CN107266100A - 一种采用镁钙砖细粉制备的MgO‑CaO‑Fe2O3系电炉捣打料 - Google Patents

一种采用镁钙砖细粉制备的MgO‑CaO‑Fe2O3系电炉捣打料 Download PDF

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CN107266100A
CN107266100A CN201710586938.XA CN201710586938A CN107266100A CN 107266100 A CN107266100 A CN 107266100A CN 201710586938 A CN201710586938 A CN 201710586938A CN 107266100 A CN107266100 A CN 107266100A
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magnesia
fine powder
mgo
prepared
calcium brick
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于慧彬
张义先
董会彬
陈东明
金钊
尹斌
王健骁
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Haicheng Zhongxing High-Grade Magnesia Brick Co Ltd
HAICHENG ZHONGXING MAGNESIA SYNTHETIC MATERIALS CO Ltd
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Haicheng Zhongxing High-Grade Magnesia Brick Co Ltd
HAICHENG ZHONGXING MAGNESIA SYNTHETIC MATERIALS CO Ltd
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Abstract

本发明提供了一种采用镁钙砖细粉制备的MgO‑CaO‑Fe2O3系电炉捣打料，是由下列重量份数的原料制备而成：0～0.078mm镁钙砖细粉95份以下、0～0.078mm轻烧镁粉50份以下、铁红6份以下，MgO微粉1～3份、α‑Al2O3微粉1～5份、陶瓷纤维0.5～5份、氧化钛1～1.5份。与现有技术相比，本发明的有益效果是：本发明一种采用镁钙砖细粉制备的MgO‑CaO‑Fe2O3系电炉捣打料，采用镁钙砖细粉、轻烧镁粉和铁红作为主要原料，添加α‑Al2O3微粉、MgO、含有稀土氧化物的陶瓷纤维、氧化钛作为辅料，在压球过程中使用镁钙砖细粉代替部分轻烧镁粉；其制备工艺简单，且既实现了镁钙砖的废物利用，同时又提高了产品的热震稳定性及抗侵蚀性。

Description

一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料
技术领域
本发明涉及耐火材料技术领域，尤其涉及一种以镁钙砖细磨粉制备的MgO-CaO-Fe2O3系电炉捣打料
背景技术
镁钙铁(MgO-CaO-Fe2O3)质干式捣打料是主要用于构筑或修补电弧炉炉底的一种耐火材料，镁钙铁质捣打料具有高密度、高强度、抗冲刷能力强、体积稳定性好、烧结性能好的优点，能够在高温下形成一个坚实的整体烧结层，使用寿命长，施工简单，而且使用时不受炉型尺寸的限制，因此得到了广泛的应用。
常规的镁钙铁质干式捣打料是由预合成的镁钙铁砂和烧结镁砂或电熔镁砂按一定颗粒级配组成混合料，然后进行烧结；其中的镁钙铁砂是由轻烧镁粉与铁红压球后经过煅烧制成，在制备镁钙铁砂的过程中需要耗费大量的能源，而且对环境污染严重。
由于，在生产镁钙砖过程中会有部分镁钙砖在烧成阶段会发生水化，裂纹等缺陷，无法满足使用要求，只能作为废砖丢弃，为了解决这一难题，产生了这种处理镁钙砖的方法。
发明内容
本发明的目的在于提供一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，采用镁钙砖细粉、轻烧镁粉和铁红作为主要原料，添加α-Al2O3微粉、MgO、陶瓷纤维、氧化钛作为辅料；在压球过程中使用镁钙砖细粉代替部分轻烧镁粉，其制备工艺简单，且既实现了镁钙砖的废物利用，同时又提高了产品的热震稳定性及抗侵蚀性。
为了达到上述目的，本发明采用以下技术方案实现：
一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，是由下列重量份数的原料制备而成：0～0.078mm镁钙砖细粉95份以下、0～0.078mm轻烧镁粉50份以下、铁红6份以下，MgO微粉1～3份、α-Al2O3微粉1～5份、陶瓷纤维0.5～5份、氧化钛1～1.5份。
所述陶瓷纤维中主要成份包括氧化铝、氧化锆和氧化镧，三者的重量比为氧化铝：氧化锆：氧化镧＝10～15：3～5：1～2。
所述MgO微粉的粒度为3-5μm，所述α-Al2O3微粉的粒度为1-3μm。
一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料的制备方法，包括如下步骤：
1)将有缺陷的镁钙砖进行破碎，筛分；选取其粒度小于0.078mm的细粉作为原料；
2)按照上述重量份数称重配料；
3)将镁钙砖细粉、轻烧镁粉、铁红进行混炼，混炼18-20min后，加入MgO微粉、α-Al2O3微粉、陶瓷纤维、氧化钛继续混炼12分钟以上；
4)在混料中加入5-6份的水，搅拌成泥料，将混炼完成的泥料进行多次压制，将泥料中的空气排净，压制成球，然后将压制好的矿球放入通风良好的车间进行干燥处理；
5)将干燥完成的矿球放入高温竖窑进行烧制,烧成温度1100℃～1500℃。
6)将烧制好的矿球进行破碎、筛选、混炼、包装。
与现有技术相比，本发明的有益效果是：
本发明一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，采用镁钙砖细粉、轻烧镁粉和铁红作为主要原料，添加α-Al2O3微粉、MgO、含有稀土氧化物的陶瓷纤维、氧化钛作为辅料，在压球过程中使用镁钙砖细粉代替部分轻烧镁粉；其制备工艺简单，且既实现了镁钙砖的废物利用，同时又提高了产品的热震稳定性及抗侵蚀性。
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：
一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，是由下列重量份数的原料制备而成：0～0.078mm镁钙砖细粉95份以下、0～0.078mm轻烧镁粉50份以下、铁红6份以下，MgO微粉1～3份、α-Al2O3微粉1～5份、陶瓷纤维0.5～5份、氧化钛1～1.5份。
所述陶瓷纤维中主要成份包括氧化铝、氧化锆和氧化镧，三者的重量比为氧化铝：氧化锆：氧化镧＝10～15：3～5：1～2。
所述MgO微粉的粒度为3-5μm，所述α-Al2O3微粉的粒度为1-3μm。
镁钙砖细粉和轻烧镁粉的化学指标见表1：
表1：
一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料的制备方法，包括如下步骤：
1)将有缺陷的镁钙砖进行破碎，筛分；选取其粒度小于0.078mm的细粉作为原料；
2)按照上述重量份数称重配料；
3)将镁钙砖细粉、轻烧镁粉、铁红进行混炼，混炼18-20min后，加入MgO微粉、α-Al2O3微粉、陶瓷纤维、氧化钛继续混炼12分钟以上；
4)在混料中加入5-6份的水，搅拌成泥料，将混炼完成的泥料进行多次压制，将泥料中的空气排净，压制成球，然后将压制好的矿球放入通风良好的车间进行干燥处理；
5)将干燥完成的矿球放入高温竖窑进行烧制,烧成温度1100℃～1500℃。
6)将烧制好的矿球进行破碎、筛选、混炼、包装。
成品捣打料的粒度配比见表2：
粒度(mm) 6-3 3-1 1-0 200目
百分比(％) 25-28 26-29 25-30 13-18
见表3为实施例配方：
表3：以镁钙砖细粉为主要原料制作捣打料的配方(实施例1-5)(单位：份)
配料 实施例1 实施例2 实施例3 实施例4 实施例5
镁钙砖细粉 40 50 60 70 95
轻烧镁粉 50 40 30 25 5
铁红 6 5 4 3 2
MgO微粉 1 2 3 3 3
α-Al2O3微粉 1 2 3 4 5
陶瓷纤维 0.5 2 1 3 5
氧化钛 1 1.5 1 1 1
成品捣打料的理化指标见表4：
表4：
本发明一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，在压球过程中使用镁钙砖细粉代替部分轻烧镁粉；其制备工艺简单，实现了镁钙砖的废物利用。
同时添加α-Al2O3微粉和MgO微粉，有效适时控制其在使用过程中的平衡与未平衡的原位反应，使MgO-CaO-Fe2O3系电炉捣打料的抗渗透、耐侵蚀性能与抗剥落性能同时得到提高。
另外在骨料中添加带有稀土氧化物的陶瓷纤维和氧化钛，使捣打料的高温热震稳定性及耐侵蚀性能得到进一步的提高。

Claims (4)

1.一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，其特征在于，是由下列重量份数的原料制备而成：0～0.078mm镁钙砖细粉95份以下、0～0.078mm轻烧镁粉50份以下、铁红6份以下，MgO微粉1～3份、α-Al2O3微粉1～5份、陶瓷纤维0.5～5份、氧化钛1～1.5份。
2.根据权利要求1所述的一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，其特征在于，所述陶瓷纤维中主要成份包括氧化铝、氧化锆和氧化镧，三者的重量比为氧化铝：氧化锆：氧化镧＝10～15：3～5：1～2。
3.根据权利要求1所述的一种采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料，其特征在于，所述MgO微粉的粒度为3-5μm，所述α-Al2O3微粉的粒度为1-3μm。
4.一种如权利要求1所述的采用镁钙砖细粉制备的MgO-CaO-Fe2O3系电炉捣打料的制备方法，其特征在于，包括如下步骤：
1)将有缺陷的镁钙砖进行破碎，筛分；选取其粒度小于0.078mm的细粉作为原料；
2)按照上述重量份数称重配料；
3)将镁钙砖细粉、轻烧镁粉、铁红进行混炼，混炼18-20min后，加入MgO微粉、α-Al2O3微粉、陶瓷纤维、氧化钛继续混炼12分钟以上；
4)在混料中加入5-6份的水，搅拌成泥料，将混炼完成的泥料进行多次压制，将泥料中的空气排净，压制成球，然后将压制好的矿球放入通风良好的车间进行干燥处理；
5)将干燥完成的矿球放入高温竖窑进行烧制,烧成温度1100℃～1500℃。
6)将烧制好的矿球进行破碎、筛选、混炼、包装。
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