scholarly journals Optimalisasi Spasi Ripping Bulldozer terhadap Fragmentasi Batubara Seam B2 di Tambang Banko Barat PT X Desa Tanjung Enim, Kecamatan Lawang Kidul, Kabupaten Muara Enim, Provinsi Sumatera Selatan

2021 ◽  
Vol 1 (1) ◽  
pp. 1-7
Author(s):  
Hafizh Nurul Fauzi ◽  
Zaenal ◽  
Sriyanti
Keyword(s):  
Coal Mining ◽  
Cycle Time ◽  
Mechanical Equipment ◽  
Coal Production ◽  
Work Efficiency ◽  
Large Size ◽  
Strip Mine ◽  
Ripping Production ◽  
Improvement Effort ◽  
Production Target

Abstract. Coal mining at PT X Banko Barat site uses the Strip Mine type Open Mine System using mechanical equipment. To breaking coal from Pit 1 Timur using ripping with the Komatsu D 375 Bulldozer A. As for the digging and loading using Backhoe Komatsu PC 400 and Backhoe Hitachi ZX 470 Lc The problem with the company is the large size of the fragmentation of ripping coal which is greater than 20 cm which is not in accordance with the specifications of the grizzly dump hopper, so there must be a reduction in the size of the coal back by the backhoe so that production is getting lower. This study aims to optimize the ripping bulldozer space on coal so that it will produce coal fragmentation smaller than the actual ripping and the effect of coal fragmentation on bulldozer and backhoe production. The research included taking data of bulldozer cycle time ripping, backhoe cycle time, bulldozer obstacle time, backhoe obstacle time, coal density and coal fragmentation. From these data we will know the effect of bulldozer ripping spacing on the fragmentation of coal produced and the effect on bulldozer and backhoe production. For the East Pit coal production target, West Banko is 360,000 tons/ month. The actual bulldozer ripping space is 80 cm with B2 coal fragmentation yield of more than 20 cm is 11.36% with 363,476.74 tons/month ripping bulldozer and backhoe production 363,477.32 tons/month. For the 60 cm ripping spacing improvement, the B2 coal fragmentation yield of more than 20 cm is 3.05% with a bulldozer ripping production of 347,670.27 tons/month and backhoe production of 347,670.7 tons/month. As for the 40 cm ripping spacing improvement, B2 coal fragmentation which is more than 20 cm is 1.58% with a bulldozer ripping production of 288,922.03 tons / month and backhoe production of 288,922.9 tons/month. Based on the results of the study, coal fragmentation of more than 20 cm has reached the Company's SOP, which is less than 2%, but the production target has not been reached, so efforts must be made to improve. The improvement effort is by adding a bulldozer and increasing the bulldozer work efficiency. Bulldozer production was obtained at 385,229.37 tons/month and backhoe production at 385,229.60 tons/month so as to reach the production target. Abstrak. Penambangan batubara pada PT X Site Banko Barat menggunakan Sistem Tambang Terbuka tipe Strip Mine dengan menggunakan peralatan mekanis. Untuk memberaikan batubara pada Pit 1 Timur menggunakan ripping dengan Bulldozer Komatsu D 375 A. Sedangkan untuk penggalian dan pemuatannya menggunakan Backhoe Komatsu PC 400 dan Backhoe Hitachi ZX 470 Lc. Adapun masalah pada perusahaan adalah banyaknya ukuran fragmentasi batubara hasil ripping yang lebih besar dari 20 cm yang tidak sesuai dengan spesifikasi grizzly dump hopper, sehingga harus ada pengecilan ukuran batubara kembali oleh backhoe sehingga produksinya semakin rendah. Penelitian ini bertujuan untuk mengoptimalkan spasi ripping bulldozer pada batubara sehingga akan menghasilkan fragmentasi batubara yang lebih kecil dibandingkan dengan ripping aktualnya dan pengaruh fragmentasi batubara terhadap produksi bulldozer dan backhoe. Penelitian meliputi pengambilan data cycle time ripping bulldozer, cycle time backhoe, waktu hambatan bulldozer, waktu hambatan backhoe, densitas batubara dan fragmentasi batubara. Dari data tersebut akan diketahui pengaruh dari spasi ripping bulldozer terhadap fragmentasi batubara yang dihasilkan serta pengaruh terhadap produksi bulldozer dan backhoe. Untuk target produksi batubara Pit Timur, Banko Barat adalah 360.000 ton/bulan. Spasi ripping bulldozer aktual adalah sebesar 80 cm dengan hasil fragmentasi batubara B2 yang lebih dari 20 cm adalah 11,36% dengan produksi ripping bulldozer sebesar 363.476,74 ton/bulan dan produksi backhoe sebesar 363.477,32 ton/bulan. Untuk spasi ripping perbaikan 60 cm dengan hasil fragmentasi batubara B2 yang lebih dari 20 cm adalah 3,05% dengan produksi ripping bulldozer sebesar 347.670,27 ton/bulan dan produksi backhoe sebesar 347.670,7 ton/bulan. Sedangkan untuk spasi ripping perbaikan 40 cm dihasilkan fragmentasi batubara B2 yang lebih dari 20 cm adalah 1,58% dengan produksi ripping bulldozer sebesar 288.922,03 ton/bulan dan produksi backhoe sebesar 288.922,9 ton/bulan. Berdasarkan hasil penelitian, fragmentasi batubara yang lebih dari 20 cm telah mencapai SOP Perusahaan yaitu kurang dari 2%, tetapi target produksinya tidak tercapai, sehingga harus ada upaya perbaikan. Adapun upaya perbaikannya adalah dengan menambahkan satu alat bulldozer dan meningkatkan efisiensi kerja bulldozer. Didapatkan produksi bulldozer sebesar 385.229,37 ton/bulan dan produksi backhoe sebesar 385.229,60 ton/bulan sehingga telah mencapai target produksi.

Chances and Threats of Hard Coal Mining Development in Poland – The Results of Experts Research/Szanse I Zagrożenia Dla Rozwoju Górnictwa Węgla Kamiennego W Polsce – Wyniki Badań Eksperckich

2014 ◽  
Vol 59 (2) ◽  
pp. 395-411 ◽  
Author(s):  
Józef Dubiński ◽  
Marian Turek
Keyword(s):  
Coal Mining ◽  
Present Situation ◽  
Hard Coal ◽  
Coal Production ◽  
Actual Situation ◽  
Mining Sector ◽  
Energy Carriers ◽  
Hard Coal Mining ◽  
Adverse Influence ◽  
Other World

Abstract The actual situation of hard coal mining in Poland has been presented. In particular, these factors, which have impact on the competiveness of mining sector were highlighted and need of its improving has been stressed. Outlining present situation of hard coal mining an attention was paid to its specific threats. The primary analytical material is based on the results of questionnaire conducted among 92 specialists and experts from the mining sector. The questions were related to chances and threats for development of hard coal mining in Poland. The factors determining them were grouped in such domains as economy, technology, geology, social and law aspects. Moreover, the special attention was paid to the problem of increasing and high costs of coal production which constitute significant threat for the financial and economic situation of the mining enterprises. Also the adverse influence of these high cost on the competitiveness of Polish hard coal with other world producers and with other energy carriers was emphasized. The conclusions summarize the achieved results of analysis.

ENVIRONMENTAL IMPACT OF COAL MINING

2020 ◽  
Author(s):  
Наталья Алексеевна Бойко ◽  
Наталья Владимировна Ромашева
Keyword(s):  
Environmental Impact ◽  
Organizational Structure ◽  
Coal Mining ◽  
Negative Impact ◽  
Coal Industry ◽  
Coal Production ◽  
Atmospheric Air

Представлена характеристика угольной отрасли России по таким направлениям как организационная структура, объем и регионы добычи, потребители угля. Выявлены положительные тенденции, определены проблемы в развитии угольной промышленности. Исследованы негативное воздействие угольного производство на такие компоненты окружающей среды, как атмосферный воздух, водные ресурсы, земная поверхность. The characteristic of the Russian coal industry in such areas as the organizational structure, volume and regions of production, coal consumers has been presented. Positive trends and problems in the development of the coal industry have been identified. The negative impact of coal production on environmental components such as atmospheric air, water, the earth’s surface has been investigated.

scholarly journals CONTRIBUTION OF MOTION STUDY TO STANDARD TIME AT BALL TEA STATION (CASE STUDY PT. MITRA KERINCI, SOUTH SOLOK)

2021 ◽  
Vol 11 (2) ◽  
pp. 92-107
Author(s):  
Aldino Rizki Prayoga ◽  
Meizul Zuki ◽  
Yusril Dany
Keyword(s):  
Standard Deviation ◽  
Cycle Time ◽  
Standard Time ◽  
Motion Study ◽  
Uniformity Test ◽  
Time Calculation ◽  
Calculation Results ◽  
Increase In Productivity ◽  
Flow Map ◽  
Production Target

PT Mitra Kerinci is a company established in West Sumatra Province which is engaged in tea plantations and tea processing in its factories. PT Mitra Kerinci produces an average of 7,000 kg or 7 tons of green tea shoots per day. The production process for processing tea shoots, the factory sometimes does not reach the production target in accordance with the production target of the company. The goal of research  to determine the amount of the contribution of the motion study to the standard time and determine the amount of the contribution of the standard time to the increase in productivity in the final drying process at Ball Tea station, the production of tea shoots at PT. Kerinci Partners. This research an experimental research type and uses the same subject research design (treatment by subject design), namely the treatment is imposed on the same subject. The results of time calculations after the motion study on the process flow map reached 15,676.02 seconds. Then proceed with the calculation of the cycle time which reaches 825.41 seconds with the actual standard deviation obtained at 3.58 and the standard deviation of the subgroup distribution is 1.79. After knowing the results of the average cycle time, the actual standard deviation and the standard deviation of the subgroup distribution, the data uniformity test was continued, starting with calculating the BKA and BKB. The BKA calculation results obtained 830.78 and the BKB reached 820.04. So that in the data uniformity test the results reached 0.908. In the series of movements of the left and right hands after the repair, a cycle time of 825.41 seconds / unit of Ball Tea was obtained from the previous time, reaching 906.66 units / Ball Tea and getting a time difference of 81.25 seconds. In the calculation of the standard time, the normal time calculation is carried out first, after it is known that the result of the adjustment calculation reaches 1.12 so that the normal time is obtained with a total of 924.45 seconds. Continue to calculate the standard time and the results reach 1423.65 seconds with an allowance of 54%. This contributed to an increase in productivity by 5.7%.

scholarly journals Coal pricing mechanism of some countries in the world and lessons learned for Vietnam national Coal – Mineral industries holding corporation limited

2020 ◽  
Vol 61 (5) ◽  
pp. 60-67
Author(s):  
Tan Cong Nguyen ◽  
Ha Thu Thi Luu ◽  
Bich Thi Dong ◽  
Keyword(s):  
Coal Mining ◽  
Lessons Learned ◽  
Market Mechanism ◽  
Coal Production ◽  
Coal Price ◽  
Pricing Mechanism ◽  
The World ◽  
Coal Market ◽  
Deep Integration ◽  
Mineral Industries

As one of the two largest coal production and trading units in Vietnam, Vietnam National Coal - Mineral Industries Holding Corporation Limited (Vinacomin) is still operating both under the planning mechanism and the market mechanism. Additionally, in recent years, the group's coal price is also being built under these mechanisms. In the context of increasingly deep integration, fluctuating coal price and market, the competition of imported coal is getting more and more fierce, while coal mining conditions are increasingly difficult, the coal production and trading still have many shortcomings, so it is necessary to have a coal price determination mechanism accordance with the actual conditions of the Vietnamese coal market. Therefore, in order to determine the coal price scientifically and in association with practice, the reference to the coal pricing mechanism in some countries around the world to draw lessons for Vinacomin plays an important role. The content of this article mentions the coal pricing mechanism in some countries with a large amount of coal mining and consumption such as China, Australia, Russia, Indonesia,... thereby giving a comprehensive view of the coal price management, operation and construction mechanism of some coal markets in the world and as a reference basis for Vinacomin.

scholarly journals Reduction of Dust in the Longwall Faces of Coal Mines: Problems and Perspective Solutions

2021 ◽  
pp. 84-97
Keyword(s):  
Coal Mining ◽  
Renewable Energy Sources ◽  
Coal Mines ◽  
Mining Industry ◽  
Dust Concentration ◽  
Dust Particles ◽  
Coal Production ◽  
Mining Operations ◽  
Dust Composition ◽  
High Dust

Despite the increasing reliance on alternative and renewable energy sources in recent years, coal is set to continue being the most vital element of the global energy sector. The world coal supply (1,070 billion tons) shall last for 130 years with the current mining levels. In contrast to some large countries (such as the USA and Germany) reducing their coal production and consumption, Russia plans to increase the coal production levels as part of its strategy regarding the future of the coal mining industry. The annual volume of coal output is more than 440 million tons, 1/3 of which is extracted underground. The current and projected levels of underground coal mining present a set of issues pertaining to elevated dust concentration in the air and increased dust dispersion. High dust concentration in the air leads to damage to the skin, mucous membranes and respiratory organs of workers. Also, with high dust content, visibility in the longwalls decreases, the risk of injury and accidents increases. The present article deals with the formation of detrimental dust conditions that happen in the course of cleaning and preparatory mining operations in coal mines. The article reviews the international practices on dust reduction in coal mining operations and provides an overview of studies on dustiness levels and airborne dust composition in longwall faces of coal mines. It also presents mathematical models dealing with projections on dust composition, including projections on most hazardous dust particles the size of 0.1-10 and 0.1-35 μm. The article also presents a newly developed wetting method showing increased effectiveness.

scholarly journals Technogenic carbonaceous objects of the Chervonohrad mining and industrial district and some technical solutions for their using

2019 ◽  
Vol 4 (181) ◽  
pp. 45-65
Author(s):  
Dmytro BRYK ◽  
Oleg GVOZDEVYCH ◽  
Lesya KULCHYTSKA-ZHYHAYLO ◽  
Myroslav PODOLSKYY
Keyword(s):  
Coal Mining ◽  
Coal Ash ◽  
Energy Utilization ◽  
Coal Waste ◽  
Coal Production ◽  
Industrial District ◽  
Waste Dumps ◽  
Wide Range ◽  
Coal Wastes ◽  
The Impact

Ukraine has significant coal resources. Chervonohrad Mining and Industrial District is the main coal complex in the west of Ukraine. In recent years, the average annual coal production in the mines of Chervonohrad Mining and Industrial District has amounted to 1.5 bn t, coal ash varies over a wide range of 25 to 53 %, average coal ash content of about 40 %. Coal mining has produced millions of tons of coal waste every year. Concentration of technogeneous coal objects (mines, mining infrastructure, coal-mining waste dumps and wastes of coal enrichment) in a relatively small area has caused environmental degradation. Therefore, technological and environmental aspects of carbon-containing technogenic objects are particularly important and actual. Coal-waste dumps in the territory of Chervonohrad Mining and Industrial District are characterized in detail. The dumps cover different areas – from 9–10 to 29–30 ha, the height of the dumps reaches 62 m at the mostly heights of 25–40 m. The total waste deposit in the dumps of existing mines has a volume of more than 20 million m3. The coal wastes from Mezhyrichanskaya mine coal-waste dump was investigated to determine the suitability for thermochemical processing. Technical characteristics of taken coal-waster samples is presented. The technogenic carbonaceous objects and the impact to the environment are evaluated. The developed and patented technical and technological solutions for the technogenic carbonaceous objects using are considered. It is shown that the concept of industrial development of coal wastes dumps is based on two aspects – extraction of valuable mineral components and energy utilization of carbonaceous wastes of coal production. Its patented as Patents of Ukraine technological schemes for terrestrial process in of solid carbonaceous raw material from dumps and sludges with the production of coal tar and synthesis gas CO + H2 are presented, as well as the scheme of a system for utilization of heat from coal dump. Recommendations for the implementation of innovative technologies are based on the results of the laboratory research. The purpose of the resolution is to obtain valuable components and energy from coal wasters while improving the environment.

Introduction

2016 ◽  
Author(s):  
Joseph D. Witt
Keyword(s):  
Elementary School ◽  
Coal Mining ◽  
Labor Unions ◽  
Processing Plant ◽  
Preparation Process ◽  
Coal Preparation ◽  
Political Pressure ◽  
Earthen Dam ◽  
Mountaintop Removal ◽  
Strip Mine

In the summer of 2009, I participated in a rally against mountaintop removal coal mining in Appalachia. The rally was held on the grounds of Marsh Fork Elementary, a school situated between the Coal River and Route 3 in Raleigh County, West Virginia. Sitting immediately below a slurry impoundment (a giant reservoir of toxic coal sludge produced by the coal preparation process and retained by an earthen dam), Marsh Fork Elementary also sat at the center of many debates surrounding the safety and justness of mountaintop removal. Activists cited increased health problems for Marsh Fork students due to their proximity to an active strip mine, such as abnormally high rates of asthma, and worried about the potentially disastrous consequences of any stresses or failures in the earthen dam retaining the slurry. The nearby mine and processing plant were owned and operated at the time by Massey Energy, one of the most controversial coal companies in the region. It was led by Don Blankenship, an outspoken and active opponent of labor unions and environmental regulations. Both Blankenship and his company were frequent targets for environmentalist outrage, and for his part, Blankenship seldom passed an opportunity to denounce “tree huggers” and others who, so he claimed, would destroy the jobs of hard-working Appalachian miners. In 2012 a new elementary school was built several miles from the original site, thanks to donations and ongoing political pressure; but in June 2009 these issues remained unsettled....

scholarly journals Efekty restrukturyzacji górnictwa węgla kamiennego w Polsce

2006 ◽  
Vol 9 ◽  
pp. 28-39
Author(s):  
Maria Tkocz
Keyword(s):  
Coal Mining ◽  
Free Market ◽  
Coal Mines ◽  
Hard Coal ◽  
Coal Production ◽  
Free Market Economy ◽  
Organisational Structure ◽  
Coal Basin ◽  
Hard Coal Mining ◽  
Production Capacities

This paper presents changes in the functioning of hard coal mining in Poland in the period of development of free market economy, i.e. after 1989. During this period some attempts were made to bring the coal mining to remunerativeness. Five programmes of coal mining restructuring were implemented. Their main aim was the reduction of excessive production capacities. 23 coal mains were closed down in the period 1989–2003, especially in the northern and eastern parts of the coal basin, which include the areas where coal exploitation was the longest and coal resources are located under considerably urbanised areas, often within safety pillars (Bytom, Chorzów, Gliwice, Zabrze, Będzin, Dąbrowa Górnicza, Sosnowiec). As a consequence, coal production fell from 177.4 million tonnes to 100.5 million tonnes and the employment decreased from 415.7 thousand to 135.7 thousand. An organisational structure is represented by three coal syndicates: Katowice Capital Group with 8 coal mines, Coal Campaign with 23 coal mines and Jastrzębie Coal Company with 5 coal mines.

scholarly journals ANALYSIS OF WORK EFFICIENCY IN HARD COAL MINING IN POLAND

2018 ◽  
Vol 6 ◽  
pp. 417-423
Author(s):  
Aurelia Rybak ◽  
Ewelina Włodarczyk
Keyword(s):  
Coal Mining ◽  
Production Efficiency ◽  
Labour Productivity ◽  
Mining Industry ◽  
Hard Coal ◽  
Production Volume ◽  
Total Production ◽  
Efficiency Coefficient ◽  
Work Efficiency ◽  
Hard Coal Mining

Motivation: This article presents the analysis of work efficiency in hard coal mining in Poland. Labour costs in Polish mining enterprises account for over 40% of the total production cost. For this reason, the labour productivity of employees has a key impact on the final operating profit.Problem statement: In the case of Polish coal companies, the efficiency is the index value of which particular restructuration programs have attempted to increase for years. However, because of the effect of overstaffing and a decrease in hard coal exploitation, the task was impossible.Approach and results: In this article the effects of the latest recovery programme have been presented, the production efficiency index has been determined; the rate of changes in production volume has been presented as well as the employment figure and the average salary in the Polish mining industry in the recent decade.  Moreover, the prognosis of the employment figure using the ARIMA and ARMAX class model was conducted.Conclusions: It should be noted that in the last four years a significant reduction in the employment figure has been onserved in the hard coal mining industry. This figure has been adjusted to the production volume level.  This, in turn, has positively influenced the work efficiency coefficient level.

Sign in / Sign up

Export Citation Format

Share Document