添加剂对一水硬铝石型铝土矿焙烧强化溶出的影响

研究了在一水硬铝石型铝土矿焙烧过程中添加剂对焙烧矿溶出性能的影响。实验结果表明, 在一水硬铝石型铝土矿焙烧过程中添加氟化铝, 对焙烧矿的溶出性能有明显的改善作用。在铝土矿中添加1%的氟化铝焙烧, 经185 ℃溶出1 h 后, 焙烧矿氧化铝的溶出率达52%, 比未添加时提高15%左右;且随着氟化铝添加量的增加, 氧化铝的溶出率随之升高, 当添加量为5%时, 在同样溶出条件下氧化铝溶出率可达71%;而铝土矿添加3%氟化铝焙烧, 在200 ℃溶出1 h, 氧化铝溶出率即可达到88%。

Effect of Additives on Digestibility of Roasted Diasporic Bauxite during Roasting

The effect of additives on the digestibility of diasporic bauxite during its roasting is studied.The results show that addition of AlF3 during roasting of diasporic bauxite can improve dramatically the extraction rate of aluminium.The extraction rate of aluminium in the roasted bauxite ore come up to 52 % by adding 1 %AlF₃ the bauxite, followed by roasting and digesting it at 185 ℃for 1 hour.The extraction rate of aluminium obtained with AlF₃ is higher 15 % than the one without AlF₃, and increasing AlF₃ the extraction rate of aluminium increases.When the content of AlF3 added is up to 5 %, the extraction rate of aluminium comes up to 71 %;when 3 %AlF₃ is added to the bauxite, the extraction rate of aluminium will reach 88 % by roasting and digesting at 200 ℃ for 1 hour.