CN110282957A - 一种钒氮合金烧结炉用镁质隔热砖的制造方法 - Google Patents
一种钒氮合金烧结炉用镁质隔热砖的制造方法 Download PDFInfo
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 44
- 239000011449 brick Substances 0.000 title claims abstract description 28
- 238000005245 sintering Methods 0.000 title claims abstract description 25
- 229910001199 N alloy Inorganic materials 0.000 title claims abstract description 24
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 28
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 28
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 28
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
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- 238000004321 preservation Methods 0.000 claims abstract description 4
- 206010020843 Hyperthermia Diseases 0.000 claims abstract description 3
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- 235000012245 magnesium oxide Nutrition 0.000 claims description 41
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- 239000000203 mixture Substances 0.000 claims description 6
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- 239000002131 composite material Substances 0.000 claims description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims description 5
- 238000009472 formulation Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 229910052682 stishovite Inorganic materials 0.000 claims description 5
- 229910052905 tridymite Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 239000012774 insulation material Substances 0.000 abstract description 4
- 150000008064 anhydrides Chemical class 0.000 abstract description 2
- 238000010998 test method Methods 0.000 description 18
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 2
- 229910001948 sodium oxide Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
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- 238000009413 insulation Methods 0.000 description 1
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
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Abstract
本发明专利涉及一种钒氮合金烧结炉用镁质隔热砖的制造方法,包括以下步骤:1、以电熔镁砂、菱镁矿原矿和二氧化硅微粉为原料进行预混,预混时间5‑15分钟;2、木屑、聚乙烯球和水为外加剂,继续混炼10‑25分钟;3、将混炼后的均匀泥料装入制定的木质模具中,捣打成型,脱模后室温(25℃)养护12‑24小时;4、养护后砖坯经110℃‑180℃干燥12‑24小时,利用高温隧道窑在1450℃‑1550℃保温4‑8小时,砖坯随窑冷却,可以得到钒氮合金烧结炉用镁质隔热砖。本发明具有更好的抵抗碱性氧化物的侵蚀性能,材质优势有利于提高钒氮合金烧结炉内衬保温材料的使用寿命。
Description
技术领域
本发明涉及一种钒氮合金烧结炉用镁质隔热砖的制造方法,属于保温隔热材料技术领域。
背景技术
钒氮合金作为生产微合金化钢过程中的重要添加剂,能够提高钢的强度、韧性、延展性及抗热疲劳性等综合机械性能,并使钢具有良好的可焊性。同时钒氮合金还具有节约钒的添加量、钒氮收得率稳定、钢的性能波动小、比钒铁合金价格低等优点。因此作为一种高强度低合金钢用最经济有效的添加剂,具有广泛的市场空间,经济效益显著。目前用于钒氮合金生产的工业窑炉主要包括连续型推板式隧道窑、中频感应竖炉及间歇式高温高真空烧结炉等。钒氮合金生产普遍采用碳热还原氮化反应,窑炉内气氛条件复杂,高温产生大量水蒸气、一氧化碳、二氧化碳及氧化钾、氧化钠等碱性挥发物。因此,要求窑炉内衬耐火材料不仅具有良好的抗碱性氧化物侵蚀性能,同时具有很好的保温隔热性能。目前钒氮合金烧结炉用保温内衬材料普遍为高铝质或莫来石质,高铝质或莫来石质保温隔热材料虽然具有较好耐高温性、隔热性和体积稳定性,但是对碱性挥发分的抗侵蚀能力较差,窑内气氛中氧化钾、氧化钠等易与保温材料中的二氧化硅、氧化铝反应形成低熔点物相,影响钒氮合金烧结炉用保温内衬材料的使用寿命。以方镁石为主晶相的镁质材料具有高温性能好、能够克服极端碱性高温环境的优点,是一种具有良好发展前景的保温隔热材料,研究开发具有良好抗碱性侵蚀性、隔热性能的镁质隔热砖对生产钒氮合金具有十分重要的现实意义。
发明内容
鉴于钒氮合金烧结炉用内衬耐火材料的使用环境,本发明目的是要提供一种能够耐高温碱性氧化物侵蚀的镁质碱性隔热砖的制备方法。该制备方法生产的镁质碱性隔热砖具有抗碱侵蚀能力强、保温隔热性能好、高温强度大等优点,与传统中性或酸性轻质隔热材料相比,可显著提高钒氮合金烧结炉用内衬保温材料的使用寿命。
为实现上述目的,本发明通过以下技术方案实现:
一种钒氮合金烧结炉用镁质隔热砖的制造方法,其特征在于,以电熔镁砂、菱镁矿原矿和二氧化硅微粉为原料,木屑、聚乙烯球和水为外加剂,通过预混、混炼、成型、干燥和烧成生产的钒氮合金烧结炉用镁质隔热砖,其具体操作步骤如下:
第一步:预混,将以质量百分比计加入量为55%-85%的电熔镁砂(MgO>97.5%)、以质量百分比计加入量为10%-40%的菱镁矿原矿和以质量百分比计加入量为1%-5%的二氧化硅微粉(SiO2>95%)进行预混,预混时间5-15分钟;
第二步:混炼,以质量百分比计,外加以预混物料总质量5%-20%的1-3mm木屑、预混物料总质量1%-5%粒度为2mm的聚乙烯球和预混物料总质量15-35%的水加入到步骤(1)的预混物料中,继续混炼10-25分钟;
第三步:成型,将混炼后泥料,装入制定的木质模具中,捣打成型,脱模后室温(25℃)养护12-24小时;
第四步:干燥、烧成,养护后砖坯经110℃-180℃干燥12-24小时,利用高温隧道窑在1450℃-1550℃保温4-8小时,砖坯随窑冷却。
所述电熔镁砂、菱镁矿原矿的粒径应<0.074mm,二氧化硅微粉粒径应<0.044mm。
所述菱镁矿原矿为特级矿(MgO>47%)、一级矿(MgO>46%)和二级矿(MgO>45%)的任一种。
所述优选干燥温度为120℃-150℃,干燥时间为15-20小时,烧成温度为1470-1520℃,保温时间为5-7小时。
与现有技术相比,本发明的有益效果是:1)钒氮合金烧结炉用镁质碱性隔热内衬保温砖具有更好的抵抗碱性氧化物的侵蚀性能,材质优势有利于提高钒氮合金烧结炉内衬保温材料的使用寿命;2)镁质碱性隔热砖主晶相方镁石具有更高的熔点(2805℃),镁质碱性隔热砖具有更大的高温强度和荷重软化开始温度;3)坯体采用硅凝胶结合,干燥后坯体强度大,高温烧成过程中具有良好烧结性能,烧后镁质碱性隔热砖结构稳定。
附图说明
图1为本发明的工艺流程示意图。
具体实施方式
下面结合实施例对本发明的制备方法做进一步说明:
实施例1
本发明一种钒氮合金烧结炉用镁质隔热砖的制造方法,就是以电熔镁砂、菱镁矿原矿和二氧化硅微粉为原料,木屑、聚乙烯球和水为外加剂,通过预混、混炼、成型、干燥和烧成生产的钒氮合金烧结炉用镁质隔热砖,其具体操作步骤如下:
第一步:预混,将以质量百分比计加入量为77%的电熔镁砂(MgO>97.5%)、以质量百分比计加入量为20%的特级菱镁矿原矿(MgO>47%)和以质量百分比计加入量为3%的二氧化硅微粉(SiO2>95%)进行预混,预混时间10分钟;
第二步:混炼,在预混物料中,以质量百分比计,外加以预混物料总质量5%的木屑(粒度为1-3mm)、预混物料总质量1%的聚乙烯球(粒度为2mm)和预混物料总质量25%的水,继续混炼15分钟;
第三步:成型,将混炼后泥料,装入制定的木质模具中,捣打成型,脱模后室温(25℃)养护12小时;
第四步:干燥、烧成,养护后砖坯经150℃干燥24小时后,置于1500℃隧道窑的窑车上,随窑烧成,高温区烧成5小时,待温度降至室温后检查性能指标。
根据GB/T2998-2001定形隔热耐火制品体积密度和真气孔率试验方法、GB/T5072-2008耐火材料常温耐压强度试验方法、GB/T7320-2008耐火材料热膨胀试验方法、GB/T5988-2007耐火材料加热永久线变化试验方法、GB/T5989-2008 耐火材料荷重软化温度试验方法示差升温法、YB/T376.2-1995耐火制品抗热震性试验方法(空气急冷法)和YB/T4130-2005 耐火材料导热系数试验方法(水流量平板法)的标准。检测烧后镁质隔热砖性能指标如下:体积密度1.49g/cm3、显气孔率52%;常温耐压强度15.5MPa;1000℃线膨胀系数11.2×10-6℃-1;1500℃×12小时重烧线变化率-0.2%;0.1MPa荷重软化开始温度大于1600℃;抗热震性大于10次;导热系数(350±25℃)0.36W/(m﹒k)。
实施例2
本发明一种钒氮合金烧结炉用镁质隔热砖的制造方法,就是以电熔镁砂、菱镁矿原矿和二氧化硅微粉为原料,木屑、聚乙烯球和水为外加剂,通过预混、混炼、成型、干燥和烧成生产的钒氮合金烧结炉用镁质隔热砖,其具体操作步骤如下:
第一步:预混,将以质量百分比计加入量为65%的电熔镁砂(MgO>97.5%)、以质量百分比计加入量为32.5%的一级菱镁矿原矿(MgO>46%)和以质量百分比计加入量为2.5%的二氧化硅微粉(SiO2>95%)进行预混,预混时间10分钟;
第二步:混炼,在预混物料中,以质量百分比计,外加以预混物料总质量10%的木屑(粒度为1-3mm)、预混物料总质量2%的聚乙烯球(粒度为2mm)和预混物料总质量25%的水,继续混炼20分钟;
第三步:成型,将混炼后泥料,装入制定的木质模具中,捣打成型,脱模后室温(25℃)养护12小时;
第四步:干燥、烧成,养护后砖坯经150℃干燥24小时后,置于1500℃隧道窑的窑车上,随窑烧成,高温区烧成5小时,待温度降至室温后检查性能指标。
根据GB/T2998-2001定形隔热耐火制品体积密度和真气孔率试验方法、GB/T5072-2008耐火材料常温耐压强度试验方法、GB/T7320-2008耐火材料热膨胀试验方法、GB/T5988-2007耐火材料加热永久线变化试验方法、GB/T5989-2008 耐火材料荷重软化温度试验方法示差升温法、YB/T376.2-1995耐火制品抗热震性试验方法(空气急冷法)和YB/T4130-2005 耐火材料导热系数试验方法(水流量平板法)的标准。检测烧后镁质隔热砖性能指标如下:体积密度1.19g/cm3、显气孔率64%;常温耐压强度12.1MPa;1000℃线膨胀系数10.1×10-6℃-1;1500℃×12小时重烧线变化率-0.3%;0.1MPa荷重软化开始温度大于1600℃;抗热震性大于10次;导热系数(350±25℃)0.24W/(m﹒k)。
实施例3
本发明一种钒氮合金烧结炉用镁质隔热砖的制造方法,就是以电熔镁砂、菱镁矿原矿和二氧化硅微粉为原料,木屑、聚乙烯球和水为外加剂,通过预混、混炼、成型、干燥和烧成生产的钒氮合金烧结炉用镁质隔热砖,其具体操作步骤如下:
第一步:预混,将以质量百分比计加入量为60%的电熔镁砂(MgO>97.5%)、以质量百分比计加入量为38%的二级菱镁矿原矿(MgO>45%)和以质量百分比计加入量为2%的二氧化硅微粉(SiO2>95%)进行预混,预混时间10分钟;
第二步:混炼,在预混物料中,以质量百分比计,外加以预混物料总质量15%的木屑(粒度为1-3mm)、预混物料总质量4%的聚乙烯球(粒度为2mm)和预混物料总质量28%的水,继续混炼25分钟;
第三步:成型,将混炼后泥料,装入制定的木质模具中,捣打成型,脱模后室温(25℃)养护12小时;
第四步:干燥、烧成,养护后砖坯经150℃干燥24小时后,置于1500℃隧道窑的窑车上,随窑烧成,高温区烧成5小时,待温度降至室温后检查性能指标。
根据GB/T2998-2001定形隔热耐火制品体积密度和真气孔率试验方法、GB/T5072-2008耐火材料常温耐压强度试验方法、GB/T7320-2008耐火材料热膨胀试验方法、GB/T5988-2007耐火材料加热永久线变化试验方法、GB/T5989-2008 耐火材料荷重软化温度试验方法示差升温法、YB/T376.2-1995耐火制品抗热震性试验方法(空气急冷法)和YB/T4130-2005 耐火材料导热系数试验方法(水流量平板法)的标准。检测烧后镁质隔热砖性能指标如下:体积密度0.98g/cm3、显气孔率69%;常温耐压强度9.6MPa;1000℃线膨胀系数9.6×10-6℃-1;1500℃×12小时重烧线变化率-0.65%;0.1MPa荷重软化开始温度大于1600℃;抗热震性大于10次;导热系数(350±25℃)0.21W/(m﹒k)。
Claims (4)
1.一种钒氮合金烧结炉用镁质隔热砖的制造方法,其特征在于,以电熔镁砂、菱镁矿原矿和二氧化硅微粉为原料,木屑、聚乙烯球和水为外加剂,通过预混、混炼、成型、干燥和烧成生产的钒氮合金烧结炉用镁质隔热砖,其具体操作步骤如下:
第一步:预混,将以质量百分比计加入量为55%-85%的电熔镁砂(MgO>97.5%)、以质量百分比计加入量为10%-40%的菱镁矿原矿和以质量百分比计加入量为1%-5%的二氧化硅微粉(SiO2>95%)进行预混,预混时间5-15分钟;
第二步:混炼,以质量百分比计,外加以预混物料总质量5%-20%的1-3mm木屑、预混物料总质量1%-5%的粒度为2mm的聚乙烯球和预混物料总质量15-35%的水加入到步骤(1)的预混物料中,继续混炼10-25分钟;
第三步:成型,将混炼后泥料,装入制定的木质模具中,捣打成型,脱模后室温(25℃)养护12-24小时;
第四步:干燥、烧成,养护后砖坯经110℃-180℃干燥12-24小时,利用高温隧道窑在1450℃-1550℃保温4-8小时,砖坯随窑冷却。
2.在根据权利要求1所述的一种钒氮合金烧结炉用镁质隔热砖的制造方法,其特征在于,所述电熔镁砂、菱镁矿原矿的粒径应<0.074mm,二氧化硅微粉粒径应<0.044mm。
3.根据权利要求1所述的一种钒氮合金烧结炉用镁质隔热砖的制造方法,其特征在于,所述菱镁矿原矿为特级矿(MgO>47%)、一级矿(MgO>46%)和二级矿(MgO>45%)的任一种。
4.根据权利要求1所述的一种钒氮合金烧结炉用镁质隔热砖的制造方法,其特征在于,所述优选干燥温度为120℃-150℃,干燥时间为15-20小时,烧成温度为1470-1520℃,保温时间为5-7小时。
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