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Preparation of a Novel Coal Gangue .
Abstract: A novel flocculant based on hybrid coal gangue-polyacrylamide (HCGPAM) has been prepared by using modified coal gangue and polyacrylamide. Factors related to the preparation such as reaction time, temperature, concentration of the polymer monomer and ratio of initiators are investigated. The product is characterized by infrared spectra (FTIR), scanning electron microscopy (SEM), X ...learn more
Hydration kinetics of cementitious materials .
To elucidate the intrinsic reaction mechanism of cementitious materials composed of red mud and coal gangue (RGC), the hydration kinetics of these cementitious materials at 20°C was investigated on the basis of the Krstulović-Dabić model. An isothermal calorimeter was used to characterize the hydration heat evolution. The results show that the hydration of RGC is controlled by the processes ...learn more
Preparation and Performance Study of .
To solve problems of surface subsidence caused by mining of coal mine and waste of resources caused by unexploited coal under the surface construction,water body and railway,it was held by the authors that a new type of cemented filling material should be used,which was prepared from composite cementitious material composed of fly ash,cement and flue gas desulphurization gypsum as .learn more
Preparation of cementitious materials without .
Download Citation | Preparation of cementitious materials without clinker using coal gangue and clay shale | The feasibility of using coal gangue and clay shale instead of cement clinker in the ...learn more
Shrinkage and Strength Properties of Coal .
Materials Preparation. Ceramsite is a main component of coal gangue ceramsite lightweight aggregate concrete and accounts for approximately 50% of its total volume. Its properties have significant influence on the performance of the concrete. The coal gangue ceramsite used in this study was produced by Chaoyang Hualong Kejian Co., Ltd, and its morphology is shown in Figure 1. This product has ...learn more
Materials | Free Full-Text | Evaluation of .
Most previous studies have focused on physical methods to improve the stability of coal gangue filling, such as controlling filling height, impact compaction, dynamic compaction, and material incorporation [20,21,22,23,24,25]; and chemical methods to increase the strength of the material by means of alkali-activated [26,27].The mechanical properties of filling materials are one of the decisive ...learn more
Energies | Free Full-Text | Experimental Study on .
Coal gangue-based geopolymer (CGGP) is one of the hot spots existing in the recycling of coal gangue resources due to its good comprehensive mechanical properties. However, the coal gangue structure is stable and reactivity is poor, so the coal gangue needs to be activated before utilization. In this paper, the microstructure changes of activated coal gangue by different mechanical and thermal ...learn more
Preparation of SiC from acid‐leached coal .
Besides, based on the carbon fiber transformation method, SiC fiber was prepared by using leached coal gangue and degreasing cotton as raw materials. Therefore, it can be concluded that leached coal gangue is a very effective and inexpensive source for preparing SiC, and more importantly, this work has important economic and social significance to realize waste recycling and control pollution.learn more
Study on the Preparation of New-type .
Coal gangue-containing cementitious materials were prepared by using desulfurized gypsum and CaO as reactive activator and using thermal activation at the low temperature of 700℃ activating the coal gangue,which was mixed with slag and cement clinker.Meanwhile,the effect of the activator and the way of mix grinding on hydrothermal alteration for the coal gangue in .learn more
The Preparation of Ultrafine Aluminium .
Modification of mineral composition is adopted to activate alumina in coal gangue,eliminate interfering factors which prevent the crystal phase from transforming and realize the complete self-pulverization of coal gangue sinter,therefore the average diameter of the self-pulverized powders is less than l μm. Aluminium is extracted from the activated coal gangue as NaAlO_2 form by using 8% ...learn more
Preparation of SiC from acid‐leached coal .
The results show that the main components in leached coal gangue are amorphous SiO 2 and carbon, which are suitable for the synthesis of SiC as raw materials. The synthesis temperature and holding time have important influence on the synthesis of SiC, and the optimum synthesis parameters for SiC are at 1550°C for 4 hours; under this condition, the yield of SiC is 78.27%, and the specific ...learn more
Effects of Corn Stalk Fly Ash (CSFA) on the .
2.2. Specimen Preparation. As shown in Table 3, a control group (C0) and four variable groups (C1, C2, C3, and C4) were established.In all five groups, the amount of fine coal gangue was 285 kg/m 3, the amount of coarse coal gangue was 665 kg/m 3, and the amount of fly ash was 380 kg/m 3.The amount of cement in the control group (C0) was 190 kg/m 3, and, in the variable .learn more
The coal production of China now ranks top in the world, and so there is the biggest coal gangue yield. Despite being used as alternative material in road, pavement, embankment, foundation, or building construction, and so forth [1, 2], most of the coal gangue is still open-air stack-stored near by the coal mines and occupies vast pieces of land leading to a series of environmental problems ...learn more
Hydrothermal Synthesis of SBA-15 Using Sodium .
Well-ordered SBA-15 was prepared with a hydrothermal route by sodium silicate derived from coal gangue. The as-prepared sample was analyzed by SAXRD, BET, TEM, and SEM, respectively. The results indicate that at a low hydrothermal temperature of 100 ∘ C the well-ordered mesoporous SBA-15 could be synthesized. The surface area, pore volume, and pore size of the sample are .learn more
Materials | Free Full-Text | Preparation and .
Title: Study on the Preparation and Performance of Alkali-activated Coal Gangue-Slag Cementitious Materials. The paper investigates the influence of slag substitution and l/s ratio on performance of alkali-activated Coal Gangue-Slag paste. A topic is of interest for the readers of Materials. However, interpretation of results is limited and there are many questions with regard to test methods ...learn more
CN1450026A - Building material with high .
The present invention relates to a building material with high blended gangue and its production method. Its composition contains 20-60% of gangue, 78-35 % of rock and 2-5% of foaming agent, and its production method includes the following steps: preparing raw materials, according to the proportion, respectively breaking them, stirring them, grinding, sieving with 100 meshes, .learn more
PAPER OPEN ACCESS Related content Feasible Recycling of ...
Cementitious Property of Coal Gangue with High Iron and Silica Contents Hong Wu, Yu Li, Min Teng et al. -Effects of Coal Gangue on Cement Grouting Material Properties J Y Liu and H X Chen-Recent citations Effect of thermochemical activation of clay raw materials on phase formation, microstructure and properties of aluminosilicate proppants T.V. Vakalova et al-This content was downloaded from ...learn more
Chinese Journal of Materials Research
Hydration Characteristics of Intermediate-Calcium Based Cementitious Materials from Red Mud and Coal Gangue: Na ZHANG 1,Xiaoming LIU 2, ** (),Henghu SUN 1, 3: 1. Green Construction Materials and Circulation Economy Center, Architectural Design and Research Institute of Tsinghua University Co., Ltd., Beijing 100084 2. School of Metallurgical and Ecological Engineering, University of Science and ...learn more
Mechanical properties and microstructures of .
The compressive strength of the alkaline cementitious material with value of 42.5 MPa is obtained when the burned coal gangue is mixed water glass with modulus of 1.23 (mass ratio of solution to ...learn more
Preparation and characterization of .
The results showed that the glass–ceramic foam with 40 % coal gangue exhibited its optimal performances with the lowest porosity and adequate strength. Combined with low cost, excellent comprehensive performances and environment-friendly characteristic, therefore, the new development in preparation of glass–ceramic foams will promise a wide application in energy-saving insulation material ...learn more
Preparation of Coal Gangue Cement Mortar | .
Many researches on coal gangue are aimed at increasing its activity by many methods together such as thermal, mechanical and chemical. The methods are so complex that they are difficult to be adopted by some companies. In this paper, considering the low-strength requirement of cement mortar, the activity of coal gangue is more evidently shown by Ca(OH)2 activator.learn more
Preparation and characterization of coal gangue .
The calcined coal gangue was mixed with alkaline solutions to prepare amorphous alkali-aluminosilicate cementitious materials, in which the cementitious materials prepared by modified water glass ...learn more
Utilization of coal gangue for the production of .
Coal gangue, an industrial solid waste discarded from coal mining and processing, was used as the sole raw material to prepare brick. The coal gangue was crushed, homogenized, milled and then pressed into green compacts. The dried compacts were sintered at different temperatures for 2 h. The obtained brick samples were characterized with X-ray diffraction, scanning electron .learn more
Preparation of high-performance cementitious .
15.10.2017· Chemical reagents (Al 2 O 3,CaCO 3,CaSO 4 ·2H 2 O) and industrial raw materials (coal gangue, aluminum slag, FGD gypsum, carbide slag) were used to prepare clinkers. Chemical reagents were used as a reference material to manufacture a pure calcium sulfoaluminate phase under the same constraints. The reagent-grade chemicals used for the synthesis of SAC clinkers were calcium .learn more