用铁尾矿和镁尾矿制备M_2S隔热砖的工艺研究
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摘要
尾矿综合利用开发高附加值产品的研究是目前国内外普遍关注的课题。本课题结合辽宁省铁尾矿和镁尾矿的物理化学性质,进行了高硅鞍山型铁尾矿和浮选镁尾矿生产镁橄榄石(M_2S)隔热耐火材料工艺技术的研究。
在研究中,通过相图和热力学等的知识以及多次实验验证,最终确定了镁橄榄石质隔热耐火材料合成实验的可行性和原料的最佳配比。使用XRD、SEM等实验检测方法对铁尾矿和镁尾矿为原料合成镁橄榄石的生成过程、微观结构、相组成进行了研究分析,确定合成反应机理以及合理的烧结制度。实验结果如下:
(1)通过理论分析和多次实验最终确定原料最佳配比为m_(铁尾矿)∶m_(镁尾矿)∶m_(轻烧镁粉)=3∶5∶2,烧成温度为1450℃。
(2)实验采用添加物燃尽法制备镁橄榄石隔热耐火砖,用聚苯乙烯小珠球作为添加物可以有效调节砖的气孔率。
(3)用硅微粉和轻烧镁粉作粘结剂可以使制品具有良好的干坯强度和使用强度。
(4)利用制得的镁橄榄石隔热砖经破碎后还可以制备镁橄榄石质不定形耐火材料。
(5)XRD和SEM结果表明,制品的主要成分为镁橄榄石和少量方镁石。
(6)常温抗折抗压、重烧线变化、耐火度和负荷软化实验结果表明:制品能够达到国家标准并且可以取代一些传统的轻质耐火材料,如高铝砖和黏土砖等。
The research of the comprehensive utilization of tailings to develop the high added value products is the subject of widespread attention at home and abroad.In this paper,it was studied the technology of forsterite(M_2S) insulating refractory with high-silicon iron ore tailings from Anshan and flotation magnesium ore tailings.
So in this paper,according to the theory analysis of phase diagram and thermal dynamic,it was analyzed the feasibility of experiment of the synthesized process of forsterite insulating refractory and the best ratio of mixture.It was studied the synthesized process,microstructure and phase composition of forsterite with iron ore railings and magnesium ore tailings by SEM and XRD,and then determined the synthesis reaction mechanism and reasonable sintering schedule.The results are as follows:
(1)Through the theoretical analysis and numerous experiments,the best ratio of mixture is M _(iron ore tailings):M_(magnesium ore tailings):M_(active magnesia)=3:5:2, sintering temperature:1450℃.
(2)It is used the burn-off method of superadditions to prepare forsterite insulating firebrick,and using polystyrene bead as superadditions can regulate the porosity of bricks effectively.
(3)The product,which is added microsilica and active magnesia as binder,has better dry body strength and intensity.
(4)After being broken up,the forsterite insulating firebrick can be prepared for amorphous refractory.
(5)Through the analysis of SEM and XRD,the main components of the product are forsterite and a few periclasite.
(6)After the testing of normal temperature creasing resistance and compression,linear change on reheating,refractoriness and refractoriness under load,the results show that the products can reach the national standard and replace some traditional lightweight refractory materials such as high-alumina brick,clay brick and so on.
在研究中,通过相图和热力学等的知识以及多次实验验证,最终确定了镁橄榄石质隔热耐火材料合成实验的可行性和原料的最佳配比。使用XRD、SEM等实验检测方法对铁尾矿和镁尾矿为原料合成镁橄榄石的生成过程、微观结构、相组成进行了研究分析,确定合成反应机理以及合理的烧结制度。实验结果如下:
(1)通过理论分析和多次实验最终确定原料最佳配比为m_(铁尾矿)∶m_(镁尾矿)∶m_(轻烧镁粉)=3∶5∶2,烧成温度为1450℃。
(2)实验采用添加物燃尽法制备镁橄榄石隔热耐火砖,用聚苯乙烯小珠球作为添加物可以有效调节砖的气孔率。
(3)用硅微粉和轻烧镁粉作粘结剂可以使制品具有良好的干坯强度和使用强度。
(4)利用制得的镁橄榄石隔热砖经破碎后还可以制备镁橄榄石质不定形耐火材料。
(5)XRD和SEM结果表明,制品的主要成分为镁橄榄石和少量方镁石。
(6)常温抗折抗压、重烧线变化、耐火度和负荷软化实验结果表明:制品能够达到国家标准并且可以取代一些传统的轻质耐火材料,如高铝砖和黏土砖等。
The research of the comprehensive utilization of tailings to develop the high added value products is the subject of widespread attention at home and abroad.In this paper,it was studied the technology of forsterite(M_2S) insulating refractory with high-silicon iron ore tailings from Anshan and flotation magnesium ore tailings.
So in this paper,according to the theory analysis of phase diagram and thermal dynamic,it was analyzed the feasibility of experiment of the synthesized process of forsterite insulating refractory and the best ratio of mixture.It was studied the synthesized process,microstructure and phase composition of forsterite with iron ore railings and magnesium ore tailings by SEM and XRD,and then determined the synthesis reaction mechanism and reasonable sintering schedule.The results are as follows:
(1)Through the theoretical analysis and numerous experiments,the best ratio of mixture is M _(iron ore tailings):M_(magnesium ore tailings):M_(active magnesia)=3:5:2, sintering temperature:1450℃.
(2)It is used the burn-off method of superadditions to prepare forsterite insulating firebrick,and using polystyrene bead as superadditions can regulate the porosity of bricks effectively.
(3)The product,which is added microsilica and active magnesia as binder,has better dry body strength and intensity.
(4)After being broken up,the forsterite insulating firebrick can be prepared for amorphous refractory.
(5)Through the analysis of SEM and XRD,the main components of the product are forsterite and a few periclasite.
(6)After the testing of normal temperature creasing resistance and compression,linear change on reheating,refractoriness and refractoriness under load,the results show that the products can reach the national standard and replace some traditional lightweight refractory materials such as high-alumina brick,clay brick and so on.
引文
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