scholarly journals The geochemical (alkaline earth) characteristics of groundwater in the Taiyuan Formation limestone aquifer in Huaibei coalfield

2018 ◽  
Vol 14 (1) ◽  
pp. 217-228
Author(s):  
Song Chen ◽  
Herong Gui
Keyword(s):  
Alkaline Earth ◽  
Major Ions ◽  
Alkaline Earth Metals ◽  
Limestone Aquifer ◽  
Ph Values ◽  
Taiyuan Formation ◽  
Alkaline Earth Elements ◽  
Groundwater Samples ◽  
Huaibei Coalfield ◽  
Mining Districts

Abstract To understand the characteristics and distribution of alkaline earth elements in groundwater in the Taiyuan Formation limestone aquifer in Huaibei coalfield, 29 groundwater samples were collected, and the concentrations of major ions and alkaline earth metals (beryllium, barium and strontium) determined. The results show that the groundwater is alkaline, with the sample pH values between 7.40 and 10.10. The total dissolved solids (TDS) concentration in the samples was between 123 and 5,520 mg/l. The concentration ranges of Be, Ba and Sr are 0.0001 to 0.03 μg/l, 2.43 to 215.21 μg/l, and 13.08 to 18,168.5 μg/l, respectively. The major ions are mainly controlled by carbonate dissolution, with some ion exchange. The Be content is influenced mainly by pH, while the Sr has the same source as Ca and Mg. A concentration contour diagram for groundwater TDS and Sr can be used to identify groundwater runoff conditions. The Zhahe and Suixiao coal-mining districts are the main groundwater recharge areas, and Linhuan district the discharge area. The Sr/Mg and Sr/Ca ratios are highest where the groundwater residence time in the aquifer is longest. The two highest Sr/Ca ratios are 340.1 and 116.6, and occur in the Haizi and Yuanyi coalmines, respectively, suggesting that groundwater residence times are long in them.

scholarly journals The age, distribution, and geochemical characteristics of groundwater in the Ordovician limestone aquifer in the Huaibei coalfield, China

2017 ◽  
Vol 12 (2) ◽  
pp. 354-362
Author(s):  
Song Chen ◽  
Herong Gui
Keyword(s):  
Major Ions ◽  
Groundwater Age ◽  
Age Distribution ◽  
Mean Values ◽  
Limestone Aquifer ◽  
Ordovician Limestone ◽  
Groundwater Samples ◽  
Huaibei Coalfield ◽  
Mining Districts ◽  
Δd And Δ18o

In this study, we collected 22 groundwater samples and supporting measurements from different coal-mining districts in the Huaibei coalfield to examine the age, hydro-chemical characteristics, and evolution of groundwater in the Ordovician limestone aquifer (OA). We determined the groundwater concentrations of major ions, stable isotopes (hydrogen and oxygen) and a radio isotope (14C). All the samples were alkaline in nature, and had pH values between 7.10 and 10.80. The total dissolved solids (TDS) contents varied from 119 to 2,443 mg/l. The concentrations of δD and δ18O in groundwater varied from −64.32‰ to −42.76‰, and from −8.62‰ to −5.40‰, with mean values of −56.38‰ and −7.62‰, respectively. The groundwater at OA is recharged by rainfall or surface water, and, because of either the long residence time or runoff into the aquifer, is influenced by water-rock interactions. The age of the groundwater in the OA ranged from 2,660a to 10,040a, and the groundwaters were youngest and oldest in the Renlou and Yangzhuang coal mines, respectively. Contour diagrams of TDS in groundwater, the groundwater age, and the spatial distribution of the water types indicated that the Renlou and Yangzhuang mines were the recharge and discharge areas, respectively.

scholarly journals The Influence of Karst Aquifer Mineralogy and Geochemistry on Groundwater Characteristics: West Bank, Palestine

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1829 ◽  
Author(s):  
Hassan Jebreen ◽  
Andre Banning ◽  
Stefan Wohnlich ◽  
Andrea Niedermayr ◽  
Marwan Ghanem ◽  
...  
Keyword(s):  
Trace Elements ◽  
Alkaline Earth ◽  
West Bank ◽  
Karst Aquifer ◽  
Hierarchical Cluster ◽  
Geochemical Data ◽  
Rock Samples ◽  
Study Approach ◽  
Alkaline Earth Elements ◽  
Groundwater Samples

This work reports, for the first time, the mineralogical and geochemical characteristics of karst aquifers in the Central West Bank (CWB) catchment in Palestine. It provides an integrated study approach by correlating the geochemistry of the lithology and hydrochemical data of groundwater samples. Mineralogical analysis showed that all of the samples were dominantly composed of either calcite CaCO3 (5–100 wt. %) or dolomite CaMg(CO3)2 (4–100 wt. %), with minor amounts of quartz and feldspar, which is supported by the inorganic carbon content (9–13 wt. %) and hydrochemical composition of the spring water samples. The whole-rock geochemical data indicated that the samples have low contents of trace elements and transition metals. In contrast, the concentrations of alkaline earth elements (Mg, Ca, Sr, Ba) and Mn were high in the rock and groundwater samples. Generally, the trace elements of rock samples with concentrations >10 ppm included Sr (17–330 ppm), Mn (17–367 ppm), Ba (2–32 ppm), W (5–37 ppm), Cr (3–23 ppm), Zn (1.7–28 ppm), V (4–23 ppm), and Zr (1–22 ppm), while the concentrations of all the other trace elements was below 10 ppm. Ionic ratios and hierarchical cluster analysis (HCA) suggested that the chemical evolution of groundwater was mainly related to the geogenic (rock–water) interaction in the study area. This is clear in the alkaline earth elements (Mg, Ca, Sr, Ba) ratios, especially regarding the Sr values. The calcite rock samples had higher Sr (mean 160 ppm, n = 11) than those of the dolomite rocks (mean 76 ppm, n = 9).

scholarly journals Hydrochemical characteristics and water quality evaluation of shallow groundwater in Suxian mining area, Huaibei coalfield, China

2020 ◽  
Vol 7 (4) ◽  
pp. 825-835
Author(s):  
Hao Yu ◽  
Herong Gui ◽  
Honghai Zhao ◽  
Meichen Wang ◽  
Jun Li ◽  
...  
Keyword(s):  
Water Quality ◽  
Major Ions ◽  
Shallow Groundwater ◽  
Mining Area ◽  
Water Quality Evaluation ◽  
Groundwater Samples ◽  
Silicate Dissolution ◽  
Huaibei Coalfield ◽  
Main Factor

AbstractThe aim of this study is to evaluate the hydrogeochemical characteristics and water environmental quality of shallow groundwater in the Suxian mining area of Huaibei coalfield, China. The natural formation process of shallow groundwater in Suxian is explored using Piper trilinear charts and Gibbs diagrams, and by examining the ratios between the major ions. United States Salinity Laboratory (USSL) charts, Wilcox diagrams, and the water quality index (WQI) are further employed to quantify the differences in water quality. The results reveal that the main hydrochemical facies of groundwater are HCO3–Ca, and that silicate dissolution is the main factor controlling the ion content in shallow groundwater. The USSL charts and Wilcox diagrams show that most of the water samples would be acceptable for use in irrigation systems. The WQI results for each water sample are compared and analyzed, and the quality of groundwater samples around collapse ponds is found to be relatively poor.

Heavy metals in coal mine groundwater responding to mining activity: concentration, temporal variation and speciation

2015 ◽  
Vol 10 (2) ◽  
pp. 390-401 ◽  
Author(s):  
He-rong Gui ◽  
Man-li Lin ◽  
Wei-hua Peng
Keyword(s):  
Heavy Metals ◽  
Temporal Variation ◽  
Coal Mine ◽  
Dominant Species ◽  
Major Ions ◽  
Mining Activity ◽  
Atmospheric Environment ◽  
Limestone Aquifer ◽  
Groundwater Samples ◽  
Representative Samples

Six groundwater samples were collected from four aquifers in Renlou coal mine, northern Anhui Province, China, and concentration, temporal variation and speciation of five heavy metals (Cr, Cu, Ni, Pb and Zn) were analyzed. The results of physicochemical parameters and major ions showed that the selected groundwater were representative samples of Quaternary aquifer (QA), coal measure aquifer (CA), Taiyuan limestone aquifer (TA) and Ordovician limestone aquifer (OA). Cr, Ni and Zn increased in the four aquifers from 2002 to 2014, but Pb decreased from 2006 to 2014. Cu concentration increased in QA and TA, but decreased in CA and OA. Although all monitoring results met the standards recommended by WHO and GB5749-2006, Cr and Cu in some groundwater samples exceeded GB/T 14848-93, especially in CA. Soluble metallic hydroxides were the dominant species of heavy metals in QA, while free ions were the main species in TA and OA. Excepted Ni2+ and Zn2+, CuCO3(aq) and PbCO3(aq) were the dominant species of Cu and Pb in CA, respectively, indicating more CO2 had been flooded and dissolved in groundwater from ground atmospheric environment. The enhanced concentration and special dominant species of heavy metals revealed that the ‘closed’ characteristics of CA in Renlou coal mine might have been broken due to coal mining activity.

Methods for Improving the Efficiency of Steel Modifying

2019 ◽  
Vol 946 ◽  
pp. 215-222 ◽  
Author(s):  
Igor V. Bakin ◽  
Gennady G. Mikhailov ◽  
Valery A. Golubtsov ◽  
Ivan V. Ryabchikov ◽  
Ludmila E. Dresvyankina
Keyword(s):  
Alkaline Earth ◽  
Large Scale ◽  
Metal Structure ◽  
Alkaline Earth Metals ◽  
Alkaline Earth Elements ◽  
Steel Processing ◽  
Modifying Effect ◽  
Metal Products ◽  
Short Time

In connection with the need to improve the quality characteristics of metal products, metallurgists are faced with the task of finding new effective methods for secondary steel processing. It is known that the use of simple, two-component materials does not significantly improve the quality of the metal. Complex modifiers with alkaline-earth elements are increasingly used for the modifying processing of steel. These modifiers allow to influence both the metal structure and the shape, phase composition and physical properties of nonmetallic inclusions. At the same time, it is known that barium and strontium practically do not dissolve in steel and are removed from the alloy in the extremely short time. The ability of barium and strontium alloys to deoxidize and desulphurize is low because of the large atomic mass of these elements. The modifying effect of alkaline-earth elements on the properties of steel is undeniable. This effect can be explained by the ability of barium and strontium to affect the magnitude of inter-phase tension in the event of contact with the phase boundary. The purpose of this work was to generalize the industrial experience of using multicomponent alloys with alkaline-earth elements for modifying of steel. Data on the effects of alloys with alkaline-earth elements on the properties of metals are given, as well as technological features of the use of complex alloys with alkaline-earth metals in steelmaking. Thus, it is noted that in conditions of large-scale steelmaking, a very important factor is the limited time in time of the modifying effect of alloys with alkaline-earth metals, which dictates the necessity of transferring the process of modification directly to casting.

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