二次铝灰烧结制备镁铝尖晶石材料  

Sintering fabrication of magnesia-alumina spinel by secondary aluminum dross

作　　者：张勇 何小娟 喻成龙 鲁美娟[1] 罗运阔[1] 方汉孙[1] 黄华军 郭新春 ZHANG Yong;HE Xiaojuan;YU Chenglong;LU Meijuan;LUO Yunkuo;FANG Hansun;HUANG Huajun;GUO Xinchun(School of Land Resources and Environment,Jiangxi Agricultural University,Nanchang 330045,China)

机构地区：[1]江西农业大学国土资源与环境学院,南昌330045

出　　处：《有色金属科学与工程》2021年第6期42-49,共8页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(52004113)。

摘　　要：以再生铝行业二次铝灰为主要原料,开展二次铝灰烧结制备镁铝尖晶石(MA)材料的研究。热力学分析表明,二次铝灰添加MgO,理论上可以制备出MA材料。研究结果表明,当二次铝灰和氧化镁质量分数比为1∶0.2,在1100~1500℃范围内,均能制备出MA材料;随烧结温度升高,MA材料纯度和结晶度明显提高,抗压强度呈升高趋势,显气孔率呈下降趋势。当烧结温度为1400℃时,所制备出MA材料显气孔率和体积密度分别为9.65%和2.02 g/cm^(3),线变化率和抗压强度分别为38%和89.8 MPa,材料抗压强度达到国家行业标准《镁砖和镁铝砖》(GB/T 2275-2007)(40 MPa),即抗压强度≥40 MPa标准。上述结果表明,在二次铝灰中添加适量氧化镁,可以将二次铝灰烧结制备成镁铝尖晶石材料,实现资源化利用。Magnesia-alumina(MA)spinel by sintering secondary alumina ash from the secondary aluminum dross was studied.Thermodynamic analysis showed that MA material can be prepared theoretically by adding MgO to secondary aluminum ash.The results showed that MA spinel could be obtained under the sintering temperature from 1100 to 1500℃when the mass ratio of aluminum dross to MgO was 1∶0.2,respectively.The purity and crystallinity of MA spinel improved significantly.In addition,the compressive strength increased,while apparent porosity decreased with the increasing of sintering temperature.When the sintering temperature was 1400℃,the apparent porosity and density of the prepared MA spinel were 9.65%and 2.02 g/cm^(3).The linear expansivity and the compressive strength were 38%and 89.8 MPa.The compressive strength of MA spinel reached the national standard of People’s Republic of China for Magnesium brick and magnesium-aluminum brick(GB/T 2275-2007)(40 MPa),that is,the compressive strength was more than 40 MPa.The results showed that the MA spinel could be synthesis using the secondary aluminum dross with MgO.Therefore this technique provided the possibility of reutilization of the secondary aluminum dross in an environmentally friendly way.

关 键 词：二次铝灰 烧结 镁铝尖晶石 性能 

分 类 号：TF09[冶金工程—冶金物理化学]