MODELING OF SUMP WATER QUALITY at COAL MINING PIT
Most coal mining in Indonesia operates with open pit mining. The main problem faced by open coal mining is the exposure the rocks forming of AAT and have potential for environmental problems. The first step taken is determine the geochemical characteristics of rocks to predict the establishment of A...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/44022 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Most coal mining in Indonesia operates with open pit mining. The main problem faced by open coal mining is the exposure the rocks forming of AAT and have potential for environmental problems. The first step taken is determine the geochemical characteristics of rocks to predict the establishment of AAT in the mining pit, especially in the sump. The purpose of this study is geochemical modeling of sump in the mining pit based on rock distribution conditions and rock geochemical characteristics.
Geochemical characterization of rocks can be determined with mineralogical tests, static tests and kinetic tests to see how the influence of rocks in forming acidity. From these results it can be seen how much the influence of rocks in producing AAT.
In addition to testing, geochemical characteristics can also be modeled with the help of PHREEQC software. From the PHREEQC software modeling, it can be seen how the chemical reaction patterns that play a role in the establishment of acidity in mining pit sump. Modeling will do it with several scenario models based on the shape of the mining pit wall. The modeling conducted by the quality of well water is influenced by the chemical content of water, rock mineralogy and mole transfer which affects the sulfide oxidation reaction.
From the observations, the samples were representing the pit walls are 05, 09, 10, 15, 18, 19 and 20. From the results of the PHREEQC modeling conducted it can be concluded that the model was closest to the quality of wells in the field is model B the proportion of the area in the total mixing scenario shows the amount of content from the simulation results is the closest to the existing water quality sump results. Then, based on the condition of cation and anion content of model B the proportion of the total area under the total mixing scenario is the closest to the existing water quality results. |
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