coal gangue hardness in Mexico

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 …

Comprehensive utilization and environmental risks of coal gangue: A

The amount of coal gangue, a by-product of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal gangue without appropriate utilization has resulted in a squander of resources, waste disposal and environmental pollution issues. Over the past few decades, there has been …

Study on the macro–micro evolution of compaction …

Currently the main method of mine solid waste disposal and utilization is to apply gangue to underground filling. For the grading characteristics of coal gangue in the hollow zone in underground ...

Low-carbon utilization of coal gangue under the carbon …

Coal gangue, produced during coal mining and processing [1, 2], is one of the most extensively produced solid wastes in China [1, 3], accounting for approximately 10%‒20% of raw coal production [].The accumulation of coal gangue causes serious environmental, social, and economic problems in the coal mining area [].Heavy metals …

Comprehensive utilization and environmental risks of coal …

The amount of coal gangue, a by-product of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal …

Effect of Coal Gangue Grading Characteristics on cemented …

The aggregate is composed of coal gangue sourced from Daizhuang Coal Mine, Shandong, China. Coal gangue is typically employed as a filling aggregate in coal …

Impact-Crush Separation Characteristics of Coal and Gangue

The selective crushing method is to use the difference in hardness of coal and gangue. The coal and gangue will be put on the hardness plate to crush, the gangue with high hardness will keep the ...

Road Performance Evaluation of Unburned Coal Gangue in …

The typical unburned coal gangue in the Heilongjiang region is mainly composed of SiO2, Al2O3, and Fe2O3, which accounts for approximately 91% of the total mass. The unburned coal gangue meets the minimum CBR requirement of 8% after 7 freezing–thawing cycles. This study helps fully and reasonably utilize typical unburned …

Effect of raw material ratio and sintering temperature on …

Coal gangue (CG), as a solid waste generated in the process of coal mining, ... HV-1000 automatic transfer micro-hardness tester was adopted to characterize the hardness of artificial aggregates, and the calculation method referred to …

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 …

Migration transformation, prevention, and control of typical …

Coal gangue is one of China's main industrial solid wastes, which contains various harmful heavy metal elements, such as lead (Pb). The long-term accumulation of coal gangue causes Pb to migrate to the surrounding environment due to weathering and rain erosion, eventually endangering human life and health with its continuous …

Rapid Analysis of Composition of Coal Gangue Based on …

Coal gangue is the main solid waste in coal mining areas, and its annual emissions account for about 10% of coal production. The composition information of coal gangue is the basis of reasonable utilization of coal gangue, and according to the composition information of coal gangue, one can choose the appropriate application …

Sustainable and clean utilization of coal gangue: …

of a large amount of coal gangue and the failure to fully utilize or dispose it, it caused problems on the environment in the air pollution and water pollution, and triggered some geological disasters such as landslides and coal gangue debris ows [12]. Fortunately, coal gangue is a type of low-carbon, hard black rock with SiO 2 as its main compo-

Study on the mechanism of coal pillar instability in coal …

In these investigations, the stope strip that encompasses gangue, soft-hard coal, and coal-rock is scrutinized, thereby furnishing a crucial theoretical foundation for coal seam mining that involves gangue and coal pillar retention. Nevertheless, there is a paucity of research on the frictional effect, carrying capacity, and stress state of ...

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 …

Particle size distribution of coal and gangue after

The coal and gangue will be put on the hardness plate to crush, the gangue with high hardness will keep the original shape, and the coal with lower hardness will be crushed and then screened [29 ...

The Current Situation of Comprehensive Utilization of Coal Gangue …

Coal gangue is a kind of solid waste with a low calorific value produced in the process of coal mining and washing. According to statistics, by the end of 2019, China's accumulated amount of ...

Exploring the influence of native minerals in coal gangue on …

A systematic examination unveils the consequences of varying SiO 2 content on physical, mechanical, thermal, and microstructural attributes of the composites. SiO 2 …

Study on the macro micro evolution of compaction …

characteristics of coal gangue with dierent grain sizes under side‑limit compression ... the gangue exhibits high hardness and resistance . 3 Vol.:(0123456789) Scientic Reports | (2024) 14:4910 ...

Influence of coal gangue mulching with various thicknesses …

Overall, to enhance the soil water storage capacity in mining areas, the results suggest that coal gangue mulching with a thickness of 8–16 cm and particle size …

Trace Elements in Coal Gangue: A Review | IntechOpen

Coal gangue is one of the largest industrial residues. It has high ash content, low carbonaceous content, and heating value. Meanwhile, it has some trace elements. Large quantities of coal gangue cause serious environmental problems by polluting the air, water, and soil as well as occupying a tremendous amount of land. …

Research on the impact and control techniques of gangue rib in hard

Many scholars have conducted research on the collapse and compaction of gangue motions at different mining heights and coal seam dip angles, as shown in Table 1.Liu et al. [20] explored the force of gangue impact and lateral compression for a support structure during gangue heaping. Sun et al. [21] investigated the spatiotemporal …

Assessment of heavy metal(oid) pollution and related health …

The coal gangue dump may introduce heavy metal(oid)s (HMs) into surrounding agricultural soils, posing potential health risks to nearby communities. This study evaluated heavy metal(oid) pollution ...

Excess sulfur and Fe elements drive changes in soil and

The results suggested that coal gangue significantly influences soil S, pH and plant species after 8 years of natural recovery. The CK-far plots contained relatively …

Characterization and acid leaching of rare earth elements in coal …

Some studies have used pre-enrichment methods, including gravity separation (e.g., 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 …

Preparation and characterization of coal gangue/Al …

With the increase of coal gangue powder, the hardness of coal gangue/Al cermet gradually increases, while the static compression strength first increases and then decreases. When the mass fraction of gangue is 25wt%, the coal gangue/Al cermet material has the best performance. Density is 2.23g/cm3, hardness is 752HV,

Coal Gangue: Composition, Processing, Use And Recycling

Coal gangue power generation Coal gangue grinding adopts fluidized bed technology. When the carbon content is greater than 20%, it can be used as energy and can be used to generate electricity. Recycling of coal and pyrite Coal gangue adopts composite dry coal preparation, cyclone, and heavy medium separation. When the coal …

Evaluation of an Underground Separation Device of Coal and …

The results showed that separation of coal and gangue underground can be executed effectively under certain conditions: the greater the hardness difference …

Impact-Crush Separation Characteristics of Coal and Gangue

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 …

Research Progress on Comprehensive Utilization of Coal Gangue

Coal gangue is one of the largest mine solid wastes in China, and its discharge and stockpiling have caused resource waste, environmental pollution and other problems. Starting from the resource characteristics of coal gangue, this paper systematically discusses the ways and research status of coal gangue resource …