Extraction of Lithium from Salt Lake Brine using N523-TBP Mixture System

In this work, problems encountered by tri-butyl phosphate (TBP) in the industrialization of lithium extraction from salt lake brine were discussed in detail. The lithium extraction behavior of N, N-bi-(2-ethylhexyl) acetamide (N523) was investigated, and its defect was analyzed in the view of practical application. The N523-TBP mixture extraction system was proposed to alleviate or avoid the defects that N523 and TBP met when they were used severally. The composition of this mixture extraction system was determined as 20%N523-30%TBP-50% kerosene. The effects of brine acidity, Fe/Li molarity ratio, phase ratio and chloride ion concentration on lithium extraction efficiency were discussed respectively. The operation conditions in single stage extraction were optimized as brine acidity=0.05 mol/L, Fe/Li molarity ratio=1.3 and phase ratio=2. The high concentration of chloride ion in brine was benefit for extraction of lithium. The structure of extracted complex was proposed as (LiFeCl4·nN523·mTBP)·(2-n)N523·(2-m)TBP (m+n=2) by chemical analysis and slope fitting methods. The extraction thermodynamic functions were calculated preliminarily, and the results suggested that the extraction process was an exothermic (ΔH<0) and spontaneous (ΔG<0) reaction, and the degree of disorder increased (ΔS>0) during the extraction process. This work will give some guidance to the lithium industry of Qinghai in both fundamental theory and practical application.     

P507萃取色层分离ICP—AES法测定高纯氧化镱中14种稀土杂质元素

本文采用Ｐ５０７萃取树脂－盐酸体系色谱法对高纯氧化镱中１４种稀土杂质元素进行分离、富集,用ＩＣＰ－ＡＥＳ法测定其稀土元素含量。当上柱量为２００ｍｇＹｂ２Ｏ３时,所能达到的测定下限：Ｅｕ２Ｏ３为１μｇｇ－１;Ｙ２Ｏ３,Ｇｄ２Ｏ３,Ｄｙ２Ｏ３,Ｈｏ２Ｏ３,Ｔｍ２Ｏ３,Ｌｕ２Ｏ３为２μｇｇ－１;Ｌａ２Ｏ３,Ｅｒ２Ｏ３为４μｇｇ－１;Ｐｒ６Ｏ１１,Ｎｄ２Ｏ３,Ｓｍ２Ｏ３,Ｔｂ４Ｏ７为８μｇｇ－１;ＣｅＯ２为１６μｇｇ－１。５次取样分离,加入试验回收率在８８％—１１２％之间,相对标准偏差＜１０％。本方法可适用于纯度为９９．９５％—９９．９９％的氧化镱中１４种稀土杂质元素的测定。     

大孔树脂纯化菠萝皮黄酮类化合物的研究

通过静态吸附与解吸实验,比较7种树脂对菠萝皮黄酮类化合物的吸附和解吸特性,筛选出较优的菠萝皮黄酮类化合物吸附剂,并检测吸附流速、上样液浓度、pH值、洗脱流速、洗脱剂体积分数等动态吸附性能。结果表明:AB-8树脂具有较好的吸附和解吸效果,吸附流速1mL/min、上样液浓度2.25mg/mL、pH值6、洗脱流速0.5mL/min、洗脱剂体积分数90%条件下,AB-8型大孔树脂可用于菠萝皮黄酮类化合物的分离纯化。     

410哌啶树脂在分离富集中的应用研究 Ⅱ.岩矿中痕量金银铊镓铟的分离富集

研究了在HCl(或HBr)介质中410哌啶树脂对Au~(3+)、Ag~+、Tl~(3+)、Ga~(3+)和In~(3+)的吸附特性,考察了被吸附金属离子的分组洗脱或分别顺序洗脱条件,拟定了地质样品中上述诸离子的分离富集程序。经地质标样分析验证,方法可行。     

离子交换技术在火山热液铀钼类型矿石堆浸生产中的应用

本文以上马架子火山热液铀钼类型矿石堆浸采铀开发为例，对离子交换技术回收浸出液中铀的工艺原理、条件和应用进行论述，对两种淋洗剂进行简要的论述和比较，并简要介绍了树脂钼中毒的机理及处理方法，对开发该类型矿床（点）具有一定的参考意义。     

南极乔治王岛菲尔德斯半岛土壤的化学风化作用

西南极南设得兰群岛乔治王岛菲尔德斯半岛土壤化学分析表明土壤中存在着一定的化学风化作用。相对于母质,土壤中的SiO_2、Al_2O_3、Fe_2O_3、FeO、MgO,GaO和Na_2O淋失,K_2O、H_2O~+、H_2O~-、TiO_2和P_2O_5富集。土壤中SiO_2/Al_2O_3的平均值为4.71,属弱风化壳类型。硅铝比反映出成土作用时间越长,土壤的风化程度越高,化学风化作用大于南极大陆边缘和内部。Al_2O_3在南极的淋失率大于SiO_2,使较老土壤剖面由下向上硅铝比增大。土壤的化学性质很大程度上取决于母质。南极强烈的冻融扰动作用破坏了土壤分层。土壤中存在着较强的水合作用。     

离子交换树脂催化合成丙烯酸正丁酯

论述了以丙烯酸、正丁醇为原料,离子交换树脂作催化剂,催化合成丙烯酸正丁酯的新工艺。考察了催化剂种类、用量、原料配比、反应时间、阻聚剂用量以及催化剂使用次数等因素对酯化率的影响,确定了催化剂种类和最佳工艺条件。结果表明,７３１强酸性离子交换树脂具有良好的催化活性和选择性,可多次重复使用,酯化率可达８２．０％,产品质量符合国家标准,该工艺操作简单,条件容易控制,对环境无污染。     

P507萃淋树脂吸附稀土的性能研究和应用

采用静动态两种方法较系统地研究了Ｐ５０７萃淋权脂吸附稀土的性能,并选择了分离稀土总量的最佳条件。用于标准矿样中稀土总量的测定,分析结果与标准值相近。