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Oil fired crucible furnace

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vtsteam:
The firebricks actually had a vitrified surface buildup, rather than erosion. The white flecked area is the additional material, and the outer black shiny area is a glaze.

vtsteam:
I saved both the firebricks and the sand clay material to serve as a backing to the new mineral wool furnace insulation I will be adding. Here used firebricks have been used to build up the bottom of the furnace.

vtsteam:
Then some of the sifted crumbly sand and clay mortar has been used as infill.

vtsteam:
I sifted the rest of the old mortar and added a bucket of sand, and a bucket of fireclay. Mixed it up in a wheelbarrow with a hoe, gradually adding water until it was a nice stiff rammable mix.

Next, I took a quart of the mix and added more water to make a mud. This was smeared lightly all over the inside of the furnace shell to wet it and make the stiffer mortar stick better to the metal.

Then I pressed handfulls of the stiffer mortar/refractory into the furnace by hand, then pounding it into place with a piece of brick to get it to pack in place really well. I had just enough to apply an inch thick coating throughout the furnace shell by evening. I covered it over to finish tomorrow. Next will be molding into the bottom an Ironman style plinth, and then firing the shell to dry it out and prepare it for adding the mineral blanket insulation.

Here's what it looked like at the end of the day:

vtsteam:
Plinth added:

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