— 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.
— 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 …
— 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 …
— 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 …
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
— 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 ...
— This study reveals the internal mechanism of macro deformation of crushed gangue under the triaxial compression from the perspective of the mesoscopic fabric …
mineral processing, art of treating crude ores and mineral products in order to separate the valuable minerals from the waste rock, or gangue. It is the first process that most ores undergo after mining in order to provide a …
— 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.In engineering practice, CGPM is generally circularly compacted first by the compaction machine to reduce its compressibility.However, a systematic …
— 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 ...
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 …
— The results show that the confined compaction deformation process of crushed gangue can be divided into three stages: the rapid compaction stage, crushing …
— In solid backfilling coal mining (SBCM), the crushed gangue backfilling material (CGBM) is generally compacted circularly by a compaction machine in order to reduce its compressibility. In this cyclic compaction process, the particles are crushed, which has a significant effect on the deformation resistance of CGBM. However, the …
Learn about the steps involved in iron ore processing, from crushing and grinding to separation. Contact Multotec experts for guidance on iron processing. Multotec Login. Multotec Login; Multotec Group. ... Once the ore has been crushed, it is diverted to a stockpile. The aim of this step is to ensure a smooth crushing process and minimise ...
Downloadable! The crushed gangue materials which are filled into the goaf in solid-backfilling coal mining become the main body of bearing the overburden after the tamping process. Its resistance to deformation is the key to control overburden movement and surface subsidence. Particle breakage affects the resistance to deformation of filling …
— 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 …
— We test the permeability of crushed gangues with six different particle sizes. We analyze the relationship between pressure gradient and seepage velocity. We …
Graded crushed gangue, in the compaction process, will be accompanied by the re-crushing of the particles, and the re-crushing of the particles will, in turn, affect its
— Introduction. In the process of coal mining, the discharge of crushed gangue accounts for 15–20% of coal output. At present, the crushed gangue accumulated on the ground of mining areas in China has exceeded 6 billion tons, becoming the largest industrial solid waste in China 1 – 3.The accumulation of crushed gangue on the ground causes a …
— We designed a crushed rock compaction permeation apparatus and a seepage circuit. • We test the permeability of crushed gangues with six different particle …
— 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 ...
— 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 ...
— In the process of coal mining, the discharge of crushed gangue accounts for 15–20% of coal output. At present, the crushed gangue accumulated on the ground of mining areas in China has exceeded ...
— AE experimental study on crushed gangue under different loading conditions and analyzed the corresponding relationship between AE parameters and strain–stress curves. According to Xin et al. [46], there were notable differences in each compression stage of the crushed ... evolution law of the compaction process of crushed rocks in …
— 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 ...
— 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 ...
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.
— 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 …
— 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 ...
— 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 ...
— 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 ...
Other articles where gangue is discussed: copper processing: Mineral processing: …from the waste materials, or gangue. In cases where the next step is leaching (most frequently in the case of oxide ores), complete liberation of the copper minerals is not always necessary; the ore needs to be crushed and ground only to the extent required to expose the …
— 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 ...
— 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 ...
— 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
— 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 ...
