http://hdl.handle.net/123456789/9682 Sat, 04 Apr 2026 20:02:08 GMT 2026-04-04T20:02:08Z http://hdl.handle.net/123456789/29963 Preliminary study potential of heavy metals in geothermal sludge Pulungan, Linda; Ashari, Y; Wicaksana, I K One of the New Potential Renewable Energy in Indonesia is geothermal potential which its activity in Indonesia is developed into Geothermal Power Plant XY in West Java and as the utilization of geothermal to reduce the dependency of fossil energy progresses, its utilization will create negative impacts on the environment such as landscapes, noises, subsidence, seismic induction, and heavy metal potential. With this background, it is necessary to conduct the identification of those potentials and the possibility of metals' utilization. The researcher conducted this research by doing identification on dissolved metals types and its potential to harm the environment. The process was conducted by using Atomic Absorption Spectrophotometry (AAS) method. The sampling process performed on solid waste which was the result of geothermal drilling process or Geothermal Sludge and water sample which came off from the PLTP that headed to public waters around citizens residences. The test result of geothermal sludge showed that it contained heavy metals. The water sample collected around citizens residences also showed there were heavy metals. Thu, 30 Aug 2018 00:00:00 GMT http://hdl.handle.net/123456789/29963 2018-08-30T00:00:00Z http://hdl.handle.net/123456789/29960 The research of gold processing from tailings of iron sand processing from South Kalimantan by using amalgamation methods in West Java Pulungan, Linda; Pramusanto, P; Hermana, F A The purpose of this activity was to determine the characteristics of gold contained in iron sand mining tailings based on mineragraphic parameters, gold recovery by amalgamation method, and Hg used and wasted with tailings in the amalgamation process. The results showed the characteristics of gold based on mineragraphic parameters had a bright yellow gold colour, irregular shape, isotropic crystals, low relief, not yet liberated, measuring between 0.04 - 0.25 mm, mostly tied to minerals contains Fe and some binds to non-metallic minerals. The recovery of a pure sample is 90.83%, with the use of mercury 5.6 grams, and the mercury lost with its tailings as much as 6.4 grams. As for the samples that have been recovered, the recovery was 25.5% with the use of 1.4 grams of mercury, and 6.6 grams of mercury lost with tailings. Thu, 30 Aug 2018 00:00:00 GMT http://hdl.handle.net/123456789/29960 2018-08-30T00:00:00Z http://hdl.handle.net/123456789/29948 LOW SULPHIDATION AU-AGEPITHERMAL ASSOCIATED MINERALS USING T2 HOTELLINGS METHOD USMAN, DUDI N.; PULUNGAN, LINDA; WIDAYATI, SRI; HIRNAWAN, FEBRI; NURYAHYA, HIMAWAN; SULAKSANA, NANA; HARYANTO, IYAN The presence of low sulphidation epithermal gold at is a part of the geological process of the Sunda arc, Indonesia. This process encourages the formation of mineralized zones very closely with rock fractures in the Honje Formation and Cipacar Formation. This study describes the role of associated minerals (Ag, Cu, Pb, Zn and As) in Au-Ag Mineralization using the T2 Hotellings method. To obtain field data, namely surface mapping, this study analysed rock sampling for the petrographic test of 17 samples, and drill assay data with drilling depth between 50-450 meters. Meanwhile, the lithological zones were studied by BRAN, VNBR and VEIN and the multivariate normality test showed that the data were multivariate normally distributed between gold (Au) content and associated mineral content. The Multivariate Analysis of Variance average comparison test shows that there is a significant difference between the main mineral content and associated minerals in the lithology of BRAN, VEIN, and VNBR rocks. Minerals Ag, Cu, Pb, Zn and As are significant to Au, although not all lithological zones are significant because the values of the deterministic coefficient are different. Ag in each zone is significant for Au while for Zn and As in each zone is insignificant. Based on the arithmetic regression model on VNBR (Breccia Vein) with a small significance value, it shows that Ag, Cu and Pb influence changes in the grade value of Au. The implication of this research is to provide convenience for metal mineral exploration activities in predicting the role of associated minerals (associated minerals) on the main mineral content, especially for Low Sulphidation epithermal gold (Au). Fri, 01 Jan 2021 00:00:00 GMT http://hdl.handle.net/123456789/29948 2021-01-01T00:00:00Z http://hdl.handle.net/123456789/29947 IMPROVEMENT OF CASSITERITE LEVELS WITH VARIATION OF FEED ROLL AND SEPARATION ROLL SPEED IN HIGH TENSION ROLL SEPARATOR (HTRS) PULUNGAN, LINDA; USMAN, DUDI N.; WIDAYATI, SRI; MAULIDA, SUCI The separation of cassiterite mineral as a concentrate from tin ore was carried out by various gravity separation methods, one of which is using an electrostatic separator with the type of High-Tension Roll Separator (HTRS). This separation is often an obstacle because the level of cassiterite (SnO2), which is a HTRS product, does not meet the requirements for smelting tin ore. The purpose of this study was to obtain cassiterite levels that meet the requirements of the melting unit, namely Sn ≥ 70%. The method used in this research is research and development, where the research variable was carried out from the current condition and developing the research results obtained by optimization experiments. In addition, this study contributes to the process parameters of the HTRS separation. Feed was obtained from the jig with the cassiterite (SnO2) level of 56.97%. Furthermore, the HTRS experimental variable was the feed roll speed varied from 20, 25 and 30 Hz, while the separation roll speed varied from 10, 15, 20, 25 and 30 Hz. As for the results of the research at the initial stage, the cassiterite (SnO2) concentrate product ≥ 70% was produce at a variation of the feed roll speed of 20 Hz and 15 Hz separation roll speed. The results of this study are expected to be use in the processing unit to obtain cassiterite (SnO2) level that meets the requirements of the smelting unit. Tue, 13 Jul 2021 00:00:00 GMT http://hdl.handle.net/123456789/29947 2021-07-13T00:00:00Z