CN108046837A - 一种钢包用耐火浇注料及其制备方法 - Google Patents

一种钢包用耐火浇注料及其制备方法 Download PDF

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CN108046837A
CN108046837A CN201810091376.6A CN201810091376A CN108046837A CN 108046837 A CN108046837 A CN 108046837A CN 201810091376 A CN201810091376 A CN 201810091376A CN 108046837 A CN108046837 A CN 108046837A
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黎文泰
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Abstract

本发明属于耐火材料技术领域,具体涉及一种钢包用耐火浇注料及其制备方法。所述耐火浇注料由以下重量份数的原料制成:微孔刚玉骨料40‑60份,莫来石10‑30份,硅藻土10‑20份,凹凸棒粘土3‑5份,水泥30‑40份,碳化硅1‑5份,硅微粉5‑15份;外加占上述原料总重量0.2‑0.5%的减水剂和占上述原料总重量0.03‑0.1%的聚丙烯纤维,所述微孔刚玉骨料的粒径1‑5mm,孔径为0.5‑1.2μm,显气孔率为4‑10%,体积密度2‑3.2g/cm3。本发明耐火浇注料热导率低,显气孔率合适,强度高,质量轻,热震稳定性高。

Description

一种钢包用耐火浇注料及其制备方法
技术领域
本发明属于耐火材料技术领域,具体涉及一种钢包用耐火浇注料及其制备方法。
背景技术
目前耐火材料广泛应用于钢包内衬材料,在钢水精炼过程中,耐火材料容易受到熔渣的侵蚀和渗透,出现开裂,甚至剥落,使用寿命短仅仅1年左右,而且现有的耐火浇注料导热系数高往往导致大量的热量损失,钢水温度下降较快,影响钢坯的质量。
公告号为CN105236995B的中国专利公开了一种轻量刚玉-尖晶石浇注料及其制备方法。其技术方案是:以60~75wt%的等径微孔刚玉球为骨料,以8~12wt%的电熔白刚玉细粉、2~8wt%的电熔镁砂细粉、2~8wt%的镁铝尖晶石微粉、6~12wt%的α-Al2O3微粉、0.5~2.5wt%的氧化铬微粉和3~7wt%的铝硅凝胶粉为基质料,骨料和基质料之和为原料;以所述原料0.02~0.08wt%的有机纤维和0.05~0.12wt%的聚羧酸减水剂为外加剂。先将基质料与外加剂预混,加入骨料混匀,外加所述原料3~5wt%的水,搅拌,浇注成型,110~200℃保温12~48小时,800~1200℃烘烤24~72小时,制得轻量刚玉-尖晶石浇注料。但是,该专利仅采用等径微孔刚玉球为骨料,所得浇注料强度偏低,而且重量大,不便于使用。
公告号为CN103693980B的中国专利公开了一种轻质微孔隔热浇注料即制备方法。该发明通过制备稳定的微孔泡沫并将其加入到浇注料中来达到提高浇注料的气孔率并使浇注料内气孔微纳米化。40-70wt%轻质微孔颗粒为骨料,10-15wt%的细粉、10-20wt%的微粉和10-25wt%的结合剂为基质;另外加入骨料和基质体积之和30-70v%气泡稳定的微孔泡沫。该发明方法即保证了浇注料临界粒度较大的特点,又引入了大量微孔泡沫,气泡直径≤0.1mm,制得的轻质微孔隔热浇注料具有气孔率高、强度高、热导率低和良好的抗热震稳定性,使用温度可达到1700℃。但是,该专利采用微孔泡沫并将其加入到浇注料中来达到提高浇注料的气孔率,所得气孔不稳定,浇注料强度低。
发明内容
为克服上述缺陷,本发明的目的在于提供一种钢包用耐火浇注料及其制备方法。
为实现上述目的,本发明采用如下技术方案:
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料40-60份,莫来石10-30份,硅藻土10-20份,凹凸棒粘土3-5份,水泥30-40份,碳化硅1-5份,硅微粉5-15份;外加占上述原料总重量0.2-0.5%的减水剂和占上述原料总重量0.03-0.1%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
优选地,所述微孔刚玉骨料的制备方法为:将70-80份的γ-Al2O3微粉、10-15份的MgO微粉、1-3份α-Al2O3纳米粉和0.5-1份CaCO3微粉,球磨均匀,然后加入15-20份苏州粘土和0.3-1份减水剂,100-120℃干燥16-24h,然后1400-1600℃烧结3-6h,即得。
优选地,所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
优选地,所述减水剂为三聚磷酸钠、六偏磷酸钠或者聚丙烯酸钠。
优选地,所述莫来石为M60莫来石或者M70莫来石。
优选地,所述碳化硅的粒径≤0.074mm。
优选地,所述硅微粉的粒度≤0.02μm。
优选地,所述硅藻土或者凹凸棒粘土的粒度≤2mm。
优选地,所述水泥为70水泥或者925水泥。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将各种原料加入搅拌机中,混合5-10min,然后加入原料总重量3-8%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,110-150℃条件下保温8-15h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以10-15℃/h的升温速率从室温升至150-200℃,保温10-15h,然后以30-50℃/h的升温速率升温至300-500℃,保温15-22h,最后以15-25℃/h的升温速率升温至1000-1200℃,保温6-10h,即得。
本发明的积极有益效果:
1. 本发明微孔刚玉骨料孔径小,显气孔率高,有利于提高浇注料隔热保温能力和抗熔渣侵蚀能力,而且体积密度小,降低浇注料重量,莫来石中含有少量SiO2玻璃相,缓冲材料中的应力,同时热膨胀系数又比较低,有利于提高浇注料的抗热震性能和高温抗折强度,微孔刚玉骨料与莫来石合用为浇注料骨料,强度高,质量轻,而且气孔较多,熔渣扩散通道较多,抗热震和抗剥落性能好;本发明硅藻土、凹凸棒粘土和水泥为粘合剂,硅藻土松散、质轻、多孔,化学性质稳定,提高浇注料的孔隙率,凹凸棒粘土流平性好,吸水性强,沾湿时具有粘性和可塑性,本发明粘合剂充分混合团结各原料;本发明碳化硅和硅微粉粒径小而强度高,能够填充到粘合剂空隙中,提高浇注料的强度;聚丙烯纤维在烧结过程中受热燃烧或熔化,有利于浇注料中微细气孔的形成,进一步提高了浇注料抵抗熔渣侵蚀的能力。本发明各种原料协同作用,1200℃导热率≤0.63 W/m•k,热导率低,保温效果好,减少钢水热量损失;显气孔率10-12%,抗熔渣侵蚀性能优异;体积密度≤1.7g/cm3,体积密度小,质量轻;1200℃水冷法热震稳定性试验可循环至少25次,热震稳定性好;常温耐压强度≥12.4 MPa,浇注料1450℃*3h条件下加热后线收缩率≤0.9%,抗折强度≥7.5MPa,浇注料强度高。
2. 本发明微孔刚玉骨料采用γ-Al2O3微粉、MgO微粉、α-Al2O3纳米粉和CaCO3微粉制备而成,所得微孔刚玉骨料体积密度小、质量轻、显气孔率高。
3. 本发明耐火浇注料采用先10-15℃/h的升温速率缓慢升温保温10-15h,然后30-50℃/h的升温速率快速升温15-22h,最后15-25℃/h的升温速率平稳升温保温6-10h的烧结方法烘烤成型,升温平稳,形成浇注料结构致密,内部孔径均匀一致,所得钢包浇注料强度高。
具体实施方式
下面结合一些具体实施方式,对本发明进一步说明。
实施例1
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料40份,M60莫来石10份,硅藻土10份,凹凸棒粘土3份,70水泥30份,碳化硅1份,硅微粉5份;外加占上述原料总重量0.2%的减水剂和占上述原料总重量0.03%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将70份的γ-Al2O3微粉、12份的MgO微粉、1份α-Al2O3纳米粉和0.5份CaCO3微粉,球磨均匀,然后加入15份苏州粘土和0.3份减水剂,100℃干燥20h,然后1400℃烧结6h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为三聚磷酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合5min,然后加入原料总重量5%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,110℃条件下保温15h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以10℃/h的升温速率从室温升至180℃,保温12h,然后以30℃/h的升温速率升温至300℃,保温22h,最后以15℃/h的升温速率升温至1000℃,保温10h,即得。
实施例2
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料42份,M70莫来石15份,硅藻土13份,凹凸棒粘土3.2份,925水泥30份,碳化硅1.6份,硅微粉6份;外加占上述原料总重量0.2%的减水剂和占上述原料总重量0.05%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将72份的γ-Al2O3微粉、10份的MgO微粉、1.2份α-Al2O3纳米粉和0.6份CaCO3微粉,球磨均匀,然后加入16份苏州粘土和0.4份减水剂,110℃干燥16h,然后1500℃烧结4h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为六偏磷酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合6min,然后加入原料总重量3%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,150℃条件下保温8h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以11℃/h的升温速率从室温升至150℃,保温11h,然后以40℃/h的升温速率升温至300℃,保温16h,最后以15℃/h的升温速率升温至1100℃,保温6h,即得。
实施例3
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料45份,M60莫来石16份,硅藻土14份,凹凸棒粘土4份,70水泥31份,碳化硅2.5份,硅微粉9份;外加占上述原料总重量0.3%的减水剂和占上述原料总重量0.06%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将73份的γ-Al2O3微粉、13份的MgO微粉、1.3份α-Al2O3纳米粉和0.5份CaCO3微粉,球磨均匀,然后加入17份苏州粘土和0.5份减水剂,100℃干燥18h,然后1500℃烧结3h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为聚丙烯酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合6min,然后加入原料总重量4%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,120℃条件下保温10h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以12℃/h的升温速率从室温升至160℃,保温10h,然后以35℃/h的升温速率升温至350℃,保温20h,最后以20℃/h的升温速率升温至1200℃,保温8h,即得。
实施例4
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料48份,M70莫来石18份,硅藻土15份,凹凸棒粘土4.1份,70水泥33份,碳化硅2.7份,硅微粉10份;外加占上述原料总重量0.35%的减水剂和占上述原料总重量0.06%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将74份的γ-Al2O3微粉、14份的MgO微粉、1.5份α-Al2O3纳米粉和0.6份CaCO3微粉,球磨均匀,然后加入18份苏州粘土和0.6份减水剂,100℃干燥20h,然后1600℃烧结5h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为三聚磷酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合7min,然后加入原料总重量5%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,120℃条件下保温9h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以13℃/h的升温速率从室温升至170℃,保温12h,然后以40℃/h的升温速率升温至400℃,保温15h,最后以20℃/h的升温速率升温至1000℃,保温8h,即得。
实施例5
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料50份,M70莫来石20份,硅藻土15份,凹凸棒粘土4.3份,925水泥35份,碳化硅3份,硅微粉12份;外加占上述原料总重量0.4%的减水剂和占上述原料总重量0.08%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将75份的γ-Al2O3微粉、14份的MgO微粉、2份α-Al2O3纳米粉和0.7份CaCO3微粉,球磨均匀,然后加入16份苏州粘土和0.6份减水剂,110℃干燥20h,然后1600℃烧结4h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为聚丙烯酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合7min,然后加入原料总重量5%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,130℃条件下保温10h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以13℃/h的升温速率从室温升至180℃,保温13h,然后以40℃/h的升温速率升温至400℃,保温18h,最后以20℃/h的升温速率升温至1200℃,保温9h,即得。
实施例6
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料51份,M60莫来石23份,硅藻土16份,凹凸棒粘土4.5份,70水泥36份,碳化硅3.3份,硅微粉13份;外加占上述原料总重量0.4%的减水剂和占上述原料总重量0.08%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将78份的γ-Al2O3微粉、13份的MgO微粉、2.1份α-Al2O3纳米粉和0.7份CaCO3微粉,球磨均匀,然后加入18份苏州粘土和0.7份减水剂,110℃干燥21h,然后1500℃烧结5h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为六偏磷酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合8min,然后加入原料总重量6%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,130℃条件下保温12h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以14℃/h的升温速率从室温升至180℃,保温13h,然后以40℃/h的升温速率升温至450℃,保温20h,最后以25℃/h的升温速率升温至1100℃,保温9h,即得。
实施例7
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料56份,M70莫来石28份,硅藻土19份,凹凸棒粘土4.7份,925水泥39份,碳化硅4份,硅微粉14份;外加占上述原料总重量0.45%的减水剂和占上述原料总重量0.09%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将79份的γ-Al2O3微粉、15份的MgO微粉、2.2份α-Al2O3纳米粉和0.8份CaCO3微粉,球磨均匀,然后加入19份苏州粘土和0.8份减水剂,120℃干燥22h,然后1400℃烧结6h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为三聚磷酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合9min,然后加入原料总重量7%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,120℃条件下保温14h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以14℃/h的升温速率从室温升至190℃,保温14h,然后以45℃/h的升温速率升温至480℃,保温21h,最后以25℃/h的升温速率升温至1100℃,保温10h,即得。
实施例8
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料60份,M60莫来石30份,硅藻土20份,凹凸棒粘土5份,925水泥40份,碳化硅5份,硅微粉15份;外加占上述原料总重量0.5%的减水剂和占上述原料总重量0.1%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
所述微孔刚玉骨料的制备方法为:将80份的γ-Al2O3微粉、15份的MgO微粉、3份α-Al2O3纳米粉和1份CaCO3微粉,球磨均匀,然后加入20份苏州粘土和1份减水剂,120℃干燥24h,然后1600℃烧结3h,即得。
所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
所述减水剂为六偏磷酸钠。
所述碳化硅的粒径≤0.074mm。
所述硅微粉的粒度≤0.02μm。
所述硅藻土或者凹凸棒粘土的粒度≤2mm。
上述钢包用耐火浇注料的制备方法,包括以下步骤:
(1)将上述原料加入搅拌机中,混合10min,然后加入原料总重量8%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,150℃条件下保温10h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以15℃/h的升温速率从室温升至200℃,保温15h,然后以50℃/h的升温速率升温至500℃,保温22h,最后以20℃/h的升温速率升温至1000℃,保温10h,即得。
对比实施例1
本实施例钢包用耐火浇注料与实施例5基本相同,不同之处在于:
一种钢包用耐火浇注料,由以下重量份数的原料制成:
板状刚玉骨料50份,M70莫来石20份,硅藻土15份,凹凸棒粘土4.3份,925水泥35份,碳化硅3份,硅微粉12份;外加占上述原料总重量0.4%的减水剂和占上述原料总重量0.08%的聚丙烯纤维,所述板状刚玉骨料的粒度为0.075~4 mm,显气孔率为2.8%,体积密度3.6g/cm3
对比实施例2
本实施例钢包用耐火浇注料与实施例5基本相同,不同之处在于:
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料70份,硅藻土15份,凹凸棒粘土4.3份,925水泥35份,碳化硅3份,硅微粉12份,外加占上述原料总重量0.4%的减水剂和占上述原料总重量0.08%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
对比实施例3
本实施例钢包用耐火浇注料与实施例5基本相同,不同之处在于:
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料50份,M70莫来石20份,硅藻土19.3份,925水泥35份,碳化硅3份,硅微粉12份;外加占上述原料总重量0.4%的减水剂和占上述原料总重量0.08%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
对比实施例4
本实施例钢包用耐火浇注料与实施例5基本相同,不同之处在于:
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料50份,M70莫来石20份,凹凸棒粘土19.3份,925水泥35份,碳化硅3份,硅微粉12份;外加占上述原料总重量0.4%的减水剂和占上述原料总重量0.08%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
对比实施例5
本实施例钢包用耐火浇注料与实施例5基本相同,不同之处在于:
一种钢包用耐火浇注料,由以下重量份数的原料制成:
微孔刚玉骨料50份,M70莫来石20份,硅藻土15份,凹凸棒粘土4.3份,925水泥35份;外加占上述原料总重量0.4%的减水剂和占上述原料总重量0.08%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
对上述实施例1-8及对比实施例1-5耐火浇注料进行性能检测,结果见表1。
表1 本发明实施例1-8及对比实施例1-5耐火浇注料的性能检测结果
由表1可知,对比实施例1将微孔刚玉骨料替代为板状刚玉,对比实施例2省略M70莫来石,对比实施例3省略凹凸棒粘土,对比实施例4省略硅藻土,对比实施例5省略碳化硅和硅微粉,与对比实施例1-5耐火浇注料相比,本发明实施例1-8耐火浇注料1200℃导热率≤0.63 W/m•k,热导率低,保温效果好,减少钢水热量损失;显气孔率10-12%,抗熔渣侵蚀性能优异;体积密度≤1.7g/cm3,体积密度小,质量轻;1200℃水冷法热震稳定性试验可循环至少25次,热震稳定性好;常温耐压强度≥12.4 MPa,浇注料1450℃*3h条件下加热后线收缩率≤0.9%,抗折强度≥7.5MPa,浇注料强度高。

Claims (10)

1.一种钢包用耐火浇注料,其特征在于,由以下重量份数的原料制成:
微孔刚玉骨料40-60份,莫来石10-30份,硅藻土10-20份,凹凸棒粘土3-5份,水泥30-40份,碳化硅1-5份,硅微粉5-15份;外加占上述原料总重量0.2-0.5%的减水剂和占上述原料总重量0.03-0.1%的聚丙烯纤维,所述微孔刚玉骨料的粒径1-5mm,孔径为0.5-1.2μm,显气孔率为4-10%,体积密度2-3.2g/cm3
2.根据权利要求1所述的钢包用耐火浇注料,其特征在于,所述微孔刚玉骨料的制备方法为:将70-80份的γ-Al2O3微粉、10-15份的MgO微粉、1-3份α-Al2O3纳米粉和0.5-1份CaCO3微粉,球磨均匀,然后加入15-20份苏州粘土和0.3-1份减水剂,100-120℃干燥16-24h,然后1400-1600℃烧结3-6h,即得。
3.根据权利要求2所述的钢包用耐火浇注料,其特征在于,所述γ-Al2O3微粉的粒径为1-6μm,所述MgO微粉的粒径为5-9μm,所述α-Al2O3纳米粉的粒径为200-250nm,所述CaCO3微粉的粒径为1-5μm。
4.根据权利要求1或者2所述的钢包用耐火浇注料,其特征在于,所述减水剂为三聚磷酸钠、六偏磷酸钠或者聚丙烯酸钠。
5.根据权利要求1所述的钢包用耐火浇注料,其特征在于,所述莫来石为M60莫来石或者M70莫来石。
6.根据权利要求1所述的钢包用耐火浇注料,其特征在于,所述碳化硅的粒径≤0.074mm。
7.根据权利要求1所述的钢包用耐火浇注料,其特征在于,所述硅微粉的粒度≤0.02μm。
8.根据权利要求1所述的钢包用耐火浇注料,其特征在于,所述硅藻土或者凹凸棒粘土的粒度≤2mm。
9.根据权利要求1所述的钢包用耐火浇注料,其特征在于,所述水泥为70水泥或者925水泥。
10.一种权利要求1所述的钢包用耐火浇注料的制备方法,其特征在于,包括以下步骤:
(1)将各种原料加入搅拌机中,混合5-10min,然后加入原料总重量3-8%的水,搅拌均匀;
(2)将步骤(1)搅拌均匀的浇注料注入模具内,振动成型,110-150℃条件下保温8-15h,脱模,得到坯体;
(3)将步骤(2)坯体进行升温烘烤,所述升温烘烤为首先以10-15℃/h的升温速率从室温升至150-200℃,保温10-15h,然后以30-50℃/h的升温速率升温至300-500℃,保温15-22h,最后以15-25℃/h的升温速率升温至1000-1200℃,保温6-10h,即得。
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