摘要
采用酸热法处理低品位铝土矿,经过盐酸浸取除铁、加氟化铵焙烧脱硅、氢氟酸超声强化脱硅和浓硫酸精化除钛等步骤制取高纯度氟化铝,优化工艺条件∶控制加入浓盐酸液固比为1∶1,酸浸温度为60℃,酸浸时间为30min;控制氟化铵加入量为反应比的1.4倍,焙烧温度为500℃,焙烧时间为2h;控制加入氢氟酸液固比为3∶1,强化温度为60℃,强化时间为1h;控制加入浓硫酸液固比为3∶1,精化温度为90℃,精化时间为40min。在此条件下,铝的利用率达到90%以上,制得的氟化铝产品的纯度达到97.2%,满足相关化工产品的标准。
The low grade bauxite was disposed by acid -heating method, through leaching by hydrochloric acid for deferrization, roasting ammonium fluor- ide mixture for desilieation, hydrofluoric acid ultrasonic enhancement and leaching by sulfuric acid for detitanization, we got high purity aluminum fluoride. The optimized conditions of reaction were as follows ： For hydrochloric acid leaching, the ratio of liquid to solid was 1 ： 1, the reaction lasted for about 30min and the temperature was 60℃; For roasting, the amount of ammonium fluoride was 1.4times than the reaction, roasting for about 2h and the tem-perature was 500℃ ; For ultrasonic enhancement, the ratio of liquid to solid was 3： 1, the reaction lasted for about 1h and the temperature was 60℃; For sulfuric acid leaching, the ratio of liquid to solid was 3： 1, the reaction lasted for about 40min and the temperature was 90℃. Under those conditions, the utilization of aluminum can be up to more than 90%, and the purity of AlF3 product reached 97.2% , reaching the standard requirements of related chemical products.
出处
《轻金属》
CSCD
北大核心
2016年第1期15-18,共4页
Light Metals
关键词
低品位铝土矿
除铁
脱硅
除钛
氟化铝
low grade bauxite
deferrization
desilieation
detitanization
aluminum, fluoride
