I Am A Refiner(gold) I Refine By Aquaregia Method I Need To Know The Latest Tecnology To Precipitate Gold?
(1)I TRYED FERRIOUS SULPHATE IT TAKES VERY LONG TIME TO SETTIL THE PRECIPATED GOLD (2) SODIUM METABYSULPHATE IF IT IS ADDED LITTIL EXCESSES IT CONTAMINATES THE GOLD BUT NOW DAYS I AM USING A CHEMICL WHICH IS IN LIQUID FORM AND IT SMELLS LIKE AMONIA AND WHEN IT GETS CONTACT WITH COTTEN IT GETS HEATED AND SMOKE COMES OUT OF IT ANY HOW IT IS THE BEST THING THAT I HAD TRYED THE PRECIPITAED GOLD GETS SETTELED VERY QUICKLY AND I GET A GOOD PURITY ALSO (I HAVE TO DILUTE 100 ML OF THIS CHEMICAL WITH 700 ML OF WATER TO PRECIPITATE 300 GRAMS OF GOLD
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The latest technology is bio extraction using plants and microbes to extract gold from the source rocks.
I suggest that you go in for cyanide method. Not free cyanides but in the complexed form.