Research on the Identification Mechanism of Coal Gangue Based on the Differences of Mineral Components

Abstract

For coal and gangue, intelligent sorting processes for separation, the use of coal and gangue mineral components with different fundamental differences, and the study of different properties of minerals and coal with different scales and density regarding the gray value change law are presented. The results show that the gray value of single minerals and mixed minerals gradually decreases with the increase of their thickness and density. The greater the density of minerals, the smaller the gray value at the same thickness, and the same rule applies to different coal ranks. Via regression analysis methods, the values of the regression equation parameter a of pure minerals for graphite, quartz, kaolinite, and montmorillonite are 59. 25, 65.69, 61.61, and 58.02 in the high-energy region, respectively. In the low-energy region, they are 174. 95, 177.31, 186.95, and 161.81. For the regression equation parameter of mixed minerals in the form of two mixed minerals (graphite and quartz, kaolinite, or montmorillonite) and three kinds of mineral mixing (graphite−kaolinite and quartz; graphite−montmorillonite and quartz; graphite−kaolinite and montmorillonite),

Study on the Influence of Particle Size Distribution on the Separation of Pyrite from Coal Gangue by Jigging

“…The experimental coal gangue is sourced from Ningwu, Shanxi, and its primary chemical components [32] The total iron content (TFe) is 5.36%, indicating that it belongs to medium-sulfur coal gangue [33]. The main minerals [34,35] present in coal gangue include quartz, kaolinite, dolomite, and pyrite, along with a small amount of calcite as depicted in Figure 1. Table 2 displays the densities of these primary minerals.…”

Properties and Microstructure of an Interfacial Transition Zone Enhanced by Silica Fume in Concrete Prepared with Coal Gangue as an Aggregate

“…CG has a certain amount of application in the construction material, 8 backfill, 9 chemical industry, 10 power generation, 11 chemical fertilizer, 12 but the CG consumption is still much lower than the output in practice resulting in a continuous accumulation of CG, 13 especially in the area of western China. 14 Producing the concrete prepared with CG as an aggregate (CPCGA) is one of the most promising solution for the reason that concrete is currently the largest construction material in the world with approach 17.5 billion tons global annual consumption. 15−17 Generally, the aggregate volume takes up around 70−80% of the concrete volume, 18 which plays an essential role as a "skeleton" in the concrete structures.…”