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采用HBL101從鋅置換渣高酸浸出液中萃取鍺

Germanium extraction from a high acid leaching solution of zinc replacing slag by HBL101

  • 摘要: 針對現行的濕法煉鋅渣中提取鍺的研究現狀,采用新型萃取劑HBL101從鋅置換渣的高酸浸出液中直接萃取鍺,考察了料液酸度、萃取劑體積分數、萃取溫度、萃取時間和相比對萃取的影響以及氫氧化鈉質量濃度、反萃溫度、反萃時間和反萃相比對反萃的影響,并對萃取劑轉型條件進行了研究.實驗表明:有機相組成為30%HBL101+70%磺化煤油(體積分數)作為萃取劑,料液酸度為113.2 g·L-1H2SO4,其最佳萃取條件為萃取溫度25℃,萃取時間20 min,相比O/A=1∶4.經過五級逆流萃取,鍺萃取率達到98.57%.負載有機相用150 g·L-1NaOH溶液可選擇性反萃鍺得到高純度鍺酸鈉溶液,其最佳反萃條件為反萃溫度25℃,反萃時間25 min,相比O/A=4∶1.經過五級逆流反萃,反萃率可達到98.1%.反萃鍺后負載有機相再用200 g·L-1硫酸溶液反萃共萃的銅并轉型,控制反萃溫度25℃,反萃時間20 min,O/A=2∶1.經過五級逆流反萃,銅反萃率可達到99.5%并完成轉型,萃取劑返回使用.

     

    Abstract: 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 H2SO4 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 H2SO4 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.

     

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