Influences of water filling timing on the deformation …
— The results show that the confined compaction deformation process of crushed gangue can be divided into three stages: the rapid compaction stage, crushing compaction stage, and stable compaction ...
Effects of particle size of crushed gangue backfill materials …
— Therefore, the double-yield model can wellsimulate the influence of gangue on stress redistribution [27]. In the gob-side entry driving process, the coal pillar's bearing capacity needs to be ...
Experimental study on permeability of crushed gangues …
— The permeability of crushed gangues was tested in triplicates and the average was used for analysis. In brief, a certain amount (m) of crushed gangues were packed into the cylinder of inner diameter of 2a (2a = 68) mm and height of 110 mm and connected to the electronic universal testing machine.Its height (h o) under natural …
Microscopic fabric evolution and macroscopic deformation …
— The irregular shape of gangue blocks will affect the coordination structure between blocks in the crushed gangue accumulation body, and then affect the engineering mechanical properties of crushed gangue in the process of load-bearing compression. In this paper, through CT scanning experiment, particle flow numerical simulation …
Experimental Investigation of Particle Size …
— 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 …
Experimental Study on Acoustic Emission of Confined …
crushed gangue under di erent loading rates was designed, and the acoustic emission (AE) signal ... of loading rate, the anti-deformation ability of crushed gangue showed a dynamic change process ...
Study of the Internal Rebreaking Characteristics of Crushed …
— The compaction of crushed gangue in the caved zone, and its influence on the overlying strata and surface movement, has significant impact on and plays an …
Particle-Crushing Characteristics and Acoustic …
— Crushed gangue backfilling material (CGBM) is most commonly used as a kind of solid backfill material for SBCM. When it is filled into the goaf, the phenomenon of particle crushing occurs in the …
Influence of block shape on macroscopic deformation response and meso
— The results show that: (1) the bearing capacity of crushed gangue materials increases with the increase of confining pressure; (2) the block aggregate in the gangue sample is gradually compacted ...
Mining & Mineral Processing Southern Africa
— In the mineral processing field, flotation techniques have witnessed significant trends and best practices that are shaping the industry. One prominent trend is the increasing reliance on digitalization and data analytics. Mining companies are investing in advanced sensors, data integration, and machine learning to gain deeper insights into …
Mineral Processing of Rare Earth Ores | SpringerLink
— 2.2.1 Occurrence. Rare earth minerals occur as fluorites, oxides, tantalates, carbonates, phosphates, sulfates, borates, silicates, etc. (Qi 2018).List of different rare earth minerals are presented in Table 2.3.The average concentration of REEs in the earth's crust is found to be 150–220 ppm, which is much higher than the concentration of other base …
Technology and engineering test of filling goaf with coal gangue …
— The process of filling goaf with coal gangue slurry is shown in Fig. 2. Specifically: the coal gangue is crushed by a multi-stage crusher and enters the screening machine for screening, the ...
Microscopic fabric evolution and macroscopic deformation …
— This study reveals the internal mechanism of macro deformation of crushed gangue under the triaxial compression from the perspective of the mesoscopic fabric …
Experimental Investigation of Particle Size Alteration and …
Xu [9] used crushed gangue, limestone, and gypsum as the main materials and fluorite and barite as the secondary materials and prepared an alite-sulfoaluminate cement at 1330 C.
Copper Mining and Processing: Processing Copper …
This process uses a series of physical steps and high temperatures to extract and purify copper from copper sulfide ores, in four basic steps: 1) froth flotation, 2) thickening, 3) smelting, and 4) electrolysis.
Compaction characteristics and energy dissipation of …
The compressive characteristics of crushed gangue with different particle sizes as shown in Fig. 5. The crushed gangue with a small particle diameter (0–10 mm) resists compressive deformation most effectively among the four particle gradations. Since the porosity of gangue increases …
(PDF) Effects of Water Immersion on the Long-Term Bearing
— To study the long-term bearing characteristics of crushed gangue in goaf under water immersion conditions, the creep test of the crushed gangue in the water immersion state was performed by using ...
Experimental Study on Nonuniform Compaction and Re
— The crushed coal gangue particles are widely used in solid backfilling. However, the non-uniform compaction and internal re-crushing behavior of crushed coal gangue under bearing-stress have not ...
(PDF) Comminution in mineral processing
— from other gangue particles. Process of Unlocking minera l particle is the relevant function of . ... being crushed into intermediate size from its originally huge size.
Experimental Study on Confined Compaction Deformation of …
— The results show that the confined compaction deformation process of crushed gangue can be divided into three stages: the rapid compaction stage, crushing …
Characterizations of macroscopic deformation and particle …
— The internal mesoscopic fabric evolution of crushed gangue during its bearing process (particle breakage, particle movement and force chain evolution) are the root causes affecting the macro ...
Compaction characteristics and energy dissipation …
— The stress–strain relationship of crushed gangue in the compaction process increases exponentially and can be divided into void compaction stage, structure adjustment stage and elastoplastic ...
Iron processing
Iron processing - Ores, Smelting, Refining: Iron ores occur in igneous, metamorphic (transformed), or sedimentary rocks in a variety of geologic environments. Most are sedimentary, but many have been changed by weathering, and so their precise origin is difficult to determine. The most widely distributed iron-bearing minerals are oxides, and …
How to Recycle and Process Coal Gangue: 7 Effective Ways
— CGC production process: 1 Coal gangue is crushed by a jaw crusher and ground by a ball mill. Raw materials are screened using a 100-mesh vibrating screen. ... The crushed gangue is ground into powder and sent to be refined into bricks. In addition to the above 7 uses, coal gangue can also been found the uses in porous ceramics, soil ...
Experimental Study on Confined Compaction …
Deformation of Crushed Gangue under Different Water Content Conditions. Appl. Sci. 2023, 13, ... The strain–stress relationship in the compaction process of crushed gangue and the crushing law of
Simulation test study on filling flow law of gangue slurry in …
— In the process of coal resource mining and consumption utilization, a large amount of coal gangue solid waste is accompanied 1,2.At present, the western mining area has become the main production ...
Study of the Internal Rebreaking Characteristics of Crushed Gangue …
— The crushed particle size came from the complete caved zone gangue in the longwall goaf of a mine. The maximum thickness of the caved zone was about 20 m, and the
Characterizations of macroscopic deformation and particle …
— An equation for predicting stress-strain relationship during compression-induced deformation of gangue backfill materials under multi-factor coupling effects was established and shows that this equation can predict compression- induced deformation in goaf, beneficial to providing a basis for predicting strata movement and surface …
Compressive deformation and energy dissipation of crushed coal gangue
— The stress–strain relationship of crushed gangue in the compaction process increases exponentially and can be divided into void compaction stage, structure adjustment stage and elastoplastic ...
Influence of block shape on macroscopic deformation response and meso
— The research process includes CT scanning test of the external contour of the randomly selected gangue block, reconstruction of 3D model of real shape of gangue block, acquisition and classification of 3D shape parameters of gangue block, construction of particle flow numerical model of crushed gangue with different block shapes under the …
Morphological characterization of crushed coal gangue …
— Then, X-ray computed tomography (XCT) scanning with different resolutions was conducted on uncrushed and crushed CGPs, followed by a series of image processing and analysis procedures. Finally, the effects of different impact velocities on the evolution of morphological parameters, the fracture ratios, and the fractal fragmentation ...
Influences of water filling timing on the deformation …
— The extent of deformation is relatively large during the later water filling and constant load stage, and the injection of water has a noticeable impact on the deformation of the crushed gangue. In the process of coal gangue compression, both the re-crushing of broken gangue and the compaction of broken gangue particles occur.
Study on the propagation characteristics of methane-air
— Methane-air explosion is one of the major disasters in industrial process. The explosion strength could be influenced by the crushed coal gangue, which is widely distributed in coal mine gob and ...
Experimental study on permeability of crushed gangues …
— After stage II, the permeability of crushed gangue decreases to the magnitude of 10 ... Poisson's ratio and elasticity modulus of loose gangues during compaction process, theoretically analyzed the compacting deformation mechanisms and measured the stress–strain and porosity–stress relationships of the saturated gangues, …
(PDF) Overview of Mineral Processing Methods
— In this process the ore is prepared and liberated, grains of the ore are mechanically separated from gangue minerals such that a concentrate containing most of the mineral is produced together ...
Experimental study on permeability of crushed gangues …
— We test the permeability of crushed gangues with six different particle sizes. We analyze the relationship between pressure gradient and seepage velocity. We …