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d. Abrasion Index mg/kg 60 to 125 e. Hard Groove Index 45 to 110 EFFECTS OF COAL ELEMENT ON MILL CHOICE AND SIZING. MOISTURE - More hot air is required to dry the coal particles . VOLATILE MATTERS- Determine temperature of Mill outlet and furnace.
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The maximum possible grinding capacity depends on the coal character (grain composition, grindability index, rock concentration, moisture content etc.), on the dust system characteristics (drying, ventilation and grindability) and on the amount of coal fed into the mill, on the coal feeding system and its regime (Formusatin, 2008).
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The Hardgrove Grindability Index was developed in the 1930s from experimental work by R. Hardgrove to determine the relative difficulty of …
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CALCULATIONS The hard groove grind ability index of coal is than calculated using the following formula. HGI = 13 + 6.93 w Where, w = weight of the test sample passing through 75μ sieve and retained on 300 μ sieve after grinding in the HGI machine. 10. FACTORS AFFECTING THE GRINDABILITY VALUES 1.
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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 in their mills, allowing them to estimate grinding power requirements and throughput capacities. SGS is a world leader in coal and coke ...
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Bond Grindability Test Procedure
Bond Grindability Test Procedure. The Bond Ball Mill Grindability test is designed to give a measure of the grinding characteristics of a material by finding the amount of size reduction resulting from a controlled energy input. Ball Mill Grindability of a material depends upon its hardness, structure, the manner in which it is fractured.
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Hardgrove Grindability Index - Wikipedia, the free encyclopedia 50 g of air dried coal featuring a grain size in the range between 0.6 and 1.2 mm are filled into the sample mill and a weight is put on the mill's grinding stone.
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Hardgrove Grindability Index. 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.
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