石灰对高铁铝土矿溶出赤泥铝硅比及钠硅比的影响  

Influence of lime on digestion of high iron bauxite

作　　者：杨巧芳[1] 尹中林[1] 齐利娟[1] 韩东战[1] 李晓萍[1] 

机构地区：[1]中国铝业股份有限公司郑州研究院,河南郑州450041

出　　处：《轻金属》2013年第11期27-29,共3页Light Metals

摘　　要：本文以广西某地高铁一水硬铝石与三水铝石混合矿为研究对象,研究了石灰对该矿溶出赤泥铝硅比及钠硅比的影响。试验结果表明,当石灰添加量小于8%时,溶出赤泥铝硅比随着石灰添加量的增加而降低;当石灰添加量大于8%时,随石灰添加量的增加,赤泥的铝硅比基本保持不变,这与常规氧化铁含量低的一水硬铝石型铝土矿溶出赤泥的铝硅比随石灰添加量的增加呈先下降后上升的规律不一致,物相结果表明造成上述差异的主要原因在于:随着石灰添加量增加至8%后,由于该矿中氧化铁、氧化钛含量很高,脱硅矿物水化石榴石中的铝、硅被铁、钛同质替代,致使溶出赤泥的铝硅比基本保持不变;而溶出赤泥钠硅比则由于不断增加的石灰中氧化钙替代了钠硅渣中的氧化钠从而使在试验范围内溶出赤泥的钠硅比随石灰添加量的增加而不断降低。In this paper influence of lime on the ratio of alumina to silica-（A/S） and the ratio of sodium oxide to silica （N/S） in red mud digested from the high iron bauxite which the diaspore and gibbsite in Guangxi province are mixed. The results show that the A/S in red mud initially decreases with lime addition increasing when the amount of lime addition is less than 8% ; while the ratio remains almost unchangeable as the additive amount is more than 8%, and the N/S falls whenever lime addition rises. The reason A/S in red mud almost keeps constant is that aluminum is substituted by ferrum or titani- um, while silicon by titanium due to high content of ferrum and titanium in the bauxite.

关 键 词：石灰 溶出 铝针铁矿 水化石榴石 碱耗 

分 类 号：TF821[冶金工程—有色金属冶金]