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ygp index of coal vs hgi of coal

ygp index of coal vs hgi of coal

YGP Index of Coal - bulk-online

2009-9-10  Coal grind ability index HGI (YGP) indicates the ease for grinding coal.. The bigger of grind ability index, the easier to be grinded. Hardgrove Grindability Indices indicate that how hard the the coal is. The variation of HGI of each zone of 40 -60 means that the grindability is poor.

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Bond Index Hardgrove Grindability Index Tests for ...

2014-11-11  grindability test for coal is the Hardgrove Grindability Index Test (HGI) [3] The HGI of binary coal blends cannot be predicted from the weighted average of the individual coals in the blend [4, 5] HGI values become an ineffective measure of grinding behaviour as coal

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Hardgrove Grindability Index - CR4 Discussion Thread

2013-3-17  09/23/2010 5:55 AM. HGI is a measurement (or empirical indication) of the difficulty of grinding a product. It was designed for coal, but is now applied to a variety of mineral products in order to properly dimension a grinding installation (i.e. a mill). It is not directly related to a product abrasiveness.

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CONTRIBUTION TO DETERMINATION OF COAL

2008-10-30  of Hardgrove Grindability Index (HGI) values to Bond Work Index (Wi). Paper also provides information on ... difference in grinding capacity of coal with a HGI value of 40 and 50 is very sgnificant, but the difference between the value HGI 90 and HGI 100 is almost negligible (ACARP Report, 1998).

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ygp index of coal definition - BINQ Mining

2013-4-23  Report of The Group for Studying Range of. 19 Apr 2011 2 Impact of Blended coal Firing on Boiler Performance 2. 3 Blending .. YGP Index is a measure of the coal

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Studies of the relationship between coal petrology and ...

2003-5-1  1.. IntroductionThe relationship between Hardgrove grindability index (HGI) and coal petrology was explored by Hower et al. (1987) and Hower and Wild, 1988, Hower and Wild, 1994. Hower (1998) summarized previous work at the Center for Applied Energy Research, as well as work conducted in other laboratories, and the reader is referred to that paper for an extensive discussion of the ...

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Hardgrove Grindability Index (HGI) Vs. Anthracite Quality ...

2012-8-31  I believe the lower the HGI value, the harder the coal. I was also wondering if a simple (poor mans) hardness test of one coal vs. another would be possible, such as putting like size pieces of each back to back (or coal on coal) in a vice and slowly close the

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Grindability - an overview ScienceDirect Topics

One of the most commonly used methods is the Hardgrove Grindability Index (HGI). HGI for coal is determined by grinding 50 g of sample in a ball and ring type mill for 60 revolutions, after which the product is sieved through a 200 mesh sieve (75 micron screen) (Speight, 1994). HGI is computed by measuring the undersize of the product.

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(PDF) South African coal and its abrasiveness index ...

The Yancey, Geer and Price (YGP) abrasion index has been used for many years to assess the abrasive nature of a coal. The index is clearly related to the mineral matter in the coal

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RELATIONSHIPS AMONG COKING COALS AND RELATED

2018-10-10  From 61 coking coals, 36 coal blends were prepared. Using a pilot coke oven, cokes were prepared from both 61 coking coals (Type I cokes) and 36 coal blends (Type II cokes). Coals were characterized by 14 coal characteristics and cokes by Coke Reactivity Index CRI and Coke Strength after Reaction with CO2 CSR. For the study of mutual statistic ...

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ygp index of coal - BINQ Mining

2006-6-26  YGP Index of Coal – bulk-online Forums – The Powder/Bulk Portal. 26 Jun 2006 HI members, please give me info about YGP index of coal,testing procedure,test code,and equipment supplier. thanks in advance. »More detailed

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Hardgrove Grindability Index - CR4 Discussion Thread

2013-3-17  09/23/2010 5:55 AM. HGI is a measurement (or empirical indication) of the difficulty of grinding a product. It was designed for coal, but is now applied to a variety of mineral products in order to properly dimension a grinding installation (i.e. a mill). It is not directly related to a product abrasiveness.

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(PDF) South African coal and its abrasiveness index ...

The Yancey, Geer and Price (YGP) abrasion index has been used for many years to assess the abrasive nature of a coal. The index is clearly related to the mineral matter in the coal, but a direct ...

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Assessment and prediction of coal abrasiveness - ScienceDirect

1990-9-1  Therefore, the probability of contact between an abrasive particle and the YGP blades is proportional to the volume concentration of the abrasive constituents in the coal. The volume abrasion index (VAI) of the coal, expressed as the g metal loss per m3 of coal, is equivalent to AI

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Hardgrove grindability index (HGI) - SlideShare

2013-5-1  CALCULATIONSThe hard groove grind ability index of coal is thancalculated using the following formula.HGI = 13 + 6.93 wWhere,w = weight of the test sample passingthrough 75μ sieve and retained on 300 μsieve after grinding in the HGImachine. 10. FACTORS

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Hardgrove Grindability Index (HGI) Vs. Anthracite Quality ...

2012-8-31  I believe the lower the HGI value, the harder the coal. I was also wondering if a simple (poor mans) hardness test of one coal vs. another would be possible, such as putting like size pieces of each back to back (or coal on coal) in a vice and slowly close the jaws, watching which piece crushes first in the process.

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Hardgrove Index

2015-1-18  Dear Experts, I am working in Bulk handling equipment company one of our client specfication given hardgrove index for designing the bucket wheel cutting force. I am not able to understand how hardgrove index no convert in cutting resistance of material. The material is coal having density 0.83 T/Cu.mtr. please give me reply if you have.

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RELATIONSHIPS AMONG COKING COALS AND RELATED

2018-10-10  From 61 coking coals, 36 coal blends were prepared. Using a pilot coke oven, cokes were prepared from both 61 coking coals (Type I cokes) and 36 coal blends (Type II cokes). Coals were characterized by 14 coal characteristics and cokes by Coke Reactivity Index CRI and Coke Strength after Reaction with CO2 CSR. For the study of mutual statistic ...

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Specifications Guide Global Metallurgical Coal

2021-5-4  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

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Influence of Geology on CSR.(Coke Strength After

2009-5-1  the Australian coal, Blackwater, from south Queensland, has a vitrinite reflectance of 1.04%, and an inertinite content of 39.0%. According to the NSC prediction such a coal should produce a coke with a CSR of about 50. The actual value of CSR for this coal is 32 (NSC, 1982).

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Assessment and prediction of coal abrasiveness -

1990-9-1  Therefore, the probability of contact between an abrasive particle and the YGP blades is proportional to the volume concentration of the abrasive constituents in the coal. The volume abrasion index (VAI) of the coal, expressed as the g metal loss per m3 of coal, is equivalent to AI x By/1000. 20 40 G0 80 MINERRL MRTTER CONTENT.

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Coal Testing Definition - Spectro

2019-12-31  There is an empirical relationship between HGI value and the rank of the tested Coal; higher the rank of the coal, higher is the HGI value. HGI value is also influenced by the petrographic nature (types of macerals present) of the coal. HGI of bright coals, containing 89-90% Carbon, can reach a

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The Influence of Coal Physical and Mechanical Properties ...

2020-11-4  The Hardgrove Grindability Index was inversely proportional to the coal's ability to be ground. The hardest coal to grind being from mine A (HGI = 38), while the easi­ est coal to grind being from mine C (HGI = 49). The crushing specific energy was the highest one for the coal samples from mine A (0.13 kWh/t). The coals from mines B and Chad ...

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RELATIONSHIPS AMONG COKING COALS AND RELATED

2018-10-10  From 61 coking coals, 36 coal blends were prepared. Using a pilot coke oven, cokes were prepared from both 61 coking coals (Type I cokes) and 36 coal blends (Type II cokes). Coals were characterized by 14 coal characteristics and cokes by Coke Reactivity Index CRI and Coke Strength after Reaction with CO2 CSR. For the study of mutual statistic ...

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hardgrove grindability indexof various limestones ...

15 Oct 2015 ... Bond Work Index BWI and Hardgrove Grindability Index HGI tests for biomass and coal. ... Compared to La Loma HGI of 46 , all biomasses tested performed poorly ... of a wide range of brittle materials, including limestone, subbituminous, ... Determination of Hardgrove grindability index of hard coal; 1995. Get Price

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tim the tuner: HARDNESS OF COAL VS. PRIMARY AIR FLOW

2020-2-28  The Hardgrove Grindability Index (HGI) is an index that pertains to the hardness of the coal, or the ease with which it can be pulverized. An HGI of 45 is harder coal, an HGI of 60 is a much softer coal therefore it grinds much faster. The original PA flow set point curve had been developed for an HGI

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微粉炭焚きボイラーの燃焼技術 - JST

炭,石 炭灰とも20~230mg・Feの 範囲にある。YGP インデックスとHGIは 反比例的な関係にある。YGP インデックスの大きな石炭を使用する場合は微粉炭系 統の摩耗対策に特に留意する必要がある。材料の摩耗 量は一般に粒子速度の3.5乗 に比例するので,摩 耗対

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Blending coal new delhi - slideshare.net

2015-6-26  HGI influences the size and number of the mills to be adopted. Hard Grove Index of Indian coals generally vary from 48 to 65. YGP Index YGP Index is a measure of the coal’s abrasive nature. The YGP index is greatly influ- enced by the contaminants in the coal

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Specifications Guide Global Metallurgical Coal

2021-5-4  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

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Influence of Geology on CSR.(Coke Strength After

2009-5-1  the Australian coal, Blackwater, from south Queensland, has a vitrinite reflectance of 1.04%, and an inertinite content of 39.0%. According to the NSC prediction such a coal should produce a coke with a CSR of about 50. The actual value of CSR for this coal is 32 (NSC, 1982).

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