500 gr powder of burned gypsum board was mixed with 150 grams powder of charcoal. The mixture was suppressed into a steel container from
polyurethane foam by 800 ml.
The container with the mixture was placed in the furnace on firewood. The stove heated for several hours. After heating, the container was extracted
from the furnace. After heating, the metal of the aerosol cylinder scattered in hands, but it enough for 1 reaction
370 grams of powder was extracted from a broken container. The powder was mixed with water and left in an open container for a month for oxidation.
After oxidation, the dark orange solution was filtered from sediment and oxidation was repeated for another week.
As a result, 2 liters of densy solution were obtained. The solution is like soap and has an alkaline reaction. The solution consists of a mixture of
thiosulfate and calcium polyisulfides. When the solution is heated, it loses color and a precipitate also falls to the bottom (probably a mixture of
sulfur and calcium monosulfide.
Also, after filtering, there are 150-200 grams of powder. This is apparently mainly a mixture of carbonate and calcium hydroxide with some gypsum
It is planned to repeat the experience in a larger volume for optimization.
Thus, you can prepare both sulfur and calcium thiosulfate from gypsum. If you want thiosulfate, you need to oxidize the mixture for as long as
possible at elevated temperature. If you want to get sulfur, you can add hydrochloric acid to the solution. Also, sulfur apparently falls when heated
by a solution from polysulfides, but additionaon experiments are required. Wait for reports
[Edited on 19-2-2024 by Hexabromobenzene]Fery - 19-2-2024 at 08:15
Interesting experiment! You could probably obtain a mixture of thiosulfate with polysulfides by boiling water + Ca(OH)2 + S as it works with NaOH /
KOH but I'm not sure whether with poorly soluble Ca(OH)2 too. I remember I saw a can with barium polysulfide for gardening few years ago so maybe
Ba(OH)2 could be used for analogous experiments or your way BaSO4 + C too? But your goal seems to be obtaining thiosulfate and sulfur.bnull - 19-2-2024 at 11:27
You could probably obtain a mixture of thiosulfate with polysulfides by boiling water + Ca(OH)2 + S as it works with NaOH / KOH but I'm not sure
whether with poorly soluble Ca(OH)2 too.
It does. Ca(OH)2 is soluble enough for the reaction to proceed.
