coal gangue cement production

In general senses, replacing cement with alternative composite materials such as coal gangue or ashes from the industrial by-product, etc. Will induce environmental benefits based on two main assumptions that. 1) no environmental burden coming from the upstream production of main products (i.e., coal production and steelmaking …

Coal gangue is used to replace cement clinker to prepare cementitious material via activation techniques. Thus, the solid waste can be effectively disposed, and the carbon emission from cement production processes can be significantly reduced. In this paper, the product transformation, reaction mechanism, and thermal activation kinetics of coal …

The drainage modulus of the subsurface water in this area is 0.01 m-3 s km −2 when the drainage ditch is designed with a concrete that uses fly ash and coal gangue. Therefore, this concrete drainage ditch can be widely applied in coal mining subsidence areas with high groundwater levels, for which the modulus of subsurface drainage does …

The higher dissolution rates of alumina and silica indicating that calcined coal gangue was involved in cement hydration to a greater extent, therefore has a higher gelling activity . In summary, ... Suspension calcination effectively converted low-quality coal gangue to an activated material for cement production. The mortar specimens …

The accumulation of coal gangue not only occupies a vast amount of land but also poses a serious threat to the ecological environment [19, 20]. However, coal gangue contains abundant aluminosilicate components, such as Al 2 O 3 and SiO 2, which have the potential to be used as raw materials for alkali-activated cementitious materials …

Coal gangue concrete is not recommended to be used in subsurface structures, as its water absorption law would be changed under a large replacement ratio. ... {Application of Coal Gangue as a Coarse Aggregate in Green Concrete Production: A Review}, author={Shan Gao and Sumei Zhang and Lanhui Guo}, journal={Materials}, …

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 plunger pump, with a maximum ...

5.1.1. Water Absorption It is foreseeable that the water absorption of coal gangue concrete would be in-creased by raising the coal gangue replacement ratio, as its water absorption is higher than that of natural gravel. Figure 3a shows the permeability coefficient of the concrete under 25% and 30% replacement ratios.

1. Introduction. Coal gangue, a waste produced during coal mining, has been regarded as the largest source of industrial waste in China. It is estimated that the production of 1 t coal generates 0.1–0.25 t coal gangue [1], and the total stockpile of coal gangue exceeds 6 billion tons in China [2], [3].The coal gangue not only occupies …

Adding modified materials to coal gangue concrete is a viable future development direction. ..., global coal production. slightly decreased in 2022 compared to 2021, reaching 7.742 billion tons; ...

The production process of cement using coal gangue as raw material is similar to that of clay. The coal gangue is first activated and then ground in proportion to the quicklime and seed crystals. After the grinding, the mixture is hydrothermally …

The results showed that the flexural and compressive strengths of concrete prepared with cement replaced by 15 wt% thermally activated coal gangue powder at 800 °C were 0.39% and 5.94% lower than ...

1.2. Source and distribution of CG in China. CG is a kind of black gray shale rock produced in the process of coal production. China is the world's largest coal producer (Munir et al., 2020) and also the largest coal consumer.Coal provides about 62% of China's energy demand (Mita et al., 2015).In the process of sorting and processing, the production of …

The blocky coal gangue was broken by a jaw crusher into small particles with a size range of 1 mm–10 mm. The particles were dried at 100 °C for 24 h and then calcined at different temperatures (400 °C, 500 °C, 600 °C, 700 °C, 800 °C, 900 °C, 1000 °C and 1200 °C) with different holding times (0.5 h, 1 h, 1.5 h, 2 h and 3 h) and cooling …

During the production of sintered brick, coal gangue was firstly crushed, homogenized, milled and pressed into compacts, then the dried compacts were sintered at appropriate temperatures for few hours to obtain the final brick (Xu et al., 2017). Moreover, coal gangue and bauxite were mixed at a ratio of 4:1 to pave roadways (Cai and Liu, …

Coal gangue (CG) waste is the harmful by-product separated from coal mining industry, which accounts for about 15% of total output of raw coal. For the last several decades, coal has become the primary energy source in China and the accumulative amount of discharged CG has reached 5 billion tons with an increment of …

In this paper, coal gangue powder (CGP) was used to replace 30% of the cement weight. The dosage of steel slag powder (SSP) was 5%, 10%, 15%, 20%, and 25% of the coal gangue weight. The CGP-SSP-cement mortars and pastes were prepared. The compressive and flexural strengths, hydration heat, X-ray diffraction (XRD), …

Metakaolin can be prepared by calcining coal gangue with kaolinite as the main component and is used as an auxiliary cementitious material in cement production to replace a portion of cement ...

In order to investigate the strengthening influence of silica fume on the sulfate corrosion resistance of reclaimed coal gangue sand concrete (RCGSC), the compressive strength, failure morphology, micromorphology, phase composition, compressive strength efficiency and corrosion resistance coefficient were analyzed, …

Coal 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 …

A very important part of cement production is its use in industry, which changes the structure of cement. Tian et al. (2022) ... Coal gangue concrete (CGC), a great low cost and environment ...

Coal gangue (CG), an industrial solid waste with high contents of Li and Ga, has attracted the attention of researchers. However, the utilization of CG remains an economic challenge. Pre-enrichment of Li and Ga by flotation was carried out with a view to improving the comprehensive utilization of CG. Mineral composition, time-of-flight …

Abstract. Among the techniques for converting stacked coal gangue to reusable material, one of the most effective ways is to use coal gangue as a coarse aggregate in green concrete productions. The physical and chemical properties of rock and spontaneous-combustion coal gangue are generally suitable for being used as a coarse …

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. ... A concrete material with waste coal gangue and fly ash used for farmland drainage in high groundwater level areas[J]. Journal of Cleaner Production, 2016, 112: …

Processes | Free Full-Text | Activation of Low-Quality Coal Gangue Using Suspension Calcination for the Preparation of High-Performance Low-Carbon …

Cement coal gangue backfill (CCGB) materials are made of cement, coal gangue, fly ash, and water by mixing [4], through the pipeline to goaf. With its great mechanical performance and long-time stability, cement coal gangue backfill materials could effectively support the overlying strata above goaf [5], [6]. Although CCGB has …

Coal gangue partially replaces cement, can reduce cement energy consumption, production costs and environmental hazards, while improving the raw …

The coal gangue contains high amounts of SiO 2 and Al 2 O 3, making it a promising candidate for utilization as a mineral additive in concrete. Coal gangue partially replaces cement, can reduce cement energy consumption, production costs and environmental hazards, while improving the raw material grinding ease, increase raw …

Xu H, Song W, Cao W, et al. Utilization of coal gangue for the production of brick[J]. Journal of material cycles and waste management, 2017, 19(3):1270-1278. doi: 10.1007/s10163-016-0521-0. ... Process flowchart of the production of cement with coal gangue. Figure 2. Process flowchart of the preparation of alumina with coal gangue.

Download Citation | On Feb 1, 2024, Tong Zhang and others published Utilization of coal gangue sand in structural concrete as fine aggregate towards sustainable production | Find, read and cite ...