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Author: Subject: Preparation of sulfur
plasma
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[*] posted on 20-5-2002 at 19:11
Preparation of sulfur


I belive sulfur can be made this way :

CaSO4 + 2C -> CaS + 2CO2 (heated)
CaS + 2HCl -> CaCl2 + H2S (H2S is very toxic gas)
Three ways of oxidizing hydrogensulfide :
2H2S + O2 -> 2H2O + 2S (Use charcoal dust as catalyst)
2H2S + SO2 -> 2H2O + 3S
2H2S + O2 -> 2H2O + 2S (H2S is burned in air)

I know theese reactions accur, but I don't know at which tempratures. Any comments ?
(I know sulfur can easely be obtained in stores, but unfortunantly that's not a fact in Norway)
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[*] posted on 20-5-2002 at 19:12


You could react the CaS with H2O2, much simpler.

8CaS + 8H2O2 --> 8Ca(OH)2 + S8




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plasma
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[*] posted on 20-5-2002 at 19:12


Thanks ! never thought of that one.
Will this reaction work with 5% H2O2.
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plasma
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[*] posted on 20-5-2002 at 19:13


CaS is a shiny transparent mineral, right ?

BTW why did you write :
8CaS + 8H2O2 -> 8Ca(OH)2 + 8S
and not just :
CaS + H2O2 -> Ca(OH)2 + S

What temperatures should be used +

Thanks
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[*] posted on 20-5-2002 at 19:15


Correction :
CaS is not a shiny transparent mineral, it's a grey solid. CaS is also fluorescent, this means it glows in the dark.

NOTE: The temperatures needed for the reaction is rather high and it should be done in a cheramic bowl. I heated this mixture (CaSO4 & C) in a steel vessel, after 25 minutes of heating the vessel started to melt.
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PHILOU Zrealone
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smile.gif posted on 10-4-2003 at 12:42


The fact CaS is fluorescent lyes in the fact the impure CdS and ZnS are in too when natural mineral is analysed! Synthetic CaS displays no fluorescence!
:)




PH Z (PHILOU Zrealone)

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[*] posted on 10-4-2003 at 12:48


he didn't wrote:
8CaS + 8H2O2 -> 8Ca(OH)2 + 8S
he wrote (sub added):
8CaS + 8H2O2 -> 8Ca(OH)2 + S8

S8 is OctoSulfur, i know it exist but i dont know much else sorry
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[*] posted on 30-6-2003 at 06:53


H2S could be decomposed by heat at about 400C.
I don't know how you could make use of H2, though.
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[*] posted on 30-6-2003 at 07:44


Quote:

You could react the CaS with H2O2, much simpler.

8CaS + 8H2O2 --> 8Ca(OH)2 + S8


Are you sure this wouldn't produce CaSO4 instead? I've seen H2O2 used to convert PbS to PbSO4 to restore old paintings.




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[*] posted on 30-6-2003 at 08:45


True, I was thinking of the same problem.
The H2O2 method will work with H2S IIRC.




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