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Firstly, the grain composition of coal gangue was estimated through the sieving method, then the representative grading curve was drawn through the statistics method of coarse grain content, and lastly the relationship between the repose angle and grain grading was studied by piling up coal gangue with different mix proportion.


coal gangue from "Linxi" mine and fly ash from nearby power plant, ordinary Portland cement, and water con- forming to ASTM C150. e density of coal gangue is


The data in the table was the percentage of fine gangue, medium gangue and large gangue in the total aggregate quality. And each group was named by fine gangue ratio. The mineral admixture was light gray secondary low-calcium fly ash with a surface area of 637 m 2 /kg. The cementitious material was P.O 42.5 cement with a surface area of 342 m 2 ...


The large proportion of gangue minerals present in platinum bearing ores in South Africa provides challenges to the flotation and downstream processes. In order to take effective measures to reduce their recovery in flotation, an understanding of the mechanisms and factors influencing their behaviour is needed. Typical gangue


Mix proportion of gangue concrete. No. Water cement ratio Mix proportion Water Cement Fine aggregate Coarse aggregate 1 0.3 185 616 570 929 2 0.4 185 463 628 1024 3 0.5 185 370 663 1082 Table 3. Test design group. Specimen design Water cement ratio Crack width Curing temperature 1 0.3, 0.4, 0.5 0 mm 10 2 25 3 45 4 0.05 - 0.12 mm ...


The gradation improved, and the weight percentage of the particles smaller than 4.75 mm was larger than 50%, resulting in better physical and mechanical behavior of the coal gangue filling. The coal gangue filling bearing capacity and anti-deformation …


Under ultrasonic condition, surfactant capacity adsorbed on gangue decreased in the presence of Ca 2+, but the addition of Ca 2+ could inhibit surfactant desorption. However, in the raw coal, the surfactants could be removed from gangue surface under ultrasonic and Ca 2+ because of the low proportion of gangue in raw coal and weaker adsorption ...


A 20% proportion of polyvinyl chloride showed the most significant promotion of co-combustion, with a maximum coupling coefficient of 0.00318, which was 1.11 and 1.35 times greater than that of 50% and 80% proportions, respectively. Co-combustion can reduce the activation energy of coal gangue during the initial and end stages.


With the determined mass proportion of coal gangue, fly ash, and silicate cement, the orthogonal test was carried out with three factors including gypsum content, the content of early strength agent (Na 2 SO 4), and the mass concentration, and at three levels. The factors affecting paste flow characteristics were determined by range analysis ...


To explore the effects of phytoremediation on gangue and coal ash resulted from coal mining and using waste, the effects of different ratios of coal ash and coal gangue mixed substrates on the growth of alfalfa (Medicago sativa) and pH, EC of substrates after planting in pot were studied. The results showed that the growth of alfalfa of T4:6 (subscript numbers represented the mass ratio of coal...


The process of removal of gangue particles from ore to increase the percentage of metal in ore is called enrichment of ore. The processes used for removing the impurities from ores depend on the difference between physical or chemical properties of the ore and of the impurities.


Meanwhile, the effects of different proportions of biomass in the mixture on the gas products of coal gangue pyrolysis were analyzed. It was found that the addition of biomass to coal gangue could promote the release of gaseous organic matter during pyrolysis. CG75PS25 only has a synergistic effect in the high temperature zone greater than 600 °C.


Glass–ceramic s were fabricated at a relatively low temperature by incorporating coal gangue, waste quartz sand and sintering additives in different proportions. Sintering and the ing behavior of the s were studied using thermal, X-ray techniques and morphological characterization, followed with physical and mechanical properties measurements. The effects of coal gangue …


It can also be used for gangue as the proportion of a non-valuable substance, but generally, when we use the term grade, we mean the grade of a valuable element. For example, a copper ore grade of 1% means that in 100 tons of the ore, we have 1 ton of copper. If the copper ore contains 40 tons of calcite gangue, we can also say 40% of calcite ...


The principle variation in pellet mineralogy is in the proportion of gangue phases present in the product. These will vary depending upon the pellet feed material and the type and the amount of any additives to feed such as limestone, dolomite, olivine and bentonite etc. The mosaic image of cross section of a pellet is shown in Fig 1. The ...


Gangue minerals such as biotite and chlorite consume acid together with copper-bearing minerals such as ... proportions of the pure minerals in the pure mineral blend. The predicted acid consumption trend fits the measured acid consumption trend reasonably well. However, it should be clear that the acid consumption measured ...


Exchangeable and carbonate fractions of Cr and Pb were a large proportion of the total and should attract great attention. Potential ecological risk was at strong level (light black) and was up to very strong level (deep black) because of Cd. But Cr had contributed the most for gray gangue…


Exchangeable and carbonate fractions of Cr and Pb were a large proportion of the total and should attract great attention. Potential ecological risk was at strong level (light black) and was up to very strong level (deep black) because of Cd. But Cr had contributed the most for gray gangue, which was 71% of the total.


The percentage of coal gangue is is an important index by which to evaluate the working condition of coal mining machinery, and it has an obvious influence on the wear of the middle plate.


reinforced coal gangue ceramsite concrete eISSN 2051-3305 Received on 11th December 2019 Revised 7th August 2020 Accepted on 1st September 2020 ... 2.2.2 Mix proportion of CGCC: The mix proportion of CGCC was designed according to 'Specification for mix proportion design of ordinary concrete' (JGJ 55-2011) [14]. The PP fibre was added


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Gangue - Wikipedia

For example, in 2002, about 130 million tons of gangue were produced per year from coal mining in China. This, mixed with the 60 million tons of coal mud also produced, could be used for power generation; and the coal mining gangue could be combined with …


Aggregate stability and organic carbon distribution in reconstruction soil filled with gangue from coal mining areas book. ... Results showed that the composition proportion of the mechanical stable aggregate was in shape of "W" with decreasing size fraction, the percentage of size fraction >3.2 mm accounted the largest proportion and ...


Mix proportion of gangue concrete. Table 3. Test design group. resistance of gangue concrete decreases. This is because the larger the water cement ratio means that the amount of cement per unit volume decreases, resulting in the reduction of hydration products and the increase of capillary pipelines at the interface between cement paste and ...


The large proportion of gangue minerals present in platinum bearing ores in South Africa provides challenges to the flotation and downstream processes. In order to take effective measures to ...


In view to the gangue characteristic and the roadbed padding's essential requirements, the improving experiments for gangues mix the clay in four coal mines along the route to the Jidong highway Huojia section were carried out. It has been studied that the compaction test, the oedometric test, the California bearing test and the direct shear test for coal gangues mixed with clay and them in ...


However, there were significant differences in terms of the type and proportion of the gangue minerals present in both ores. Ore A had higher quartz and calcite contents compared to ore B. In fact, the quartz and calcite contents of ore A were approximately eleven times and twice those of ore B, respectively.


On the other hand, the heavily mineralized gangue pieces are found in the sink product, which is not generally high enough grade to be a finished product but is usually ground finer for further concentration. In operation the role of Sink and Float is to reject a substantial proportion of the gangue as a worthless tailing of coarse size.


In China, the production of coal gangue has accumulated more than 5 billion tons and is still rising at an annual rate of 300–350 million tons. The total gangue production in China is expected to approximately 729 million tons by 2020, becoming a primary environmental concern ( Ge et al., 2010 ).


The study of the different proportions of coal gangue, fly ash, and rock and soil stripping material as topsoil substitute materials provide support for reclamation work in mining areas where ...


1.2 Expression of Gangue Distributions with Mathematical Method It is mentioned that the cutting force on the cutter due to gangue mineral can be obtained according to its position. Therefore, the I MCF is calculable when the positions of all gangue minerals in the same plane are identified. However, to date, there is no reference


Gangue is a kind of black or gray rock with low carbon content. It is inherently contained in the raw coal in the current coal mining process. Gangue is usually treated as waste in the coal industry, although gangue can be made into construction materials. The proportion of gangue in different


Coal gangue and sunflower straw biomass from Xilingguole, Inner Mongolia, China and Ulanqab Tsining District, Inner Mongolia, China, respectively, were burned separately and mixed in different proportions. The synergistic effect was analyzed by comparing the actual mixed combustion curve with the theoretical mixed combustion curve.


The mix proportion of CGCC was designed according to 'Specification for mix proportion design of ordinary concrete' (JGJ 55-2011) . The PP fibre was added into CGCC by 0, 0.6, 0.9, and 1.2 kg m −3. The details of the mix proportion are given in Table 2.


then simulates to eluviate the mixtures of adsorption fly ash and gangue and gains the best proportion of the two kinds of castoff when they fill up mine subsidence area; ,;