The refined gold - pictures provided by Nankai University student Dianwu Li. On Renren.com, a total of 19 photos were posted, 13 of which were close-ups of small golden beads. From the first picture showing two CPUs to the fourth "mysterious potion appears," and then to the seventh picture "4 golden beads, what to eat to increase breast size after childbirth... one was lost due to my sneeze..." The pictures live-streamed the process of netizen "Lao Wu" extracting small golden beads from CPUs. Finally, "Lao Wu" happily posted the results of his analysis and identification using the school's spectrometry equipment on three golden beads: "Three golden beads, ICP-AES analysis shows over 99.99%, no impurity peaks of other elements." On Renren.com and Sina Weibo, there is a more detailed and intuitive set of pictures clearly demonstrating "Lao Wu's fierce thiourea gold extraction technique."
"Lao Wu" is actually a senior student in the Chemistry Department of Nankai University's School of Chemistry, named Dianwu Li. When asked why he thought of the "thiourea gold extraction technique," "Lao Wu" said his idea was simple: it seemed wasteful to sell electronic products directly as goods by weight. In extracurricular social practice, "Lao Wu" worked as a technical advisor for a counterfeit acquisition company and came into contact with many methods of precious metal recycling. As for this experiment, "Lao Wu" emphasized repeatedly that this method is non-toxic, high-purity, low-cost, and the technology is already very mature; it is not the so-called "aqua regia method." "Lao Wu" said he completed the experiment in mid-November, "this experiment only takes one day to complete."
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Chemistry Doctor:
Regarding this, a chemistry doctor told reporters that from the steps involved, this method is feasible in laboratory operations. However, if you want to try this method for an experiment, there should be experienced chemical professionals guiding you, and environmental protection must be taken seriously.
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Regarding "Lao Wu's" alchemy, although many netizens have expressed amazement at finding a "path to wealth," others have questioned whether it is labor-intensive and time-consuming, while some are concerned about the high cost and environmental pollution of "primitive methods," since "there isn't as much metal in today's CPUs as there used to be, and ultimately, it doesn't really make much profit."
Ten Steps:
"Lao Wu" said he used this method to extract 4 small golden beads from 5 CPUs, one of which he accidentally lost.
Netizen Doubts:
Operation requires professional guidance
Senior Student's Fierce Gold Extraction Technique
5 CPUs Extracted Into 4 Small Golden Beads
Gold mining from waste, this is not a myth! A senior student from Nankai University's School of Chemistry successfully extracted gold from old computer CPUs. Recently, a set of pictures titled "Lao Wu's CPU Gold Extraction is a Piece of Cake" spread online, drawing exclamations from netizens.
"Lao Wu's" thiourea gold extraction technique consists of ten steps. The first step is instrument preparation, requiring items such as beakers, glass rods, and muffle furnaces; the second step is reagent preparation, specifically thiourea, sulfuric acid, hydrogen peroxide, etc.; the third step is CPU preparation, "the gold content in CPUs varies, but older 486, 586 computers have relatively higher gold content"; the fourth step is soaking, first cleaning the CPU with clean water, removing thermal silicone grease, etc., then submerging the CPU in water, adjusting the pH value of dilute sulfuric acid to around 1.5, adding 5 ml of 30% hydrogen peroxide, 1 gram of thiourea (preferably made into a solution), the order cannot be reversed; the fifth step is adsorption with activated carbon; the sixth step is high-temperature heating, the temperature must not be lower than 1000℃, once the activated carbon has been thoroughly oxidized by high-temperature air, the remaining material is a silver-gold-copper alloy; the seventh step is boiling the alloy slightly with distilled water and pure nitric acid, filtering directly, washing repeatedly with water, and the crude gold will appear; the eighth step is purification, approximately taking one hour; the ninth and tenth steps involve melting the gold using a muffle furnace and testing its purity with instruments.
Too High Costs and Environmental Pollution