摘要
针对现行的湿法炼锌渣中提取锗的研究现状,采用新型萃取剂HBL101从锌置换渣的高酸浸出液中直接萃取锗,考察了料液酸度、萃取剂体积分数、萃取温度、萃取时间和相比对萃取的影响以及氢氧化钠质量浓度、反萃温度、反萃时间和反萃相比对反萃的影响,并对萃取剂转型条件进行了研究.实验表明:有机相组成为30%HBL101+70%磺化煤油(体积分数)作为萃取剂,料液酸度为113.2 g·L-1H2SO4,其最佳萃取条件为萃取温度25℃,萃取时间20 min,相比O/A=1∶4.经过五级逆流萃取,锗萃取率达到98.57%.负载有机相用150 g·L-1Na OH溶液可选择性反萃锗得到高纯度锗酸钠溶液,其最佳反萃条件为反萃温度25℃,反萃时间25 min,相比O/A=4∶1.经过五级逆流反萃,反萃率可达到98.1%.反萃锗后负载有机相再用200 g·L-1硫酸溶液反萃共萃的铜并转型,控制反萃温度25℃,反萃时间20 min,O/A=2∶1.经过五级逆流反萃,铜反萃率可达到99.5%并完成转型,萃取剂返回使用.
Germanium extraction from a high acid leach solution of zinc replacing slag by a new extractant, HBL101, was tested based on the current research status on extracting germanium from zinc smelting slag in hydrometallurgy. Investigations were performed on the effects of feed acidity, extractant concentration, extraction time, extraction phase ratio and temperature on the extraction, the effects of NaOH concentration, stripping time, stripping phase ratio and temperature on the stripping of germanium, and the conditions of extractant transformation. The results show that with 30% HBL101 in 70% sulphonated kerosene （ volume fraction） as an extract-ant, the extraction rate of germanium from the solution with 113. 2 g·L-1 H2 SO4 reaches 98. 57% in five-stage counter current extrac-tion with a volume ratio of oil phase to aqueous phase, O/A ratio, of 1：4 at 25℃ for 20 min. Germanium in the loaded organic can be selectively stripped using a 150 g·L-1 NaOH solution and the stripping rate reaches 98. 1% in five-stage counter current stripping with an O/A ratio of 4：1 at 25℃ for 25 min. After germanium stripping, copper in the loaded organic can be stripped using a 200 g·L-1 H2 SO4 solution and the stripping rate of copper reaches 99. 75% in five-stage counter current stripping with an O/A ratio of 2：1 at 25℃ for 20 min. The extractant returns to extraction circularly.
出处
《工程科学学报》
EI
CAS
CSCD
北大核心
2015年第1期35-41,共7页
Chinese Journal of Engineering
基金
国家自然科学基金资助项目(51374238)
关键词
湿法冶金
锗
萃取
反萃
转型
hydrometallurgy
germanium
extraction
stripping
transformation
