钟丽江, 蒋绍松, 叶群, 金次, 邵敏, 黄章杰. Aliquat-336萃取碱性氰化液中的Pt(Ⅱ)[J]. 云南大学学报(自然科学版), 2019, 41(6): 1201-1207. doi: 10.7540/j.ynu.20190278
引用本文: 钟丽江, 蒋绍松, 叶群, 金次, 邵敏, 黄章杰. Aliquat-336萃取碱性氰化液中的Pt(Ⅱ)[J]. 云南大学学报(自然科学版), 2019, 41(6): 1201-1207. doi: 10.7540/j.ynu.20190278
ZHONG Li-jiang, JIANG Shao-shong, YE Qun, JIN Ci, SHAO Min, HUANG Zhang-jie. Extraction of Pt(Ⅱ) from alkaline cyanide solution using Aliquat-336[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(6): 1201-1207. DOI: 10.7540/j.ynu.20190278
Citation: ZHONG Li-jiang, JIANG Shao-shong, YE Qun, JIN Ci, SHAO Min, HUANG Zhang-jie. Extraction of Pt(Ⅱ) from alkaline cyanide solution using Aliquat-336[J]. Journal of Yunnan University: Natural Sciences Edition, 2019, 41(6): 1201-1207. DOI: 10.7540/j.ynu.20190278

Aliquat-336萃取碱性氰化液中的Pt(Ⅱ)

Extraction of Pt(Ⅱ) from alkaline cyanide solution using Aliquat-336

  • 摘要: 研究了一种采用Aliquat-336为萃取剂,从碱性氰化液介质中分离回收Pt(CN)42−的新方法. 对改性剂用量、金属离子浓度、溶液pH、平衡时间、相比和Aliquat-336浓度对萃取的影响进行了详细考察. 在最佳条件下,几乎所有的Pt (CN)42−,Fe (CN)63−,Co(CN)63− (> 99.0%)能同时被Aliquat-336萃取. 采用两步反萃法回收Pt(CN)42−,首先,用0.7 mol·L−1 KCl溶液对负载在Aliquat-336中的Fe(CN)63−和Co(CN)63−进行反萃,Fe(CN)63−和Co(CN)63−的反萃率均超过95.0%,而Pt(CN)42−的反萃率低于5.0%;第二步,采用2.0 mol·L−1 KI溶液可反萃94.0%以上负载在Aliquat-336中的Pt(CN)42−. 该有机相至少可进行4次萃取-反萃循环,经4次循环Pt(CN)42−的回收率大于92.0%. 根据红外光谱、紫外光谱、核磁共振氢谱、连续变换法和卡尔-费休滴定法,推断萃取反应为离子交换机理.

     

    Abstract: A new method of separation and recovery of Pt(CN)42− from alkaline cyanide solution media was investigated using Aliquat-336 as extractant. The effects of modifier content, the metal ions concentration, solution pH, equilibrium time, phase ratio, and the Aliquat-336 concentration were investigated in details. Almost all Pt(CN)42−, Fe(CN)63−, and Co(CN)63− (>99.0%) could be simultaneously extracted by Aliquat-336 under optimum conditions. Furthermore, Pt(CN)42− was recovered by the two-step stripping process. First, Fe(CN)63− and Co(CN)63− in the loaded Aliquat-336 were stripped by a 0.7 mol·L−1 KCl solution. The stripping percentages for both Fe(CN)63− and Co(CN)63− were above 95.0 %, whereas the stripped Pt(CN)42− was below 5.0%. Second, more than 94.0% Pt(CN)42− in the loaded Aliquat-336 could be stripped using 2.0 mol·L−1 KI solution. The organic phase could be reused for at least 4 cycles of extraction-stripping processes. The recovery ratio for Pt(CN)42− was above 92.0% after four testing cycles. According to the infrared spectrum, ultraviolet spectrum, 1H NMR, continuous transformation method, and Karl Fischer titration method, the extraction reactions were deduced to be ion exchange mechanisms.

     

/

返回文章
返回