Composition and color of coal gangue

Evaluation of coal gangue and ash for calcined kaolin …

2013-8-21 · Abstract: For comprehensive utilization of solid waste, coal gangue, slag of CFB and washed fly ash provided by a coal mine were evaluated on their potential as calcined kaolin. Studies on these samples include the determination of chemical composition by ICP, the analysis of mineralogical construction by XRD, orthogonal experiments of iron leaching by acids and …

Energies | Free Full-Text | Image Recognition of …

2019-5-8 · Recognizing and distinguishing coal and gangue are essential in engineering, such as in coal-fired power plants. This paper employed a convolutional neural network (CNN) to recognize coal and gangue images and …

Effects of Expansive Additives on the Shrinkage Behavior …

2021-7-14 · The suitability of applying shrinkage reducing additives in alkali activated coal gangue-slag composites is discussed in this study. The effect of sulphoaluminate cement (SAC), high performance concrete expansion agent (HCSA) and U-type expansion agent (UEA) on the reaction process, shrinkage behavior, phase composition, microstructure and mechanical …

Coal Gangue Crushing and Screening

2022-6-1 · Coal Gangue is a kind of solid waste discharged from coal mining and coal washing. It is also a kind of black-gray rock with lower carbon content and harder than coal. Its main components are Al2O3 and SIO2. In addition, it contains various amounts of Fe2O3, Cao, MgO, Na2O, K2o, P2O5, SO3 and traces rare elements (gallium, vanadium, titanium ...

Source Alkali-Leached from Coal Gangue Synthesis of …

2017-5-9 · 3.1 Calcination of Coal Gangue Table 1 presents the chemical composition of coal gangue before and after calcination at 800 C, 850 C, 900 C and 950 C for 2 hours, respectively. Note that the LOI is the organic matter burned away …

Main chemical composition and content of coal gangue

Download scientific diagram | Main chemical composition and content of coal gangue /%. from publication: Examination of Mixing Proportion in Self …

Effects of gangue compositions on reduction process of …

2018-10-17 · The influence of gangue compositions (mainly composed of SiO2, CaO, MgO and Al2O3) on the reduction kinetics of carbon-bearing iron ore pellets was estimated at 1373–1473 K in N2 atmosphere. The results showed that gangue content and each component distribution affected the pellets reduction process. The reduction rate was found to follow a linear …

Evaluation of Mechanical Properties and Microscopic …

Alkalinity treatment can be chosen to improve cohesion of coal gangue as a result of polymeric silicon aluminum salt, with high viscosity, was produced by chemical reaction during immersion. Therefore, aqueous solution treatment contributes to engineering properties and presents great potential in both supplement road building materials and ...

Composition Analysis and Component Identification of a …

In this paper, the main components of the coal gangue in Ordos City were carried out by X-ray flu-. orescence spectrometry (XRF) and X- ray diffractio n (XRD), the eleme nt …

Valorization of calcined coal gangue as coarse aggregate …

2021-8-1 · Composition of calcined coal gangue aggregates Fig. 5 shows the appearance of the raw, calcined and sorted CGAs and NA with particle size of 4.75–9.50 mm. The surface color of CGA raw changed from black to grey because the carbon and organic matter on aggregate surface were partially burned off (mass loss was 4.9%) at 450 °C ( Fig. 5 (b)).

Microstructure of Coal Gangue and Precipitation of Heavy ...

2017-11-23 · 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 static immersion leaching …

The structural and surface properties of natural and modified coal gangue

Transformation behavior of mineral composition and trace

Research on the Relationship between Grain Composition ...

2014-4-10 · Firstly, the grain composition of coal gangue was estimated through the sieving method, then the representative grading curve was drawn through the statistics method of coarse grain content, and lastly the relationship between the repose angle and grain ...

Identification and Activation of Coal Gangue and …

2020-4-14 · 2.2 Experiment. The chemical composition measured by Bruker S8 TIGER XRF analysis; the mineralogical composition measured via Bruker D8 ADVANCE XRD analysis; thermal analysis conducted with Mettler Toledo analyzer in a temperature range of 30–1000 °C at a heating rate of 10 °C/min and N 2 or O 2 atmosphere.. Mortar strength test: prismatic mortar …

Research on Potential Fertilization of Coal Gangue in the …

2010-9-7 · Abstract: Based on the systematic analysis of the coal gangue in Weibei Coalfield, such as petrologic characteristics, chemical composition, nutrient elements, deleterious elements, and the transformation, and compared with the soil element content background values of Loess Plateau and national harmful materials controlling standards, we conclude that the coal …

coal-gangue

Gangue, also called coal gangue, is the solid waste discharged in coal mining process and coal washing process, black rock harder than coal. Its carbon content is low and exists along with coal seam. Gangue could be found in roof, bottom board, inter-layer, and it could be selected in washing process. The main ingredient are Al2O3, SiO2, Fe2O3 ...

Compression of Aggregates of Acid-Leached Coal …

2018-12-27 · The compression mechanical properties of coal gangues subjected to acidic immersion were examined using a cylinder and a YAS-500 electrohydraulic servotesting system in order to investigate the effects of pH and particle size on its compaction stress-strain and stress-compaction relationships. The evolutionary trends of the leaching solution’s pH at …

(PDF) Identification of Coal and Gangue by Feed …

Abstract and Figures. While coal is the major power source around the globe, gangue is unwanted in power plants. Thus, separating gangue from coal is a crucial part in the pre-processing step of ...

Composition of Coal Gangue Sand Making Process and …

2020-4-20 · Coal gangue is solid waste discharged during coal mining and coal washing. Its main components are Al2O3 and SiO2. It is a dark gray rock with lower carbon content and harder than coal, with a hardness of 3. If it is not used, it will occupy a large area of land, where sulfide escape or leaching will pollute the atmosphere, farmland and water ...

Influence of coal gangue mulching with various …

2021-7-28 · Coal gangue, as a type of solid waste discharged during coal mining and coal washing, occupies a large amount of land resources owing to accumulated gangue, which eventually results in ecological ...

(PDF) Basic Characteristics of Coal Gangue in a Small-Scale …

2021-6-18 · composition of coal gangue is of great significance for judging the sorption and release. ability of coal gangue to U and Th. Minerals 2021, 11, 647 7 of 14.

Transformation behavior of mineral composition and trace …

2012-7-1 · The transformation behavior of mineral and trace elements during combustion of Chinese coal gangue at varies temperatures were studied. The coal gangue sample was placed at muffle roaster and heated up to 8-desired temperature points, from 500 °C to 1200 °C with 100 °C for each interval.The mineral compositions of coal gangue and its combustion ash were …

Utilization of coal gangue for the production of brick

2016-6-8 · 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 crushed, homogenized, milled and then pressed into green compacts. The dried compacts were sintered at different temperatures for 2 h. The obtained brick samples were characterized with X-ray diffraction, …

Effects of Fine Gangue on Strength, Resistivity, and …

2015-5-21 · The cemented coal gangue backfill (CGB) in coal mining is normally made of gangue (particle size of 0–15 mm), fly ash, cement, and water. In this study, the effects of the weight content (ranging from 20% to 60%) of fine gangue (0–5 mm) on the microscopic characteristics, resistivity, and compressive strength of CGB were investigated at 3 d and …

The Composition, Morphology, and Mechanical Properties …

The ternary composites of coal gangue powder encapsulated by ethylene propylene diene monomer (EPDM) filled polypropylene (PP) were prepared to reduce the cost and control the microstructure aiming at high performance cost ratio materials. The result showed that EPDM can not only enhance the interaction between coal gangue powder and the matrix but also …

Construction of intelligent visual coal and gangue ...

2020-9-20 · Due to the energy composition of China rich in coal, poor in oil and low in gas, coal will continue to be the main energy source in China for a long time. In order to improve the intelligence level of coal mine and realize the efficient and clean utilization, coal and gangue sorting is the research focus of many experts and scholars. At present, the construction of the …

Extraction of alumina from alumina rich coal gangue by a …

2020-4-29 · 1. Introduction. Coal gangue is an industrial solid waste produced by coal mining and processing [1–3].The average production of gangue accounts for 10–15% of raw coal production [4,5], making coal gangue one of the biggest solid wastes in China.At present, utilization ratio of coal gangue can reach about 60% in some countries.

Microstructure of Coal Gangue and Precipitation of Heavy …

2017-11-23 · 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 static immersion leaching …

Chemical composition of coal gangue and slag (wt %).

Download scientific diagram | Chemical composition of coal gangue and slag (wt %). from publication: Study of Mechanical Properties and Durability of …

Frontiers | Factors Affecting Brittleness Behavior of Coal …

2020-9-28 · Coal-Gangue Ceramsite Lightweight Aggregate Concrete Specimen Preparation Process. Since the experiments were performed on CGCLWAC of which the mixing and forming processes were so different from that of common aggregate concrete, the only references were the "Lightweight aggregate concrete technical regulations" (JGJ51-2002) (China standard) and …

Synthesis of zeolite A with high whiteness from coal …

2022-3-7 · The comprehensive utilization of coal gangue (CG) is restricted by color elements in CG including C and Fe x O y.The magnetic separation and hydrothermal acid leaching are combined to pretreat the solid waste CG to synthesize zeolite A with high whiteness.

Chemical Composition of Coal Ashes | Download Table

The coal mining activity involves the release of waste at different levels of its execution, and the largest among such wastes is coal gangue, which accounts for 15% of the total coal produced [3].

EFFECT OF GRAIN COMPOSITION ON STRENGTH AND …

According to the well degree of grain composition and coarse grained content, four groups of grain composition were designed, and using triaxial tests, the strength and deformation characteristics of coal gangue with different grain composition were analyzed. The results reveal that, for coal gangue with different grain composition, the deviatoric stress is increasing with …

How To Effectively Use Coal Gangue?

2021-10-13 · There are several ways to use: 1. Recovery of coal and pyrite: Through a simple process, good coal is washed from coal gangue, low-quality coal is selected from it through screening, and pyrite is selected at the same time. Or recover pyrite, mixed coal and middling coal from the jig used for coal preparation ─ ─ plane shaker process.

The structural and surface properties of natural and …

2017-4-1 · The natural coal gangue has a gray tint, is fissile and laminated with organic substance (coal). The chemical composition (see Table 1) reflects the mineral composition of the coal gangue.The relatively high content of SiO 2, Al 2 O 3 and Na 2 O indicates the presence of quartz, kaolinite, mica and feldspars. The content of K 2 O stems from the presence of illite, …

Minerals | Free Full-Text | Basic Characteristics of Coal …

2021-6-18 · The accumulation/improper treatment of coal gangue will not only lead to waste of land, but also cause environmental pollution. Especially the impact of radioactive elements on the surrounding ecological environment is widely concerned by many scholars. In this study, the concentration of radioactive elements (uranium (U) and thorium (Th)) of small-scale coal …