P507萃取锆和铪及分离性能

稀有金属, 2008, 32(3): 355-359. doi: 10.3969/j.issn.0258-7076.2008.03.019

P507萃取锆和铪及分离性能

徐欣 ^1, , 杨新伟 ^2, , 邬元旭 ^3, , 钟月明 ^4, , 李永绣 ^5,

1.南昌大学稀土与微纳米功能材料研究中心,江西,南昌,330031

2.南昌大学稀土与微纳米功能材料研究中心,江西,南昌,330031

3.江西全南晶环科技有限公司,江西,全南,341700

4.江西全南晶环科技有限公司,江西,全南,341700

5.南昌大学稀土与微纳米功能材料研究中心,江西,南昌,330031

关键词： P507 , 盐酸 , 溶剂萃取 , 锆 , 铪

Extraction and Separation Properties of Zirconium (Ⅳ) and Hafnium(Ⅳ) Using P507

以氯氧化锆(铪)溶液为料液, 用2-乙基己基膦酸单2-乙基己基酯(P507)萃取剂在盐酸介质中萃取锆铪.研究了P507浓度、料液浓度、萃取温度和时间、盐酸或氯离子浓度、添加剂浓度等因素对锆铪萃取率、分配比和分离系数的影响.结果表明: P507萃取锆铪的反应为吸热反应; 萃取速率较慢, 平衡时间≥40 min, 改变金属离子和萃取剂浓度, 以及在有机相中添加仲辛醇等均难以使萃取速率得到有效提高; 饱和法测得有机相中萃取剂与金属离子的物质的量之比为3左右; 锆、铪的分配比随着P507浓度的增加而增加, 但增加的幅度在低浓度区域和高浓度区域各不相同.锆铪之间的分离系数在萃取剂浓度0.9 mol·L-1附近呈极小值; 盐酸和氯离子浓度的影响较复杂, 呈波浪式变化.

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