(東北大學 材料與冶金學院，沈陽 110004)
摘 要: 使用分析純試劑配料，在1 500 ℃、保溫1 h的條件下得到了四元化合物20CaO∙13Al2O3∙3MgO∙3SiO2 (C20A13M3S3)，研究了其氧化鋁浸出性能，并通過XRD和SEM等分析了其在碳酸鈉溶液中的作用機理。結(jié)果表明：C20A13M3S3具有一定的氧化鋁浸出能力，其浸出率隨著浸出時間的延長而提高，并在浸出2 h后達到最大值68.87%，低于同條件下12CaO∙7Al2O3的氧化鋁浸出率(92.78%)；C20A13M3S3和Na2CO3反應的主要產(chǎn)物為NaAl(OH)4和CaCO3，并含有少量的Ca2SiO4和Mg(OH)2；生成的Ca2SiO4具有較高的活性，浸出2 h后，其分解率可達到19.35%。
關(guān)鍵字: 鋁酸鈣爐渣；MgO；C20A13M3S3；氧化鋁；浸出
（School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract: 20CaO∙13Al2O3∙3MgO∙3SiO2 (C20A13M3S3) was obtained at 1 500 ℃ for 1h with analysis pure reagents proportioning. Alumina leaching property of C20A13M3S3 was studied. And the mechanism of the reaction between C20A13M3S3 and Na2CO3 solution was discussed by XRD and SEM method. The results indicate that alumina can be leached from C20A13M3S3. The leaching rate rises gradually with the prolongation of leaching time and reaches its maximum 68.87% after leaching for 2 h. The maximum leaching rate of C20A13M3S3 is lower than that of C12A7, which is 92.78% under the same condition. The main products of C20A13M3S3 reaction with Na2CO3 are NaAl(OH)4 and CaCO3, and a few amount of Ca2SiO4 and Mg(OH)2 are also generated. Ca2SiO4 generated from the reaction has high activity, and the decomposition rate can achieve 19.35% after leaching for 2 h.
Key words: calcium aluminate slag; MgO; C20A13M3S3; alumina; leaching
