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Pengaruh Pengurangan Setting Time (Wait on Cement) pada Semen Tahan Api dengan Penambahan Oil Well Cement Bayu Rahmadika; Yayuk Apriyanti; Irvani Irvani
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Underground Coal Gasification (UCG) is a technology to extract coal deposits in the form of gas from mineral deposit without disassembling of overburden. There are some initial processes in UCG, one of them is cementing to glue the casing into the formation. This research-based laboratory using cement mixture that consists of Fire Mortar as the main ingredients with added Oil Well Cement (OWC) by 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5% and 60% of the total weight of the cement mixture. Cement samples were then tested with hydration heat test, furnace test at temperatures of 300°C to 900°C and UCS test of a sample at normal temperature as well as samples that have undergone combustion at a certain temperature. Composition of OWC>50% have faster setting time on the 29th to 40th hours with maximum hydration temperature of 34.4°C on the 11th to the 12th hour as well as getting the optimal composition of Fire Mortar which is 42.5% and OWC which is 57.5%. Composition of 50-60% Fire Mortar have a heat resistance to a maximum of 900°C so they don’t experience failure and cracks which make a sample split. Ofter than that, composition of 50-60% OWC on average have a greater compressive strength with the highest compressive strength value of 1.75 MPa at a temperature of 500°C.

Analisis Kestabilan Lereng Menggunakan Metode Slope Mass Rating (SMR) dan Software Geoslope/W 2007 pada Tambang Air Laya Selatan Lokasi Suban Di PT Bukit Asam (Persero) Tbk Nabila Faradibah; Yayuk Apriyanti; Irvani Irvani
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Bukit Asam (Persero) Tbk was one of the Indonesian State Owned Enterprises which conduct tocoal mining. During the process of coal mining, demolition overburden resulted in a change of forceand also set up new structures and caused differences in stress distribution thereby changing thestrength of the rock mass. This result the mining slope becomes unstable and could cause a lot ofharm, therefore the analysis of slope stability was carried out. This study was conducted todetermine the quality of the rock mass slope based on the value SMR (Slope Mass Rating), directionof failure using the analysis of kinematics by Dips software and Safety Factor value (SF) based onMorgenstern Price method using Software Geoslope / W 2007. The data used in this study includesdata UCS, RQD, spacing of discontinuity, discontinuity conditions, groundwater conditions and data ofdiscontinuity orientation. Data retrieval was divided into 9 scanline slopes. The analysis indicatedquality of the rock mass and degree of slope stability based on the SMR for scanline I, VII and IX werevery good with a very stable condition, Scanline II, III, IV, V, VI and VIII had good quality with a steadyslope conditions. The Possibility of slope failure occured only in several blocks for Scanline II, IV, V, VIand VIII. After the analysis of kinematics for Scanline III, IV and V had directions of failure to ScanlineIII was N 490 E, Scanline IV was N 500 E and Scanline V was N 480 E. Values of Safety Factor (SF)single slopes from 9 scanline was estimated to 3.254 - 44.737 (safe condition) and the overall slope of1.85 to 4.09 (safe condition). It was concluded that overall the existing slope on the location Subanwere in a safe condition for SF value >1.25.

Pemanfaatan Bunga Matahari Dengan Teknologi Fitoremediasi Untuk Pemulihan Lahan Bekas Tambang Timah di Bangka Belitung Hisyam, Endang Setyawati; Putri, Adriyana; Karmini, Resti; Serly, Serly; Apriyanti, Yayuk
MINERAL Vol 9 No 2 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i2.5516

Post-mining due to mining activities will produce heavy metals in the form of acidic water and accumulate in the land. The poor quality of the land used by tin mining causes damage to the land ecosystem so that the land cannot be regrown by vegetation and the Pb (Lead) content in tin tailings is 6.29 ppm. The aim of this research is land restoration, namely carrying out revegetation using sunflower plants to absorb the heavy metal Pb with the concept of edutourism. The method used is a simulation of planting sunflowers on an ex-mining area of 1 Ha, with a planting distance of 1 m, the number of sunflower plants is 8540. The research results show that with the sunflower garden concept by planting 8540 sunflowers, the Pb level that can be absorbed by the plants is 2.8310 kg.

Pengaruh Pengurangan Setting Time (Wait on Cement) pada Semen Tahan Api dengan Penambahan Oil Well Cement: The Effect of Reducing Setting Time (Wait on Cement) on Fire Mortar by Increasing Oil Well Cement Rahmadika, Bayu; Apriyanti, Yayuk; Irvani, Irvani
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v2i1.1548

Underground Coal Gasification (UCG) is a technology to extract coal deposits in the form of gas from mineral deposit without disassembling of overburden. There are some initial processes in UCG, one of them is cementing to glue the casing into the formation. This research-based laboratory using cement mixture that consists of Fire Mortar as the main ingredients with added Oil Well Cement (OWC) by 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5% and 60% of the total weight of the cement mixture. Cement samples were then tested with hydration heat test, furnace test at temperatures of 300°C to 900°C and UCS test of a sample at normal temperature as well as samples that have undergone combustion at a certain temperature. Composition of OWC>50% have faster setting time on the 29th to 40th hours with maximum hydration temperature of 34.4°C on the 11th to the 12th hour as well as getting the optimal composition of Fire Mortar which is 42.5% and OWC which is 57.5%. Composition of 50-60% Fire Mortar have a heat resistance to a maximum of 900°C so they don’t experience failure and cracks which make a sample split. Ofter than that, composition of 50-60% OWC on average have a greater compressive strength with the highest compressive strength value of 1.75 MPa at a temperature of 500°C.

Analisis Kestabilan Lereng Menggunakan Metode Slope Mass Rating (SMR) dan Software Geoslope/W 2007 pada Tambang Air Laya Selatan Lokasi Suban Di PT Bukit Asam (Persero) Tbk: Slope Stability Analysis using Slope Mass Rating (SMR) method and Software Geoslope/W 2007 at South Tambang Air Laya Location Suban in PT Bukit Asam (Persero) Tbk Faradibah, Nabila; Apriyanti, Yayuk; Irvani, Irvani
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v1i1.1605

PT Bukit Asam (Persero) Tbk was one of the Indonesian State Owned Enterprises which conduct tocoal mining. During the process of coal mining, demolition overburden resulted in a change of forceand also set up new structures and caused differences in stress distribution thereby changing thestrength of the rock mass. This result the mining slope becomes unstable and could cause a lot ofharm, therefore the analysis of slope stability was carried out. This study was conducted todetermine the quality of the rock mass slope based on the value SMR (Slope Mass Rating), directionof failure using the analysis of kinematics by Dips software and Safety Factor value (SF) based onMorgenstern Price method using Software Geoslope / W 2007. The data used in this study includesdata UCS, RQD, spacing of discontinuity, discontinuity conditions, groundwater conditions and data ofdiscontinuity orientation. Data retrieval was divided into 9 scanline slopes. The analysis indicatedquality of the rock mass and degree of slope stability based on the SMR for scanline I, VII and IX werevery good with a very stable condition, Scanline II, III, IV, V, VI and VIII had good quality with a steadyslope conditions. The Possibility of slope failure occured only in several blocks for Scanline II, IV, V, VIand VIII. After the analysis of kinematics for Scanline III, IV and V had directions of failure to ScanlineIII was N 490 E, Scanline IV was N 500 E and Scanline V was N 480 E. Values of Safety Factor (SF)single slopes from 9 scanline was estimated to 3.254 - 44.737 (safe condition) and the overall slope of1.85 to 4.09 (safe condition). It was concluded that overall the existing slope on the location Subanwere in a safe condition for SF value >1.25.

Pemanfaatan Bunga Matahari Dengan Teknologi Fitoremediasi Untuk Pemulihan Lahan Bekas Tambang Timah di Bangka Belitung: Utilization of Sunflowers with Phytoremediation Technology for Restoring Ex-Tin Mining Land in Bangka Belitung Hisyam, Endang Setyawati; Putri, Adriyana; Karmini, Resti; Serly, Serly; Apriyanti, Yayuk
MINERAL Vol 9 No 2 (2024): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i2.5516

Post-mining due to mining activities will produce heavy metals in the form of acidic water and accumulate in the land. The poor quality of the land used by tin mining causes damage to the land ecosystem so that the land cannot be regrown by vegetation and the Pb (Lead) content in tin tailings is 6.29 ppm. The aim of this research is land restoration, namely carrying out revegetation using sunflower plants to absorb the heavy metal Pb with the concept of edutourism. The method used is a simulation of planting sunflowers on an ex-mining area of 1 Ha, with a planting distance of 1 m, the number of sunflower plants is 8540. The research results show that with the sunflower garden concept by planting 8540 sunflowers, the Pb level that can be absorbed by the plants is 2.8310 kg.

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