CN109650913A - 钢包或铁包的包沿用钛铝酸钙浇注料及制备方法 - Google Patents
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Abstract
本发明公开了一种钢包或铁包的包沿用钛铝酸钙浇注料,按重量百分比包括60~80%的钛铝酸钙、10~25%的高铝矾土熟料、2~6%的铝酸钙水泥、2~8%的氧化铝微粉及3~6%硅微粉,制备时外加聚丙烯纤维和减水剂,聚丙烯纤维重量占所有原料重量之和的0.01~0.04%,减水剂重量占所有原料重量之和的0.1~0.5%。加入氧化铝微粉和硅微粉,在使用温度下能维持钢/铁包包沿体积稳定性,有效降低了产品的损毁程度和安全隐患;采用铝酸钙水泥和硅微粉作复合结合剂,具有良好的的施工性能和中高温强度,使用寿命长,减少了修补次数,保障了钢包的生产顺行;大量采用了钛铝酸钙,钛铝酸钙浇注料的中高温下体积稳定性好、强度高。
Description
技术领域
本发明涉及一种钢包或铁包的包沿用钛铝酸钙浇注料及制备方法。
背景技术
近年来炉外精炼和连铸技术的发展,钢包不仅是盛装钢水的容器,已变成了钢水精炼设备,尤其是炉外精炼与连铸配套使用,钢水在钢包内停留时间大大延长,迫使出钢温度提高,导致钢包用耐火材料的使用环境越来越苛刻,要求越来越高。
目前,国内钢(铁)包包沿普遍使采包沿浇注料整体浇注而成,或者采用包沿砖砌筑外加背缝用包沿浇注料填充的模式。包沿浇注料一般为铝镁浇注料或高铝浇注料。采用铝镁浇注料时,在使用温度下会由于生成一定量的铝镁尖晶石而产生体积膨胀,强度变低,在清渣/勾渣时会导致浇注料损毁;除此之外,在夏季施工时,铝镁浇注料会凝固较快大大缩短了施工时间,为了保证施工时间工人就会加大加水量,这就会导致浇注料后期强度更低。采用高铝浇注料时,其主要原料高铝矾土熟料所含杂质在高温下会产生液相导致收缩,在包沿反复冷热变化过程中就会产生裂纹,整体强度降低导致损毁较快。
发明内容
本发明的目的就是针对上述技术的不足,提供一种体积稳定性好、中高温强度高且使用寿命较长的钢包或铁包的包沿用钛铝酸钙浇注料及制备方法。
为实现上述目的,本发明所设计的钢包或铁包的包沿用钛铝酸钙浇注料,所述钛铝酸钙浇注料按重量百分比包括如下原料:
且制备时外加聚丙烯纤维和减水剂,其中,聚丙烯纤维重量占所有原料重量之和的0.01~0.04%,减水剂重量占所有原料重量之和的0.1~0.5%。
进一步地,所述钛铝酸钙浇注料按重量百分比包括如下原料:
且制备时外加聚丙烯纤维和减水剂,其中,聚丙烯纤维重量占所有原料重量之和的0.01%,减水剂重量占所有原料重量之和的0.2%。
进一步地,所述钛铝酸钙是由生产钛铁合金产生的渣加工而成的,其中,Al2O3质量百分比为72~78%、TiO2质量百分比为9~12%;所述钛铝酸钙粒度为0.088mm≤粒度≤8mm,粒度≥8mm时会影响施工性能变差,粒度≤0.088mm时会影响浇注料的高温性能变差;其中,0.088mm≤粒度≤1mm的钛铝酸钙占钛铝酸钙总质量的15~25%、1mm≤粒度≤3mm的钛铝酸钙占钛铝酸钙总质量的15~30%、3mm≤粒度≤5mm的钛铝酸钙占钛铝酸钙总质量的20~40%,各个粒度钛铝酸钙的重量百分比超出上述范围会直接影响浇注料的粒度级配,进而影响产品的施工性能和使用性能。
进一步地,所述氧化铝微粉中的Al2O3质量百分比≥98.5%,且所述氧化铝微粉的粒度≤0.088mm。粒度越小,氧化铝微粉的活性越高,有助于增加浇注料中高温的烧结性能和强度;同时,氧化铝微粉和硅微粉在高温下能反应生成莫来石,产生一定程度体积膨胀,弥补该浇注料由于烧结导致的体积收缩,保证浇注料有良好的体积稳定性。
进一步地,所述铝酸钙水泥中的Al2O3质量百分比≥70%,且所述铝酸钙水泥的粒度≤0.088mm。钛铝酸钙的粒度和Al2O3的含量能保证该浇注料的常温强度,有效提高其施工性能和使用寿命。
进一步地,所述硅微粉中的SiO2质量百分比≥92%,且所述硅微粉粒度≤0.088mm。硅微粉粒度越小,流动性和活性越好,有助于增加浇注料施工时的流动性能和高温使用时的烧结性能。
另外,外加的聚丙烯纤维是为了减少浇注料施工后的养生和干燥时间,提高烘烤或使用时的体积稳定性、防止爆裂;外加的减水剂为三聚磷酸钠和六偏磷酸钠中的至少一种,加入减水剂是为了降低浇注料的加水量,缩短养生时间,提高浇注料常温强度。
一种如上述所述钢包或铁包的包沿用钛铝酸钙浇注料的制备方法,包括如下步骤:
1)按照所述原料及重量百分比将铝酸钙水泥、氧化铝微粉、硅微粉、聚丙烯纤维、减水剂混合均匀形成预混料,且聚丙烯纤维重量占所有原料重量之和的0.01~0.04%,减水剂重量占所有原料重量之和的0.1~0.5%;
2)将高铝矾土熟料加入预混料中混合均匀形成均混料,预混能够有效降低浇注料中的重要原料混合不均匀的现象,避免工艺缺陷造成对产品施工性能和使用性能的不良影响;
3)向步骤2)中的均混料加入水搅拌均匀并振动成型,然后在室温条件下养护;
4)最后在100~110℃条件下保温制得钢/铁包包沿用钛铝酸钙浇注料。
进一步地,所述步骤3)中,水的重量占所有原料重量之和的4.5~5.5%。
进一步地,所述步骤3)中,养护时间为12~24小时。
进一步地,所述步骤4)中,保温时间为12~24小时。
加水量高于5.5%会显著降低浇注料的强度,进而影响使用效果,加水量低于4.5%会导致浇注料偏干、骨料和粉料包覆性不好,出现疏松的状况;养护时间小于12小时会导致结合剂水化时间不够,影响浇注料的强度,养护时间大于24小时会影响现场的施工进度;当烘烤温度大于120℃时会导致浇注料急剧脱水产生裂纹,当烘烤温度小于100℃时,浇注料中的水分不能及时、有效地排出,在使用时容易造成爆裂等现象。
与现有技术相比,本发明的有益效果如下:
1)本发明的钛铝酸钙浇注料由于加入氧化铝微粉和硅微粉,在使用温度下能维持钢/铁包包沿体积稳定性,有效降低了产品的损毁程度和安全隐患;
2)本发明的钛铝酸钙浇注料由于采用铝酸钙水泥和硅微粉作复合结合剂,具有良好的的施工性能和中高温强度,使用寿命长,减少了修补次数,保障了钢包的生产顺行;
3)本发明大量采用了钛铝酸钙,钛铝酸钙浇注料的中高温下体积稳定性好、强度高;在对工业废渣进行了综合利用的同时,大大降低了传统高铝矾土熟料的使用量,有效降低了生产成本,具有显著的社会效益和经济效益。
具体实施方式
下面结合具体实施例和对比例对本发明作进一步的详细说明,便于更清楚地了解本发明,但它们不对本发明构成限定。
通过控制钛铝酸钙、高铝矾土熟料、铝酸钙水泥、氧化铝微粉及硅微粉的粒度和加入量,以及制备时外加聚丙烯纤维、减水剂的加入量,以及均混时间、加水量、养护时间和烘烤时间等工艺参数,制备出一种体积稳定性好、中高温强度高、使用寿命长且经济环保的钛铝酸钙浇注料。
表1为本发明各实施例和对比例的原料加入量列表;
表2为本发明各实施例和对比例的主要工艺参数;
表3为本发明各实施例和对比例性能检测情况列表。
表1(Wt,%)
表2
表3
如表1~3的实施例1~4所示,在本发明限定的原料加入量和生产工艺参数,浇注料中加入适量的钛铝酸钙、高铝矾土熟料、铝酸钙水泥、氧化铝微粉、硅微粉、聚丙烯纤维、减水剂,同时控制好均混时间、加水量、养护时间和烘烤时间这些工艺参数,就能制备出一种体积稳定性好,中高温强度高,使用寿命长且经济环保的钢(铁)包包沿用钛铝酸钙浇注料。
相对地,对于未控制原料加入量和生产工艺参数的对比例1~3中,浇注料不能同时具备良好的体积稳定性和常温、中高温强度,无法满足产品的施工和使用性能。
Claims (10)
1.一种钢包或铁包的包沿用钛铝酸钙浇注料,其特征在于:所述钛铝酸钙浇注料按重量百分比包括如下原料:
且制备时外加聚丙烯纤维和减水剂,其中,聚丙烯纤维重量占所有原料重量之和的0.01~0.04%,减水剂重量占所有原料重量之和的0.1~0.5%。
2.根据权利要求1所述钢包或铁包的包沿用钛铝酸钙浇注料,其特征在于:所述钛铝酸钙浇注料按重量百分比包括如下原料:
且制备时外加聚丙烯纤维和减水剂,其中,聚丙烯纤维重量占所有原料重量之和的0.01%,减水剂重量占所有原料重量之和的0.2%。
3.根据权利要求1所述钢包或铁包的包沿用钛铝酸钙浇注料,其特征在于:所述钛铝酸钙中Al2O3质量百分比为72~78%、TiO2质量百分比为9~12%;所述钛铝酸钙粒度为0.088mm≤粒度≤8mm,其中,0.088mm≤粒度≤1mm的钛铝酸钙占钛铝酸钙总质量的15~25%、1mm≤粒度≤3mm的钛铝酸钙占钛铝酸钙总质量的15~30%、3mm≤粒度≤5mm的钛铝酸钙占钛铝酸钙总质量的20~40%。
4.根据权利要求1所述钢包或铁包的包沿用钛铝酸钙浇注料,其特征在于:所述氧化铝微粉中的Al2O3质量百分比≥98.5%,且所述氧化铝微粉的粒度≤0.088mm。
5.根据权利要求1所述钢包或铁包的包沿用钛铝酸钙浇注料,其特征在于:所述铝酸钙水泥中的Al2O3质量百分比≥70%,且所述铝酸钙水泥的粒度≤0.088mm。
6.根据权利要求1所述钢包或铁包的包沿用钛铝酸钙浇注料,其特征在于:所述硅微粉中的SiO2质量百分比≥92%,且所述硅微粉粒度≤0.088mm。
7.一种如权利要求1所述钢包或铁包的包沿用钛铝酸钙浇注料的制备方法,其特征在于:所述制备方法包括如下步骤:
1)按照所述原料及重量百分比将铝酸钙水泥、氧化铝微粉、硅微粉、聚丙烯纤维、减水剂混合均匀形成预混料,且聚丙烯纤维重量占所有原料重量之和的0.01~0.04%,减水剂重量占所有原料重量之和的0.1~0.5%;
2)将高铝矾土熟料加入预混料中混合均匀形成均混料;
3)向步骤2)中的混料加入水搅拌均匀并振动成型,然后在室温条件下养护;
4)最后在100~110℃条件下保温制得钢/铁包包沿用钛铝酸钙浇注料。
8.根据权利要求7所述钢包或铁包的包沿用钛铝酸钙浇注料的制备方法,其特征在于:所述步骤3)中,水的重量占所有原料重量之和的4.5~5.5%。
9.根据权利要求7所述钢包或铁包的包沿用钛铝酸钙浇注料的制备方法,其特征在于:所述步骤3)中,养护时间为12~24小时。
10.根据权利要求7所述钢包或铁包的包沿用钛铝酸钙浇注料的制备方法,其特征在于:所述步骤4)中,保温时间为12~24小时。
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