从赤泥硫酸熟化浸出液中预富集钪

Scandium Pre-enrichment from Red Mud Sulfuric Acid Curing Leaching Solution

采用正交试验研究硫酸赤泥熟化浸出液中钪的萃取性能,并通过二次反萃制备出钪富集物。结果表明,当P204浓度10%、相比O/A=1/15、萃取时间5min时,钪萃取率高达99.27%。当反萃剂为2.5mol/L NaOH溶液、反萃相比O/A=1/1.5、反萃时间10min、反应温度95℃至水相微微沸腾、反萃次数2次时,钪反萃率为98.34%,获得的初步富集物中钪含量为0.86%,可用于进一步制作高纯氧化钪产品。

Orthogonal test was applied to investigate extraction performance of scandium in red mud curing leaching solution.Scandium enrichment was prepared by secondary stripping.The results show that scandium extraction rate is 99.27% under the optimum conditions including P204 concentration of 10%,O/A=1/15 and extraction time of 5 min.Stripping rate of Sc with 2.5 mol/L NaOH as stripping agent is98.34% under the conditions including O/A=1/1.5,stripping time of 10 min,reaction temperature from95℃to slight boiling of water phase,and stripping frequency of twice.The obtained initial enrichment with Sc content of 0.86%can be used to produce high-purity scandium oxide products.