CN1061962C - 高炉铁口堵口泥 - Google Patents

高炉铁口堵口泥 Download PDF

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CN1061962C
CN1061962C CN95106751A CN95106751A CN1061962C CN 1061962 C CN1061962 C CN 1061962C CN 95106751 A CN95106751 A CN 95106751A CN 95106751 A CN95106751 A CN 95106751A CN 1061962 C CN1061962 C CN 1061962C
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blast furnace
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陈炳庆
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Baoshan Iron and Steel Co Ltd
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Abstract

本发明提供了一种高炉铁口堵口泥，其原料配比(wt%)为：高铝刚玉40～60，Si3N4结合SiC15～30，焦粉7～12，软质粘土7～10，蓝晶石3～7，焙烧氧化铝微粉3～6，上述总的原料粒度组成(wt%)为:5～1mm的粗料占35～45，1mm～120的中粒度料占8～12，小于0.124mm的细粉占45～55，粘结剂为上述干料总量的15～20wt%的焦油，该堵口泥氧化铝含量可达55～65%，杂质减少，原料中去除了铁，使其高温结构强度和高温体积稳定性提高，出铁时间延长。

Description

高炉铁口堵口泥
本发明涉及一种氧化铝为基的不定形耐火材料，可用于高炉炼铁铁口堵口泥炮用炮泥。
随着高炉向大型化、自动化、高冶炼强度方向发展，采用高压操作，高炉不设渣口，炉内的铁水和炉渣一起通过铁口排放，铁口堵口用泥的性能在一定程度上左右着高炉的操作指标，现有的铁口堵口泥用棕刚玉、碳化硅和焦粉为主原料，以软质粘土、绢云母为结合剂，SiO2含量高，制品的主晶体和基体强度相对较差，耐蚀性和抗冲刷能力不理想，高炉出铁时间短，每天出铁次数多。为减少粘土用量，日本专利申请平1-13108公开了一种“高炉出铁口用泥料”，是用20％以下的氮化硅铁、30％的焙烧铝钒土，5～25％的碳、5～15％的高岭土粘土和其他耐火材料以焦油为粘结剂得到的，该炮泥由于氮化硅铁中含有铁，会影响炮泥的抗侵蚀能力，同时焙烧铝钒土中杂质含量高、纯度低也会对性能有所影响。
为实现上述目的，本发明是这样实现的：
一种高炉出铁口堵口泥，其成份(wt)为：高铝刚玉40～60％，Si3N4结合SiC 15～30％，焦粉7～12％，软质粘土7～10％，兰晶石3～7％，焙烧氧化铝微粉3～6％，上述总的原料粒度组成为：5～1mm的粗料占35～45％，1mm～120目(0.124mm)的中粒度料占8～12％，-120目(小于0.124mm)的细粉占45～55％，以及上述干料总量的15～20wt％焦油沥青为粘结剂。
该堵口泥原料的粒度组成为：高铝刚玉：5～1mm占35～45wt％，1mm～120目占5～10wt％，-120目占45～55wt％，Si3N4结合SiC∶3～1mm占45～55wt％，1mm～120目(0.124mm)占5～10wt％，-120目(小于0.124mm)的占45～55wt％。
下面对本发明进行详述。
本发明采用高铝刚玉、Si3N4结合SiC和焦粉为主要原料，用软质粘土、兰晶石和焙烧氧化铝微粉为结合剂，通过强化骨料，提高原料纯度，使构成制品结构主体的主晶体为高熔点晶相，使制品的高温结构强度和高温体积稳定性提高，体积密度增大、气孔率降低，以提高其抗机械冲刷、耐化学侵蚀能力。下面分别介绍各组分的作用：
高铝刚玉：40～60wt％，粒度组成为：5～1mm占35～45wt％，1mm～120目(0.124mm)的占5～10wt％，-120目(小于0.124mm)占45～55wt％，其生产工艺与棕刚玉基本相同，Al2O3含量高，其化学成份和物理性能接近白刚玉，利用其硬度高、重度大、致密、气孔率低、高温性能稳定，抗渣侵蚀性好等特点，随着Al2O3含量的增加，液相数量减少，抗炉渣侵蚀性能显著提高。
Si3N4结合SiC∶15～30wt％，粒度组成为：3～1mm占45～55wt％，1mm～120目(0.124mm)占5～10wt％，-120目(小于0.124mm)占45～55wt％，该物质是由碳化硅加金属硅进行氮化处理得到，其中Si3N4∶SiC约为1∶2，具有很高的硬度，良好的抗酸、碱侵蚀性，耐磨性和抗热震稳定性；与现有技术中加入氮化硅铁相比，由于Si3N4结合SiC的存在，且SiC在高温下很稳定，Si3N4中的N可更好地与粘土反应，有利于提高堵口泥的致密性和耐侵蚀性。
焦粉：7～12wt％，粒度≤1mm，这是一种不易浸润的物质，也不易被侵蚀和冲刷。
铁口堵口泥的抗氧化(渣、铁的侵蚀、浸透和渗透)的能力与气孔率和体积密度有关，渣铁通过气孔侵蚀，使结构破坏。气孔率低、体积密度大，则抗氧化能力强。本发明采用软质粘土加入氧化铝微粉、兰晶石做为结合剂，可减少气孔率，其中：
兰晶石：3～7wt％，粒度120～200目(0.124～0.076mm)，当堵口泥在铁口中温度上升到1300～1450℃时，兰晶石体积膨胀可达16～18％，并稳定下来，温度下降也不收缩，刚好充填泥料本身产生的收缩。
焙烧氧化铝微粉：3～6wt％，粒度小于5um占80％，加入该组分可与兰晶石的热膨胀一起，填补由于软质粘土在高温下体积收缩所出现的气孔，提高密度。
同时，该成份中5～1mm粗粒∶1mm～120目(0.124mm)的中等粒度：-120目(小于0.124mm)的细粉的组成为35～45∶8～1 2∶45～55，同时将最大粒度由3mm提高到5mm，可提高原料的致密性，减少气孔率。
粘结剂为上述干料总量的15～20wt％的焦油沥青。
与现有技术相比，本发明采用性能优良的高铝刚玉和Si3N4结合SiC为主要原料，并使用软质粘土、兰晶石和焙烧氧化铝微粉组成的结合剂，氧化铝含量提高，达到55～65％，杂质减少，原料中去除了铁，使铁口堵口泥的体积密度、显气孔率、抗折强度等物理性能，抗炉渣化学侵蚀和机械冲刷能力有较大提高，出铁时不生成低熔点物质，出铁口不易扩大。在高炉上使用本发明堵口泥作业后，出铁时间延长，日平均出铁次数由15次以上减少到9次，每吨铁的炮泥消耗量由0.8kg降低到0.4kg，炉前作业条件明显改善。
下面介绍本发明的实施例。
将该高炉出铁口堵口泥所需成份配料具体成份如表1示，先加粗料、后加细料在碾泥机内混练40～60分钟，焦油沥青分两次加入，经练泥机挤压排出成圆柱状泥柱，成为大型高炉出铁口堵口泥。表1给出了本发明和对比例成份和性能的对比。
表1
    本发明 对比例
1  2  3  4  1  2
    原料配比(重量％) 高铝刚玉 40  45  55  60
棕刚玉 42  40
碳化硅 18  15
氮化硅 5
氮化硅结合碳化硅 30  25  20  15
焦粉 7  10  8  12  11  11
粘土 10  10  9  7  13  13
氧化铝微粉 6  5  4  3
兰晶石 7  5  4  3
绢云母 16  16
焦油沥青 20  18  17  15  20  20
    物性值 体积密度(g/m3) 2.26  2.30  2.33  2.40  1.98  2.01
显气孔率(％) 25.5  26.0  26.0  25 6  30.3  30.0
抗折强度(MPa) 3．01  2.93  2.23  2.10  0.41  1．05
抗压强度(MPa) 7．56  7.82  6.87  6.85  6.20  5.15
抗渣性(％) 52  55  60  65  100  70

Claims (1)

1.一种高炉铁口堵口泥，其特征是：其原料配比为：高铝刚玉40～60wt％，Si3N4结合SiC 15～30wt％，焦粉7～12wt％，软质粘土7～10wt％，兰晶石3～7wt％，焙烧氧化铝微粉3～6wt％，上述总的原料粒度组成为：5～1mm的粗料占35～45％，1mm～0.124mm的中料占8～12％，小于0.124mm的细粉占45～55wt％，以及上述干料总量的15～20wt％焦油。
CN95106751A 1995-06-23 1995-06-23 高炉铁口堵口泥 Expired - Fee Related CN1061962C (zh)

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Publication number Priority date Publication date Assignee Title
CN1075475C (zh) * 1996-11-29 2001-11-28 王明贤 中型高炉用无水耐火炮泥
CN100410209C (zh) * 2005-11-25 2008-08-13 首钢总公司 鱼雷罐内衬修补浇注料
CN100398486C (zh) * 2006-12-15 2008-07-02 郑州真金耐火材料有限责任公司 硅莫耐磨复合砖
CN101736107B (zh) * 2010-01-14 2011-06-01 山西太钢不锈钢股份有限公司 一种高炉捅风口方法
CN102775155A (zh) * 2011-05-10 2012-11-14 三和耐火工业股份有限公司 出铁口堵泥
CN108794030A (zh) * 2018-08-06 2018-11-13 邵珠航 一种钢铁冶炼用堵口泥及其制备方法

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Publication number Priority date Publication date Assignee Title
JPH1013108A (ja) * 1996-06-21 1998-01-16 Nec Eng Ltd 抵抗減衰装置

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Publication number Priority date Publication date Assignee Title
JPH1013108A (ja) * 1996-06-21 1998-01-16 Nec Eng Ltd 抵抗減衰装置

Non-Patent Citations (1)

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Title
《耐火材料应用》 1986.1.1 冶金工业出版社 *

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