Coal production process produces coal gangue

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Coal based Direct Reduction Rotary Kiln Process – IspatGuru

The metallic iron in this process is produced by the reduction of iron oxide below the fusion temperature of iron ore (1535 deg C) by utilizing carbonaceous material present in the non-coking coal. ... no other chemical change takes place during the direct reduction process. The gangue material in DRI, originating from the iron ore, namely ...

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The structural and surface properties of natural and modified coal gangue

Coal gangue is produced during the coal mining process and the coal enrichment stage in coal processing plants [1]. In recent years, China has accounted for 50.8 % of the global coal production [2

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Full article: A review of intelligent coal gangue separation …

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 …

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The Relationship between Acid Production and the …

Coal gangue is a solid waste formed during coal production, and the acid mine drainage it generates during open-pit storage severely pollutes the ecological environment of mining areas. Microorganisms play a crucial catalytic role in acidification, and their species and gene functions change during the oxidation process of coal …

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Static and Dynamic Leaching Studies on Coal Gangue

Among the industrial solid wastes, coal gangue is one of the largest and most harmful wastes generated from the coal production process . Currently, coal gangue is loosely stockpiled at the mining sites and annual accumulative stockpiles of coal gangue in India are to an extent of 550 million tonnes . The disposal of such a large …

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Synergistic performance of microwave-activated coal gangue …

The research on using microwave-activated coal gangue to produce LC 3 not only reduces the carbon emissions and costs of cement production but also addresses the environmental pollution caused by coal gangue. ... the next phase will entail scaling up the production process and evaluating the feasibility of industrial application. This phase ...

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Integrated utilization of coal gangue for synthesis of β …

China is rich in coal resources, which account for more than 70% of its energy production and consumption. Meanwhile, a large amount of coal gangue is generated by the production process, i.e., every ton of raw coal mined produces 150–250 kg of coal gangue. About 4 billion tons of coal gangue has been stored in China over time [1,2].

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The real-time detection method for coal gangue based on

To address the issues of complex algorithm models, poor accuracy, and low real-time performance in the coal industry's coal gangue sorting, a lightweight real-time detection method called YOLOv8s-GSC is proposed based on the characteristics of coal gangue. This method incorporates the ghost module into the YOLOv8s backbone …

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Comprehensive utilization and environmental risks of coal gangue…

Investigation into trace element partitioning behavior from a coal gangue-fired power plant in Shanxi province, China, has been conducted and showed that Hg, As, Be, and Cd were highly volatile elements in the combustion of coalgangue, which were notably enriched in fly ash and may be emitted into the environment via the gas phase.

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Underground Disposal of Coal Gangue Backfill in China

China's total coal production in 2021 exceeded 4.13 billion tons, 52% of the world's total. Coal gangue, a solid waste of coal mining accounts for 15–20% of coal production, when directly discharged on the ground surface as waste heaps, it occupies large areas of land and cause environmental pollution. This paper summarizes the …

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Research progress of high-value utilization of coal gangue …

The coal gangue in China is the core field of bulk solid waste comprehensive utilization due to its massive stock and emission, high concentration of output, small proportion of high-value-added utilization, and outstanding environmental impact. Hence, the prospect of resource utilization of coal gangue is broad. The existing disposal …

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A facile green and cost-effective manufacturing process from coal …

Utilization of high-filler coal gangue (CG) to produce cost-effective composites is a promising strategy. To clarify the impact of high-filled CG on composite preparation and performance, in this research, the composite was prepared from CG and polyethylene (PE) through physical mixing and then hot-pressing.

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The Relationship between Acid Production and the …

Coal gangue is a solid waste formed during coal production, and the acid mine drainage it generates during open-pit storage severely pollutes the ecological environment of mining areas. Microorganisms play a crucial catalytic role in acidification, and their species and gene functions change during the oxidation process of coal gangue.

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Coal Gangue: Composition, Processing, Use And Recycling

Coal gangue power generation Coal gangue grinding adopts fluidized bed technology. When the carbon content is greater than 20%, it can be used as energy and can be used to generate electricity. Recycling of coal and pyrite Coal gangue adopts composite dry coal preparation, cyclone, and heavy medium separation. When the coal …

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Sustainable and clean utilization of coal gangue: …

Coal gangue, which is the main source of citrate-soluble silicon fertilizer, is a solid waste produced in the process of coal processing and utilization. Due to the accumulation of a large amount of coal gangue and the failure to fully utilize or dispose it, it caused problems on the environment

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Using Chinese Coal Gangue as an Ecological Aggregate and …

Coal gangue is a kind of industrial solid waste with serious ecological and environmental implications. Producing concrete with coal gangue aggregate is one of the green sustainable development requirements. This paper reviews the properties and preparation methods of Chinese gangue aggregate, studies the influence of gangue …

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Study on the performance of coal gangue ceramsite steel …

1. Introduction. Coal gangue (CG) is an industrial solid waste produced in the process of coal production. The global coal industry produces about 350 million tons of inactive coal gangue every year. 1.75 billion tons of coal gangue waste has been accumulated in landfills for decades in Europe [1, 2].At present, China's coal gangue has exceeded 7 …

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How to Recycle and Process Coal Gangue: 7 Effective Ways

It solves the problems of weak spheroidization of iron tailings and difficult expansion of coal gangue. CGC production process: 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 …

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Comprehensive utilization and environmental risks of coal …

The amount of coal gangue, a by-product of coal mining and washing, is rapidly increasing with the growing trend of energy consumption. The accumulated coal …

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Cementitious properties of coal-based metakaolin prepared from coal

1. Introduction. Coal gangue is a gray-black industrial and mineral residues with low carbon content and hard texture, which is produced in the process of coal mining and producing (Sheng et al., 2023).With the rapid development of coal mining industry, coal gangue annual output accounts for 10%–25% of the annual coal output (Gao et …

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Alkali Methods for Alumina Extraction from the By-products …

Large amounts of by-products, including coal gangue, circulating fluidized bed (CFB) slag, and coal fly ash (CFA), are generated during mining, washing and burning of high alumina coal (HAC). The stockpile of these by-products of HAC will cause the pollution of air, water and soil. Meanwhile, the unbalanced regional distribution of …

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Study on the thermal reaction characteristics and kinetics of coal …

Significant synergistic effects exist in the co-combustion heat release process of coal and coal gangue. ... the main solid waste in coal mining (accounting for about 10%–15 % of the total coal production) ... and new free radicals will be constantly produced from coal-oxygen reactions. At the initial heating-up stage, active structures in ...

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Separation and Recovery of Valuable Carbon

Coal is one of the main energy sources in many countries, and coal gangue (CG) is a kind of gray-black rock produced in the process of coal processing and washing, with low carbon content and harder than coal, generally accounting for 15%–20% of coal production in China and 25% of industrial waste emissions.

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Co-combustion and emission characteristics of coal gangue …

Coal gangue is a problematic by-product generated from the process of mining and beneficiation of coal. It approximately accounts for 10–15 mass % of coal production [].Huge quantities of coal gangue has been stockpiled during decades of coal production and cause severe environmental impacts, such as acid drainage, heavy …

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Pore structure evaluation of cementing composites blended with coal …

Coal gangue (CG) is the by-product during the coal excavation, mining and washing process. The average production of CG is approximately 10–15% of raw coal production in China [[2], [3], [4]].According to the statistics of the National Development and Reform Commission (NDRC) of China in 2014, the total accumulative stockpiles of …

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Investigation on coal/coal gangue mixtures co-combustion …

The consumption and production of coal in China is the largest in the world, accounting for approximately 50 % and 47 %, respectively [1]. Coal gangue (CG) is a type of low-carbon containing solid waste generated during coal mining activities, and accounts for approximately 10–15 % of coal production in total.

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Environmental hazards and comprehensive utilization of …

Coal gangue refers to the solid waste that is produced as a result of coal mining and coal washing processes [7]. It is a dark grey rock with lower carbon …

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Synergistic performance of microwave-activated coal gangue …

This gap in knowledge highlights the need for comprehensive studies to optimize the activation process of coal gangue, ... Addressing these research gaps is crucial for advancing the use of coal gangue in LC 3 production and promoting the ... The research on using microwave-activated coal gangue to produce LC 3 not only reduces …

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Integrated utilization of coal gangue for synthesis of β …

coal gangue is generated by the production process, i.e., every ton of raw coal mined produces 150–250 kg of coal gangue. About 4 billion tons of coal gangue has been stored in China over time ...

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Utilization of coal gangue for the production of brick

The production of coal gangue sintered bricks is an effective approach for realizing the resource utilization of coal gangue, which can also reduce damage to cultivated land due to the production ...

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Research Progress on Comprehensive Utilization …

Coal gangue is one of the largest mine solid wastes in China, and its discharge and stockpiling have caused resource waste, environmental pollution and other problems. Starting from the resource …

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Emission characteristics of volatile organic compounds from coal-, coal

Coal-fired power generation was the main way of the electricity production in China, with the amount of electricity production of 3980.5 billion Kwh, account for 74.1% of total electricity production in 2013 (China Electric Power Yearbook, 2014), and consumed 1951.77 million tons coal, almost 45.99% of the coal consumption amount in China ...

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Preparation of coal gangue ceramsite high-strength …

Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1,2,3. Generally, one ton of CG is discarded for every 10 tons of produced coal 4, 5 .

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Rapid Analysis of Composition of Coal Gangue Based on …

Coal is a significant source of energy and industrial raw materials. Among the fossil energy values, it has the most varieties and the longest history of development and use [].However, a large amount of coal gangue is produced in the process of coal production and washing.

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Extraction of alumina from alumina rich coal gangue by a …

Coal gangue is an industrial solid waste produced by coal mining and processing [1–3]. The average production of gangue accounts for 10–15% of raw coal production [4,5], making coal gangue one of the biggest solid wastes in China. At present, utilization ratio of coal gangue can reach about 60% in some countries.

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Research Progress on Comprehensive Utilization …

Starting from the resource characteristics of coal gangue, this paper systematically discusses the ways and research status of coal gangue resource utilization, mainly including: extracting and recovering …