In response to China's "double carbon" strategic goal, the problem of large emissions of coal gangue and low utilization rate of gangue cemented backfill with fly ash as admixture needs to be solved urgently. Based on this, this paper uses coal gangue powder as admixture and coal gangue as coarse and fine aggregate to prepare coalganguebased green cemented filling body ...
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The feasibility of compositeactivated coal gangue (CACG) as the primary cementitious material for concrete was experimentally studied in this paper. ... the coarse crushed particles were placed into a ball mill for grinding until milled powder passed through a mm sieve, at which time the residue was less than 8%. Finally, the coal gangue ...
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Coal gangue is a kind of solid waste produced in the coal mining and preparation. Abundant SiO 2 and Al 2 O 3 are contained in coal gangue, which has potential cementitious activity. Therefore, the preparation of cementitious materials from coal gangue powder has broad application prospects.
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Using highalumina coal gangue, iron concentrate powder, and coke powder as raw materials, the FeSialon composite dense material was prepared by carbothermal reduction nitriding method at °C for 4 hours. It was found that the coke content exceeded 10% 1. The FeSialon dense material prepared at 1500℃ for 4 hours has the most ...
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All the calcined CG was ground by a ball mill into powder with a specific area of 600 m 2 •kg −1700 m 2 •kg −1 (tested by Brinell gas specific surface area tester). ... the negative influence of coal gangue powder on the working performance of the cement system could be eliminated at a certain temperature or for sufficient time, to ...
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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 accumulated more than 7 billion tons [5], [6], and accordingly, coal gangue is one of the mining solid wastes with the largest emissions in China.
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Waste discharge and surface damage are the unavoidable consequences of coal mining. However, filling waste into goaf can help reuse waste materials and protect the surface environment. In this paper, it is proposed to fill coal mine goaf with ganguebased cemented backfill material (GCBM), while the rheological and mechanical performances of GCBM influence the filling effect. A method that ...
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Vertical roller mill equipment is not only a righthand assistant for solid waste residue projects such as coal gangue, slag, water slag and fly ash, but also an important equipment to promote the solid waste residue market to realize the value of adopt a new type of Vertical roller mill equipment, which is a professional grinding mill with energy conservation and environmental ...
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Fly ash is a solid residue discharged from flue gas after coal combustion. It is a solid particle formed after the process of decomposition, sintering and melting of coal during combustion. This is a fine solid particle with a typical particle size between and mm. The most widely used fly ash is in the field of cement manufacturing.
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By changing the activation ratio of the admixture coal gangue powder and combining macroexperiments and microexperiments, Qiu et al. [14] analyzed the mechanism of the efect of activated coal ...
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Ammonium salt roasting： g coal gangue powder and g ammonium salt were weighed, mixed in an agate ... 10 mL of the above solution was mixed with coal gangue powder ( g) and then added to a planetary ball mill for grinding for 5 min at 2000 rpm. Leaching test： 20 ml of m deionised water or ammonium salt solution (1 g: 20 mL ...
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Vertical mill for coal gangue powder mill. Vertical roller mill equipment is not only a righthand assistant for solid waste residue projects such as coal gangue, slag, water slag and fly ash, but also an important equipment to promote the solid waste residue market to realize the value of recycling. Guikuang adopts a new type of Vertical ...
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Based on the above research results, it can be deduced that although the efficient utilization of coal gangue has received attention from experts and scholars in different fields[6 ... Forssberg E. Prediction of product size distributions for a stirred ball mill[J]. Powder Technology, 1995, 84 (2): 101106. doi: /(95)02990J ...
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The coal gangue powder was calcined in a muff furnac e at a . ... crusher, ground by a small ball mill and calcined in a muffle furnace at 700 °C fo r 2 h (Figure 1). Figure 1.
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The principle of CGG preparation is to grind CG mechanically into coal gangue powder (CGP) to produce certain activity. CGP shows high activity due to the SiO bond fracture. ... (SEM) image of calcined CG powder. After the ballmill grinding and calcination, CG powder particles are dense and smooth at the surface, with pores and prismatic ...
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This utilization method must use the CLUM vertical roller mill to grind the coal gangue into coal gangue powder. Coal gangue grinding powder can be used in coal gangue making bricks, cement making, light aggregate production, coal gangue blocks and so on. The process of making bricks from coal gangue is basically the same as that of clay bricks ...
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The gangue was ground in a planetary ball mill at 300 rpm for 60 min. The apparent density of the calcined GP was 2575 kg/m 3, and the ... Guan X. Study on the influence mechanism of activated coal gangue powder on the properties of filling body. Constr. Buuld. Master. 2022; 345:128071. doi: / [Google ...
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durability of concrete with 40 and 50% content of CG and CGS. will be studied (Osborne believes that when 60% gasi. slag is used instead of Portland cement to produce concrete, the. resistance to ...
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Gangue slurry filling technology in goaf. Gangue slurry pipeline filling technology refers to the coalbased solid waste produced in the production process of coal mines or power plants made into powder with a certain particle size by crushing, grinding and other technical means and then mixed with water in a specific proportion to form a slurry.
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The gangue used in this study was unburnt gangue obtained from the Ningxia region of China. It was crushed into small pieces by a jaw crusher and then screened to a particle size of less than mm. The gangue was ground in a planetary ball mill at 300 rpm for 60 min. The apparent density of the calcined GP was 2575 kg/m3, and the fly ash ...
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To improve the reactivity of raw materials, the commonly used methods are mechanical grinding and calcination. Mechanical grinding is a physical method of mechanically breaking or grinding raw materials using crushers, pulverizers, or ball mills. For example, coal gangue powder with particle size less than 80μm has better reactivity.
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Limestone with coal gangue, tailing slag, etc. as raw materials is crushed, screened and ground to form ultrafine modified mineral powder, calcined into quicklime with a calcium content of more than 57%, and then ground into nanoscale ultrafine whitening stone powder. 20% of specific PE, PP and other additives are processed by special ...
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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 offer an alternative to bauxite as a source of alumina. Mechanically modification by grinding is an effective activation method to improve alumina recovery from coal gangue.
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The coal gangue adopts composite dry coal preparation, hydrocyclone and heavy medium separation. When the coal content is more than 20%, the coal can be recovered by coal preparation. In this way, HLM vertical mill must be used to grind coal gangue into coal gangue powder. (3) Coal gangue grinding powder is used in building materials
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The coal gangue is one of the most abundant industrial solid wastes and ... ground them up to 200 meshes in the mill. 3 ... Grouting test specimen preparing Coal gangue powder (600 ~ 700 calcined and fine grinded), cement, aggregate, expansive ℃ agent and additives were blended together after weighing to get the dry mixtures. The water ...
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Traditional Coal Gangue Separation Process and Equipment. Water washing and dry coal preparation are the main parts of coal preparation. Spiral separation, jigging, heavy medium separation, and other processes are water washing processes, which have the advantages of mature technology, high separation accuracy, and large processing capacity (Majumder, Barnwal, and Ramakrishnan Citation 2004).
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