CN110759716A - 一种抗渣侵蚀的钢包熔池用镁碳砖及其制备方法 - Google Patents

一种抗渣侵蚀的钢包熔池用镁碳砖及其制备方法 Download PDF

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CN110759716A
CN110759716A CN201911236812.5A CN201911236812A CN110759716A CN 110759716 A CN110759716 A CN 110759716A CN 201911236812 A CN201911236812 A CN 201911236812A CN 110759716 A CN110759716 A CN 110759716A
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slag
percent
equal
molten pool
carbon brick
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马四凯
李洪波
李维锋
魏振国
邹新国
李勇伟
孙佳琛
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SHANGHAI LIRR REFRACTORY CO Ltd
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Abstract

本发明的一种抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，包括如下质量分数的组分：电熔镁砂颗粒：50%～70%，电熔镁砂细粉：5%～20%，铝铬渣：5%～20%，金属铝粉：1%～5%，金属硅粉：1%～5%，鳞片石墨：10%～15%，结合剂：2%～4%。本发明的抗渣侵蚀的钢包熔池用镁碳砖具有显著提高的抗渣侵蚀性能；本方法减少了对电熔镁砂资源消耗，环保效应更明显，还可以降低生产成本。

Description

一种抗渣侵蚀的钢包熔池用镁碳砖及其制备方法
技术领域
本发明为耐火材料技术领域，具体涉及一种抗渣侵蚀的钢包熔池用镁碳砖及其制备方法。
背景技术
钢包熔池砖是一种含碳复合耐火材料，因具有高抗渣侵能力、高抗热震性、高抗剥落性以及不易被炉渣和钢液润湿，因而在钢铁冶金领域得到广泛的应用，但随着炼钢工艺的发展，钢种洁净度要求越来越严，这就对炼钢工艺提出了更苛刻的要求：炉外精炼种类越来越多，精炼时间越来越长，同时钢水在钢包容器中周转时间延长，这就对钢包熔池砖提出了更高的质量和寿命要求。
铝铬渣是铝热还原法冶铬过程中产生的一种固体废弃物，危害生态环境和人类健康。铝铬渣中氧化铝含量很高，铬也多以氧化铬形式存在，氧化铝是性能优良的耐火氧化物，氧化铬抗酸性渣侵蚀能力强。若将铝铬渣作为耐火原料应用于钢包熔池砖中，这既能减轻环保的压力，又能缓解优质耐火原料价格高企的现状，一举两得。
发明内容
本发明提供了一种抗渣侵蚀的钢包熔池用镁碳砖及其制备方法，在钢包熔池砖中加入一定量的铝铬渣，提高钢包熔池砖抗渣侵蚀性能，减少对电熔镁砂资源消耗，降低生产成本。
为了实现上述目的，本发明的技术方案是：
一种抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，包括如下质量分数的组分：电熔镁砂颗粒：50％～70％，电熔镁砂细粉：5％～20％，铝铬渣：5％～20％，金属铝粉：1％～5％，金属硅粉：1％～5％，鳞片石墨：10％～15％，结合剂：2％～4％；
所述电熔镁砂颗粒的粒度级配为5～3mm、3～1mm、1～0.075mm，所述的三种粒度级配的质量比为(2～6)：(2～5)：(2～4)，电熔镁砂化学组成所占的质量百分比例为MgO≥96.3％、CaO≤1.4％、SiO2≤1.4％，体积密度≥3.45g/cm3；
所述电熔镁砂细粉的粒度为120～400目，所述电熔镁砂化学组成所占的质量百分比例为MgO≥97.2％，CaO≤1.0％，SiO2≤1.0％，体积密度≥3.50g/cm3；
所述铝铬渣颗粒的粒度级配为5～3mm、3～1mm、1～0.075mm，所述的三种粒度级配的质量比为(1～2)：(1～2)：(1～2)，铝铬渣化学组成所占的质量百分比例为Al2O3≥80％，Cr2O3≥10％，体积密度≥3.35g/cm3；
所述金属铝粉的粒度为120～400目，其纯度按质量百分比Al≥99％；
所述金属硅粉的粒度为120～400目，其纯度按质量百分比Si≥97％；
所述鳞片石墨的粒度为100～120目，鳞片石墨化学组成所占的质量百分比例为C≥95.0％，灰分≤0.7％，水分≤0.5％；
所述结合剂为热固型酚醛树脂。
本发明还提供了所述的抗渣侵蚀的钢包熔池用镁碳砖的制备方法，其特征在于，包括以下步骤：
(1)混料：把所述电熔镁砂颗粒和所述铝铬渣干混3～10分钟，再缓慢加入所述结合剂的苯酚溶液，继续干混3～7分钟；再加入所述鳞片石墨，继续干混7～15分钟；最后加入所述电熔镁砂细粉、金属铝粉、金属硅粉，持续混炼35～60分钟出料，得到预压料；
(2)成型：将步骤(1)得到的预压料加入到模具中压制成型制成半成品砖坯，压力为6300～10000KN；
(3)烘烤：将步骤(2)得到的半成品砖坯进行烘烤固化，烘烤温度为180～250℃，烘烤时间为12～24h；冷却，出料，即可得到本发明的抗渣侵蚀的钢包熔池用镁碳砖。
进一步地，所述结合剂的苯酚溶液的固含量≥80％。
本发明的有益效果如下：
本发明通过在钢包熔池砖中加入一定量的铝铬渣，在高温条件下，铝铬渣中的三氧化二铝和三氧化二铬与熔池砖中的氧化镁原位反应生成镁铝尖晶石和镁铬尖晶石；由于镁铝尖晶石和镁铬尖晶石优良的抗渣渗透性能和热震稳定性能，和现有钢包熔池砖性能相比，不仅本发明的抗渣侵蚀的钢包熔池用镁碳砖具有显著提高的抗渣侵蚀性能，而且，本发明的方法也减少对电熔镁砂资源消耗，环保效应更明显，还可以降低生产成本。
具体实施方式
本技术领域的一般技术人员应当认识到本实施例仅是用来说明本发明，而并非用作对本发明的限定，只要在本发明的实施范围内对实施例进行变换、变型都可在本发明权利要求的范围内。
本实施例中所用原料均为市售。
实施例1
一种抗渣侵蚀的钢包熔池用镁碳砖，包括如下质量分数的组分：电熔镁砂颗粒为50％，电熔镁砂细粉为13％，铝铬渣为14.5％，金属铝粉3.2％，金属硅粉3.5％，鳞片石墨13.3％，外加结合剂2.5％。
(1)混料：把所述电熔镁砂颗粒和铝铬渣加入到混料机中干混5分钟，再缓慢加入所述结合剂的苯酚溶液(固含量80％)，继续干混5分钟；再加入所述鳞片石墨，继续干混8分钟，最后加入所述电熔镁砂细粉、金属铝粉、金属硅粉持续混炼40分钟出料，得到预压料；
(2)成型：将步骤(1)得到的预压料加入到模具中压制成型制成半成品砖坯，压力为8000KN；
(3)烘烤：将步骤(2)得到的半成品砖坯放入干燥窑中烘烤固化，烘烤温度为220℃，烘烤时间为24h；冷却，出料，即可得到本发明的抗渣侵蚀的钢包熔池用镁碳砖。
实施例2
一种抗渣侵蚀的钢包熔池用镁碳砖，包括如下质量分数的组分：电熔镁砂颗粒为56％，电熔镁砂细粉为15％，铝铬渣为11.2％，金属铝粉1.5％，金属硅粉2％，鳞片石墨10.5％，外加结合剂3.8％。
(1)混料：把所述电熔镁砂颗粒和铝铬渣加入到混料机中干混3分钟，再缓慢加入所述结合剂的苯酚溶液(固含量85％)，继续干混3分钟；再加入所述鳞片石墨，继续干混7分钟，最后加入所述电熔镁砂细粉、金属铝粉、金属硅粉持续混炼60分钟出料，得到预压料；
(2)成型：将步骤(1)得到的预压料加入到模具中压制成型制成半成品砖坯，压力为10000KN；
(3)烘烤：将步骤(2)得到的半成品砖坯放入干燥窑中烘烤固化，烘烤温度为250℃，烘烤时间为12h；冷却，出料，即可得到本发明的抗渣侵蚀的钢包熔池用镁碳砖。
实施例3
一种抗渣侵蚀的钢包熔池用镁碳砖，包括如下质量分数的组分：电熔镁砂颗粒为58.8％，电熔镁砂细粉为15.5％，铝铬渣为8.7％，金属铝粉1％，金属硅粉1％，鳞片石墨11.6％，结合剂3.4％。
(1)混料：把所述电熔镁砂颗粒和铝铬渣加入到混料机中干混10分钟，再缓慢加入所述结合剂的苯酚溶液(固含量80.3％)，继续干混5分钟；再加入所述鳞片石墨，继续干混15分钟，最后加入所述电熔镁砂细粉、金属铝粉、金属硅粉持续混炼35分钟出料，得到预压料；
(2)成型：将步骤(1)得到的预压料加入到模具中压制成型制成半成品砖坯，压力为7000KN；
(3)烘烤：将步骤(2)得到的半成品砖坯放入干燥窑中烘烤固化，烘烤温度为180℃，烘烤时间为24h；冷却，出料，即可得到本发明的抗渣侵蚀的钢包熔池用镁碳砖。
实施例4
一种抗渣侵蚀的钢包熔池用镁碳砖，包括如下质量分数的组分：电熔镁砂颗粒为62.6％，电熔镁砂细粉为17％，铝铬渣为5.0％，金属铝粉1.8％，金属硅粉1％，鳞片石墨10.3％，结合剂2.3％。
(1)混料：把所述电熔镁砂颗粒和铝铬渣加入到混料机中干混8分钟，再缓慢加入所述结合剂的苯酚溶液(固含量83.5％)，继续干混6分钟；再加入所述鳞片石墨，继续干混13分钟，最后加入所述电熔镁砂细粉、金属铝粉、金属硅粉持续混炼50分钟出料，得到预压料；
(2)成型：将步骤(1)得到的预压料加入到模具中压制成型制成半成品砖坯，压力为9500KN；
(3)烘烤：将步骤(2)得到的半成品砖坯放入干燥窑中烘烤固化，烘烤温度为245℃，烘烤时间为18h；冷却，出料，即可得到本发明的抗渣侵蚀的钢包熔池用镁碳砖。
将实施例1～4得到的镁碳砖进行检测，其中：侵蚀指数是指镁碳砖渣侵蚀面积占整个试样面积百分比，检测数据如表1。
表1实施例1～4的检测数据
Figure BDA0002305110970000061
本发明的抗渣侵蚀的钢包熔池用镁碳砖在某钢厂100吨钢包熔池部位试验，试验过程中熔池表面光滑，侵蚀均匀，无开裂现象，通过对试验的数据进行统计平均炉数为126炉，试验的熔池砖侵蚀速率为0.95mm/炉，现有熔池砖侵蚀速率为1.18mm/炉，通过两者侵蚀速率数据进行对比，说明本发明中通过加入铝铬渣能够明显提高钢包熔池砖抗渣侵蚀性能和高温抗折强度，从而降低成本。

Claims (10)

1.一种抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，包括如下质量分数的组分：电熔镁砂颗粒：50%～70%，电熔镁砂细粉：5%～20%，铝铬渣：5%～20%，金属铝粉：1%～5%，金属硅粉：1%～5%，鳞片石墨：10%～15%，结合剂：2%～4%。
2.根据权利要求1所述的抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，所述电熔镁砂颗粒的粒度级配为5～3mm、3～1mm、1～0.075mm，所述的三种粒度级配的质量比为（2～6）：（2～5）：（2～4），电熔镁砂化学组成所占的质量百分比例为MgO≥96.3%、CaO≤1.4%、SiO2≤1.4%，体积密度≥3.45g/cm3。
3.根据权利要求1所述的抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，所述电熔镁砂细粉的粒度为120～400目，所述电熔镁砂化学组成所占的质量百分比例为MgO≥97.2%，CaO≤1.0%，SiO2≤1.0%，体积密度≥3.50g/cm3。
4.根据权利要求1所述的抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，所述铝铬渣颗粒的粒度级配为5～3mm、3～1mm、1～0.075mm，所述的三种粒度级配的质量比为（1～2）：（1～2）：（1～2），铝铬渣化学组成所占的质量百分比例为Al2O3≥80%，Cr2O3≥10%，体积密度≥3.35g/cm3。
5.根据权利要求1所述的抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，所述金属铝粉的粒度为120～400目，其纯度按质量百分比Al≥99%。
6.根据权利要求1所述的抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，所述金属硅粉的粒度为120～400目，其纯度按质量百分比Si≥97%。
7.根据权利要求1所述的抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，所述鳞片石墨的粒度为100～120目，鳞片石墨化学组成所占的质量百分比例为C≥95.0%，灰分≤0.7%，水分≤0.5%。
8.根据权利要求1所述的抗渣侵蚀的钢包熔池用镁碳砖，其特征在于，所述结合剂为热固型酚醛树脂。
9.一种如权利要求1～8任意一项所述的钢包熔池用镁碳砖的制备方法，其特征在于，包括以下步骤：
（1）混料：把所述电熔镁砂颗粒和所述铝铬渣干混3～10分钟，再缓慢加入所述结合剂的苯酚溶液，继续干混3～7分钟；再加入所述鳞片石墨，继续干混7～15分钟；最后加入所述电熔镁砂细粉、金属铝粉、金属硅粉，持续混炼35～60分钟出料，得到预压料；
（2）成型：将步骤（1）得到的预压料加入到模具中压制成型制成半成品砖坯，压力为6300～10000KN；
（3）烘烤：将步骤（2）得到的半成品砖坯进行烘烤固化，烘烤温度为180～250℃，烘烤时间为12～24h；冷却，出料，即可得到本发明的抗渣侵蚀的钢包熔池用镁碳砖。
10.根据权利要求1所述的制备方法，其特征在于，所述结合剂的苯酚溶液的固含量≥80%。
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