CN116535195A - 一种rh精炼炉用无铬镁铝尖晶石不烧砖及其制备方法 - Google Patents
一种rh精炼炉用无铬镁铝尖晶石不烧砖及其制备方法 Download PDFInfo
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- 239000011449 brick Substances 0.000 title claims abstract description 107
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 87
- 239000011029 spinel Substances 0.000 title claims abstract description 87
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000007670 refining Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 180
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 90
- 229910000449 hafnium oxide Inorganic materials 0.000 claims abstract description 49
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000011224 oxide ceramic Substances 0.000 claims abstract description 48
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- 238000003825 pressing Methods 0.000 claims abstract description 16
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- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 32
- 239000000843 powder Substances 0.000 claims description 21
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 19
- 239000007767 bonding agent Substances 0.000 claims description 19
- CJNBYAVZURUTKZ-UHFFFAOYSA-N hafnium(iv) oxide Chemical compound O=[Hf]=O CJNBYAVZURUTKZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 11
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 235000019580 granularity Nutrition 0.000 claims 11
- 229910004298 SiO 2 Inorganic materials 0.000 claims 1
- 238000004898 kneading Methods 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052751 metal Inorganic materials 0.000 abstract description 21
- 239000002184 metal Substances 0.000 abstract description 21
- 230000003628 erosive effect Effects 0.000 abstract description 15
- 230000035939 shock Effects 0.000 abstract description 11
- SRYXXFBEGKIORR-UHFFFAOYSA-N [O-2].[Y+3].[O-2].[Hf+4] Chemical compound [O-2].[Y+3].[O-2].[Hf+4] SRYXXFBEGKIORR-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052574 oxide ceramic Inorganic materials 0.000 abstract description 6
- 239000011819 refractory material Substances 0.000 abstract description 5
- 238000005272 metallurgy Methods 0.000 abstract description 2
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 abstract 1
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 23
- 239000010959 steel Substances 0.000 description 23
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- 238000000034 method Methods 0.000 description 7
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- 239000011651 chromium Substances 0.000 description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
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- 229910052804 chromium Inorganic materials 0.000 description 1
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- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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Abstract
本发明公开了一种RH精炼炉用无铬镁铝尖晶石不烧砖及其制备方法,属于冶金和耐火材料技术领域。所述无铬镁铝尖晶石不烧砖由粒度3~5mm98普通电熔镁砂20~25份、粒度1~3mm98普通电熔镁砂25~35份、粒度0~1mm98普通电熔镁砂20~25份、粒度≤0.074mm98普通电熔镁砂2~10份、粒度≤0.074mm烧结铝镁尖晶石8~12份、氧化钇稳定氧化铪陶瓷结合剂5~8份、结合剂2~3份,通过混练、机压成型、干燥等步骤制成。本发明避免了金属铝粉的加入,使用中不会产生体积膨胀,且氧化钇稳定氧化铪陶瓷结合剂在使用中形成氧化铪‑氧化钇陶瓷结构,使得无铬镁铝尖晶石不烧砖内部形成发达的组织结构,获得致密的烧结体。因此所制备的无铬镁铝尖晶石不烧砖具有优异的耐熔渣侵蚀性能、抗热震性能和高温性能。
Description
技术领域
本发明涉及冶金和耐火材料技术领域,更具体的说是涉及一种RH精炼炉用无铬镁铝尖晶石不烧砖及其制备方法。
背景技术
RH系统设备是一种用于生产优质钢的钢水二次精炼工艺装备。整个钢水冶金反应是在砌有耐火衬的真空槽内进行的。在过去几十年,超高温度烧成镁铬耐火材料是世界各地几乎唯一的RH真空冶炼设备炉衬耐火材料。
但是,在高温和碱性使用环境下,含Cr2O3耐火材料在氧化气氛与诸如Na2O、K2O或CaO等强碱性氧化物共同存在,Cr3+能氧化转变为Cr6+。Cr6+是一种致癌物,对人体有害且易溶于水;而且Cr2O3还可以以气相存在,在生产使用中随烟气排入空气中,污染空气环境;另外,K2CrO4、CaCrO4易溶于水,使用后的残砖中Cr6+顺雨水溶解,渗入地下会造成水环境污染。因此,近年来无铬耐火材料开发工作受到普遍的重视,针对RH精炼炉内衬无铬的镁铝尖晶石砖基本分为高温烧成砖和不烧砖。镁铝尖晶石高温烧成砖是1700℃左右高温烧成的烧成耐火制品,其能耗高,且受制于主体原材料电熔镁砂和镁铝尖晶石,不易使砖体组织充分烧结,难以获得发达的组织结构。镁铝尖晶石不烧砖虽然有工艺简单,能耗低等优势,但是,其也面临着在使用温度下(约1600~1650℃)砖坯很难形成良好的结合强度的问题。
目前,为了使镁铝尖晶石不烧砖在使用温度下(约1600~1650℃)形成良好的砖坯烧结强度,会加入一定量的金属铝粉,如专利CN111763076A。虽然金属铝粉在600~800℃下形成液相,能促进砖坯烧结。但是,铝粉的加入存在如下缺点:1.金属铝粉在混练过程中易燃易爆,有一定的危险性。2.金属铝为活泼金属,高温下容易氧化形成的Al2O3,这种Al2O3具有很高的细度,活性高,会与砖坯的MgO反应生成镁铝尖晶石,过程伴随着约7%的体积膨胀,引起结构疏松,使不烧砖坯体积密度降低,气孔率增大,很难获得强度良好致密的烧结体。RH精炼炉在精炼钢水时,钢水循环冲刷、渣液侵蚀、温度骤变造成耐火砖的损毁,从而导致不烧砖低龄下线。
因此,提供一种不加金属铝粉,且具有优异抗熔渣侵蚀性能、抗热震性能和高温性能的无铬镁铝尖晶石不烧砖和其制备方法是本领域技术人员亟需解决的问题。
发明内容
有鉴于此,本发明目的是提供一种含有氧化钇稳定氧化铪陶瓷结合剂的RH精炼炉用无铬镁铝尖晶石不烧砖及其制备方法,其在使用温度下(约1600~1650℃)不会发生体积膨胀,且其内部能形成氧化铪-氧化钇陶瓷结构,具有抗熔渣侵蚀性能优异、抗热震性能优异和高温性能优异的特点。
为了实现上述目的,本发明采用如下技术方案:
一种RH精炼炉用无铬镁铝尖晶石不烧砖,由下述质量份数的原料制备而成:粒度3~5mm 98普通电熔镁砂20~25份、粒度1~3mm 98普通电熔镁砂25~35份、粒度0~1mm 98普通电熔镁砂20~25份、粒度≤0.074mm 98普通电熔镁砂2~10份、粒度≤0.074mm烧结铝镁尖晶石8~12份、氧化钇稳定氧化铪陶瓷结合剂5~8份、结合剂2~3份。
其有益效果在于:本发明用氧化钇稳定氧化铪陶瓷结合剂替换金属铝粉,不仅生产上更加安全,而且其在高温使用过程中不会发生熔融氧化的金属铝粉与砖坯中MgO的反应,进而不会造成7%的体积膨胀,不会导致不烧砖的体积密度降低、显气孔率升高,钢水和钢渣也就不容易沿着气孔通道的渗透和侵蚀镁铝尖晶石砖。而且由于使用了氧化钇稳定氧化铪陶瓷结合剂,所制备的镁铝尖晶石砖在高温使用时,会产生陶瓷结合,砖坯1550℃*3h永久线变化极小,砖坯具有良好的体积密度和显气孔率,同时氧化钇稳定氧化铪陶瓷结合剂还能封闭砖坯的钢水和钢渣的渗透和侵蚀通道,从而提高了RH无铬镁尖晶石砖的抗钢水和钢渣的渗透和侵蚀。
所述氧化钇稳定氧化铪陶瓷结合剂包括氧化钇粉末和氧化铪粉末;所述氧化钇粉末和氧化铪粉末的质量比10~20:80~90。
所述氧化钇稳定氧化铪陶瓷结合剂还包括氧化铝微粉;所述氧化铝微粉、氧化钇粉末、氧化铪粉末的质量比为5~15:10~15:75~80。
所述氧化钇稳定氧化铪陶瓷结合剂的制备方法如下:将原料按比例投放入氧化铝内衬的球磨机中,干磨5~8h。
其有益效果在于:氧化钇稳定氧化铪陶瓷结合剂在使用中会形成氧化铪-氧化钇陶瓷结构,氧化铝微粉作为氧化钇稳定氧化铪的烧结剂,会提升氧化钇和氧化铪的活性,促进氧化铪-氧化钇陶瓷结构的形成,使RH无铬镁铝尖晶石不烧砖内形成发达的组织结构,获得致密的烧结体。使RH无铬镁尖晶石砖的高温热态强度增加,从而提高了RH无铬镁铝尖晶石砖的抗钢水冲刷性能和温度骤变情况下的抗热震稳定性能。
所述结合剂为液体酚醛树脂。
本发明的目的还在于提供一种RH精炼炉用无铬镁铝尖晶石不烧砖的制备方法,制备方法如下:
根据质量份数比例称量粒径3~5mm 98普通电熔镁砂、粒径1~3mm 98普通电熔镁砂、粒径0~1mm 98普通电熔镁砂、粒径≤0.074mm 98普通电熔镁砂、粒径≤0.074mm烧结铝镁尖晶石、氧化钇稳定氧化铪陶瓷结合剂,混合后投入行星式高速混练机内,进行低速混练;然后加入结合剂,进行高速混练,得到泥料;所得泥料通过机压成型、干燥后即得所述无铬镁铝尖晶石不烧砖。
所述低速混练的速度为60rpm,时间为3~6min;所述高速混练的速度为120rpm,时间为20~30min,温度为40~55℃。
所述机压成型的成型压力为850~1500KN,压制7~10次,得到的砖坯耐压强度为100~105Mpa,体积密度为3.18~3.20g/cm3。
所述干燥的温度为180~200℃,干燥时间为10~12h。
经由上述的技术方案可知,与现有技术相比,本发明提供了一种RH精炼炉用无铬镁铝尖晶石不烧砖及其制备方法,通过氧化钇稳定氧化铪陶瓷结合剂的使用,具体产生了如下有益效果:
(1)本发明将现有技术中无铬镁铝尖晶石不烧砖原料中金属铝粉替换为氧化钇稳定氧化铪陶瓷结合剂,避免了金属铝粉导致的体积膨胀,提高了体积密度,降低了气孔率,封闭了钢水和钢渣的渗透和侵蚀通道。同时,氧化钇稳定氧化铪形成氧化铪-氧化钇陶瓷结构,使无铬镁铝尖晶石不烧砖内形成发达的组织结构,获得致密烧结体,使RH无铬镁尖晶石不烧砖的高温热态强度增加,从而提高了其抗钢水冲刷性能和温度骤变情况下的抗热震稳定性能。
(2)在使用中氧化钇和氧化铪与渗入的熔渣反应,生成复杂的高温相,抑制了熔渣反应渗透,且由于吸收了渣中的CaO,降低了熔渣的碱度,增加了熔渣的粘度,熔渣与砖体润湿角增大,从而使熔渣渗透的粘性流动阻力变大,抑制了熔渣的渗透,从而提高RH无铬镁铝尖晶石砖的抗熔渣侵蚀和渗透性能。
(3)本发明的无铬镁铝尖晶石不烧砖具有优异的耐熔渣侵蚀性能、优异的抗热震性能、优异的高温性能,其1600℃静态坩埚法抗渣实验侵蚀指数为3%~8%,渗透指数为5~10%;1600℃*30min热态下抗折强度为25~38Mpa;1100℃*20min空气急冷10次残余耐压强度为65~85Mpa;1550℃*3h加热永久线变化为0.2%~0.45%。
(4)本发明所制备的无铬镁铝尖晶石不烧砖实际应用中平均寿命长,能提高RH精炼炉使用率,降低平均成本。
具体实施方式
下面对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明实施例公开了一种RH精炼炉用无铬镁铝尖晶石不烧砖及其制备方法,所用原料要求如下:
其中所有粒径的98普通电熔镁砂均要求MgO含量>98%,SiO2含量<1.0%,余量为杂质。烧结铝镁尖晶石中Al2O3含量为76%~78%,MgO含量为18%~22%,余量为杂质。结合剂为液体酚醛树脂,要求为残碳值≥40%,水分≤3.0%,粘度为16000cp~19000cp。氧化铝微粉纯度>99%,粒径为2~3μm;氧化钇粉末纯度>99%,粒径为45μm;氧化铪粉末纯度>99%,粒径为45μm。粒径≤0.074mm金属铝粉要求纯度≥98%。
实施例1
按质量比5:15:80取氧化铝微粉、氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨6小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂6.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂5份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度40℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力850KN,压制10次,得到的砖坯耐压强度为100Mpa,体积密度为3.18g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
实施例2
按质量比5:15:80取氧化铝微粉、氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨6小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂3.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂8份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度55℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力1500KN,压制7次,得到的砖坯耐压强度为105Mpa,体积密度为3.20g/cm3。在干燥窑中200℃干燥10h,即得无铬镁铝尖晶石不烧砖。
实施例3
按质量比5:15:80取氧化铝微粉、氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨5小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数取粒径3~5mm 98普通电熔镁砂20份、粒径1~3mm 98普通电熔镁砂35份、粒径0~1mm 98普通电熔镁砂20份、粒径≤0.074mm 98普通电熔镁砂6.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂6份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度50℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力1000KN,压制7次,得到的砖坯耐压强度为103Mpa,体积密度为3.19g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
实施例4
按质量比5:15:80取氧化铝微粉、氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨8小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数比例取粒径3~5mm 98普通电熔镁砂25份、粒径1~3mm 98普通电熔镁砂25份、粒径0~1mm 98普通电熔镁砂25份、粒径≤0.074mm 98普通电熔镁砂5.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂7份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度45℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力900KN,压制10次,得到的砖坯耐压强度为101Mpa,体积密度为3.19g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
实施例5
按质量比10:15:75取氧化铝微粉、氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨7时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数比例取粒径3~5mm 98普通电熔镁砂25份、粒径1~3mm 98普通电熔镁砂25份、粒径0~1mm 98普通电熔镁砂25份、粒径≤0.074mm 98普通电熔镁砂5.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂7份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度45℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力900KN,压制10次,得到的砖坯耐压强度为102Mpa,体积密度为3.19g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
实施例6
按质量比15:10:75取氧化铝微粉、氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨6小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂3.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂8份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度55℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力1500KN,压制7次,得到的砖坯耐压强度为104Mpa,体积密度为3.20g/cm3。在干燥窑中200℃干燥10h,即得无铬镁铝尖晶石不烧砖。
实施例7
按质量比20:80取氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨6小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂6.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂5份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度45℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力850KN,压制10次,得到的砖坯耐压强度为100Mpa,体积密度为3.18g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
实施例8
按质量比10:90取氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨7小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂6.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂5份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度45℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力950KN,压制10次,得到的砖坯耐压强度为102Mpa,体积密度为3.19g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
实施例9
按质量比15:85取氧化钇粉末、氧化铪粉末投放入氧化铝内衬的球磨机中,物料在球磨机中干磨6小时后,即得氧化钇稳定氧化铪陶瓷结合剂。
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂6.5份、粒径≤0.074mm烧结铝镁尖晶石10份、氧化钇稳定氧化铪陶瓷结合剂5份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度45℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力1000KN,压制7次,得到的砖坯耐压强度为103Mpa,体积密度为3.19g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
为更好的体现本申请的优异性能,设置了对比例,对比例中原料要求与实施例相同。
对比例1
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂9.5份、粒径≤0.074mm烧结铝镁尖晶石10份、粒径≤0.074mm金属铝粉2份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度40℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力850KN,压制10次,得到的砖坯耐压强度为99Mpa,体积密度为3.18g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
对比例2
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂7.5份、粒径≤0.074mm烧结铝镁尖晶石10份、粒径≤0.074mm金属铝粉4份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度55℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力1500KN,压制7次,得到的砖坯耐压强度为104Mpa,体积密度为3.19g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
对比例3
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂6.5份、粒径≤0.074mm烧结铝镁尖晶石10份、粒径≤0.074mm金属铝粉5份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度40℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力900KN,压制10次,得到的砖坯耐压强度为101Mpa,体积密度为3.18g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
对比例4
按质量份数比例取粒径3~5mm 98普通电熔镁砂23份、粒径1~3mm 98普通电熔镁砂30份、粒径0~1mm 98普通电熔镁砂23份、粒径≤0.074mm 98普通电熔镁砂10份、粒径≤0.074mm烧结铝镁尖晶石11.5份,混合后投入行星式高速混练机内,以60rpm速度混练5min时间;然后加入2.5份结合剂,以120rpm速度混练25min时间,温度40℃,得到泥料;取所得泥料通过电动液压压砖机高压成型,成型压力1000KN,压制10次,得到的砖坯耐压强度为104Mpa,体积密度为3.20g/cm3。在干燥窑中180℃干燥12h,即得无铬镁铝尖晶石不烧砖。
性能检验:
按GB/T 3002-2004进行热态抗折强度(Mpa)检测,按GB/T 8931-2007进行抗渣侵蚀检测,按YB/T 376.1-1995进行热震性能检测,耐压强度按GB/T5072-2008进行耐压强度检测,1550℃*3h加热永久线变化按GB/T 5988-2007进行1550℃*3h线变化检测,检测结果见表1与表2。
表1实施例1-9成品RH精炼炉用无铬镁铝尖晶石不烧砖检测数据
表2对比例1-4成品RH精炼炉用无铬镁铝尖晶石不烧砖检测数据
通过对比表1和表2数据可知,不加金属铝粉的无铬镁铝尖晶石不烧砖不易烧结,其耐炉渣侵蚀性和渗透性、抗热震性能、高温性能都比较差。添加金属铝粉后其耐炉渣侵蚀性和渗透性、抗热震性能、高温性能都有所提升,但是其1550℃*3h永久线变化率增大,表明其使用中会发生较大的体积膨胀。将金属铝粉替换为氧化钇稳定氧化铪陶瓷结合剂后,其耐炉渣侵蚀性和渗透性、抗热震性能、高温性能进一步提升,1550℃*3h加热永久线变化发生了明显的下降,甚至低于未加入金属铝粉组。其原因是:氧化钇稳定氧化铪陶瓷结合剂的使用,避免了金属铝粉导致的体积膨胀,提高了体积密度,降低了气孔率,封闭了钢水和钢渣的渗透和侵蚀通道。同时,氧化钇稳定氧化铪形成氧化铪-氧化钇陶瓷结构,使无铬镁铝尖晶石不烧砖内形成发达的组织结构,获得致密烧结体,使RH无铬镁尖晶石不烧砖的高温热态强度增加,从而提高了其抗钢水冲刷性能和温度骤变情况下的抗热震稳定性能。另外,氧化钇稳定氧化铪陶瓷结合剂原料中加入氧化铝微粉后其性能会进一步提升,原因是氧化铝微粉作为氧化钇稳定氧化铪的烧结剂,能提高氧化钇和氧化铪的活性。
实际应用实验:
按上述实施例2原料比例制备RH无铬镁铝尖晶石不烧砖,应用于鞍钢某分厂180吨RH精炼炉进行试验。
具体步骤如下:
砌筑:将RH无铬镁铝尖晶石不烧砖,按照设计图纸要求的层数、位置砌筑在RH精炼炉下部槽的中,其中包壁RH无铬镁尖晶石砖每隔10块砖竖缝相错放置1张1mm黄板纸;
烘烤:根据钢厂烘烤的火焰长度分为小火24小时—中火24小时—大火24小时,共计72小时后上线使用。
本实施例所制得RH精炼炉用高性能无铬镁铝尖晶石不烧砖在鞍钢某分厂某180吨RH精炼炉下部槽进行实际应用,平均寿命在380次。现有技术的RH精炼炉无铬镁铝尖晶石不烧砖平均使用寿命在320次,本发明的RH精炼炉无铬镁铝尖晶石不烧砖寿命明显高于现有技术。
对所公开的实施例的上述说明,使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的,本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下,在其它实施例中实现。因此,本发明将不会被限制于本文所示的这些实施例,而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。
Claims (10)
1.一种RH精炼炉用无铬镁铝尖晶石不烧砖,其特征在于,由下述质量份数的原料制备而成:粒度3~5mm 98普通电熔镁砂20~25份、粒度1~3mm 98普通电熔镁砂25~35份、粒度0~1mm 98普通电熔镁砂20~25份、粒度≤0.074mm 98普通电熔镁砂2~10份、粒度≤0.074mm烧结铝镁尖晶石8~12份、氧化钇稳定氧化铪陶瓷结合剂5~8份、结合剂2~3份。
2.根据权利要求1所述的RH精炼炉用无铬镁铝尖晶石不烧砖,其特征在于,所述氧化钇稳定氧化铪陶瓷结合剂原料包括氧化钇粉末和氧化铪粉末;所述氧化钇粉末和氧化铪粉末的质量比为10~20:80~90。
3.根据权利要求2所述的RH精炼炉用无铬镁铝尖晶石不烧砖,其特征在于,所述氧化钇稳定氧化铪陶瓷结合剂原料还包括氧化铝微粉;所述氧化铝微粉和氧化钇粉末、氧化铪粉末的质量比为5~15:10~15:75~80。
4.根据权利要求2或3所述的RH精炼炉用无铬镁铝尖晶石不烧砖,其特征在于,所述氧化钇稳定氧化铪陶瓷结合剂的制备方法如下:将氧化钇稳定氧化铪陶瓷结合剂原料按比例投放入氧化铝内衬的球磨机中,干磨5~8h。
5.根据权利要求1所述的RH精炼炉用无铬镁铝尖晶石不烧砖,其特征在于,所述的不同粒度的98普通电熔镁砂均要求其成分中MgO含量>98%,SiO2含量<1.0%,余量为杂质;所述烧结铝镁尖晶石中Al2O3含量为76%~78%,MgO含量为18%~22%,余量为杂质。
6.根据权利要求1所述的RH精炼炉用无铬镁铝尖晶石不烧砖,其特征在于,所述结合剂为液体酚醛树脂。
7.一种RH精炼炉用无铬镁铝尖晶石不烧砖的制备方法,其特征在于,制备方法如下:
根据权利要求1中的质量份数比例称量粒度3~5mm 98普通电熔镁砂、粒度1~3mm 98普通电熔镁砂、粒度0~1mm 98普通电熔镁砂、粒度≤0.074mm98普通电熔镁砂、粒度≤0.074mm烧结铝镁尖晶石、氧化钇稳定氧化铪陶瓷结合剂进行混合,然后低速混练;低速混练完成后加入结合剂进行高速混练,得到泥料;所得泥料通过机压成型、干燥后即得所述无铬镁铝尖晶石不烧砖。
8.根据权利要求7所述RH精炼炉用无铬镁铝尖晶石不烧砖的制备方法,其特征在于,所述低速混练的速度为60rpm,时间为3~6min;所述高速混练的速度为120rpm,时间为20~30min,温度为40~55℃。
9.根据权利要求7所述RH精炼炉用无铬镁铝尖晶石不烧砖的制备方法,其特征在于,所述机压成型的成型压力为850~1500KN,压制7~10次。
10.根据权利要求7所述RH精炼炉用无铬镁铝尖晶石不烧砖的制备方法,其特征在于,所述干燥的温度为180~200℃,干燥时间为10~12h。
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