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the difference between the chemical properties of coal and gangue

Combustion properties of coal gangue using

Apr 01, 2017· 1. Introduction. Coal gangue (CG) is a mixture of organic and inorganic compounds and mineral materials , that are fused together with coal deposits during the coal formation process .CG is a complex industrial solid waste generated from the coal mining and washing process .Because of long-term stacking, spontaneous combustion frequently occurs in coal and carbonaceous materials ; this

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Properties of coal gangue-Portland cement mixture with

Jun 01, 2019· 1. Introduction. Besides oil and natural gas, coal as a fossil fuel has become one of the primary sources of energy for modern civilization .As an industrial solid waste, coal gangue is discharged when coal is excavated and washed in the production procedure , .The average emission of coal gangue is about 15% of total coal production .The annual emission of coal gangue in China has

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Effects of the variety and content of coal gangue coarse

Sep 30, 2019· The two types of coal gangue coarse aggregates used in this study have different grain shapes, densities and crushing values because of the differences in the formation process, production process or porosity. Although there are considerable differences between the properties of S and R, and they are obviously different from those of N.

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Image Recognition of Coal and Coal Gangue Using a

Hobson developed an image processing algorithm to investigate the surface texture properties of coal and gangue and, further, distinguished coal and gangue on the basis of the differences in texture properties between the two materials. There are other reports in the literature referring to coal/gangue image recognition technologies, but these

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Enhanced mechanical properties and durability of coal

Sep 10, 2019· At the same time, there were dramatic differences between coal gangue and cemented soil in acid resistance, although the acid solution could penetrate into the CGRCS interior and corroded both. In the process of erosion, a lot of proton ions in the acid solution could shift the chemical equilibrium and dissolve cemented soil by various forms of

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Mechanical properties and microstructures of hypergolic

Oct 10, 2019· The hypergolic coal gangue is caused by the self-ignition of accumulated coal gangue due to heat accumulation. The content of SiO 2, Al 2 O 3 and CaO in hypergolic coal gangue of this experiment is 64.52%, 15.18%, and 4.65% respectively. The content of CaO is less than 10%, so this hypergolic coal gangue powder belongs to superfine powder.

Effects of chemistry and mineral on structural evolution

The correlation between the composition and properties of coal gangue during calcination is essential for its applications. In this paper, the effect of chemistry and minerals of coal gangues on the thermal behavior, structural evolution and chemical states of silicon and aluminum during the calcination process were systematically investigated.

(PDF) Identification of Coal and Gangue by Feed-forward

Based on the chemical properties of coal and gangue and impact between coal gangue particles and the metal plate is considered here, and the influence of the contact behavior between the

Properties of spontaneous combustion coal gangue from

Properties of coal gangue were of partially oxidized coal. In addition, the differences between the oxidation characteristics of a fresh and a partially oxidized coal sample were studied

Coal Structure and properties of coal | Britannica

Coal Coal Structure and properties of coal: The plant material from which coal is derived is composed of a complex mixture of organic compounds, including cellulose, lignin, fats, waxes, and tannins. As peat formation and coalification proceed, these compounds, which have more or less open structures, are broken down, and new compounds—primarily aromatic (benzenelike) and

Coal Structure and properties of coal | Britannica

Coal Coal Structure and properties of coal: The plant material from which coal is derived is composed of a complex mixture of organic compounds, including cellulose, lignin, fats, waxes, and tannins. As peat formation and coalification proceed, these compounds, which have more or less open structures, are broken down, and new compounds—primarily aromatic (benzenelike) and

Gangue Wikipedia

In mining, gangue (/ ɡ æ ŋ /) is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit.It is thus distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are displaced during mining without being processed, and from tailings, which is rock already stripped of valuable minerals.

Separation of gangue from coal based on supplementary

Owing to the differences in physicochemical properties, coal and gangue exhibit different visual traces in the process of mining and transportation, but the traces appear to be irregular.

Quantitative Inversion of Fixed Carbon Content in Coal

Gangue is the main solid waste in coal mine areas. In China, there are more than 1700 coal waste piles, totaling approximately 4.5 billion tons, with a rate of increase of 350 million tons per year [].The long-term accumulation of a large amount of gangue will have a serious impact on the ecological environment of the mining area [2,3].For example, after rain, harmful substances in coal gangue

Experimental Investigation on Mechanical Properties of In

Cemented paste backfill containing coal gangue and fly ash (CGFACPB) is an emerging backfill technique for coal mines that allows environmentally hazardous coal gangue and fly ash to be reused in the underground goaf. Meanwhile, CGFACPB can provide an efficient ground support and reduce the surface subsidence. Due to the difference of consolidation environment between the laboratory and

Mechanical and Acoustic Emission Behavior of Gangue

The chemical component of gangue is shown as Table 3. It indicates that, in coal gangue, SiO 2 has the highest content, and the higher content of SiO 2 is also often observed in the gravel. The high content of SiO 2 shows that the coal gangue can be used as the concrete aggregate. However, the gangue contains few easily weathered and hydrolyzed

Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and

To reduce the amount of cement used in cemented coal gangue backfill (CCGB, a mixture of coal gangue, cement, fly ash, and water), mechanical and deformation properties of CCGB in which CSFA partially replaces the cement (0, 10, 20, 30, and 40 wt%) were studied. Compressive strength, acoustic emission during uniaxial loading, shear strength, and drying shrinkage were analysed.

Sustainability | Free Full-Text | Effect of Bactericides

Oxidation of pyrite in the coal gangue dumps usually results in acidification and spontaneous combustion, causing many environmental problems such as air, soil, and water pollution. The oxidizing bacteria exacerbate problems such as acidification, spontaneous combustion, and explosions. The bacterium Acidithiobacillus ferrooxidans was first separated and isolated from coal gangue samples.

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COAL CHARACTERISTICS Purdue University

It contains between 86% and 98% carbon by weight, & it burns slowly, with a pale blue flame & very little smoke Bituminous coal (in Indiana), contains between 69% & 86% carbon by weight Sub-bituminous coal contains less carbon, more water & is a less efficient source of heat Lignite coal, or brown coal, is a very soft coal that

Microstructure of Coal Gangue and Precipitation of Heavy

Table 2 shows that in the material composition of coal gangue, SiO 2 is the main component with high content, accounting for 59.9% and 53.7% of the fresh and weathered coal gangue, respectively. The secondary element is Al 2 O 3, accounting for 20.7% and 17.6% of fresh and weathered coal gangue, respectively.The contents of SiO 2, Al 2 O 3, and S in the weathered coal gangue are lower than

Excess sulfur and Fe elements drive changes in soil and

Jun 26, 2020· Coal gangue piles accumulate outside mines and can persist for years, negatively impacting the regional environment. To determine the main cause of soil pollution at coal gangues, several coal

Effects of chloride on the early mechanical properties and

May 19, 2020· Z. Cao, N. Jiang, X.Q. Jiang, B.L. Zhang, Q.F. Wang, Study on proportion experiment and phy-chemical properties of coal gangue paste backfilling materials, Safety in Coal

Impact-Crush Separation Characteristics of Coal and Gangue

Utilizing the difference in hardness, coal and gangue can be separated by the impact-crush technology for utilization underground. The influence of hardness and impact velocity on the crush-ratio

Coal assay Wikipedia

Chemical properties of coal. Coal comes in four main types or ranks: lignite or brown coal, bituminous coal or black coal, anthracite and graphite.Each type of coal has a certain set of physical parameters which are mostly controlled by moisture, volatile content (in terms of aliphatic or aromatic hydrocarbons) and carbon content.. Moisture. Moisture is an important property of coal, as all

Trace Elements in Coal Gangue: A Review | IntechOpen

Apr 13, 2017· 2.1. The mineral and chemical composition of coal gangue. Generally, the main mineral phases of coal gangue are kaolinite, quartz, pyrite, illite, calcite, ankerite, and montmorillonite [36, 37].The coal gangue samples are usually dominated by silicon dioxide and aluminum oxide, followed by ferric oxide and potassium oxide accompanied with some trace elements [].

Image Recognition of Coal and Coal Gangue Using a

Hobson developed an image processing algorithm to investigate the surface texture properties of coal and gangue and, further, distinguished coal and gangue on the basis of the differences in texture properties between the two materials. There are other reports in the literature referring to coal/gangue image recognition technologies, but these

Coal assay Wikipedia

Chemical properties of coal. Coal comes in four main types or ranks: lignite or brown coal, bituminous coal or black coal, anthracite and graphite.Each type of coal has a certain set of physical parameters which are mostly controlled by moisture, volatile content (in terms of aliphatic or aromatic hydrocarbons) and carbon content.. Moisture. Moisture is an important property of coal, as all

Experimental Investigation on Mechanical Properties of In

Cemented paste backfill containing coal gangue and fly ash (CGFACPB) is an emerging backfill technique for coal mines that allows environmentally hazardous coal gangue and fly ash to be reused in the underground goaf. Meanwhile, CGFACPB can provide an efficient ground support and reduce the surface subsidence. Due to the difference of consolidation environment between the laboratory and

Effects of chloride on the early mechanical properties and

May 19, 2020· Z. Cao, N. Jiang, X.Q. Jiang, B.L. Zhang, Q.F. Wang, Study on proportion experiment and phy-chemical properties of coal gangue paste backfilling materials, Safety in Coal

Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and

To reduce the amount of cement used in cemented coal gangue backfill (CCGB, a mixture of coal gangue, cement, fly ash, and water), mechanical and deformation properties of CCGB in which CSFA partially replaces the cement (0, 10, 20, 30, and 40 wt%) were studied. Compressive strength, acoustic emission during uniaxial loading, shear strength, and drying shrinkage were analysed.

Minerals | Free Full-Text | Embankment Displacement PLAXIS

Firstly, the authors should explain how the difference between the mechanical properties of old and new coal gangue layers is introduced in the model. Secondly, explain if the simulate of interface between the new and the old coal gangue layer is necessary or not. Line 157: the authors referred to maximum horizontal and vertical displacements.

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COAL CHARACTERISTICS Purdue University

It contains between 86% and 98% carbon by weight, & it burns slowly, with a pale blue flame & very little smoke Bituminous coal (in Indiana), contains between 69% & 86% carbon by weight Sub-bituminous coal contains less carbon, more water & is a less efficient source of heat Lignite coal, or brown coal, is a very soft coal that

Microstructure of Coal Gangue and Precipitation of Heavy

Table 2 shows that in the material composition of coal gangue, SiO 2 is the main component with high content, accounting for 59.9% and 53.7% of the fresh and weathered coal gangue, respectively. The secondary element is Al 2 O 3, accounting for 20.7% and 17.6% of fresh and weathered coal gangue, respectively.The contents of SiO 2, Al 2 O 3, and S in the weathered coal gangue are lower than

The Environmental Geochemistry of Trace Elements and

Aug 28, 2014· The properties of coal gangue. The main chemical compositions of coal gangue are SiO 2, Al 2 O 3, Fe 2 O 3 and CaO, which occupies 58, 24, 7

Performance of Coal Gangue-Based Cemented Backfill

Coal gangue-based cemented backfill material (CGCBM) is developed for backfilling the goaf in coal mines. As fresh CGCBM slurry is generally transported into underground openings through a pipeline, and after hardening, it plays the role of supporting the overlying strata. The fluidity, stability, and mechanical (compressive strength) of CGCBM become the most important properties.

Thermogravimetric analysis of the co-combustion of coal

Oct 28, 2019· Introduction. Coal gangue (CG) is a common industrial solid waste. An economical, reliable, and comprehensive method to utilize this waste is to burn it for electricity generation [1,2].Owing to its ignition difficulty, unstable combustion, and low calorific value [], researchers worldwide have investigated the combustion and co-combustion characteristics of CG.

What are the types of coal? USGS

The biggest coal deposit by volume is the Powder River Basin in Wyoming and Montana, which the USGS estimated to have 1.07 trillion short tons of in-place coal resources, 162 billion short tons of recoverable coal resources, and 25 billion short tons of economic coal resources (also called reserves) in

Effects of Fine Gangue on Strength, Resistivity, and

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 28 d curing times, respectively.