(中南大学 冶金科学与工程学院，长沙 410083)
摘 要:
关键字: 高铁一水硬铝石；烧结；低钙比；有效溶出率
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The sintering process of diasporic bauxite with high iron content was studied. The results show that 3CaO•2SiO2, and 2CaO•SiO2, are primarily formed in the sintering process when diasporic bauxite is sintered at soda ratio Na2O/(Al2O3+Fe2O3) of 1 and lime ratio CaO/SiO2 of 1.5. The increase of n(CaO)/n(SiO2) decreases the extraction of alumina and silica. The prolongation of sintering time and the increase of sintering temperature benefit the alumina extraction but reduce the silica extraction. The increase of the ratio of iron to alumina decreases the sintering temperature and narrows the sintering temperature range. The results from the Al2O3 available extraction rate also indicate that the high alumina extraction rate can be obtained at n(CaO)/n(SiO2) of 1.5. The feasible technology for sintering is as follows: sintering temperature 1 250−1 300 ℃, sintering time 20−40 min, n(CaO)/n(SiO2) of 1.5.
Key words: diaspore with high iron; sinter; low molar ratio of CaO to SiO2; available extraction rate
