混合(混合温度为30℃,混合时间为40min)、陈化(陈化温度为45℃,陈化时间为10h)以制得混合料;
3)将所述混合料先于20MPa下压制20min,接着于40MPa下压制40min,最后于10MPa下压制10min进行压制以制得砖坯;
4)将所述砖坯进行干燥(干燥温度为125℃,干燥时间为30h)、烧制;接着将干燥后的砖坯先自15℃以0.5℃/min升温至320℃并保温1h,再以2℃/min升温至1350℃并保温3h,然后以1℃/min升温至1680℃并保温1h;最后冷却采用以制得所述高热震稳定性镁尖晶石砖A2;
其中,所述镁铝尖晶石由平均粒径为0.06mm的颗粒A、平均粒径为0.15mm的颗粒B和平均粒径为1.5mm的颗粒C按照10:15:6的重量比组成。
实施例3
1)将镁铝尖晶石、氧化锆(平均粒径为0.18mm)聚乙烯吡咯烷酮、硼酸铝晶须(平均长度为50μm)按照10:6.5:4:3的重量比进行球磨以制得球磨组合物;
2)将高岭土(平均粒径为1.5mm)、绿泥石(平均粒径为1.5mm)、铝矿渣(平均粒径为1.5mm)、碳化硼(平均粒径为3mm)、硫酸硅(平均粒径为3mm)、石英砂(平均粒径为3mm)、所述球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水按照10:7:2.6:0.6:8:7:12:4:5:6:50的重量比进行混合(混合温度为40℃,混合时间为60min)、陈化(陈化温度为60℃,陈化时间为20h)以制得混合料;
3)将所述混合料先于25MPa下压制30min,接着于60MPa下压制60min,最后于15MPa下压制15min进行压制以制得砖坯;
4)将所述砖坯进行干燥(干燥温度为140℃,干燥时间为40h)、烧制;接着将干燥后的砖坯先自35℃以1℃/min升温至350℃并保温2h,再以2.4℃/min升温至1400℃并保温5h,然后以1.5℃/min升温至1750℃并保温2h;最后冷却采用以制得所述高热震稳定性镁尖晶石砖A3;
其中,所述镁铝尖晶石由平均粒径为0.08mm的颗粒A、平均粒径为0.25mm的颗粒B和平均粒径为2.2mm的颗粒C按照10:35:10的重量比组成。
对比例1
按照实施例1的方法进行制得镁尖晶石砖B1,不同的是,步骤1)未进行球磨工序。
对比例2
按照实施例1的方法进行制得镁尖晶石砖B2,不同的是,步骤1)未使用镁铝尖晶石。
对比例3
按照实施例1的方法进行制得镁尖晶石砖B3,不同的是,步骤1)未使用氧化锆。
对比例4
按照实施例1的方法进行制得镁尖晶石砖B4,不同的是,步骤1)未使用硼酸铝晶须。
检测例1
按照YB/T 376.1-1995记载的方法将镁尖晶石砖升至1100℃后,水冷,反复测试直至材料产生宏观裂纹,然后记录水冷的次数;具体结果见表1。
表1
镁尖晶石砖 | A1 | A2 | A3 | B1 | B2 | B3 | B4 |
水冷的次数/次 | 14 | 17 | 16 | 5 | 10 | 12 | 7 |
以上详细描述了本发明的优选实施方式,但是,本发明并不限于上述实施方式中的具体细节,在本发明的技术构思范围内,可以对本发明的技术方案进行多种简单变型,这些简单变型均属于本发明的保护范围。
另外需要说明的是,在上述具体实施方式中所描述的各个具体技术特征,在不矛盾的情况下,可以通过任何合适的方式进行组合,为了避免不必要的重复,本发明对各种可能的组合方式不再另行说明。
此外,本发明的各种不同的实施方式之间也可以进行任意组合,只要其不违背本发明的思想,其同样应当视为本发明所公开的内容。
Claims (10)
1.一种高热震稳定性镁尖晶石砖的制备方法,其特征在于,所述制备方法包括:
1)将镁铝尖晶石、氧化锆、聚乙烯吡咯烷酮、硼酸铝晶须进行球磨以制得球磨组合物;
2)将高岭土、绿泥石、铝矿渣、碳化硼、硫酸硅、石英砂、所述球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水进行混合、陈化以制得混合料;
3)将所述混合料进行压制以制得砖坯;
4)将所述砖坯进行干燥、烧制、冷却以制得所述高热震稳定性镁尖晶石砖;
其中,所述氧化锆由平均粒径为15-20nm的颗粒A、平均粒径为35-50nm的颗粒B和平均粒径为65-70mm的颗粒C按照10:15-35:6-10的重量比组成。
2.根据权利要求1所述的制备方法,其中,在步骤1)中,所述镁铝尖晶石、氧化锆、聚乙烯吡咯烷酮、硼酸铝晶须的重量比为10:5-6.5:3-4:1-3;
优选地,所述镁铝尖晶石的平均粒径为0.11-0.18mm,所述硼酸铝晶须的平均长度为30-50μm;
更优选地,所述球磨满足以下条件:大球与小球的质量比为4:2-2.5,磨球与物料的质量比为5:1.5-2,转速为2000-2500rpm,球磨时间为45-60min。
3.根据权利要求1或2所述的制备方法,其中,在步骤2)中,所述高岭土、绿泥石、铝矿渣、碳化硼、硫酸硅、石英砂、所述球磨组合物、木质素磺酸钙、硅酸钠、环糊精和水的重量比为10:5-7:2.1-2.6:0.2-0.6:5-8:2-7:8-12:2-4:3-5:3-6:30-50。
4.根据权利要求3所述的制备方法,其中,在步骤2)中,所述混合满足以下条件:混合温度为30-40℃,混合时间为40-60min。
5.根据权利要求3所述的制备方法,其中,在步骤2)中,所述陈化满足以下条件:陈化温度为45-60℃,陈化时间为10-20h。
6.根据权利要求3所述的制备方法,其中,在步骤2)中,所述高岭土、绿泥石、铝矿渣的平均粒径各自独立地为1.1-1.5mm,所述碳化硼、硫酸硅、石英砂的平均粒径各自独立地为2.5-3mm。
7.根据权利要求1-2、4-6中任意一项所述的制备方法,其中,在步骤3)中,所述压制的过程为:先将所述混合料于20-25MPa下压制20-30min,接着于40-60MPa下压制40-60min,最后于10-15MPa下压制10-15min。
8.根据权利要求7所述的制备方法,其中,在步骤4)中,所述干燥满足以下条件:干燥温度为125-140℃,干燥时间为30-40h。
9.根据权利要求7所述的制备方法,其中,在步骤4)中,所述烧制为:先自15-35℃以0.5-1℃/min升温至320-350℃并保温1-2h,接着以2-2.4℃/min升温至1350-1400℃并保温3-5h,最后以1-1.5℃/min升温至1680-1750℃并保温1-2h;
优选地,所述冷却采用自然冷却的方式进行。
10.一种高热震稳定性镁尖晶石砖,其特征在于,所述高热震稳定性镁尖晶石砖通过权利要求1-9中任意一项所述的制备方法制备而得。
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