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S. KHOSHJAVAN¹, M. MAZLUMI², B. REZAI¹ and M. REZAI²348 Кб. Coal grindability, usually measured by the Hardgrove Grindability Index ( HGI), is of great interest since it is an important practical and economic property for the coal handling and utilization, particularly for pulverized-coal-fired boilers.

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Grindability is an important factor for the characteristic of the brittle raw materials by the design the mills. As grindability depends on many unknown factors, hardgrove grindability index (HGI) is determined empirically using a sample mill, according to the following procedure.

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As it is convenient to express, understand and compare physical properties in terms of numbers known as indices, grindability is also similarly expressed by grindability index popularly known as Hardgrove Grindability Index (HGI). Routine determination of HGI requires …

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HGI with moisture content and ash content of coal was observed while the relation with volatile matter and *Author for correspondence; E-mail: [email protected] fixed carbon was negative. Abstract. This stone deals with the determination of stone properties and hardgrove grindability index

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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 ...

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However, several problems can arise during mill dimensioning. Some of them originate from the determination of the grindability. Three different grindability indices – the Bond work index (BWI), the Hardgrove Grindability Index (HGI) and the Zeisel specific grindability (Wt) are used for the characterisation of grindability nowadays.

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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.

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Many expressions of grindability have been proposed over the years, but two of these have come into prominence because they have become the recognised basis for design of certain types of mill. One of them is the Hardgrove index, associated mainly with vertical spindle mills and the other is Bonds grindability. associated with tumbling mills

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Hargrove Grindability Index (HGI) A measure of the relative hardness of the coke in terms of resistance to grinding. An HGI below 35 usually means a very hard coke requiring considerable grinding before it can be properly sized to meet burner nozzle specifications for the pulverized feed to the furnace where the coke will be burned.

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