I know you you can desolve NM black sand with nitric. I have never messed with acids to much other that cleaning nuggets. You can get acids and others cemicals at A&B in Mesa and I am pretty sure they will ship.
As for the microwave kiln, I have seen this system in action, and it does work for small batches. I think the cost is about $250, without the microwave. This system might be useful if you had a bunch of cons to fire but I would think it to be pretty expenisive for just a little bit. Hope this helps... Here are a couple links that might help.