solarnevo1
Active member
- Joined
- Jan 27, 2012
- Messages
- 42
My first lot of 17 kg of old ceramic chips. Started with 17 kg of chips, all IC's are with gold under the silicon chip. Process description:
Step 1: al IC's are submerged in hno3. After one month hno3 is replaced with fresh acid. Acid will disolve legs and silicon layer between two halfs of ceramic. This process will last for 2-3 months.
Step 2: after 3 months in hno3 all chips are disolved and splited on two halfs. Wash it with tap water until water becomes clean. Dry leftovers and use strong magnet to clean all magnetic base metals wich are not disolved by nitric acid. Hand pick up halfs with gold base and throw away the rest.
Step 3: with mortar brake the ceramic halfs. Broken ceramic is submerged in HCl. Add nitric in pinches. Every day a pinch off nitric until all gold is disolved. Sifon AR and filter it. Wash the rest of ceramic with water and filter it in AR solution. Now drop gold with SMB, wash it and melt it.
My yield for 17 kg of ceramic IC 's with gold base is 24,75g of :G per 17 kg of start material.
Step 1: al IC's are submerged in hno3. After one month hno3 is replaced with fresh acid. Acid will disolve legs and silicon layer between two halfs of ceramic. This process will last for 2-3 months.
Step 2: after 3 months in hno3 all chips are disolved and splited on two halfs. Wash it with tap water until water becomes clean. Dry leftovers and use strong magnet to clean all magnetic base metals wich are not disolved by nitric acid. Hand pick up halfs with gold base and throw away the rest.
Step 3: with mortar brake the ceramic halfs. Broken ceramic is submerged in HCl. Add nitric in pinches. Every day a pinch off nitric until all gold is disolved. Sifon AR and filter it. Wash the rest of ceramic with water and filter it in AR solution. Now drop gold with SMB, wash it and melt it.
My yield for 17 kg of ceramic IC 's with gold base is 24,75g of :G per 17 kg of start material.