In this paper, coal gangue was used as raw material to make an activated coal gangue powder (ACGP) as an auxiliary cementitious material via microwave The ratio of gangue slurry is coal gangue to mine water = 7:3, and the mass fraction of gangue slurry is 70%. The grouting pump used in this experiment is a Technology and engineering test of filling goaf with coal gangue
احصل على السعر
Keywords Tailings powder Coal gangue-based Cementitious ller Modication Solid waste Microstructure Introduction China’s energy sources are Coal gangue is a solid waste produced during coal production, and it accounts for 10%∼25% of the material produced in coal mining. China alone has Preparation of coal gangue-slag-fly ash geopolymer
احصل على السعر
The objective of this paper is to improve the resource utilization rate of coal gangue, and study the influence mechanism of activated coal gangue powder (CGP) on The simulated grouting filling material used in the test was prepared by gangue from Hongqinghe Coal Mine and tap water. The gangue was crushed and sieved Mining-induced off-layer space evolution law and gangue
احصل على السعر
The objective of this paper is to improve the resource utilization rate of coal gangue, and study the influence mechanism of activated coal gangue powder (CGP) on By changing the activation ratio of the admixture coal gangue powder and combining macroexperiments and microexperiments, Qiu et al. [14] analyzed the Study on the influence mechanism of activated coal gangue powder
احصل على السعر
Coal gangue, a type of kaolinite clay in coal measures, is one of the largest categories of solid industrial wastes in China. Alumina extraction from coal gangue could Activation of coal gangue is necessary as kaolinite, the major aluminum-containing component, is chemically inert. Thermal activation is a common method by which coal gangue has been activated that is simple to implement but relatively inefficient. The percentage recovery of alumina after thermal activation typically fails to reach 70% [8].Improved extraction of alumina from coal gangue by surface
احصل على السعر
Pyrite is common in coal gangue formed in a reduced environment and has a significant influence on the recycling utilization of coal gangue. Four types of pyrite with different structures and morphologies, namely octahedral pyrite framboid, pentagonal dodecahedral pyrite framboid, irregular grain pyrite, and euhedral octahedral crystalline Coal gangue is one of the industrial solid wastes that may harm the human body through the ecosystem for a long time. Using coal gangue in geopolymer preparation can effectively reduce cement output and meet the sustainability requirements. In this paper, the physical and chemical characteristics, including the heavy metal content, of coal Polymers Free Full-Text Activation Mechanism of Coal Gangue
احصل على السعر
The coal gangue was dried, and then 500 g of the coal gangue was ground using a GJ-1000B type grinding machine for 4 min. ② The ground powder was placed into a grinding tank with a GMB/B ball mill at a 3:1 ratio of materials and steel balls.The feasibility of composite-activated coal gangue (CACG) as the primary cementitious material for concrete was experimentally studied in this paper. The effects of concrete strength grade on slump and slump flow, compressive strength, splitting tensile strength, axial compressive strength, elastic modulus, and drying shrinkage of alkali Mechanical Properties and Drying Shrinkage of Alkali-Activated Coal
احصل على السعر
Coal gangue can be made into coal gangue powder by grinding with an ultrafine powder mill. Coal gangue powder is widely used in the construction field. 1. Brick making with coal gangue powder. Coal gangue powder is the raw material for making solid gangue bricks, porous load-bearing gangue bricks, hollow gangue bricks and other brick The improvement mechanism of coal gangue powder and polyester fiber on low tempe-rature crack resistance of asphalt mixture was analyzed by SEM. Through experiments, the optimum amount of polyester fiber is 0.4% for SCB specimens with no pre-cut, and the optimum replacement rate of coal gangue powder is 50%; for SCB 煤矸石粉/聚酯纤维沥青混合料低温抗裂性研究
احصل على السعر
Keywords Tailings powder Coal gangue-based Cementitious ller Modication Solid waste Microstructure Introduction China’s energy sources are dominated by coal. In 2021, the 5 mm or less, using GMU/B ball mill grinding 120 min to powder after being put into a 1.33 KW industrial micro-wave oven (2450 MHz, 380 V) for microwaveCoal gangue (CG) is an environmental waste that faces an urgent demand for disposal in China. The utilization of CG in construction materials has broad application prospects and gained increasing interest. However, the poor compatibility of polycarboxylate superplasticizer (PCE) with CG powder hinders its efficiency in a wide An alternative approach to improve the compatibility of PCE
احصل على السعر
The replacement of cement by calcined coal gangue was 20%. Aggregate was the coarse sand. Other components used the basic mix proportion. 3.1.1 Effects of calcining temperature of the coal gangue on the fluidity of cement grouting . Effects of coal gangue calcining temperature on the cement grouting material are shown in figure 3. 8.6 8.8 9 9.2Comprehensive utilization of coal gangue is of importance to sustainable development of society and economy. China has made great progress in comprehensive utilization of coal gangue in the latest 40 years since the 1960—1970's. Circulating fluidized bed (CFD) power generation using coal gangue is at the advanced level of the world.Industrial development and prospect about comprehensive
احصل على السعر
Coal Gangue Pulverizer Raymond Mill Finished product fineness: 80-325 mesh Production capacity: 1.5-100t/h It is suitable for the processing of more than 300 kinds of high-fine powder materials in non-flammable and explosive mineral, chemical, construction and other industries with Mohs hardness not greater than 7 and humidity 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 . 2 Mix raw materials (55% coal gangue and 45% iron tailings) to make particles with a diameter of 10-20 mm. 3 Put the formed CGC into a dryer, heat to 105°C, and dry for 1-2 hours.How to Recycle and Process Coal Gangue: 7 Effective Ways
احصل على السعر
Uranium is a relatively active and chemically toxic natural radionuclide, its enrichment in the environment poses a serious threat to human health and ecosystems. It is necessary to dispose the uranium contaminated soil safely and efficiently. In this study, the effect of coal gangue-based geopolymers on the solidification of uranium-contaminated After the ball-mill grinding and calcination, CG powder particles are dense and smooth at the surface, with pores and prismatic shape. After heating, calcined CG powder becomes an irregular and porous structure, which may be caused by kaolinite hydroxylation and the phase change of the metakaolin. Preparation Process of Coal Gangue PowderActivation Mechanism of Coal Gangue and Its Impact on the
احصل على السعر
Asphalt mixtures was prepared with different polyester fiber contents(0%, 030%, 035%, 040%, 045%, 050%) and different coal gangue powder replacement rates(0%, 25%, 50%, 75%, 100%). The semicircular bending fracture(SCB) test was carried out to study the decay law of coal gangue powder/polyester fiber asphalt mixture under the Ammonium salt roasting：0.5 g coal gangue powder and 1.0 g ammonium salt were weighed, mixed in an agate 10 mL of the above solution was mixed with coal gangue powder (0.5 g) and then added to a planetary ball mill for grinding for 5 min at 2000 rpm. Leaching test： 20 ml of 0.4 m deionised water or ammonium salt solution (1 g: 20 An exploratory study on strategic metal recovery of coal gangue
احصل على السعر
Coal gangue is a solid waste produced during raw coal extraction and washing; makes up approximately 10-20% of coal production; and is a mixed mineral composed of various minerals, water and aThe coal gangue was finely grounded by the vertical planetary mill (YXQM-4L) for better activity. The rotation speed is set to 600 r/min, and the grinding time is 30 min. The particle size distribution of CG is showed in Figure 2. It can be seen in Figure 2B that after 30 min of milling, the particle size of coal gangue powder is about 20 μmFrontiers Study on the effect of activated coal gangue on
احصل على السعر
Results showed that mechanical ball milling, microwave, and chemical activator could activate coal gangue, and the composite activation effect was the best. The fineness of the coal gangue powder
احصل على السعر
منزل