metalresearcher
National Hazard
Posts: 822
Registered: 7-9-2010
Member Is Offline
Mood: Reactive
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How to make lime or magnesia bricks for an electric arc furnace ?
In the past I have experimented with an EAF using a DC welder and carbon rods. I can melt steel in limited quantities (max 100g) in a few minutes, but
the biggest issue is a suitable crucible. Now I have a lanthanated tungsten rod (for a TIG torch) which I attach to the cathode and a steel anode
embedded in refratcory mortat.
However, I have read some chapters of Henry Moissan's book on his EAF (much larger than a DC welder) and he used CaO bricks. Should be interesting as
these withstand the intense heat of 2000+ºC much better than refractory mortar rated for 1600ºC.
But how can I make these bricks myself ? AFAIK, they are not commercially available. I can only buy lime powder at the local hardware shop. Did anyone
make CaO or MgO bricks ?
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Admagistr
Hazard to Others
Posts: 395
Registered: 4-11-2021
Location: Central Europe
Member Is Offline
Mood: The dreaming alchemist
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Hi metalresearcher ! You can buy high-density magnesite bricks, which are heavy,
pressed under high pressure, made from MgCO3, and then fired to MgO. I have two pieces so far, but I need to buy more. They are sold in our store,
which specializes in fireplace construction.
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