CN109678534B - 钢包炉衬用铝镁碳砖 - Google Patents
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Abstract
本发明公开了一种钢包炉衬用铝镁碳砖,按重量百分比包括50~70%的铝镁碳再生料、5~20%的镁砂、10~25%的α‑Al2O3、3~10%的AlN、2~6%的鳞片石墨、2~3%的碳化硅及2.5~3.5%的酚醛树脂。本发明的铝镁碳砖由于加入AlN,相比传统铝镁碳砖,更耐高温冲刷,在使用温度下降低了砖体膨胀悉数,维持了体积稳定性,AlN的不受熔融金属侵蚀,提高了材料的抗渣性;加入的石墨量较少,有利于钢水脱碳,冶炼超低碳钢种;大量采用了铝镁碳砖再生料,较大降低了高铝矾土熟料或刚玉颗粒料的使用量,生产成本更低,具有较好的社会效益和经济效益。
Description
技术领域
本发明涉及钢包精炼用炉衬砖,具体涉及一种钢包炉衬用铝镁碳砖。
背景技术
通常钢包内衬用耐火材料为铝镁碳砖,有矾土(刚玉)、镁砂、石墨通过酚醛树脂结合机压制成,具有较好的性能;其损毁方式主要为钢液和渣侵蚀、热冲刷剥落、热态体积变化过大造成的损毁。随着精炼工艺的提高,传统铝镁碳砖难以满足精炼工艺要求。市场常见的铝镁碳砖中石墨的加入量为6~12%wt,碳的引入加强了材料与钢水的不润湿性,提高了材料的抗渣性和热稳定性,但碳含量过高不利于超洁净钢的生产。
发明内容
本发明的目的就是针对上述技术的不足,提供一种既能少量引入石墨,又能确保材料良好的热稳定性、抗渣性和热态强度的钢包炉衬用铝镁碳砖。
为实现上述目的,本发明所设计的钢包炉衬用铝镁碳砖,按重量百分比包括如下原料:
进一步地,所述铝镁碳砖按重量百分比包括如下原料:
进一步地,所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳砖再生料粒度为0.088mm≤粒度≤6mm;其中:0.088mm≤粒度≤1mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的5~25%,1mm≤粒度≤3mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的15~50%,3mm≤粒度≤5mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的30~50%。
进一步地,所述镁砂中MgO的质量百分比≥97%,且镁砂的粒度≤1mm;其中:0.088mm≤粒度≤1mm的镁砂占镁砂总质量的60~65%,粒度≤0.088mm的镁砂占镁砂总质量的35~40%。
进一步地,所述α-Al2O3中Al2O3的的质量百分比≥99%,且粒度≤0.088mm。
进一步地,所述氮化铝中AlN的质量百分比≥98%,且粒度≤0.088mm。
进一步地,所述鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm。
进一步地,所述碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm。
进一步地,所述硅微粉粒度≤0.088mm。
进一步地,所述酚醛树脂为热固型酚醛树脂。
控制镁砂的粒度≤1mm、Al2O3粒度≤0.088mm能增加铝镁碳砖的高温反应产物MgAl2O3的量,使砖体产生微膨胀,填充颗粒间空隙,降低铝镁碳砖的显气孔率,改善铝镁碳砖在使用过程中抗渣性,并具有良好的热震稳定性。若镁砂粒度≥1mm、Al2O3粒度≥0.088mm,高温下,颗粒间难以充分反应,MgAl2O3仅在镁砂颗粒表面形成极少量,难以达到提高高温使用性能的效果。
AlN的导热率高达260W/(M.K),比Al2O3高5~8倍,已细粉形式(粒度≤0.088mm)引入使得铝镁碳砖基质更耐高温冲刷,提高了铝镁碳砖的热态强度,AlN不受熔融金属侵蚀,提高了铝镁碳砖的抗渣性;另外,AlN高温下可向Al2O3和MgAl2O4中固溶,对砖的基质部分有增强作用。
与现有技术相比,本发明的有益效果如下:
1)本发明的铝镁碳砖由于加入AlN,相比传统铝镁碳砖,更耐高温冲刷,在使用温度下降低了砖体膨胀悉数,维持了体积稳定性,AlN的不受熔融金属侵蚀,提高了材料的抗渣性;加入的石墨量较少,有利于钢水脱碳,冶炼超低碳钢种;大量采用了铝镁碳砖再生料,较大降低了高铝矾土熟料或刚玉颗粒料的使用量,生产成本更低,具有较好的社会效益和经济效益;
2)本发明的铝镁碳砖热膨胀系数低、热稳定性好、热态强度好,且碳含量较低、抗渣侵蚀性好、使用寿命长,能满足钢包精炼工艺,尤其是LF精炼。
具体实施方式
下面结合具体实施例和对比例对本发明作进一步的详细说明,便于更清楚地了解本发明,但它们不对本发明构成限定。
实施例1
铝镁碳砖按重量百分比包括如下原料:
其中,所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳砖再生料粒度为0.088mm≤粒度≤6mm,其中:0.088mm≤粒度≤1mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的5%、1mm≤粒度≤3mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的50%、3mm≤粒度≤5mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的45%;镁砂中MgO的质量百分比≥97%,且镁砂的粒度≤1mm,其中:0.088mm≤粒度≤1mm的镁砂占镁砂总质量的65%,粒度≤0.088mm的镁砂占镁砂总质量的35%;α-Al2O3中Al2O3的的质量百分比≥99%,且粒度≤0.088mm;氮化铝中AlN的质量百分比≥98%,且粒度≤0.088mm;鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm;碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm;硅微粉粒度≤0.088mm;酚醛树脂为热固型酚醛树脂。
实施例1制得的铝镁碳砖体积密度为2.93g/cm3,显气孔率8.1%,1400℃保温半小时的抗折强度为16.9MPa,静态坩埚法检测抗渣侵蚀性指标为26.3%。
实施例2
铝镁碳砖按重量百分比包括如下原料:
其中,所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳砖再生料粒度为0.088mm≤粒度≤6mm,其中:0.088mm≤粒度≤1mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的5%、1mm≤粒度≤3mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的50%、3mm≤粒度≤5mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的45%;镁砂中MgO的质量百分比≥97%,且镁砂的粒度≤1mm,其中:0.088mm≤粒度≤1mm的镁砂占镁砂总质量的65%,粒度≤0.088mm的镁砂占镁砂总质量的35%;α-Al2O3中Al2O3的的质量百分比≥99%,且粒度≤0.088mm;氮化铝中AlN的质量百分比≥98%,且粒度≤0.088mm;鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm;碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm;硅微粉粒度≤0.088mm;酚醛树脂为热固型酚醛树脂。
实施例2制得的铝镁碳砖体积密度为2.95g/cm3,显气孔率7.9%,1400℃保温半小时的抗折强度为17.5MPa,静态坩埚法检测抗渣侵蚀性指标为25.9%。
实施例3
铝镁碳砖按重量百分比包括如下原料:
其中,所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳砖再生料粒度为0.088mm≤粒度≤6mm,其中:0.088mm≤粒度≤1mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的5%、1mm≤粒度≤3mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的50%、3mm≤粒度≤5mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的45%;镁砂中MgO的质量百分比≥97%,且镁砂的粒度≤1mm,其中:0.088mm≤粒度≤1mm的镁砂占镁砂总质量的65%,粒度≤0.088mm的镁砂占镁砂总质量的35%;α-Al2O3中Al2O3的的质量百分比≥99%,且粒度≤0.088mm;氮化铝中AlN的质量百分比≥98%,且粒度≤0.088mm;鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm;碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm;硅微粉粒度≤0.088mm;酚醛树脂为热固型酚醛树脂。
实施例3制得的铝镁碳砖体积密度为2.94g/cm3,显气孔率8.0%,1400℃保温半小时的抗折强度为17.1MPa,静态坩埚法检测抗渣侵蚀性指标为26.1%。
对比例1
铝镁碳砖按重量百分比包括如下原料:
其中,所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳砖再生料粒度为0.088mm≤粒度≤6mm,其中:0.088mm≤粒度≤1mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的20%、1mm≤粒度≤3mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的30%、3mm≤粒度≤5mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的50%;镁砂中MgO的质量百分比≥97%,且镁砂的粒度≤1mm,其中:0.088mm≤粒度≤1mm的镁砂占镁砂总质量的60%,粒度≤0.088mm的镁砂占镁砂总质量的40%;α-Al2O3中Al2O3的的质量百分比≥99%,且粒度≤0.088mm;氮化铝中AlN的质量百分比≥98%,且粒度≤0.088mm;鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm;碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm;硅微粉粒度≤0.088mm;酚醛树脂为热固型酚醛树脂。
对比例1制得的铝镁碳砖体积密度为2.87g/cm3,显气孔率9.4%,1400℃保温半小时的抗折强度为10.3MPa,静态坩埚法检测抗渣侵蚀性指标为40.2%。
对比例2
铝镁碳砖按重量百分比包括如下原料:
其中,所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳砖再生料粒度为0.088mm≤粒度≤6mm,其中:0.088mm≤粒度≤1mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的20%、1mm≤粒度≤3mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的50%、3mm≤粒度≤5mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的30%;镁砂中MgO的质量百分比≥97%,且镁砂的粒度≤1mm,其中:0.088mm≤粒度≤1mm的镁砂占镁砂总质量的10%,粒度≤0.088mm的镁砂占镁砂总质量的90%;α-Al2O3中Al2O3的的质量百分比≥99%,且粒度≤0.088mm;氮化铝中AlN的质量百分比≥98%,且粒度≤0.088mm;鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm;碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm;硅微粉粒度≤0.088mm;酚醛树脂为热固型酚醛树脂。
对比例2制得的铝镁碳砖体积密度为2.87g/cm3,显气孔率9.1%,1400℃保温半小时的抗折强度为11.5MPa,静态坩埚法检测抗渣侵蚀性指标为39.4%。
对比例3
铝镁碳砖按重量百分比包括如下原料:
其中,所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳砖再生料粒度为0.088mm≤粒度≤6mm,其中:0.088mm≤粒度≤1mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的5%、1mm≤粒度≤3mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的50%、3mm≤粒度≤5mm的铝镁碳砖再生料占铝镁碳砖再生料总质量的45%;镁砂中MgO的质量百分比≥97%,且镁砂的粒度≤1mm,其中:0.088mm≤粒度≤1mm的镁砂占镁砂总质量的65%,粒度≤0.088mm的镁砂占镁砂总质量的35%;α-Al2O3中Al2O3的的质量百分比≥99%,且粒度≤0.088mm;氮化铝中AlN的质量百分比≥98%,且粒度≤0.088mm;鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm;碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm;硅微粉粒度≤0.088mm;酚醛树脂为热固型酚醛树脂。
对比例3制得的铝镁碳砖体积密度为2.88g/cm3,显气孔率8.4%,1400℃保温半小时的抗折强度为13.5MPa,静态坩埚法检测抗渣侵蚀性指标为29.9%。
由上述三个对比例和三个实施例可以看出,加入了α-Al2O3和AlN且重量百分比分别为10~25%、3~10%的铝镁碳砖体积密度大于对比例,显气孔率小于对比例,抗折强度大于对比例,抗渣侵蚀小于对比例,即本发明由于加入AlN,相比传统铝镁碳砖,更耐高温冲刷,在使用温度下降低了砖体膨胀悉数,维持了体积稳定性,AlN的不受熔融金属侵蚀,提高了材料的抗渣性,AlN高温下可向Al2O3和MgAl2O4中固溶,对砖的基质部分有增强作用。
Claims (5)
2.根据权利要求1所述钢包炉衬用铝镁碳砖,其特征在于:所述铝镁碳再生料中Al2O3的质量百分比≥45%,且铝镁碳再生料粒度为0.088mm≤粒度≤6mm;其中:0.088mm≤粒度≤1mm的铝镁碳再生料占铝镁碳再生料总质量的5~25%,1mm≤粒度≤3mm的铝镁碳再生料占铝镁碳再生料总质量的15~50%,3mm≤粒度≤5mm的铝镁碳再生料占铝镁碳再生料总质量的30~50%。
3.根据权利要求1所述钢包炉衬用铝镁碳砖,其特征在于:所述鳞片石墨中C的质量百分比≥94%,且粒度≤0.088mm。
4.根据权利要求1所述钢包炉衬用铝镁碳砖,其特征在于:所述碳化硅中SiC的质量百分比≥96%,且粒度≤0.088mm。
5.根据权利要求1所述钢包炉衬用铝镁碳砖,其特征在于:所述酚醛树脂为热固型酚醛树脂。
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