Abstract
Zinc extraction from crude zinc oxide (CZO) is beneficial to the full utilization of secondary resources and environmental protection. In this paper, a systematic investigation was carried out to study the leaching behavior of CZO by using ammonia-ammonium carbonate solution. It was found that the maximum leaching rate of zinc from CZO dust was 95.7% under the conditions of [Zn]T: [NH3]T: [CO32−] =1: 7.00: 1.75, liquid to solid ratio 5: 1, leaching temperature 30 °C and leaching time 60 min. Compared with pure zinc oxide (PZO) leaching, the CZO leaching required longer time and more leaching agents, which is caused by the Cd2+, Pb2+ and other metal cationic impurities in CZO. The metal cationic impurities dissolved in the leaching solution and combined with ammonium to form complexes, consuming leaching agents and affecting zinc leaching.
摘要
从次氧化锌烟尘中回收锌有利于二次资源充分利用和环境保护. 本文采用氨水-碳酸氢铵溶液作为浸取剂从次氧化锌烟尘浸取锌, 系统研究了该体系中锌的浸出行为. 研究结果表明: 在[Zn]T:[NH3]T:[CO32−]T=1:9.6:2.4、 液固比5:1、 浸出温度30 °C、 浸出时间60 min 的条件下, 锌的浸出率最大, 为95.7%. 而对照样纯氧化锌在[Zn]T:[NH3]T:[CO32−]T=1:7.00:1.75, 浸出时间为20 min 时, 锌的浸出率达99.9%. 次氧化锌烟尘浸出需更长的时间和更多的浸出剂, 其主要原因是烟尘中Cd2+、 Pb2+等金属阳离子杂质溶解于溶液中, 与铵结合形成配合物, 消耗了浸出剂, 影响了锌的浸出.
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Project(2020YFC1909805) supported by the National Key Research and Development Program of China; Projects (51504293, 51574284) supported by the National Natural Science Foundation of China; Project (2018-GX-A7) supported by Qinghai Provincial Major Scientific and Technological Special Project of China; Project (2020SK2125) supported by the Key Research and Development Program of Hunan Province, China; Project(CSUZC202129) supported by Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University, China
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ZHONG Qiang and YANG Yong-bin provided the concept and edited the draft of manuscript. JIANG Tao and MENG Fei-yu wrote the first draft of the manuscript. GAO Wei, ZENG Yan and SU Huan-huan conducted the literature review and analyzed the measured data. XU Bin and LI Qian edited the draft of manuscript. All authors replied to reviewers’ comments and revised the final version.
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Jiang, T., Meng, Fy., Gao, W. et al. Leaching behavior of zinc from crude zinc oxide dust in ammonia leaching. J. Cent. South Univ. 28, 2711–2723 (2021). https://doi.org/10.1007/s11771-021-4803-x
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DOI: https://doi.org/10.1007/s11771-021-4803-x