[xzli]

I want to get small amount of Calcium Hydroxide 20g or so.   

I had burnt powder of seashell in stove top coil for several minutes,  what I got is white color powder.  I suspect if it is CaO.  The stuff looks like  don't react with water, not stick enough after mixing with water, not hardness enough after the mixture dry.

I check handbook, the calcium carbonate  decompose temperature is around 825.  I don't know if my stovetop coil have enough heat to decompose the seashell.  I guess the coil is around 700 to 800 c  degree, because it easily melt the aluminum foil.

[Burner]

I had burnt powder of seashell in stove top coil for several minutes,  what I got is white color powder.  I suspect if it is CaO.  The stuff looks like  don't react with water, not stick enough after mixing with water, not hardness enough after the mixture dry.

CaO(quicklime) reacts with water to form calcium hydroxide(slaked lime). You may have got other products if you can't observe anything after adding water to it.

[AWK]

Calcium carbonate start sdecomposition at temperature over 800 C.

[jasongnome]

I want to get small amount of Calcium Hydroxide 20g or so.   

I had burnt powder of seashell in stove top coil for several minutes,  what I got is white color powder.  I suspect if it is CaO.  The stuff looks like  don't react with water, not stick enough after mixing with water, not hardness enough after the mixture dry.

I check handbook, the calcium carbonate  decompose temperature is around 825.  I don't know if my stovetop coil have enough heat to decompose the seashell.  I guess the coil is around 700 to 800 c  degree, because it easily melt the aluminum foil.

Why are you using seashells for this? Because of their physical structure they have a low surface area for the reaction, and I would imagine they are also difficult to powder. I suspect you would get better results heating limestone or marble.

[Arkcon]

Probably because that's the raw material he could get.  This being the Citizen Chemist forum, its often par for the course.  Sometimes I wonder, does a Citizen Chemist do it the hard way because of necessity, or because its fun?

[billnotgatez]

... I wonder, does a Citizen Chemist do it the hard way because of necessity, or because its fun?

Maybe both