CN111302769A - 一种低铝镁质复合不烧砖及其制备方法 - Google Patents

一种低铝镁质复合不烧砖及其制备方法 Download PDF

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CN111302769A
CN111302769A CN202010098625.1A CN202010098625A CN111302769A CN 111302769 A CN111302769 A CN 111302769A CN 202010098625 A CN202010098625 A CN 202010098625A CN 111302769 A CN111302769 A CN 111302769A
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magnesia
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aluminum
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赵现华
张义先
尹斌
金钊
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Haicheng Lier Maige Xita Material Co ltd
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Abstract

本发明提供了一种低铝镁质复合不烧砖，是由下列重量份数的原料制备而成：0～1mm电熔镁砂25‑30份、1mm～3mm电熔镁砂20‑25份、3mm～5mm电熔镁砂10‑15份、高纯镁砂200目细粉24‑31份、轻烧白云石粉20‑30份、菱镁石粉10‑15份；1mm～3mm的电熔镁铝尖晶石3‑5份、粉末状硼酸1‑3份、铁铝尖晶石细粉1‑3份、锌铝尖晶石细粉1‑3份、α‑Al2O3超微粉2‑4份、碳化钨粉2‑4份；结合剂：2‑4份。本发明生产的不烧砖，代替烧成镁砖、高纯镁砖、镁铝砖，用于石灰窑、水泥窑，具有耐高温、低导热、抗水化、特别高的热震稳定性、隔热性能良好的优点，有效增加使用寿命。

Description

一种低铝镁质复合不烧砖及其制备方法
技术领域
本发明涉及一种低铝镁质复合不烧砖及制备方法,应用于石灰窑、水泥窑预热带及冷却带，以及一些窑炉低导热部位的砌筑。
背景技术
石灰窑、水泥窑预热带和冷却带现多采用高温烧成的镁砖、镁铝砖等作为其耐火材料；做为烧成产品，这些耐火材料生产耗时长，成本高。同时其保温隔热效果并不理想，石灰窑耐材的抗水化与抗热震能力也有待提高。所以利用不烧产品来代替烧成产品是耐火材料发展的必然趋势。
发明内容
本发明的目的在于提供一种低铝镁质复合不烧砖及其制备方法，生产不烧砖，代替烧成镁砖、高纯镁砖、镁铝砖，用于石灰窑、水泥窑，具有耐高温、低导热、抗水化、特别高的热震稳定性、隔热性能良好的优点，有效增加使用寿命。
为了达到上述目的，本发明采用以下技术方案实现：
一种低铝镁质复合不烧砖，是由下列重量份数的原料制备而成：
骨料：0～1mm的98电熔镁砂25-30份、1mm～3mm的98电熔镁砂20-25份、3mm～5mm的98电熔镁砂10-15份、97.5高纯镁砂200目细粉24-31份、轻烧白云石粉20-30份、菱镁石粉10-15份；
辅料：1mm～3mm的电熔镁铝尖晶石3-5份、粉末状硼酸1-3份、铁铝尖晶石细粉1-3份、锌铝尖晶石细粉1-3份、α-Al2O3超微粉2-4份、碳化钨粉2-4份；
结合剂：2-4份。
所述α-Al2O3超微粉为325目，所述粉末状硼酸为180目，所述铁铝尖晶石细粉为200目，所述锌铝尖晶石细粉为200目，所述菱镁石粉的D50值为50～500nm。
所述轻烧白云石粉经水消化后研磨成粒度＜0.044μm的超微粉；
所述结合剂是酚醛树脂。
一种低铝镁质复合不烧砖的制备方法，
1)预混料：先将上述重量份数的97.5高纯镁砂200目细粉、轻烧白云石粉、菱镁石粉进行预混合；
2)将混练好的物料压制成块或球，然后在高温竖窑中煅烧，温度为1800℃～2000℃，保温6～24小时，冷却后破碎成1-3mm的微孔镁砂颗粒；
3)混练：先将上述重量份数的粉末状硼酸、0～1mm的98电熔镁砂、1mm～3mm的98电熔镁砂、3mm～5mm的98电熔镁砂干混≥3min，然后加入结合剂酚醛树脂，再混3～5min，加入上述步骤2)得到的微孔镁砂颗粒、α-Al2O3超微粉、铁铝尖晶石细粉、锌铝尖晶石细粉、碳化钨粉、1mm～3mm的电熔镁铝尖晶石，混15～20min，然后出料；
4)机压成型：采用1000吨压砖机成型；
5)热处理：干燥窑，≥200℃，热处理时间≥24h。
与现有技术相比，本发明的有益效果是：
1)本发明一种低铝镁质复合不烧砖及其制备方法，生产不烧砖，代替烧成镁砖、高纯镁砖、镁铝砖，用于石灰窑、水泥窑，具有耐高温、低导热、抗水化、特别高的热震稳定性、隔热性能良好的优点，有效增加使用寿命。
2)本发明添加的菱镁石微粉在高温下分解产生二氧化碳，留下大量微气孔，可增加不烧砖的微孔率，可有效降低其导热率，隔热性能良好，提高不烧砖的使用性能。粉末状硼酸180目在二次烧结中能起到促烧结作用。因为砌筑窑炉工作中温度相对其他窑炉并不算高，镁铝质不烧砖在工作中二次烧结效果并不理想，而α-Al2O3超微粉、铁铝尖晶石和粉末状硼酸可以在二次烧结过程中起到降低烧成温度的效果，达到促烧结作用,硼酸烧结后会产生空洞，降低砖的导热性，延长不烧砖的使用寿命。
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：
一种低铝镁质复合不烧砖，是由下列重量份数的原料制备而成：
骨料：0～1mm的98电熔镁砂25-30份、1mm～3mm的98电熔镁砂20-25份、3mm～5mm的98电熔镁砂10-15份、97.5高纯镁砂200目细粉24-31份、轻烧白云石粉20-30份、菱镁石粉10-15份；
辅料：1mm～3mm的电熔镁铝尖晶石3-5份、粉末状硼酸1-3份、铁铝尖晶石细粉1-3份、锌铝尖晶石细粉1-3份、α-Al2O3超微粉2-4份、碳化钨粉2-4份；
结合剂：2-4份。
所述α-Al2O3超微粉为325目,所述粉末状硼酸为180目，所述铁铝尖晶石细粉为200目，所述锌铝尖晶石细粉为200目，所述菱镁石粉的D50值为50～500nm。
所述轻烧白云石粉经水消化后研磨成粒度＜0.044μm的超微粉；
所述结合剂是酚醛树脂。
一种低铝镁质复合不烧砖的制备方法，
1)预混料：先将上述重量份数的97.5高纯镁砂200目细粉、轻烧白云石粉、菱镁石粉进行预混合；
2)将混练好的物料压制成块或球，然后在高温竖窑中煅烧，温度为1800℃～2000℃，保温6～24小时，冷却后破碎成1-3mm的微孔镁砂颗粒；
本发明添加的菱镁石微粉在高温下分解产生二氧化碳，留下大量气孔，添加的微粉为纳米级微粉，分解产生气孔多为封闭气孔，且气孔孔径小，可增加不烧砖的微孔率，可有效降低其导热率，隔热性能良好，提高不烧砖的使用性能；
3)混练：先将上述重量份数的粉末状硼酸、0～1mm的98电熔镁砂、1mm～3mm的98电熔镁砂、3mm～5mm的98电熔镁砂干混≥3min，然后加入结合剂酚醛树脂，再混3～5min，加入上述步骤2)得到的微孔镁砂颗粒、α-Al2O3超微粉、铁铝尖晶石细粉、锌铝尖晶石细粉、碳化钨粉、1mm～3mm的电熔镁铝尖晶石，混15～20min，然后出料；
4)机压成型：采用1000吨压砖机成型；
5)热处理：干燥窑，≥200℃，热处理时间≥24h。
本发明用98电熔镁砂为主要原料制作不烧低铝镁质复合砖。添加α-Al2O3超微粉，在生产使用过程中，烧结生成镁铝尖晶石，从而使制品具有更好的抗热震、抗高温等性能，同时生成尖晶石过程中形成体积膨胀，降低镁砂烧结过程中的体积效应；电熔镁铝尖晶石为预合成尖晶石，减少二次烧成过程中过大的体积变化，加入目的是极大的提高热震性能。铁铝尖晶石可以降低二次烧结温度，形成镁铁铝尖晶石，有助于高温性能。粉末状硼酸增加二次烧结过程中低温易溶物的产生，降低二次烧成温度，同时硼酸烧结后会产生孔洞，降低砖的导热性，延长不烧砖的使用寿命；锌铝尖晶石为氧化锌和工业氧化铝通过固相反应法制备，其中按重量百分比含量Al2O3：55wt％-60wt％，ZnO：40wt％-45wt％，锌铝尖晶石具有较低的热膨胀系数，因此引入锌铝尖晶石提高了砖的抗热震稳定性；锌铝尖晶石具有较好的抵抗酸性及碱性渣侵蚀的性能，较好的热态化学稳定性能，避免砖在使用过程中产生因化学变化引起的体积膨胀；碳化钨可提高耐火砖使用过程中的热震稳定性。
实施例见表1；
表1：实施例1-5低铝镁质复合不烧砖的制备配方
原料 例1 例2 例3 例4 例5
98电熔镁砂3-5mm 13份 15份 12份 14.5份 13份
98电熔镁砂1-3mm 20份 21份 22份 24份 23份
98电熔镁砂0-1mm 28份 28份 30份 29份 30份
97.5高纯镁砂200目 31份 29份 30份 25.5份 27份
轻烧白云石粉 21份 22份 25份 28份 29份
菱镁石粉 15份 14份 12份 13份 11份
电熔镁铝尖晶石1-3mm 5份 3份 4份 3.5份 4.5份
α-Al<sub>2</sub>O<sub>3</sub>超微粉 3份 2份 2.5份 4份 3份
粉末状硼酸180目 3份 2.5份 3份 2份 2.5份
铁铝尖晶石200目 1份 1.5份 2份 2.5份 3份
锌铝尖晶石200目 1份 2.5份 2份 3份 1.5份
碳化钨粉 2份 2份 3份 4份 4份
酚醛树脂 3.5份 2.5份 3份 3.5份 2.5份
实施例原料指标见表2
表2：实施例1-5主要原料指标单位：wt％
Figure BDA0002386102950000041

Claims (5)

1.一种低铝镁质复合不烧砖，其特征在于，是由下列重量份数的原料制备而成：
骨料：0～1mm的98电熔镁砂25-30份、1mm～3mm的98电熔镁砂20-25份、3mm～5mm的98电熔镁砂10-15份、97.5高纯镁砂200目细粉24-31份、轻烧白云石粉20-30份、菱镁石粉10-15份；
辅料：1mm～3mm的电熔镁铝尖晶石3-5份、粉末状硼酸1-3份、铁铝尖晶石细粉1-3份、锌铝尖晶石细粉1-3份、α-Al2O3超微粉2-4份、碳化钨粉2-4份；
结合剂：2-4份。
2.根据权利要求1所述的一种低铝镁质复合不烧砖，其特征在于，所述α-Al2O3超微粉为325目,所述粉末状硼酸为180目，所述铁铝尖晶石细粉为200目，所述锌铝尖晶石细粉为200目，所述菱镁石粉的D50值为50～500nm。
3.根据权利要求1所述的一种低铝镁质复合不烧砖，其特征在于，所述轻烧白云石粉经水消化后研磨成粒度＜0.044μm的超微粉。
4.根据权利要求1所述的一种低铝镁质复合不烧砖，其特征在于，所述结合剂是酚醛树脂。
5.一种如权利要求1-4其中任意一项所述的低铝镁质复合不烧砖的制备方法，其特征在于，
1)预混料：先将上述重量份数的97.5高纯镁砂200目细粉、轻烧白云石粉、菱镁石粉进行预混合；
2)将混练好的物料压制成块或球，然后在高温竖窑中煅烧，温度为1800℃～2000℃，保温6～24小时，冷却后破碎成1-3mm的微孔镁砂颗粒；
3)混练：先将上述重量份数的粉末状硼酸、0～1mm的98电熔镁砂、1mm～3mm的98电熔镁砂、3mm～5mm的98电熔镁砂干混≥3min，然后加入结合剂酚醛树脂，再混3～5min，加入上述步骤2)得到的微孔镁砂颗粒、α-Al2O3超微粉、铁铝尖晶石细粉、锌铝尖晶石细粉、碳化钨粉、1mm～3mm的电熔镁铝尖晶石，混15～20min，然后出料；
4)机压成型：采用1000吨压砖机成型；
5)热处理：干燥窑，≥200℃，热处理时间≥24h。
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CN113061045A (zh) * 2021-04-21 2021-07-02 营口丰华耐火材料有限公司 一种水泥窑烧成带用镁铁锌铝复合尖晶石耐火砖及其制备方法
CN113603460A (zh) * 2021-08-27 2021-11-05 郑州瑞泰耐火科技有限公司 一种水泥回转窑烧成带用微气孔镁铁铝尖晶石砖及其制备方法
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CN113603460A (zh) * 2021-08-27 2021-11-05 郑州瑞泰耐火科技有限公司 一种水泥回转窑烧成带用微气孔镁铁铝尖晶石砖及其制备方法
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