钢渣—金尾矿复合微晶玻璃的研制

发布时间：2018-04-16 12:00

  本文选题：钢渣 + 金尾矿　； 参考：《山东建筑大学》2017年硕士论文

【摘要】：随着社会和经济的发展,人们对钢铁和黄金的需求量日益增大,随之而来的钢渣和金尾矿的排放量与日俱增,为社会发展带来了严重负担。本论文创新性的以钢渣和金尾矿为主料,辅以合适比例的添加剂,寻求最佳工艺方法制备出性能良好的钢渣-金尾矿复合微晶玻璃,有广阔的应用前景。根据钢渣和金尾矿的特性,并通过前期实验探索,本文将钢渣和金尾矿总用量控制在90%,选取钢渣含量分别占总量的85%、80%、75%、70%、65%、60%六组配方进行实验。利用DTA热分析仪确定了钢渣-金尾矿微晶玻璃的热处理制度,对基础玻璃和热处理后的微晶玻璃进行XRD分析,并用扫描电子显微镜观察了样品表面形貌。同时对钢渣-金尾矿复合微晶玻璃的抗折强度、密度、耐腐蚀性进行了测定,最终得出制备钢渣-金尾矿复合微晶玻璃的最佳配方和热处理制度。钢渣-金尾矿复合微晶玻璃的物相种类不随原料配比变化,六组配方均以普通辉石为主晶相,以透辉石为次晶相。其衍射峰强度随金尾矿掺量的增加而增强。并且随着金尾矿掺量增加,微晶玻璃样品的晶粒尺寸越来越小且趋于均匀,尺寸在0.1~1μm之间。微晶玻璃样品的抗折强度和密度随金尾矿掺量的增加先增大后减小,耐酸性随金尾矿掺量增加越来越好,耐碱性则相反。当钢渣含量为70%,金尾矿掺量为20%获得的微晶玻璃性能最佳,其抗折强度达到171.7 MPa,密度达到2.8g/cm3,并有较好的化学稳定性。在钢渣/金尾矿比例实验的基础上,对最佳比例的4#(钢渣70%,金尾矿20%)样品进行了最佳热处理制度的实验研究,分析了热处理制度的变化对微晶玻璃物相、表面形貌和性能的影响。实验结果表明:微晶玻璃的物相种类不随热处理制度的变化而变化,均是以普通辉石为主晶相,以透辉石为次晶相,衍射峰强度随热处理温度的升高和热处理时间的延长而增强。热处理温度升高和热处理时间延长会使样品中晶粒长大并趋于均匀致密,但温度过高和时间过长会导致样品中出现微裂纹,当热处理温度870℃热处理120min时,样品表面晶粒均匀致密。4#微晶玻璃样品的抗折强度和耐酸碱腐蚀性随热处理温度增加和热处理时间延长先增大后减小,样品整体耐酸性要好于耐碱性,密度随温度增加和时间延长逐渐增大并最后趋于一致。最终确定其最佳热处理温度870℃,热处理时间120min,此时抗折强度达到171.7MPa,密度2.8 g/cm3,经酸溶液腐蚀后的质量损失率为0.18%,经碱溶液腐蚀后的质量损失率为0.22%。
[Abstract]:With the development of society and economy, the demand for steel and gold is increasing day by day, and the discharge of steel slag and gold tailings is increasing, which brings a serious burden to the social development.In this paper, steel slag and gold tailings are used as main materials and the appropriate proportion of additives are used to find the best process to prepare the steel slag-gold tailing composite glass-ceramics with good performance, which has a broad application prospect.According to the characteristics of steel slag and gold tailings, and through the previous experiment, the total amount of steel slag and gold tailings is controlled at 90%, and the 85% steel slag content is selected for the experiment.The heat treatment process of the glass-ceramics of steel slag and gold tailings was determined by DTA thermal analyzer. The basic glass and the glass-ceramics after heat treatment were analyzed by XRD, and the surface morphology of the samples was observed by scanning electron microscope (SEM).At the same time, the flexural strength, density and corrosion resistance of steel slag-gold tailing composite glass-ceramics were determined. Finally, the optimum formula and heat treatment system of preparing steel slag-gold tailing composite glass-ceramics were obtained.The phase types of steel slag-gold tailing composite glass-ceramics do not change with the ratio of raw materials. The six formulations are composed of ordinary pyroxene as main crystal phase and diopside as secondary crystal phase.The diffraction peak intensity increases with the increase of the amount of gold tailings.With the increase of gold tailing content, the grain size of glass-ceramics becomes smaller and more uniform, and the size is between 0.1 渭 m and 0.1 渭 m.The flexural strength and density of glass-ceramics samples first increase and then decrease with the increase of the amount of gold tailings, the acid resistance increases with the increase of gold tailing content, and the alkali resistance is opposite.When the steel slag content is 70 and the gold tailings content is 20%, the glass-ceramics with a flexural strength of 171.7 MPA, a density of 2.8 g / cm ~ 3 and a good chemical stability are obtained.On the basis of the experiment of steel slag / gold tailings ratio, the optimum heat treatment system of 4#steel slag / gold tailings sample was studied, and the effect of heat treatment system on glass-ceramics phase was analyzed.Effects of surface morphology and properties.The experimental results show that the types of phases of glass-ceramics do not change with the change of heat treatment system. They are mainly composed of ordinary pyroxene and diopside as secondary phase.The intensity of diffraction peak increases with the increase of heat treatment temperature and heat treatment time.The increase of heat treatment temperature and the prolongation of heat treatment time will result in the grain growth and uniform densification in the sample, but if the temperature is too high and the time is too long, there will be microcracks in the sample. When the heat treatment temperature is 870 鈩，

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