European Type Jaw Crusher

European Type Jaw Crusher is a new crushing machine, the jaw crusher manufacturer, after the release of traditional jaw crusher. This jaw crusher is a perfect combination of modern science and technology and the production practice, which can better satisfy the automatic production demands of vast customers.

Input Size: 0-930mm
Capacity: 12-650TPH

Materials:
Granite, marble, basalt, limestone, quartz, pebble, copper ore, iron ore.

VSI6X Series Vertical Crusher

Due to the increasing market demand for the scale, intensification, energy conservation, environment protection and high-quality machine-made sand, a Chinese professional sand maker manufacturer, further optimizes the structure and function of traditional vertical-shaft impact crushers and launches a new generation of sand-making and reshaping machine with high efficiency and low costs --- VSI6X Series Vertical Crusher.

Input Size: 0-50mm
Capacity: 100-583TPH

Materials:
Granite, quartz, basalt, pebble, limestone, dolomite, etc.

LM Vertical Mill

High drying efficiency, Low running cost, Good environmental effect

LM Vertical Mill integrates crushing, drying, grinding, classifying and conveying together, and it is specialized in processing non-metallic minerals, pulverized coal and slag. Its coverage area is reduced by 50% compared with ball mill, and the energy consumption is saved by 30%-40% similarly.

Applications: Cement, coal, power plant desulfurization, metallurgy, chemical industry, non-metallic mineral, construction material, ceramics.

MTW Trapezium Mill

Large capacity, Low consumption, Environmental friendly

MTW European Trapezium Mill has a large market share in the grinding industry. Whether bevel gear overall drive, inner automatic thin-oil lubricating system or arc air channel, these proprietary technologies makes machine advanced, humanized and green.

Applications: Cement, coal , power plant desulfurization, metallurgy, chemical industry, non-metallic mineral, construction material, ceramics.

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Little abrasion wear, Long service life

Based on 30 years of development experience of grinding equipment, LM Heavy Industry produced LUM Series Superfine Vertical Roller Grinding Mill to make ultra-fine powder. The grinding roller doesn't contact with millstone usually, which makes abrasion little and service life longer.

Applications: Superfine dry powder of none-metal ores such as calcite, marble, limestone, coarse whiting, talc, barite and dolomite and so on.

mine bench height for blasting

Selection of practical bench height in open pit mining

2015-9-9  Dilution versus bench height (Bozorgebrahimi et al., 2005). Figure 3. Large block of the simple sequencing method. In open pit mining, factors that can affect the degree of dilution can be regarded as deposit-related or mine-related. The bench height is a mine-related parameter that can be studied using a simple geometrical model of

Influences of bench height of an open-pit coal mine

Heidaigou open-pit coal mine was chosen as an example to explore the influences of bench height on cast blasting in open-pit coal mines. Theoretical analyses and site tests were carried out

Effects of Rock Mass Conditions and Blasting Standard on

2015-5-18  General blasting standard of each mine. Mine A Face 1 Mine A Face 2 Mine A Face 3 Mine A Face 4 Mine B Face 1 Mine B Face 2 Mine C Face 3 Mine D Face 1-3 Bench height (m) 10 15 13 15 15 15 10 10 Bench angle(deg.) 70 70 70 70 70 70 70 70 Hole spacing (m) 4.0 3.8 4.0 4.0 5.5 6.0 5.0 2.0

Research of the Influence of Bench Height on Open Mine

In this paper the influence of bench height on open mine bench blasting was studied by model test in laboratory. The results indicated that the bench height shall be increased from 12 meters to 15 or 20 meters. The effect of blasting shall be improved, and the

Improved Blasting and Bench Slope Design at the Aitik Mine

2016-9-30  Improved Blasting and Bench Slope Design at the Aitik Mine P-I. Marklund Boliden Mineral AB, Sweden J. Sjöberg Vattenfall Power Consultant AB, Sweden F. Ouchterlony Swebrec at Luleå University of Technology, Sweden N. Nilsson Nitro Consult AB, Sweden Abstract The Aitik open pit mine, located in northern Sweden, currently faces a substantial production increase,

Economic evaluation of optimum bench height in quarries

2009-8-26  bench height has been found to be 15 m. At the same time, the blast unit cost has been seen to diminish as the hole diameter grows. As the bench height goes up, unit cost appears to drop; however, for 20 m of bench height, because of the increase in priming, the unit cost tends to build up increase. Loading and transportation

Design the blast in low benches and some practical

2017-11-19  Low bench blasting: H/B < 2 or the charge length l < 1.3 B (for vertical borehole) 1. Introduction B B 0.3B H l H = Bench height B = Burden l = Charge length Low bench blasting? The stiffness ratio H/B 2, the blast should be redesiged (Ash (1977), Konya (1991).

Blaster's Training Modules Module 4 Blasthole Drilling

2008-5-22  Bench Height feet 3 3.5 4 4.5 5 5.5 6 6.25 6.5 6.75 7 7.88 9 9.88 10.6 12.3 13 15 16 3 7 10 13 16 20 23 26 30 33 36 39 43 46 49 52 56 59 62 66 69 72 75 79 82 Hole Diameter in Inches A common method for calculating this relationship is: d (inches) < H/5 (in feet). Thus, for example, the maximum recommended drill-hole diameter for a mine that

CODE OF PRACTICE

2018-3-8  The bench height is designed by the mine planner. The main constraint on height of bench is blasting on a mine/quarry site. Blast Area The area where blastholes are to be charged and fired, and within which access will be . Australian Explosives Industry and

6.3.1: Bench Blasting ABC 123: Testing Site / Course

6.3.1: Bench Blasting. Here is a sketch of a bench, showing a few boreholes, and the design variables. This bench could be in an underground or surface mine. Our goal will be to calculate values for many of the parameters shown on this diagram.

Selection of practical bench height in open pit mining

2015-9-9  Dilution versus bench height (Bozorgebrahimi et al., 2005). Figure 3. Large block of the simple sequencing method. In open pit mining, factors that can affect the degree of dilution can be regarded as deposit-related or mine-related. The bench height is a mine-related parameter that can be studied using a simple geometrical model of

Influences of bench height of an open-pit coal mine

Heidaigou open-pit coal mine was chosen as an example to explore the influences of bench height on cast blasting in open-pit coal mines. Theoretical analyses and site tests were carried out

Economic evaluation of optimum bench height in quarries

2009-8-26  bench height has been found to be 15 m. At the same time, the blast unit cost has been seen to diminish as the hole diameter grows. As the bench height goes up, unit cost appears to drop; however, for 20 m of bench height, because of the increase in priming, the unit cost tends to build up increase. Loading and transportation

big bench blasting in mining operations

2 天前  big bench blasting in mining operations. Some other researchers made attempts to optimize drilling and blasting operations from the technical point of view Sontamino and Drebenstedt addressed a dynamic model for a bench blasting design Bowa introduced a practical method in an open pit mine to optimize blasting design parameters such as bench height drill hole diameter spacing

Improved Blasting and Bench Slope Design at the Aitik Mine

2016-9-30  Improved Blasting and Bench Slope Design at the Aitik Mine P-I. Marklund Boliden Mineral AB, Sweden J. Sjöberg Vattenfall Power Consultant AB, Sweden F. Ouchterlony Swebrec at Luleå University of Technology, Sweden N. Nilsson Nitro Consult AB, Sweden Abstract The Aitik open pit mine, located in northern Sweden, currently faces a substantial production increase,

Effects of Rock Mass Conditions and Blasting Standard on

2015-5-18  General blasting standard of each mine. Mine A Face 1 Mine A Face 2 Mine A Face 3 Mine A Face 4 Mine B Face 1 Mine B Face 2 Mine C Face 3 Mine D Face 1-3 Bench height (m) 10 15 13 15 15 15 10 10 Bench angle(deg.) 70 70 70 70 70 70 70 70 Hole spacing (m) 4.0 3.8 4.0 4.0 5.5 6.0 5.0 2.0

CODE OF PRACTICE

2018-3-8  The bench height is designed by the mine planner. The main constraint on height of bench is blasting on a mine/quarry site. Blast Area The area where blastholes are to be charged and fired, and within which access will be . Australian Explosives Industry and

6.3.1: Bench Blasting ABC 123: Testing Site / Course

6.3.1: Bench Blasting. Here is a sketch of a bench, showing a few boreholes, and the design variables. This bench could be in an underground or surface mine. Our goal will be to calculate values for many of the parameters shown on this diagram.

DETERMINATION OF SOME BENCH BLAST PARAMETERS

2016-5-24  2.1 BLASTING Bench blast is blasting a series of blastholes which may be vertical or inclined towards a free face. Blasting in overburden is done to fragment and shatter the rock and to displace the rock in mine area by casting the overburden. In coal and ore it is done to achieve the fragmentation.

DESIGN OF SURFACE BLASTS- A COMPUTATIONAL

2009-4-30  9 Relationship of bench height, stemming with diameter & UCS of rock for large blast hole 44 10 Relationship of sub drilling with blast hole diameter for large blast hole 44 11 List of burden and spacing values for various compressive rock strengths and explosives. 45

ASK MINING: Blasting Practices at Open Cast Mines

2012-3-2  2. Bench Height: This depends on the excavator employed in the operation i.e. Shovel (4.6m3, 6m3, 8m3): 10-12m; Dragline (24m3/ 96m): 30m; 3. Blast Hole Diameter: Up to bench height of 8m, 100mm,, 150mm, 163mm of blast hole diameter is preferred but for bench height > 8m, a minimum of 250mm diameter of blast hole is efficient. 4.

CODE OF PRACTICE

2018-3-8  The bench height is designed by the mine planner. The main constraint on height of bench is blasting on a mine/quarry site. Blast Area The area where blastholes are to be charged and fired, and within which access will be . Australian Explosives Industry and

Effects of Rock Mass Conditions and Blasting Standard on

2015-5-18  General blasting standard of each mine. Mine A Face 1 Mine A Face 2 Mine A Face 3 Mine A Face 4 Mine B Face 1 Mine B Face 2 Mine C Face 3 Mine D Face 1-3 Bench height (m) 10 15 13 15 15 15 10 10 Bench angle(deg.) 70 70 70 70 70 70 70 70 Hole spacing (m) 4.0 3.8 4.0 4.0 5.5 6.0 5.0 2.0

Improved Blasting and Bench Slope Design at the Aitik Mine

2016-9-30  Improved Blasting and Bench Slope Design at the Aitik Mine P-I. Marklund Boliden Mineral AB, Sweden J. Sjöberg Vattenfall Power Consultant AB, Sweden F. Ouchterlony Swebrec at Luleå University of Technology, Sweden N. Nilsson Nitro Consult AB, Sweden Abstract The Aitik open pit mine, located in northern Sweden, currently faces a substantial production increase,

Blaster's Training Modules Module 4 Blasthole Drilling

2008-5-22  Bench Height feet 3 3.5 4 4.5 5 5.5 6 6.25 6.5 6.75 7 7.88 9 9.88 10.6 12.3 13 15 16 3 7 10 13 16 20 23 26 30 33 36 39 43 46 49 52 56 59 62 66 69 72 75 79 82 Hole Diameter in Inches A common method for calculating this relationship is: d (inches) < H/5 (in feet). Thus, for example, the maximum recommended drill-hole diameter for a mine that

DETERMINATION OF SOME BENCH BLAST PARAMETERS

2016-5-24  2.1 BLASTING Bench blast is blasting a series of blastholes which may be vertical or inclined towards a free face. Blasting in overburden is done to fragment and shatter the rock and to displace the rock in mine area by casting the overburden. In coal and ore it is done to achieve the fragmentation.

Paper: Improved Blasting and Bench Slope Design at

Abstract: The Aitik open pit mine, located in northern Sweden, currently faces a substantial production increase, which has necessitated a review and update of design guidelines. This work pointed at the possibility of increasing interramp slope angles a few degrees, which, in turn, requires an improved bench slope design, most notably blasting techniques.

DESIGN OF SURFACE BLASTS- A COMPUTATIONAL

2009-4-30  9 Relationship of bench height, stemming with diameter & UCS of rock for large blast hole 44 10 Relationship of sub drilling with blast hole diameter for large blast hole 44 11 List of burden and spacing values for various compressive rock strengths and explosives. 45

Prediction of Rock Size Distribution in Mine Bench

Using an image processing technique, the Split-Desktop software package was used to analyze the RSD of 136 blasting events at a quarry in Vietnam. Results were used as inputs, such as powder factor, explosive charge per delay, bench height, stemming length, and

Blast design in opencast mining SlideShare

2017-10-12  Blasting parameters Burden- the shortest distance between two holes perpendicular to the face. It should be adequate. In practice, burden = ½ to 1/3 of bench height. Spacing- distance between two consecutive holes in a row parallel to face. It should

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