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Anonymous Poster

# Coal

02/22/2008 3:28 AM

sir ,

what is the density of coal ?

coal size: +10mm=15.4 %

-10 to +6mm=14.6%

-6 to 1 mm=42.8%

-1mm=27.2%

the above figures are taken from 100% coal sample

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#1

### Re: coal

02/22/2008 4:36 AM

B) Rather than doing lots of complicated sums, giving an estimate which may or may not be anywhere near the correct answer (the shape of the fragments, for instance, will affect the packing density), why not take a known volume, and weigh it?

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#2

### Re: coal

02/22/2008 8:09 AM

You could look in some reference books.

Screw conveyor catalogs used to have this information in them.

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#3

### Re: Coal

02/22/2008 11:40 AM

Wilkesbarre anthracite lump weighs 69.4 lb per cu. ft.

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#4

### Re: Coal

02/23/2008 3:06 PM

It is simple. You take a big enough lump of coal. You fill a pot exactly full with water. Lower the coal gently into it. Catch the water displaced = exact volume. Weigh the coal = exact weight. Divide = exact specific weight.

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#5

### Re: Coal

02/23/2008 3:56 PM

But unless our Guest was wasting his time telling us about the distribution of particle sizes, he wants to know the average density of his aggregate of assorted bit of coal.

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#6

### Re: Coal

02/25/2008 11:53 AM

Refer to Kempe's Engineers' Year Book 1988, part 1, section F2. Pages and pages of tabulated information!

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