资料[分析化学(日)29,323(1980)]介绍了用硫酸铵熔融分解三氧化二铝的方法。在此基础上上,我们对硫酸铵用量,分解温度和分解时间三个条件进行了试验,确定了炉渣等高硅试样的可行的分解条件。从残渣的光谱分析可知,三氧化二铝分解完全,氧化钙、氧化镁大部分被分解而二氧化硅则留在残渣中。在选定的条件下,三氧化二铝的回收率可达99%以上。分析手续称取试样0.1～0.2克于预置研细之硫酸铵的瓷坩埚中,用细玻璃棒搅匀,上面再复盖一层硫酸铵,于马弗炉中按拟定的条件进行熔融分解。取出坩埚冷却,放入300毫升烧杯中,加40毫升4N硫酸,加热至微沸半小时,用热水洗净坩埚,过滤。滤液用250毫升锥形瓶承接,以热水洗涤烧杯及沉淀数次。残渣 The document [Analytical Chemistry (Japanese) 29, 323 (1980)] describes a method of melting and decomposing aluminum oxide with ammonium sulfate. On this basis, we tested the conditions of the amount of ammonium sulfate, the decomposition temperature and the decomposition time, and determined the feasible decomposition conditions of the high-silicon slag samples. Spectral analysis of the residue shows that the decomposition of aluminum oxide is complete, most of the calcium oxide and magnesium oxide are decomposed and the silicon dioxide remains in the residue. Under the selected conditions, the recovery of aluminum oxide up to 99%. Analysis procedures Weigh the sample 0.1 to 0.2 grams of pre-ground finely ground ammonium sulfate porcelain crucible, with a fine glass rod stir, covered with a layer of ammonium sulfate, muffle furnace in accordance with the conditions of the proposed melting break down. Remove the crucible cooling, into a 300 ml beaker, add 40 ml 4N sulfuric acid, heated to micro-boiling for half an hour, wash the crucible with hot water, filtered. The filtrate was taken in a 250 ml Erlenmeyer flask, the beaker was washed with hot water and pelleted several times. Residue