Mechanical properties and micro characterization of coal

With the improvement of coal mining depth and mechanization level the difficulty of coal slime water CSW disposal increases The preparation of cementitious materials with CSW can not only solve the disposal problems but improve the structural stability and mechanical properties of coal gangue CG piles as a cementitious material At the same time

Characterization and acid leaching of rare earth elements in coal

Some studies have used pre enrichment methods including gravity separation density fraction 17 and flotation 18 19 20 to extract REY in coal These methods can somewhat pre enrich REY but the results are relatively low and the recovery ratio is low 21 Wet leaching is an effective method of extracting REY from coal and coal gangue Pan et al 22

Exploring the influence of native minerals in coal

The invention discloses an underground coal gangue hardness separator which comprises a material inlet formed in a shell wherein a material intake hopper is arranged above the material inlet; the shell is installed on a rack and is provided with a plurality of groups of queueing baffle plates; a hardness measurement instrument is arranged between each group of queueing

Evaluation of an Underground Separation Device of Coal and Gangue

A novel underground device for separation of coal and gangue was introduced Mixed materials of coal and gangue from five coal mines were crushed and tested using five rotor speeds The results showed that separation of coal and gangue underground can be executed effectively under certain conditions the greater the hardness difference between coal and

Particle size distribution of coal and gangue after impact

Based on the separation and backfilling system of coal and gangue the mineral material impact experiments were conducted utilizing the hardness difference between coal and gangue according to the uniaxial compression experiments The broken coal and gangue particles were collected and screened by different size meshes The particle size distributions of coal

A facile green and cost effective manufacturing process from coal

Utilization of high filler coal gangue CG to produce cost effective composites is a promising strategy To clarify the impact of high filled CG on composite preparation and performance in this research the composite was prepared from CG and polyethylene PE through physical mixing and then hot pressing The role of CG in the properties of the

Progress in the utilization of coal gangue for soilification

Moreover coal gangue contains nutrients essential for plant growth [9] By processing it appropriately coal gangue can be transformed into soil amendments for soil remediation and improvement paving the way for a synergistic approach to coal gangue utilization and mining area ecological restoration

The use of coal gangue as a planting substrate in arid mining

Coal gangue is a black solid waste generated during the extraction and refinement of coal resources Luo et al 2020 that is increasingly being accumulated at mining sites in China due to the increasing coal production Li et al 2019; Zhu et al 2022 Data indicate that the total accumulation of coal gangue associated with coal production in China has

The influence of carbon imperfections on the

Furthermore it is evident that variations in carbon content and distribution directly impact the levels and distribution patterns of silicon aluminum elements within the coal gangue Hence a strong correlation exists between the macroscopic properties such as crushing value and hardness of coal gangue and the carbon content and distribution

Bacterially induced CaCO3 precipitation for the enhancement of

In the field of civil engineering coal gangue could be used as aggregates to make concrete blocks [3] [4] bricks [5] lightweight concrete [6] and other low value added building materials However the low hardness and high porosity of coal gangue aggregate lead to its high water absorption and low strength [7]

Evaluation of an Underground Separation Device of Coal and Gangue

According to the regression analysis of the results there was a close linear relationship between the lost coal rate mixed gangue rate hardness of coal and gangue and the rotor speed The lost coal rate increased as the hardness of coal increased and decreased as the rotor speed increased

Preparation crystallization kinetics and stabilization behavior

The steel slag and coal gangue used in this work were sourced from Hunan China with particle size ranging from to mm By using XRF the main chemical ingredients of the original materials were derived as shown in Table SiO 2 content of coal gangue % is approximately times more than that of steel slag % On the

Synergistic action and effect mechanism of coal gangue

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

Environmental impact assessment of acidic coal gangue

Environmental impact assessment of acidic coal gangue leaching solution on groundwater a coal gangue pile in Shanxi China Yanwen Guo · Xiangdong Li · Quanzhi Li · Zhenqi Hu lower carbon content and higher hardness consti tutes approximately 20 percent of raw coal production and is co discharged during coal mining operations

Direct impact of sieving coal and gangue

Given the differences of hardness between coal and gangue after selective crushing the gangue with the higher hardness was crushed less and coal with lower hardness crushed more which could be separated by a 50 mm sieving plate

Orthogonal Test and Support Vector Machine Applied to

In order to find the influence factors on coal and gangue separation the article put forward an optimization design based on a support vector machine SVM and orthogonal experimental method The crushing rates of coal and gangue were chosen as investigation target and a comprehensive analysis was made for the coal gangue hardness relative difference

coal gangue Tradução em português Linguee

Muitos exemplos de traduções com "coal gangue" Dicionário português inglês e busca em milhões de traduções Consultar o Linguee; Propor como tradução para "coal gangue" with Mohs hardness below 9 3 and humidity less than 6% such as feldspar calcite talcum marble ceramics manganese ore iron ore phosphate rock

Development and characteristics of sustainable ultra high

Coal gangue CG commonly discarded as waste is a primary byproduct of the coal mining and production process accounting for 10 % 25 % of coal production [1] [2] [3] whose nature is a rock with low calorific value and harder than coal that accompanies coal seams [4] In China it has become one of the biggest individual industrial solid wastes stockpile

The use of coal gangue as a planting substrate in arid mining

Coal gangue is a black solid waste generated during the extraction and refinement of coal resources Luo et al 2020 that is increasingly being accumulated at mining sites in China due to the increasing coal production Li et al 2019; Zhu et al 2022 Data indicate that the total accumulation of coal gangue associated with coal production in China has

Experimental study on constitutive relation of coal gangue

China possesses abundant coal resources yet limited oil and natural gas reserves thus establishing coal s dominant position within China s energy structure [1] CG is a mixed derivative of carbonaceous and other rocks resulting from the coal mining and washing processes and its primary constituents are Al 2 O 3 and SiO 2 [2] In China CG production

Study on the mechanism of coal pillar instability in coal seam

The plastic zone initially manifests at the point where the gangue is separated ultimately leading to the overall instability failure of the coal pillar As the hardness of the gangue inclusion within the coal pillar increases the peak compressive strength of the coal pillar gradually rises albeit not surpassing the peak compressive strength