Aqua Regia Safety
Aqua regia preparation involves mixing strong acids. The reaction produces heat and evolves poisonous vapors, so it’s important to follow safety protocols when making and using this solution:
-Make and use aqua regia solution inside a fume hood, with the sash down as much as is practical to contain the vapors and protect against injury in case of splashing or glassware breakage.
-Prepare the minimum volume needed for your application.
-Make sure your glassware is clean. In particular, you don’t want any organic contaminants because they can produce a vigorous or violent reaction. Avoid using any glassware that may be contaminated with a chemical containing a C-H bond. Do not use the finished solution on any material containing an organic.
-Wear safety goggles.
-Wear a lab coat.
-Wear gloves.
-If you get drops of any of the strong acids on your skin, wipe them off immediately and rinse with lots of water. If you spill acid on clothing, remove it immediately. In the case of inhalation, move immediately to fresh air. Use the eyewash and seek emergency medical attention in case of eye contact. In the case of ingestion, rinse the mouth with water and do not induce vomiting.
-Neutralize any spills with sodium bicarbonate or similar compound. Remember, it’s best to neutralize a strong acid with a weak base and not a strong base.
The safest way is always to do it in a self-contained, sealed system that scrubs fumes. However, no matter what chemicals or procedure you chose.
Environment
If refining in-doors, a complete, sealed, refining system, with a fume scrubber, is strongly recommended. Even when working with environmentally-safe materials, such as MX3 Dissolving Agent or Quadratic Precipitant, you still must use muriatic (another name for hydrochloric) acid. The acid fumes need to be contained to prevent corrosion of your tools (and your lungs). So a sealed system with a built in fume scrubber is essential. If you’re working outdoors, you can use ordinary buckets and beakers.
Chemicals
Which chemicals and which equipment you choose will define the potential hazards in the refining procedure. We built a questionnaire-guide for choosing the supplies and equipment that fit your needs.
You’ll need some sort of Dissolving Agent for dissolving your metal, as well as a Precipitating Agent for precipitating your particles.Below are comparison charts for commonly-used dissolving agents and precipitants, comparing and contrasting the pros and cons of each one. These same charts will reappear in the relevant sections of this guidebook.
Dissolving Agents
| Dissolving Agent | Sodium Nitrate | MX3 Concentrate | Nitric Acid |
| Corrosive? | Mildly | Mildly | Extremely |
| Toxic? | No | No | Yes |
| Shelf Life | Unlimited | Unlimited | Unlimited |
| Requires Heating? | No* | No* | No* |
| Dissolving into HCl | Slow | Instantaneous | Instantaneous |
Precipitants
| Precipitant | Sodium Metabisulfite | Ferrous Sulfate | Quadratic Precipitant |
| Corrosive? | Yes | No | No |
| Toxic? | Yes | No | No |
| Odor | Very strong | Odorless | Odorless |
| Shelf Life | Unlimited | 2 to 4 months | Unlimited |
| Requires Heating? | No | No | Heat to 160° F |
| Gold Particle Size | Small | Moderate | Large |
| Gold Particle Color | Light to dark brown | Light to dark brown | Golden brown |
| Costliness | Reasonable | Expensive | Reasonable |
Important Advice For Using Nitric Acid.
The conventional shape of aqua regia is a aggregate of nitric and hydrochloric acid. Nitric acid could be very hazardous. When mixed with hydrochloric and steel, it produces prodigious quantities of brown, very corrosive, poisonous gases, consisting of nitric oxide. These fumes are so corrosive that they’ll rust excessive grade stainless-steel with much less than 1 2d of exposure.
While those commands can even paintings for nitric acid, it’s far dangerous, luxurious and tough to obtain. The dry substitutes, either MX3 or sodium nitrate, are some distance safer, much less luxurious and effortlessly obtained.
Know How Much Metal You Want to Refine
Seems like a stupid component to ask, however understanding your steel content material in advance of time allow you to make certain you know the way a lot (and which) materials you’ll want. Your first step is to realize how a lot gold content material you need to refine. To do this, you need to get a consultant pattern of your valuable metals. The quantity doesn’t want to be exact, however need to be in the community of the way a lot steel you have. This is so that you don’t begin with too few materials or purchase too a lot.
Once you know the way a lot steel you need to refine, you may decide how a lot materials you may want to refine that steel. Knowing the suitable quantity of chemical compounds to apply will save you a waste of chemical compounds and offer you with the maximum within your means use of each the chemical compounds and your time.
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