·the major parameter responsible for coal cake break age at coke plant the stability of coal cake was further investigated by measuring the shear strength of the cylindrical coal cake by universal strength testing machine Fig 5 Bulk Density and Stamping Energy Measurement Plant Scale 30 days bulk density measurement trial was carried
·Comparing the mean crushing strengths of granulated coal ash it was found that B with the highest cement content had higher strengths than A Looking at the results for C and D which had the same cement content as A but were manufactured in a different way it appeared that C had the same strength as B but
·Dong et al [44] gained the compressive strength of coal particles in 1 3 mm particle size range is 2 5 MPa through coal particle compression experiment According to the above data the crushing rate of coal particles and roadway collision can be estimated by using Eqs 15 18 and 20
crushing coal more finely before charging it into a coke oven is effective in improving the strength of the product coke When the coal size diminishes excessively however coal and the coke strength 8 while Asada et likewise using inertinite concentrated coal classified into two size ranges below and from to
·By combining these results with the experimental results from the literature the suitability of the Weibull model to describe the size effects on the breakage strength of rock grains is discussed To understand why larger grains possess lower strength a bonded particle model BPM is established in YADE to simulate the particle crushing tests
·To explore the migration and crushing characteristics of the outburst coal outburst simulation experiments under different gas pressures MPa MPa and MPa were carried out using
·There are a large amount of Si and iron particles in the GF carbon matrix which lead to the poor bond of coal particles and the low crushing strength of GF Compared with QE3 the number and diameter of large pores in LQ decreased which resulted in its decrease of porosity and increase of crushing strength
·The coal particle fragmentation index was derived based on the relationship between coal crushing energy and coal internal gas energy Also it is concluded that there is a linear relationship between CES and the fragmentation index h The slope of the curve fitting can represent the intensity level of coal particle ejection and the intercept
·Understanding the mechanical properties of coal is crucial for efficient mining and disaster prevention in coal mines Coal contains numerous cracks and fissures resulting in low strength and challenges in preparing standard samples for testing coal fracture toughness In engineering indicators such as the hardness coefficient f value and Hardgrove grindability
rapidly and exceeds the strength of the coal body To achieve the effect of crushing the following conditions need to be met in the experiment 1 the gas pressure reaches the critical value of crack growth The dynamic tensile failure of coal particles is the formation of tensile stress on the surface of the crack by gas
·The crushing value is the performance index of aggregate resistance to crushing The smaller the crushing value of aggregate the higher the strength The crushing value of CGC was lower which was % lower than that of CG and only % larger than that of NCA Si and Al in coal gangue were activated at high temperature [10]
·The size dependent crushing strength of single rockfill particles affects the mechanical behavior of rockfill materials Understanding and capturing the size effect of single particle crushing strength accurately is essential to investigate the gradation evolution and the mechanism of the scaling effect of rockfill materials However laboratory rockfill particle
·Cenospheres are being used in various industrial applications mainly due to their low density high crushing strength and good thermal and electrical insulation properties However for better and most effective usage of cenospheres as a filler material it is essential to determine their crushing characteristics With this in view efforts were made to develop a
·The factors affecting the mining efficiency of top coal in fully mechanized caving mainly include coal seam occurrence coal seam thickness and burial depth etc and coal body strength fracture density and distribution in coal body and gangue distribution in top coal When the top coal strength is too high f > 3 or the crack is not formed
·crushing strength and the modulus of rupture MOR of dried or Þred refractory shapes of all types The test methods appear in the following sections Test Method Sections Cold Crushing Strength 4 to 9 Modulus of Rupture 10 to 15 The values stated in inch pound units are to be regarded as standard The values given in parentheses are
Uniaxial compressive strength UCS is one of basic parameters to measure the mechanical properties of coal and rock mass It is extremely difficult to obtain the UCS of weak coals Based on the current engineering back ground of Xinyuan coal mine this paper proposes a new borehole penetrating method for a rapid measurement of the UCS of weak coal It provides a
·Holda to study changes in the crushing strength of coal due to carbon dioxide sorption The tests were carried out on 4 mm size low rank coal % carbon by weight cubes The tests were performed under two conditions The first set of tests consisted of crushing coal in air under normal atmospheric conditions of
·The test results of coal samples with different gas pressures show that gas weakens the strength of coal significantly A specific functional relationship was established between particle size distribution and specific crushing work and Protodyakonov coefficient which is expected to be applied in coal mining enterprises To systematically
·Energy Evolution and Coal Crushing Mechanisms Involved in Coal and Gas Outburst Chaolin Zhang 1 2 Peizhong Wang 1 Xianfeng Liu 3 4 Enyuan Wang 1 2 Qiaozhen Jiang 1 and Mingliang Liu1 Received 5 July 2023; accepted 14 November 2023 Published online 16 December 2023 Coal and gas outburst is a dynamic disaster that poses a significant threat
·Ferro coke as a new burden of blast furnace BF can not only greatly reduce the energy consumption and CO2 emission but also promote the resource utilization by using the low quality iron ore and low grade coal However the strength of ferro coke decreased with the increasing amount of iron ore powder In order to maintain the strength of ferro coke while
The dynamic strength and crushing degree of coal sample are deepened with the increase of impact velocity Compared with natural coal samples saturated water coal samples have stronger crushing property and lower dynamic strength The primary forms of fragmentation morphology observed under dynamic loading include splitting fragmentation and
·weight of coal powder agglomerates on compressive strength of the agglomerates Coal agglomerates of were produced and the weight and crushing strength of the agglomerates were determined Kerosene paraffin oil was used as a bridging liquid The relationship between the crushing strength of coal agglomerates and agglomerates
·The results of K CG and KW CG treatments were similar to PC CG indicating that the single addition of K feldspar or wollastonite almost had no improvement on the compressive strength of coal gangue The crushing rates of KB CG and KF CG decreased to % and % respectively reduced by % and % compared to Raw CG %
