plante1999
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Production of crude calcium hydroxide using seashells
This is the version one.
I would like to know your opinion on this work, I worked quite hard to make it... I'm not native English speaker so I would like some help in this
point. I you could help my for grammar mistakes please contact me on the U2U system.
please look at the latest post for the latest version of this document.
Thanks!!!
Attachment: Calcium hydroxide production.pdf (1.1MB)
This file has been downloaded 5896 times
[Edited on 22-5-2012 by plante1999]
[Edited on 22-5-2012 by plante1999]
I never asked for this.
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plante1999
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There is a mistake on the reaction of calcium chloride and sodium sulphate. In next version this will be changed.
I never asked for this.
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Magpie
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I like it. Good work.
Your grammar is good. I had no trouble understanding any of it. I would change "lime methanol" to "like methanol," however. You could also change
"Somme" to "some."
I have made CaO myself several times but start with slaked lime, Ca(OH)2, from the "ranch and home" store. But I know you like to start with very
basic raw materials, right from nature.
Many limestones are more or less dolomitic, ie, contain a significant fraction of MgCO3. I don't know if this is an issue with seashells, however.
The single most important condition for a successful synthesis is good mixing - Nicodem
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plante1999
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It seam that my version 1.2 was deleted at the same time as the spam.
There was 120+ downloads 
As a side note there was in total of the two version 250+ download and only one reply, is my post so boring?
Attachment: Calcium hydroxide production V1.2.pdf (1MB)
This file has been downloaded 1425 times
[Edited on 17-8-2012 by plante1999]
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Vargouille
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"In fact when the blower of the furnace is turned off large amount of blue flame is made proving that the charcoal does not burn completely to carbon
dioxide."
I believe you've got it mixed up. A blue flame indicates complete combustion, while orange or red flames indicate partial combustion.
It is interesting, though. I may try this myself, albeit with a propane torch and a crucible.
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barley81
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I think he meant this:
Blue flame indicates presence of carbon monoxide gas; therefore, the charcoal didn't completely burn to CO2 in one step (rather, it first produced CO
gas).
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plante1999
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When the blower is on there is no flame but when it is turned off there is flames meaning an incomplete combustion to CO when the blower is on, but To
CO2 when it is off, Blue flame indicate this. That's a potter trick too. (I don't do pottery).
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Vargouille
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Ah, I see my mistake. I was assuming that the fire would always be in the visible range. Perhaps the answer takes advantage of this. While the blower
is on, the increased flow of oxygen allows direct reaction of carbon to carbon dioxide, which leaves the system. Photon emission would be in the
ultraviolet range. While the blower is off, decreased oxygen flow results in production of carbon monoxide, which ascends into a more oxygen-rich
atmosphere, and due to the heat, combusts to carbon dioxide, releasing photons in the visible range.
Perhaps a more mathematically advanced chemist can point me to a formula to test this hypothesis?
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plante1999
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maybe you are right, But from what I read yellow-white hot carbon make carbon monoxide since this reaction happen readily at high temperature:
CO2 + C -) 2CO
Edit:
I found the reaction I was talking about :
http://en.wikipedia.org/wiki/Boudouard_reaction
[Edited on 1-9-2012 by plante1999]
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Vargouille
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True, but in the industrial setup, how fast is the air circulation? If the CO2 generated from combustion is passed through carbon at too high a rate,
it won't comproportionate into CO fully, and once it exits the system, Le-Chatelier's Principle applies. Moreover, in a blast furnace, the air pushed
into the furnace is pre-heated to sustain the reaction. The carbon used industrially likely has a much higher surface area than the large charcoal
pieces used here, which supports the production of CO in a blast furnace. When you switch the blower off, the CO2 expands through the carbon due to
heat, leading to a much more intimate mixture than with the blower, and thus more CO production.
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pedrovecchio
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Excellent, plante1999.
I suppose chicken egg shells or snail shells can be used instead. They may be more readily available for some people.
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ElectroWin
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when i used egg shells, it ended up leaving a lot of CaS in there, as evidenced by evolution of some very smelly H2S when i tested it with dilute HCl.
maybe i did not heat it enough?
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