|
Post by satamax on Aug 23, 2014 4:31:49 GMT -8
Hi everybody.
Well, after a while thinking that my suroundings didn't have any clay, i've learned that there is some calcareous clay in the bottom of the valley. Full of stones tho, and it's not what i would have expected. It more grey than clay colour. Any use for this stuff? It's full of stones, but it can be sieved.
And i have calcareous schists around too! Thick slate called lauze. This one i don't expect much from it!
And the best part, i have bilion of tons of pink quartzite right behind where i live. Suposedely refractory, and capable of whistanding more than 1400C°. I knew it was there. I knew the properties of the white quartzite, but didn't pay attention to the pink one. Any hope for this stuff? Crush it and mix with clay to make the cores?
Thanks.
Max.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 23, 2014 5:50:53 GMT -8
|
|
|
Post by satamax on Aug 23, 2014 7:19:09 GMT -8
Vielen dank Karl!
|
|
|
Post by satamax on Aug 29, 2014 21:42:27 GMT -8
Karl, i haven't read much of the PDF you linked. But did a little testing. I hit the quartzite with a oxy acetylene torch. If brought to temp way too fast, the first layer, of a few micrometers explodes or bubbles away. But after, i tried to take away the inner cone from the stone. And that did the trick, no more bubling on the surface of the quartzite bit. And it seems to be able to whistand a nice temp. The photo below was taken in the dark, because it took me some time to get the camera out. But it was bright orange, seeable in full light, just seconds before. Could be intresting for geopolymers?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Aug 30, 2014 1:38:25 GMT -8
Quartzite is quartz with less than 2% impurities. Quartz as any form of silica is polymorph. Quartz has a very high melting point, but undergoes phase changes due to polymorphism, at high temperatures, which may cause problems.
|
|