Paddywhacker
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DIY propane furnace
Hackaday recently posted a video on constructing and using a forge which might be useful in the chemistry field. Read the comments for more
information, for example about refractory cement.
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ElectroWin
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while very nice, the method in the video makes a rather small sized forge; i suggest upsizing this, eg: use a pair of gallon paint cans, stacked;
these have a 7" diameter, so together will make somewhat over a foot long; and use thicker, lighter-weight insulation consisting of the above plaster
plus expanded perlite. make it 1.5 to 2" thick.
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Pyro
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How much gas do you think something like that uses? I once made a charcoal forge, it was a metal trash can lined with some type of refractory clay
mixed with a little straw. It had a hole in the bottom with a tube leading to a hair drier. you start a fire in the bottom with wood and then add
charcoal and start blowing in the air. then a bit under the rim was another hole to insert metal to heat. but I dropped it and broke the lining 
I think both gas and coal have their advantages, lighting the charcoal was a bitch. if you were to make something with gas to light the charcoal?
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Blue Matter
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Think you might find this interesting pyro http://www.backyardmetalcasting.com/bestfuel.html
Also I made a furnace out of some fire brick and a torch used to melt ice off of a airport runway I ran it multiple hours a day and it lasted
probabley 2 weeks or so.
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Pyro
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That's a very interesting comparison. they should factor in one more thing: Coke (not methyl (1R,2R,3S,5S)-3-
(benzoyloxy)-8-methyl-8-azabicyclo[3.2.1] octane-2-carboxylate or that brown stuff from a bottle that you drink but roasted coal) it's almost pure
carbon, burns hotter and leaves no ashes, Oh did I mention that its free? you can steal it at any big harbour. jeez, I should build another furnace
and go steal a trainer full on a sunday  it burns as high as 2000*C
I also have an obsession with O2, I love trying to get higher temperatures with it I tried rigging my bunsen burner with it, didn't work though
I am on holiday now and am bored, Ill try to throw something together with ''clay'' from the corn field at the end of the garden (It's 25m from the
back of the house, i'll tell you theres nothing like watching children of the corn and then going for a stroll in the corn )
Ill see what I can do and post pics tomorrow.
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testimento
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Coke is made from anthracite by roasting it. Produces high temps etc. Very good, I used.
I have a furnace that is almost ready, but I havent kept hurry with it because I dont need it right now. But the strucure is as described in picture I
attach to this message.
The base is fireclay moulded, and the sides are just firebricks set over there and the top is two firebricks that fit between the walls. The
dimensions inside are about 250x250mm, and the total height about 350mm. There are 4 air holes total, with one larger for burner, I made a square
steel pipe and line fan with 500m3/h air blow, when I put coal inside the oven, it will burn VERY hot, at least up to 1500C. I'll post some pics for
you when I fix it complete.
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Oscilllator
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Quote: Originally posted by Pyro  | That's a very interesting comparison. they should factor in one more thing: Coke (not methyl (1R,2R,3S,5S)-3-
(benzoyloxy)-8-methyl-8-azabicyclo[3.2.1] octane-2-carboxylate or that brown stuff from a bottle that you drink but roasted coal) it's almost pure
carbon, burns hotter and leaves no ashes, Oh did I mention that its free? you can steal it at any big harbour. jeez, I should build another furnace
and go steal a trainer full on a sunday it burns as high as 2000*C
I also have an obsession with O2, I love trying to get higher temperatures with it I tried rigging my bunsen burner with it, didn't work though
I am on holiday now and am bored, Ill try to throw something together with ''clay'' from the corn field at the end of the garden (It's 25m from the
back of the house, i'll tell you theres nothing like watching children of the corn and then going for a stroll in the corn )
Ill see what I can do and post pics tomorrow. |
I have a forge that runs on coke and I can tell you it does leave ashes. The coke gets up to high enough temperatures to melt steel, and I have
previously cast ~150ml of copper from a crucible using it. Wonderful device, however my current forge does not have a way of removing the ash, so it
gets a little clogged after a while .
In another experiment I attempted to make KNO2 from the decomposition of KNO3 in a copper pipe. This was unsuccessful, as the KNO3 bubbled so
vigorously that it all sprayed out of the pipe. I did have some success with using an ordinary steel can, however to do it properly I need a nice
ceramic/metal crucible. Does anyone know of a decent metal pot that could be used as a crucible?
Also, here's a picture of the forge: (the white stuff is zinc oxide).
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