Welcome to us.I new in this indduusstry, just learning, seeing video on Youtube, and faild 2 times,
I'm here hope to find what I miss, please support
Well you can start reading the links I gave you.Hi,
I'm happy to share my issue:
I have plates with 3 layer: gold, Niken and Copper and I start refining gold step by step as below:
Step 1: Immerse in a solution of nitric acid and water to separate the gold layers. After seeing that the gold layer has completely separated from the plate, I filter it through absorbent paper and obtain the gold-plated layer.
Step 2: I put the filter paper with the gold layer into the aqua regia solution (3HCL + HNO3) with heat, I tried to add as little HNO3 as possible by dropping until the metal was completely dissolved. After the metal was completely dissolved, I filtered the dissolved solution.
Step 3: I add in the same amount of water as the solution and boil until the water level returns to normal then let it cool, my purpose is to remove the HNO3
Step 4: I add SMB the solution, it turn to dark colour
After time, the solution appears precipitate but it stays cloudy and muddy, very soluble, i have attached a picture for you, i tested the water with stannous chloride and it turned black
Should I filter out this precipitate, boil the solution and continue adding SMB until I see a yellow precipitate or is there any other solution? Please advise.
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