摘要
研究烧结法处理我国高铁中等品位矿石的工艺条件,确定钙比为1.5时熟料中存在3CaO·2SiO2和2CaO·2SiO2。结果表明,增大钙比使熟料Al2O3溶出率、SiO2溶出率均有所降低;延长烧成时间,提高烧成温度有利于Al2O3溶出率的增加和SiO2溶出率的降低;提高铁铝比,熟料最佳烧成温度降低,烧成温度范围变窄;提出的Al2O3有效溶出率概念表明,钙比为1.5时,熟料烧成效果最好;确定高铁铝土矿适宜的烧成制度为：烧成温度1250～1300℃,烧成时间20～40min,钙比1.5。
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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第10期1903-1908,共6页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展规划资助项目(2005CB623702)
关键词
高铁一水硬铝石
烧结
低钙比
有效溶出率
diaspore with high iron
sinter
low molar ratio of CaO to SiO2
available extraction rate
