CN111548129A - 一种抗侵蚀铝镁浇注料 - Google Patents

一种抗侵蚀铝镁浇注料 Download PDF

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CN111548129A
CN111548129A CN202010395930.7A CN202010395930A CN111548129A CN 111548129 A CN111548129 A CN 111548129A CN 202010395930 A CN202010395930 A CN 202010395930A CN 111548129 A CN111548129 A CN 111548129A
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parts
castable
percent
alumina
erosion
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杨强
李德民
王义龙
马伟平
黄建坤
梁小龙
王子军
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Tangshan Guoliang Special Refractory Material Co ltd
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Abstract

本发明涉及一种抗侵蚀铝镁浇注料,其包括如下重量份的各原料:85高铝料、88高铝料、自立板状刚玉、电熔镁砂、镁铝尖晶石、氧化铝微粉、硅微粉、纳米炭黑、抗侵蚀剂ACAO、防爆纤维、减水剂和六偏磷酸钠,本发明所述的抗侵蚀铝镁耐火浇注料在钢包上应用施工性能优越,易于施工成型,能达到脱模及烘烤不开裂、抗冲刷侵蚀、抗氧化以及提高包龄的要求,成型钢包不经二次修补,过钢量达1.2万吨以上,套打浇注后可以继续使用,本发明的抗侵蚀铝镁浇注料具有抗冲刷能力强,使用寿命长等特点,具有良好的应用前景。

Description

一种抗侵蚀铝镁浇注料
技术领域
本发明属于不定型耐火材料技术领域,具体涉及一种抗侵蚀铝镁浇注料。
背景技术
钢包作为钢铁生产过程中一个重要设备,是炼钢和连铸之间的中间容器,钢液由转炉出钢至浇注过程结束都在钢包内,而出于连铸钢材的质量要求,钢包浇注料的质量对于钢液中杂质含量有很大影响,所以钢包浇注料的优化是转炉炼钢品质提高的的重要途径。
钢包浇注料是不定型耐火材料的一种,具有良好的流动性,现有钢包浇注料通常采用的材质有刚玉质、尖晶石质、高铝质、莫来石质等,钢包浇注料不仅承担容器作用,还参与冶炼过程的物理和化学反应,对钢的质量有很大影响。目前,与炉渣接触的钢包浇注料易受到炉渣的侵蚀和渗透,一方面,与炉渣接触的耐火材料会溶解到熔渣及钢水中,另一方面,炉渣的渗透也会导致钢包浇注料发生变质甚至剥落。这不仅会影响钢包浇注料的服役寿命,而且也会因钢包浇注料的蚀损影响钢水的品质。因此开发出抗渣性能优良、稳定的钢包浇注料,是本领域技术人员的关注重点之一。有专利公开了一种钢包用耐火浇注料,其以高铝熟料、矾土水泥、硅微粉、氧化铝和电熔镁砂为原料制备了一种钢包用耐火浇注料,所制备的钢包浇注料虽然具有成本低的优点,但是单纯依靠耐火原料的的抗渣能力,浇注料不具有理想的抗渣性能,寿命较短。
若想提高浇注料的抗侵蚀性能,目前最好的途径是引入优质的碳源,首先,碳材料在高温下难于被渣液润湿,将碳引入浇注料中制成含碳耐火材料后,能显著抑制炉渣侵入,从而阻止了炉渣造成的侵蚀;其次,碳材料具有良好的热震稳定性,它具有低热膨胀系数和高导热系数,利用碳材料的这些特性,含碳耐火材料基本解决了渣蚀和温度变化造成的剥落,生产出了抗渣蚀性和抗热震性好的耐火材料,这是一个划时代的改进,含碳耐火材料的定型制品有广泛应用。但是由于传统碳材料与水的不润湿性,使碳材料难以在不定型耐火材料中得到应用,引入碳源有两个关键,一是如何在不大幅提高加水量的前提下使碳源很好的分散,二是如何防止碳源的氧化而失效,这就需要好的分散剂、减水剂和合适的抗氧化剂来配合使用发挥作用。
为了减轻钢包浇注料损毁现象的发生,要求钢包用耐火材料具有耐高温冲刷性能、耐钢水及钢渣化学侵蚀性、抗氧化性、抗热震性能且致密度高强度好等特点,申请人提出了一种新型抗侵蚀铝镁浇注料的技术方案。
发明内容
本发明的目的在于解决现有技术中存在的问题,提供一种可以延长钢包包役使用寿命、提高钢包安全运行稳定性的抗侵蚀铝镁浇注料。
为实现上述目的,本发明提供了一种抗侵蚀铝镁浇注料,其包括如下重量份的各原料:85高铝料54-64份、88高铝料0-1mm 10-12份、自立板状刚玉6-12份、电熔镁砂4-6份、镁铝尖晶石4-6份、氧化铝微粉5-6份、硅微粉2-3份、纳米炭黑0.5-1份、抗侵蚀剂ACAO 0.5-1份、防爆纤维0.1-0.15份、减水剂0.1-0.15份、六偏磷酸钠0.05份。
作为本发明的一些优选实施方案,所述85高铝料包括85高铝料8-15mm 18-22份、85高铝料5-8mm 8-12份、85高铝料3-5mm 14-15份、85高铝料1-3mm 14-15份。
作为本发明的一些优选实施方案,所述减水剂为ABC
作为本发明的一些优选实施方案,所述抗侵蚀剂为ACAO。
作为本发明的一些优选实施方案,所述氧化铝微粉的成分:Al2O3>99.5%、Na2O<0.1%。
作为本发明的一些优选实施方案,所述硅微粉的成分:SiO2>95%,pH值<4,D50<8微米。硅微粉使用951硅微粉,这种二氧化硅微粉体积平均粒径D50<8微米,比表面积大,其活性高,可以降低钢包浇注料的加水量,提高浇注料的体积密度、冷态强度和热态抗折强度,有效抑制渣对浇注料的侵蚀。
作为本发明的一些优选实施方案,所述纳米炭黑为N330型的固定碳,含量大于99%。通过炭黑提供固定C,碳具有良好的抗渗透性和抗剥落性,其渗入浇注料基质形成弥散分布,均匀分布抑制碳化硅往铁水中的损失,与此同时还能抑制浇注料的烧结特征,使修补易于清理,增强浇注料的抗侵蚀性。
作为本发明的一些优选实施方案,所述85高铝料的成分:氧化铝≥85%、氧化铁0-1.8%、氧化钾与氧化钠的合量0-0.4%。能够有效增强钢包浇注料的抗高温性能。
作为本发明的一些优选实施方案,所述自立板状刚玉的成分:氧化铝≥99%、氧化铁0-0.03%。
作为本发明的一些优选实施方案,所述电熔镁砂的成分:氧化镁≥96%、氧化钙0-1.8%以及氧化硅0-2.0%。能够为钢包浇注料提供良好的耐高温性能以及优秀的抗侵蚀性能,使得钢包浇注料能够有效抵抗高温钢水的冲刷。
作为本发明的一些优选实施方案,所述镁铝尖晶石的成分:氧化铝≥78%,氧化镁≥20%。
在本发明中,防爆纤维为中空结构,其为细小纤维状物质,可贯穿于浇注料的各个缝隙中,其熔点为110℃,将其与上述原料混合均匀后进行烘烤,随着烘烤达到一定温度时,纤维便开始软化、收缩、熔化,最后形成气孔并碳化,它们在成型后的钢包浇注料体内分布形成微小网络气孔,进而打开水气通道,减轻内部应力,防止爆裂,从而提高钢包浇注料整体的使用寿命。
在本发明中,CL370氧化铝微粉是一种双峰活性氧化铝,其纯度高,钠含量低,其细度为d50<2微米,原晶的晶体直径控制在0.5um左右,活性大,可以有效的填充气孔,降低加水量,促进坯体的致密化与烧结。
采用上述技术方案所产生的有益效果在于:
本发明通过各个原料以及各个组分之间产生的协同作用或者增效作用,使制备的钢包浇注料具有优良的高温性能、抗冲刷性能以及抗侵蚀性能,镁铝尖晶石能够与自立板式刚玉产生增效作用,进一步提升钢包浇注料的抗侵蚀性能。
本发明使用的碳源为炭黑N330,但是N330型纳米炭黑作为一种增素剂,会使浇注料流动性变差,增大浇注料的加水量,使用浇注料性能恶化,发明人通过使用对炭黑有较好分散作用的减水剂ABC,可以很好的使炭黑均匀分散,减少加水量,使浇注料更加致密。六偏磷酸具有良好的分散作用从而提升钢包浇注料制备过程中的流动性,因此其又能够作为减水剂与减水剂ABC搭配,起到减少加水量的作用,另一方面六偏磷酸能够与钙、镁等金属离子能生成可溶性络合物,进一步提升钢包浇注料制备过程中的流动性。
本发明自立板状刚玉能够提供优秀的高温性能与抗侵蚀性能,烧结镁铝尖晶具有良好的抗侵蚀能力、抗磨蚀能力以及良好的热震稳定性,能够大幅度提高钢包浇注料的抗侵蚀能力,两者搭配使用,可以增效。
本发明的抗氧化剂使用斯曼的ACAO,它可以很好的提高抗氧化及抗侵蚀性,其粒度很小,在基质分散后,由于其单位耗氧量大,可以很快的与氧气反应,防止浇注料中的碳素被氧化而使结果疏松。
经验证,本发明所述的抗侵蚀铝镁耐火浇注料在钢包上应用施工性能优越,易于施工成型,经过现场试验,能达到脱模及烘烤不开裂、抗冲刷侵蚀、抗氧化以及提高包龄的要求,成型钢包不经二次修补,过钢量达1.2万吨以上,套打浇注后可以继续使用,本发明的抗侵蚀铝镁浇注料具有抗冲刷能力强,使用寿命长等特点,具有良好的应用前景。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面结合具体实施例对发明进行清楚、完整的描述。
实施例1:
一种抗侵蚀铝镁浇注料,其由如下原料制成:
85高铝料8-15mm:18份;85高铝料5-8mm:12份;85高铝料3-5mm:15份;85高铝料1-3mm:15份;
88高铝料0-1mm:10份;
自立板状刚玉200目:11份;
镁铝尖晶石微粉:4份;
96电熔高纯镁砂200目:6份;
活性Al2O3微粉(CL370):5份;
硅微粉(951):3份;
炭黑N330:0.5份;
抗氧化剂ACAO:0.5份;
防爆纤维0.1份;
六偏磷酸钠0.05份;
ABC 0.1份。
采用的性能检测方法按照现行国家标准或行业标准进行,所得检测结果如下表1,上述浇注料在福建某钢厂80吨钢包上使用,使用寿命151炉,出钢量达1.2万吨,养护干燥,烘烤后使用,使用过程中内衬光滑,蚀损均匀,无可见剥落现象,套拆打结包底用料量16吨,提高了耐材吨钢消耗。
表1 抗折强度和耐压强度性能测定
Figure RE-RE-DEST_PATH_IMAGE002
实施例2:
一种抗侵蚀铝镁浇注料,其由如下原料制成:
85高铝料8-15mm:20份;85高铝料5-8mm:10份;85高铝料3-5mm:14份;85高铝料1-3mm:14份;
88高铝料0-1mm:12份;
自立板状刚玉200目:10.7份;
镁铝尖晶石微粉:5份;
96电熔高纯镁砂200目:4份;
活性Al2O3微粉(CL370):6份;
硅微粉(951):2.5份;
炭黑N330:1份;
抗氧化剂ACAO:0.8份;
防爆纤维0.1份;
六偏磷酸钠0.05份,ABC 0.15份。
采用的性能检测方法按照现行国家标准或行业标准进行,所得检测结果如下表2,上述浇注料在珠海某钢厂85吨钢包上使用,使用寿命155炉,出钢量达1.3万吨,套拆打结用料量17.5吨,提高了耐材吨钢消耗。
表2 抗折强度和耐压强度性能测定
Figure RE-RE-DEST_PATH_IMAGE004
实施例3:
一种抗侵蚀铝镁浇注料,其由如下原料制成:
85高铝料8-15mm:22份;85高铝料5-8mm:8份;85高铝料3-5mm:15份;85高铝料1-3mm:15份;
88高铝料0-1mm:12份;
自立板状刚玉200目:6份;
镁铝尖晶石微粉:6份;
96电熔高纯镁砂200目:6份;
活性Al2O3微粉(CL370):6份;
硅微粉(951):2份;
炭黑N330:1份;
抗氧化剂ACAO:1份;
防爆纤维0.15份;
六偏磷酸钠0.05份,ABC 0.15份。
采用的性能检测方法按照现行国家标准或行业标准进行,所得检测结果如下表3,上述浇注料在唐山某钢厂120吨钢包上使用,使用寿命136炉,出钢量达1.6万吨,套拆打结用料21吨,提高了耐材吨钢消耗。
表3 抗折强度和耐压强度性能测定
Figure RE-RE-DEST_PATH_IMAGE006
综上所述,本发明制得的抗侵蚀钢包浇注料性能良好,使钢水不易受炉渣污染钢水及炉渣侵蚀,有效延长了钢包使用寿命。
对比例1
与实施例1的区别在于,不加炭黑,用等量球沥青代替,其余同实施例1。采用的性能检测方法按照现行国家标准或行业标准进行,所得检测结果如下表4。
表4 抗折强度和耐压强度性能测定
Figure RE-RE-DEST_PATH_IMAGE008
对比例2
与实施例2的区别在于,不加ACAO,用等量325目金属硅粉代替,其余同实施例2。采用的性能检测方法按照现行国家标准或行业标准进行,所得检测结果如下表5。
表5 抗折强度和耐压强度性能测定
Figure RE-RE-DEST_PATH_IMAGE010
对比例3
与实施例3的区别在于,减水剂ABC用等量的三聚磷酸钠代替,采用的性能检测方法按照现行国家标准或行业标准进行,所得检测结果如下表6。
表6抗折强度和耐压强度性能测定
Figure RE-RE-DEST_PATH_IMAGE012
最后应说明的是:以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明实施例技术方案的精神和范围。

Claims (10)

1.一种抗侵蚀铝镁浇注料,其特征在于,其包括如下重量份的各原料:85高铝料8-15mm18-22份、85高铝料5-8mm 8-12份、85高铝料3-5mm 14-15份、85高铝料1-3mm 14-15份、88高铝料0-1mm 10-12份、自立板状刚玉6-12份、电熔镁砂4-6份、镁铝尖晶石4-6份、氧化铝微粉5-6份、硅微粉2-3份、纳米炭黑0.5-1份、抗侵蚀剂ACAO 0.5-1份、防爆纤维0.1-0.15份、减水剂0.1-0.15份、六偏磷酸钠0.05份。
2.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述减水剂为ABC。
3.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述抗侵蚀剂为ACAO。
4.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述氧化铝微粉的成分:Al2O3>99.5%、Na2O<0.1%。
5.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述硅微粉的成分:SiO2>95%,pH值<4,D50<8微米。
6.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述纳米炭黑为N330型的固定碳,含量大于99%。
7.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述85高铝料的成分:氧化铝≥85%、氧化铁0-1.8%、氧化钾与氧化钠的合量0-0.4%。
8.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述自立板状板刚玉的成分:氧化铝≥99%、氧化铁0-0.03%。
9.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述电熔镁砂的成分:氧化镁≥96%、氧化钙0-1.8%以及氧化硅0-2.0%。
10.根据权利要求1所述的一种抗侵蚀铝镁浇注料,其特征在于,所述镁铝尖晶石的成分:氧化铝≥78%,氧化镁≥20%。
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