CN111763076A - 一种rh插入管用无铬不烧砖及制备方法 - Google Patents
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Abstract
本发明涉及一种RH插入管用无铬不烧砖及制备方法,包括以下重量份原料:1mm<粒度≤3mm的98电熔镁铝尖晶石10‑15份;0<粒度≤1mm的98电熔镁砂25‑30份;1mm<粒度≤3mm的98电熔镁砂15‑20份;3mm<粒度≤5mm的98电熔镁砂10‑15份;98电熔镁砂200目细粉20‑25份;板状刚玉超微粉3‑5份;铝粉1‑1.5份;硅粉1‑1.5份;活性脱硅锆超微粉2‑4份;二氧化钛1‑3份;结合剂2‑4份。优点是:不添加含铬原料有效的解决六价铬对环境和人体本身的危害,同时,保证了RH插入管用不烧砖的耐高温、耐磨损、抗剥落、抗热震性能,延长了RH插入管的使用寿命。
Description
技术领域
本发明涉及一种RH插入管用无铬不烧砖及制备方法。
背景技术
钢铁的炉外精炼技术中最为重要的设备之一是RH精炼炉,它是对钢水采用真空的方法进行二次精炼,能够提升钢水质量同时降低工业成本。而RH精炼炉最为重要的耐材部位就是浸渍管,也就是插入管。现用RH插入管耐材一般采用高档烧成致密镁铬砖。镁铬质耐火材料具有一定的优异性能,但在生产过程中所产生的六价铬对环境和人体本身都存在危害,因此亟待开发一种无铬质耐火材料去替代现有的含铬耐火材料。
发明内容
为克服现有技术的不足,本发明的目的是提供一种RH插入管用无铬不烧砖及制备方法,有效的解决六价铬对环境和人体本身的危害,该不烧砖具有耐高温、耐磨损、抗剥落、抗热震、具有较长的使用寿命,进而延长RH插入管的使用寿命。用不烧砖代替烧成镁铬砖,降低生产成本,减少环境和人体本身的危害的性能。
为实现上述目的,本发明通过以下技术方案实现:
一种RH插入管用无铬不烧砖,包括以下重量份原料:
1mm<粒度≤3mm的98电熔镁铝尖晶石10-15份;0<粒度≤1mm的98电熔镁砂25-30份;1mm<粒度≤3mm的98电熔镁砂15-20份;3mm<粒度≤5mm的98电熔镁砂10-15份;98电熔镁砂200目细粉20-25份;板状刚玉超微粉3-5份;铝粉1-1.5份;硅粉1-1.5份;活性脱硅锆超微粉2-4份;二氧化钛1-3份;结合剂2-4份。
所述板状刚玉超微粉粒度为325目。
所述结合剂是酚醛树脂。
一种RH插入管用无铬不烧砖的制备方法,包括以下步骤:
1)原料破碎、筛分、细磨:
将98电熔镁砂在破碎机中破碎,筛分为0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm、200目细粉;
2)预混料:
板状刚玉超微粉、铝粉、硅粉、活性脱硅锆超微粉、二氧化钛、一部分0<粒度≤1mm的98电熔镁砂按比例进行预混合;
3)混练:
先将3mm<粒度≤5mm的98电熔镁砂、1mm<粒度≤3mm的98电熔镁砂、剩余的0<粒度≤1mm的98电熔镁砂干混≥3min,然后加入结合剂再混3~5min,加入步骤2)得到的预混料和98电熔镁砂200目细粉,混合搅拌20~25min,然后出料;
4)机压成型:
采用1000吨压砖机成型,成型体密≥3.32g/cm3;
5)热处理:
干燥窑≥200℃,热处理时间≥12h。
与现有技术相比,本发明的有益效果是:
RH插入管用无铬不烧砖不添加含铬原料有效的解决六价铬对环境和人体本身的危害,同时,保证了RH插入管用不烧砖的耐高温、耐磨损、抗剥落、抗热震性能,延长了RH插入管的使用寿命。用不烧砖代替烧成镁铬砖,降低生产成本,减少环境和人体本身的危害的性能。
具体实施方式
下面对本发明进行详细地描述,但是应该指出本发明的实施不限于以下的实施方式。
一种RH插入管用无铬不烧砖,包括以下重量份原料:
1mm<粒度≤3mm的98电熔镁铝尖晶石10-15份;0<粒度≤1mm的98电熔镁砂25-30份;1mm<粒度≤3mm的98电熔镁砂15-20份;3mm<粒度≤5mm的98电熔镁砂10-15份;98电熔镁砂200目细粉20-25份;板状刚玉超微粉3-5份;铝粉1-1.5份;硅粉1-1.5份;活性脱硅锆超微粉2-4份,粒度为325目;二氧化钛1-3份;结合剂2-4份,结合剂是酚醛树脂。
一种RH插入管用无铬不烧砖的制备方法,包括以下步骤:
1)原料破碎、筛分、细磨:
将98电熔镁砂在破碎机中破碎,筛分为0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm、200目细粉;
2)预混料:
板状刚玉超微粉、铝粉、硅粉、活性脱硅锆超微粉、二氧化钛、一部分0<粒度≤1mm的98电熔镁砂按比例进行预混合;
3)混练:
先将3mm<粒度≤5mm的98电熔镁砂、1mm<粒度≤3mm的98电熔镁砂、剩余的0<粒度≤1mm的98电熔镁砂干混≥3min,然后加入结合剂再混3~5min,加入步骤2)得到的预混料和98电熔镁砂200目细粉,混合搅拌20~25min,然后出料;
4)机压成型:
采用1000吨压砖机成型,成型体密≥3.32g/cm3;
5)热处理:
干燥窑≥200℃,热处理时间≥12h。
成品RH插入管用无铬不烧砖的理化指标见表1。
表1:成品砖的理化指标
项目 | 检测指标 |
MgO,% | 82.50 |
SiO<sub>2</sub>,% | 1.02 |
Al<sub>2</sub>O<sub>3</sub>,% | 9.94 |
ZrO<sub>2</sub>,% | 2.84 |
TiO<sub>2</sub>,% | 1.54 |
显气孔率,% | 4.35 |
体密密度,g/cm<sup>3</sup> | 3.30 |
常温耐压强度,MPa | 50 |
热震(950℃×3风冷),次 | >70 |
实施例:
RH插入管用无铬不烧砖的原料见表2。
表2:实施例1-5RH插入管用无铬不烧砖的制备配方
实施例不烧低铬镁质复合砖的制备方法,
1)原料破碎、筛分、细磨:
将98电熔镁砂在破碎机中破碎,筛分为0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm、200目细粉。状刚玉超微粉、铝粉、硅粉、活性脱硅锆超微粉、二氧化钛备用。
实施例原料指标见表3
表3:实施例1-5主要原料指标 单位:wt%
2)预混料:
将砂0-1mm粒度的98电熔镁分为两部分。先板状刚玉超微粉、铝粉、硅粉、活性脱硅锆超微粉、二氧化钛、一部分的98电熔0-1mm进行预混合;
3)混练:
先加3-5mm、1-3mm和剩余另一部分的0-1mm粒度的98电熔镁砂,干混≥3min,然后加入结合剂酚醛树脂,再混3~5min,加入预混料和98电熔镁砂200目,混20~25min,然后出料。
4)机压成型
采用1000吨压砖机成型,成型体密≥3.32g/cm3。
5)热处理
干燥窑,≥200℃,热处理时间≥12h。
Claims (4)
1.一种RH插入管用无铬不烧砖,其特征在于,包括以下重量份原料:
1mm<粒度≤3mm的98电熔镁铝尖晶石10-15份;0<粒度≤1mm的98电熔镁砂25-30份;1mm<粒度≤3mm的98电熔镁砂15-20份;3mm<粒度≤5mm的98电熔镁砂10-15份;98电熔镁砂200目细粉20-25份;板状刚玉超微粉3-5份;铝粉1-1.5份;硅粉1-1.5份;活性脱硅锆超微粉2-4份;二氧化钛1-3份;结合剂2-4份。
2.根据权利要求1所述的一种RH插入管用无铬不烧砖,其特征在于,所述板状刚玉超微粉粒度为325目。
3.根据权利要求1所述的一种RH插入管用无铬不烧砖,其特征在于,所述结合剂是酚醛树脂。
4.根据权利要求1-3任意一项所述的一种RH插入管用无铬不烧砖的制备方法,其特征在于,包括以下步骤:
1)原料破碎、筛分、细磨:
将98电熔镁砂在破碎机中破碎,筛分为0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm、200目细粉;
2)预混料:
板状刚玉超微粉、铝粉、硅粉、活性脱硅锆超微粉、二氧化钛、一部分0<粒度≤1mm的98电熔镁砂按比例进行预混合;
3)混练:
先将3mm<粒度≤5mm的98电熔镁砂、1mm<粒度≤3mm的98电熔镁砂、剩余的0<粒度≤1mm的98电熔镁砂干混≥3min,然后加入结合剂再混3~5min,加入步骤2)得到的预混料和98电熔镁砂200目细粉,混合搅拌20~25min,然后出料;
4)机压成型:
采用1000吨压砖机成型,成型体密≥3.32g/cm3;
5)热处理:
干燥窑≥200℃,热处理时间≥12h。
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CN116283327A (zh) * | 2023-03-10 | 2023-06-23 | 安徽瑞泰新材料科技有限公司 | 一种含刚玉超微粉的铝硅质耐火砖及其制备方法 |
CN118812241A (zh) * | 2024-09-19 | 2024-10-22 | 北京利尔高温材料股份有限公司 | 一种rh精炼炉浸渍管用不烧镁铝尖晶石砖及其制备方法 |
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CN116283327A (zh) * | 2023-03-10 | 2023-06-23 | 安徽瑞泰新材料科技有限公司 | 一种含刚玉超微粉的铝硅质耐火砖及其制备方法 |
CN118812241A (zh) * | 2024-09-19 | 2024-10-22 | 北京利尔高温材料股份有限公司 | 一种rh精炼炉浸渍管用不烧镁铝尖晶石砖及其制备方法 |
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