(中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083)
摘 要: 以再生鋁行業(yè)二次鋁灰為主要原料，開展二次鋁灰燒結(jié)制備鈣鋁黃長(zhǎng)石/鎂鋁尖晶石復(fù)相材料的研究。熱力學(xué)計(jì)算表明，二次鋁灰添加氧化鈣和氧化鎂，理論上可以制備出鈣鋁黃長(zhǎng)石/鎂鋁尖晶石復(fù)相材料。結(jié)果表明，當(dāng)二次鋁灰、氧化鈣和氧化鎂質(zhì)量分?jǐn)?shù)依次為70.80%、18.58%和10.62%，在1100~1500 ℃范圍內(nèi)，均能制備出鈣鋁黃長(zhǎng)石/鎂鋁尖晶石復(fù)相材料；隨燒結(jié)溫度升高，鈣鋁黃長(zhǎng)石/鎂鋁尖晶石復(fù)相材料純度和結(jié)晶度明顯提高，抗壓強(qiáng)度呈升高趨勢(shì)，顯氣孔率呈下降趨勢(shì)。當(dāng)燒結(jié)溫度為1500 ℃時(shí)，所制備出鈣鋁黃長(zhǎng)石/鎂鋁尖晶石復(fù)相材料顯氣孔率和抗壓強(qiáng)度分別為33.87%和40.18 MPa。
關(guān)鍵字: 二次鋁灰；燒結(jié)；鈣鋁黃長(zhǎng)石/鎂鋁尖晶石；復(fù)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
