Gold recovery from Computer Parts/How to Recover gold from E-waste/E-waste Recycling

How to Recover Silver from Electrical Silver Contacts?/Silver Recovery/Silver Recovery Business/How to Separate Silver from Copper

Silver contacts are either made of pure silver and soldered on copper strips, or copper contacts are coated with a thick layer of silver. In both conditions, silver can be recovered with nitric acid (HNO3).

If the silver contacts are soldered on copper strips, you can cut the copper strips with a cutter to separate the silver contacts from them. Now place all of the silver contact points in a stainless steel pot. Take one part nitric acid (68%), one part water, and mix them together. Now pour this small amount of dilute nitric acid onto the silver points in the stainless steel pot. The copper and silver will react with nitric acid and start dissolving into it. This reaction produces some smoke. So, either you should do it in the open or in a room with an exhaust fan, so that the exhaust fan should send all the smoke out into the air. Keep pouring dilute nitric acid into the pot till all the metals dissolve into the solution. Now there are two metals in the solution in the form of nitrates, that is, silver nitrate and copper nitrate. First, we will recover silver from this solution. To do that, take HCL (hydrochloric acid) at 35% purity. Mix HCL with silver nitrate solution in small increments. When silver chloride stops separating from the solution, stop adding HCL. Decant the solution when silver chloride (AgCl) has settled completely to the bottom.

 Heat up some water and add it to the silver chloride. You can use a plastic pot to do so. Take round iron pieces of around two inches in diameter and half an inch thickness. Put these iron rings onto silver chloride in a plastic container. With a wooden rod, slowly move around these iron rings for a while. Silver chloride will start changing colour and converting into pure silver. Once there is no more silver chloride in the container, stop stirring the rings. Now you have pure silver dust. Take out the rings; wash the silver dust with plain water three times. Dry this dust and melt it into a solid piece of silver.

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How to Recover Gold from Chips?/Gold Recycling from Chips/Gold Recovery from Chips/ Gold Recovery from Cumputer Chips

There are numerous methods for recovering gold from chips. One method is that you first crush chips and then grind them into a fine powder. Then, using a shaking table, you can recover gold through density separation.

Another method is that you can first burn chips in the open, which will create some pollution. If you want to avoid pollution, you can burn chips in an oven or incinerator and use a scrubber that will neutralise the smoke during chip burning. Chips take some time to burn, so you should make sure that they are burned properly. Let the burnt chips cool down before proceeding further. It takes two to three hours for the burned chips to cool down.

Now put these burnt chips into a grinder for five to ten minutes to turn them into a fine powder. You can do it manually by using a mortar and pestle. Check out a sample of the ash. If it is not fine, give it a little more time in the grinder. After this step, you have to separate the pins from the ash. For this, you can use a sieve. These chips have very thin gold wires inside. The gold wires blend in with the ash, aiding in the separation of the pins. The pins also fetch you a good amount of money. So, keep them carefully, and sell them to a metal trader when they are in good quantity.

You can treat this ash with an aqua regia solution. Prepare aqua regia by combining one part nitric acid with three parts hydrochloric acid. This ash should be stirred continuously in the aqua regia solution for five to six hours. Stirring the ash manually for such a long time is not possible. So, you can use a motor, a wooden or plastic shaft, and plastic blades for this. Thus, all the gold will dissolve into aqua regia. This aqua regia solution is filtered using a filter cloth. Recover the gold with sodium metabisulfite.

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