camurgo
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Calcium Sulfide
Hello,
I've been unable to find Calcium Sulfide (CaS) for sale in my region (Brazil).
The places I did find it overseas were, so far, ridiculously expensive. Apparently if I can manage to buy it from China it's gonna be cheaper, but my
messages weren't returned yet.
Would anyone know of a seller to recommend?
Or maybe trying to make it should be my preferred route?
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Captain Chlorate
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Can u get h2so4 ? And calciumcarbonate caco3?
Sulfuric acid react with calcium carbonate
H2SO4 + CaCO3 → CaSO4 + CO2 + H2O
Edit : sry pls ignore it...i read caso4
[Edited on 12-8-2019 by Captain Chlorate]
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DrScrabs
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Mill Ca and Sulfur in a ballmill should work I guess.
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PirateDocBrown
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Just lime, hot water and sulfur, then purify.
Phlogiston manufacturer/supplier.
For all your phlogiston needs.
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Chemi Pharma
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I agree and think it's the only reasonable way to synthesizes CaS in a decent yield.
This reaction will produce a mixture of sulfide, sulfite and tiosulfate that will be hard to separate, I guess. We can't forget CaS decomposes with
water, so, I don't know if this reaction would be feasible. It's something similar to the process to synthesizes sodium sulfide from NaOH, sulfur and
boiling water, like said in the Patent attached below.
NOTE: @Camurgo, I have already answered your U2U. Read my answer, don't be so surprised and call me back as soon as you can by U2U, ok?
Attachment: sodium sulfide.pdf (855kB)
This file has been downloaded 387 times
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camurgo2
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@Chemi Pharma,
I created this secondary account just to let you know I'm currently locked out of my main account. As soon as this issue resolves I'll respond to your
U2U.
Explanation: I forgot my password, clicked on "Forgot Password" and am waiting for the recovery email for the last two hours. (Yes, I've checked the
spam folder).
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Chemi Pharma
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Quote: Originally posted by camurgo2  | @Chemi Pharma,
I created this secondary account just to let you know I'm currently locked out of my main account. As soon as this issue resolves I'll respond to your
U2U.
Explanation: I forgot my password, clicked on "Forgot Password" and am waiting for the recovery email for the last two hours. (Yes, I've checked the
spam folder). |
No matter at all @Camurgo. We can wait, heh, heh!
Just to know, the classic method to prepare CaS is reducing CASO4 (gipsum) with powdered charcoal in a crucible. Of course this is valuable only for
small quantities to be produced in the Lab.
Here's the procedure extracted from PrepChem.Com:
"Preparation of calcium sulfide
Unless the charcoal is already very finely powdered, it should be ground thoroughly in a large porcelain mortar. 48 g of charcoal are mixed with 145 g
of gypsum (CaSO4 • 1/2H2O; plaster of Paris) and placed in the clay crucible. The crucible is heat in a gas furnace to between a bright red and a
yellow heat for 1.5 hours. At the end of the reaction, the crucible is removed from the furnace and when cold, the contents of the crucible are
inspected and there should be no unburned charcoal left. A small sample should dissolve with effervescence in hydrochloric acid and leave no residue
more than a slight turbidity.
Synthetic inorganic chemistry, by A. A. Blanchard, 150-151, 1936"
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camurgo2
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Thank you.
I found an old thread here discussing several methods of synthesizing CaS:
http://www.sciencemadness.org/talk/viewthread.php?tid=1245
I think that, considering my current lab setup, the method you've mentioned is the most doable for me right now.
[Edited on 13-8-2019 by camurgo2]
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knowledgevschaos
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Here is an article explaining how to make phosphorescent calcium sulfide through heating oyster shells. pure calcium carbonate should work for making
the pure substance, but oyster shells apparently work better for producing a phosphor.
https://sciencenotes.org/make-glow-dark-powder-oyster-shells...
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