The effect of breakage method on the shape properties of an iron-oxide hosted copper–gold ore

Vizcarra, T.G.; Wightman, Elaine M.; Johnson, N. W.; Manlapig, E.

doi:10.1016/j.mineng.2011.07.007

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…According to the record of the high-speed camera, the hammer did not rebound after impact because the hammer mainly contacted the sample at a vertex, in a line, or at a small face initially, and then the contact mode changed to face mode because of the smashing of the contact part. e values of breakage energy of each particle are shown in Figure 9 according to the calculation with test data using equation (9). e specific breakage energy is defined as the breakage Shock and Vibration energy divided by particles mass, as shown in equation (10).…”

Section: Breakage Resultsmentioning

confidence: 99%

“…During ore processing, the particles are irregular with greatly varying shapes and initial sizes, so the difference between the experimental values and virtual values of breakage energy can be reduced to carry out individual impact tests using irregular particles, which helps improve the accuracy of the design of technology parameters. e particle shape affects the loading modes and breakage process, resulting in the change of breakage characteristics and energy characteristics [9,10]. e impact breakage characteristics of nonspherical coal were studied by Zheng et al [11] using discrete element method (DEM) simulation with the parallel-bond model of primary particles.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

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Particle shape and size are main factors influencing particle breakage. Single-particle breakage tests were conducted on irregular magnetite ore using modified drop weight impact equipment to analyze the effect of shape and size on specific breakage energy. A method to measure the effective breakage energy is presented. Ore particles with different sphericities and different sizes were broken into several fragments with differing impact energies in the tests. Experimental studies indicate that the shape of particles significantly influences the impact loading mode and breakage progress; the specific breakage energy has an obvious relationship with the sphericity and the initial size. The specific breakage energy decreases with larger initial loading area. The particle needs less specific breakage energy if the shape or placement state is more conducive to tensile fracture. There is an increase in specific breakage energy corresponding to an increase in particle sphericity with fixed initial size range. With the increase in the initial size of the particle, the specific breakage energy decreases with fixed sphericity range, which presents a power function with the exponent −0.5. The comprehensive relationship between specific breakage energy, particle sphericity, and initial size was established, showing that the input power of the crushing machinery and the optimization of crushing technology should be performed with consideration of the influence of particle shape and initial size to reduce specific energy consumption and improve energy efficiency.

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Section: Breakage Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

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“…The rod mill exercises line loads on the particles and the dominant breakage mechanism is the impact, during which the sharp edges are created, turning the particle to become more elongated [13]. Whereas the ball mill exerts point loads on the particles, and the predominant breaking forces are abrasion and chipping, which could eliminate the corners and sharp edges of the particles, turning them to become more rounded [14,15].…”

Section: Shape Indexes Of Scheelite Particles By Different Millsmentioning

confidence: 99%

“…For the rod mill, line loads are exerted on the mineral particles, and the predominant breaking forces are the impact which can produce particles with sharp edges [13]. In contrast, the ball mill imposes point loads on the particles, so that the main forces are abrasion and chipping which can trim off the corners and sharp edges of particles efficiently [14,15]. Mill particles with different shapes always exhibit different gravity or flotation behavior.…”

Section: Introductionmentioning

confidence: 99%

Tuning the Morphology and Surface Property of Mineral Particles by Grinding Media

Gao¹,

Li²

2018

Abrasive Technology - Characteristics and Applications

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Grinding of minerals for particle size reduction and liberation is a prerequisite for successful mineral flotation separation and powder modification. Different grinding media produce mineral particles with different physical morphology and surface chemistry properties. Different mill particles expose different proportions of cleavage surfaces which lead to different shape indexes and different surface reactivities to organics, such as collector. Rod mill produces scheelite particles with a higher exposure of more reactive {101} surface that are beneficial for a stronger interaction with collector. More exposure of {101} surface also causes the rod mill particles to possess such values as larger elongation and flatness that are essential for particles attachment to air bubbles by shortening the induction time. The rod mill particles have a lower critical surface tension, greater hydrophobicity and a better flotation recovery when treated with the collector. In addition, the rod mill particles with a narrow particle size distribution have a smaller specific surface area, so the full monolayer adsorption of the collector on their surfaces can be achieved at a relatively lower concentration. These findings will help establish the relation between the particle surface physicochemistry and wettability, hence providing valuable guidance for the optimization of flotation separation and powder modification technology.

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“…Stirred mills are believed to produce more rounded particles than the conventional mills due to attrition being the dominant mechanism in the mill according to Andreatidis (1995). The rounding of the particles was due to the removal of topographical features protruding from particle surfaces through the action of attrition (Gao and Forssberg, 1995, Kaya et al, 2002, King, 2012, Pourghahramani, 2012, Vizcarra et al, 2011.…”

Section: Effect Of Breakage Mechanism On Particle Shapementioning

confidence: 99%

Investigation of the breakage mechanism in high speed disk-type impeller stirred mills and its influence on the mineral liberation

Resabal¹

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The goal of comminution is not only size reduction but most importantly is the liberation of the minerals of interest so that they can be effectively separated from the gangue in the downstream separation process. It has been known that comminution has a significant influence on the way minerals are liberated and in recognition of this, it is important to have a better understanding of how the liberation properties of the minerals are affected by the method of size reduction. This thesis investigates the type of breakage mechanism in stirred mills, particularly at the regrind stage, and how it influences the liberation properties of the minerals of the rougher concentrates.Three rougher concentrates of the Tampakan ore were selected for this study: Primary (contains chalcopyrite as the main copper-bearing mineral); Medium Sulphur (contains bornite as the main copper-bearing mineral, with a significant amount of chalcocite; and High Arsenic (contains bornite as the main copper-bearing mineral with the presence of chalcocite and a copper-arsenic mineral in the form of enargite). These concentrates were comminuted in the M1.5 V Netzsch stirred mill at different durations to produce different product size distributions. Progeny particles were then characterised using the JKMRC'S mineral liberation analyser (MLA) on a size-by-size basis.It was found that the dominant breakage in stirred mills is attrition based on the observations on the particle size distributions of the feed and the products as well as the evolution of the shape of the particles as grinding progressed.The mode of breakage in stirred mill was assessed based on the observations of the patterns in the particle size distributions and the evolution of the particle shape in the products ground for different durations. A shifting of the peak towards finer size fractions with increasing grinding time which is characteristic of an impact breakage mechanism was not observed in the products of the stirred mill. The peaks observed in the feed were still present after grinding, although the size of the peaks at the relatively coarser size fractions significantly reduced while the peaks found in the fine size fractions increased with increasing degree of comminution. This trend in the particle size distributions between the feed and the products is an evidence of an attrition mode of breakage.iii Analysis of the particle shape distributions of the feed and the products showed that attrition produced two populations of particles -the core particles which inherit the shape of the parent particles and either remain in the current size fraction or goes to the next smaller size fraction with shapes that are generally elongated and smooth; and the attrited particles that are chipped off from the surface of the parent particles and report to the +10 µm and -10 µm size fractions. Furthermore, it was also observed that while breakage via attrition makes the particles smoother, it does not always result in the production of rounder particles as the result of this ...

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The effect of breakage method on the shape properties of an iron-oxide hosted copper–gold ore

Cited by 12 publications

References 15 publications

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Tuning the Morphology and Surface Property of Mineral Particles by Grinding Media

Investigation of the breakage mechanism in high speed disk-type impeller stirred mills and its influence on the mineral liberation

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