How to handle the remaining chemical aqua regia water From gold extraction, Recycle, Refinery

Archimedes Channel
Archimedes Channel
89,288
0
Publicado 2018-10-15
‪@MakeGold‬ how to handle the remaining chemical water From gold extraction Recycle gold Refinery Refining Gold.
Urea, also called carbamide, is soluble in water and alcohol and is non-combustible. In gold recovery processes, it is used as a neutralizer of excess nitric acid in aqua regia solutions.
Sodium metabisulfite is commonly used to precipitate dissolved gold out of aqua regia and gold chloride solutions. When it is dissolved into water, sulfur dioxide gas is created which is excellent at precipitating gold from the solution. Sodium metabisulfite is a popular choice in this process because it is more selective in precipitating gold by itself. In the process of gold extraction from scrap computer electronics parts, Sodium Metabisulfite is usually used along with Urea.
Todos los comentarios (21)
  • @MakeGold
    Aqua Regia Definition Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning "king's water". The name reflects the ability of aqua regia to dissolve the noble metals gold, platinum, and palladium. Note aqua regia will not dissolve all noble metals. For example, iridium and tantalum are not dissolved.
  • @scottv6358
    Can you do a video on waste treatment. Thank you.
  • @ahmedmahdi1849
    I wonder why you used at first zinc powder and not sodium bisulfate to percipitate the gold
  • @arunruengronghiranya6557
    I didn't understand the gold powder in the last step. It should be brown or black. After washing with nitric acid What color should the gold powder be?
  • @princeangel1627
    why didn't you neutralize the aqua regia? can I precipitate the gold without neutralizing the nitric acid with urea?