STUDY OF COAL ASH AS COVER LAYERING TO PREVENT THE FORMATION OF ACID MINE DRAINAGE FROM COAL-FIRED POWER PLANT PT INDOMINCO MANDIRI

• Main Author: RAHMA RIZKITA (NIM : 12113004), NIKI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29629
• Institution: Institut Teknologi Bandung

Mining activities are activities which removing overburden, regarding so sulfide minerals exposed so <br /> <br /> that it reacts with mineral water and air, which then formed The Acid Mine Drainage (AAT). AAT is <br /> <br /> characterized by high acidity or low pH values, thereby potentially pollute the environment. AAT must <br /> <br /> be managed, for example coat the rocks of acid-forming (Potential Acid Forming/ PAF) by using a <br /> <br /> material that is not potentially acid forming (Non Acid Forming/NAF) as a coating material that <br /> <br /> rock-forming acid does not react with air and / or water. However, the availability of materials NAF <br /> <br /> in the field is limited, alternative materials are required to meet the material needs of NAF. The <br /> <br /> mixture of coal ash to the overburden can be used as an alternative material to prevent the formation <br /> <br /> of acid mine water. <br /> <br /> Coal ash has alkaline properties that can neutralize acid-forming rocks. In addition, the size of the <br /> <br /> coal ash is relatively smooth, so it can easily fill the pores of coal ash - porous rock to prevent the <br /> <br /> diffusion of oxygen and water. However, coal ash contains metals - heavy metals that can pollute the <br /> <br /> environment. Therefore, it takes a physical and geochemical characterization of coal ash as a <br /> <br /> material mixing to prevent the formation of acid mine water. <br /> <br /> In this study, samples of coal ash was mixed with acid-forming rock samples to determine the ability <br /> <br /> of the coal ash to neutralize the acid. The parameters were reviewed as a result of this study are <br /> <br /> different types of coal ash comprising fly ash and bottom ash, coal ash mass composition used, and <br /> <br /> the grain size of the overburden.Based on research results, different types of ash and grain size did <br /> <br /> not show a difference value pH significantly. However, based on differences in the composition of the <br /> <br /> coal ash used mass showed a significant difference. , On the composition of fly ash at most have an <br /> <br /> average pH value of 7,86, while the composition of the fly ash has at least the average pH value of <br /> <br /> 6,07. On the composition of bottom ash at most have an average pH value of 7,73, whereas at least <br /> <br /> the composition of bottom ash has an average pH value of 4,51 Thus, coal ash can be used as <br /> <br /> material mixing to prevent the formation of AAT. <br />