铝土矿浸出液中铝、铁的回收利用

以铝土矿浸出液为原料,通过化学沉淀法、碱溶、碳分、煅烧等工艺得到氧化铁、氧化铝粉体。本实验考察了沉淀、碱溶、碳分过程中溶液终点pH值、反应温度、反应时间等条件对反应率的影响,得到优化工艺条件。并采用化学成分分析、XRD、SEM对产品进行表征。结果表明：沉淀阶段,在最终pH值6.5,反应温度80°C,反应时间90 min条件下铝的沉淀率可达99%,铁的沉淀率达97%。碱溶阶段,在溶液终点pH值14,碱溶温度80°C,碱溶时间30 min的条件下,铝溶出率达到99.42%,铁去除率到99.63%。在碳分阶段,在溶液终点pH值9.0,碳分温度40°C,CO₂流速选择6 mL/min的条件下,铝沉淀率达到98.69%。得到的产品粉体晶型良好,颗粒均匀,符合国家标准。

Recovery of Aluminium and Iron from Leaching Solution of bauxite

The aluminium oxide and iron oxide powder were obtained through precipitation, alkali dissolution, carbonation, and calcination using the acidic leaching solution of bauxite as raw materials. The optimum technological conditions of precipitation, alkali dissolution, and carbonation were investigated. The optimum technological conditions of precipitation , which could guarantee the precipitation rate of Al and Femore than 99% was: keeping pH value 5.0, precipitation temperature as 50°C for 50 min. The dissolving rate of Al99.42% and removing rate of Fe 99.63% under the optimum technological conditions of alkali dissolution: a alkali dissolving temperature 80°C, a pH value 14 and a dissolving time 30 min. The optimum technological conditions of carbonation, which could guarantee the precipitation rate of Al 98.69% was: keeping pH value 9.0, carbonating temperature as 40°C and CO₂ flow rate 6 mL/min. The product were characterized by chemical component analysis, X-ray diffraction (XRD), and scanning election microscope (SEM). The crystal form of the product were fine, the particles were homogeneous, and chemical component was accorded with the national standard.