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[Cob] Lime life cycle...Ocean Liff-Anderson ocean at woodfiredeatery.com
Wed Oct 8 00:47:46 PDT 2008
CaCO3 + extreme heat = CaCO (quicklime) - extremely volatile powder, can explode when water is added! CaCO + H2O = Ca(OH)2 (hydrated lime) + extreme heat(!) - this is the "slaking process", yield is good for lime plasters, lime washes, etc - be sure to keep under water! Ca(OH)2 + CO2 = CaCO3 (calcium carbonate) - also known as "chalk" or agricultural lime, inert ingredient, can't be used in lime washes or plasters if hydrate lime "dries out" then it reacts with CO2 to form CaCO3 - "agricultural lime" - as per Shannon's explanation Good luck! Ocean On Oct 7, 2008, at 11:10 PM, Shannon Dealy wrote: > On Tue, 7 Oct 2008, Carrie wrote: > >> I was just about to mix up some lime for a lime plaster, and I >> discovered >> that my lime is dry. It has been sitting in a covered 5 gallon >> bucket for >> some months; I guess I should have checked it sooner, alas. I >> have added >> more water to it but I have a couple of questions: > [snip] > > Once the lime has been wet and allowed to dry it is useless for > plasters > (particularly if it has been drying for any significant amount of > time). > What you have now is essentially a very expensive form of agricultural > lime (suitable as a soil additive if your soil happens to need > it). You > can keep lime pretty much indefinitely so long as there is a layer of > standing water covering the top of it, but once the water drops > below the > surface of the lime (allowing contact with the air), the reaction will > begin with that top layer and as the water level continues to drop, > air > (specifically carbon dioxide) will eventually react with the rest > of it. > > > Shannon C. Dealy | DeaTech Research Inc. > dealy at deatech.com | - Custom Software Development - > Phone: (800) 467-5820 | - Natural Building Instruction - > or: (541) 929-4089 | www.deatech.com > > _______________________________________________ > Coblist mailing list > Coblist at deatech.com > http://www.deatech.com/mailman/listinfo/coblist
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