Rotary Separator Centrifugal-Based: Separation of the Na-Cl Geothermal Fluids and Au in Parabakti Field, Mount Salak

Abstract

Parabakti geothermal field is located in the area of Mount Salak included in volcanic zones Quarter (Calc - Alkaline) and has capacity 377 MW geothermal energy. All types of reservoir water wells are drilled Chloride with values > 7000 ppm. While on the surface, almost all wells are drilled in areas with acid sulphate type water, with chloride content almost < 5ppm, and a small portion in the area of type bicarbonate with chloride content of between 5 - 50 ppm. The assessment also uses the measured reservoir temperature data from boreholes around the geothermal field Parabakti ranging between 215 - 281oC or 420 - 538oF, where the temperature increases to the west. The area of the reservoir is approximately 7km2, with an average thickness of 1700 meters. lnterference test shows the total volume of the reservoir 65 to 100 km3. The variation in pressure between 85 bar at -100 meters. The chemical composition of the fluid changes affect rock petrology. Mineral alteration in geothermal field Parabakti is a Quartz, Calcite, Chlorite, Epidote and clay minerals type identifier that is temperature and permeability. Chlorite emerged from depths of 500 feet while Epidote appear near the top of the reservoir. The peak of the high percentage of Epidote are shown in measured temperature at 462 - 483oF. Argillic zone is a zone Parabakti geothermal field covers that are impermeable layer, while below it is permeable propylitic zone and a zone of argillic zones where production began minerals present and the peak percentage of chlorite and Epidote. Potassic zone are also found local production. So to make it easier to extract gold deposits, created a tool called the Rotary Separator which act as filter and separator. Rotary separator uses centrifugal force to separate the water from the steam. Centrifugal force causes the water to stick to the wall and because gravity will move downwards in a spiral and out of the separator through a tangential pipe. While entering into a spiral of steam in the pipe at the center and flows out of the separator. In a geothermal field pressure is high enough, the separator can be made order two or three storey terraced.