CN108017377A - 一种镁碳化硅锆砖及其生产方法 - Google Patents
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Abstract
本发明提供了一种镁碳化硅锆砖及其生产方法,是由下列重量份数的原料制备而成:0<粒度≤0.088mm的97高纯镁砂20‑25份,0<粒度≤1mm的97高纯镁砂15‑25份,1mm<粒度≤3mm的97高纯镁砂25‑35份,3mm<粒度≤5mm的97高纯镁砂5‑15份;96碳化硅细粉0~5份,锆英石细粉0‑3份,结合剂2‑4份。本发明引入适量的碳化硅和锆英石,大大提高了镁质砖的抗酸性渣侵蚀能力。应用于玻璃窑蓄热室上层格子体,代替目前的98镁砖、镁锆砖、铬刚玉砖,实现无铬化。本发明物料中不含铬,非氧化物碳化硅、锆英石的引入,降低了镁质材料的热膨胀系数,大大提高了抗热震性能,抗酸性渣的侵蚀能力,其耐磨性好,高温强度大,热导率高,热膨胀系数小是玻璃窑蓄热室比较理想的耐材。
Description
技术领域
本发明涉及一种镁碳化硅锆砖及其生产方法,应用于玻璃窑蓄热室上层格子体。
背景技术
随着玻璃窑用石油焦燃料的推广,燃烧产物中SiO3、V2O5加剧了玻璃窑蓄热室耐材的损毁速度,对耐材提出了更高要求。
在氧化气氛中,V2O5与CaO反应产生低熔点的钒酸钙,在稍有降低的氧化气氛中,产生挥发性的钒酸钙。氧化镁中的结合相失去CaO,CaO/SiO2比变化到高氧化硅水平,低熔物硅酸钙镁、镁蔷微辉石和钙镁橄榄石出现。
在MgO-ZrO2复相材料中,当用锆英石(ZrSiO4)作为ZrO2源时,从相平衡看,已由MgO-ZrO2二元系变为MgO-ZrO2-SiO2三元系,该三元系中没有三元化合物,为MgO-M2S-ZrO2共存系统,结合基质为镁橄榄石和ZrO2。
MgO-ZrO2·SiO2质耐火材料在烧成过程中其基质中的ZrO2·SiO2首先分解为ZrO2和SiO2,后者又与MgO结合为2MgO·SiO2+ZrO2·SiO2→2MgO·SiO2+ZrO2。当以ZrO2·SiO2为ZrO2源配入MgO质耐火材料时,在ZrO2增加的同时,也增加了SiO2的含量,因而二者对材料的不同侧面有着作用,应根据原料的不同,使用环境的特点选择ZrO2最佳配入量。
SiC分子量为40,密度3.22kg/m3,莫氏硬度9.0~9.5。有立方晶系β-SiC和六方晶系的α-SiC。β-SiC只有一种晶型,α-SiC有多种晶型。热膨胀系数4.7×10-6,热导率高(20℃时为58.6W/m℃),并随温度升高而降低。1000℃开始分解,1700℃时分解作用进行迅速。氧化速度随时间而减慢。
非氧化物碳化硅与氧化镁不互溶,在高温下稳定。碳化硅的引入,可以降低镁质材料膨胀系数,而且可以提高镁质材料对石油焦燃烧产物中SiO3、V2O5的抗侵蚀侵蚀能力。
发明内容
本发明的目的在于提供一种镁碳化硅锆砖及其生产方法,用于玻璃窑蓄热室上层格子体,其耐磨性和耐侵蚀性好,高温强度大,热导率高,热膨胀系数小,热震稳定性好。
为了达到上述目的,本发明采用以下技术方案实现:
一种镁碳化硅锆砖,是由下列重量份数的原料制备而成:0<粒度≤0.088mm的97高纯镁砂20-25份,0<粒度≤1mm的97高纯镁砂15-25份,1mm<粒度≤3mm的97高纯镁砂25-35份,3mm<粒度≤5mm的97高纯镁砂5-15份;96碳化硅细粉0~5份,不含0份,锆英石细粉0-3份,不含0份,结合剂2-4份。
所述结合剂为纸浆废液。
所述96碳化硅细粉的粒径为325目。
所述锆英石细粉的粒径为325目。
一种镁碳化硅锆砖的生产方法,包括如下步骤:
1)原料破碎、筛分、细磨:97高纯镁砂经破碎,粉碎成0<粒度≤0.088mm、0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm的颗粒;
2)配料:将原料按照上述重量份数称重备用;先将96碳化硅细粉、锆英石细粉与10-20份0<粒度≤1mm的97高纯镁砂颗粒进行预混;
3)混练:先加入1mm<粒度≤3mm、3mm<粒度≤5mm和剩余的0<粒度≤1mm的97高纯镁砂颗粒,干混3~5min,然后加入结合剂,再混3~5min,加入步骤2)中得到预混料和0<粒度≤0.088mm的97高纯镁砂颗粒,混8~12min,然后出料;
4)机压成型:采用630吨压砖机成型,砖坯体密≥3.05g/cm3。
5)干燥:干燥温度为100~120℃,干燥10h以上;
6)烧成:弱氧化气氛烧成,烧成温度1400~1600℃,烧成时间2~4h。
与现有技术相比,本发明的有益效果是:
1)本发明引入适量的碳化硅和锆英石,其中碳化硅与镁砂不互溶,不生成低熔点矿物,碳化硅可能纯在部分氧化,生成SiO2,SiO2与MgO生成镁橄榄石;锆英石在高温下分解,生成ZrO2、SiO2,SiO2与MgO生成镁橄榄石;碳化硅,氧化锆,橄榄石矿物相同时存在,大大提高了镁质砖的抗酸性渣侵蚀能力。应用于玻璃窑蓄热室上层格子体,代替目前的98镁砖、镁锆砖、铬刚玉砖,实现无铬化。
2)本发明物料中不含铬,非氧化物碳化硅、锆英石的引入,降低了镁质材料的热膨胀系数,大大提高了抗热震性能,抗酸性渣的侵蚀能力,其耐磨性好,高温强度大,热导率高,热膨胀系数小是玻璃窑蓄热室比较理想的耐材。
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:
一种镁碳化硅锆砖,是由下列重量份数的原料制备而成:0<粒度≤0.088mm的97高纯镁砂20-25份,0<粒度≤1mm的97高纯镁砂15-25份,1mm<粒度≤3mm的97高纯镁砂25-35份,3mm<粒度≤5mm的97高纯镁砂5-15份;96碳化硅细粉0-5份,不含0份,锆英石细粉0-3份,不含0份,结合剂2-4份。
所述结合剂为纸浆废液。
所述96碳化硅细粉的粒径为325目。
所述锆英石细粉的粒径为325目。
一种镁碳化硅锆砖的生产方法,包括如下步骤:
1)原料破碎、筛分、细磨:97高纯镁砂经破碎,粉碎成0<粒度≤0.088mm、0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm的颗粒;
2)配料:将原料按照上述重量份数称重备用;先将96碳化硅细粉、锆英石细粉与10-20份0<粒度≤1mm的97高纯镁砂颗粒进行预混;
3)混练:先加入1mm<粒度≤3mm、3mm<粒度≤5mm和剩余的0<粒度≤1mm的97高纯镁砂颗粒,干混3~5min,然后加入结合剂,再混3~5min,加入步骤2)中得到预混料和0<粒度≤0.088mm的97高纯镁砂颗粒,混8~12min,然后出料;
4)机压成型:采用630吨压砖机成型,砖坯体密≥3.05g/cm3。
5)干燥:干燥温度为100~120℃,干燥10h以上;
6)烧成:弱氧化气氛烧成,烧成温度1400~1600℃,烧成时间2~4h。
本发明主要原料指标见表1:
表1 单位:wt%
烧成产品的理化指标见表2:
表2:
项目 | 典型值 |
MgO,wt% | 92.2 |
SiO2,wt% | 1.60 |
CaO,wt% | 1.20 |
Al2O3,wt% | 0.20 |
SiC,wt% | 4.5 |
ZrO2,wt% | 2.0 |
显气孔率,% | 17.0 |
体密密度,g/cm3 | 2.95 |
常温耐压强度,MPa | 60.0 |
热震稳定性,(1100℃,水冷)次 | 5 |
实施例配方见表3:
表3
原料 | 粒度,mm | 实施例1 | 实施例2 | 实施例3 | 实施例4 | 实施例5 |
97高纯镁砂 | 5-3 | 15 | 5 | 10 | 8 | 12 |
97高纯镁砂 | 3-1 | 35 | 25 | 30 | 28 | 31 |
97高纯镁砂 | 1-0 | 25 | 15 | 16 | 20 | 23 |
97高纯镁砂 | 0.088-0 | 25 | 20 | 21 | 22 | 23 |
96碳化硅 | 325目 | 5 | 1 | 2 | 3 | 4 |
锆英石 | 325目 | 3 | 1 | 2 | 1 | 3 |
纸浆废液 | 2 | 4 | 3 | 2 | 3 |
实施例产品的生产方法如下:
1)原料破碎、筛分、细磨:97高纯镁砂经破碎,粉碎成0<粒度≤0.088mm、0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm的颗粒;
2)配料:将原料按照上述重量份数称重备用;先将96碳化硅细粉、锆英石细粉与10-20份0<粒度≤1mm的97高纯镁砂颗粒进行预混;(实施例1-5在该步骤中的0<粒度≤1mm的97高纯镁砂颗粒的加入量分别为:20份,10份,10份,12份,16份)
3)混练:先加入1mm<粒度≤3mm、3mm<粒度≤5mm和剩余的0<粒度≤1mm的97高纯镁砂颗粒,干混3~5min,然后加入结合剂,再混3~5min,加入步骤2)中得到预混料和0<粒度≤0.088mm的97高纯镁砂颗粒,混8~12min,然后出料;
4)机压成型:采用630吨压砖机成型,砖坯体密≥3.05g/cm3。
5)干燥:干燥温度为100~120℃,干燥10h以上;
6)烧成:弱氧化气氛烧成,烧成温度1400~1600℃,烧成时间2~4h。
7)验收及包装:
1验收:
1.1料的取样、验收按YB 367-75《耐火制品取样、验收、保管和运输规则》进行。
1.2随机取样做化学成分分析。
2包装、运输、贮存及质量证明书:
2.1料的包装、运输和贮存按YB 367-75《耐火制品取样、验收、保管和运输规则》进行。
2.2料出厂时必须附有技术监督部门签发的质量证明书、标明供方名称或厂标、需方名称、发货日期、合同号、标准编号、产品名称、牌号、批号及理化指标,等结果报告。
Claims (5)
1.一种镁碳化硅锆砖,其特征在于,是由下列重量份数的原料制备而成:0<粒度≤0.088mm的97高纯镁砂20-25份,0<粒度≤1mm的97高纯镁砂15-25份,1mm<粒度≤3mm的97高纯镁砂25-35份,3mm<粒度≤5mm的97高纯镁砂5-15份;96碳化硅细粉0~5份,不含0份,锆英石细粉0-3份,不含0份,结合剂2-4份。
2.根据权利要求1所述的一种镁碳化硅锆砖,其特征在于,所述结合剂为纸浆废液。
3.根据权利要求1所述的一种镁碳化硅锆砖,其特征在于,所述96碳化硅细粉的粒径为325目。
4.根据权利要求1所述的一种镁碳化硅锆砖,其特征在于,所述锆英石细粉的粒径为325目。
5.一种如权利要求1所述的镁碳化硅锆砖的生产方法,其特征在于,包括如下步骤:
1)原料破碎、筛分、细磨:97高纯镁砂经破碎,粉碎成0<粒度≤0.088mm、0<粒度≤1mm、1mm<粒度≤3mm、3mm<粒度≤5mm的颗粒;
2)配料:将原料按照上述重量份数称重备用;先将96碳化硅细粉、锆英石细粉与10-20份0<粒度≤1mm的97高纯镁砂颗粒进行预混;
3)混练:先加入1mm<粒度≤3mm、3mm<粒度≤5mm和剩余的0<粒度≤1mm的97高纯镁砂颗粒,干混3~5min,然后加入结合剂,再混3~5min,加入步骤2)中得到预混料和0<粒度≤0.088mm的97高纯镁砂颗粒,混8~12min,然后出料;
4)机压成型:采用630吨压砖机成型,砖坯体密≥3.05g/cm3。
5)干燥:干燥温度为100~120℃,干燥10h以上;
6)烧成:弱氧化气氛烧成,烧成温度1400~1600℃,烧成时间2~4h。
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