Welcome to Trinity Gold Recovery! This tutorial details our successful process of extracting 1.86 grams of 99.9% pure gold from a $100 investment in E-Waste scrap. This is the definitive guide to the Two-Stage Aqua Regia Refining Method, prioritizing purity and safety.
Our High-Value Scrap Inventory (The $100 Investment):
We selected high-gold-density scrap, including:
20 Pcs Black Fiber CPUs
20 Pcs Green Plastic/Resin CPUs
8 Pcs RF Bipolar Transistors
5 Pcs Hybrid Integrated Circuits (HIC)
Part 1: Initial Dissolution and Filtration (Aqua Regia)
The goal of this phase is to dissolve all metals (Gold, Copper, Iron, Cobalt) into a liquid solution.
Preparation: Place all scraps into a bucket. Add 500 ml of water, followed by 1200 ml of Hydrochloric Acid (HCl), and then carefully add 400 ml of Nitric Acid ().
Reaction Time: Allow the solution to react for approximately two hours. This time is critical for dissolving the base metals and gold, and allowing the resulting solution to cool.
Coarse Filtration: The solution is filtered through a plastic strainer lined with nonwoven polypropylene fabric into a clean, separate bucket. This removes large solids.
Fine Filtration: The liquid is then meticulously filtered again using a tightly packed cotton ball funnel to catch fine particulate impurities.
Part 2: The First Gold Precipitation
This step recovers the gold, leaving most base metals (Copper, Iron, Cobalt) dissolved in the liquid.
Neutralization: Working in a well-ventilated area, safely add Urea fertilizer (Urea neutralizes the destructive excess Nitric Acid). The solution will bubble (fizz/bubble) until neutralization is complete (no more bubbles are seen).
Precipitation: Dissolve two tablespoons of Sodium Metabisulfite (SMB) in one liter of water and add it to the solution. Add additional water to ensure complete coverage.
Settling: Allow the solution to rest undisturbed for at least 12 hours (overnight). The gold will settle to the bottom as a brown powder.
Decantation: Carefully insert a siphon pipe, keeping the intake 1.5 inches above the settled gold sediment, and siphon the entire acidic solution into a separate waste bucket, ensuring the sediment is not disturbed.
Sediment Collection: Collect the gold sediment onto a 10/12 Micron Medium Speed Whatman Filter Paper. Wash the filter paper thoroughly with ample clean water spray to remove residual SMB and acidic contaminants.
Part 3: The Second Stage Refining (The Purity Leap)
This second stage is the secret to achieving 99.8% purity.
Re-Dissolving: Place the filter paper containing the gold sediment into a beaker. Add 100 ml of Hydrochloric Acid (HCl), followed by 10 ml of Nitric Acid (). Gently stir the solution.
Chloroauric Acid: Allow 20 minutes for the gold to fully re-dissolve, forming Chloroauric Acid (). Check the solution with Stannous Chloride to confirm the gold is present.
Filtration: Add an equal volume of water to the solution. Filter the Chloroauric Acid through a very tightly packed cotton ball funnel into a clean beaker.
Final Neutralization & Precipitation: Neutralize the solution with Urea or add one spoon of SMB dissolved in water. The bright orange-yellow Chloroauric Acid will immediately turn a dark chocolate black/brown.
Final Settling: Leave the solution overnight (at least 12 hours). The pure gold powder will settle, leaving a clear, water-like solution.
Final Decantation: Carefully siphon off the clear acidic solution above the pure gold sediment.
Part 4: Melting and Final Result
Collection & Washing: Collect the pure refined gold onto a clean filter paper. Spray with water six or seven times to remove all acidic residue.
Melting Preparation: Sprinkle Sodium Carbonate (Na2CO3) onto the dry gold powder. Transfer the powder to a crucible.
Melting: Use a gas torch to melt the gold at over 1064°C. The gold powder will melt into a liquid bead.
The Gold Button: Turn off the torch. Sprinkle a small amount of Borax powder over the melted liquid. A shiny, bright gold button will form.
Cleaning: Place the gold button in dilute Sulfuric Acid for about ten minutes to dissolve and remove any clinging Borax or Sodium Carbonate residue.
The Final Proof
This meticulous process yielded 1.86 grams of gold—a high-value return on a $100 scrap investment—with a lab-verified 99.90% purity.
Watch the full video on the Trinity Gold Recovery YouTube Channel!
Video Link Here: Turning $100 E-Waste Scrap into Gold | Will We Make a Profit?
⚠️ SAFETY IS PARAMOUNT: Always use a PAPR respirator and work in a ventilated area. This tutorial is for educational purposes only.
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