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Characteristics and the origins of the main chemical components in mine water in the Xishan mining area, North China
Analyzing the characteristics of the chemical composition of coal mine water and discussing its formation process can provide baseline information for the prevention and control of water hazards. In this study, 152 mine water samples from 8 coal mines in the Xishan mining area (XSMA) were sampled, a...
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Published in: | Environmental earth sciences 2022-04, Vol.81 (8), Article 240 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Analyzing the characteristics of the chemical composition of coal mine water and discussing its formation process can provide baseline information for the prevention and control of water hazards. In this study, 152 mine water samples from 8 coal mines in the Xishan mining area (XSMA) were sampled, and their chemical characteristics and formation mechanism were analyzed comprehensively using standard hydrochemical and statistical methods. The results show that the main cations in the mine water are Na
+
and Ca
2+
, and the dominant anions are SO
4
2−
and HCO
3
−
. The mine water of Xiqu coal mine showed the highest concentrations of Ca
2+
, Mg
2+
, and SO
4
2−
ions, and the Guandi coal mine showed the highest Na
+
content, but both mines showed relatively low Cl
−
concentration. Ca
2+
and Mg
2+
were significantly positively correlated with SO
4
2−
, while pH was significantly negatively correlated with Ca
2+
and SO
4
2−
. The 152 samples were divided into 6 categories (G1–G6) through cluster analysis. Specifically, the hydrochemical type of G1 is HCO
3
–Na, G2 and G3 are mainly SO
4
·Cl–Na, G4 is mainly HCO
3
–Ca·Mg, G5 is mainly SO
4
·Cl–Ca·Mg type, and G6 is mainly SO
4
· Cl–Ca ·Mg and SO
4
· Cl–Na. Through principal component analysis, three principal components were obtained, representing the oxidation of pyrite and the dissolution of carbonate and sulfate minerals, the weathering and alternating cation adsorption of silicate rocks, and the effects of rock salt dissolution and evaporative concentration. The ion proportion coefficient and principal component analysis showed that the mine water from the XSMA is mainly affected by rock (silicate and carbonate rock) weathering, mineral (gypsum) dissolution, cation exchange, and pyrite oxidation. The results are of great significance to the identification of mine water-inrush sources and the prevention and control of water disasters in the XSMA. |
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ISSN: | 1866-6280 1866-6299 |
DOI: | 10.1007/s12665-022-10363-3 |