CN111792939A - 一种高铝拉砖及其制备方法 - Google Patents
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Abstract
本发明提供一种高铝拉砖及其制备方法。所述高铝拉砖由以下重量百分比的原料制成:ɑ‑Al2O3颗粒33~37%、红柱石颗粒18~22%、红柱石粉13~17%、蓝晶石粉5~9%、高铝粉8~12%、结合剂12~15%。制备方法包括以下步骤:(1)ɑ‑Al2O3及红柱石粉碎;(2)红柱石粉、蓝晶石粉、高铝粉混合,研磨成细度≤0.088mm的共磨粉;(3)混料;(4)混料中加结合剂,混炼料(5)制砖坯;(6)将砖坯90~180℃烘干、入窑烧结,1480℃烧结,即得成品。本发明的高铝拉砖,蠕变率低、荷重软化点高、高温抗折强度高、外形尺寸变形小且寿命长,能够提高炭素阳极焙烧炉的使用炉龄,降低维修成本。
Description
技术领域
本发明涉及耐火材料技术领域,具体涉及一种供炭素阳极焙烧炉火道用的高铝拉砖及其制备方法。
背景技术
火道是阳极焙烧炉的最重部位,炭素阳极焙烧炉火道墙所使用的耐火砖品种多、形状复杂、技术条件要求高。炭素阳极焙烧炉火道用高铝拉砖是炭素阳极焙烧炉火道墙耐火砖的一种,是一种火道墙拉砖,使用条件苛刻。高铝拉砖的两端在火道墙上砌筑,中间悬空,而火道墙内部为w型气体结构,因此要求高铝拉砖在保证火道整体强度的同时,最大程度降低烟气沿承阻力和局部阻力损失,并使火道内的温差有效降低。
火道拉砖除了承受火道墙的重量外,还直接与高温烟气接触,焙烧最高温度可达1280℃,火井口由于直接与烧嘴喷口火炬接触,局部温度可达1500℃。因为焙烧炉为周期性窑炉,耐材制品在每个周期内都要经过从室温---高温---室温的全过程,这就要求耐材制品必须具备良好的抗热震性及高温蠕变性;同时,为延长焙烧炉的使用寿命和最大限度提高焙烧炉的热效率,还要提高耐材荷重软化温度及抗折抗压强度,
目前,炭素焙烧炉火拉砖大多使用高铝砖,但目现有的高铝砖普遍存在蠕变率高、荷重软化点低、高温抗折强度低和外形尺寸变形大的弊端。
发明内容
本发明的目的在于提供一种高铝拉砖,旨在解决现有技术中的高铝砖蠕变率高、荷重软化点低、高温抗折强度低和外形尺寸变形大的技术问题;同时,本发明的目的还在于提供一种上述高铝拉砖的制备方法。
为实现上述目的,本发明的高铝拉砖采用的技术方案是:所述高铝拉砖,由以下重量百分比的原料制成:由以下重量百分比的原料制成:ɑ-Al2O3颗粒33~37%、红柱石颗粒18~22%、红柱石粉13~17%、蓝晶石粉5~9%、高铝粉8~12%、结合剂12~15%。
优选地,所述高铝拉砖,由以下重量百分比的原料制成:ɑ-Al2O3颗粒35%、红柱石颗粒20%、红柱石粉15%、蓝晶石粉7%、高铝粉10%、结合剂13%。
优选地,所述ɑ-Al2O3颗粒的粒度为1~3mm;红柱石颗粒的粒度为0~1mm,红柱石粉的细度≤0.088mm;蓝晶石粉的细度≤0.088mm、高铝粉的细度≤0.088mm。
优选地,所述结合剂为广西白泥。
上述高铝拉砖的制备方法,包括以下步骤:
(1)将ɑ-Al2O3破碎后筛分成粒度为1~3mm;红柱石破碎后筛分成粒度为0~1mm;
(2)选取上述重量百分比的红柱石粉、蓝晶石粉、高铝粉混合,研磨成细度≤0.088mm的共磨粉;
(3)将共磨粉与上述重量百分比的、粒度为1~3mm的ɑ-Al2O3及粒度为0~1mm的红柱石颗粒混合,制成混合料;
(4)在混合料中加入上述重量的结合剂,制成混炼料;
(5)采用数控压装机,将混炼料压制成密度﹥2.45g/cm3的砖坯;
(6)将砖坯经90~180℃烘干后,装入窑中,1480℃烧结,即得成品。
本发明的有益效果:本发明的高铝拉砖,蠕变率低、荷重软化点高、高温抗折强度高、外形尺寸变形小且寿命长,能够提高炭素阳极焙烧炉的使用炉龄,降低维修成本。
具体实施方式
下面结合具体实施例对本发明作进一步说明。
实施例1:
本实施例的高铝拉砖,由以下重量百分比的原料制成:ɑ-Al2O3颗粒35%、红柱石颗粒20%、红柱石粉15%、蓝晶石粉7%、高铝粉10%、结合剂13%。
本实施例中,ɑ-Al2O3颗粒的粒度为1~3mm;红柱石颗粒的粒度为0~1mm,红柱石粉的细度≤0.088mm;蓝晶石粉的细度≤0.088mm、高铝粉的细度≤0.088mm。
本实施例中,所述结合剂为广西白泥。
本实施例的高铝拉砖的制备方法,包括以下步骤:
(1)将ɑ-Al2O3破碎后筛分成粒度为1~3mm;红柱石破碎后筛分成粒度为0~1mm;
(2)选取上述重量百分比的红柱石粉、蓝晶石粉、高铝粉混合,研磨成细度≤0.088mm的共磨粉;
(3)将共磨粉与上述重量百分比的、粒度为1~3mm的ɑ-Al2O3及粒度为0~1mm的红柱石颗粒混合,制成混合料;
(4)在混合料中加入上述重量的结合剂,制成混炼料;
(5)采用数控压装机,将混炼料压制成密度﹥2.45g/cm3的砖坯;
(6)将砖坯经90~180℃烘干后,装入窑中,1480℃烧结,即得成品。
实施例2:
本实施例的高铝拉砖,由以下重量百分比的原料制成:ɑ-Al2O3颗粒33%、红柱石颗粒22%、红柱石粉13%、蓝晶石粉9%、高铝粉8%、结合剂15%。
本实施例中,ɑ-Al2O3颗粒的粒度为1~3mm;红柱石颗粒的粒度为0~1mm,红柱石粉的细度≤0.088mm;蓝晶石粉的细度≤0.088mm、高铝粉的细度≤0.088mm。
本实施例中,所述结合剂为广西白泥。
本实施例的高铝拉砖的制备方法同实施例1。
实施例3:
本实施例的高铝拉砖,由以下重量百分比的原料制成:ɑ-Al2O3颗粒37%、红柱石颗粒18%、红柱石粉17%、蓝晶石粉5%、高铝粉12%、结合剂12%。
本实施例中,ɑ-Al2O3颗粒的粒度为1~3mm;红柱石颗粒的粒度为0~1mm,红柱石粉的细度≤0.088mm;蓝晶石粉的细度≤0.088mm、高铝粉的细度≤0.088mm。
本实施例中,所述结合剂为广西白泥。
本实施例的高铝拉砖的制备方法同实施例1。
本发明的高铝拉砖的理化参数如下表所示:
由上表可知,本发明的高铝拉砖与特种高铝砖相比,蠕变率低、荷重软化点高、高温抗折强度高、外形尺寸变形小且寿命长,能够提高炭素阳极焙烧炉的使用炉龄,降低维修成本。
最后需要说明的是:以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的宗旨和范围,其均应涵盖在本发明的权利要求的范围当中。
Claims (5)
1.一种高铝拉砖,其特征在于,由以下重量百分比的原料制成:ɑ-Al2O3颗粒33~37%、红柱石颗粒18~22%、红柱石粉13~17%、蓝晶石粉5~9%、高铝粉8~12%、结合剂12~15%。
2.根据权利要求1所述的高铝拉砖,其特征在于:由以下重量百分比的原料制成:ɑ-Al2O3颗粒35%、红柱石颗粒20%、红柱石粉15%、蓝晶石粉7%、高铝粉10%、结合剂13%。
3.根据权利要求1或2所述的高铝拉砖,其特征在于:所述ɑ-Al2O3颗粒的粒度为1~3mm;红柱石颗粒的粒度为0~1mm,红柱石粉的细度≤0.088mm;蓝晶石粉的细度≤0.088mm、高铝粉的细度≤0.088mm。
4.根据权利要求1或2所述的碳素炉用低蠕变粘土耐火砖,其特征在于:所述结合剂为广西白泥。
5.一种如权利要求1-4任一项所述的高铝拉砖的制备方法,其特征在于,包括以下步骤:
(1)将ɑ-Al2O3破碎后筛分成粒度为1~3mm;红柱石破碎后筛分成粒度为0~1mm;
(2)选取上述重量百分比的红柱石粉、蓝晶石粉、高铝粉混合,研磨成细度≤0.088mm的共磨粉;
(3)将共磨粉与上述重量百分比的、粒度为1~3mm的ɑ-Al2O3及粒度为0~1mm的红柱石颗粒混合,制成混合料;
(4)在混合料中加入上述重量的结合剂,制成混炼料;
(5)采用数控压装机,将混炼料压制成密度﹥2.45g/cm3的砖坯;
(6)将砖坯经90~180℃烘干后,装入窑中,1480℃烧结,即得成品。
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