Evaluation and comparison for higher temperature

Coal gangue powder accounting for 0% 25% 50% 75% and 100% by weight of ore powder is used to replace ore powder to improve the freeze thaw resistance of to the test data

Characterization studies on coal gangue for sustainable

Global rise in greenhouse gas emissions GHG is triggered mainly due to the consumption of fossil fuels for power generation and domestic usage Among the fossil fuels coal is a primary contributor to global GHG with substantial emissions generated during its mining and combustion process Coal gangue a residue produced during the coal mining process has

Progress in the utilization of coal gangue for soilification and

Discussion on Using High Sulfur Coal Gangue to Improve Soil [J] Coal Processing and Comprehensive Utilization 1999 3 16 18 [8] Zhang Hongmin Li Shuwei Hu Bin Destruction of Mining Ecological Environment by Coal Gangue and Its Resource Utilization [J] Mining Technology 2008 5 62 64

High capacity utilization of coal gangue as supplementary

Coal gangue CG which accounts for about 10 20 % of coal output is a kind of solid waste generated during the coal mining and washing processes According to Fig 2 the annual output of CG in China fluctuates between 600 800 million tons with a utilization rate hovering around 70 %

Multi scale coal and gangue detection in dense state based

Automated sorting equipment for coal gangue is progressively replacing large mechanized separation equipment a vibrating screen [5] air dense medium fluidized bed [6] and heavy medium wet separation method [7] for its high integration and identification and positioning have been confirmed as a vital technology in the automated

Underground Disposal of Coal Gangue Backfill in China MDPI

China s total coal production in 2021 exceeded 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 existing gangue backfilling

Investigation of Engineering Properties and Solidification

As sodium silicate and coal gangue powder are added to the JC2 to JC5 group specimens and mixing is increased coal gangue powder not only performs a microaggregate filling and physical filling role but also in an alkaline environment AL─O and Si─O bonds in coal gangue powder will be dissolved and silicon and aluminum ion monomer will be

Synergistic performance of microwave activated coal gangue

In China coal gangue a by product of coal mining offers a promising alternative as it can be activated and used in LC 3 production [30 31] Coal gangue which is abundant and often considered a waste material poses significant environmental challenges due to its disposal issues

Influence of thermally activated coal gangue powder on the

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 The effect and mechanism of the cementitious

Properties and Hydration Mechanism of Cementitious

At present the preparation of activated coal gangue mainly adopts the method of calcining lumpy materials in a stacked state and the calcination time is generally as long as 2 6 h which not only exhibits high energy consumption but also causes the unstable quality of the product [15 19] Suspension calcination technology is a new process used for gangue

Evaluation and comparison for higher temperature

Coal gangue powder accounting for 0% 25% 50% 75% and 100% by weight of ore powder is used to replace ore powder to improve the freeze thaw resistance of to the test data

Durability of Concrete With Coal Gasification Slag and Coal

Thus the use of coal gangue CG and coal gasification slag CGS as SCMs in concrete attracted more researcher s attention This paper investigated the mechanical strength porosity and durability of CG and CGS added concrete

Durability of Concrete With Coal Gasification Slag and

processing technology Both CG added and CGS added concrete illustrated better Gasification Slag and Coal Gangue Powder Front Mater 8 791178 doi /

Research Progress in Activity Evaluation Method of Calcined Coal Gangue

Coal gangue is a solid waste discharged in coal mining and dressing process Large scale decarbonization and activation treatment are key steps toward massive and efficient utilization of coal gangue

Preparation and properties of phosphogypsum based calcined coal gangue

Wang et al [28] used calcined coal gangue CCG powder to fully replace fly ash to prepare alkali active slag materials The results showed that the compressive strength of the test blocks increased by 4 27 % after 7 days even though the microstructure did not significantly change The equipment used in the test is the TPMBE 300 flat

Manufacturing ultra high performance geopolymer concrete

Additionally coal gangue powder < mm was used to prepare active powder The raw coal gangue particles were placed in a box resistance furnace and calcined at different temperatures 600 °C 750 °C 900 °C for 4 h After natural cooling the CCGA were obtained and labeled as CG 600 CG 750 and CG 900 The coal gangue powder was

Coal and gangue classification in actual environment of

Coal preparation technology [1] is an essential process in coal production and a considerable measure to improve quality of coal Gangue is a solid waste released during the processes of coal mining and coal washing and sorting coal and gangue is essential for preventing environmental pollution and improving production quality [2] Under the

Cascade network for detection of coal and gangue in the

DOI / Corpus ID 225031397; Cascade network for detection of coal and gangue in the production context article{Lv2021CascadeNF title={Cascade network for detection of coal and gangue in the production context} author={Ziqi Lv and Weidong Wang and Zhiqiang Xu and Kanghui Zhang and Haimei Lv} journal={Powder Technology} year={2021}

Durability of Concrete With Coal Gasification Slag and Coal

Thus the use of coal gangue CG and coal gasification slag CGS as SCMs in concrete attracted more researcher s attention This paper investigated the mechanical strength porosity and durability of CG and CGS added concrete

Progress in the utilization of coal gangue for soilification

Moreover coal gangue contains nutrients essential for plant growth [9] By processing it appropriately coal gangue can be transformed into soil amendments for soil remediation and improvement paving the way for a synergistic approach to coal gangue utilization and mining area ecological restoration

Cascade network for detection of coal and gangue in the

Online detection of coal and gangue is the key to intelligent separation of coal and gangue which is significant for improving coal mining efficiency and deducing environmental improve the detection of coal and gangue under complex conditions we proposed a cascade network that consists of detector and the idea of combining

Spontaneous combustion coal gangue based composite

Coal gangue is a byproduct of coal mining constituting approximately 15 % of the total raw coal output [1] Over the past few decades coal has become the primary energy source in China resulting in the accumulation of 5 billion tons of coal gangue with an additional 300 to 350 million tons generated annually [1] Spontaneous combustion coal gangue is a

Utilization of coal gangue sand in structural concrete as fine

Coal gangue is the main tailings of coal mine accounting for about 10% ∼ 20% of coal production At present China is the largest coal production country reaching 5 billion tons rising at an annual rate of 150 million ∼ 200 million tons [1] [2] In recent years the average annual consumption of concrete in China has exceeded 436 million tons and the average

Preparation of High Ductility Cement Calcined

The laser was aimed at the coal gangue powder inside the crucible and slowly moved to determine the high temperature point The coal gangue powder with the highest temperatures of 400°C 500°C 500°C 600°C 600°C 700°C and 700°C 800°C was selected The test equipment is shown in Figure 5

Simultaneous nutrients activation and pollutants removal of coal gangue

Coal gangue CG is a solid waste generated during coal mining washing and processing accounting for 15 20% of coal production It is considered one of the largest industrial solid wastes in terms of discharge and accumulation amounts Wu et al 2017 As the world s largest coal producer China had accumulated over 7 billion tons of coal gangue by 2022