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Post by Robert on Feb 13, 2014 3:52:35 GMT -8
Hey All.
Have you heard about Magnesium bricks... I have been speaking with Radek that he used them recently to build one bell stove... They use thos bricks in electrical heaters... They say that the accumulative characteristics is much bigger than fire bricks... they can be heated up to 700C... so seems like they are perfect to use to build teh stove...
but... as i was asking few technicians they told me that they are not suitable for the enviroment of our stoves... they do not like acid and water vapour at all... do you know something about that?
thanx for comments.
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Feb 13, 2014 4:24:31 GMT -8
I dry stacked some of these in my bell to add mass and increase the ISA. I'll examine them when I take it apart.
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Post by Vortex on Feb 14, 2014 2:23:06 GMT -8
I have a stack of them outside that a friend gave me last year, they've been out in all weathers and are still perfect so they dont mind water. They are amazingly dense, look like they're made of iron slag, didn't know it was magnesium.
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Post by Robert on Feb 14, 2014 4:04:13 GMT -8
There are two kinds of those bricks... Magnesium bricks and MAGNETITE... The first one don`t like water especially in the enviroment of the stove... the other are good for that... So maybe Vortex, you have Magnetite... especially if you say that they look like iron.
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Post by talltuk on Feb 14, 2014 12:16:29 GMT -8
I am building a stock pile of them. We call them storage heaters here.I think mine must be magnetite. I feel they are perfect for easier building of benches combined with a little cob and half barrels. I have had some sitting out in all weathers and they seem ok after lots and lots of rain. Not planning to use in flue path but might be ok.
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Post by Vortex on Feb 14, 2014 13:47:45 GMT -8
Mine definitely look the same colour as the pictures of Magnetite bricks online.
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Post by Robert on Feb 14, 2014 14:20:54 GMT -8
you lucky rocket bastards  those are really good bricks... you can build the bell out of them... first skin, ans second with red bricks... and you will have a heat beast... of course if you need it:) depends on you winters... oh i am jelaous... they are hard to get in Poland ;( |
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attis
New Member
Posts: 2 
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Post by attis on Feb 23, 2014 8:07:10 GMT -8
Hi All,
This is my first post here nevertheless I read it every day as I'm planning to build an 8" J tube soon. This forum is amazing, full of useful information and helpful folks.
Back to the topic, as far as I know magnesium bricks are used in electrical heaters as magnesium bricks cannot really resist direct flame.
cheers,
Attila
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morticcio
Full Member
"The problem with internet quotes is that you can't always depend on their accuracy" - Aristotle
Posts: 371
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Post by morticcio on Feb 23, 2014 11:06:11 GMT -8
Mine are like these here
The manufacturer's site describe them as high density bonded magnetite bricks.
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Post by Vortex on Feb 24, 2014 1:45:52 GMT -8
That's the exact same ones I have!
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Post by talltuk on Feb 25, 2014 14:36:54 GMT -8
Yup and me. Got some flat uns as well. Got a healthy suppy built up and gonna use some on my first experimental bench in the cob
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Post by sparks on Feb 26, 2014 19:35:08 GMT -8
Not certain if what you are talking about are the same bricks that are used in Steibel-Eltron Electric heaters. The ones in those heaters hold heat really well and have been very popular around my neck of the cold northern tundra... LOL.
If these bricks are the same they make really great thermal mass. It would seem interesting to know if they can be used for the same purposes with the rocket heaters. I would imagine they should be wrapped around the exhaust tubing so they don't get TOO hot. (Not near the heater combustion chamber or heat riser.)
I have two of these heaters in my house and since my latest adventure, haven't been using them. Maybe I should re-visit those bricks. Someone out this way called them "Italian bricks" so I never looked into it any further...guess I will now!
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Post by talltuk on Feb 27, 2014 13:34:39 GMT -8
Hi sparks. Sounds similar. These bricks weigh a lot! Each one must be around 7-10kg. Personally I am going to use them in my benches to lower the amount of cob/clay I need. The ones I have store a ton of heat, even from just being in the sun. I wouldn't use them as hot face in the flue run. I made a couple of cores out of them and they got a bit crumbly.
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Post by sparks on Mar 2, 2014 20:40:12 GMT -8
I guess for now I will leave them alone. They are still inside those heaters and I imagine that if I find a need to use them, I will. For now, I am VERY interested in pursuing the cast core as noted in the video above. I didn't see anything about the heat riser in that video but I really like the simplicity of the design and the ease of construction.
Thank you all for your help and guidance on this adventure. I burned my big heater again the other day and still have not had any significant deterioration. I do notice that it is still trying to overcome below Zero temperatures in my "neck of the woods" so I wonder if that has any influence on the issue of deterioration?
I really am glad I came here to discuss this. I think I will be changing my approach to building my rocket heaters from here on out.
AGain, thank you so much for all the help!
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Post by sparks on Mar 4, 2014 7:35:32 GMT -8
OK now I am going to go out on a limb here and question the current paradigm...cob. Has anyone done any experimentation with ANY other substance to act as a heat battery besides cob? The reason I ask is that the weight of a large thermal mass such as cob is absolutely PROHIBITIVE in a vast number of homes. Not everyone lives on a cement slab that can tolerate a 7000 lb. mass of cob, and for that matter, most of us are NOT Masters Degree level sculptors with the ability to form cob into some kind of artsy looking frog face or whatever so that "OTHER MEMBERS" of the household will tolerate the "aesthetics" (if you get my meaning)
I get the need for the change in design to the casting with refractory brick sand and insulation material. That is a "no-brainer" for me. I can follow those plans (and would like to see a video on the heat riser section of the stove, as well). The construction of the basic RMH is established using things found "here and there" such as 50 gallon drums, etc. It occurs to me now that such a design is somewhat limited in that it is great for one room but how many of us live in only one room? How many of us live where we can build a 7000 lb mass of cob and have it not fall through the floor into the apartment below (just for an example).
If we truly want such an item to help change our energy use in this country, we are going to have to "think outside the current box" and figure out a way to include folks who are NOT off the grid, NOT out of the suburbs or city for that matter and NOT able to design their own infrastructure.
I keep thinking about how we can heat more than one room with this thing. It is currently the way of the architect to design many rooms in our dwellings and how we keep warm is important. Obviously we need to change how we design a home so there are rooms that while maybe important for storing certain things or use in "warm weather" are NOT necessary to be heated so we can concentrate on our survival when we have a winter like this one where the temperature has averaged BELOW ZERO for the entire time from early November till now and on into the foreseeable future (Spring calendar or no).
The Rocket Stove is in my opinion, a tried and proven technology. It is simple, can be built by nearly anyone with half a brain and can be used efficiently for the betterment of mankind. Winiarski is one of the "hero's" of our time, but don't expect to see him or Geoff Lawton on the cover of Time Magazine any time soon.
Now that we have the rocket stove design, we need to move ahead with ways to incorporate this basic design into our overall infrastructure in order to include more folks who need heat.
OK, I'll get down off the box now....
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