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3% of the total. The non-dimensional percentile sizes between 10 and 90% for each blast are described through power functions of the powder factor above grade; the model coefficients (i.44 kg/m3. Six blasts were monitored, located one behind the other in the same quarry area. The rock structure was blocky, the water level and the usage of explosives were variable within and between the blasts; however, the distribution of explosive energy in the blocks was relatively uniform and the performance of both explosives per unit mass appeared to be similar. The model shows a good capability to describe fragmentation from 10 to 90 percentile sizes, with an expected error below 6% and a maximum likely error less than 15%.This paper investigates fragmentation in an aggregate quarry in the light of the fragmentation-energy fan concept.e. From them, using the principles of the fragmentation-energy fan and the Swebrec distribution properties, the fragmentation can be expressed in terms of the powder factor by means of five parameters: the fan focus coordinates and the three parameters of a function of the exponents versus the percentage passing. The oversize material that was not directly fed to the plant after the blast corresponds to 3–9.28 and 0. Fragmentation of the plant feed was measured using an online digital image analysis system and three belt scales in the crushing plant. nine prefactors and nine exponents) are statistically significant. The powder factor above grade was between 0. Data from image analysis was used to build the size distribution in the coarse range (fragments above 120 mm), and the passing fractions at 120 and 25 mm obtained from belt scales data were used in the range 120–25 mm.
Nevertheless, larger particle sizes increased for the studied samples, indicating that the RF method is not appropriate to reduce the comminution energy of the studied samples. The findings indicated that the product size distribution of RF-treated samples improved compared to the as-received samples for the dolerite and sandstone, which may suggest an improved grindability, while that of marble remained the same. The first attempt toward this objective was performed using dolerite, marble, and sandstone .Radio frequency dielectric heating has not drawn the attention of researchers like the microwave has, even though significant research had been conducted for its application in the food industry. There is a need to investigate this technique using other ores . Little is known about the possibility of the method to improve the grindability of ore.
1) Processing Silica SandWhat the analysed alternatives have in common is the mining and basic processingoperation.The main assumptions for the first seven alternatives were as follows: surface mining usingbulldozers; transportation from a mining site to the processing plant by dumpers; thenwashing and sizing in the processing plant which included sieve washing, attritionscrubbing, hydro-cyclone classifying and dewatering.6.21.The glass-grade silica sand production corresponded to alternatives, named as follows:1) Basic processing by washing and sizing :i) Basic/wet; andii) Basic/dry;2) Electrostatic/dry separation;3) Gravity concentrationi) Gravity /wet; andii) Gravity /dry;4) Flotation concentration :i) Flotation /wet; andii) Flotation /dry;(note: Flotation was abandoned because of plant destruction Environment)© Hassan Harraz 2016 21.
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