CN110937905B - 一种高抗热震性复合窑口浇注料 - Google Patents

一种高抗热震性复合窑口浇注料 Download PDF

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CN110937905B
CN110937905B CN201911082057.XA CN201911082057A CN110937905B CN 110937905 B CN110937905 B CN 110937905B CN 201911082057 A CN201911082057 A CN 201911082057A CN 110937905 B CN110937905 B CN 110937905B
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朱国平
王立旺
向若飞
朱其良
李新明
王琪
彭晶晶
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Zhejiang Kingcred New Material Co ltd
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Abstract

本发明涉及一种高抗热震性复合窑口浇注料,包括以下各组分及重量份:镁铁砖颗粒13~25份、镁铝砖颗粒15~25份、红柱石10~15份、堇青石18~28份、氧化铝粉10~20份、硅灰3~5份、轻烧氧化镁粉5~10份、络合镁铝胶结剂4~8份。本发明通过采用上述配方,具有抗热震稳定性好、力学强度和耐化学侵蚀性佳、气孔率低,使用寿命长等优点。

Description

一种高抗热震性复合窑口浇注料
技术领域
本发明属于耐火材料技术领域,具体涉及一种高抗热震性复合窑口浇注料。
背景技术
在新型干法水泥烧成系统中,窑口是十分关键和特殊的部位,该部位使用条件苛刻而复杂,衬体材料损坏较快,而衬体的更换必须要在停窑冷却后才能进行,因此,窑口衬体的好坏直接制约着熟料烧成系统的运转率和水泥熟料的产量。目前,国内大型干法窑窑口用耐火浇注料的平均使用寿命为6~8个月,难以与烧成带耐火砖的寿命同步,然而由于影响窑口浇注料使用效果的因素非常多,许多浇注料的使用情况并不十分稳定,因为窑口浇注料的事故原因而导致停窑检修并降低运转率的事件经常发生。另外,随着工艺和设备的进步、操作水平的提高以及烧成带耐火砖的技术改进,烧成带耐火砖的使用寿命正在逐渐增加,必然要求窑口浇注料的寿命要进一步增加。
目前窑口用耐火材料在材质上广泛采用刚玉质和高铝质钢纤维增强耐火浇注料,这种产品属偏酸性材料,容易与碱性的熟料发生化学反应,而且该产品抗热震稳定性也较差,一般情况下,铝硅质耐火浇注料在回转窑口处的使用寿命不超过8个月。通常窑口浇注料中的铝含量高、强度高,但抗热震性差、易开裂剥落,使用寿命无法保证。申请号为201510511622.5的中国专利申请、专利号为ZL200410014658.4的中国专利中均采用添加碳化硅的方法提高窑口浇注料的抗热震性和抗侵蚀性,但存在使用过程中容易氧化的问题。目前已有专利号为ZL201210048037.2的中国专利、专利号为ZL201510763835.7的中国专利、申请号为200810122034.2的中国专利申请中采用尖晶石作为原料制备窑口浇注料,但直接采用尖晶石作为原料引起材料成本增加,高温下也不能生成原位尖晶石结合相,而且所采用的结合剂多数为铝酸钙水泥,与主体材料在成分上也不能完全匹配。
发明内容
本发明所要解决的技术问题在于提供一种抗热震稳定性好、力学强度和耐化学侵蚀性佳、气孔率低,使用寿命长的高抗热震性复合窑口浇注料。
为解决上述技术问题,本发明提供的一种高抗热震性复合窑口浇注料,包含以下各组分及重量份:
优选地,所述镁铁砖颗粒包括粒度为8~15mm、5~8mm两种规格,各种规格的重量份如下:
8~15mm镁铁砖颗粒 5~10份。
5~8mm镁铁砖颗粒 8~15份。
优选地,所述镁铁砖颗粒为回收镁铁砖,其MgO的质量百分含量不小于 80%。
优选地,所述镁铝砖颗粒的粒度为3~5mm。
优选地,所述镁铝砖颗粒为为回收镁铝砖,其MgO的质量百分含量不小于85%。
优选地,所述红柱石的粒度为1~3mm。
优选地,所述堇青石的粒度为0~1mm。
优选地,所述络合镁铝胶结剂中Al2O3的质量百分含量不小于45%,MgO 的质量百分含量不小于1.5%。
本发明的有益效果在于:
1、采用本发明配方制备的高抗热震性复合窑口浇注料,具有良好的挂窑皮性能,当浇注料与水泥熟料接触后,熟料中的CaO就会和浇注料中的Fe2O3作用,生成C2F,C2F的熔点低,对窑口材料有良好的润湿作用,在一定条件下能够粘接水泥熟料和窑口耐火材料,并使窑口粘裹上更多熟料,从而在窑口表面形成坚固的窑皮,起到了保护窑口和延长窑口使用寿命的作用。
2、本发明采用络合镁铝胶结剂不会引入杂质成分,其加水后形成的溶胶有着很好的胶结性,使泥料有着很好的流动性和一定的可塑性,易于施工;在常温下水化后具有胶结作用,干燥后形成的穿插式结构镶嵌在颗粒与细粉之间,使浇注料具有理想的结合强度,同时在高温下,络合镁铝胶结剂还能起到促进烧结和提高抗侵蚀的作用。
3、本发明基质中的成分能够反应生成尖晶石和堇青石的复合结构,不但具有结合强度高、工作性能好等特点,而且具有良好的抗热震稳定性和良好的抗化学侵蚀性,制备成窑口衬体的气孔率较低,可阻止碱性物质向窑口衬体材料内部的渗透,降低衬体材料开裂和剥落的程度,很好的满足了窑口的使用条件要求,在窑口的使用寿命将达到一年,显著提高了水泥窑生产线的运转效率。
4、本发明采用回收的镁铁砖和镁铝砖作为窑口浇注料的原材料,降低固体废弃物的排放,提高资源利用率。
具体实施方式
实施例1
一种高抗热震性复合窑口浇注料,包含以下各组分及重量份:
其中,所述镁铁砖颗粒为回收镁铁砖,其MgO的质量百分含量不小于80%;所述镁铝砖颗粒为为回收镁铝砖,其MgO的质量百分含量不小于85%;所述络合镁铝胶结剂中Al2O3的质量百分含量不小于45%,MgO的质量百分含量不小于1.5%。
实施例2
一种高抗热震性复合窑口浇注料,包含以下各组分及重量份:
其中,所述镁铁砖颗粒为回收镁铁砖,其MgO的质量百分含量不小于80%;所述镁铝砖颗粒为为回收镁铝砖,其MgO的质量百分含量不小于85%;所述络合镁铝胶结剂中Al2O3的质量百分含量不小于45%,MgO的质量百分含量不小于1.5%。
实施例3
一种高抗热震性复合窑口浇注料,包含以下各组分及重量份:
其中,所述镁铁砖颗粒为回收镁铁砖,其MgO的质量百分含量不小于80%;所述镁铝砖颗粒为为回收镁铝砖,其MgO的质量百分含量不小于85%;所述络合镁铝胶结剂中Al2O3的质量百分含量不小于45%,MgO的质量百分含量不小于1.5%。
实施例4
一种高抗热震性复合窑口浇注料,包含以下各组分及重量份:
其中,所述镁铁砖颗粒为回收镁铁砖,其MgO的质量百分含量不小于80%;所述镁铝砖颗粒为为回收镁铝砖,其MgO的质量百分含量不小于85%;所述络合镁铝胶结剂中Al2O3的质量百分含量不小于45%,MgO的质量百分含量不小于1.5%。
上述实施例1-4所制备的高抗热震性复合窑口浇注料性能如下:
采用本发明配方制备的高抗热震性复合窑口浇注料,具有良好的挂窑皮性能,当浇注料与水泥熟料接触后,熟料中的CaO就会和浇注料中的Fe2O3作用,生成C2F,C2F的熔点低,对窑口材料有良好的润湿作用,在一定条件下能够粘接水泥熟料和窑口耐火材料,并使窑口粘裹上更多熟料,从而在窑口表面形成坚固的窑皮,起到了保护窑口和延长窑口使用寿命的作用。
本发明采用络合镁铝胶结剂不会引入杂质成分,其加水后形成的溶胶有着很好的胶结性,使泥料有着很好的流动性和一定的可塑性,易于施工;在常温下水化后具有胶结作用,干燥后形成的穿插式结构镶嵌在颗粒与细粉之间,使浇注料具有理想的结合强度,同时在高温下,络合镁铝胶结剂还能起到促进烧结和提高抗侵蚀的作用。
本发明基质中的成分能够反应生成尖晶石和堇青石的复合结构,不但具有结合强度高、工作性能好等特点,而且具有良好的抗热震稳定性和良好的抗化学侵蚀性,制备成窑口衬体的气孔率较低,可阻止碱性物质向窑口衬体材料内部的渗透,降低衬体材料开裂和剥落的程度,很好的满足了窑口的使用条件要求,在窑口的使用寿命将达到一年,显著提高了水泥窑生产线的运转效率。
本发明采用回收的镁铁砖和镁铝砖作为窑口浇注料的原材料,降低固体废弃物的排放,提高资源利用率。
上述说明是示例性的而非限制性的。通过上述说明本领域技术人员可以意识到本发明的许多种改变和变形,其也将落在本发明的实质和范围之内。

Claims (6)

1.一种高抗热震性复合窑口浇注料,其特征在于,包含以下各组分及重量份:
镁铁砖颗粒 13~25份
镁铝砖颗粒 15~25份
红柱石 10~15份
堇青石 18~28份
氧化铝粉 10~20份
硅灰 3~5份
轻烧氧化镁粉 5~10份
络合镁铝胶结剂 4~8份;
所述镁铁砖颗粒包括粒度为8~15mm、5~8mm两种规格,各种规格的重量份如下:
8~15mm镁铁砖颗粒 5~10份
5~8mm镁铁砖颗粒 8~15份;
所述镁铁砖颗粒为回收镁铁砖,其MgO的质量百分含量不小于80%。
2.根据权利要求1所述的高抗热震性复合窑口浇注料,其特征在于,所述镁铝砖颗粒的粒度为3~5mm。
3.根据权利要求1或2所述的高抗热震性复合窑口浇注料,其特征在于,所述镁铝砖颗粒为回收镁铝砖,其MgO的质量百分含量不小于85%。
4.根据权利要求1所述的高抗热震性复合窑口浇注料,其特征在于,所述红柱石的粒度为1~3mm。
5.根据权利要求1所述的高抗热震性复合窑口浇注料,其特征在于,所述堇青石的粒度为0~1mm。
6.根据权利要求1所述的高抗热震性复合窑口浇注料,其特征在于,所述络合镁铝胶结剂中Al2O3的质量百分含量不小于45%,MgO的质量百分含量不小于1.5%。
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