Blasting and rock fragmentation - SlideShare

4. - INTRODUCTION • The term 'rock (or blast) fragmentation' is an index that is used to estimate the effect of bench blasting in the mining industry. • it is generally understood that both the stress wave and the gas pressurization make significant contributions to rock fragmentation. 5.

BLAST FRAGMENTATION OPTIMIZATION AT TARKWA GOLD …

Current fragmentation results in sub-optimal feed size to crushers. The defect statement is: Fragmentation less than 95% passing 750mm. The goal statement is: To improve fragmentation in order to achieve a constant throughput of 1500 t/hr to CR02 consistently, a 5% increase in Mining efficiency, a 50% decrease in rock breaker

Understanding the impact of geotechnical ore properties ...

A method for estimating the crusher model parameters based on Axb value was introduced. Abstract. In hard rock mining, blasting is generally the first operation of rock fragmentation from its in-situ state. Therefore, blast design and geotechnical ore properties have a significant impact on downstream processes such as crushing and grinding ...

Stemming plugs improve blasting, productivity - Quarry

Following each blast, the much pile dimensions were documented and an optical fragmentation analysis was conducted throughout the excavation of the shot rock. The primary crusher throughput was also monitored. Previous studies have demonstrated a direct correlation between improved fragmentation and increased productivity.

Rock Fragmentation by Blasting - Orica Mining Services

The fragmentation of rock is fundamental to mining. It is the first preparatory stage in the extraction process – making rock small enough and loose enough to be efficiently excavated. But this simple statement underestimates how important this activity is for the whole mining operation. By optimising rock fragmentation by blasting, you can ...

crusher and hydraulic impact hammer

Impact Crusher VS Hammer Crusher [7 Pics & Hammer crusher is divided into single rotor and double rotor The main body is composed of box, rotor, hammer head, impact lining plate, sieve plate, etc it can directly crush the material with the maximum particle size of 6001800 mm to 25mm or below 2 Crushing Chamber The impact crusher has a large crushing chamber, which makes the

BEST PRACTICES IN DRILL AND BLAST

oversized rock that you can't even get into the primary crusher. So they have to go back in and use an impact hammer, or they have to blast it again to break it into smaller pieces." – R Frank Chiappetta, Explosives Applications Engineer and President of Blasting Analysis International. FRAGMENTATION DILUTION THROW MUCK PILE PROFILE NOISE

Blog: Three reasons why your primary crusher feed contains ...

However, mining operations frequently have issues related to the primary crusher: low throughput, low utilization and high wear rate of liners. Changes in fragmentation and breakage ...

[PDF] IMPACT OF PHYSICAL AND MECHANICAL PROPERTIES OF ...

The aim of this paper was to determine the impact of physical and mechanical properties of rocks on the electricity consumption of a jaw crusher during crushing. This paper presents a different approach to determine the energy consumption during comminution. The energy required for crushing rocks was obtained by direct measurement of crusher's motor power during the crushing of samples.

IMPACT OF ROCK HARDNESS ON FRAGMENTATION BY …

The physical and mechanical characteristics of intact rocks depend on the way of their formation, sustained deformations and the process of wearing a specific rock has been exposed to. These characteristics have a rather high influence...

Blast fragmentation measurements in open pits ...

"Further rock fragmentation measurement located on the crusher discharge conveyor offers advantages and presents different but important data. Firstly, installation on a fixed conveyor is simpler and more reliable than applications in the pit or at the crusher, secondly the crushed ore PSD is a more critical measurement particularly to AG and ...

effects of fragmentation on the crusher

Impact Of Rock Fragmentation On Crusher. Rock fragmentation and crushing equipment impact crusher is suitable for materials whose compressive strength is under mpa and particle size is less than mm ball mill machine is widely used to process cement silicate product building material refractory material fertilizer ceramics and.

Impact Of Rock Fragmentation On Crusher-Crusher

The rock blocks extracted by blasting which are larger than the opening of the primary crusher are usually fragmented by hydraulic hammer the paper presents the results of the testing of impact of rock hardness on fragmentation of rocks by means of hydraulic hammer and during crushing in …

Powder Factor Selection for Improved Rock …

better fragmentation to be obtained at CUT 4 A-Zone pit, powder factor of 0.88 could be used. Keywords: Fragmentation analysis, loading and hauling, shovel loading time and cost estimated. 1 Introduction . Rock breakage is an essential part of the mining cycle and in hard rock, this is effected by drilling and blasting.

(PDF) Impact of physical and mechanical properties of ...

Kujundzic T., Bedekovic G., K uhinek D., Korm an T., 2008, Impact of rock hardness on fragmentation by hydraulic hammer and crushing in jaw crusher, The Mining-Geological-Petroleum Engineering ...

A system-wide approach to minimize the operational cost of ...

Ouchterlony F, Sanchidrián JA, Moser P (2017) Percentile fragment size predictions for blasted rock and the fragmentation-energy fan. Rock Mech Rock Eng 50(4):751–779. Article Google Scholar Pothina R, Kecojevic V, Klima MS, Komljenovic D (2007) Gyratory crusher model and impact parameters related to energy consumption.

Rock fragmentation control in opencast blasting ...

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 …

Impact Crushing vs. Cone; The Effect on Aggregate LA ...

The main influence on the Si index is from the material itself, however the impact crushing action causes the material to fragment along natural …

Rock Fragmentation by Blasting

The fragmentation of rock is fundamental to mining. It is the first preparatory stage in the extraction process – making rock small enough and loose enough to be efficiently excavated. But this simple statement underestimates how important this activity is for the whole mining operation. By optimising rock fragmentation by blasting, you can ...

Prediction of rock fragmentation using the Kuznetsov ...

crushing processes (Ouchterlony, 2003). Accurate measurement of blasted rock fragmentation is of great importance in hard rock drilling and blasting (Fourney and Dick, 1996). The post-blast rock size distribution dramatically influences the efficiency of all the …

Crushers - All crusher types for your reduction needs ...

Primary crushing with impact crushers. The primary impact crusher offers high capacity and is designed to accept large feed sizes. The primary impact crushers are used to process from 200 t/h up to 1900 t/h and feed sizes of up to 1830 mm (71") in the largest model. Primary impact crushers are generally used in nonabrasive applications and ...

IMPACT OF ROCK HARDNESS ON FRAGMENTATION BY …

impact of rock hardness on fragmentation by hydraulic hammer and crushing in jaw crusher utjecaj tvrdoĆe stijene na usitnjavanje hidrauliČnim ČekiĆem i na drobljenje u Čeljusnoj drobilici trpimir kujundŽiĆ 1, gordan bedekoviĆ, dalibor kuhinek 1, tomislav korman 2 1university of zagreb, faculty of mining, geology and petroleum engineering,

Numerical simulation of the dynamic impact breakage ...

1.. IntroductionThe dynamic fragmentation of solid, brittle materials is a fundamental activity that lies at the start of many manufacturing and recovery processes, most notably during crushing in the minerals and aggregates industries, during blasting in quarries and tunnels and in the action of some rock cutting processes .Fragmentation is an important environmental issue as it is both an ...

Impact of electronic blasting detonators on downstream ...

A more uniform rock fragment size distribution is also obtained. The impact of the improved quality blast product on downstream processes of the quarry is a productivity increase of 5% in rock excavation and transportation, an energy reduction of 10% at the primary crusher and an increase of 15% of the primary crusher throughput.

Maximizing profits with fragmentation analysis - Hexagon ...

Fragmentation of rock – making rock small enough and loose enough to be efficiently excavated – is essential to mining and is the preparatory stage in the extraction process. Correct fragmentation means easier digging, reduced shovel cycle times, reduced rework, less oversize causing downtime at the crusher, lower cost crushing, and ...

l image rock crusher

· An impact crusher can be further classified as Horizontal impact crusher (HSI) and vertical shaft impact crusher (VSI) based on the type of arrangement of the impact rotor and shaft. Horizontal shaft impact crusher These break rock by impacting the rock with hammers/blow bars that are fixed upon the outer edge of a spinning rotor.

impact of rock fragmentation on crusher

impact of rock fragmentation on crusher. Impact Of Rock Fragmentation On Crusher. Rock fragmentation and crushing equipment impact crusher is suitable for materials whose compressive strength is under mpa and particle size is less than mm ball mill machine is widely used to process cement silicate product building material refractory material ...

Types of Rock Crushers | Quarry Crushing Equipment | Kemper

Impact Crushers – VSIs and HSIs. Impact-style crushers include VSIs, as well as horizontal shaft impactors (HSIs), and are best used with less abrasive rock types, like limestone. These types of machines break apart material by the impacting forces of certain wear parts known as blow bars and impact plates or toggles.. Some operations also use impact-style crushers after they have already ...

Chapter 8 BLAST DESIGN - NPS

Improved production rates and consequent cost reduction in digging, hauling, crushing, or moving rock are the major benefits obtained from the efficient application of explosive energy. There are other benefits from better fragmentation, such as reduced secondary blasting, reduced power consumption at the crusher, and less

Blast Optimization and Ore Fragmentation Modeling

The influence of blasting doesn't stop at the crusher. Mill productivity, power consumption, and maintenance are a function of the feed. Modelling Blast Fragmentation. The common denominator in all models of fragmentation is the influence …

Impact Crusher Working Principle

Impact Crusher. Buy a small impact crusher: Rock Particle Breakage in Impact Crushing. Rapidly increasing operating costs for minerals beneficiating plants continue to be the biggest single problem in maximizing profitability from these operations. The average world inflation rate has been increasing over the last decade and shows little sign ...

v118n5a12 Particle size distribution and energy ...

fragmentation characteristics of rock. Ovalle. (2014) analysed the effects of particle size on rock aggregate crushing strength, and concluded that strength decreases as particle size decreases. Nikolov (2002, 2004) presented a model for the particle size distribution of material crushed by hammer or VSI crusher, expressed as a function of the

Blast fragmentation measurements in open pits – AMC ...

Further rock fragmentation measurement located on the crusher discharge conveyor offers advantages and presents different but important data. Firstly, installation on a fixed conveyor is simpler and more reliable than applications in the pit or at the crusher, secondly the crushed ore PSD is a more critical measurement particularly to AG and ...

(PDF) Impact of rock hardness on fragmentation by ...

The paper presents the results of the testing of impact of rock hardness on fragmentation of rocks by means of hydraulic hammer and during crushing in jaw …

Impact of rock hardness on fragmentation by hydraulic ...

The rock blocks extracted by blasting which are larger than the opening of the primary crusher are usually fragmented by hydraulic hammer. The paper presents the results of the testing of impact of rock hardness on fragmentation of rocks by means of hydraulic hammer and during crushing in jaw crusher.

Effects of Rock Mass Conditions and Blasting Standard on ...

obvious impact on the size of fragmented rock. It attempts to eliminate this impact from the value of Xp 50 as follows. The distance from the mouth of the hole to the first crack is X 1, that from the first crack and second one is X 2, that from the (n− 1) th and nth ones is X n. Here, t is assumed that a rock mass is fragmented according to i

Evaluation of blast fragmentation effects on jaw crusher ...

Impact crushers apply a high-speed impact force to rock particles using hammers or blow bars. The rate of energy input is much higher causing particles to shatter. Impact crushers can achieve higher reduction ratios than jaws and gyratory's but are limited by high rates of abrasive wear and thus are restricted to somewhat softer rocks ...

Impact Crushers Modelling - SlideShare

Analytical modelling of rock fragmentation in impact crushers An impact crusher fragments the rock by the dynamic strain energy introduced into the feed by the impactor. The process of dynamic fragmentation, by its nature, exploits the existence of flaws and micro-discontinuities. Hence, product fragments tend to be of good quality and shape.

impact crusher digging

impact of rock fragmentation on crusher. Specific items loader cycle times muckpile digging conditions crusher delays and safety Upon conclusion of the Chat Online Importance of Mine Fragmentation on Downstream ResearchGate ROM fragmentation to optimise crushing and grinding performance enhances the compressive strength UCS influence the rock mass blastability and can be Chat Online …

Crushing 101 – Different types of crushers for distinctive ...

Impact crushers are traditionally classified into two main types, horizontal shaft impact (HSI) crushers and vertical shaft impact (VSI) crushers. These different types of impact crushers share the crushing principle, impact, to reduce the material to smaller sizes, but features, capacities and optimal applications are far from each other.

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