How long would it take to burn 1lb of ti
How long would it take to burn 1lb of ti
(OP)
Hello all,
I am estimating the time it will take to burn 1lb of commercially pure ti powder in oxygen (outside atmosphere)? Thanks
I am estimating the time it will take to burn 1lb of commercially pure ti powder in oxygen (outside atmosphere)? Thanks





RE: How long would it take to burn 1lb of ti
RE: How long would it take to burn 1lb of ti
RE: How long would it take to burn 1lb of ti
Fair enough.
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RE: How long would it take to burn 1lb of ti
If you think education is expensive, try Ignorance.
- Andy McIntyre
_____________________________________
RE: How long would it take to burn 1lb of ti
Forgot to include this publication from Special Metals that goes with my response to the OP;
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You can perform the calculation based on density and combustion rate.
RE: How long would it take to burn 1lb of ti
If you think education is expensive, try Ignorance.
- Andy McIntyre
_____________________________________
RE: How long would it take to burn 1lb of ti
Yes, particle size plays a significant role and the two documents from Special Metals above highlight this fact and provide very specific test requirements for determination of combustion rate using a standard practice.
RE: How long would it take to burn 1lb of ti
Just for giggles, say your 1 lb of powder was spread out over 1 ft^2 area, which would make a layer about 1.5 mm thick. Since that works out to be about 0.5 gm/cm^2, it should take about 1 second.
TTFN
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RE: How long would it take to burn 1lb of ti
RE: How long would it take to burn 1lb of ti
I'm actually calculating after the experiment took place, so I didnt perform the experiment and do not have any of the powder. The only information I have is, "1lb. of commercially pure ti powder was mound up (cone shape) onto a Sn lid (from a drum) outside in a field and was ignited with a blow torch". I also have one picture of the set-up before the experiment. The reason I am calculating this is to determine if the result they got (~3 minutes) was correct. I am suspecting maybe the titanium oxidized and only the surface of this cone shaped mound was actually ignited. So here I am to experiment since I have no other information.
I found the density of ti to be 4.5g/cm^2. Now with powder, I assume it is ~50% dense and, therefore, the ti powder would have a density of 2.25g/cm^2?
I calculated the volume of the cone to be =~226.2. assuming the radius=~6cm height=~6cm (approximated from the picture taken before the experiment).
If my assumption is correct, I would guess only 1mm of the surface of the cone ignited so I end up with 160cm^2. I get ~5min. for this amount to burn. So I figure something did not go well since they got 3min.
I also figure the experiment did not go well because titanium's melting point is ~1668 °C and Sn is ~232°C, so titanium should melt right through the Sn lid, which it did not. Thanks again for the help so far
RE: How long would it take to burn 1lb of ti
What if your question were "how long does it take to burn one pound of gasoline"?
RE: How long would it take to burn 1lb of ti
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RE: How long would it take to burn 1lb of ti
And yes, I believe the particle size would definetly affect the rate, as would the air velocity, density, how intensly the torch was used to ignite the powder and maybe even where on the 'cone shaped mound' it was ignited..ect, all which I do not know.
All I would like to accomplish is a ball park figure given what I have. So unless these factors could affect the result to range from lets say ~3 min to ~75min then I guess I couldnt even come up with a resonable range to rule out the ~3min result they obtained. And I guess your telling me that?
Maybe this question is just too difficult, I wish I had some powder laying around :/
RE: How long would it take to burn 1lb of ti
TTFN
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RE: How long would it take to burn 1lb of ti
RE: How long would it take to burn 1lb of ti
If you blew the powder into a cloud and provided proper ignition the time would be more like 0.1 sec. You could blow a building up this way.
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RE: How long would it take to burn 1lb of ti
Though not directly involved we had 3 explosions while working with powdered Ti while doing pilot plant work on using Ti to photocatalytically decompose NOx. I don't have the pilot plant data on the physical parameters but do know that the powder was the finest that was available at the time. There was an extremely powerful UV lamp and air involved. The first explosion was relatively mild, only destroyed the reactor, a small horizontal kiln. The second was the big one that took out the small reactor building. I assume the third one was just to prove it would blow up.
We had another incident with Ti where a solid 3" x 5/16" thick disk was just starting to be heated in a vacuum when O2 enriched air was accidently introduced into the chamber. This explosion essentially took out the whole room along with a 8" thick brick tile wall.
I learned long ago that fine metal powders have no place in conditions where heat and air are involved except under carefully controlled condition. This holds true when involving fine powders in reactions.
Anecdotal:
Pilot plant operators were running the PP when the first explosion happened, evidently two PHD's had taken over when the second explosion happened. The operators in the PP said 10 minutes after the explosion the PHD's were wearing coveralls.
RE: How long would it take to burn 1lb of ti
RE: How long would it take to burn 1lb of ti
RE: How long would it take to burn 1lb of ti
TTFN
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RE: How long would it take to burn 1lb of ti