Hardgrove Index Reflectance

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Grindability - an overview | ScienceDirect Topics

The Hardgrove Grindability Index. The Hardgrove Grindability Index (HGI) is used to determine the grindability of the coal. This index is important for gasifiers that require fine coal as feed, as with entrained flow gasifiers. For slurry-fed entrained flow gasifiers there is a trade-off regarding the grindability of a coal; a higher solid concentration with a coarser coal slurry may be produced, but larger particles will not …

CONTRIBUTION TO DETERMINATION OF COAL GRINDABILITY …

specification of grindability by Hardgrove are applied more frequently. Hardgrove grindability index (HGI) is determining factor of energy consumption during grinding. The HGI value is used for more detailed coal specification and is significant also for the design of capacity of particularization equipment and …

Evaluation of parameters to determine the degree of coal ...

The analysis showed that there is a direct relationship between the results of the Hardgrove mill index and the degree of explosiveness in the fraction corresponding to 200 mesh, meaning that a higher rate of milling the greater the degree of explosiveness; a direct relationship between calorific inertinite content range and also observed. The 325 mesh fraction for all samples showed the same degree of …

globalCOAL - About SCoTA

Hardgrove Grindability Index (HGI) 45 – 70: Nominal Topsize: 50 mm: IDT: Min 1,200 °C in a reducing atmosphere: Chlorine (DB) 0.3% Max: Fluorine (DB) 200µg/g Max: Phosphorous (DB) 0.15% Max: Mercury (DB) 0.6µg/g Max: Arsenic (DB) 80µg/g Max: Size restriction

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 Peak Downs Region: 74% 20.70% …

Coking Coal – IspatGuru

05.04.2013· The ‘Hardgrove grindability index’ (HGI) is a good indicator for the expected crushing behaviour of the coal. The high HGI of a soft coal allows a crusher to be operated at a higher throughput with the same or lower power requirement. The size distribution of the coal is important since it can impact on the coal handleability in the bins/silos and in transfer conveyors.

Spectrophotometric Methods of Refractive Indices Measurement

refractive index n of the material through equation 1 (2): Θ B = arctan (n/n 0) where n 0 is refractive index air (n 0 =1). To determine the values of the refractive index, we measured the spectral dependencies of the reflection coefficient at different angles of incidence of p- polarized light. Figure 3

Metallurgical Coal – IspatGuru

25.09.2018· The Hardgrove Grindability Index (HGI) is a good indicator for the expected crushing behaviour of the coal. The high HGI of a soft coal allows a crusher to be operated at a higher throughput with the same or lower power requirement. The size distribution of the coal is important since it can impact on the coal handleability in bins and in transfer conveyors.

Refractive Index Database – Table of Refractive Index ...

Refractive Index Database. The table below contains links to refractive index data for common materials. Each material in the database has refractive index listed as a function of wavelength over a range typically required for thin-film thickness measurement. λ (nm)

Coke – nature, production, applications and coking coal ...

• coal having mean reflectance of more than 0.60 and swelling Index or CSN of 1 and above ( Indian Gov ) • Coking coals are those coals that soften, swell and then solidify as they are heated through the temperature range 350°C to 550°C. By definition these coals all have a low ash content (1 – 10%), have low permeability as determined

Evaluation of parameters to determine the degree of coal ...

carbon, total sulfur and calorific value ); petrographic (maceral counting and vitrinite reflectance) and Hardgrove mill index. The samples were crushed to obtain fractions corresponding to meshes 200, 270 and 325 considering those sizes could give greater risks of explosion. The analysis showed that there is a direct relationship between the results of the Hardgrove mill index and the degree ...

(PDF) Hardgrove grindability index prediction using ...

Hardgrove grindability index (HGI) measures the grindability of coal and is a qualitative measure of coal. It is referred to in mining, beneficiation and utilization of coal.

Thermal Maturity - an overview | ScienceDirect Topics

Relationship of Hardgrove grindability index to coal rank and coal type. ... presence of hydrogen- and aliphatic-rich vitrinite originating from a particular flora. Vitrinite reflectance suppression occurs on deposition of sediments and reflectance is reduced through burial until the hydrogen/bitumen is removed from the structure. In contrast, Carr (2000) defined vitrinite reflectance ...

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 pétrographie analysis). Statistical factors (correlation coefficient, mean square error, and variance accounted for) and differences between actual and predicted values demonstrated ...

Index [www.astm.org]

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 As-received basis, 31, 46 ASTM D 388, 37 ASTM D ...

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 Peak Downs Region: 74% 20.70% …

Metallurgical Coal – IspatGuru

25.09.2018· The Hardgrove Grindability Index (HGI) is a good indicator for the expected crushing behaviour of the coal. The high HGI of a soft coal allows a crusher to be operated at a higher throughput with the same or lower power requirement. The size distribution of the coal is important since it can impact on the coal handleability in bins and in transfer conveyors.

Metallurgical Coal | Steel360 News

06.12.2014· 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. 3. Ash: It is the inorganic residue left after the incineration of coal of constant weight under standard ...

Hardgrove Grindability Index | Coal Consultant

10.03.2017· • Hardgrove Grindability Index. Moisture . Moisture di dalam batubara dapat dibagi menjadai dua bagian yaitu inherent moisture dan extraneous moisture. Dua istilah tersebut di atas merupakan istilah pengertian bukan istilah parameter. Inherent moisture adalah moisture yang terkandung dalam batubara dan tidak dapat menguap atau hilang dengan pengeringan udara atau air …

Semi-soft Coking Coal - i-Energy® - INRL

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. Integrated steel mills will optimize the use of semi-soft coal in order to reduce overall costs.

(PDF) Hardgrove grindability index prediction using ...

Hardgrove grindability index (HGI) measures the grindability of coal and is a qualitative measure of coal. It is referred to in mining, beneficiation and utilization of coal.

(PDF) The Variation of Hardgrove Index and Coal ...

Hardgrove Index is the measure of the amount of energy needed to grind (grindability) a coal. If coal is too hard, then the Hardgro ve Index vallie is low, so if requires more power for the mill. In general the range of HGI values between 30-120.

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 pétrographie analysis). Statistical factors (correlation coefficient, mean square error, and variance accounted for) and differences between actual and predicted values demonstrated ...

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 variance accounted for) and differences between actual and predicted values demonstrated ...

Index [www.astm.org]

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 As-received basis, 31, 46 ASTM D 388, 37 ASTM D ...

Metallurgical Coal – IspatGuru

25.09.2018· The Hardgrove Grindability Index (HGI) is a good indicator for the expected crushing behaviour of the coal. The high HGI of a soft coal allows a crusher to be operated at a higher throughput with the same or lower power requirement. The size distribution of the coal is important since it can impact on the coal handleability in bins and in transfer conveyors.

Metallurgical Coal | Steel360 News

06.12.2014· 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. 3. Ash: It is the inorganic residue left after the incineration of coal of constant weight under standard ...

Hardgrove Grindability Index | Coal Consultant

10.03.2017· • Hardgrove Grindability Index. Moisture . Moisture di dalam batubara dapat dibagi menjadai dua bagian yaitu inherent moisture dan extraneous moisture. Dua istilah tersebut di atas merupakan istilah pengertian bukan istilah parameter. Inherent moisture adalah moisture yang terkandung dalam batubara dan tidak dapat menguap atau hilang dengan pengeringan udara atau air …

Laboratory Services - cmpdi

• Random reflectance of vitrinite(Rr%) • Mean maximum reflectance of vitrinite (Rv max %) ... Cavability Index of underground mines and Subsidence Prediction for a mine is also done. 7. Central Mine Planning and Design Institute Limited Testing FacilitiesTesting Facilities • Bulk Density • Unconfined Compressive Strength • Tensile Strength • Shear Strength • Protodyakonov ...

Semi-soft Coking Coal - i-Energy® - INRL

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. Integrated steel mills will optimize the use of semi-soft coal in order to reduce overall costs.