I need equipment to dissolve direct ore sample in H2SO4 in high pressure and temperature, without baking.
If use not strong sulfuric dissolution works by heat, pressure, or both. So it shouldn't make much difference as long as your vessel can withstand either (or both). I like the idea of vessel turning like rock tumbler of cement mixer. Just depends what you're extracting as to how.
If 10% H2SO4, 100 °C, 2 Atm. are requisite conditions, there are autoclaves which can allow such conditions. Just make sure the acid vapors don't corrode autoclave. If I knew what you're trying to do I could better help. Like which ore and what you're trying to extract, size(s) sample(s) and why the pressure? The boiling point of 10% H2SO4 is NOT 100 °C. Just need more info...
Also, you can raise °T if you raise Pressure (to 2 atm) without fear of boiling. I just don't know why you need the Pressure. Maybe to ensure no possibility of boiling? or that's just the way it's done? There are many conditions one could employ to extract but not knowing what the goal is for what trying to do makes it hard to specify autoclave conditions. Let us know...
This is getting dangerous. Hot, pressurized HF is extremely reactive, even eats platinum coatings. If your vessel ruptures under pressure, deadly conditions prevail. Please excuse me from advising you, that's the job of whomever you work under.
I am remiss to hear that you have been put to task without guidance.
I have experience in and have consulted on these particular conditions. If I were you I would try to find procedures commonly used mineral processing. I will have a University friend join this discussion to contribute or advise as to proper help/procedure/etc.
It depends upon the MOC of your autoclave and temperature of your reaction as u might be aware of H2SO4 storage conditions it is generally stored in MS so you have to check the compatibility of metal vs acid
Compressed fluorine containers used in pressure vessels are either copper or nickel alloy (don't know which alloy) AFTER a slow treatment purge with F2 gas which passivates surfaces. However, the presence of water (from 10% H2SO4) will generate HF vapour which will continue the corrosion, contaminate eluate and ultimately render vessel unable to hold pressure. So, the next step would be to acquire a teflon cell and then jacket it with something hard like metal, concrete, etc. pressure fixtures and lines must be teflon coated inside and threadings greased with teflon grease ONLY. It would be helpful to know what you're extracting from which mineral composition. Pegmatite is a generic term of multivarious mineral compositions. I asked my Mine source friend but she said it's way over her head. I can suggest no more without further information. This is very dangerous to do the way you want. You need to take this seriously. Perhaps the contact with whom advises you at the Univ. is who?
For your purposes, you can use teflon container in addition to the autoclave. In this case you are able to prevent acidic madia impacts on metal autoclave
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