Ferian Anggara

• Dr. Eng
• Lecturer at Universitas Gadjah Mada

Geopolymers are manufactured using the dry method with fly ash sourced from the Pacitan power plant in East Java (class C) and the Muara Enim Power Plant in South Sumatra (class F). The process begins with preparing the fly ash, followed by solid activators from NaOH and fly ash calcined at 400, 500, and 650 °C to create a geopolymer paste. Compres...

The leaching kinetics of cerium (Ce) and yttrium (Y) in sodium-hydroxide-digested non-magnetic coal fly ash using acetic acid were investigated. The variables analysed were pH, solid-to-liquid ratio (S/L), and temperature. The results show that cerium and yttrium's maximum recovery was 57.33% and 58.36%, respectively, under leaching temperature of...

This research aimed to recover rare earth elements (REEs) from Indonesian coal fly ash (CFA) with high calcium and iron contents using the sequential alkaline-acid leaching method. There were two steps, namely the destruction of the amorphous glass phase in CFA via alkaline leaching, followed by the extraction of REEs from the desilicated residue r...

This review critically examines the potential of a lithium-ion sieve based on titanium for recovering lithium from geothermal brine. Geothermal brine is recognized as a valuable source of lithium, yet its extraction poses notable technical and economic challenges. This study focuses on titanium-based sieves, presenting them as a promising solution...

Coking coal is coal that melts, expands, then reconsolidates during carbonization and can produce coke as an iron refining agent in blast furnaces. Characterization of the potential of coking coal in Indonesia is still being developed. The research was conducted to find out how the potential of coal in the Meliat Formation for coking coal. The purp...

Fly ash and bottom ash (FABA) are residual products from a power plant coal combustion that can be processed into products with economic value. One component of FA that has the potential to proceed is the cenospheres. However, the concentration of cenospheres in FA is limited so further analysis is needed to maximize this potential. The study was c...

Fly Ash and Bottom Ash (FABA), a waste product in the form of ash from the burning coal at coal-fired power plants, is considered to have many advantages as the raw material for construction. One of the construction product examples is a geopolymer. This research aimed to determine the effect of the FABA characteristic on the compressive strength o...

The petrogenetic history of well characterised magmatic rocks may contain invaluable information of paleo-lithospheric thickness and structure that can inform on tectonic evolution. Petrographically distinctive rocks, such as lamprophyres, provide temporal and spatial constraints to build, assess, and verify tectonic models. An alkaline lamprophyre...

Penggunaaan batubara sebagai sumber energi di negara berkembang seperti Indonesia masih menjadi pilihan utama. Hasil samping pembakaran batubara di Pembangkit Listrik Tenaga Uap (PLTU) berupa fly ash dan bottom ash (FABA) akan terus meningkat seriring konsumsi bataubara sebagai energi meningkat. Industri semen dapat mengahsilkan 2,9 miliar ton CO2...

Fly ash and bottom ash (FABA) are inorganic and organic components from coal combustion residue. Samples of FABA were collected from the combustion of the power plant in Ecogreen Oleochemical, Batam. This study aims to examine the composition of FABA in the study area. The organic and inorganic components of FABA are determined by petrographic anal...

Understanding the inhibitory factors affecting the adsorption of CO2 on low-rank coal from shallow-depth coal seams is essential to identify potential coal seams for CO2 sequestration. The CO2 adsorption capacity of shallow-depth coals was measured at a low pressure on raw and dry coals. The samples were also prepared for organic analyses, scanning...

The Tanjung Formation in South Borneo Province, Indonesia, is well-known as an extensive Eocene coal-bearing formation and is economically significant. Coal samples were collected from an open pit mine in Senakin area to study its characteristics. A combination of detailed petrographic composition and geochemical analysis has been used to reconstru...

In this study, the CO 2 adsorption capacity was measured on Indonesian low-rank coals in the raw and dry conditions in powder and block states using different coal sample preparation to estimate CO 2 sequestration and storage potential. Coal sample specimens were taken from three different areas in the South Sumatra Basin, Indonesia. The adsorption...

Observation of the coal cleats of the Muara Enim Formation in Tanjung Agung coalfield aims to characterize the cleat properties and interpret their implications for fluid flow. This study used the scanline method to measure cleat attributes in the form of orientation, aperture, spacing, filler, and cleat connectivity. The face cleat was dominated b...

Syn-sedimentary mafic volcanism has been identified within a rift setting (Eocene Tanjung Formation) in the Senakin Peninsula, southeast Kalimantan. Fine-grained, dark-grey basalt lava occurs and has prominent vertically oriented columnar jointing. Petrographically, the basalt is composed of small euhedral pyroxene, olivine, and lath-shaped plagioc...

Merapi eruption in 2010 produced 17 km high column of ash and southward pyroclastic density current (PDC). Based on the deposits characteristics and distributions, the PDC is divided into channel and overbank facies (pyroclastic flow), and associated diluted PDC (pyroclastic surge). The hot overbank PDCs and the associated dilute-detached PDCs are...

Macroscopic texture in coals is not much getting attention to identify, becauseit is believed it doesn’t hold much information about the coal characteristics. It is nottrue because some of important coal characteristics lie in its organic content which is reflected in its macroscopic texture (Moore, 2016). Conventional petrographic method using cru...

ABSTRAK Formasi Muara Enim pada cekungan Sumatra Selatan memiliki potensi produksi gas metana batubara (GMB) yang tinggi (Sosrowidjojo dan Saghafi, 2009). Estimasi kandungan GMB menggunakan log geofisika, berbeda di setiap lapangan karena parameter penilaian yang berbeda (Fu, et al, 2009; Deng, et al., 2013). Penelitian ini bertujuan untuk memperol...

Erupsi Merapi 2010 merupakan salah satu erupsi Merapi terbesar dalam 100 tahun terakhir dengan Volcano Explosivity Index (VEI) mencapai 4. Aliran utama dari produk yang dihasilkan mengarah selatan-barat daya melalui sungai-sungai seperti Kali Gendol, Kali Kuning dan Kali Woro. Kerusakan yang terjadi di area pemukiman sekitar Kali Gendol utamanya di...

The South Sumatra Basin is one of the most prolific coal basins in Indonesia. Most of the coal from this area is used as thermal coal. Seredin and Dai (2012) explained the importance and significance of coal deposits as potential sources for rare earth elements and yttrium (REY); the concentrations of these elements in coal are similar to their abu...

Berdasarkan peneliti terdahulu intrusi yang tersingkap di beberapa tempat di tambang batubara Bukit Asam mempengaruhi peringkat batubara secara lokal. Tujuan dari penelitian ini adalah untuk mengetahui komposisi mineral dan geokimia dari tiga sampel intrusi yang diambil di lokasi penelitian. Sampel intrusi diambil di Tambang Air Laya, tambang batub...

This study investigates the relationship between Kushiro lignite-subbituminous coal matrix swelling and gas permeability during CO2 sequestration. Banded and non-banded coal samples have been used in swelling experiments. Banded coal samples tend to have anisotropic swelling, whereas non-banded samples tend to have isotropic swelling. The ratio of...

This study investigates the relationship between Kushiro lignite-subbituminous coal matrix swelling and gas permeability during CO2 sequestration. Banded and non-banded coal samples have been used in swelling experiments. Banded coal samples tend to have anisotropic swelling, whereas non-banded samples tend to have isotropic swelling. The ratio of...

This presents study investigate the effect of swelling on gas production performances at coal reservoirs during CO2-ECBMR processes. The stressdependent permeability-models to express effect of coal matrix shrinkage/swelling using Palmer and Mansoori (P&M) and Shi and Durucan (S&D) models were constructed based on present experimental results for t...

The development and advancement of new technologies have been considered for carbon fixation and its effective utilization as being indispensable for the achievement of greenhouse gas emissions reduction targets without adversely impacting economic growth in the world. Among such technologies, the one considered to present the greatest potential in...

CO2 Supercritical Fluid Extraction (SFE) has been performed on Kushiro coal. The results showed there were slightly changes in major metal oxide due to mineral dissolution/precipitation during CO2 injection. To predict mineral dissolution/precipitation in the field scale and for long geologic period of time, numerical simulations using GMG-GEM simu...

Coal swelling in the presence of water as well as CO2 is a well-known phenomenon, and these may affect the permeability of coal. Quantifying swelling effects is becoming an important issue to verify the suitability of particular coal seams for CO2-enhanced coal bed methane recovery projects. In this report, coal swelling experiments using a visuali...

Permeability of coal seam have a strong effect on CO2 Enhanced Coal Bed Methane Recovery(CO2-ECBMR) project. In particular, qualification of permeability reduction due to coal matrix swelling is a key parameter to control CO2 injection and the project sustainability. Swelling experiments using visualization method were conducted. Crushed samples fr...

CO 2 injection into coal seams is a very attractive option for geological storage, since CO 2 is readily adsorbed by the coal. At the same time, the injected CO 2 displaces adsorbed methane from the coal's internal surface. Consequently, injection of CO 2 into a coal bed can enhance the recovery of coal bed methane (ECBM). In order to explore this...