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A new generation of high-efficiency coarse and medium-fine crushers: CI5X series impact crushers
·This study examines the particle size and distribution of the main chemical components of gangue during the crushing process Coal mine gangue was chosen as the research object and its particle size and chemical components at various crusher discharge settings were examined through screening grinding chemical composition testing and other
The electric machine built in roller crusher is an explosion proof electric machine used in the crushing roller Results Both of these crushers can be used in the selective crushing technology of coal gangue in a coal mine and can meet the requirements of crushing different material sizes and generally avoid the centre of the roller crusher
·Crushing is an important link of coal and gangue selection and can be realized through selective crushing to make it more suitable for coal processing Impact crushing is the main fragmentized
·The crushing value of unburned coal gangue varies greatly among different mining areas but it is generally high Among them the crushing value of samples from sites 2 3 and 5 is less than 30% while the crushing value of samples from sites 1 4 and 7 is between 31% and 35% The unburned coal gangue contains soft rocks residual coal
·Due to the abundance of microcracks voids and a higher carbon content coal gangue displays increased water absorption and crushing value while also having a lower apparent density compared to natural aggregates [15] [16] These shortcomings lead to reduced durability and mechanical properties when coal gangue is employed as a concrete aggregate
·1 Introduction An increasing number of mining gobs are formed as underground coal resources continue to be mined [1] Caved fractured continuous bending and soil zones may be identified in response to longwall mining [2 3] Caved zones have been identified as porous media comprising crushed rock and coal of different particle sizes [4] As the working
ABSTRACT Utilizing the difference in hardness coal and gangue can be separated by the impact crush technology for utilization underground The influence of hardness and impact velocity on the crush ratio difference of coal and gangue was studied using an impact crush separator and was optimized using the orthogonal experiment method The equation of the impact crush
3 ·Using coal gangue as subgrade filler CGSF can address the accumulated issues of coal mine waste but also save the constructing costs which has the important ecological and engineering
·Gangue collection and preparation The material used in the test is gangue after crushing treatment which is taken from a mine in Inner Mongolia at a depth of 400 m
Compaction and Re Crushing Process of Crushed Coal Gangue Graded crushed gangue in the compaction process will be accompanied by the
Moreover coal gangue was a byproduct of the coal mining and washing processes accounting for approximately 10 % 25 % of the total raw coal production [[9] [10] [11]] Its carbon content was relatively low and its hardness was higher than that of coal [12] According to the data of China Resources Comprehensive Utilization the production amount of coal gangue in 2021
·The compaction and re crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry To study the compaction and re crushing characteristics of the gangue particles continuous grading and intermittent grading of two different structures were designed to study the bulk gangue particle
·Therefore scientific analyses of the basic properties of coal gangue such as water absorption firmness crushing value etc are necessary to ensure that coal gangue aggregate concrete meets all structural safety requirements at normal temperatures and can be used normally under high and low temperature conditions
·Sample preparation The coal gangue samples were collected 15 times and approximately 50 kg each time from the waste dump in the Renjiazhuang coal mine as shown in Fig 3a which is located in Ningxia Hui autonomous region China To solve the problems of the massive accumulation of coal gangue strong ground pressure and serious subsidence in the
·The bricks employed are coal gangue bricks from Taiyuan Brick Factory given their market availability and the study s exclusion of residual mortar influence in demolition bricks B100 are minimal ranging from % to % Crushing can be considered the reverse process of accumulation According to Francois s Apollonian model the
·The persistent reliance on coal has resulted in the accumulation of substantial coal gangue a globally recognized problematic solid waste with environmental risks Given the coal gangue properties and global land degradation severity the resourceful utilization of coal gangue as soil conditioners is believed to be a universally applicable cost effective high
·To calculate the distribution of particle size of crushing coal and ganguea mathematical model was built according to fractal additiona comparison was made between Weibull distribution and fractal distributionin order to ascertain the relationships between influence parameters and the coal fragmentation characteristic indexthe coal fragmentation
·It can be seen that compared with natural gravel coal gangue shows smaller apparent density but much larger water absorption and crushing index which implies the porous microstructure of coal gangue In particular the crushing index of the coal gangue in this test meets the requirement in GB/T 14685 2011 for the Ⅱ grade crushed stone used
·The compaction and re crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry
·In solid backfilling coal mining SBCM the deformation resistance of crushed gangue particle material CGPM is critical for controlling overburden strata movement and ground surface subsidence
·Selective crushing separation technology separates coal from gangue based on the hardness differences Matusiak et al 2021 Taking a hydraulic automatic sorter as an example hydraulic sorting rolls installed above a conveyor apply pressure to the material Coal gangue recognition is the first step in intelligent coal gangue sorting The
The impacting crusher was used to impact crushing test on coal and gangue from three mining with different impact distribution function of coal and gangue the influence of the impact velocity and the hardness of coal and gangue on the distribution function were got from the data fitting of experimental results show that Weibull distribution can descript the
·By selecting coal gangue from four regions crushing and sieving it comparing the calorific values of 0 1 mm and 1 16 mm coal gangue particles and then calcining the 0 1 mm coal gangue particles the characteristics of coal gangue before and after calcination were analyzed By substituting 30% of cement with 0 1 mm coal gangue
