Soft Computing Applications for Optimum Rock Fragmentation
Rock fragmentation is an important phenomenon in mining engineering as its outcome determines the productivity of the entire mining process. Its imperativeness in mining engineering has attracted the attention of various researchers towards its assessments and various methods have been developed for this purpose. Hence, this …
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 …
Evaluation of blast efficiency in aggregate quarries: facts and
Ouchterlony F, Nyberg U, Olsson M et al (2015) Effects of specific charge and electronic delay detonators on fragmentation in an aggregate quarry, building fragmentation model design curves. In: 11th International Symposium on Rock Fragmentation by Blasting (FRAGBLAST). Australasian Institute of Mining and …
Effect of Type of Explosive and Blast Hole Diameter on
Rock fragmentation due to blasting depends upon many parameters. The properties of the explosive are one of them. In limestone quarries, ammonium nitrate–fuel oil (ANFO) or site mixed emulsion (SME) are generally used for rock fragmentation. Both these explosives cause substantial changes in the breakage mechanism of rockmass …
(DOC) CSIR-CIMFR | fazal elahi and Pratyay Saha
Fragmentation control through effective blast design and its effect on productivity is a challenging job for the practicing blasting engineer due to inadequate knowledge of actual explosive energy released in the bore hole, effect of varying initiation practice in blast design and its effect on release on the explosive energy.
Evaluation of blast fragmentation effects on jaw crusher …
The fragmentation rate and particle size distribution of the muckpile after blasting have important influences on the performance of subsequent mining activities …
(PDF) Target fragmentation for efficient loading and …
Abstract. Blast-induced fragmentation has a significant influence on the operational efficiency of open pit mines, especially on loading and crushing, the two immediate tasks after blasting. This ...
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 of rock properties and geologic structures within the blast.
v117n11a10 Target fragmentation for efficient loading and
The effects of fragmentation are first seen in loading; no matter what type of machinery is used, fragmentation plays a leading role in loading efficiency. A well-swollen muckpile with a fragmentation tailored to the type and size of the machinery ... crusher's product (Evertsson, 2000; Herbst, Lo, and Flintoff, 2003).
(PDF) Ultrasonic Degradation of DNA
Fragmentation of DNA by ultrasound is the most optimal method of artificial degradation of DNA molecules. It requires no reagents and makes it possible to obtain "pure" DNA samples for further use.
Rock Fragmentation Size Distribution Prediction and Blasting
Rock fragmentation size distribution is often used as an important index to account for the blasting effect because it directly affects the subsequent loading, transportation, and secondary crushing. Due to the mismatching of explosive and rock wave impedance, high boulder yield often occurs which affects the blasting effect. In this …
Influence of jaw crusher parameters on the quality of primary …
This paper presents a parameter study investigating the effect of feed and jaw crusher parameters on the quality of aggregates produced from single-stage crushing. The parameter study is evaluated using mechanical and geometrical tests for aggregate properties. ... (EN 1097-1, 2011), and resistance to fragmentation was measured using …
The effect of rock crusher and rock type on the aggregate shape
The type of crusher and rock may play an important role in aggregate shape characteristics. The aim of this study is to investigate the effect of two types of crusher on the shape characteristics of different rock aggregate. The shape characteristics of aggregate in term of form, angularity and surface texture were evaluated using measured and ...
An Evaluation on the Impact of Ore Fragmented by Blasting …
the fragmentation caused by the effective blasting pattern and its effectiveness on the productivity of rock fragmentation is a challenging task for the blasting engineers [1]. Optimal fragmentation minimizes any negative impact on the mixing (ore and waste) with the maximum integrity of the wall and the floor of the bench.
Effects of Blasting on Crushing and Grinding Efficiency and …
introduced to the primary crusher will affect the feed size distributions throughout the crushing stages. The second effect of blasting, which is "unseen", is the crack generation that occurs within fragments. There is substantial evidence that such cracking occurs. The work by Nielsen and Kristiansen (Fragblast5, 1996) is an excellent example.
Prediction and optimization of flyrock and oversize boulder
During the past decades, there have been several experimental/empirical studies aimed at prediction of the flyrock and fragmentation size induced by blasting (Chung and Katsabanis 2000; Cunningham 1983; KOULLI and Rustan 1993; Kuznetsov 1973; Lundborg et al. 1975; McKenzie 2009; Nie and Rustan 1987).However, due to the …
Evaluation of blast fragmentation effects on jaw crusher …
Overly coarse fragmentation will reduce the primary crusher output. Coarse material will lead to more downtime for clearing crusher bridging and plugging. Poor …
A numerical study of the effects of accurate timing on rock fragmentation
Effects of accurate MS delays on productivity, energy consumption at the primary crusher, oversize, ground vibrations and air blast; M. Sakomoto et al. A study of high accuracy detonator; R.H. Green et al. The effect of precise millisecond delays on fragmentation at the rock of ages quarry; M.S. Stagg et al.
[PDF] The Effects of Blasting on Crushing and Grinding Efficiency …
The Effects of Blasting on Crushing and Grinding Efficiency and Energy Consumption L. Workman, J. Eloranta Published 2003 Engineering, Environmental Science Blasting has …
(PDF) Influence of jaw crusher parameters on the …
Aggregate quality is measured in terms of product gradation, particle shape and mechanical properties. Feed gradation, crusher setting and crusher speed affects the specific energy consumption ...
Target fragmentation for efficient loading and crushing
Published 1 November 2017. Engineering, Environmental Science. Journal of The South African Institute of Mining and Metallurgy. Blast-induced fragmentation has a significant influence on the operational efficiency of open pit mines, especially on loading and crushing, the two immediate tasks after blasting. This study prese….
The Fragmentation Energy-Fan Model in Quarry Blasts
The crusher bypass (< 120 mm) is further separated in a vibratory screen with two decks. From top to bottom, these have circular and square openings of cut sizes 80 and 25 mm, respectively. ... show that the water coupling is able to transmit a high pressure shock to the rock so that the fragmentation effect does not differ much from when the ...
Rock Fragmentation Evaluation towards Blast-To-Mill …
fragmentation on the ROM pad and the impact of rock fragmentation on the performance of the primary crusher. Traditionally, blast performance assessment in …
Predicting the crushability of rocks from the impact strength index
The effect of porosity and density on the correlation was also shown. In addition, multiple regression analysis including porosity and density was carried out. ... Whittles et al. (2006) stated that the common characteristics within all type of crusher is that the fragmentation is induced by uniaxial loading of the particle at high strain rates ...
SciELO
The results show that energy consumption at the primary crusher is a sum of two components: energy directly involved in crushing the rock, and additional energy used for winning the inertial resistances of the moving …
Assessment of the effect of blasthole design parameters on
Crushed stone is the most important raw material for concrete and asphalt production. As a high-volume low-unit-value industry, the crushed stone production sector is highly competitive which implies the necessity to optimise the costs of all of its production operations, i.e. drilling and blasting, secondary breaking, loading, hauling and crushing. …
(PDF) Rock Fragmentation by Blasting – a review
crusher throughpu t and energy consumption, the plant . efficiency, ... However, fragmentation and environmental effects are influenced by the amount of powder factor [21], [22]. A higher amount ...
Reduction of Fragment Size from Mining to Mineral Processing
Regarding such a situation, this article describes the effects of rock fragmentation by blasting on the energy consumption, productivity, minerals' recovery, …
Understanding the impact of geotechnical ore properties and blast
Rock Quality Designation parameter has little effect on mill performance. • 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 ...
Power draw of the crusher when varying the speed and CSS, not
Level comminution process for brittle materials generally use impact principle with beat and crazy [13]. First-degree communion process of the crusher, the size of the material is centered between ...