从钛白废酸中萃取回收钛  

Recovery of Titanium by Solvent Extraction from Waste Sulfuric Acid Discharged in Titanium Dioxide Production

作　　者：马雪阳 梁斌[1] 吕莉[1] 刘维燥 李春[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《钢铁钒钛》2016年第4期62-68,共7页Iron Steel Vanadium Titanium

摘　　要：对伯胺N1923+仲辛醇萃取回收钛白废酸中的钛进行研究,着重考察搅拌速度、仲辛醇浓度、相比、反应温度、反应时间等因素对从钛白废酸中萃取分离钛铁及萃取分相的影响,探索氨水对钛反萃效果。结果表明,以20%N1923+4%仲辛醇+76%磺化煤油为有机相,在相比O/A=1∶1,搅拌速度150 r/min,反应温度30℃,时间3 min的条件下,钛的单级萃取率大于96%,共萃的铁约为4%。仲辛醇的加入可以显著降低分相时间,分相时间从23 min降至4 min。氨水可以有效反萃钛,钛的单级反萃率达到96%;钛的反萃速度快,平衡时间仅为3 min。在氮气保护下进行萃取,可以避免铁的氧化,共萃的铁可降至0.5%以下。将上述结果应用于工业钛白废酸,得到了进一步证实。因此,采用N1923-仲辛醇-煤油萃取体系从工业钛白废酸中选择性地、高效回收钛的路线是可行的。The recovery of titanium by solvent extraction from spent sulfuric acid discharged in titanium di- oxide production, using primary amine N1923 and 2-octanol as agents was investigated. The effects of vari- ous process factors including stirring rate, 2-octanol concentration, O/A phase ratio, extraction temperature and time on the phase disengagement and separation of titanium and iron were emphatically studied, and the influence of ammonia on stripping of titanium was also researched. The results show that using 20 （v/ v）% N1923 as extractant, 4 （v/v） % 2-octanol as modifier and 76 （v/v） % sulfonated kerosene as dilu- ent, the single stage extraction rate of titanium is above 96% with about 4% iron co-extracted at O/A = 1 ： 1, stirring rate 150 r/min, extraction temperature 30 ℃ and contact time 3 min. The phase disengage- ment time can be significantly decreased from 23 min to 4 min by addition of 2-octanol. Titanium can be ef- fectively stripped by ammonia and 96% of single stage stripping rate for titanium is obtained with only 3 min for equilibrium. The oxidation of iron can be avoided by extraction under N2 atmosphere with less than 0.5% iron co-extracted. The processes mentioned above was applied to industrial waste sulfuric acid dis- charged in titanium dioxide production, confirming the feasibility of selective and efficient recovery of tita- nium from industrial spent sulfuric acid by N1923-2-octanol-kerosene extraction system.

关 键 词：钛白废酸 萃取 钛 N1923 仲辛醇 氨水 

分 类 号：TF823[冶金工程—有色金属冶金]