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CN Process

CN process can be used for removing gold from gold plated electronic waste like connectors, fingers, jewellery and any other stuff which has gold polish on it.

For the recovery of gold through this method one has to use commercial grade sodium CN (NaCN) because is less risky and cheap than potassium CN. Some people think that NaCN doesn’t do good and fast job like KCN. But due to incomplete knowledge they say this. It works wonders if use it properly. Just need to maintain the temprature of the CN solution and regular flow of oxygen into the solution, for oxygen we can use pumps or we can drop hydrogen peroxide into the solution because hydrogen peroxide releases necessary oxygen in to the solution. All gold will come into the solution and the colour of the white CN solution will become yellowish due to the gold dissolved in it. Now we can precipitate gold from it by different methods like copper CN etc.

Note : If solder or aluminium is present on the stuff, we must remove it chemically before doing CN process otherwise we will not get the complete recovery of gold in the end.

After doing the complete process of gold recovery, we must neutralise it. For that many chemicals from different companies are available in the market. You may contact us to know more.


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