PinguForPresident Posted June 10, 2019 Share Posted June 10, 2019 I'm confused. How can CaO (so I've heard) be both used as a refractory and as a flux? Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted June 10, 2019 Share Posted June 10, 2019 Reference to its use as a refractory? Quote Link to comment Share on other sites More sharing options...
PinguForPresident Posted June 11, 2019 Author Share Posted June 11, 2019 http://donkey32.proboards.com/thread/1503/diy-refractory-mixtures OK so I think I understand this better now, so I'll say for anyone else who has seen this and is confused... CaO is used to flux the refractory to cause it to bond together better (turns into a sort of glass). This is also the case with some ashes, which is how Roman Cement gets its strength. I think certain materials create a stronger bond after they've been fired, but require a flux to allow them to be partially-melted in the first place. I think it has something to do with a pouzzolanic effect? Sorry for any confusion. Quote Link to comment Share on other sites More sharing options...
Frosty Posted June 11, 2019 Share Posted June 11, 2019 CaO isn't a flux in refractories, it's a high temperature caustic resisting cement binding aggregates. Whatever you're reading has it very wrong. It does NOT vitrify (turn to sort of glass) not even close. Wood ash as a cementing agent in some forge liners or primitive concretes is nothing like volcanic ash in roman concrete. pouzzolanic effect? Now you're just grabbing terms hoping for something to hang your hat on. You REALLY need to decide which you want to do, experiment with primitive refractories or learn to build a working forge or maybe casting melters. There isn't any practical advantage or benefit to reinventing mud. It can be fun as a sideline but doesn't even carry much for bragging rights, it's really old news/tech. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
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