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Continuous bio-hydrometallurgical extraction of zinc from a bulk lead-zinc flotation concentrate on a pilot scale
Minerals Engineering ( IF 4.8 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.mineng.2020.106529
Mosayeb Ahmadi , Mohammad Raouf Hosseini , Ali Ahmadi , Abdolrahim Foroutan

Abstract The high interlock between the fine particles of sphalerite and galena in some parts of the Goushfil mine (Isfahan, Iran) ore has significantly reduced the flotation efficiency. According to the acceptable capability of bioleaching in the recovery of metals from the complex mineralogical resources, the feasibility of zinc extraction from a low-grade (34% Zn) bulk flotation concentrate was investigated. The applied concentrate was processed using a large-scale continuous bioleaching system, including three 50 l stirred bioreactors in series. After 15 days, 83% of zinc was recovered by implementing a mixed culture of moderately thermophile bacteria at pH = 1.8 and 15% solid content. In the next stage, 83% of the accompanying iron impurity was removed from the leachate by jarosite precipitation. Then, about 99.9% of zinc was gained by solvent extraction using 25% saponified D2EHPA at pH = 3.5, O/A = 1 at two steps. Consequently, bioleaching, in combination with bulk flotation, can be successfully applied to recover zinc from the complex lead-zinc ore of the examined deposit.

中文翻译:

以中试规模从散装铅锌浮选精矿中连续生物湿法冶金提取锌

摘要 伊朗伊斯法罕 Goushfil 矿部分地区的闪锌矿和方铅矿细颗粒之间的高度互锁,显着降低了浮选效率。根据生物浸出从复杂矿物资源中回收金属的可接受能力,研究了从低品位(34% Zn)散装浮选精矿中提取锌的可行性。应用的浓缩物使用大型连续生物浸出系统进行处理,包括三个串联的 50 升搅拌生物反应器。15 天后,通过在 pH = 1.8 和 15% 固体含量下实施中等嗜热细菌的混合培养,回收了 83% 的锌。在下一阶段,83% 的伴随铁杂质从渗滤液中通过黄钾铁矾沉淀去除。然后,大约99。使用 25% 皂化 D2EHPA 在 pH = 3.5、O/A = 1 分两步通过溶剂萃取获得 9% 的锌。因此,生物浸出与散装浮选相结合,可以成功地用于从所检查矿床的复杂铅锌矿中回收锌。
更新日期:2020-09-01
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