Shangguan Yunfei, Li Baoqing, Zhuang Xinguo, Querol Xavier, Moreno Natalia, Huang Pengcheng, Guo Yajie, Shi Yutao, Wu Tianchi, Sola Patricia Córdoba
Huibei Key Laboratory of Marine Geological Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China; Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China.
Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China.
J Hazard Mater. 2025 Jan 15;482:136537. doi: 10.1016/j.jhazmat.2024.136537. Epub 2024 Nov 20.
This study investigates arsenic (As) species, sources, and transformation patterns in deposited coal mine dust (DCMD) from three coal mines-QSY, MHJ, and SCC-in the Ningdong Coalfield, China. While the parent coals have low As levels, the DCMD shows significant enrichment, with concentrations 137 to 345 times higher. The mineral composition of the DCMD reflects that of the parent coals but includes secondary minerals such as gypsum and various trace elements, including As. This enrichment results from multiple factors: polluted waters used for dust control in the working front (WF), gangue dust introduced during mining operations, wear from mining machinery affecting Fe levels, and precipitation of As-salts from alkaline mine drainage. In the parent coals, As(V) comprises 60-65 % of the As, while As(III) accounts for 14-35 %. In contrast, the DCMD samples reveal As(V) as the dominant species (22-58 %), with As(III) making up 18-44 %. Arsenic leachability is influenced by Fe content, enhancing As adsorption and limiting mobility in QSY mine, while mixed As complexes in MHJ and SCC under alkaline conditions affect As mobility. The presence of more toxic As(III) in DCMD highlights environmental and health risks, emphasizing the need to avoid high-As polluted waters for dust control.
本研究调查了中国宁东煤田QSY、MHJ和SCC这三个煤矿的沉积煤矿粉尘（DCMD）中的砷（As）物种、来源及转化模式。虽然原煤中的砷含量较低，但DCMD显示出显著富集，其浓度高出137至345倍。DCMD的矿物组成反映了原煤的矿物组成，但包括石膏等次生矿物以及包括砷在内的各种微量元素。这种富集是由多种因素造成的：工作面前方（WF）用于降尘的受污染水、采矿作业过程中引入的煤矸石粉尘、采矿机械磨损影响铁含量以及碱性矿井排水中砷盐的沉淀。在原煤中，五价砷（As(V)）占砷总量的60 - 65%，而三价砷（As(III)）占14 - 35%。相比之下，DCMD样品显示五价砷是主要物种（22 - 58%），三价砷占18 - 44%。砷的浸出性受铁含量影响，在QSY矿中增强了砷的吸附并限制了其迁移性，而在MHJ和SCC矿的碱性条件下，混合砷络合物影响了砷的迁移性。DCMD中存在毒性更强的三价砷突出了环境和健康风险，强调了避免使用高砷污染水进行降尘的必要性。
