scholarly journals OPTIMASI BATUBARA TIPIS (THIN COAL SEAM) DI PIT A SITE SENAKIN PT ARUTMIN INDONESIA

2020 ◽  
Vol 1 (1) ◽  
pp. 81-92
Author(s):  
Yogie Reza Pratama ◽  
Abdul Kahar ◽  
Arif Ridwan
Keyword(s):  
Coal Seam ◽  
Mining Operation ◽  
Optimization Method ◽  
Ash Content ◽  
Coal Extraction ◽  
Minimum Thickness ◽  
Thin Coal Seam ◽  
Key Factor ◽  
Seam Mining ◽  
A Site

ABSTRAK Konservasi cadangan batubara adalah upaya dalam rangka optimalisasi pengelolaan, pemanfaatan, dan pendataan batubara secara terukur, efisien, bertanggung jawab, dan berkelanjutan. Pengelolaan ini dilaksanakan dengan cara melakukan proses penambangan sesuai dengan perencanaan untuk memperoleh recovery penambangan yang optimal serta mengendalikan dilusi dan kehilangan (losses) batubara. Di dalam KEPMEN ESDM No. 1827 K/30/MM/2018 lampiran VII disebutkan bahwa cut off thickness minimum batubara adalah 30 cm. Batas minimum ini diterapkan dalam rangka mengoptimalkan recovery penambangan dan meminimalisir adanya dilusi yang diperoleh selama proses penambangan. Risiko dari penggalian batubara dengan ketebalan kecil dari 30 cm adalah semakin besarnya potensi terjadinya dilusi. Hal ini dikarenakan semakin banyak luasan permukaan batubara yang bersentuhan langsung dengan material pengotor di bagian roof dan floor dibandingkan dengan penggalian batubara. Kondisi tersebut diperparah dengan adanya losses saat menggunakan alat gali yang berukuran besar. Dilusi dan losses ini akan berdampak kepada menurunnya kuantitas, kualitas dan recovery pengolahan batubara. Dalam paper ini akan dibahas mengenai upaya konservasi batubara dari PT. Arutmin Indonesia Site Senakin di Pit A dengan melakukan kajian tentang optimasi penambangan lapisan batubara tipis (thin coal seam) dengan tebal minimum 20 cm. Batas ketebalan minimum ini merupakan batas optimal dari kemampuan peralatan yang digunakan di Senakin. Karakteristik Pit A yang memiliki beberapa sisipan di dalam batubara juga menjadi faktor kunci apakah batubara tipis tersebut layak untuk ditambang. Semakin tebal material sisipan maka kadar abu akan semakin tinggi dan ini akan menjadi acuan terkait keekonomisan batubara tersebut. Secara operasional penentuan ketebalan batubara ini dilakukan oleh Geologist secara aktual di lapangan. Selanjutnya dilakukan analisa sampel batubara tersebut dan jika secara kualitas layak untuk ditambang maka akan dilanjutkan ke dalam tahap operasional penambangan dengan menggunakan alat kelas 20 ton dan 30 ton serta dengan pengawasan khusus selama proses pembersihan, pengumpulan, pemuatan sampai dengan pengangkutan. Batubara tipis tersebut kemudian diolah oleh Washplant yang ada di Senakin dengan recovery pengolahan sekitar 79,3%. Dengan optimasi ini maka akan didapatkan tambahan batubara dengan range 20 – 30 cm sekitar 1,49% dari jumlah cadangan sebelumnya. Berdasarkan hasil dari metode penambangan dan pengolahan tersebut, batubara tipis di Pit A dapat dioptimalkan dalam rangka memenuhi konservasi batubara serta meningkatkan revenue perusahaan dan pemerintah. Kata Kunci :  Batubara tipis, Recovery penambangan, Recovery pengolahan, Konservasi batubara, Kadar Abu  ABSTRACT Coal reserve conservation is an effort to optimize the management, utilization and data collection of coal in a measured, efficient, responsible and sustainable manner. This Management is applied by carrying out the mining process in accordance with the plan to obtain optimal mining recovery with controlled coal dilution and losses.According to Ministerial Decree No. 1827 K / 30 / MM / 2018 in appendix VII stated that the minimum coal cut-off thickness is 30 cm. Coal thickness minimum limit is applied in order to optimize mining recovery and minimize dilution during the mining process. The risk of coal extraction with thickness less than 30 cm has extra potency for dilution because more of coal surface area directly contact with impurity materials on the roof and floor rather than coal excavation. That condition is exacerbated by the lost when using a large digging tool. Dilution and loss will have an impact to the decline of   the quantity, quality and recovery of coal processing. This paper will discussed about coal conservation efforts from PT. Arutmin Indonesia Site Senakin at Pit A. PT. Arutmin Indonesia conducting a study on optimizing  thin coal seam mining with a minimum thickness of 20 cm. Regarding to the  coal thickness minimum limit is the optimal limit of the equipment capabilities used at Senakin. The characteristic of Pit A which has several parting material in coal is also a key factor whether the thin coal is feasible to be mined or not. Parting material thickness will be impacted to the ash content and related to the coal economical. Coal thickness is measured by geologist in the field. Furthermore, the coal sample is analyzed and if it is qualified to be mined it will be proceed to the mining operation stage using 20 tons and 30 tons grade tools also with special supervision during the cleaning, collecting loading and hauling processes. Thin coal is processed using Washplant in Senakin with processing recovery around 79.3%. This optimization method will be resulted an additional coal with a range about 20-30cm around 1.49% of the amount of reserves. The result is thin coal in Pit A can be optimized in order to achieve coal conservation and increase company and government revenue. Keywords: Thin coal, mining recovery, recovery processing, coal conservation, ash content

An innovative approach to thin coal seam mining of complex geological conditions by pressure regulation

2014 ◽  
Vol 71 ◽  
pp. 249-257 ◽  
Author(s):  
Tongbin Zhao ◽  
Zhenyu Zhang ◽  
Yunliang Tan ◽  
Chengzhong Shi ◽  
Ping Wei ◽  
...  
Keyword(s):  
Coal Seam ◽  
Innovative Approach ◽  
Pressure Regulation ◽  
Thin Coal Seam ◽  
Geological Conditions ◽  
Seam Mining

The Research and Development of Hydraulic Support Applied for Thin Coal Seam

2013 ◽  
Vol 397-400 ◽  
pp. 154-156
Author(s):  
De Yu Xie ◽  
Xue Yi Zhao ◽  
An Qi Li
Keyword(s):  
Coal Seam ◽  
Research And Development ◽  
Automatic Control ◽  
Control Function ◽  
Hydraulic Support ◽  
Thin Coal Seam ◽  
Design Characteristics ◽  
Seam Mining ◽  
Design And Manufacture ◽  
Structure And Design

Now thin coal seam mining technology and equipment falls behind and the researches on hydraulic support is not enough, this paper introduces the structure and design characteristics of hydraulic support of thin coal seamm, systematically describes the automatic control function, and establishes simple planar models of thin coal hydraulic support. Successful application of the support provides methods and experiences for design and manufacture of thin coal seam hydraulic support.

The Current Situation and Developing Trend of Extremely Thin Coal Seam Mining of China

2013 ◽  
Vol 295-298 ◽  
pp. 2918-2923 ◽  
Author(s):  
Li Ming Zhang
Keyword(s):  
Coal Seam ◽  
Automatic Monitoring ◽  
Development Trend ◽  
Mining Method ◽  
Mining Equipment ◽  
Coal Seams ◽  
Existing Problems ◽  
Thin Coal Seam ◽  
Equipment Development ◽  
Seam Mining

Degree of mechanization of extremely thin coal seam mining is growing, with introducing the main mining method currently used by the different inclination of the extremely thin coal seams in China, focusing on the different mining technology and related ancillary mining equipment development status and existing problems, and discuss the extremely thin coal seam in the future to realize the remote control, automatic monitoring and unmanned mining development trend.

Recent Patents on Thin Coal Seam Mining Equipment

2020 ◽  
Vol 13 (2) ◽  
pp. 99-108
Author(s):  
Yanxiang Wang ◽  
Daolong Yang ◽  
Bangsheng Xing ◽  
Tingting Zhao ◽  
Zhiyi Sun ◽  
...  
Keyword(s):  
Coal Seam ◽  
Underground Space ◽  
Mining Method ◽  
Mining Equipment ◽  
Coal Seams ◽  
Thin Coal Seam ◽  
Recoverable Reserves ◽  
Working Face ◽  
Geological Conditions ◽  
Seam Mining

Background:: China's thin and extremely thin coal seam resources are widely distributed and rich in reserves. These coal seams account for 20% of the recoverable reserves, with 9.83 billion tons of industrial reserves and 6.15 billion tons of recoverable reserves. Objective: Due to the complex geological conditions of the thin coal seam, the plow mining method cannot be effectively popularized, and the drum mining method is difficult to be popularized and applied in small and medium-sized coal mines, so it is necessary to find other more advantageous alternative mining methods. Methods: The equipment integrates mining operations, conveying operations, and supporting operations, and is suitable for mining short and extremely thin coal seam with a height of 0.35m-0.8m and width of 2m-20m. It has the advantages of the low body of the shearer, no additional support on the working face, and small underground space. The mining efficiency of thin coal seam and very thin coal seam can be improved and the mining cost can be reduced. Results: Thin coal seam shear mining combines mining, conveying, and supporting processes together and has the advantages of a low fuselage, no extra support required for the working face, and feasibility in a small underground space. Conclusion: The summarized mining method can improve the mining efficiency of thin and extremely thin coal seams, reduce mining costs, and incorporate green mining practices, which take both mining economy and safety into account.

Key Parts Structure Optimum Design of Plow

2012 ◽  
Vol 619 ◽  
pp. 115-118
Author(s):  
Bo Zhu ◽  
Hui Li
Keyword(s):  
Coal Seam ◽  
High Speed ◽  
Coupled Model ◽  
Strength Analysis ◽  
Mining Equipment ◽  
Thin Coal Seam ◽  
Reliable Performance ◽  
Structure Strength ◽  
Thin Seam ◽  
Seam Mining

Our country has abundant coal resources, thin seam can reserves 20% of all can be occupied. But , with adverse circumstances, thin coal seam mining has not yet been fully realized automation. Plough is a kind of mining equipment with shallow-frustum, Low mining height, multi circulation.Its simple structure in thin coal seam mining is a unique advantage. Along with the plough development to high-powered, high speed to dig, automation direction, and with its reliable performance problems appear more prominent, it is badly in need of further research and discussion. In order to improve the reliability of plough, expand the scope of use plough, this paper applied the method of virtual prototype of the plough structure strength analysis. Taking a coal company designed BT plough as project object, the joint simulation environment is been established by Pro/E,ANSYS and ADAMS.by using corresponding modal interface technology. At last rigid-flexible coupled model has been formed in ADAM.

Investigation of High Pressure Water Jet with Hydraulic Reaming Drainage Radius for Coal Seam Mining

2012 ◽  
Vol 577 ◽  
pp. 147-150 ◽  
Author(s):  
Yong Jiang Zhang ◽  
Xian Zheng Meng ◽  
Jian Jun Cao
Keyword(s):  
High Pressure ◽  
Coal Seam ◽  
Water Jet ◽  
Gas Pressure ◽  
Coal Extraction ◽  
Drainage Radius ◽  
Pressure Water ◽  
New Type ◽  
High Pressure Water Jet ◽  
Seam Mining

Test mine is a large modern mine, the 13-1 coal-seam original permeability coefficient was low, gas pressure and content were higher, coal seam outburst danger of serious, directly extracting coal gas is difficult. Using a new type of high pressure water jet reaming technology, can achieve the expansion of borehole diameter, increase coal seam exposed area and pressure relief range, thereby improving the coal seam permeability, increased coal seam drainage radius. Investigated on the basis of determination of the original coal seam gas pressure and content of the coal extraction radius after the hydraulic reaming. Provide the basis for the seam of the test area borehole design

scholarly journals Distribution Law of Mining Stress of the Gob-Side Entry Retaining in Deep Mining Thin Coal Seam

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Tao Qin ◽  
Kai Ren ◽  
Chen Jiang ◽  
Yanwei Duan ◽  
Zhi Liu ◽  
...  
Keyword(s):  
Coal Seam ◽  
High Stress ◽  
Horizontal Stress ◽  
Stability Control ◽  
Vertical Stress ◽  
Boundary Line ◽  
Thin Coal Seam ◽  
Working Face ◽  
Distribution Rule ◽  
Seam Mining

In order to explore the mining pressure development rule of gob-side entry retaining during deep thin coal seam mining, FLAC3D numerical simulation is applied to analyze the stress distribution rule of gob-side entry retaining, observing the left third working face of 49# coal seam in No. 8 mining area of Xinxing Coal Mine as the research object. The results show that the working face stress field is asymmetrical which is caused by the reserved roadway and the over goaf. After roadway tunneling, features of obvious stress redistribution are formed. The vertical and horizontal stress in the coal seam develop a U-shaped distribution. The vertical stress in the roadway is less than that in the lower roadway, and the horizontal stress is half that in the lower roadway. The phenomenon of high stress “nucleation” appears and becomes more obvious in the process of working face advancing, and the nuclear body disappears after working face advanced to the boundary line. With the working surface advancing, the trend of horizontal stress of gob-side entry retaining decreases gradually and the vertical stress of gob-side entry retaining is less than the original rock stress. The research findings provide a basis for the supporting design of gob-side entry retaining in the deep thin coal seam and the stability control of surrounding rock.

scholarly journals Selection of an Appropriate Mechanized Mining Technical Process for Thin Coal Seam Mining

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Chen Wang ◽  
Shihao Tu
Keyword(s):  
Coal Seam ◽  
Control Method ◽  
Multiple Criteria Decision Making ◽  
Preference Ranking ◽  
Technical Process ◽  
Mining Operations ◽  
Analytic Hierarchy ◽  
Thin Coal Seam ◽  
Working Face ◽  
Seam Mining

Mechanized mining technical process (MMTP) related to the control method of the shearer is a vital process in thin coal seam mining operations. An appropriate MMTP is closely related to safety, productivity, labour intensity, and efficiency. Hence, the evaluation of alternative MMTP is an important part of the mining design. Several parameters should be considered in MMTP evaluation, so the evaluation is complex and must be compliant with a set of criteria. In this paper, two multiple criteria decision-making (MCDM) methods, Analytic Hierarchy Process (AHP) and Preference Ranking Organization Method for Enrichment Evaluation (PROMETHEE), were adopted for this evaluation. Then, the most appropriate MMTP for a thin coal seam working face was selected in China.

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