Density/Specific Volume of Anthracite Grades

Anybody have a reliable source to convert volume to weight for the various grades of anthracite?

(I have rice but I presume that the data will cover the range of sizes.)

Thanks. -- Jon

Hello Jon if I understand correctly You looking to find out what Anthracite weights Per lb by cubic ft.
That would depend on a few things For instance it will depend on what vein the coal came out of
In the mid to southern Athracite Fields where I buy coal it can be 51lbs per cubic ft. to 53lbs per cubic ft. Now if you go up north a little say 12 to 15 miles it can be 53lbs per cubic ft to 56lbs per cubic ft.

All of the breakers will know what it's weight is Per lbs Per cubic plus the Ash % content will also
change from vein to vein or even in the same vein For instance the one Place I buy from will be
53lbs Per cubic ft. with a ash content between 8% to 12% The other Place will be about 12 miles
north of the first one and that coal will be 53lbs to 56lbs Per cubic ft. with a ash content of 5% to 6%

Now that is in the same vein of coal the first place as 4 to 5 mines so you have a few veins of coal
coming in so thats why the weight and the ash content will be different you may even go farther
north and it will be more lbs Per cubic ft. and have more or the same Ash content most will be more
Hope this helps you out If you need more info PM me Or call me I can give you info and numbers Take
care and talk to you later

Thanks, J.C.

But doesn't it matter how finely it's broken? In other words, wouldn't stove coal weigh fewer lbs per cubic foot than rice, because the rice doesn't have as much air between the pieces?

Maybe the difference between grades is less than the difference between mines but I'm curious to find out how the grading affects density relative to whatever grade is the baseline for the density coming from a given vein, or mine.

Thanks again.

The opposite of true, rice weighs less per cubic foot or requires more space per ton. My only guess is the stove will produce larger pockets of air but because the smaller sizes have so much more surface area they craate a larger volume of air. Now if you put it into a box and vibrated it you might get the same volume or even less, you would be suprised how volume is "lost" on very long trips especially if its a rough road. And no it's not falling off the truck...

Just as an example in this picture I have 5 ton of buck on the truck. If that was nut it would be barely be above the edges. If it was stove it would be barely visible and you wouldn't even know I had anything on it if you were ground level:

So do I take it correctly that settling is a much more significant factor for the smaller grades?

Yea if you're driving it 50 miles over bumpy roads, it's not going to settle just sitting there. Of course once you put it in the basement that's no longer an issue. I only mentioned that because if you drive aload a ver long way such as some of the customers I had which were generally on bumpy roads the coal could settle quite bit, particularly in the back where it's going up and down the most.

My limited experience with 3.7 tons of pea coal in my trailer was that the coal moved forward. What I had leveled at the breaker was no longer level. The coal was higher at the front of the trailer. Travel was primarily on interstate quality roads except for the few miles from the breaker to I81. The load had a secure tarp over it.

Yanche wrote: The load had a secure tarp over it.

You can get up to about 50mph and rice won't fly off and even then it only would come off on that truck cause of the way the air went up over the cab. I carried a tarp for interstate travel but other than that never used it.

Well I tell you this with a dump truck you better use a tarp this past saturday morning I had Are member MT come down from woodbridge connecticut I took him to the breaker to buy coal he
also had a trailer after getting 12.480.00 of coal we tarp the trailer and did not tarp the chevy 3500
dump truck with the rice in it well all I can say is we had to pull over and put a tarp on it a few miles down the road because the coal was flying out the back and hitting the cars behind him And his speed was nowhere near 50 M P H more like 25 to 35 M P H Now where it was coming out of was in the front of the bed about a 2 foot hole was right in front of the steel frame veiw window on the dump box the Air was coming in there and lifting and blowing the coal out the back there was no issue with the tarp covered trailer so I would say cover your loads and save money because if one of those driver in the back of you decides to use there cell phone and call 911 you can bet you will be paying a big fine for not having you load coverd

Never had a problem below 50 with that truck, the piece sticking up on the back stops it I can assume. If you get over 50 the wid comes up over the canpony and hits it on the sides. You have to consider it's pretty flat so there isn't a lot of turbulence. Whatever the case I alwys had tarp for long distance highway travel, no way to avoid that unless it was nut or pea. I think it's pretty safe to assume that it didn't fly off the back considering the amount of cops that have been behind me in the 15 years I drove around in that truck.

I don't know if this is of any help but look at this website link
http://www.reade.com/Particle_Briefings/spec_gra2.html
Look under "C" for coal,anthracite

Here's what the reference table lists:

Coal, Anthracite, solid
specific gravity = 1.51
lbs/cu. ft. = 94

Coal, Anthracite, broken
specific gravity = 1.11
lbs/cu. ft. = 69

I'm confused, how can the specific gravity change depending on the size of the coal, solid or broken? Specific gravity is mass divided by volume, i.e. it's independent of sample size. What am I missing?

I seen that to Yanche like I said on my reply it will be different depending where it comes from not all coal
weighs the same in cubic ft for instants the coal that you have is 51lbs to 53lbs per cubic ft the other Place up north is 53lbs to 56lbs per cubic ft I have that chart in my bookmarks I am with it unless They are using stripping coal in that chart because you know shale and rocks weighs more

Perhaps they took industry figures according to the separation process, it's not water but water with magnetite in it which would lower the specific gravity of the coal relative to the water/magentite mixture. With the right amount of magentitie the coal floats and the rock sinks. Assuming a specific gravity of 1 is relative to water that would be about right, I don't know exactly what they shoot for but they do need the right amount of magnetitie in the water. Too little and lot of coal starts going out the refuse chute, too much and a lot of rock starts coming out.

Yes coalman that is how the do it The 3 wet breakers That I go to use that process The Weights That I posted are what they told me after They Process The coal I do not know if all breakers do the same Or is that Standard practice I also go to one dry breaker aswell but I never asked them if use the same Process I just ask for B.T.U.'s Per lb and ash content also lb per cubic ft. There numbers are higher in cubic weight