solar_plasma said:Very impressive. Though, the guy had no heavy gloves, I wonder how many times he will survive those dangerous experiments. Nothing anybody should try, is making such experiments for the government, like BAM in germany. What is the equivalent to the Bundesamt für Materialprüfung in the USA?
martymcfly said:Ok so this is probably a no brainer. Its really dangerous . but im wondering just how much of this stuff do you have to inhale before your going to see problems?
For instance would getting a whiff from mixing a small amount like 10ml do you harm or would you have to be mixing a litre of the stuff and having serious smoke before its a proper danger?
Has anyone on here had any accidents where they have been exposed and felt ill due to it?
What about a carbon filter in your fume hood vent?Due to this topic i wonder is it possible to filter out some or most of the fumes by the vent of your fume hood?
Forgot, since I seldom use the feature. Sorry.But private messages are only read when a member visits the forum.
Dave
Yeah, to the certain point. Thy disperse quickly, but downside is they can be smelled in very low concentrationsNo need to filter the fumes. While nitric fumes are very deadly in an enclosed space, they dissipate quickly. If your fume hood vents out through your roof (20’+- agl) there’s nothing to worry about.
Maybe the 20’ above ground level works in suburbia or rural settings but in a city it’s much different. I knew a refiner in a single story building who had much taller buildings on both sides. He had to move because both neighbors could look out their windows and look at his stacks. He knew sooner or later he would piss someone off.If your fume hood vents out through your roof (20’+- agl) there’s nothing to worry about.
In utmost simplification, nitric is just an oxidant. Hard to get, causing problem anywhere it appears in classic AR refining scheme. NOx gasses, need for de-oxidation of nitric residues...Here in the US you can apply for and be granted a “de minimus” status which usually means you use less than 10 pounds of Nitric acid a day. The catch is if anyone complains about the smell, even if your usage is under the limit, you still need to scrub it.
Maybe the 20’ above ground level works in suburbia or rural settings but in a city it’s much different. I knew a refiner in a single story building who had much taller buildings on both sides. He had to move because both neighbors could look out their windows and look at his stacks. He knew sooner or later he would piss someone off.
He moved to a tall building on the top floor for that very reason.
I need to get familiar with chlorate dissolution, as it can easily be made by electrolysis in bulk. As I have quite a bit of fear using chlorates in general in acid media, from one incident with ClO2.Atomizing the material allows for easier digestions with Hydrochloric Acid and chlorine. A convenient source of chlorine is sodium chlorate. Just keep
It from getting too hot and running away. Keep
it around 50°C and you can control it easily. Ice is your friend.
Say a little more about your encounter with the dioxide.As I have quite a bit of fear using chlorates in general in acid media, from one incident with ClO2.
Yeah, that is the way. It was presented to me very similarly by my boss once he talked about it´s use from his early days in refining.I have always used it as a powder added directly to the reaction. I always use the Hydrochloric Acid at azeotrope strength for the process. With care, attention to the temperature, and slow additions, it produces an aqua regia like reaction that can be stopped by stopping the additions and cooling. This is only doable with finely divided feed material, such as atomized alloy.
Storage is a big concern, keep it dry and away from organics and keep it from interaction with the environment.
Say a little more about your encounter with the dioxide.
Excuse me, I have a question for you. What is AR?A friend of mine just got a fairly large burn, probably 2nd degree, on his arm from working, for a short period of time, over the hot red fumes produced from dissolving copper with nitric in a bucket.
NO2, the red fumes produced from dissolving metals in nitric or aqua regia, rats seemingly have an LD50 of 88 ppm over a 4 hour exposure. That's a little less than 1 part NO2 per 10,000 parts of air. LD50 (lethal doze for 50%) means that 50% of the rats exposed to that dosage will die. I also read that the symptoms may not show up for 72 hours.
Although the gases produced from just mixing AR are noxious and toxic, the greatest danger is the NO2 gas produced when dissolving metals.
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