Improved holding and releasing capacities of coal gangue toward

In order to enhance the phosphate absorption capacity of coal gangue through alkali activation three alkali activated silicate coal gangue according to fine size AS FCG 1 The best adsorption performance of AS FCG were associated with generation of calcium silicate hydrate gel and ettringite which provided more Ca 2 Al 3 hydroxyl

Influence of coal gangue mulching with various thicknesses and Nature

CK is control treatment without mulched coal gangue P1 P2 P3 and P4 represent the treatments of four different particle sizes of coal gangue cm 1 cm 1 2 cm and 2 4 cm

Typical Density Of Concrete Hollow Blocks In The 2024 6 7Density of Concrete Masonry Block As said above 3 blocks shall be taken to conduct this test To determine the density of block first heat the block in the oven to 100 o c and then cooled it to room temperature

Processes Free Full Text Revealing Impact Characteristics of the

when the injection pressure exceeds a certain value 1 the injection pressure blows dust directly into the sphere 2 small dust particles collide combining into larger dust particles which only burn or settle directly with some difficulty 3 after the air flow formed by the blowing pressure reaches the top it is blown back and the dust …

Preparation Properties and Application of Gel Materials for Coal

In order to solve the problem of the spontaneous combustion of coal gangue a coal gangue fire extinguishing material of gel foam was developed The foaming agent was screened by the Waring blender method with varying foam amounts and the superabsorbent foam stabilizer was synthesized by free radical polymerization

Micromachines Free Full Text YOLOv4 Tiny Based Coal Gangue Image

Nowadays most of the deep learning coal gangue identification methods need to be performed on high performance CPU or GPU hardware devices which are inconvenient to use in complex underground coal mine environments due to their high power consumption huge size and significant heat generation Aiming to resolve these problems this paper proposes a coal gangue identification method based on

Trace Elements in Coal Gangue A Review IntechOpen

Coal gangue is one of the largest industrial residues It has high ash content low carbonaceous content and heating value Meanwhile it has some trace elements Large quantities of coal gangue cause serious environmental problems by polluting the air water and soil as well as occupying a tremendous amount of land Now coal gangue utilization is a matter of great concern and has attracted

Release characteristics of heavy metals in high sulfur coal gangue

Coal gangue HS CG is the dark gray rock produced during coal mining and washing process and its production is about 10% 15% of coal mining which depends on the geology and mining conditions Zhu et al 2024 Bai et al 2024 Due to the utilization of coal resources in the world lead to the accumulation of HS CG also increased year by

Effect and mechanism of coal gangue concrete modification by basalt

Industrial solid waste coal gangue is used to replace natural gravel to prepare coal gangue concrete CGC It can not only reduce the overuse of natural aggregate but also solve the environmental problems caused by the large amount of coal gangue stockpiling which is an important direction of concrete development in the future

Using Chinese Coal Gangue as an Ecological Aggregate and Its

Affiliations 1 School of Civil Engineering and Communication North China University of Water Resources and Electric Power Zhengzhou 450045 China 2 State Key Laboratory of Eco Hydraulics in Northwest Arid Region Xi an University of Technology Xi an 710048 China PMID 35806620 PMCID PMC9267344 DOI /ma15134495

Improvement on pozzolanic reactivity of coal gangue by integrated

Eco cement containing 56% of activated coal gangue had been successfully produced for road pavement application with a 28 days concrete compressive strength of Compared with the traditional clinker producing process energy consumption for producing activated coal gangue could save /ton equivalently which is due to its low

from feedstocks and other Traduction en français exemples anglais

Traductions en contexte de from feedstocks and other en anglais français avec Reverso Context When setting their national targets Member States shall provide available information on the quantities of biofuels consumed from feedstocks and other fuels listed in part A of Annex IX

The results showed the following 1 Optimized formulation could be achieved at coal gangue powder slag fly ash ratio of 5 4 1 M sodium silicate modulus % sodium silicate and 5% Na 2 O The LCGGM possesses clean production high fluidity fast setting low bleeding rate high compressive strength and seepage pressure providing

The variations of free radical and index gas CO in spontaneous

In order to solve the problem of the spontaneous combustion of coal gangue a coal gangue fire extinguishing material of gel foam was developed The foaming agent was screened by the Waring blender method with varying foam amounts and the superabsorbent foam stabilizer was synthesized by free radical polymerization

Preparation and Reaction Mechanism Characterization of Alkali PubMed

Ca 2 in the slag promotes exchange with Na and the product is converted from N A S H gel to C A S H gel and C A S H is formed with higher Ca/Si ratio with the increase of slag content The slight replacement of coal gangue by slag can greatly improve the reaction process and the strength of AACGS materials

[PDF] Hydrothermal Synthesis of SBA 15 Using Sodium Silicate Derived

Well ordered SBA 15 was prepared with a hydrothermal route by sodium silicate derived from coal gangue The as prepared sample was analyzed by SAXRD BET TEM and SEM respectively The results indicate that at a low hydrothermal temperature of 100 ∘ C the well ordered mesoporous SBA 15 could be synthesized The surface area pore volume and pore size of the sample are 552 m 2 /g cm

Potential CO2 Leakage Reduction through Biofilm Induced Calcium

Mitigation strategies for sealing high permeability regions in cap rocks such as fractures or improperly abandoned wells are important considerations in the long term security of geologically stored carbon dioxide CO2 Sealing technologies using low viscosity fluids are advantageous in this context since they potentially reduce the necessary injection pressures and increase the radius of

Enhancement of coal gangue performance by surface micro crystalline

Results showed that after calcining with mineral powders the crushing rate of coal gangue decreased from % to % and water absorption decreased from % to % among which the coal gangue treated by K feldspar and blast furnace slag had the lowest water absorption % reducing by % compared to raw coal gangue

Road performance analysis of cement stabilized coal gangue mixture

Using coal gangue as production materials of gelled substance not only reduces production cost but also helps to consume coal gangue waste Organic matters extracted from coal gangue waste can be used for the production of agrochemical raw materials and unusable coal gangue waste can be used for backfilling soil after treatment [ 11 ]

Preparation and characterization of coal gangue geopolymers

Coal gangue which refers to the solid waste discharged during coal mining and coal washing processes is one of the largest industrial solid wastes in China It accounts for 10% 25% of the total amount of coal mining [10] [11] [12] So far China has accumulated more than 7 billion tons of coal gangue

The experimental study of the coal gangue as gel filling materials

The experimental study of the coal gangue as gel filling materials Authors Dong mei Tian Jian Yao Zhong an Jiang Xin min Wang Abstract The odd axes resist pressure intensity with

Rapid synthesis and NH 3 SCR activity of SSZ 13 zeolite via coal

The silica alumina atomic ratio of the coal gangue was approximately Compared with the silica alumina ratio of the gel 15 coal gangue was mainly used as the aluminum source The Al NMR results of the coal gangue are shown in Fig 6c It indicated that Al in the coal gangue consisted of octahedral aluminum and tetrahedral aluminum

Gangue crusher coal gangue crusher Zhengzhou Vanguard Machinery

86 371 55578880 Introduction Coal gangue is a kind of solid waste discharged during coal mining and coal washing It is a kind of black grey rock with lower carbon content and harder than coal which is associated with coal seam in the process of coal formation

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PDF Application of Coal Gangue as a Coarse Aggregate in Green

Using coal gangue as coarse aggregate partly or completely replacing natural aggregate to produce coal gangue concrete CGC will effectively reduce the mining amount of natural gravel [13] [14

Electromagnetic wave forward modeling of coal gangue mixed model in top

The automatic control of top coal caving is of great significance to realize intelligent coal mining In the process of top coal caving a coal gangue mixed area containing coal gangue and air is formed at the tail beam of the hydraulic support which has different electromagnetic parameters different volumes and different shapes

Early age characteristics of red mud coal gangue ScienceDirect

The red mud and coal gangue were mixed together at a ratio of 3 2 Then with a water to solid ratio of the red mud coal gangue mixtures were shaped in small spheres with a diameter of 3 cm and dried at 110 °C After that they were calcined in a programmable electrical furnace at 600 °C for 2 h

Synthesis of zeolite SSZ 13 from coal gangue via ultrasonic

The XRD patterns of raw coal gangue after grinding and drying was illustrated in Fig 1 It indicated that the main mineral phases in coal gangue were quartz kaolinite and pyrite In previous works the amorphous aluminosilicate gel was found to be considered as a zeolite precursor [34]

Experimental study on the physico mechanical properties and

Part of Ca OH 2 crystals were covered by C S H gel and AFt and it was verified that Ca OH 2 took part in the secondary pozzolanic reaction and formed To study coal gangue foam concrete s mechanical properties and microstructure various materials such as CG FA cement and foam and their blending amounts have been experimented with

Minerals Free Full Text Study on Macro Meso Deformation Law and

Bulk gangue is a common backfill material in solid backfill mining After backfilling into the goaf bulk gangue serves as the main body to bear the load of overlying strata and its deformation resistance is the key factor affecting the backfill quality In this study the laterally confined compression test of broken gangue was designed the compaction deformation characteristics of gangue