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Lots of talk here on this subject. here is my take on it. I have the copyright. Similar to thermite welding, but less energeticStep 1 Remove the silica and other light materials by whatever method suits your fancy.Step 2 Get the gold that you can out by your method of choice. No Mercury though.Step 3 Requires that you have some idea of the constituents of your sand. Make sure your black sand is bone dry. Weigh it. Add the gram equivalent of finely divided aluminum to replace all of the iron and chromium in your black sand. Step 4 Place the mixture in a crucible with a false steel bottom over a sheet mold so that the liquid iron will burn through and run onto the sheet mold. All crucibles and the sheet mold must be preheated.Step 5 Initiate burning with a magnesium ribbon, or do the process in a furnace. You now have a pregnant iron sheet.Step 6 using a plating bath containing ferrous sulfate and a little sulfuric acid, plate the iron onto a thin pure iron sheet. Use magnetic grade pure iron for the cathode, as you will want to sell the iron as electro refined pure when you are done. Its worth fair money BTW. Use an anode bag to catch the anode mud, as there will be your precious metals. No loss.
Things do not have to boil to vaporize and the action is more complex than a simple boiling action anyway.You have some pretty complex reactions (some totally unknowable without some complex chemistry on a specific sample).In its simplest form as soon as gold melts it has the potential to evaporate which is a surface phenomenon rather than a bulk materials vaporization though the amounts would be very low if other factors were not introduced. Adding a few things like complex oxides dumping their O2 into the fusion, exotic chemistry as various mineral complexes are reduced or burned off, chemical bonds broken and recombined, wide ranges of temperature throughout the melt as the fusion under the conditions described would not be uniform and a bunch of other variables and things are not so easy to predict.Consider the temperatures actually generated in the mix you describe. A burning mixture of aluminum, magnesium and iron is way hotter than the actual melting point of iron.The other factor is the fight for the fusion which is supported by the burning of metals to grab enough O2 to burn while at the same time reduce metals from oxides. Making my head hurt.I say mix it up and set it on fire - sell tickets - its gonna be neat no matter what happens.
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