(中南大学 冶金与环境学院，长沙 410083)
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钙铝黄长石/镁铝尖晶石复相材料的研究。热力学计算表明，二次铝灰添加氧化钙和氧化镁，理论上可以制备出钙铝黄长石/镁铝尖晶石复相材料。结果表明，当二次铝灰、氧化钙和氧化镁质量分数依次为70.80%、18.58%和10.62%，在1100~1500 ℃范围内，均能制备出钙铝黄长石/镁铝尖晶石复相材料；随烧结温度升高，钙铝黄长石/镁铝尖晶石复相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1500 ℃时，所制备出钙铝黄长石/镁铝尖晶石复相材料显气孔率和抗压强度分别为33.87%和40.18 MPa。
关键字: 二次铝灰；烧结；钙铝黄长石/镁铝尖晶石；复相材料
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:Gehlenite/magnesia-alumina spinel composites from the secondary aluminum dross were studied using sintering. Thermodynamic calculation shows that the secondary aluminum dross adding MgO and CaO can prepare the gehlenite/magnesia-alumina spinel composites in theory. The results show that gehlenite/magnesia-alumina spinel composites can be obtained under the sintering temperature from 1100 ℃ to 1500 ℃ when the mass ratio of aluminum dross, CaO and MgO is 70.80%, 18.58% and 10.62%, respectively. The purity and crystallinity of gehlenite/magnesia- alumina spinel composites are improved significantly, and the compressive strength is also increased, while the apparent porosity decreases with increasing of the sintering temperature. When the sintering temperature is 1500 ℃, the apparent porosity of gehlenite/magnesia-alumina spinel composites is 33.87% and the compressive strength is 40.17 MPa.
Key words: secondary aluminum dross; sintering; gehlenite/magnesia-alumina spinel; composite material
