Ro Mean Max Mean maximum vitrinite-reflectance value (ASTM D 388-92, D 2798-91) Moisture Proximate analysis, as received basis (ASTM D 3173- 87 or , FSI Free-Swelling Index (ASTM D 720-91) Hardgrove Grindability Index (ASTM D 409-92) Initial Deformation Reducing (Ash) Ash Fusibility Temperatures (ASTM D
Sep 25, 2018· Metallurgical coal possesses the ability to soften and re-solidify into a coherent, porous mass, when heated from 300 deg C to 550 deg C in the absence of air in a confined space The conversion from coal to coke occurs in chambers called coke ovens where the volatiles from the coal escape, leaving behind what is referred to as metallurgical .
Evaluation of this combination (GA-ANFIS) showed that the GA-ANFIS approach can be utilized as an efficient tool for describing and estimating some of coal variables such as Hardgrove grindability index, gross calorific value, free swelling index, and maximum vitrinite reflectance with various coal analyses (proximate, ultimate, elemental, and .
estimating some of coal variables such as Hardgrove grindability index, gross calorific value, free swelling index, and maximum vitrinite reflectance with various coal analyses (proximate, ultimate, elemental, and petrographic analysis) Statistical factors (correlation coefficient, mean square error, and ,
Mar 10, 2017· Posts about Hardgrove Grindability Index written by johnsmt Jenis analisa atau parameter untuk menentukan kualitas suatu batubara banyak sekali baik analisa fisik atau disebut physical property, chemical property, pilot scale test, dll Contoh yang masuk kedalam physical property misalnya; HGI, Sieve analysis, Drop shatter, Bulk density dan lain-lain
Hardgrove grindability index (HGI) is determining factor of energy consumption during grinding The HGI value is used for more detailed coal , reflectance of vitrinite The grindability is significantly influenced also by the contents of ash in coal (Dinterová, 1976; Wang, 1996)
Abstract A prime objective of the Pennsylvania State University's DOE program is the characterization of 1,300 samples of US coals Reflectance determination plays a major role in meeting this objective, because it is used as an accurate rank index both to select coals for testing and to investigate property-behavior interrelationships using the Penn State/DOE Coal Data Base
The theory of reflectance and emittance spectroscopy is based on the fundamental principles of radiative transfer (the propagation of energy in the form of electromagnetic radiation) in particulate media , namely the complex index of refraction, and the scattering of light controlled by particulate texture, shape, and size , Hardgrove, C .
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An index of vitrinite reflectance is used by coal scientists to determine the level of heat, or maturity, to which coals and other organic matter, such as petroleum, have been subjected Liptinite develops from waxy or oily plant parts such as spores, algae, and resin; the liptinite group contains several subgroups based on these original plant .
Bituminous coal or black coal is a relatively soft coal containing a tarlike substance called bitumen or asphaltIt is of higher quality than lignite and Sub-bituminous coal, but of poorer quality than anthraciteFormation is usually the result of high pressure being exerted on lignite Its coloration can be black or sometimes dark brown; often there are well-defined bands of bright and dull .
Reflectance Spectroscopy Measurement Reflectance was measured in the 350–2500 nm wavelength range by a FieldSpec 3 spectroradi- ometer (Analytical Spectral Devices Inc, USA) with a contact probe under standard laboratory conditions , Gopalakrishna SJ (2009) Hardgrove grindability index prediction using support vector regression Int J .
Dec 06, 2014· 2 Hardgrove Grindability Index (HGI): It provides a criterion of the ease of pulverization of coal Ease of grinding is an important economic consideration Grindability changes with coal rank, ie coals with very low and really high rank are harder to grind than middle-rank coking coals
40 the Hardgrove Grindability Index (HGI) of willow heated at 240 ˚C and 290 ˚C for 10 and 60 minutes by using a 41 Retsch ball mill The higher temperatures and longer residence times improved the grindability Abdullah and 42 Wu  investigated the thermal pre- treatment (300-500 ˚C) of mallee wood in a fixed-bed reactor A laboratory 43
FSI: Free swelling index GAD: Gross air dried HGI: Hardgrove grindability index MMR Ro Max: Mean max reflectance S: Sulfur TD: Total dilatation TM: Total moisture VM: Volatile matter DEFINItIONS OF thE tRADING LOCAtIONS FOR WhICh PLAttS PUBLIShES INDEx AND ASSESSmENtS ASSEDSSE SPECIFICAtIONS CSR Vm Ash S P tm Fluidity
Hardgrove Grindability Index Tester The Hardgrove grindability index tester for coal adds a push-up bowl mechanism to the bottom of the body and the grinding bowl, and uses an electronic digital display speed controller, which solves the cumbersome work of holding the bowl on the hand during operation
Hardgrove Grindability Index (short HGI) is a measure for the grindability of coal Grindability is an index, therefore it has no unit The smaller the HGI, the harder is coal texture and less grindable is the coal Grindability is an important factor for the design a coal mill As grindability depends on many unknown factors, HGI is determined .
The Hardgrove grindability index (HGI) is a widely used coal-quality parameter with applications in coal mining, beneficiation, and utilization An understanding of the petrology of the coal is fundamental to understanding the validity of the HGI in the given application The HGI varies with coal rank, increasing (greater ease of grinding) with increasing rank through the high-volatile .
Hardgrove Grindability Index, 24 maceral analysis, 24 moisture, 23, 36-37 sulfur, 23-24 trace elements, 24 ultimate analysis, 24 vitrinite reflectance, 24-25 volatile matter, 23 Annular space, 46 API gamma-ray unit, 46 Apparent density, 30—31, 46 Apparent rank, 37, 46 Ash, 46 composition, 24 fusion temperatures, 24 variations, 20-22 yield, 23
reflectance no less than 06) reserves because these coals are currently the major feedstock for power plants, industrial boilers and coking plants Bituminous coals and anthracites account for around half of the world’s proven reserves of 847 Gt, which are adequate to meet projected growth in coal demand through to 2035 (IEA, 2010)
Hardgrove grindability index Data Seams 2 I I 1 I 2 13 11 5 11 10 18 2and5 4 2 2 4 IVll"l1u,', nueu MPCF HGI Note: Vitrinite andexinite wereincluded intheregression analyses torepresent thereactive macerals minus thereactive semi-fusinite Itshould
Coal petrography is a microscopic technique used to determine a coal’s rank (degree of coalification) and type (amount and category of macerals) Producers and users of coal and coke rely on SGS, an industry leader in coal petrology, for independent, globally recognized coal petrographic analysis
Feb 18, 2015· In order to monitor Potentially Toxic Elements (PTEs) in anthropogenic soils on brown coal mining dumpsites, a large number of samples and cumbersome, time-consuming laboratory measurements are required Due to its rapidity, convenience and accuracy, reflectance spectroscopy within the Visible-Near Infrared (Vis-NIR) region has been used to predict soil constituents This study ,
Intertek provides quality and quantity testing and inspection for petroleum coke (pet-coke), metallurgical coke (met-coke) and fly ash products Products tested and inspected include petroleum coke, metallurgical coke, and bitumen analysis ASTM, ISO, and other industry pet-coke and fly ash test methods are used
Hardgrove Grindability Index Particle Size Reflectance Maceral Composition Moisture Content Ash/Mineral Matter Content Surface Area Porosity C, H, N, O, and S Content Calorific Value (Btu/lb) Mineral Matter Composition Free Swelling Index Ash Fusion Temperature Profile Solid Liquid Mixtures: Percent Solids Particle Size Distribution Rheology
Pairs of alternating high- and low-index layers compose the reflector The example of an alldielectric laser reflector for 1064 nm, shown in -, has a theoretical reflectance maximum Figure 1 reflectance of 9988% However, in practice R will be less likely to scatter and achieve non-zero absorption Laser
Hansen, AE, Hower, JC, Notes on the relationship between microlithotype composition and Hardgrove grindability index for rank suites of Eastern Kentucky (Central Appalachian) coals: International Journal of Coal Geology, v 131, p 109-112
What is Hardgrove Index ? - bulk-online Forums for limestone what is the Hardgrove Index ? , of 74 micrometres, or 0003 inch) is used to calculate the Hardgrove grindability index (HGI) Read more
publishes index and assessments 2 Assessed specifications 2 Seaborne hard coking coal 3 Seaborne PCI coal 6 Penalties and Premia for Seaborne HCC 7 Brand Relativities 8 Semi-Soft Coking Coal 10 Metallurgical Coke 11 Derivatives 13 Domestic Chinese 14 Revision history 17 Specifications Guide Global Metallurgical Coal Latest update: April 2021