National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , PR China.
Key Laboratory of Green Process and Engineering , Institute of Process Engineering, Chinese Academy of Sciences , Beijing 100190 , PR China.
Environ Sci Technol. 2019 Aug 6;53(15):9102-9108. doi: 10.1021/acs.est.9b02369. Epub 2019 Jul 25.
A complexation extraction system was designed to develop a new process for the efficient removal of fluoride from solutions, such as zinc or copper electrolytes or wastewater derived from flue gas. The effects of the boron fluoride molar ratio, organic phase composition, initial pH, temperature, and phase volume ratio on the extraction efficiency were investigated. The extraction efficiency was found to increase with the increase in the boron fluoride molar ratio, Alamine336 concentration, and phase volume ratio, whereas it decreased with the increase in temperature. For the simulated electrolyte or wastewater derived from flue gas, the majority of metallic ions were insensitive to the extraction, with the exception of Al and Fe. Fluoride decreased from 5 g/L to 0.05 g/L after two-stage cross-flow extraction alone; with an extraction efficiency of 99%. Both the stripping and cycling properties were excellent when sodium hydroxide was employed as the stripping reagent. Furthermore, the loading capacity was 43.4 g/L, and increased by four times, when boric acid was added. This novel process implies a wide range of potential applications, such as the removal of unwanted fluoride ions from various high-fluoride polluted solutions and the simplification of brine phase diagram.
设计了一种络合萃取体系，以开发一种从溶液中高效去除氟化物的新工艺，如锌或铜电解液或来自烟道气的废水。研究了硼酸氟摩尔比、有机相组成、初始 pH 值、温度和相比对萃取效率的影响。萃取效率随着硼酸氟摩尔比、Alamine336 浓度和相比的增加而增加，而随着温度的升高而降低。对于模拟电解液或来自烟道气的废水，除 Al 和 Fe 外，大多数金属离子对萃取不敏感。经过两级错流萃取，氟化物从 5g/L 降至 0.05g/L，萃取效率达到 99%。当使用氢氧化钠作为反萃试剂时，反萃和循环性能都非常优异。此外，当添加硼酸时，负载容量增加到 43.4g/L，增加了四倍。这种新工艺具有广泛的潜在应用，例如从各种高氟污染溶液中去除不需要的氟离子，以及简化盐水相图。
