STUDY OF METAL MOBILITY IN LABORATORY SCALE FDCLT KINETIC TEST OF LOW SULPHIDATION EPITHERMAL ROCK SAMPLES
Mine water is one of the negative impacts arising from mining activities. Acidic mine water is dominated by sulfates as a result of the reaction of sulfide minerals in rocks exposed to water and oxygen. Additionally, the acidity of mine water characterized by the increased dissolved metals, inclu...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/71191 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Mine water is one of the negative impacts arising from mining activities. Acidic
mine water is dominated by sulfates as a result of the reaction of sulfide minerals
in rocks exposed to water and oxygen. Additionally, the acidity of mine water
characterized by the increased dissolved metals, including trace elements,
compared to water from natural systems. Variations in the geochemical
characteristics of mine water and the possibility of associated metal mobility are
dependent on the interaction of water and rock, so predictions and modeling are
necessary to minimize the impact on the surrounding environment. The purpose of
this study was to determine the potential for the formation of acid mine drainage
as well as the mobility of metals and the characteristics of leach water from rocks
in Low Sulfidation Epithermal (LSE) deposits.
The rock samples from the LSE deposits were characterized geochemically for the
formation of Acid Mine Water (AAT) using static tests, mineralogical tests and
elements, as well as kinetic testing using the free draining column leach test
(FDCLT) method. The leachate resulting from the kinetic test was tested to
determine the physicochemical properties of the leachate. LSE rock samples were
also subjected to seguential extraction and near total acid digestion tests to
calculate the amount and relative mobility of metals in various geochemical
Jractions.
The results showed that rock samples in the same lithology had different
geochemical characteristics of AAT formation, thus affecting the physicochemical
conditions of the leachate resulting from the interaction of water and rocks. There
were 7 samples producing circumneutral leachates and 2 samples with acidic
leachates. Metal mobility in LSE deposits has various characteristics. In general,
metals are bound to the carbonate fraction. The availability and mobility of
mobile metals in the soluble and carbonate fractions as sources of pollutants in
the environment will depend on the physicochemical conditions of the leachate
formed. Rocks that have metal mobility in the carbonate fraction can be readily
dissolved if there is interaction with acidic leachates from other rocks. |
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