CN110143807A - 一种钢包渣线用金属复合低碳镁碳砖及其制备方法 - Google Patents
一种钢包渣线用金属复合低碳镁碳砖及其制备方法 Download PDFInfo
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- 239000011449 brick Substances 0.000 title claims abstract description 45
- 239000002893 slag Substances 0.000 title claims abstract description 30
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- QSFCOQHTMWHHJO-UHFFFAOYSA-N [C].[Mg].[C] Chemical compound [C].[Mg].[C] QSFCOQHTMWHHJO-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 128
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 64
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 28
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 19
- 239000010439 graphite Substances 0.000 claims abstract description 19
- 229920000914 Metallic fiber Polymers 0.000 claims abstract description 15
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000005011 phenolic resin Substances 0.000 claims abstract description 6
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 19
- 238000003723 Smelting Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 12
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 10
- 239000011812 mixed powder Substances 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000012163 sequencing technique Methods 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 3
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000004898 kneading Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 18
- 239000010959 steel Substances 0.000 abstract description 18
- 239000011819 refractory material Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 3
- 230000007306 turnover Effects 0.000 abstract description 3
- KGRVJHAUYBGFFP-UHFFFAOYSA-N 2,2'-Methylenebis(4-methyl-6-tert-butylphenol) Chemical compound CC(C)(C)C1=CC(C)=CC(CC=2C(=C(C=C(C)C=2)C(C)(C)C)O)=C1O KGRVJHAUYBGFFP-UHFFFAOYSA-N 0.000 abstract 1
- 235000006708 antioxidants Nutrition 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910017083 AlN Inorganic materials 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 2
- 229910000632 Alusil Inorganic materials 0.000 description 2
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
本发明涉及耐火材料技术领域，尤其涉及一种钢包渣线用金属复合低碳镁碳砖及其制备方法。一种钢包渣线用金属复合低碳镁碳砖包括以下重量百分比的原料：镁砂细粉20～28％；酚醛树脂1.5～4.5％；天然鳞片石墨0～6％；膨胀石墨0.5～5％；金属纤维0.1～5％；抗氧化剂1～5％。大大增强了镁碳砖抗氧化性和抗渣性能，并且镁碳砖的高温强度和抗热震性有了明显的提高，满足洁净钢、超低碳钢冶炼的需要，镁碳砖的使用寿命较以前的渣线镁碳砖有大幅提高，从而提高了钢包的周转率，降低了生产成本。
Description
技术领域
本发明涉及耐火材料技术领域，尤其涉及一种钢包渣线用金属复合低碳镁碳砖及其制备方法。
背景技术
在耐火技术快速发展的21世纪，优质品种钢的需求大大增加，钢铁企业也需要进行结构调整使得优质品种钢成为企业的主导产品，如：优合金钢、超低碳钢、洁净钢、高强度钢等钢种的比例逐年增加。钢铁工业发展洁净钢对炉外精炼钢包用耐火材料尤其是对渣线砖提出更高要求，不仅要求较长的使用寿命，还要求少污染、不污染钢水，而优质品种钢在冶炼过程中要求严格控制耐火材料中的碳含量，以降低对钢水的增碳，且在二次精炼中钢水温度提高和下降幅度要小，钢包衬的热导率要低更加符合钢铁工业对耐火材料的需求。
现用于钢包渣线的镁碳砖碳含量较高(一般12wt％～18wt％)，会造成钢水增碳等负面影响，而且砖内碳的氧化是镁碳砖损毁的最主要原因，会造成钢渣容易渗透侵蚀加剧，在低碳镁碳砖方面的研究大多还是关于结合剂和原料的一些研究，如：申请号为200710019767.9中国专利公开的“一种非氧化物复合低碳镁碳砖＂；申请号为200610046434.0中国专利公开的“含防氧化剂C—TiN复合粉体的镁碳砖及其生产方法”；申请号为99107800.4中国专利公开的“含碳耐火材料的抗氧化剂＂。
发明内容
本发明提供了一种钢包渣线用金属复合低碳镁碳砖及其制备方法，用来为克服上述现有技术的不足之处，并且在性能方面做出提高：大大增强其抗氧化性和抗渣性能，并且高温强度和抗热震性有了明显的提高，还可以满足洁净钢、超低碳钢冶炼的需要。
本发明技术方案实现如下：
一种钢包渣线用金属复合低碳镁碳砖，包括以下重量百分比的原料：
所述金属纤维采用普通纤维或不锈钢纤维。
所述天然鳞片石墨为天然碳含量为90～98wt％，粒度≤0.15mm。
所述抗氧化剂为Al粉，Si粉，AlMg合金粉或SiC粉的一种或任意两种以上的混合物，粒度小于0.088mm。
所述镁砂颗粒采用烧结或电熔MgO，包括5～3mm、3～1mm和<1mm的三种粒度级别的MgO。
所述镁砂细粉为粒度≤0.088mm的烧结或电熔MgO。
一种钢包渣线用金属复合低碳镁碳砖的制备方法，具体包括如下步骤：
(1)对部分电熔镁砂进行破碎，然后筛分得到粒度为5～3mm、3～l mm和<l mm的三种镁砂颗粒；
(2)将破碎、筛分完的部分镁砂颗粒细磨为粒度≤0.088mm的镁砂细粉；
(3)取1～5wt％的AlMg合金粉为抗氧化剂，再与20～27wt％的镁砂细粉一起混合均匀，成混合粉；
(4)按配比要求将各种不同粒度的镁砂颗粒分别计量后，将占58～66wt％的镁砂颗粒、上述混合粉、0.5～3wt％的膨胀石墨、3～6wt％的天然鳞片石墨以此先后顺序加入到高速混炼机中进行低速混炼1～2分钟，再加1.5～4.5wt％的酚醛树脂低速混炼1～2分钟，制成泥料；
(5)再向高速混炼机中的泥料中加入0.1～5wt％的金属纤维，高速混炼8～10分钟，使金属纤维均匀分布在泥料中，金属纤维为不锈钢纤维；
(6)混炼銡束后从高速混炼机中放出泥料，在复合式摩擦压砖机中打击成型形成砖坯，打击过程中每个砖坯打击最大受力在1.0t～3t/cm2之间不低于5次，成型后砖坯密度为2.80～3.25g/cm3；
(7)成型的砖坯经过50～300℃的温度干燥后即可制成低碳镁碳砖。
与现有技术相比，本发明的有益效果是：
在生产精炼钢包渣线镁碳砖时采用不同粒度石墨复合加入的方式以降低碳含量，也有利于降低镁碳砖在间歇性使用过程中由于石墨氧化而带来的强度下降幅度；同时还引入铝硅合金、氮化铝细粉和碳化物，有利于镁碳砖抗侵蚀性、抗热震性和抗氧化性的提高。
实际应用表明，研制的低碳镁碳砖使用寿命较以前的渣线镁碳砖有大幅提高，从而提高了钢包的周转率，降低了生产成本。
具体实施方式
下面对本发明的具体实施方式作进一步说明，但不用来限制本发明的范围：
一种钢包渣线用金属复合低碳镁碳砖，包括以下重量百分比的原料：
所述金属纤维采用普通纤维或不锈钢纤维。
所述天然鳞片石墨为天然碳含量为90wt％～98wt％，粒度≤0.15mm。
所述抗氧化剂为Al粉，Si粉，AlMg合金粉或SiC粉的一种或任意两种以上的混合物，粒度小于0.088mm。
所述镁砂颗粒采用烧结或电熔MgO,包括5～3mm、3～1mm和<1mm的三种粒度级别的MgO。
所述镁砂细粉为粒度≤0.088mm的烧结或电熔MgO。
一种钢包渣线用金属复合低碳镁碳砖的制备方法，具体包括如下步骤：
(1)对部分电熔镁砂进行破碎，然后筛分得到粒度为5～3mm、3～lmm和<lmm的三种镁砂颗粒，
(2)将破碎、筛分完的部分镁砂颗粒细磨为粒度≤0.088mm的镁砂细粉；
(3)取1～5wt％的AlMg合金粉为抗氧化剂，再与20～27wt％的镁砂细粉一起混合均匀，成混合粉；
(4)按配比要求将各种不同粒度的镁砂颗粒分别计量后，将占58～66wt％的镁砂颗粒、上述混合粉、0.5～3wt％的膨胀石墨、3～6wt％的天然鳞片石墨以此先后顺序加入到高速混炼机中进行低速混炼1～2分钟，再加1.5～4.5wt％的酚醛树脂低速混炼1～2分钟，制成泥料；
(5)再向高速混炼机中的泥料中加入0.1～5wt％的金属纤维，高速混炼8～10分钟，使金属纤维均匀分布在泥料中，金属纤维为不锈钢纤维；
(6)混炼銡束后从高速混炼机中放出泥料，在复合式摩擦压砖机中打击成型形成砖坯，打击过程中每个砖坯打击最大受力在1.0t～3t/cm2之间不低于5次，成型后砖坯密度为2.80～3.25g/cm3；
(7)成型的砖坯经过50～300℃的温度干燥后即可制成低碳镁碳砖。
实施例：
当冶炼钢种要求低碳镁碳砖的碳含量为2～5％时，采用只加入单一膨胀石墨的制备方法，原料加入比例为：64～70wt％的镁砂颗粒、23～28wt％的镁砂细粉、1～5wt％的抗氧化剂、2～5wt％的膨胀石墨、0.1～5wt％的金属纤维、1.5～4.5wt％的酚醛树脂。然后经以下步骤制得钢包渣线用金属复合低碳镁碳砖：
(1)对部分电容镁砂进行破碎，然后筛分得到粒度为5～3mm、3～lmm和<lmm的三种镁砂颗粒，
(2)将破碎、筛分完的部分镁砂颗粒细磨为粒度≤0.088mm的镁砂细粉；
(3)取1～5wt％的AlMg合金粉为抗氧化剂，再与20～27wt％的镁砂细粉一起混合均匀，成混合粉；
(4)按配比要求将各种不同粒度的镁砂颗粒分别计量后，将占58～66wt％的镁砂颗粒、上述混合粉、0.5～3wt％的膨胀石墨、3～6wt％的天然鳞片石墨以此先后顺序加入到高速混炼机中进行低速混炼1～2分钟，再加1.5～4.5wt％的酚醛树脂低速混炼1～2分钟，制成泥料；
(5)再向高速混炼机中的泥料中加入0.1～5wt％的金属纤维，高速混炼8～10分钟，使金属纤维均匀分布在泥料中，金属纤维为不锈钢纤维；
(6)混炼銡束后从高速混炼机中放出泥料，在复合式摩擦压砖机中打击成型形成砖坯，打击过程中每个砖坯打击最大受力在1.0t～3t/cm2之间不低于5次，成型后砖坯密度为2.80～3.25g/cm3；
(7)成型的砖坯经过50～300℃的温度干燥后即可制成低碳镁碳砖。
本实施例所制备的金属复合低碳镁碳砖检测结果为：显气孔率3.2％，体积密度3.08g/cm3，常温耐压强度70Mpa，1400℃埋碳高温抗折强度32.3Mpa，1500℃保温lh空气气氛下进行抗氧化实验，试样氧化层厚度3.5mm，1600℃保温3h埋碳气氛下进行抗渣实验，渣侵蚀和渗透不明显。
本发明在生产精炼钢包渣线镁碳砖时采用不同粒度石墨复合加入的方式以降低碳含量，也有利于降低镁碳砖在间歇性使用过程中由于石墨氧化而带来的强度下降幅度；同时还引入铝硅合金、氮化铝细粉和碳化物，有利于镁碳砖抗侵蚀性、抗热震性和抗氧化性的提高。实际应用表明，研制的低碳镁碳砖使用寿命较以前的渣线镁碳砖有大幅提高，从而提高了钢包的周转率，降低了生产成本。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。
Claims (7)
1.一种钢包渣线用金属复合低碳镁碳砖，其特征在于，包括以下重量百分比的原料：
2.根据权利要求1所述的一种钢包渣线用金属复合低碳镁碳砖，其特征在于，所述金属纤维采用普通纤维或不锈钢纤维。
3.根据权利要求1所述的一种钢包渣线用金属复合低碳镁碳砖，其特征在于，所述天然鳞片石墨为天然，碳含量为90～98wt％，粒度≤0.15mm。
4.根据权利要求1所述的一种钢包渣线用金属复合低碳镁碳砖，其特征在于，所述抗氧化剂为Al粉，Si粉，AlMg合金粉或SiC粉中的一种或任意两种以上的混合物，粒度小于0.088mm。
5.根据权利要求1所述的一种钢包渣线用金属复合低碳镁碳砖，其特征在于，所述镁砂颗粒采用烧结或电熔MgO，包括5～3mm、3～1mm和<1mm的三种粒度级别的MgO。
6.根据权利要求1所述的一种钢包渣线用金属复合低碳镁碳砖，其特征在于，所述镁砂细粉为粒度≤0.088mm的烧结或电熔MgO。
7.一种权利要求1所述的钢包渣线用金属复合低碳镁碳砖的制备方法，其特征在于，具体包括如下步骤：
1)对电熔镁砂进行破碎，然后筛分得到粒度为5～3mm、3～l mm和<l mm的三种镁砂颗粒；
2)将破碎、筛分完的镁砂颗粒，细磨为粒度≤0.088mm的镁砂细粉；
3)取1～5wt％的AlMg合金粉为抗氧化剂，再与20～27wt％的镁砂细粉一起混合均匀，成混合粉；
4)按配比要求将各种不同粒度的镁砂颗粒分别计量后，将占58～66wt％的镁砂颗粒、上述混合粉、0.5～3wt％的膨胀石墨、3～6wt％的天然鳞片石墨，以此先后顺序加入到高速混炼机中进行低速混炼1～2分钟，再加1.5～4.5wt％的酚醛树脂低速混炼1～2分钟，制成泥料；
5)再向高速混炼机中的泥料中加入0.1～5wt％的金属纤维，高速混炼8～10分钟，使金属纤维均匀分布在泥料中，金属纤维为不锈钢纤维；
6)混炼銡束后从高速混炼机中放出泥料，在复合式摩擦压砖机中打击成型形成砖坯，打击过程中每个砖坯打击最大受力在1.0t～3t/cm2之间，不低于5次，成型后砖坯密度为2.80～3.25g/cm3；
7)成型的砖坯经过50～300℃的温度干燥后即可制成低碳镁碳砖。
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