- +8615978832153
- من الإثنين إلى السبت: 10:00 - 16:00 / يوم الأحد مغلق
Flyrock distance increases with the increase in hole depth/ hole length. The parameters related to the explosives used are powder factor, maximum charge per delay and specific charge. Maximum charge per delay and powder factor as input parameters have been …
أكمل القراءة
Global Mine Productivity Issues: A Review. Jairo Ndhlovu1, Peter R K Chileshe2. 1,2Copperbelt University. 1Mopani Copper Mines plc Kitwe Mine Site. Abstract:- Global mine productivity issues are of high importance in mining industry and thus, every single effort must be put in place at every mining stage if continuity flow of ore and profitability is to be achieved.
أكمل القراءة
View Rajesh Raitani, MS, MBA'S profile on LinkedIn, the world's largest professional community. Rajesh has 9 jobs listed on their profile. See the complete profile on LinkedIn and discover ...
أكمل القراءة
Abstract. A literature review of empirical methods for the calculation of the specific charge for bench blasting in surface mines is presented. These methods are based on seismic wave velocity, drilling indices, the efficiency of transferring explosive …
أكمل القراءة
This review details the state of the art in research on top coal drawing mechanisms in Longwall top coal caving (LTCC) by examining the relevant literature over the last two decades. It starts with an introduction of the brief history and basic procedures of LTCC. The framework of research on the drawing mechanism, basic concepts, and some theoretical models of LTCC are detailed in sect ...
أكمل القراءة
A NOVEL POWDER FACTOR BASED BENCH BLAST DESIGN METHOD FOR LARGE SURFACE COAL MINES by ANDREW CLIFFORD BLAIR A DISSERTATION Presented to the Graduate Faculty of the MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY in MINING ENGINEERING 2015 …
أكمل القراءة
The literature review indicates that the angle of repose has been used in different fields, such as agriculture (for the design of silos and hoppers), pharmacology (in drug production and flowability determination), geology (for the evaluation and monitoring of sand dunes and granular formations), bulk material handling, mining, civil ...
أكمل القراءة
Rocks with voids sometimes require large powder factors. For most typical tunnel blasting, the powder factor varies between 0.6 and 5 kg/m³. The powder factor can vary from 1 kg/m in a tunnel with an opening size greater than 30m² to more than 3 kg/m³ for a …
أكمل القراءة
the shovels is affected by powder factor. The cost of shovel teeth plus wear materials on buckets improves with higher powder expenditures.(fig. 7) The effect on the primary crusher is to increase through-put as powder factor rises.(fig. 8) The last step in tracking powder factor is in the secondary and tertiary grinding and in milling.
أكمل القراءة
The powder factor is defined as the quantity of explosive used per unit of rock blasted. This affects what the hole size, burden and spacing that will be used. These parameters can be preselected based on knowledge of the desired production rate of the stope.
أكمل القراءة
• Monitors and review all blast fragmentation, powder factor and wall control, • Formulating and giving charge sheet to the blasting subcontractor, • Advising and selecting mining subcontractors (drilling & blasting) • Strategic planning to ensure annual and rolling mining schedules adhere to LOM objectives,
أكمل القراءة
(x) Powder Factor q =Q/V where Q is the total quantity of explosive per borehole and V is the total volume of rock blasted. b- Physicochemical or pertaining to explosives: Types of explosives ...
أكمل القراءة
For this, a literature review of application of AI to the field of rock mechanics is presented. ... hole diameter, hole depth, powder factor, and explosive properties which have not been considered in the models. The AI approach, most specifically ANN, has also been used ... Rockburst is a major issue of concern in mining engineering and rock ...
أكمل القراءة
Blasting has an important impact on mining and milling well beyond the necessary ability to dig and load the ore efficiently. There is an increasing body of blasting research indicating significant impacts in crushing and grinding. These include increased production through higher output and fewer delays for bridging and jamming by oversize. In addition, fragmentation better suited to the ...
أكمل القراءة
The powder factor for stope ranges between 0.3kg/tonne to 0.45 kg/tonne. Inaccurate drilling coupled with poor charging practices are one of the main cause of low recovery and high unplanned dilution at the mine. Stope Sequencing. The mining sequence used at Number 4 shaft is top to bottom with permanent pillars and no backfill.
أكمل القراءة
budgeting powder factor. Blair [25] has observed that many mines use the average powder to project their explosives budget forecast and financial planning, and yet the powder factor is not used as an input parameter to blast design. Consequently, Blair [25] has proposed a blast design model that includes powder factor and cut width in the ...
أكمل القراءة
Rock fragmentation in mining and construction industries is widely achieved using drilling and blasting technique. The technique remains the most effective and efficient means of breaking down rock mass into smaller pieces. However, apart from its intended purpose of rock breakage, throw, and heave, blasting operations generate adverse impacts, such as ground vibration, airblast, flyrock ...
أكمل القراءة
- Maximum powder factor was 1.05 lbs/yd. 3. - Distance to the nearest residential structure was over 2000 feet. - Two of the five blasts triggered the blasting seismograph at Post 2013. The maximum PPV was 0.04 in/s and airblast was 111.8 dB. Figure 2 shows a waveform or time history of the event. The waveform is representative of a blast and the
أكمل القراءة
into powder form due to the cutting of marble. The growing rate of marble consumption is resulting in more and more production of marble dust. At present, the mining industry in Rajasthan is producing 4500 tons (1800 m³) per year. A large proportion of this huge production becomes waste and a large area of land is required to store this.
أكمل القراءة
Powder factor is expressed in many different forms. Essentially it is a measurement of explosives per quantity of rock. The typical variation of this that we use on a daily basis is how many pounds of explosives per cubic yard of rock. This gives us a baseline of how we need to go about fragmenting rock for each particular application.
أكمل القراءة
iii Acknowledgements This research was accomplished with the financial support of the Centre for Excellence in Mining Innovation (CEMI). I would like to sincerely thank my supervisor, Dr. P.D. Katsabanis, for the guidance he has provided over
أكمل القراءة
Powder factor can be defined as the quantity of explosives (kg) required to break a unit volume or tonne (t) of rock. The prospect of excavating rocks by blasting is characterized by a specific consumption of explosives. In the past decades, researchers have come up with several precise approaches to predict powder factor or specific charge in blast operations other than through trial blast.
أكمل القراءة
displace a given volume of rock (powder factor). The burden-to-charge diameter ratio varies with rock density, changing the powder factor. The average burden-to-charge diameter ratio of 25 to 30 is for average density rocks similar to the typical rocks listed in table 19-1. Denser rocks such as basalt require smaller ratios (higher powder factors).
أكمل القراءة
A review of the same has been aimed in this paper and establishes a relationship between powder factor and uniaxial compressive strength (UCS) of the rock which was obtained through rebound number. 1.1 Powder Factor The quantity of explosive required to fragment 1 m3 or 1 tonne of rock is known as powder factor [2].
أكمل القراءة
In surface mining operations, the weight of explosive used per unit volume of rock blasted is measured in pounds per cubic yard) lb/yd 3) (kg/m 3) to produce broken material is defined as powder factor.However, in underground mining operations the preference is to define powder factor as the weight of explosive required per unit of weight of rock to fragment either a metric tonne or an ...
أكمل القراءة
This paper presents a review of measurement while drilling (MWD) technology as applied to the mining industry, describes its development path, provides a global review of literature on this topic, and outlines further trends of development for research on MWD application in drilling and blasting (D&B) operations at mining enterprises. The current review serves as a starting point for anyone ...
أكمل القراءة
2. Literature Review 2.1 Tunnels Underground tunnels in early days are used especially in mining. Tunneling and mining are together since beginning of the industry. Before mining, tunnels in ancient history were used for water carriage. In cities such View metadata, citation and similar papers at core.ac.uk brought to you by CORE
أكمل القراءة
Literature review After a century of operation, the world's largest open pit mine will reach its profitable limit by the end of this decade. At over 1100 m in depth and 4.5 km in length, the historical Chuquicamata open pit mine will span over 11 km bottom-to-top haulage distance with an …
أكمل القراءة
The main objective of fragmentation by blasting is to achieve the optimum powder factor, which may be defined as the powder factor required for the optimum fragmentation, throw, ground vibration, etc. for a specified blast condition to minimize the overall mining cost. Presently, the powder factor is established through the trial blasts.
أكمل القراءة
Theses and Dissertations--Mining Engineering Mining Engineering 2014 Fragmentation Analysis in the Dynamic Stress Wave Collision Regions in Bench Blasting Catherine E. Johnson University of Kentucky, [email protected] Right click to open a feedback form in a new tab to let us know how this document benefits you. Recommended Citation
أكمل القراءة
Abstract A literature review of empirical methods for the calculation of the specific charge for bench blasting in surface mines is presented. These methods are based on seismic wave velocity, drilling indices, the efficiency of transferring explosive energy, rock mass properties and blasta-bility indices. The parameters considered in these methods are studied and the major factors that ...
أكمل القراءة
[Show full abstract] blastholes, lowering total charging cost by US$20/hole (15% decrease) and the powder factor to an average of 0.86 kg/m3 (12% decrease). Blast results were 443,624 t of blasted ...
أكمل القراءة