Geopolymer slag??????

[firewatcher]

May 28, 2018 21:39:36 GMT -8 gadget said:

May 20, 2018 14:10:50 GMT -8 drooster said:

Great for mass,
but even finely ground not great for refractory ingredient.

I took a torch to some slag I "borrowed" from a drive way today. It melted to glass fairly easily. It became more brittle the more I heated it. Some pieces cracked after heating. Very crumbly after firing. Much weaker then before heated. I'm not seeing much bonding from heating other then going to very weak glass.

So....drooster appears to be correct...not the best refractory material.
-Gadget

Gadget,
What exactly is the "slag" that you torched?
I've never tried torch heating a pile of the material that I have (sand blasting material that's supposed to be slag), but it's my understanding that the stuff is supposed to come from blast furnaces. I don't know what temp they get up to, but I wouldn't imagine that there would be much that you or I as a general consumer could do to get up to the kind of temperatures that I imagine a full blown blast furnace would reach...
...maybe a welding torch?

[branja]

Oxiacetylene torch burns around 3000 C. Plasma cutter up to 5000C.
See this.
www.quora.com/Can-amorphous-solids-be-converted-to-crystalline-solids-by-annealing-If-yes-how
You just made some bad glass.(silica crystal)
By brning a bunch of slag you dinot show anything. First make a GP or AAM , then burn it. The slag needs to have a chemical reaction first (to become "not-slag")
Edit: cyanogen is 5000 C , plasma is 10k+