| Lin Yunhong (蔺云宏)* **,Wu Gaoyang****,Lin Yongmei****,Li Yunju*****,Chen Zhong***.[J].高技术通讯(英文),2026,32(2):193~201 |
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| Study on the characteristics of heavy metal pollution and the effect of pH on their leaching from a lead-zinc tailings in Yunnan |
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| DOI：10. 3772 / j. issn. 1006-6748. 2026. 02. 008 |
| 中文关键词: |
| 英文关键词: lead-zinc tailings, heavy metal lead-zinc-cadmium, leaching toxicity, hydrogen ion concentration |
| 基金项目: |
| Author Name | Affiliation | | Lin Yunhong (蔺云宏)* ** | (* School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China)
(** Guangzhou Metro Design and Research Institute Co. , Ltd. , Guangzhou 510410, P. R. China)
(*** Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, P. R. China )
(**** College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, P. R. China )
(***** National Engineering Research Center of Phosphate Resources Development and Utilization,Yunnan Phosphating Group Co. , Ltd. , Kunming 650600, P. R. China) | | Wu Gaoyang**** | | | Lin Yongmei**** | | | Li Yunju***** | | | Chen Zhong*** | |
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| 中文摘要: |
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| 英文摘要: |
| Heavy metals represent the most critical pollution risk in metal mine tailings. Characterizing their contamination and understanding their natural leaching behavior are thus crucial for effective risk management. This study is centered on the tailings of a lead-zinc tailings pond in Yunnan Province,with the objective of performing a heavy metal risk assessment. Results showed that cadmium (Cd) and arsenic(As) exceeded regulatory limits, zinc ( Zn) was present at very high concentrations,while other metals remained within standards. Leaching tests revealed significant differences between the sulfuric-acid-nitric-acid method ( SPLP) and the toxicity characteristic leaching procedure (TCLP). No metals exceeded limits under SPLP, whereas lead ( Pb) and Cd exceeded TCLP thresholds, albeit at low risk levels. Therefore, the TCLP results provide a more reliable and objective risk assessment. As hydrogen ion concentration (pH) is a key environmental driver, leaching of Pb, Zn, and Cd was examined across pH 1. 0 - 14. 0. Cd leaching declined sharply then gradually with increasing pH. In contrast, Pb and Zn exhibited a three stage pattern: rapid decline at low pH, sustained low levels at intermediate ( pH 3. 0 - 11. 0) , and a sharp increase under strong alkalinity ( pH 12. 0 - 12. 5) . |
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