CN114455940A - 一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料及其制备方法 - Google Patents
一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料及其制备方法 Download PDFInfo
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- 239000011029 spinel Substances 0.000 title claims abstract description 46
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 46
- -1 Magnesium-manganese-iron-aluminum Chemical compound 0.000 title claims abstract description 41
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 239000004568 cement Substances 0.000 title claims abstract description 25
- 239000011819 refractory material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 13
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 13
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 13
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims abstract description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 31
- 239000000395 magnesium oxide Substances 0.000 claims description 17
- 239000007767 bonding agent Substances 0.000 claims description 4
- 229920001353 Dextrin Polymers 0.000 claims description 3
- 239000004375 Dextrin Substances 0.000 claims description 3
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 3
- 235000019425 dextrin Nutrition 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims 1
- 239000011449 brick Substances 0.000 abstract description 22
- 239000011248 coating agent Substances 0.000 abstract description 11
- 238000000576 coating method Methods 0.000 abstract description 11
- 230000035939 shock Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910000616 Ferromanganese Inorganic materials 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 238000005526 cement kiln firing Methods 0.000 abstract 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229910001691 hercynite Inorganic materials 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
本发明属于水泥窑用耐火制品技术领域，涉及一种耐火砖，特别涉及一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料及其制备方法。按重量百分比计，该耐火材料的原料组成为：镁砂颗粒60～65%，镁砂细粉30～35%，锰铁铝复合尖晶石粉5～25%，结合剂3～5%。制备方法如下：按重量百分比称量以下各组分原料，将各种原料加入混料机中进行混练20～30分钟，根据制品的形状及单重选择在不同吨位的压力机上成型，成型的坯体在110℃下干燥24 h，进行1550℃～1650℃×8 h烧成，自然冷却。本发明生产的水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料有着优异的挂窑皮性和抗热震性，这种耐火材料生产和使用过程对气氛要求不严格，容易控制。
Description
技术领域
本发明属于水泥窑用耐火制品技术领域，涉及一种耐火砖，特别涉及一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料及其制备方法。
背景技术
传统的水泥窑烧成带用碱性材料镁铬砖，其具有抗剥落性、抗冲刷性和抗碱性水泥熟料的化学侵蚀性能。镁铬砖中Cr3+在水泥窑环境中转换成Cr6+，Cr6+对人体有害，残余衬砖弃置后水溶性Cr6+进入水资源，污染环境。因此，在水泥窑中取代镁铬砖是必然的。水泥窑烧成带用无铬碱性耐火材料经历了镁铝尖晶石、镁铁尖晶石到镁铁铝尖晶石的发展过程，铁铝尖晶石可与水泥物料反应生成C4AF，形成稳定的窑皮，提高镁铁铝尖晶石砖的使用寿命。但铁铝尖晶石中的铁有Fe2+、Fe3+两种价态，在镁铁铝尖晶石砖的生产和使用中，由于气氛的变化造成其价态转变，造成较大的体积变化，从而产生内应力，损坏耐火材料内部结构，降低高温强度，影响使用寿命。由于Mn离子价态较Fe离子更稳定，其在生成和使用中对气氛不敏感，且MnO的熔点高于FeO，锰铝尖晶石挂窑皮的稳定性更好，窑皮不易脱落。锰铝尖晶石具有低的热膨胀系数，抗热震性较好，且锰铝尖晶石的合成条件较易控制。将锰铁铝复合尖晶石加入到镁砂中，制备镁锰铁铝复合尖晶石耐火材料用于水泥窑烧成带，其具有较好的挂窑皮性和抗热震性，可延长烧成带的使用寿命。
发明内容
1、本发明所要解决的技术问题是：针对目前水泥窑烧成带用镁铁铝尖晶石耐火材料中铁的价态变化造成体积不稳定，产生内应力，损坏耐火砖内部结构，降低高温强度，影响耐火材料使用寿命。本技术提供一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料制备方法。通过加入锰铁铝复合尖晶石，铁离子与水泥物料发生反应生成C4AF，这是一种稳定的窑皮，且锰铝尖晶石挂窑皮稳定性更好，窑皮不易脱落。这种耐火材料生产和使用过程对气氛要求不严格，容易控制。Mn2+的价态更稳定，在使用中不会因价态的变化产生内应力，损坏耐火砖内部结构。由于锰铁铝复合尖晶石的热膨胀系数和周围氧化镁不一致，造成高温下不匹配效应，在砖体内形成微裂纹，增加了砖体的弹性和柔性，提高抗机械应力及碱硫侵蚀的能力和热震稳定性，延长使用寿命。
本发明为解决技术问题所采取的技术方案是：
一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料，按重量百分比计，该耐火材料的原料组成为：镁砂颗粒60～65%，镁砂细粉30～35%，铁锰铝复合尖晶石5～25%，结合剂3～5%。
上面所述的水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料的制备方法，其具体步骤如下：
A、按重量百分比称量以下各组分原料：镁砂颗粒60～65%，镁砂细粉30～35%，锰铁铝复合尖晶石5～25%，结合剂3～5%；
B、将各种原料加入混料机中进行混练20～30分钟，根据制品的形状及单重选择在不同吨位的压力机上成型；
C、成型的坯体在110 ℃下干燥24 h，进行1550 ℃～1650 ℃×8 h烧成，自然冷却。
所述的镁砂颗粒的组成为：粒径为1～3 mm的镁砂颗粒占30～35%，粒径小于1 mm的镁砂颗粒占20～25%，所述的镁砂细粉粒度小于0.074 mm，所述的锰铁铝复合尖晶石为粒径小于2 mm的颗粒或小于0.074 mm的细粉或两者复合使用。
所述的锰铁铝复合尖晶石中，5%≤FeO≤20%，5%≤MnO≤40%，40%≤Al2O3≤60%。
所述的结合剂为糊精、纸浆废液、木质素磺酸钙、甲基纤维素中的一种或任意几种的组合。
本发明的积极有益效果如下：
1、本发明中所制备的镁锰铁铝复合尖晶石耐火材料，其具有较好的气氛稳定性，由于Mn2+的价态较稳定，在使用中不会因价态的变化产生内应力，损坏耐火砖内部结构。在生产和使用中对气氛不敏感。
2、本发明中锰铁铝复合尖晶石，其中锰铝尖晶石的合成条件易控制，铁离子与水泥物料发生反应生成C4AF，这是一种稳定的窑皮，且MnO的熔点高于FeO，锰铝尖晶石挂窑皮的稳定性更好，窑皮不易脱落。
3、本发明中所制备的镁锰铁铝复合尖晶石耐火材料，由于锰铁铝复合尖晶石的热膨胀系数和周围氧化镁不一致，造成高温下不匹配效应，在砖体内形成微裂纹，增加了砖体的弹性和柔性，提高抗机械应力及碱硫侵蚀的能力和热震稳定性。
4、本发明中因选用粒度较细的锰铁铝复合尖晶石，其活性较高，可以观察到在高温烧结后，试样中Mn(Fe)Al2O4和Mg2+发生互扩散，生成Mn(Fe、Mg)Al2O4复合尖晶，提高制品高温强度。
具体实施方式
下面对本发明做进一步的解释、说明：
实施例：一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料，按重量百分比计，该耐火材料的原料组成为：镁砂颗粒60～65%，镁砂细粉30～35%，锰铁铝复合尖晶石5～25%，结合剂3～5%。
如上所述的水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料，其具体的制备方法如下：
A、按重量百分比称量以下各组分原料：镁砂颗粒60～65%，镁砂细粉30～35%，锰铁铝复合尖晶石5～25%，结合剂3～5%；
B、将各种原料加入混料机中进行混练20～30分钟，根据制品的形状及单重选择在不同吨位的压力机上成型；
C、成型的坯体在110 ℃下干燥24 h，进行1550 ℃～1650 ℃×8 h烧成，自然冷却。
所述的镁砂颗粒的组成为：粒径为1～3 mm的镁砂颗粒占30～35%，粒径为小于1mm的镁砂颗粒占20～25%，所述的镁砂细粉粒度小于0.074 mm，所述的锰铁铝复合尖晶石为粒径小于2 mm的颗粒或小于0.074 mm的细粉或两者复合使用。
所述的锰铁铝复合尖晶石中，5%≤FeO≤20%，5%≤MnO≤40%，40%≤Al2O3≤60%。
所述的结合剂为糊精、纸浆废液、木质素磺酸钙、甲基纤维素中的一种或任意几种的组合。
本发明中所制备的水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料，这种复合尖晶石耐火材料有着优异的挂窑皮性和抗热震性，这种耐火材料生产和使用过程对气氛要求不严格，容易控制。Mn2+的价态更稳定，在使用中不会因价态的变化产生内应力，损坏耐火砖内部结构。由于锰铁铝复合尖晶石的热膨胀系数和周围氧化镁不一致，造成高温下不匹配效应，在砖体内形成微裂纹，增加了砖体的弹性和柔性，增加高温强度，延长使用寿命，本发明中所制备的镁锰铁铝复合尖晶石耐火材料因其优良的物理化学性能适用于烧成带。
Claims (5)
1.一种水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料，其特征在于，按重量百分比计，该耐火材料的原料组成为：镁砂颗粒60～65%，镁砂细粉30～35%，锰铁铝复合尖晶石5～25%，结合剂3～5%。
2.根据权利要求1所述的水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料的制备方法，其特征在于，所述的镁砂颗粒的组成为：粒径为1～3 mm的镁砂颗粒占30～35%，粒径小于1mm的镁砂颗粒占20～25%，所述的镁砂细粉粒度小于0.074 mm，所述的锰铁铝复合尖晶石为粒径小于2 mm的颗粒或小于0.074 mm的细粉或两者复合使用。
3.根据权利要求1所述的锰铁铝复合尖晶石中，5%≤FeO≤20%，5%≤MnO≤40%，40%≤Al2O3≤60%。
4.根据权利要求1所述的结合剂为糊精、纸浆废液、木质素磺酸钙、甲基纤维素中的一种或任意几种的组合。
5.权利要求1所述的水泥窑烧成带用镁锰铁铝复合尖晶石耐火材料的制备方法，其具体步骤如下：
A、按重量百分比称量以下各组分原料：镁砂颗粒60～65%，镁砂细粉30～35%，铁锰铝复合尖晶石5～25%，结合剂3～5%；
B、将各种原料加入混料机中进行混练20～30分钟，根据制品的形状及单重选择在不同吨位的压力机上成型；
C、成型的坯体在110 ℃下干燥24 h，进行1550 ℃～1650 ℃×8 h烧成，自然冷却。
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