Search results for query: hood

...how can i recover this palladium and gold from the black powder without Ar and ammonium chloride and sodium chlorate again.. ? there are any form to wash it? and yes, i have a proper fume hoods and PPE for this. and i know PGM salts are exceedingly toxic. Nothing answer my questions. thanks.

...thank you! I would love to be able to work with nitric to do all of this in house, but my concerns are for safety of course. Would working with nitric outdoors with a respirator/face shield (sans ventilation hood) and basic PPE such as PVC apron, gloves, etc. be acceptable with minimal risk?

...thing I could add is to make the floor out of a PTFE sheet and run a small side and back splash out of it. Spills happen and the floor of the hood takes the brunt. It's a bit pricey but the best I've found for Sulfuric, Nitric and Hydrochloric resistance. Pick up a can of Liquid Plastic and...

Why not try poor mans' nitric. Sodium Nitrate or potassium nitrate + sulfuric acid. These can be found in garden supplies and hardware stores.

Under 50 grams. I have an aquarium air pump. How long would you suggest with the hydrochloric and air pump? I have an organic vapor respirator, but where should this be done without a fume hood? Also, where do you store the used solution? Thanks

...bisulfate with heat and letting it soak but it was not enough. I have muriatic, hydrochloric, and nitric acid available. Can someone tell me what the process would be? I don’t have a fume hood and until I do, don’t really want to make Aqua Regia and go through the whole refining process. Thanks

Hi Moving away from all the harsh acids until I get a fume hood, I've decided to cupel for the moment. There seems to be a bunch of sizes. i.e. 7AL Mabor, 7X Mabor, 8A Mabor, etc Can someone explain what these mean? Thanks Kenzo

...as well. The hardest part of both is not over using the nitrate. If you plan to do this more than once it is worth setting up a simple fume hood, getting at least one Corningware dish capable of holding a one liter beaker, and a budget hot plate. I have seen a simple plastic tote box turned...

Chemically, a good try is 30-40% sodium hydroxide, heated to simmer. But treat with caution and in a hood!

There are no masks or filters that will remove all or even suffient amounts of NOx and other nasties from the reactions that may happen with acids and ores. If you see the major operators in the industry use a process it will be the one that makes economical sense. AR is not one of the processes...

I have to say I'm so glad to see a new member reading before asking! Welcome!

whether you are required to run a scrubber or not will depend upon your local laws as to the volume of chemicals you go through before you are required to have a scrubber. some of the larger commercial guys on here will be able to answer these questions better for you. i'm just a hobbyist, and...

...is that evaporating the solution produces no airborne nitrates, nor NO2. Just water vapor. Is this correct? I'm currently evaporating it in a closed, well ventilated room, but I don't have a hood. Can someone confirm I'm not putting airborne contaminants into the air with this method?

I will not be too helpful here because all of my fabrication contacts are here in the USA and, since I work with mostly commercial guys, their budgets are significantly greater than the 5-10K you mention as your budget. But this forum is full of members who built their entire setups using DIY...

I had a meeting this morning with a major player in the precious metals markets here in Canada, and he gave me the following advice. Aqua Regia isn't a scalable solution for our needs, and they bought this Italian equipment (as you showed here), and had what can only be described as mixed...

thank you shark, ive got a quick question im gonna attach a drawing for reference but i still need to vent and duct the hood and because i went so big id need a really big fan what i was thinking is going for two vent holes on the box with a double venturi so the big blower would be pushing...

Hey guys! I'm trying to understand the concept of the NOx scrubber described by 4metals on page 3 of the gallery of home built hoods. I think I generally understand the concept but there is a few things that are still unclear and was hoping some of you guys can help me wrap my noob head around...

...I was curious what happens to the air speed of a 6 inch 440 cfm fan when reduced to 2 inches. I was going to use the 6 inch fan at first in my hood but realized it was too small. I'm not changing the piping so the intake will be a 6 inch pipe reducing upward to a new 12 inch fan so...

...with hot water. This is to remove the cyanide from the solids. Collect the rinses and put them with the solution collected earlier. While a hood is not necessary for the first steps, it doesn’t hurt. The following steps however, MUST BE CARRIED OUT IN A FUME HOOD! Add a small amount of...

Welcome to us. Youtube is more like a Russian roulette endeavour. There are good video producers out there, but most are not, and some even may do more damage than good. Sreetips, Owltech and some more are good and also members here. Study the forum and read, learning to search will pay dividends.

...You are wise to be seeking an analytical result that is reproducible and accurate. As it is at 0.4% Silver the value per ton is an the neighborhood of $3700. And that's based on content not cost to extract it. I would guess the number from a reliable assay will increase and it is worth the...

Any mask will have a relatively short life time after the canister is opened. And the red cloud NOx from Nitric is beyond masks ability. Having a decent fume hood and a system for catching the fumes should suffice. Something like this:

G day all I have had a bit of fun with the same problem not so long ago in the end i used a1.5lt glass retort on a stove top (in fume hood) and did small lots at a time with plenty of water and had to keep it as agitated as possible and then took the gold to AR twice, It is not as easy to get...

...quality" utensils :) (sarcasm) Would it be for your use, or you plan to build them to sell to people ? If you want to build small modular hood for hobby work, I recommend to use IBC container as chassis - as it is HDPE (top corrosion resistance), easily fitted with vent hose from the top...

Do you have a fume hood? The gases AR very toxic and dangerous for yor langs. If it is created a lot of fumes/gases you are wasting acid. What are you dissolving? Nitric alone will not be effective on karat higher than 6. And Aqua Regia will not be effective on 14 karat and lower depending on...

...silver my only hangup is what to do with the fumes for the reaction so i can safely expell them from my roof. from point a being the fume hood to point b being the roof how do i get there? can you make me a diagram using 6 in pvc for the duct material and the filters/blowers/scrubbers of...

...away run away mentally. So my question is? are there any other viable options to safely melt metal short of installing a full smoke extraction hood in my small shop because my fume hood is small and cramped and my reaction chamber and scrubbers are not movable easily. I would still prefer to...

the un-economically recoverable gold is usually trapped in ductwork and the seams of your hood from small spills. It represents less than 0.0005% of what you start with. The losses from testing and trapped in chlorides is easily recovered.

I really do like dissolving base metals with nitric and then finishing with AR it just uses so darn much nitric. I like the CuCl2 leach but absolutely hate vaccuum filtering the massive amount of nasty black solution. I guess it's all a "give and take". I have a LOT of different styles of pins...

...use some help. to start off modestly, we have identified and edited 7 subjects. 1 stannous chloride 2 cementation 3 inquartation 4 building a hood 5 building a fume scrubber 6 poor mans nitric acid. only1 entry so far need input 7 gas melt furnace to access these threads, and only the...