Separation of copper and tin alloys in waste electronic components
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Waste electronic components contain about 90% copper and around 10% tin-lead alloy. The separation methods include wet processing, thermal processing, electrolysis, etc. Could you discuss which of these methods is the best for separation?
1. An oxidizing alkaline solution is prepared using caustic soda and sodium nitrate; under heating but without boiling, tin is converted into sodium stannate, thereby separating it from copper. 2. Quickly clean in acidic solution to remove the tin from the surface through stripping. 3. Wash the tinned copper wire in a chloride melt at around 400 degrees Celsius to melt the surface tin and separate it from the copper.
If the scale is large, the melting–pyrochemical oxidation refining method can be employed to produce qualified copper anode plates for electrolytic refining. During the oxidation refining process, both tin and lead form scum with silica and are removed.
Are there any friends who have used the \"direct electrolytic refining method with stainless steel anode frames and miscellaneous copper\"?
It is best to use thermal methods; rotary kilns offer a fast separation speed and good results, enabling the recovery of over 80% of the lead-tin alloy in one go. Copper feet can be purified by a simple acid wash, resulting in a purity level of over 95% with a 95% recovery rate.
Chlorination leaching can be used; by adding sulfuric acid, it is possible to leach over 99% of the copper and tin. After filtration, iron powder is used to displace the copper, and after further filtration, ammonium bicarbonate is added to recover the tin
Qualified copper anode plates can be produced through oxidation refining using anode furnaces or tilting furnace methods, followed by electrolytic refining. During the oxidation refining process, both tin and lead form scum with silica and are removed. Copper-tin alloy is what is known as bronze, and fire treatment is the most suitable method for it.
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Friend on the 2nd floor, it seems that the first method won’t work. How can I get in touch with you to communicate? My phone number is 13575546378
Acid leaching has been successful, but large-scale production is difficult