Recovery of zinc from low-grade zinc oxide ores by solvent extraction

来源期刊：中南大学学报(英文版)2003年第2期

论文作者：覃文庆 蓝卓越 黎维中

文章页码：98 - 102

Key words：zinc; low-grade zinc oxide ores; heap leaching; solvent extraction

Abstract: The recovery of zinc from low-grade zinc oxide ores with solvent extraction-electrowinning technique was investigated by using D2EHPA as extractant and 260^#kerosene as diluent. The results show that it is possible to selectively leach zinc from the ores by heap leaching. The zinc concentration of leach solution in the first leaching cycle is 32.57 g/L, and in the sixteenth cycle the zinc concentration is 8.27g/L after solvent extraction. The leaching solution is subjected tosolvent extraction, scrubbing and selective stripping for enrichment of zinc and removal of impurities. The pregnant zinc sulfate solution produced from the stripping cycle is suitable for zinc electrowinning. Extra-pure zinc metal was obtained in the electrowinning test under conventional conditions.