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The hardness is low (Platts hardness: 1– 3), and the particles are fragile. The hydraulic permeability coefficient is relatively small: 1 × 10 −13 – 2 × 10 −9: ... The characteristics of the selected substrate include high porosity and permeability coefficient, stable chemical properties, strong decontamination ability, etc., which ...
Why is river pebble popular for artificial sand production? Besides river pebble, granite, limestone, quartz sandstone, basalt and even construction waste can be used to process artificial sand. But...
In the test, the hard granite, a kind of solid and compact rock with the Platts hardness coefficient of 15–17, was selected as the grinding material. The mass loss of the …
The hardness of the samples was tested by D-type shore hardness durometer and a pin-on-disc setup was used to measure the friction coefficient and wear rate of the samples. The analysis of the experimental results showed the distinctive effect of the layer orientation and layer thickness which further discussed in the paper.
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The influencing parameters of the height of the water-conducting fissure zone ( y ) include the mining depth of the working face (m, x 1 ), inclination angle of the coal seam (°, x 2 ), thickness of the coal seam (m, x 3 ), hardness of the coal seam (hard coal: Platts coefficient is greater than 1; soft coal: Platts coefficient ...
China ROSCHEN GROUP latest company news about A quantitative indicator of the solidity of the ore..
Taiwan Provincial Standard of the People's Republic of China, Platts density test. CNS 8762-1982 Micro Hardness Testing Machines for Vickers and Knoop Hardness; CNS 8763-1983 Method of Test for Micro Hardness Testing Machines for Vickers and Knoop Hardness; CNS 13983-1997 Method of test for Vickers hardness of fine ceramics
Rockwell hardness 100 M-Scale ISO 2039-2 Thermal properties Value Unit Test Standard Melting temperature, 10°C/min 280 °C ISO 11357-1/-3 Glass transition temperature, 10°C/min 90 °C ISO 11357-1,-2,-3 DTUL at 1.8 MPa 270 °C ISO 75-1, -2 DTUL at 8.0 MPa 215 °C ISO 75-1, -2 Coeff. of linear therm expansion, parallel 0.19 E-4/°C ISO 11359-2
Coefficient of friction Compression set after 24 hr at 175C % Compressive modulus GPa Compressive strength MPa Elongation at break % Hardness - Rockwell Izod impact strengt h J m-1 Poisson's ratio Tear strength N mm-1 Tensile modulus GPa Tensile strength MPa Cellulose Acetate Butyrate CAB - - - - - 60 99 260 - - 0.3-2.0 20-60 Ethylene-
The Platts hardness coefficient of #15 coal is f = 0.17~0.8, the recoverable index is 1.0, the coefficient of variation of coal seam thickness is 12.93%, the thickness of coal seam …
4.3.3 When the coal slurry volume concentration is greater than 20% ~ 30%; the coal hardness hardness Platts coefficient f is greater than 1.5 ~ 2; the radon content in coal does not exceed 10% Under the conditions, 1200h operation without overhaul. 4.4 The operating temperature rise of the bearing shall not exceed 35 ° C, and the limit ...
The Platts hardness coefficient of blue-stone is 10–12, while that of artificial coal-rock is 1–2. Download: Download high-res image (398KB) Download: Download full-size image; Fig. 5. Compression condition of rock acted by conical cutter.
A mine in Guizhou province in China mines coal seam 6#, the structure of which is simple, with 2.41 m of thickness, a dip angle between 1°and 3°, and a platts hardness coefficient of approximately 0.8, and it is a soft coal seam. The positional relation of roadways is shown in Figure 1. Mining face 1603 is the first mining face in the west of ...
The other parameters include the Platts coefficient of ore f 1 =12–14, Platts coefficient of rock f 2 =10–12, looseness coefficient of ore K 1 = 1.43, looseness coefficient of rock K 2 = 1.38. The integrity of the ore body in the explosion area is good in the experimental design, and the surrounding rock belongs to class II.
The influencing parameters of the height of the water-conducting fissure zone ( y ) include the mining depth of the working face (m, x 1 ), inclination angle of the coal seam (°, x 2 …
1, the mining object high hardness (Platts hardness coefficient =16 18), the material block degree (weight>500 kgaccounted for 30%), the Qing (eating) foundation work, this is the worst condition. As in …
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With an inclined width of 195 m and a mining depth of 1000 m, with the working face had an inclination angle of 3 to 10 and the Platts hardness coefficient of 0.26, without …
Processes 2022, 10, 274. https://doi/10.3390/pr10020274 Article Analysis on Water Inrush Prevention Mechanism of Paste-Filled Floor ...
According to the borehole histogram of 1301 working face, the roof strata of 3 coal in 1301 working face mainly contain sandstone and sandy mudstone, among which the experimental value of sandstone compressive strength is 54~77.2 MPa and platts hardness coefficient f = 6.3.
The Platts hardness coefficient of #15 coal is f = 0.17~0.8, the recoverable index is 1.0, the coefficient of variation of coal seam thickness is 12.93%, the thickness of coal seam is 4.1~6.5 m, the average thickness is 5.2 m, and the thickness of the coal seam is stable. The dip angle of the coal seam is 5~14°, with an average value of 8°.
A technology of mechanical properties and ore, used in the application of stable shear force to test the strength of materials, grain processing, testing the hardness of materials, etc. Pulverization and other problems, to achieve the effect of reducing the content of particle size, reasonable composition, and increasing the content of the intermediate easily selectable …
The Platts hardness factor of coal seam is less than 1 (f < 1), and the structure is simple. The inclination angle is between 27° and 55°, with an average of 45°. The coal quality …
Different rocks have different hardness indexes and drillability are also different. Ruggedness is often used to indicate how easy it is to break a rock. The size of the firmness is expressed by the firmness coefficient. The firmness coefficient is also called the hardness coefficient, which is also called the Platts hardness coefficient f value.
A technology of useful minerals and determination methods, applied in the application of stable tension/pressure testing material strength, grain processing, testing material hardness, etc. There are deviations and other problems to achieve the effect of enhancing the content of the intermediate easy-to-select particle size, reasonable particle size composition, and reducing …
The size of the sturdiness is expressed by the coefficient of firmness, also known as the hardness coefficient, also known as the Platts hardness factor f. Robustness factor f=R/100 (R unit kg/cm2) Where R is the unidirectional ultimate compressive strength value of the rock standard specimen.
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A mine in Guizhou province in China mines coal seam 6#, the structure of which is simple, with 2.41 m of thickness, a dip angle between 1°and 3°, and a platts hardness …
Hydraulic cylinder pressure signal-based method for identifying rock hardness and identification platform A pressure signal and hydraulic cylinder technology, applied in the field of methods and identification platforms, can solve the problems of wear, fall off, and failure of cutter heads, and achieve the effects of stable performance, simple ...
