[Cob] has anyone made their own quicklime?

[karl and tabitha o'melay]

i guess i'll do the lime experiment along with ben (my boss & historic 
stone mason) he just came back from a conference where they made it. he 
knows all the specifics regarding it. I'll let him handle the stuff.

he says it is dangerous but fairly easy to make and with proper 
precautions.

i imagine that my wood stove gets above 1752 degrees F. since the 
efficiency of the unit suggests that it burns the gassified wood which 
(if memory serves) is above 1800 degrees F.

i'll let you know if the experiment takes place and the results.

not to worry i'm wearing gloves, a rubber apron and goggles just writing 
about quicklime.

k-)

Amanda Peck wrote:

>
>
> Roasted = quicklime, I'd guess.
>
> Even small operations used to use kilns.  Why we have a Lime Kiln Road 
> in the county here.
>
> If you don't transform the rock pretty completely you'll have nasty 
> lime putty, with pieces of stone in it.  Might be able to overcook it 
> as well.
>
> from the pottery people--here are two links, one talking about 
> earthenware, the other giving final termperatures for the cones.
>
> http://www.claytimes.com/claybscs.htm
>
> "Earthenware clay contains a percentage of iron and mineral impurities 
> high enough for it to mature at firing temperatures from "bonfire" 
> heat at around 1300 degrees F, up to about 2120 degrees F (cone 
> 018-cone 3*). In its raw state, the presence of iron oxide makes this 
> clay appear brown, red, gray, or greenish. When fired, it's anything 
> from red or tan to brown or black."
>
> http://www.pbapottery.com/pdf/ConeTemperatureChart.pdf
>
> I think I'd try to fire a piece of earthenware in the fireplace, maybe 
> even with a cone.   Earthenware will fire at "'bonfire' heat" so a 
> piece of well worked clay (no air bubbles, they can explode) should 
> tell you a lot.  When I picked up pieces of pre-Colombian 
> pottery--earthenware, the lowest temperature firing--in Mexico about 
> half the time they looked very much like they had not fired 
> completely, distinct color change in the center of a shard.
>
> When I was a kid I'd try this, never got anything that I thought 
> looked like it was fired worth a flip.  Just well dried.  Of course 
> this was in the ashes at the bottom.
>
> But remember that limestone will give off CO2 when it's heated.  Won't 
> help the burning process any.
>
> ===============
> Jon asked Robert:
>
> Usually I'm not so pedantic, but since this is a fairly dangerous  
> process, I'm going to request a little bit of proofreading/ 
> clarification here:
>
>> I make my lime putty from roasted limestone.  I buy it pre-roasted.
>
>
> --Okay, where does one buy pre-roasted limestone?
>
>>
>> <snip>
>>
>> What your friend says seems correct.  Roasting at 140 degrees
>
>
> ---did you mean 1400 degrees?
>
>> should
>> dehydrate it. How long did he suggest roasting it?
>> Best wishes
>> Robert
>
>
> \
>
>
>
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