PRODUCTS

search results - HGI of coal

search results - HGI of coal

search results - HGI of coal
Application

Hardgrove Grindability Index (HGI) | SGS India Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will per

search results - HGI of coal

  • Hardgrove Grindability Index (HGI) | SGS India

    Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will perform in their mills, allowing them to estimate grinding power requirements and throughput capacities SGS is a world leader in coal and coke testing services Our coal testing procedures are completed globally by technical experts in stateoftheart facilities SGS testing results01/05/2013· It provides information for determining grindingpower consumption and pulverizing capacitiesHGI of coal depends on the coal composition 5 • It can be used by industry to determine powerconsumption during the grinding process• Usually softer coals have higher HGI Somephysical properties of coal such ashardness, tenacity and fracture can also beshown by it Between grindabilityHardgrove grindability index (HGI) SlideShare20/04/2002· For this both HGI and friability are less but with progressive rank evolution and progressive elimination of the above oxygen groups coal from 85–89% carbon (dmmf) with less than 2% moisture and 14–31% volatile, HGI and friability attain maximum value making coals of these categories softer and liable to be more hazardous from the dust emission point of view Incidentally, for medium andAn assessment of grindability index of coal ScienceDirect

  • What is the HGI of coal? Quora

    Answer (1 of 3): 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 millIndex 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 properties move away from the norm [6] Test conducted according to BS 1016112:1995 [3] and conducted at Environmental Scientific Group, Bretby, UK 50g ± 001g of sample (118mmBond Index & Hardgrove Grindability Coal Research Forumcomponent coal HGI’s becomes greater Because of these and other limitations the standard test is not highly precise, repeatability between successive samples on the same test machine being 2 units and reproducibility between laboratories being 4 units Notwithstanding these limitations HGI is seen to be generally effective for internationally traded coals, becoming less precise as theUNIT 1 HARDGROVE GRINDABILITY INDEX

  • An assessment of grindability index of coal ScienceDirect

    20/04/2002· For this both HGI and friability are less but with progressive rank evolution and progressive elimination of the above oxygen groups coal from 85–89% carbon (dmmf) with less than 2% moisture and 14–31% volatile, HGI and friability attain maximum value making coals of these categories softer and liable to be more hazardous from the dust emission point of view05/09/2014· HGI in Coal or the Hardgrove Grindability Index Testing of coal is used to determine the ease with which coal can be ground up into smaller particles When coal is in large pieces, it is burnt less efficiently In industry, energy can be more easily obtained from burning coal when coal is in a powdered form The Hargrove test was developed in the 1930s It is used in manyHGI In Coal Hardgrove Grindability Index Testing of CoalAnswer (1 of 3): 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 millWhat is the HGI of coal? Quora

  • Hardgrove Grindability Index (HGI) | SGS Indonesia

    Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will perform in their mills, allowing them to estimate grinding power requirements and throughput capacities SGS is a world leader in coal and coke testing services Our coal testing procedures are completed globally by technical experts in stateoftheart facilities SGScomponent coal HGI’s becomes greater Because of these and other limitations the standard test is not highly precise, repeatability between successive samples on the same test machine being 2 units and reproducibility between laboratories being 4 units Notwithstanding these limitations HGI is seen to be generally effective for internationally traded coals, becoming less precise as theUNIT 1 HARDGROVE GRINDABILITY INDEXin coal increases the HGI value, whereas the micronite and liptinite macerals decrease the grindability (Hsieh, 1976; Hower, 1987) On the basis of research of black coal from Kentucky Hower and Wild (1988) have derived that part of the HGI change can be explained by maceral composition, mainly by liptinite contents, which is the most important maceral group affectingCONTRIBUTION TO DETERMINATION OF COAL GRINDABILITY

  • Standard Test Method for Hardgrove Grindability Index (HGI

    comparison with coal standards The higher the HGI value, the easier the petroleum coke is to grind 314 petroleum coke , nÑsolid, carbonaceous residue produced by thermal decomposition of heavy petroleum fractions or cracked stocks, or both 315 raw petroleum coke Ñpetroleum coke that has not been calcined 1 This test method is under the jurisdiction of ASTM11 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 D409Sections of this test method contain the significance and use of the HGI of petroleum coke, preliminary sample preparation procedures, and procedure andStandard Test Method for Hardgrove Grindability Index (HGI31/08/2012· 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 The one that crushes first (or most) would presumablyHardgrove Grindability Index (HGI) Vs Anthracite Quality

  • Calorific Value of Coal

    Coal is generally analysed to determine its physical, chemical, thermal, mechanical properties like size consist, proximate values, ultimate values, calorific value and HGI Calorific Value (CV) is an important thermal property of coal which indicates the amount of heat energy that could be liberated on combustion of a specific quantity The other important thermal properties of coalHardgrove Grindability Index (HGI) The Hardgrove Grindability Index (HGI) is a measure of coal’s resistance to crushing Grinding studies, and the resulting HGI, allow many different types of coal users to evaluate how coals will perform inHardgrove Grindability Index (HGI) | SGS PakistanHGI is related to rank, moisture content, and ash (mineral) content (Sinha et al, 1962; Stach and others, 1982; SuárezRuiz and Crelling, 2008) In general, coals become more easily grindable through rank until they reach approximately 89 to 90 percent carbon in the semianthracite rank , at which point coal is increasingly harder to grindHardgrove Grindability, Coal Analysis, Kentucky Geological

  • Hardgrove grindability index and petrology used as an

    Through treating coal with a swelling agent prior to grinding, the grindability of coals can be considerably improved The Hardgrove Grindability tests show that the HGI of a KY No 9 coal increases from 41 for the untreated coal to 6090 after swelling pretreatment for a short timecomponent coal HGI’s becomes greater Because of these and other limitations the standard test is not highly precise, repeatability between successive samples on the same test machine being 2 units and reproducibility between laboratories being 4 units Notwithstanding these limitations HGI is seen toUNIT 1 HARDGROVE GRINDABILITY INDEXThe HGI varies with coal rank, increasing (greater ease of grinding) with increasing rank through the highvolatile bituminous rank range; and the HGI varies with changes in the maceral and(PDF) An Assessment of Chemical Properties and

  • CONTRIBUTION TO DETERMINATION OF COAL

    The HGI value is an important parameter characterizing especially the coal in terms of easiness of its particularization In spite of some negatives the HGI is used in development, design and construction of grinding circuits The HGI value serves also to more detailed specification of coal in the international trade InaccuraciesTo determine the relative grindability of coal, ie whether it is easy or difficult to pulverize, the Hardgrove test is a standard method widely used (Klima, 1999) The Hardgrove grindability index (HGI) can be then estimated from the test The higher the index is the easier the coal to be pulverizedCharacteristics of Mae Moh lignite: HardgroveI 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 processHardgrove Grindability Index (HGI) Vs Anthracite Quality

  • Standard Test Method for Hardgrove Grindability Index

    11 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 D409Sections of this test method contain the significance and use of the HGI of petroleum coke, preliminary sample preparation procedures, and procedure andCoal is generally analysed to determine its physical, chemical, thermal, mechanical properties like size consist, proximate values, ultimate values, calorific value and HGI Calorific Value (CV) is an important thermal property of coal which indicates the amount of heat energy that could be liberated on combustion of a specific quantityCalorific Value of Coal