The present study investigates the effects of feeding properties on rock comminution by a laboratory-scale jaw crusher. For this purpose, detailed cru…

This study shows that patch size plays important role in species richness and composition, however, the surrounding matrix, time experiencing fragmentation and human disturbance also affect the plant species richnessand composition. Forest fragmentation may lead deleterious consequences for plant community. Species richness and composition of …

This review chapter demonstrates how shockwave collisions can have a negative effect on fragmentation while detonation wave collisions can have a positive effect on fragmentation and throw and, therefore, overall mine efciency.

The fragmentation results then were paired with the crusher throughput values, and series of regression analysis were done in order to understand the effects …

The degree of rock fragmentation influences the productivity of excavator and loader, the throughput of crusher and mill, the energy consumption of comminution equipment, and the price of crushed end-products such as the industrial minerals and the construction aggregates (Sanchidrián et al., 2012).

In this study, a series of two dimension numerical modeling were performed using the discrete element method (DEM) to explore the effect of joint orientation on rock fragmentation by a TBM cutter.

The results indicate ore hardness is most influential in mid-range fragmentation, with a marginal effect in coarser fragmentations.

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.

A parameter study using a jaw crusher is designed to investigate the influence of feed gradation, feed rate, crusher setting and crusher speed on the crusher operation and the quality of the produced aggregates. The study is focused on the production of all-in large-size (top size ⩾90 mm) aggregates, suitable for use in subbase …

Air bubbles are an effective enhancement agent for DNA fragmentation in a sonication system, and continuously injecting bubbles into the DNA solution can enhance the fragmentation effect of ultrasound from three aspects.

A gyratory crusher was observed for 20 days and digital images of the crusher feeder were used to assess the fragmentation of each truck cycle, both quantitatively and qualitatively. The fragmentation was then correlated to ore type and efficiency to evaluate its margins of influence on loading and crushing.

The powder factor affects the fragment size distribution and the environmental hazards of blasting ut in a con-flicting manner. Increased powder factor enhances good fragmentation but results in further environmental discomfort. Bla t event 4 has the highest fragmentation efficiency of 46.53%, while 3 has the high

The size of fragments is the "seen" part of blasting results. It is very important in crushing as it effects production and downtime. Overly coarse fragmentation will reduce primary …

Since the efficiency of each crusher depends on the specific characteristics of its feed in terms of particle size distribution, the time and energy consumed per ton of the product can be used as a crushing index in the evaluation of blasting fragmentation [ 6 ].

The fragmentation results then were paired with the crusher throughput values, and series of regression analysis were done in order to understand the effects of blast fragmentation on crusher throughput. The analysis includes the relationship between P-20, P-50, P-80, and P-top values of size distributions and the crusher throughput results.

Dig time, truck load mass, fragmentation sizing, time through the crusher and power consumption were monitored for each load taken in three different blasts. …

In addition, they noted the prime objectives of blasting are to optimize fragmentation and to minimize environmental effects. Workman and Eloranta ( 2003) investigated the effects of blasting on optimum crushing …

Mine-to-crusher policy: Planning of mine blasting patterns for environmentally friendly and optimum fragmentation using Monte Carlo simulation-based multi-objective grey wolf optimization approach

Higher powder factor also decreases the SSE of the whole circuit. The rock fragmentation parameter, Rock Quality Designation (RQD), mainly impacts the coarser …

The rock fragmentation parameter, Rock Quality Designation (RQD), mainly impacts the coarser end of ROM size distribution; as the primary crusher breaks those coarser particles, no significant RQD effect on the plant throughput and the Size Specific Energy was observed.

Size reduction of minerals and rocks by breakage within crushers is dependant on the particle loading mechanism generated within the crusher. Crushers can be sub-divided into those that induce fragmentation by slow compression, such as a jaw or cone crushers, or those that induce fragmentation by dynamic impact, either by …

Therefore, all rock samples were crushed at the laboratory jaw crusher at the same crushing process, i.e., feed speed, feed size, and closed side setting, until reaching the proper size for ...

The degree of rock fragmentation influences the productivity of excavator and loader, the throughput of crusher and mill, the energy consumption of comminution equipment, and the price of crushed end-products such as the industrial minerals and the construction aggregates ( Sanchidrián et al., 2012 ).

Improvement of blast-induced fragmentation and crusher efficiency by means of optimized drilling and blasting in Aitik. ACKNOWLEDGMENTS The thesis project presented in this report was conducted in Boliden's Aitik mine; thereby I wish to gratefully thank Boliden Mines for their financial and technical support. I would like to express my very …

This lowers the chance of other rock choking and jamming the crusher. As stated by Peres and Chaves (2009), one of the mechanisms occurring in a jaw crusher is the arch effect, where the particles present in the crushing chamber are pressed against one another.

A gyratory crusher was observed for 20 days and digital images of the crusher feeder were used to assess the fragmentation of each truck cycle, both quantitatively and …

The role of different blasting energy input on fragmentation is studied, and related to needs at the plant. The effect of different feed sizes on energy consumption in crushing and grinding is ...

Heat-treatment is one such rock conditioning method to facilitate rock fragmentation. It is therefore necessary to investigate the effect of heat-treatment on the characteristics of rock fragmentation. This study is concerned with the rock fragmentation in crushing, which is experimentally studied utilizing the dynamic ball compression test.

Abstract. Some effects of accurate delay time on rock fragmentation have been examined numerically using a newly developed continuum damage model. Stress wave collision created by simultaneously initiating a continuous explosive column from opposite ends is simulated in both an axisymmetric environment and in bench blasting.

The primary crusher throughput was also monitored. Previous studies have demonstrated a direct correlation between improved fragmentation and increased productivity.