First wash your minerals carefully in water to remove any loose sand and dirt and to make the acid last as long as possible (sand and dirt contain iron oxide and will exhaust your acid quickly).. Place your minerals in a large plastic container with a lid that can be tightly sealed.
These impurities usually consist of a small amount of black sand, a few iron rocks, and pieces of lead. There are many ways to go about doing this final cleanup. Personally, in general cleanup I like to stay away from the use of mercury, as there is a faster way without it.
It is a relatively strong acid for it's acid group. It is important to use protective gear when handling oxalic acid. The main use of oxalic acid can remove is as a bleach, particularly with wood and to remove iron stains all while not bleaching the wood.
You can use the acid bath to remove ferrites but it will take longer. Soak the remaining ore dust in muriatic acid and peroxide to remove the nonferrites. Remember even with the borax you will need to get the ore dust over 1000 degrees and most stoves don't go that high.
black sand concentrates have a large percentage of iron in the form of pyrites and magnetite's and sulfates along with a couple more forms.iron will precipitate values almost as fast as they go into solution. if you dont remove the iron first, your solution will always test barren.
Soak the concentrates in a 10:1 solution of nitric acid, which means 10 parts of water to 1 part of nitric acid. use a Pyrex beaker. This is to clean the gold. You can do a better job of this if you put the concentrates and the 10:1 solution in a rock tumbler with a plastic or rubber barrel (no metal, acid will corrode the metal).
Place your acid in a separate container, I choose used 2 liter or 3 liter bottles, Label these bottles as CLCu2 with a black sharpie marker. under that write may also contain trace amounts of NICKLE and ZINC, BERYLLIUM, CADMIUM and LEAD. You can take these items to your local hazard roundup or recycle your acids with a method I plan on ...
Edit Article How to Remove Gold from Circuit Boards. Two Methods: Removing Gold Using Nitric Acid Removing Gold Using Fire Community Q&A If you've opened an electronic device before, such as radios, televisions, or even your old cellphone, you've seen their inner workings.