College of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan 411201, China.
Int J Environ Res Public Health. 2019 Jul 3;16(13):2355. doi: 10.3390/ijerph16132355.
This study reports on the assessment of the impact of antimony mine wastes from Xikuangshan (XKS) Antimony Mine in Lengshuijiang City, Hunan Province. We focus on the leaching of a number of potentially toxic elements (PTEs) from residues from the processing of antimony ore. The PTE content of ore processing waste and solutions generated by leaching experiments were determined for a suite of PTEs associated with the ore mineralization. These were Sb, As, Hg, Pb, Cd and Zn. As anticipated, high concentrations of the PTEs were identified in the waste materials, far exceeding the standard background values for soil in Hunan Province. For Sb and As, values reached >1800 mg·kg and >1200 mg·kg, respectively (>600 and >90 times higher than the soil background). The leaching of Sb, As, Hg, Pb, Cd and Zn decreased with an increase in grain size and leachable portions of metal ranged between 0.01% to 1.56% of total PTE content. Leaching tests identified the release of PTEs through three stages: a. alkaline mineral dissolution and H exchanging with base cation; b. oxidation and acid production from pyrite and other reducing minerals; and c. the adsorption and precipitation of PTEs.
本研究报告了对湖南省冷水江市锡矿山锑矿尾矿废物的影响评估。我们关注的是从锑矿石加工过程中产生的残渣中浸出多种潜在有毒元素（PTEs）。对与矿石矿化相关的一系列 PTEs 进行了矿石加工废物和浸出实验产生的溶液中 PTE 含量的测定。这些 PTE 是 Sb、As、Hg、Pb、Cd 和 Zn。正如预期的那样，废物材料中鉴定出高浓度的 PTE，远远超过湖南省土壤的标准背景值。对于 Sb 和 As，含量分别达到>1800 mg·kg 和>1200 mg·kg（>600 和>90 倍于土壤背景）。Sb、As、Hg、Pb、Cd 和 Zn 的浸出率随粒度的增加而降低，金属的可浸出部分在总 PTE 含量的 0.01%至 1.56%之间。浸出试验确定 PTE 通过三个阶段释放：a. 碱性矿物溶解和 H 与碱基阳离子交换；b. 黄铁矿和其他还原矿物的氧化和产酸；c. PTE 的吸附和沉淀。
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