| Pages:
1
..
8
9
10 |
axehandle
Free Radical
Posts: 1065
Registered: 30-12-2003
Location: Sweden
Member Is Offline
Mood: horny
|
|
I'm going to use standard casting sand. The grains are quite big, so the whole mass is very porous.
Btw: I've cast before. But thanks for your concern.
My PGP key, Fingerprint 5D96 E09E 365D 1867 2DF5 C2FE 4269 9C19 E079 CD35
\"Verbing nouns weirds the language!\"
|
|
|
maxke
Harmless
Posts: 7
Registered: 18-5-2004
Member Is Offline
Mood: No Mood
|
|
Axehandle,
Have you visited the following page ?
http://www.backyardmetalcasting.com/
There are sections about propane burners and building a refractory. The info inside is compact but might be of use.
The best of luck and mad respect for your work here, and your achievements in general. (your homepage has a large drool factor btw)
|
|
|
axehandle
Free Radical
Posts: 1065
Registered: 30-12-2003
Location: Sweden
Member Is Offline
Mood: horny
|
|
Many times. But thanks anyway.
My PGP key, Fingerprint 5D96 E09E 365D 1867 2DF5 C2FE 4269 9C19 E079 CD35
\"Verbing nouns weirds the language!\"
|
|
|
Ramiel
Vicious like a ferret
Posts: 484
Registered: 19-8-2002
Location: Room at the Back, Australia
Member Is Offline
Mood: Semi-demented
|
|
Document! Document! Document!
um... yea.
-Ramiel
Caveat Orator
|
|
|
axehandle
Free Radical
Posts: 1065
Registered: 30-12-2003
Location: Sweden
Member Is Offline
Mood: horny
|
|
Back in business!
My newly built electrical melting furnace seems to work: http://www.sciencemadness.org/talk/viewthread.php?tid=1968
... so now I can soon begin casting aluminum again!!!!
My PGP key, Fingerprint 5D96 E09E 365D 1867 2DF5 C2FE 4269 9C19 E079 CD35
\"Verbing nouns weirds the language!\"
|
|
|
axehandle
Free Radical
Posts: 1065
Registered: 30-12-2003
Location: Sweden
Member Is Offline
Mood: horny
|
|
Now I only need to build a cylindrical crucible and clean up my workshop^H^H^H^H^H^H^H^Hkitchen... then the work will FINALLY continue. I have some
pretty amazing designs in my head to put down on paper.
The only thing that's still in a "floating" stage is the sulfur burner... I have many dirrerent ideas there, most of which would
probably not work.
My most recent idea reminds of a hot glue gun. Pre-cast rods of sulfur are pressed against a hot Al plate with a small hole in it. Sulfur is turned
into gas at the plate, the gas is then ignited piezoelectrically. This could go wrong in so may ways, though...
Another idea would be to let molten sulfur drip into a ceramic chamber, the part of the bottom where the droplets land is a constant red-heat by
heating coil embedded in it. This could probably be adjusted to remove the need for a gas-stream preheater (before the catalyst chamber). The obvious
problem here is coupling ceramics to aluminum tubing... the heat expansion properties are very dissimilar. This one is still my favorite though, since
it's very simple to build, now that I can fire ceramics...
My PGP key, Fingerprint 5D96 E09E 365D 1867 2DF5 C2FE 4269 9C19 E079 CD35
\"Verbing nouns weirds the language!\"
|
|
|
axehandle
Free Radical
Posts: 1065
Registered: 30-12-2003
Location: Sweden
Member Is Offline
Mood: horny
|
|
Sulfur burner...
I think I have solved the problem of designing a good small-scale sulfur burner! Drawings will follow...
Edit1: ..if I can get this fscking scanner to work, that is... Ah, mentionable is that the burner must be places in an airtight vessel (I'm
thinking glass here, it will look pretty) with air pumped in, and a pipe leading the SO2 + air mix towards a muffle heater that will bring the gas up
to 500 degrees C, after which it will pass through a catalyst pipe and then to an SO3 absorption flask... let's see if we can get this scanner to
work now..
Edit2: Here we go. The "heater" will probably be a small heating plate made of resistance wire embedded in phosphate bonded cement:
[Edited on 2004-8-11 by axehandle]
[Edited on 2004-8-11 by axehandle]
My PGP key, Fingerprint 5D96 E09E 365D 1867 2DF5 C2FE 4269 9C19 E079 CD35
\"Verbing nouns weirds the language!\"
|
|
|
Eclectic
National Hazard
Posts: 899
Registered: 14-11-2004
Member Is Offline
Mood: Obsessive
|
|
Hey Axehandle
Ok, I found the correct thread for this.
Here is a recipe:
4.5 kg V2O5
13.3 kg KOH
42.8 Kg kieselguhr (diatomaceous earth, pool filter)
14.3 ground spent catalyst residue
6.4 kg sulfur
2 kg ammonia
32.5 kg 16 Be H2SO4
Then I went to some patents and found out about more recent optimized catalysts using Cs instead of K.
I can try to find smaller batch recipes from US patents if you are interested. The optimum temp seems to be aboyt 450 C. Reaction is exothermic, and
higher heats increase reaction speed but push the equilibrium the wrong way.
|
|
|
Eclectic
National Hazard
Posts: 899
Registered: 14-11-2004
Member Is Offline
Mood: Obsessive
|
|
So why do you think sulfur will not react with aluminum to make aluminum sulfide?
Can you get stainless steel tubing from a plumbing supply? It should be fairly inert to SO2 adn SO3.
In all the discusion about thermostats, here is one I didn't see: Your heating element has a positive temperature coefficient, so it you can
measure the current and voltage across the heating element, you can figgure the resistance. Translating that to an actual temp reading might be
tricky, but if you get a circuit to hold the element resistance constant, your temp will be constant also.
|
|
|
Eclectic
National Hazard
Posts: 899
Registered: 14-11-2004
Member Is Offline
Mood: Obsessive
|
|
A good source of fairly cheap and pure scrap aluminum is aluminum electrical cable. About 99.5% pure with a little silicon and magnesium.
|
|
|
Eclectic
National Hazard
Posts: 899
Registered: 14-11-2004
Member Is Offline
Mood: Obsessive
|
|
Danger! Danger!
You should test molten sulfur in hot aluminum in a thermite safe location before scaling up. Al/S powder is used as an ignitor for thermite! See
thermite threads. Stainless steel would be MUCH safer.
|
|
|
tetrahedron
Hazard to Others
Posts: 210
Registered: 28-9-2012
Member Is Offline
Mood: No Mood
|
|
V2O5 catalyst
in new zealand they also add potassium sulfate:
http://nzic.org.nz/ChemProcesses/production/1B.pdf
(comes with temperature control graph)
|
|
|
Arsole
Hazard to Self
Posts: 52
Registered: 21-1-2012
Location: USA
Member Is Offline
Mood: Sleepy
|
|
8 years too late man.
Anyone still working on the contact process?
Thoughts, like fleas, jump from man to man, but they don't bite everybody.
-Stanisław Jerzy Lec
|
|
|
plante1999
International Hazard
Posts: 1936
Registered: 27-12-2010
Member Is Offline
Mood: Mad as a hatter
|
|
I did, you can look in lab scaleindustrial processes volume two.
I used platinum instead of vanadium however, and I got good result.
I never asked for this.
|
|
|
Texium
|
Thread Moved
20-11-2023 at 12:47 |
| Pages:
1
..
8
9
10 |
![[*]](images/xpblue/default_icon.gif){kind=icon}
