How to make a mini biochar kiln
There are many ways to make biochar. I like this small and slow solution because it makes great use of "waste" materials, as well as the heat that is generated by our fireplace. How to make a small kiln to fit your woodstove Get two cans, the same diameter. I like to use homebrew cans so I can fit in large sticks. Crimp the end of one can so it slots into the other. There needs to be small air gaps to relieve pressure as gases are released. If the fit is really tight you can knock a few holes in the end with a hammer and nail. You're aiming for an almost -airtight container, so be creative. I've used an old stainless steel pot with a lid before. Fill the cans with dried organic material – prunings, nut shells, bones, citrus peels, apricot seeds, even gum nuts; pretty much anything organic (and dry). Get your fire going well. Best to have some red hot coals in there and some nice flames with medium sized bits of wood. Lay the cans over the fire and watch. With a hot f...