CN106187228A - 一种高镁尖晶石及其制备方法和应用 - Google Patents

一种高镁尖晶石及其制备方法和应用 Download PDF

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CN106187228A
CN106187228A CN201610540353.XA CN201610540353A CN106187228A CN 106187228 A CN106187228 A CN 106187228A CN 201610540353 A CN201610540353 A CN 201610540353A CN 106187228 A CN106187228 A CN 106187228A
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magnesia spinel
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冯钢军
齐跃坤
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Henan Hecheng New Inorganic Materials Co Ltd
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Abstract

本发明属于耐火材料行业，尤其涉及尖晶石领域中的一种高镁尖晶石及其制备方法和应用。所述高镁尖晶石，由下述质量配比的组分制成：Al2O3 15‑38%、Fe2O3 0.1%‑0.8%、SiO2 0.1%‑0.8%、Na2O 0.1%‑0.5%、CaO 0.5%‑1.5%，余量为MgO。本发明中的氧化镁组分质量含量高达58‑82wt%，大大提高了尖晶石的熔点。同样的，采用高镁尖晶石作为主要成分制成的镁铝尖晶石砖的熔点也随之大大提高，这就使得镁铝尖晶石砖制成的高温窑具有良好的耐火性能、热震稳定性和抗剥落性。

Description

一种高镁尖晶石及其制备方法和应用
技术领域
本发明属于耐火材料行业，尤其涉及尖晶石领域中的一种高镁尖晶石及其制备方法和应用。
背景技术
镁铝尖晶石的主要化学成分为氧化铝和氧化镁，具有良好的抗侵蚀能力、抗磨蚀能力和热震稳定性，其最大的用途是代替镁铬砂制造镁铝尖晶石砖用于水泥回转窑的建造，不但避免了铬公害，而且具有良好的抗剥落性。现有技术中的镁铝尖晶石的化学组成中，氧化铝含量都高达60%以上，氧化镁含量最高在35%左右，现有的此类镁铝尖晶石为主料制备成的耐火材料难以完全满足水泥回转窑的高耐火性能和热震稳定性能的要求。
发明内容
本发明的目的是提供一种高镁尖晶石及其制备方法和应用，本发明制得的高镁尖晶石相对现有技术具有更加优越的耐火度和热震稳定性能，进而延长水泥回转窑的使用寿命。
为解决上述技术问题，本发明采用的技术方案如下：
设计一种高镁尖晶石，由下述质量配比的组分制成：
Al2O3 15-38%、Fe2O3 0.1%-0.8%、SiO2 0.1%-0.8%、Na2O 0.1%-0.5%、CaO 0.5%-1.5%，余量为MgO。
作为优选的技术方案，所述高镁尖晶石由下述质量配比的组分制成：Al2O3 25%、Fe2O3 0.8%、SiO2 0.8%、Na2O 0.5%、CaO 1.5%，余量为MgO。
上述高镁尖晶石的制备方法如下：
1）按照各组分的质量配比取工业氧化铝粉和轻烧镁粉，其中工业氧化铝粉的质量组分配比为：Al2O3≥98.5%，Fe2O3≤0.2%，SiO2≤0.2%，Na2O≤0.2%，余量为杂质；轻烧镁粉的质量组分配比为：Al2O3≤1.0%、MgO≥95%、CaO≤1.5%、Fe2O3≤0.5%，SiO2≤0.5%，Na2O≤0.5%，余量为杂质；
2）采用行星式强制搅拌机，对原料进行不低于10分钟的搅拌，搅拌机的转速为80-120转/分；将混合后的原料在电炉内加热至熔融态，然后将熔融态物质水冷至固态并破碎至颗粒即得所述高镁尖晶石。
进一步的，所述步骤1）中，所述工业氧化铝粉的粒度为0-200目，轻烧镁粉的粒度为0-3mm。
进一步的，所述步骤2）中，电炉的电压为120-170V，电流5000-8000A。
进一步的，所述步骤2）中，采用喷淋水对熔融态物质进行48小时的冷却。
进一步的，所述步骤2）中，采用颚式破碎机对冷却后的物质进行破碎至颗粒粒径为0.25mm-2.5mm。破碎后的物质通过磁选机后加塑料内衬包装为25kg/袋或1吨/袋的成品即可。
上述高镁尖晶石在耐火材料中的应用。较为常见的，高镁尖晶石通常应用于耐火砖的制备，例如：以高镁尖晶石为主原料，混合一部分其他原料和结合剂，经高压，高温烧结得到高镁尖晶石砖，应用在水泥回转窑烧成带上，可以代替现有的镁铬砖和镁铁铝尖晶石砖，不但避免了铬公害，而且具有更优异的抗剥落性和抗热震稳定性。
本发明所述高镁尖晶石是对现有技术中的镁铝尖晶石的组分进行优化调整后的产品，两者的组分对比如下：
表1 本发明与现有产品的组分对比
本发明中的氧化镁组分质量含量高达58-82wt%，由于氧化铝的熔点为2050度，MgO的熔点在 2800度，所以大大提高了尖晶石的熔点。同样的，采用高镁尖晶石作为主要成分制成的镁铝尖晶石砖的熔点也随之大大提高，这就使得镁铝尖晶石砖制成的高温窑具有良好的耐火性能、热震稳定性和抗剥落性。
本发明与现有技术相比，具有如下优点：
本发明通过调高镁铝尖晶石中MgO含量，克服镁铝尖晶石制得的耐火材料在水泥回转窑内高温下易融化和体积变化的难题，使得水泥回转窑的耐火度和热震稳定性及抗剥落性进一步提高，延长水泥回转窑的使用寿命。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合具体实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例1
一种高镁尖晶石，由下述质量配比的组分制成：Al2O3 38%、Fe2O3 0.8%、SiO2 0.8%、Na2O0.5%、CaO 1.5%，余量为MgO。
其制备方法如下：1）按照各组分的质量配比取工业氧化铝粉和轻烧镁粉，其中工业氧化铝粉的质量组分配比为：Al2O3≥98.5%，Fe2O3≤0.2%，SiO2≤0.2%，Na2O≤0.2%，余量为杂质；轻烧镁粉的质量组分配比为：Al2O3≤1.0%、MgO≥95%、CaO≤1.5%、Fe2O3≤0.5%，SiO2≤0.5%，Na2O≤0.5%，余量为杂质，所述工业氧化铝粉的粒度为0-200目，轻烧镁粉的粒度为0-3mm。
2）采用行星式强制搅拌机，对原料进行不低于10分钟的搅拌，搅拌机的转速为80转/分；将混合后的原料在电炉内加热至熔融态，电炉的电压为120V，电流5000A，然后将熔融态物质采用喷淋水进行48小时的冷却至固态，然后通过颚式破碎机对冷却后的物质进行破碎至颗粒粒径为0.25mm-2.5mm。破碎后的物质通过磁选机后加塑料内衬包装为25kg/袋或1吨/袋的成品即得所述高镁尖晶石。
实施例2
一种高镁尖晶石，由下述质量配比的组分制成：Al2O3 15%、Fe2O3 0.8%、SiO2 0.8%、Na2O0.5%、CaO 1.5%，余量为MgO。
其制备方法如下：1）按照各组分的质量配比取工业氧化铝粉和轻烧镁粉，其中工业氧化铝粉的质量组分配比为：Al2O3≥98.5%，Fe2O3≤0.2%，SiO2≤0.2%，Na2O≤0.2%，余量为杂质；轻烧镁粉的质量组分配比为：Al2O3≤1.0%、MgO≥95%、CaO≤1.5%、Fe2O3≤0.5%，SiO2≤0.5%，Na2O≤0.5%，余量为杂质，所述工业氧化铝粉的粒度为0-200目，轻烧镁粉的粒度为0-3mm。
2）采用行星式强制搅拌机，对原料进行不低于10分钟的搅拌，搅拌机的转速为120转/分；将混合后的原料在电炉内加热至熔融态，电炉的电压为170V，电流8000A，然后将熔融态物质采用喷淋水进行48小时的冷却至固态，然后通过颚式破碎机对冷却后的物质进行破碎至颗粒粒径为0.25mm-2.5mm。破碎后的物质通过磁选机后加塑料内衬包装为25kg/袋或1吨/袋的成品即得所述高镁尖晶石。
实施例3
一种高镁尖晶石，由下述质量配比的组分制成：Al2O3 23%、Fe2O3 0.8%、SiO2 0.8%、Na2O0.5%、CaO 1.5%，余量为MgO。
其制备方法如下：1）按照各组分的质量配比取工业氧化铝粉和轻烧镁粉，其中工业氧化铝粉的质量组分配比为：Al2O3≥98.5%，Fe2O3≤0.2%，SiO2≤0.2%，Na2O≤0.2%，余量为杂质；轻烧镁粉的质量组分配比为：Al2O3≤1.0%、MgO≥95%、CaO≤1.5%、Fe2O3≤0.5%，SiO2≤0.5%，Na2O≤0.5%，余量为杂质，所述工业氧化铝粉的粒度为0-200目，轻烧镁粉的粒度为0-3mm。
2）采用行星式强制搅拌机，对原料进行不低于10分钟的搅拌，搅拌机的转速为100转/分；将混合后的原料在电炉内加热至熔融态，电炉的电压为170V，电流8000A，然后将熔融态物质采用喷淋水进行48小时的冷却至固态，然后通过颚式破碎机对冷却后的物质进行破碎至颗粒粒径为0.25mm-2.5mm。破碎后的物质通过磁选机后加塑料内衬包装为25kg/袋或1吨/袋的成品即得所述高镁尖晶石。

Claims (8)

1.一种高镁尖晶石，其特征在于由下述质量配比的组分制成：
Al2O3 15-38%、Fe2O3 0.1%-0.8%、SiO2 0.1%-0.8%、Na2O 0.1%-0.5%、CaO 0.5%-1.5%，余量为MgO。
2.如权利要求1所述的高镁尖晶石，其特征在于由下述质量配比的组分制成：Al2O3 25%、Fe2O3 0.8%、SiO2 0.8%、Na2O 0.5%、CaO 1.5%，余量为MgO。
3.权利要求1-2所述高镁尖晶石的制备方法，其特征在于，主要步骤如下：
1）按照各组分的质量配比取工业氧化铝粉和轻烧镁粉，其中工业氧化铝粉的质量组分配比为：Al2O3≥98.5%，Fe2O3≤0.2%，SiO2≤0.2%，Na2O≤0.2%，余量为杂质；轻烧镁粉的质量组分配比为：Al2O3≤1.0%、MgO≥95%、CaO≤1.5%、Fe2O3≤0.5%，SiO2≤0.5%，Na2O≤0.5%，余量为杂质；
2）采用行星式强制搅拌机，对原料进行不低于10分钟的搅拌，搅拌机的转速为80-120转/分；将混合后的原料在电炉内加热至熔融态，然后将熔融态物质水冷至固态并破碎至颗粒即得所述高镁尖晶石。
4.权利要求3所述高镁尖晶石的制备方法，其特征在于，所述步骤1）中，所述工业氧化铝粉的粒度为0-200目，轻烧镁粉的粒度为0-3mm。
5.如权利要求3所述高镁尖晶石的制备方法，其特征在于，所述步骤2）中，电炉的电压为120-170V，电流5000-8000A。
6.如权利要求3所述高镁尖晶石的制备方法，其特征在于，所述步骤2）中，采用喷淋水对熔融态物质进行48小时的冷却。
7.如权利要求3所述高镁尖晶石的制备方法，其特征在于，所述步骤2）中，采用颚式破碎机对冷却后的物质破碎至颗粒粒径为0.25mm-2.5mm。
8.如权利要求1-2所述的高镁尖晶石在耐火材料中的应用。
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