赤泥中碱的分布特征与淋滤效果研究

赤泥中含有钠、钾等杂质，在堆存过程中不仅会造成环境污染，还会制约赤泥在水泥等建筑材料领域中的综合利用。利用电子探针、原位剥蚀等离子体质谱等微观分析手段分析研究了赤泥中钠、钾的分布特征。同时考察了不同pH的淋滤液对赤泥中钠、钾的淋滤效果。结果表明，pH为2、4、8这3种体系中，前10次取样共滤出拜耳法赤泥的钠分别大于17.6%、16.8%、19.6%；烧结法赤泥钠的滤出量分别为36.7%、53.1%、54.1%。pH为2、4、8的3种体系中，前10次取样共滤出拜耳法赤泥的钾分别为10.5%、10.1%、11.4%；烧结法赤泥钾的滤出量分别为40.0%、56.8%、57.5%。

Distribution features and leaching effect of alkali in red mud

Alkali in red mud is harmful to water，land and air of the surrounding areas because of the rainfall when red mud is stored on land.Meanwhile，alkali restricts red mud′s comprehensive utilization in building materials such as cement.The distribution of alkali，including Na and K，in red mud was studied by electron probe microanalysis and in situ ICP-MS.The effects of leaching liquids with different pH on Na and K in red mud were also investigated.According to the leaching experiment，more than 17.6%，16.8%，and 19.6% of Na and 10.5%，10.1%，and 11.4% of K can be leached from the Bayer red mud，while 36.7%，53.1%，and 54.1% of Na and 40.0%， 56.8%，and 57.5% of K can be leached from the red mud from the sintering process，using the leaching solutions with pH of 2，4，and 8，respectively