这是一个老外自己研究的方法： 不想翻译了，想知道的自己看看吧： I am planning to extract gold from the PCB scrap. So I have to strip gold electroplated on the PCB. Like other miner, we are going to use a NaCN solution to strip gold. Some months ago, I had a chance of watching a leaching work by using a NaCN solution in a certain plant. But they also have used a small amount of super strip 100 Shipley manufactured with NaCN. So I'd like to know the function of super strip 100 in a cyanide solution and suitable addition of it versus the amount of NaCN. To my knowledge, modern cyanide plants typically use a cyanide solution of 0.05% NaCN to dissolve gold from the ore. But in the case of leaching gold from the PCB scrap I think the lower concentration will be possible. If someone knows a appropriate concentration of NaCN solution to leach gold from the PCB scrap please let me know about it.
Lim Sun Hee Daeryong enc - Shihungdong, Kumchungu, South Korea
另一个人的法：
YOU CAN STRIP THE GOLD BY REVERSE PLATING i.e., MAKING THE JOB AS ANODE IN AN ELECTROLYTIC SOLUTION OF 90%NaCN , 15%NaOH AND 15% SODIUM META NITRO BENZENE SULPHONATE, AND STAINLESS STEEL AS CATHODE. GOLD WILL DEPOSIT ON CATHODE. JUST PEEL OF THE GOLD AND REFINE IN ACID MIXTURE OF NITRIC OR SULPHURIC ACIDS, OR DISSOLVE IT AQUA REGIA, DILUTE THEN ADD SODIUM META BISULPHITE, PURE GOLD WILL PRECIPITATE AT THE BOTTOM.
Panjala Mukesh - Hyderabad, Andhrapradesh, India
还有！；
Jan 25, 2004
Hello, if using Aqua Regia to process your gold plated computer parts first process your gold plated parts in the Aqua Regia, after process stops pour liquid thru a coffee filter into a 1 gallon pickle jar,when jar is a quarter full of filtered Aqua Regia slowly pour in hot distilled water until half full,then mix a quarter pound of urea 46-0-0 into a quart of hot water and slowly pour into the pickle jar,the acid will boil up so take care and add slowly, when the fizz stops add another once of the urea 46-0-0 and stir, if no more fizz you may now add your sodium metabisulfite to drop out your gold,remember to save your filters for re processing and run your material 2 times,never process a large amount of base metal plated with gold, mix your batches like fingers chips and then pins 50% 30%20% be very careful!!! Aqua Regia can burn or kill you if not respected!!!! I would read about it first or talk to a refiner.
Arnold Hoskins Gold/Platinum,refining - Hamilton, Ohio, U.S.A
看看老外是怎么看U的含金量的！
Currently, 486 and older processors should bring at least a buck each, pentium and newer scrap processors at least .65 each, assorted clean plated pins 15.00 and up per lb, clipped plated connectors at least 12.00/lb. Whole pcb (not clipped or cleaned of pins) should bring at least .60/lb. These are prices selling to a reputable recycler, who will take bulk to a refiner. You won't get the maximum profit this way, but it is safe and pretty easy. If you go to a refinery, you should get higher returns, but bear in mind that there are additional costs and really check out the refinery you will use. In order to make it worth while at a refinery, you should have at least a couple of tons of material (10-15,000 lbs would be best) and you will be expected to provide transportation of the materials to the refinery and, generally, pay between .10 and.50/lb for the refining expenses. The refinery will do an assay or assays of your scrap and will pay you out based on those assays, so your materials should be sorted by the type of material to maximize your profits. Generally, you will be paid for between 90 and 97% of the gold, silver and maybe platinum/palladium depending on the refinery, based on the assay. You have to look for a good refinery, as many are less scrupulous than others. I have found that a refinery usually pays me out based on about 90% of what I would have been able to recover had I done it myself. I figure this is probably due to filter loss and a variety of other factors and not due to their being inherently dishonest, but you should keep these numbers in mind when figuring out what is the best method for you.
怎么提纯呢？
更正：一般使用氰化钾(KCN)溶液泡，便宜。但是这个玩意剧毒，估计不好弄。
王水配方为：3份浓盐酸，1份浓硝酸，按体积算
王水溶解后，生成三氯化金络合物
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