Apr 01, 2016· 1. Introduction. Rock fragmentation distribution influences a range of mining and milling processes including load and haul rates, crushing and grinding performance and ore recovery in beneficiation processes (Michaud et al., 1997).In opencast mining, where blasting is employed for excavation, the overall cost effectiveness of the production operations is compatible with optimization .
The use of Powder Factor in blast design The Powder Factor can be used to design the distribution of explosives in the rock mass that is to be blasted. The critical dimension is the burden distance which is the shortest distance to stress relieve when a shothole .
Powder Factor In Blasting Lime Stone Mining India. Process Of Drilling And Blasting In Mines At India. mining process drilling blasting iron ore,16 Aug 2013,The mpl is Read more production of lime stone powder Newest Crusher, Grinding. get price
Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road result of rock blasting is often known as a rock cut.. Drilling and blasting currently utilizes many different varieties of ...
Powder Factor is defined as the amount of explosive required to dislodge and fragment 1 cubic yard of rock. [3] The softer (less dense) the material that is being blasted; the smaller the powder factor. ... After calculating the BI for a blasting area, we can determine the needed powder factor from an empirical chart. [4] Example: For a ...
coal, limestone, metallic ores, etc. Stone quarries in Indian context suggest very different operational experience due to numerous factors, small area under mining lease, lower bench height, vicinity to residential and other structures, higher degree of segregation of oversized boulders required after blasting, and heterogeneous geology, to
Powder factor = per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth Blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock) Burden = x Spacing Fire as many holes as possible on one delay. Stem holes. Powder factors Typical powder factors
Rock Fragmentation by Blasting – a review The rock fragmentation process in mining currently being practiced in India needs reexamination to improve the productivity of the mine.
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Changes in blast parameters show results in that cost reduced to Rs /t with powder factor improved to t/kg, drilling factor of t/m and tonnage per hole increased to 1443 t(per hole getting 68 t more). showed improvement as compared with the previous blast design.
( billion pounds) was used by the mining industry [USGS, 2004]. Blasting is a great tool in fragmenting and loosening rock and other materials for easier handling and removal by mining equipment. However, blasting creates serious concerns for the mine operators and miners in terms of blast area security.
Effect of Stemming to Burden Ratio and Powder Factor on Blast Induced Rock Fragmentation– A Case Study SANDEEP PRASADa*, CHOUDHARYb and MISHRAc aResearch Scholar, Department of Mining Engineering, IIT (ISM) Dhanbad, India bAssistant Professor, Department of Mining Engineering, IIT (ISM) Dhanbad, India
Optimization of blast is dependent on a host of complex factors related to the rock, explosive, initiation, drillhole parameters and their layout. The present work is a step in the direction of developing a suitable blast model, with simple methodologies which can be adapted by the mining industry to achieve better blasting .
Dept. of Mining Engg. Indian School of Mines, Dhanbad – 826 004, India Email: kausdey Abstract 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
Check the availability of the blasting shelter, your blasting equipment, the face, the drill pattern, exposure within and around the blast area, and the availability of adequate stemming. Diagram. Diagram the shot as drilled and delay timings. Measure. Measure the burden, spacing and depth, noting any deviations. Calculate. Calculate the powder ...
Powder factor or specific charge or blasting ratio: This is the ratio between the mass of explosives required to break a given quantity of rock and is normally expressed in kg/m3 or kg/t3. Table 1 is a guide to the powder factor for a given type of explosive in various types of rock.
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Presplit blasting Spacing = Hole diameter x 12 Burden = x production blast burden (B) Uncharged length at top = 10 x D Powder factor = per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock)
The actual mine data in respect of different mining parameters was collected and a time motion study was carried out. Data analysis for a few important parameters is summarized below: Situation Analysis Blasting : The powder factor is found to be highly variable. Drilling : The yield per m is found to be low and there is 40% spare drilling ...
Mining cost is governed by various sub activities, viz. drilling, blasting, excavation, study carried out for a limestone mine in central India is presented. 1. . the cost saving that could be derived after their implementation has been calculated.
Powder Factor In Blasting Lime Stone Mining India. good blasting practices limestone mining stone crusher ... good blasting practices limestone mining. good blasting practices limestone mining. ... Pit Quarry connects with Larry Mirabelli, senior manager at Buckley Powder Co., to discuss best drilling and blasting practices. Larry Mirabelli ...
Jul 16, 2018· A baseline for powder factor or a standard number typically is one pound of explosives per cubic yard of rock. This would be a powder factor of one. We use powder factor to measure pounds per yard to achieve specific results from the blast.
powder factor in blasting lime stone mining india; Blasting mechanics: Material properties and powder factor. Apr 17, 2019· Powder factor is the amount of explosive (pounds) to the total amount of rock blasted (tons) to develop a scale which some use to develop a blast design.
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