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Green preparation of hierarchical porous C/SiOx composites ...

According to the solid-to-liquid ratio of 1:2 (g:mL), coal gangue powder was soaked in 3 mol/L HNO 3 solution at room temperature for 48 h to eliminate metal impurities. After finishing the soaking processes, the waste acid liquor was separated from coal gangue powder via filtration, and then it was used to prepare metal hydroxides.

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Experimental Studies on the Impact of Waste Mineral ...

As the common waste of the production in daily life,a large number of stone powder, fly ash, coal gangue was abandoned, and it causes large tracts of land was occupyed and the environment was polluted. Therefore it is great singnificance to saving resources and protecting environment by studing the impact of the three kinds of wastes as mineral …

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High Strength Glass-Ceramics Fabricated With Coal Gangue ...

coal ash, incinerator ash, and waste glass, and shell, oil shale ash and phosphorous fertilizer. Coal gangue as a type of industrial solid waste is widely used to produce cement [3], ceramics [4,5], refractory brick [6], zeolite [7], lightweight aggregate [8], and so on. A very large amount of the coal gangue is produced in coal production.

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Preparation of a Gangue-Based X-type Zeolite Molecular ...

1. Introduction. Coal gangue is a byproduct of coal mining and processing, which is unavoidable due to limitations of the existing technical conditions, and emissions are on the rise. 1 The accumulation and storage of coal gangue occupy a large amount of land area. Gangue is prone to spontaneous combustion, and the pollutants contained within will pollute …

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Dispersibility of Kaolinite-Rich Coal Gangue in Rubber ...

Superfine coal gangue powder (GR or GA) was prepared by spray drying the diluted slurry. On the other hand, the modifier with a mass of 1% of coal gangue was slowly dropped into diluted slurry. Then, the slurry was stirred for 1h and spray-dried to obtain modified sample (MGR or MGA).

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Study of the internal re-breaking characteristics of ...

1. Introduction. The overburden strata of a mining seam are conventionally subdivided into four zones from the bottom the top: the caved zone, fractured zone, continuous bending zone and surface zone [,, ].The caved zone is formed by the broken rock-coal particles in the gob [1,4,5].Unlike pore and fractured media in the fracture zone and the continuous bending zone, …

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Preparation of CaO–Al2O3–SiO2 glass ceramics from coal gangue

Coal gangue powder can be used to generate electricity, used to produce cement materials and ... [12,13], among others. However, although there is a …

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Article Frost Resistance of Coal Gangue Aggregate Concrete ...

China has exceeded 3 billion tons in recent years, and the annual increase of coal gangue is more than 400 million tons, resulting in at least 2000 coal gangue piles nationwide [3]. The accumulated coal gangue has been occupying a large amount of cultivated land and its leaching has been causing severe contamination of soil and groundwater [4,5].

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Preparation and characterization of coal gangue modified ...

Coal gangue is one of the largest industrial wastes in China, a large number of coal gangue accumulation not only occupies too much land area, but also causes surrounding land and air pollution. In this paper, the coal gangue samples were activated at first, and then the coal gangue powder was modified by adding coal gangue powder to road asphalt with the ratio …

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CN102674381A - Method for preparing nano mullite powder ...

coal gangue powder raw nano mullite Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Pending Application number CN2012101590844A Other languages Chinese (zh) Inventor ...

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Coal gangue – Electro Magnetic Industries

A large number of stacked coal gangue, not only pressure occupied land, ecological impacts, waste rock leaching water surrounding soil and groundwater pollution, and coal gangue contains some combustible material, spontaneous combustion occurs under suitable conditions, emissions of sulfur dioxide, nitrogen oxides, carbon oxides and soot and ...

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Mechanism on Activation of Coal Gangue Admixture

The coal gangue powder of more than 300 mesh was placed into a hemispherical crucible with a loading amount of 1 kg each time. Then, the surface of the powder in the crucible was flattened and placed into a microwave oven (ORW10S-3T, 2450 MHz, 380 V). The coal gangue powder was set to 1.33 kw and irradiated for 25–30 min.

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Preparation, characteristics and mechanisms of the ...

Abstract Iron ore tailings and coal gangue powder are the main sources of industrial solid wastes, the dispose of which has become severe and urgent with the increasing demand of environmental harmony. The present study firstly proposed a reasonable way to deal with the large amount of iron ore tailings and coal gangue powder by making them as the …

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Particle size distribution of coal and gangue after impact ...

Underground pneumatic separation of coal and gangue with large size (=50 mm) in green mining based on the machine vision system [J]. Powder Technology, 2015, 278: 223–233. Article Google Scholar

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Transparent characterization of spatial-temporal evolution ...

High-intensity mining of underground coal resources has led to a series of ecological environmental problems (as shown in Fig. 1), such as the discharge of gangue solid waste (GSW), surface collapse, soil erosion, vegetation damage.In particular, the large amount of GSW on the ground not only occupies the massive land, pollutes the atmospheric environment …

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Stellar gangue crusher For Construction - Alibaba.com

Concrete Block Crusher Coal Gangue Heavy Hammer Crusher, Coal Gangue Hammer Crusher, Concrete Block Crusher. $21,850.00-$21,900.00/ Set. 1 Set (Min. Order) 14 YRS CN. Supplier. Contact Supplier. Compare. As the main rock crusher in stone crusher plant, the hammer crusher is ideally suitable for crushing all kinds of ores and any big-sized ...

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A Laboratory and Numerical Simulation Study on Compression ...

Gangue particles (GP) are an important part of solid filling materials in coal mines. The compression characteristics (CC) of gangue determine whether it can effectively control roof subsidence. The particle size distribution (PSD) of GP is the main factor affecting the CC; therefore, it is important to find the optimal size distribution of GP and to investigate the …

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Study on Preparation of Coal Gangue-Based Geopolymer ...

Coal gangue is the largest solid waste discharged and occupied in China. Most coal gangue contains clay minerals and has a similar chemical composition to clay, which can be used as raw materials for the preparation of geopolymer and geopolymer concrete [ 12, 13 ]. The alkaline solution is usually used as an activator for making geopolymer.

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Mechanical Properties of Furnace Slag and Coal Gangue ...

Coal gangue is a rock type with lower carbon content and higher hardness compared with coal. Coal gangue comprises multiple rocks and forms one of the primary wastes in coal production. Although >300 million tons of coal gangue are discarded each year, China's utilization rate of coal gangue has reduced [1,2,3,4].

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Highly effective removal of Pb2+ in aqueous solution by Na ...

The raw coal gangue samples were crushed into different particle sizes. Then, they were milled and passed through a 150-mesh sieve to gain the coal gangue powder (CGP) for the next step. Subsequently, the 2 g CGP was mixed and ground with a certain mass of NaOH(s) in a mortar for 5 min to obtain a homogeneous mixture.

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Materials | Free Full-Text | Low-Carbon and Fundamental ...

The feasibility of using coal gangue powder as supplementary cementitious materials (SCMs) has been confirmed [41,42]. The authors found that the compounds found in spontaneous combustion gangue powder (SCGP) and RCP lead to acceptable mechanical properties of mortar. Although there are some research results on the use of CDW and coal …

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Air Classifier Mill of coal Gangue-ALPA POWDER

With the development of society, the application of Air Classifier Mill of coal Gangue has become more large.. Air Classifier Mill of coal Gangue equipment requires the integration of equipment and process research and development. Since the ultrafine powder grinding equipment must be adapted to specific material characteristics and product indicators, …

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Study on Mechanical Properties of PET Fiber-Reinforced ...

If a large amount of coal gangue cannot be used reasonably and efficiently, not only will a large amount of mountains and farmland be occupied, ... "Effect of two kinds of activated coal gangue powder on compressive strength and pore size of blended cement mortars," Disaster Advances, vol. 3, pp. 397–399, 2010.

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Combing phosphorus-modified hydrochar and zeolite prepared ...

Besides, the coal gangue powder used in this study has a high content of silicon and alumina (60.52% SiO 2 and 33.02% Al 2 O 3). The SiO 2 /Al 2 O 3 molar ratio of the coal gangue (n (SiO 2)/n (Al 2 O 3) = 3.1) was near to the optimal SiO 2 /Al 2 O 3 molar ratio (n (SiO 2 /Al 2 O 3) = 2.9) of the reaction mixture (Yang et al., 2019). That is ...

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Preparation of Mullite Nanocomposites Powders by the ...

It is indicated that mullite nanocomposites powders can be prepared at 80-90 °C for 3 h with NaOH concentration of 2-4 mol/L and L/S ratio (liquid/solid ratio in mass) of 10 mL/g by using calcined coal gangue as precursor. The agglomerate powder size of D50 is about 3.83-4.71 mm.

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CN105906321A - Coal gangue lightweight through-hole ...

The invention discloses coal gangue lightweight through-hole ceramsite. The technical scheme has the essentials that the coal gangue lightweight through-hole ceramsite is composed of coal gangues, attapulgite clay, a powdery coal gangue ing agent, active carclazyte waste dreg, hollow microspheres, lightweight magnesium oxide, expanded perlite, expanded vermiculite, …

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crusher or gangue powder machine

How To Effectively Use Coal Gangue? · Coal Gangue Pulverizer Raymond Mill Finished product fineness: 80-325 mesh Production capacity: 1.5-100t/h It is suitable for the processing of more than 300 kinds of high-fine powder materials in non-flammable and explosive mineral, chemical, construction and other industries with Mohs hardness ...

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The experimental study of the coal gangue as gel filling ...

The odd axes resist pressure intensity with large quantity coal gangue was discussed and experimented on fly ash and coal gangue gel filling body between different concentration, proportion and additive dosage. The results show that forepart intensity of new gangue filling body is very low, and anaphase intensity have some increase which still go up …

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KR20130009000A - Coal gangue ceramsite and its preparation ...

The present invention is an artificial lightweight aggregate using coal waste-rock and its manufacturing method, the raw material is 75-85% (weight ratio) of coal waste-rock powder, 5-10% adhesive, 1-5% additives and 5-10 fly ash Composition as an expanding solidifying agent; In addition, the method of manufacturing artificial lightweight aggregate includes the following …

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On-Site Measurement on Compaction Characteristics of Coal ...

Gangue is the main backfilling material in solid backfilling mining, and its compaction characteristics determine the overburden control effect and surface subsidence. Under the action of compaction force and overburden pressure, the gangue will be broken, rotated and occluded, resulting in different compaction characteristics of gangue in the field and laboratory.

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Prediction of Horizontal Pneumatic Conveying of Large …

The pneumatic conveying focusing on gas-solid two-phase flow plays an important role in a conveying system. Previous work has been conducted in the fields of small particles, where the size was less than 5 mm; however, there are few studies regarding large sizes (>5 mm). In order to predict the horizontal pneumatic conveying of large coal particles, the coupling methods …

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Preparation, characteristics and mechanisms of the ...

Coal gangue powder present as the charcoal grey particles were acquired from Yuanbaoshan coal mine in Chifeng, China. 39.90% particle size of coal gangue powder particles below 74 μm, which have slightly better plasticity (~10) and 2.02 g/cm 3 density. Sewage sludge was given by the Chengde Sewage Plant, which is the dark black muddy matter ...

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Preparation, characteristics and mechanisms of the ...

The present study firstly proposed a reasonable way to deal with the large amount of iron ore tailings and coal gangue powder by making them as …

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