coal gangue bricks technology

Preparation of porous cordierite ceramic with acid-leached coal gangue

Coal gangue is a complex industrial solid waste discharged during excavation and washing of coal in the course of production. The amount of coal gangue accumulated in China has exceeded 5 billion tons [1,2,3]; moreover, the stockpile of gangue is still increasing at the rate of approximately 0.3 billion tons per year [4, 5].The disposal …

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 …

The environmental characteristics of usage of coal gangue …

Many products have been prepared from coal gangue, but the common utilization methods of coal gangue are as power plant fuel [8] and to prepare building materials [9], including brick [10], cement ...

Solidification/stabilization of municipal solid waste

In this paper, an uncalcined coal gangue–based alkali-activated cementitious material was used to solidify the MSWI FA. The compressive strength of these cementitious materials was evaluated through different contents of alkali activators, SiO2/Na2O molar ratios, liquid/solid ratios and curing temperatures by utilizing a single …

Preparation and mechanism of the sintered bricks produced …

DOI: 10.1016/j.jhazmat.2011.11.095 Corpus ID: 10142603; Preparation and mechanism of the sintered bricks produced from Yellow River silt and red mud. @article{He2012PreparationAM, title={Preparation and mechanism of the sintered bricks produced from Yellow River silt and red mud.}, author={Hong Tao He and Qinyan Yue …

Analysis and improvement measures of defective …

Analysis and improvement measures of defective coal gangue fired brick. Shanshan Shen1, Xinghua Li1, Chenghui Li1 and Xiaoqing She1. Published under licence …

Research and engineering practice on space …

The issue of gangue emissions accompanying coal production is one of the key factors currently hindering the green and efficient development of the coal industry …

Fire bricks with Coal Gangue and Fly Ashin in china

The products were mainly solid bricks, but also porous bricks, Concrete masonry unit and hollow blocks. The earliest successful trial production of coal gangue bricks was carried out by Sichuan Yongrong Mining Bureau, and the Shigu Coal Mine in Gaoming City also built an annual production line of 15 million coal gangue bricks in the …

Migration transformation, prevention, and control of …

Coal gangue is one of China's main industrial solid wastes, which contains various harmful heavy metal elements, such as lead (Pb). The long-term accumulation of …

Sodium-based alkali-activated s from self-ignition coal gangue …

Coal gangue (CG) is an industrial residue/solid waste/by-product, mainly generated in the course of coal excavation, mining, and coal washing [1]. ... illite, and quartz [1], which have the potential to be used as raw materials for ceramics [4], brick [5], cement [6], zeolite [7], geopolymer [8], and other materials [9]. A self-oxidation ...

(PDF) Power Generation from Coal Gangue in China

Conventional gangue treatment methods mainly include gangue power generation, gangue bricks, ... C. S. Zhang: Coal gangue; utilisation and new technologies (Chemical Industry Publications, Beijing ...

Ecological Mortar from Recycled Composite Powder with Waste Clay Brick

The clay brick and powder recycled from construction and industrial waste may be utilized as recycled construction materials. To alleviate the negative environmental impact of the cement industry's CO 2 emission, waste clay brick was used as fine aggregate, clay brick powder (CBP), and coal gangue powder (CGP) were utilized as …

Mechanical Performances and Frost Resistance of Alkali-Activated Coal

The coal gangue after composite activation treatment is considered a potential low-carbon and green cementitious material, so the feasibility of employing composite-activated gangue to partially or entirely replace cement for building materials is systematically studied in this paper. The effects of alkali content, slag content, and water …

Analysis and improvement measures of defective coal gangue fired brick

Production technology of coal gangue fired brick [J]. New building materials, 2007,34 (7): 32-33. Experimental study on Preparation of non burning pavement brick with coal gangue.

The environmental characteristics of usage of coal gangue …

The main chemical compositions (Table 1) of coal gangue are SiO 2 (54–60%), Al 2 O 3 (23–27%), Fe 2 O 3 (6–9%) and CaO (7–11%), which are deemed a suitable raw material for brick making (Raut et al., 2011).The high SiO 2 and Al 2 O 3 contents in the coal gangue suggested high compositions of clay minerals and quartz. …

The environmental characteristics of usage of coal …

The processes for coal gangue brick-making are consisted of crushing, screening, stirring, ageing, molding, pressing, drying in oven, firing and testing ( …

Fabrication and application of porous materials …

The International Journal of Applied Ceramic Technology publishes cutting-edge applied research and development work focused on commercialization of engineered ceramics, products and processes. …

Extraction of alumina from alumina rich coal gangue by a …

There are still huge amounts of coal gangue being dumped in coal reject hills and posing severe environmental and social problems [6–8]. For the present, large-scale utilization technologies of coal gangue are mainly characterized by low added-value such as making cement and bricks, power generation and paving roads [9,10].

[PDF] Nepheline‐based water‐permeable bricks from coal gangue …

Nepheline‐based water‐permeable bricks are prepared with coal gangue and aluminum hydroxide by raw material pretreating, mixing, isostatic molding, roasting, and self‐curing. These bricks exhibit balance between their mechanical and water‐permeable properties. In this study, two main factors, the raw material ratio and the molding …

A New Thin Seam Backfill Mining Technology and Its …

Backfill mining is an effective way to control ground subsidence and govern gangue. To solve the problem of thin coal seam mining under villages, a new thin seam backfill mining technology was ...

(PDF) Experimental Study on the Preparation of Improved

The experimental results showed that the best proportion of soil matrix improvement was 42.9% coal gangue, 7.1% fly ash, 10% straw and 40% soil, where the coal gangue particle size proportion was ...

Materials | Free Full-Text | Newly Generated Ca-Feldspar …

Coal gangue is a solid waste with low carbon content discharged during the course of the coal mining process. The resource utilization of coal gangue could solve environmental problems caused by its excessive production, such as soil contamination and land occupation. This study proposed to produce high-strength thermal insulation bricks …

(PDF) The Environmental Geochemistry of Trace …

Simultaneous sampling of coal gangue, brick, fly ash and flue gas were implemented. ... This paper shows that the industrial implementation of these technologies can increase the current …

Detection of Spontaneous Combustion Areas of Coal …

Spontaneous combustion of coal gangue dumps not only releases toxic and harmful gases, polluting the environment, but also leads to explosion accidents and …

A concrete material with waste coal gangue and fly ash …

The density of hardened concrete increased from 2171 kg m −3 for concrete of mix V (using coal gangue to replace 30% of the gravel and using fly ash to replace 15% of the cement) to 2488 kg m −3 for concrete of mix I (no use of fly ash and coal gangue), as shown in Fig. 5. Because of the low density of the coal gangue, the density of the ...

CN103896559A

The invention relates to a technology of a building wall material, namely a sintered porous brick, in the field of the building materials. The technology is characterized in that coal gangue and desert sand are used for producing a novel coal gangue-desert sand sintered porous brick in stead of partial clay raw material of the traditional clay bricks, wherein …

Microstructure of Coal Gangue and Precipitation of Heavy

The microstructure and mineral composition of the gangue play a decisive role in the precipitation of heavy metal elements. In this study, the microstructure, mineral composition, and precipitation of heavy metal elements of coal gangue with different weathering degrees were analyzed through electron microscopy, X-ray diffraction, and …

ReviewComprehensive utilization and environmental …

Currently, the coal gangue filling technology adopts a simple and single utilization mode, the development of technology combining mining with filling can not …

Activation Mechanism of Coal Gangue and Its Impact on …

Figure 2. Waste coal gangue (a) Coal gangue pollution; (b) Coal gangue mountain. Polymers 2022, 14, x FOR PEER REVIEW 2 of 25 Figure 1. Coal consumption yearº onº year growth rate, 2010º 2020 (PJ) (data from International Energy Agency Statistics, 2020). Coal gangue (CG) is a hard rock produced during coal formation, …

Utilization of coal gangue for the production of brick

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 …