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Apr 01, 2009#0183;#32;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
The powder factor is closely related with the efficient blasting [2]. Higher energy explosives, such as those containing large amounts of aluminum powder, higher density can break more rock per
Aug 07, 2014#0183;#32;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. Powder Factor The quantity of explosive required to fragment 1 m3 or 1 tonne of rock is known as powder factor [2].
A review of breakage and fragmentation modelling literature has shown that only a few The first stage of the comminution process in metalliferous mining is the breakage and frameworks, with design variables that are familiar to the mine blast engineer ( powder factor, burden and spacing), making them easy to implement in simple
Nov 29, 2013#0183;#32;One of the most critical parameters in the determination of optimal blasting conditions is the powder factor. Accurate prediction of the powder factor reduces the costs incurred through trialanderror blasting. Previous research to establish the initial powder factor has focused on relations between rock mass properties, blasting material and blasting geometry and has resulted in a number of
mining activity and widespread illegal artisanal mining activity. They are also geographically and culturally different regions of Ghana, which provided access to a wider range of informative perspectives. The research involved a review of published documents, grey literature and secondary
Jan 01, 2015#0183;#32;In this light, the present study was conducted in opencast phosphate mines to see the effect of Schmidt hammer rebound number or transformed compressive strength of rocks on the powder factor. The correlation was found sufficiently reliable to enable the determination of an optimum powder factor for surface bench blast in different rock types
Apr 01, 2016#0183;#32;Powder factor is the ratio between the amount of rock broken and total weight of explosive consumed. It is an important parameter in blast design and has a vital influence on the resultant fragmentation. Higher powder factor causes oversize and lower powder factor results in
Solar Mining Services application is a realtime guide to working with Solar Mining Services products. Features include: Real time Blast Calculators for calculating: Mass Per Metre Mass Above Grade Actual Powder Factor Technical Powder Factor PPV Mass Per Hole Number of Holes Total Explosives Needed Volume To Be Blasted Burden Spacing Fragmentation Rules of Thumb for quick reference
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[Show full abstract] blastholes, lowering total charging cost by US20/hole (15% decrease) and the powder factor to an average of kg/m3 (12% decrease). Blast results were 443,624 t of
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 calculation of the burden.
Powder factor is the mass of explosive required to break one cubic meter of insitu rock and expressed in FACTORS AFFECTING BLASTING PERFORMANCE Geology of an area Physical rock properties, rock hardness and rock structure . Controllable and uncontrollable factor Drilling pattern Physical selection parameter Explosive Powder factor Delay time GEOLOGY OF AN AREA The geology of
adopted by the mining industry to compare the explosive costs and achieve better blasting results and. The model developed is a user friendly one, since by keeping the powder factor and number of choices of explosives available as constant and by varying the parameters like
Aug 20, 2016#0183;#32;Powder factor : The powder factor for a particular mine is fixed as to give a continuous product size and also avoiding the oversize and under sized product. Cost of explosive : This is a parameter where the value depends on the explosive strength and type of the explosive used.
Journal of Powder Metallurgy amp; Mining is an Open Access journal and aims to publish most complete and reliable source of information on the discoveries and current developments in the mode of original articles, review articles, case reports, short communications, etc. in all areas of the field and making them freely available through online
A review summary of the extensive literature survey conducted to know about one such environmental friendly concrete named geopolymer concrete is presented in this paper. It is found to be an excellent alternative construction material to the concrete produced using Ordinary Portland Cement.
Extractive metallurgy is the practice of removing valuable metals from an ore and refining the extracted raw metals into a purer form.. Related Journals for Extractive Metallurgy Powder Metallurgy amp; Mining, Mineral Processing and Extractive Metallurgy Review, Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy, Minerals Engineering
Powder Factor = Tons of rock (or cubic yards) per pounds of explosive. Normal range = 4 to 7 Shallow holes = 1 to 2 External loads = .3 Tons of Rock = Powder Factor lbs of Explosives The higher the powder factor, the lighter the load. Lower powder factor means more explosives. Example: tons = PF of BURDENSPACING CALCULATION From Powder Factor of 1 lb./ 1. Determine
The correlation was found sufficiently reliable to enable the determination of an optimum powder factor for surface bench blast in different rock types, maintaining the required blasting results
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
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