叔碳酸Versatic 10对稀土的萃取——Ⅰ.Versatic10在有机溶剂中聚合度的研究

本文应用气相渗透法测定Versatic10在正己烷、环己烷、苯和乙醇中的数均分子量,并通过表观数均分子量和分子式分子量之比,计算得到Versatic 10在上述四种溶剂的聚合度分别为:2、1、1和1(当〔Versatic10〕=0.03M),及2、2、2和1(当〔Versatic10〕=0.4—0.5M).

叔碳酸Versatic 10对稀土的萃取——Ⅱ.斜率法研究 Versatic10对钇和铒的萃取反应

在萃取剂(HA)浓度为0.1—0.8M,Ln^(3+)浓度为0.001—0.02M 范围内,测定了Ln^(3+)的分配比,并根据lgD 与pH、〔HA〕、及〔Ln^(3+)〕关系,应用Fletcher 的数据处理方法,求得萃合物组成为LnA_3·4HA,气相色谱法测定钇萃合物的水化数为1;提出了表示Versatic10萃取钇的化学平衡的方程式:

Versatic10萃取分离微生物浸出液中钙镁和低含量镍钴

以Versatic10为萃取剂从含镍、钴、钙、镁离子的合成硫酸盐溶液中萃取分离镍、钴离子。在25℃、振荡强度200r/min、振荡时间4 min的条件下,Versatic10萃取镍、钴离子的最佳条件为:初始pH2.5、相比O/A=1/3、皂化率60%。用去离子水(pH=6.50)对负载有机相按相比O/A=1/1洗涤2次,钙、镁离子的共萃率均可降至0.5%以下。用2mol/L硫酸按相比O/A=1/1反萃时,镍、钴的反萃率均在99%以上。

LIX63和Versatic10萃取体系中镍钴锰的协萃机制研究

采用斜率法研究了Versatic10(HA1)、LIX63(HA2)及二者协同萃取体系对Ni2+、Co2+、Mn2+的萃取机制,考察了LIX63和Versatic10协同萃取Ni2+、Co2+、Mn2+时分配比随温度的变化,并计算相关热力学参数。结果表明:LIX63与Versatic10的物质的量比在1/4~4/1范围内,该协萃体系对Ni2+、Co2+有明显的协萃效应,其中对Ni2+的协萃效果更好,对Mn2+基本没有协萃效应;Versatic10萃取Co2+、Ni2+、Mn2+时形成的萃合物可能为Co(A1)2、Ni(A1)2、Mn(A1)2;LIX63萃取Ni2+、Co2+、Mn2+形成的萃合物可能为[Ni(A2)2]、[Co(HA2)SO4]和[Mn(HA2)SO4];LIX63和Versatic10协同萃取Ni2+、Co2+、Mn2+时形成的萃合物可能为Ni(A1)2(HA2)2、Co(A1)2(HA2)2、Mn(A1)2(HA2)2;协同萃取Ni2+时吸热,协同萃取Co2+、Mn2+时放热;协同萃取Ni2+的反应过程中增熵,协同萃取Co2+、Mn2+的反应熵小于零,表明萃取过程中水相金属离子脱水过程引起的熵变大于形成萃合物过程中所引起的熵变。

溶剂萃取法制备电池级高纯硫酸锰

以Versatic10为萃取剂从含钙、镁、钾、钠的模拟硫酸锰浸出液中选择性萃取锰。在萃取剂浓度30%、皂化率50%、相比O/A=4/1、35℃两级逆流萃取10min后,得到平均锰含量为13.5g/L的负载有机相,锰萃取率达85.34%。负载有机相和2mol/L硫酸反萃液在相比O/A=8/1、反萃温度35℃、两级逆流反萃的条件下,得到平均锰含量为107.89g/L的反萃后液,锰反萃率达99.94%,其中钙、镁、钾、钠的浓度均小于15mg/L。反萃后液经活性炭吸附、浓缩结晶并干燥后,获得了满足电池级高纯硫酸锰要求的一水硫酸锰产品。

Recovery of cobalt and nickel in the presence of magnesium and calcium from sulfate solutions by Versatic 10 and mixtures of Versatic 10 and Cyanex 301

The extraction and stripping characteristics of Versatic 10 and its mixtures with Cyanex 301 were investigated for the recovery of cobalt and nickel from sulfate solutions containing magnesium and calcium. The optimum extraction factors of Versatic 10 were initial pH of 2.5, O/A ratio of 1/3, and saponification rate of 60%. The loaded Versatic 10 was stripped by using 2 mol/L H2SO4 at O/A ratio of 1/1. The optimum volume ratio of Versatic 10 to Cyanex301 was 7/3 in the mixtures, which could effectively reduce the equilibrium pH to 3.50. And the loaded mixtures were stripped by using 2 mol/L H2SO4at O/A ratio of 1/2. The reaction principle of Versatic10 and metal ions is an ion exchange reaction. However, in the extraction reaction of and metal ions, besides the ion exchange reaction, the strong coordination effect between Cyanex 301 and metal ions also exists, which is much weakened in the extraction reaction of the mixtures and metal ions.