Thanks for good answer. I've played around with fire mortar, but it was rather crumble stuff and I've got to find better. Im gonna try porcelain
first, if it fails, then I'll look for more specialized stuff.
The probable batch size would be something like 10kg. I have furnace made from firebricks and I use 1000m3 line fan and I have supply of anthracite at
flat rate of 350 bucks a ton. Gypsum will cost 50cent per kg, sand is technically free, so let's make a quick calculation..
For a batch, I'd use(abouts):
2720g of CaSO4 for 1.50
1200g SiO2 for 0.05
(240g)+300g of C, 0.12
Heating would probably consume up to 3-5kg of coal, making 1.75
Ice and freezing and other running costs 2.00 per run
Ideally this would allow for 1960g of 100% H2SO4 at cost of 5.42 per run, but probably the actual yield would be 1200-1400g max. Ok so, the budget
just doubled. Here we can see that one would need about the same for 5 times larger amount of coal and cooling, so the price per kg would rock down
from 5.42 to 3.50 or equivalent of that. The apparatus for the process from total zero would cost maybe 300-600 depending of the conditions and wether
one needs a new freezer or not.
Point being that H2SO4 can be banned, but a ban for gypsum or other sulfate salts is more difficult to come. Second, high temp device is useful for
several other processes. I am aware that hydrochloric acid and even chlorine gas can be regenerated from chloride salts by roasting.
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