Mining Engineering Department, Arak University of Technology, Arak, Iran.
Mining Engineering Department, Tarbiat Modares University, Tehran, Iran.
Sci Rep. 2021 Jan 15;11(1):1566. doi: 10.1038/s41598-021-81141-7.
An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals in the ore were hemimorphite, willemite, and calcophanite. Main gangue minerals were quartz, goethite, hematite, and calcite. Central composite design (CCD) method was used to design leaching experiments and the optimum conditions were found as follows: 30% of solid fraction, 22.05% sulphuric acid concentration, and the leaching temperature of 45 °C. The PLS containing 35.07 g/L zinc, 3.16 g/L iron, and 4.58 g/L manganese impurities was produced. A special purification process including Fe precipitation and Zn solvent extraction was implemented. The results showed that after precipitation of iron, Zn extraction of 88.5% was obtained with the 2 stages extraction system composed of 30 vol% D2EHPA as extractant. The overall Zn recovery from the ore was 71.44%. Therefore, an appropriate solution containing 16.6 g/L Zn, 0.05 g/L Fe, and 0.11 g/L Mn was prepared for the electro-winning unit without using the roasting and calcination steps (conventional method), which result in environmental pollution.
采用综合湿法冶金工艺从一种锌矿石中浸出和净化锌，该矿石含锌 9.75wt%。矿石中的锌矿物为纤锌矿、水锌矿和钙锌矿。主要脉石矿物为石英、针铁矿、赤铁矿和方解石。采用中心复合设计（CCD）方法设计浸出实验，得出最佳条件如下：固液比 30%、硫酸浓度 22.05%、浸出温度 45°C。得到含 35.07g/L 锌、3.16g/L 铁和 4.58g/L 锰杂质的 PLS。实施了特殊的净化工艺，包括铁沉淀和锌溶剂萃取。结果表明，铁沉淀后，采用由 30vol%D2EHPA 作为萃取剂组成的 2 级萃取系统，可获得 88.5%的 Zn 萃取率。矿石中 Zn 的总回收率为 71.44%。因此，在不使用焙烧和煅烧步骤（常规方法）的情况下，为电积单元制备了一种合适的溶液，其中含有 16.6g/L Zn、0.05g/L Fe 和 0.11g/L Mn，避免了环境污染。
