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yi shui ying lv shi xing lv tu kuang zai koh ya rong yan jie zhi zhong de rong chu xing wei
Pages: 391-396
Year: Issue:  3
Journal: The Chinese Journal of Process Engineering

Keyword:  diaspore bauxitesub-molten saltKOHleachingAl2O3K2O;
Abstract: 采用KOH亚熔盐介质溶出中低品位一水硬铝石型铝土矿,考察了反应温度、碱矿比、初始KOH溶液浓度、反应时间及添加CaO对溶出后赤泥化学成分和物相的影响.结果表明,在反应温度220℃、碱矿质量比1.5、初始KOH溶液浓度50%(ω)、反应时间1h的条件下,Al2O3回收率可达81.4%,赤泥的铝硅质量比降至1.06,赤泥中硅主要以KAlSiO4形式存在.溶出过程中添加CaO不能提高Al2O3溶出率.进一步回收溶出后赤泥中的K2O和Al2O3,终赤泥中K2O含量降至0.61%,Al2O3含量降至8.09%,Al2O3总回收率可达90.7%.
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