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Hardgrove Grindability Index Tester - YouTube

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hardgrove grindability index of coal psu

Feb 12, 2021· Hardgrove Grindability Index Standard Reference Samples. Hardgrove Grindability Index Standard Reference Samples In 1930 and 1931, Ralph Hardgrove, a mechanical engineer Overview The Hardgrove Grindability Index Standard Reference Sample (HGI SRS) is a sample of coal used to calibrate instruments that are designed to determine the ease with which coal can be pulverized.

Specifications Guide Global Metallurgical Coal

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 ASSESSED SPECIFICATIONS CSR VM Ash S P TM Fluidity

Hardgrove Grindability Index | Coal Consultant

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, Coal Analysis, Kentucky Geological ...

Oct 07, 2019· In a Hardgrove test, samples are crushed to a specified size, air-dried, and weighed, then run through a laboratory grinding (milling) machine for 60 grinds (rotations). The milled sample is then placed on a sieve of set specifications. The amount of sample that passes through the sieve is used to calculate the Hardgrove grindability index.

Coking Coal – IspatGuru

Apr 05, 2013· The 'Hardgrove grindability index' (HGI) is a good indicator for the expected crushing behaviour of the coal. ... Vitrinite reflectance – It is also known as mean maximum reflectance (MMR) and is used to determine the coal rank. It is measured by the percentage of light reflected off the vitrinite maceral at 500x magnification in oil ...

(PDF) Crushing properties of coal

The Hardgrove grindability index (HGI) is the most expedient. There is a close relation between HGI and the coal quality, as well as the power consumed in grinding.

Metallurgical Coal | Steel360 News

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, i.e. coals with very low and really high rank are harder to grind than middle-rank coking coals.

Semi-soft Coking Coal - i-Energy®

i-Energy is a supplier of this main category of metallurgical- semi-soft coking coal which produces coke of lesser quality. Semi-soft coal normally have lower sales values compared to hard coking coal due to the relative availability of these products.

(PDF) Interrelationships between the Bond Grindability ...

One of them is the Hardgrove grindability index (HGI), associated mainly with vertical spindle mills and the other is Bond's grindability index (Gbg ), associated with tumbling mills (McIntryre and Plitt, 1980; Prasher, 1987). ... Samples of lignite coals in four reflectance ranges, 60–70%, 70–80%, 80–90%, and 90–, were selected ...

Hardgrove Grindability Index Tester with 50g Feed Capacity ...

Hardgrove Grindability Tester measures relative ease of pulverization of coals compared to standard coals in accordance with ASTM D409 Hardgrove Machine Method.The resulting Hardgrove Grindability Index (HGI) provides a measure of the energy required in a grinding process or a measure of yield for given energy input.

LP DAAC - MOD13A2

The Version 6.1 Level-1B (L1B) products have been improved by undergoing various calibration changes that include: changes to the response-versus-scan angle (RVS) approach that affects reflectance bands for Aqua and Terra MODIS, corrections to adjust for the optical crosstalk in Terra MODIS infrared (IR) bands, and corrections to the Terra MODIS forward look-up table (LUT) update for the ...

globalCOAL - About SCoTA

1 Calculated CSR = globalCOAL HCCA MV CSR formula: 425.4*MMR-150.2*(MMR) 2 +4.87*Log(MF) †-12.35*MBI ‡ +2.58*MBI ‡ *Log(MF) †-237.6 † Log(MF) = Log 10 (Maximum Fluidity). Log (MF) of >3.50 must be entered as 3.50 ‡ Modified Basicity Index (MBI) = ((Fe 2 O 3 +K 2 O+Na 2 O+CaO+MgO) / (SiO 2 +Al 2 O 3)) x Ash (db) / (100-VM (db)) x 100 See our Met Coal Calculators to help calculate ...

Characterization and Washability Studies of Raw Coal from ...

MIRL Report No. 88 Characterization and Washability Studies of Raw Coal from the Little Tonzona Field, Alaska P. Dharma Rao Daniel E. Walsh Mineral Industry Research Laboratory University of Alaska Fairbanks Fairbds, Alaska 99775-1180 Norm Phillips, Jr. Kathy (Gom Charlie Doyon, Lid. 201 1st Street Fairbanks, Alaska 99701

Measurement of reflectance of coal macerals: its ...

These include maceral and reflectance analysis, density, various tests of the plastic behavior of coals, Vickers microhardness, and Hardgrove grindability. The ultimate objective of this program is the establishment of interrelationships between coal properties and industrial behavior.

Bituminous coal - Wikipedia

Bituminous coal, or black coal, is a relatively soft coal containing a tar-like substance called bitumen or asphalt.Its quality is ranked higher than lignite and sub-bituminous coal, but poorer than anthracite.Formation 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 ...

The characteristics of American coals in relation to their ...

The data include: proximate analysis, ultimate analysis, sulfur froms analysis, calorific value, maceral analysis, vitrinite reflectance analysis, ash fusion analysis, free-swelling index determination, Gray-King coke type determination, Hardgrove grindability determination, Vicker's microhardness determination, major and minor element analysis ...

Standard Test Method for Hardgrove Grindability Index (HGI ...

1.1 This test method covers the determination of the hardgrove grindability index (HGI) of those petroleum cokes that contain no dedusting additive. The procedure for this test method is the same as in Test Method D409.Sections of this test method contain the significance and use of the HGI of petroleum coke, preliminary sample preparation procedures, and procedure and precision and bias data ...

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Index []

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

Standard Test Method for Hardgrove Grindability Index (HGI ...

Hardgrove Grindability Index (HGI) of Petroleum Coke 1 This standard is issued under the Þxed designation D 5003; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.

Grindability - an overview | ScienceDirect Topics

Grindability index is a measure of the ease of grinding of a given feed. Utility industries use the Hardgrove grindability index (HGI) to express this parameter. In the direct cofired system, the existing mills designed for coal are used for grinding the cofired biomass. So for a given mill, given rotation, and energy input, it is necessary to ...

What is Hardgrove grindability index? - Answers

Dec 26, 2008· The Hardgrove Grindability Index was developed in the 1930s from experimental work by R. Hardgrove to determine the relative difficulty of reducing various coals to …

Theory of Reflectance and Emittance Spectroscopy of ...

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 ...

Hardgrove Grindability Index - Wikipedia

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 ...

ISO 5074:2015(en), Hard coal ? Determination of Hardgrove ...

The Hardgrove grindability test and test machinery are designed and developed to characterize the relative grindability of coals. The Hardgrove grindability index represents a composite physico-mechanical property of the coal, embracing a number of specific properties such as hardness, strength, tenacity and fracture, and is a function primarily of coal rank and secondarily of coal type.

Major Mines & Projects | Springvale Mine

It is highly suitable for domestic power generation without washing. Specific energy averages 34 MJ/kg dry ash-free, ash fusion (hemispherical) is above 1,400 degrees and the coal is hard with an average Hardgrove Grindability Index of 44. Sulphur, phosphorous and chlorine are low, averaging 0.55 %, 0.028 % and 0.05 % respectively.

CONTRIBUTION TO DETERMINATION OF COAL GRINDABILITY …

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).

A review of the correlations of coal properties with ...

May 01, 2014· The spatial arrangement and abundance of the elements: C, H, N, O, S often correlate or directly influence a plethora of coal properties. For > 90 years, attempts have utilized the ultimate (elemental) analysis of coal to predict a wide variety of properties such as: calorific value (higher heating value), volatile matter, vitrinite reflectance (mean maximum), Hardgrove grindability index ...

P The Penn State Coal Sample Bank

calorific value, maceral analysis, vitrinite reflectance (VRo), ash fusion determination, free swelling index, Hardgrove grindability, major inorganic and trace elements, equilibrium moisture, and CO 2. Gieseler plastometry and a standardized liquefaction test …

PHYSICAL PROPERTIES OF ANTHRACITE AND THEIR EFFECT ON ...

Several briquettes were prepared using fine anthracite and binder with cold briquetting process.The physical properties of anthracites such as micro hardness,hardgrove grindability index,true relative density,apparent relative density,porosity,moisture holding capacity and pore structure and so on have been analyzed.The effects of physical properties of anthracites on compressive strength of ...

COAL UTILIZATION CENTER RESEARCH ACTIVITIES

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

Hardgrove Grindability Index HGI | Coal Analysis Testing ...

Hardgrove Grindability Index analysis is the ASTM method of determining the hardness of coal when pulverized for steam generation or size reduction. Grindabilities typically range on coal from 35 – 110. Harder and less grindable coal rates a smaller HGI index number.

Testing Services | HTRCoal

Hardgrove Grindablity Index: ASTM-D409 / ISO-5074. ... Microscopy procedure used to determine the maximum reflectance of light from organic structural components (macerals) of coals. A prepared sample of coal is compressed to form a briquette, which is then polished and vertically illuminated using a microscope fitted with a photometer which ...

Hardgrove grindability index (HGI) - SlideShare

May 01, 2013· Hardgrove grindability index (HGI) 1. PRESENTATION TOPICHARDGROVE GRINDABILITY INDEXAND EFFECT OF COAL BLENDIN ON ITPRESENTATED BYKOMAL AROOSH(2010-2012)DEPARTMENTCENTER FOR COAL TECHNOLOGYPUNJAB UNIVERSITY LAHORE 2. GRINDABILITY OF COALThe measure of the coal resistanceto crushing is said to be the …

427 Exam 1 PWP 1 Flashcards | Quizlet

What is the standard for reflectance? vitrinite reflectance. What is reflectance used for? evaluate thermal maturation of petroleum source rocks. ... A high index on the Hardgrove Grindability Index means >50 coal is easily ground. How does modern coal …

Hardgrove-Index (HGI) ASTM D 409 2012-09 ISO 501 2009-10 ISO 7404-5 issue date base unit ar ma% ad d % HGI FSI °C N Standard 27 011 290 Value 1 Value 2 zu-score comment Method Lab [email protected] Eingesetzte Geräte Kommentar: MR = Minimum requirement for the result (significant digits, precision)

Metallurgical Coal – IspatGuru

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 ...

Estimation of some coal parameters depending on ...

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 …