How to build a melting furnace

Written by steve smith
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A melting furnace can be used to melt down metals like brass, copper and aluminium. These are very useful if you like to make your own cast metal items. It saves money, and can even make you money, if you are selling these metal items. You could actually melt down metal from parts, siding and cans you find right in the trash. It is also something you can build in your home.

Skill level:
Moderately Challenging

Things you need

  • Fire bricks
  • Gas burners
  • Sheet metal
  • Clay or ganister

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  1. 1

    Purchase several high temperature fire bricks, enough to build a hearth that will surround your furnace.

  2. 2

    Lay down a single layer foundation of fire bricks, then stack the remaining bricks on top of this foundation. Leave enough space for your gas burners to fit in the centre of the bricks. Stack your bricks about two feet high and leave enough room to access the melting pot which you will install later.

  3. 3

    Drill a hole in the side of this fire brick hearth large enough to fit the pipe for the gas burners. Then place the gas burner inside of the hearth, and thread the pipe through the hole.

  4. 4

    Drill two holes into the side of the heart directly across from each other, and slide a 1/2-inch to 1-inch wide iron pipe through this hole. Make the holes an appropriate distance from the gas burners, about a foot above them.

  5. 5

    Hang your iron pot on this iron rod. Then cap the furnace using firebricks. Stack them on top of furnace walls.

  6. 6

    Install your venting fan near the opening of the furnace, or drill a hole through the fire bricks to vent the furnace.

Tips and warnings

  • If you are running a large, commercial melting furnace, then town or city permits are required and you will need to comply with waste and emissions laws as well as zoning laws. For a home melting furnace, permits are not typically required. You should contact your town office, or city offices and ask just to make sure. In addition, a large furnace may not comply with some firecodes.

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