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| Electric gold melting furnace | Portable Torch Cutting Welding | Vacuum Filter Kit with Hand Pump | Magnetic Stirrer |
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| pH and Thermometer | Gas Mask | Chemical Protective Clothing | Glove Chemical |
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| Boots | Chemical goggles | Digital Scale 0.001 g | Hot Plate |
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| Alcohol Lamp | Spoon | Glass Stir Sticks | Distilled Water Bottles |
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| Glass Baster | Filtering Flask | Stainless Steel Beaker | Polypropylene Buchner Funnel |
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| Filter Paper | Glass Beakers | Graphite Crucible | Distilled Water |
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| Zinc or Aluminum powder | Sodium or Potassium Cyanide | Borax Gold Melting Flux Granular | Potassium Hydroxide |
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| Stripper SG-9 | Sodium Bisulphite | Nitric acid | Hydrochloric acid |
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| Hydrogen Peroxide |
| Hazardous Chemical |
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THIS IS FOR AN UNVERIFIED APPROXIMATE DEPICTION OF A RECYCLING PROCESS. DO NOT PERFORM AT HOME. |
| Chemical is very dangerous. You should protect in every step. You have to wear gloves, mask or protective clothing when you work. When extracting gold finish, you must clean thoroughly with water immediately and learn all kinds of chemicals that you used and how thoroughly protected. |
| Gold extraction can do several methods. In each method depends on material that you use for extraction. In this case, we use silting; it’s an easy method that you can do it alone. Sill gold extraction is suitable for plated gold such as CPU jewelry and so on. |
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HOW TO EXTRACT GOLD FROM ELECTRONIC SCRAP (CPU) |
| The gold extraction from CPU is melting gold in CPU solution form. It’s very- easy and efficient. We can use the process to apply in gold attraction from metal. |
| BREAKING THE CHIP |
| Smash CPU to break up 2 – 4 pieces for chemical substance melts into CPU |
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Chemical Gold Solvent Extraction 
Ratio Chemical
- Sodium Cyanide NaCN or Potassium cyanide KCN (15 g)
- GOLD STRIPPER SG-9 (15 g)
- Distilled Water (1 L)
Sodium Cyanide NaCN or Potassium cyanide KCN into Distilled Water.
Stir Cyanide and distilled water to mix well for 1 minute
Fill gold stripper SG-9 into distilled water
Stir gold stripper SG-9 and distilled water together
When you stir gold stripper SG-9 and distilled water together, wait it for 5 minute
Fill chemical substance gold extraction that mixed into beaker CPU
The gold in CPU is melted by the chemical substance
If want gold can melt better Use stirring rod stirs in water and CPU
When gold in CPU melts out. Prepare beaker size 2,000 ml for pouring water.
Observe gold in CPU is melt out or not? Loch at the color It becomes white that means the gold melt out, From the writer’s experiment can show the chemical, liter can melt some gold most 25 grams; Gold melt depends on the flaws. If the material has more flaws, gold can less melt. This means, the chemical substance is saturated, It cannot melt more gold.
Pour gold water from the CPU out. You can use distilled water cleanup CPU again. But you must use the least distilled water because we want gold water the most strongest
Water that has gold melt will be dirty. You have to filter as shown below
Fill Hydrogen Peroxide H2O2 20ml per 1000ml melted gold chemical water. Stir it together and wait for 5 minutes.You have to fill Hydrogen Peroxide H2O2 in melted gold chemical water to destroy cyanide chemical structure. So it is not fully element. It cannot melt much gold. If we do not fill Hydrogen Peroxide H2O2 that makes the next step will precipitate. Zinc powder makes gold piece is melted and changed into solution
THIS IS FOR AN UNVERIFIED APPROXIMATE DEPICTION OF A RECYCLING PROCESS.
I HAVE NOT TESTED THIS MYSELF.
DO NOT PERFORM AT HOME.
How to silt
Ratio Chemical
- Potassium Hydroxide KOH 110 grams
- Zinc powder 20 grams
In this gold extraction case, the writer use Zinc powder 20 grams or 4 times of quantity of gold. And hope to have gold 5 grams. The first time, we use Zinc powder 10 grams. The second time, we use Zinc powder 10 grams, Potassium Hydroxide 110 grams Per a liter of water. The first silt, we use Potassium Hydroxide 80 grams. The second silt, we use Potassium Hydroxide 30 grams.
Fill potassium hydroxide 80 grams in gold water.
Stir potassium hydroxide and gold water together.
Wait for 2 minutes.
Fill zinc powder in gold water 10 grams.
Stir zinc powder and gold water together about 30 seconds
Wait for 1-2 minute until zinc powder is dropped. Do not let it for a long times because it make gold stick at zinc powder. Potassium Hydroxide will corrode zinc powder.
Pour gold water slowly, be careful zinc powder flow with water. You can filter only zinc powder
Following image zinc powder and gold water are separated
Fill Potassium Hydroxide 30 grams in gold water
Stir potassium Hydroxide and gold water together
Wait for a minute.
Fill zinc powder 10 grams in gold water.
Stir zinc powder and gold water together about 30 second
Wait for zinc powder drops a few minutes.
Pour water slowly, be careful zinc powder flow out with water or you can filter only zinc powder 
Fill zinc powder that precipitated into the breaker. Then pour distilled water clean again.
How to separate gold from Zinc powder
Ratio Chemical
-Distilled water 500 ml
-Nitric acid HNO3 68% 200 ml
Fill Nitric acid into distilled water. Wait for 2 minutes for chemical substance mixed together
Zinc powder that precipitated gold and Nitric acid mix with ID gold
Fill Nitric acid into Zinc powder but you have to pour slowly because it can react; many bubbles overflow from beaker
Following images, if it reacts sharp, gold dregs will be in the vessel. You can drop little distilled water in beaker
Wait for about 20-30 minutes, Nitric acid corrodes Zinc powder out. “We can observe from bubbles. We fill Nitric acid without mixing with DI 50ml. Added to it and no bubbles. Shown that Nitric acid corrodes Zinc powder out.
Surely that Nitric acid corrodes Zinc powder out. Then pour some Nitric acid out but be careful gold dregs flow with Nitric acid or percolate only gold dregs
Gold dregs and Nitric acid are separated
Fill distilled water in gold dregs at least 500 ml. We fill distilled water to clean Nitric acid that mixed with gold dregs
Wait for gold silts about 20-60 minutes
Prepare beakers for pouring water to clean Nitric acid
Slowly pour the water out. Be careful not to precipitate gold flows into the water.
Following image, if there is some water, some heat can help you for drying. 
Warning: Beaker can break.
Be careful if the heat is too high.
Ratio Chemical
-Nitric acid HNO3 68% 10 ml (or ratio 1:3:5)
-Hydrochloric acid HCL 35% 35 ml
Gold extraction in this process, gold uses to make AR need more purity 75% because if less than 75% purity, the precipitation of sodium sulfite is not incomplete. Gold is gone and water is not pure. AR is increasing the percentage of gold or made of pure gold > 99%
Fill Hydrochloric acid into Nitric acid.
Wait for about 3 minutes, chemical mixed together. This step, you must be careful because the acid is capable of high erosion.
This step is very important. Slowly pour the mixture into the powdered acid gold. Do not put it out, put a golden flood. The acid melts gold 10-15 minutes. Stop until melted. Then slowly added and melt the remaining gold.
Following image; acid cannot melt gold again and gold was melted. We want PH gold to a minimum or high saturated acid. If it has much the acidity, in the next step gold is melt before the solution again.
Following image; gold water is dark yellow.
How to observe gold melt; look at dregs ? If it is brown or coffee color shown as gold dust. Add the acid, leave it about 10-15 minutes. Look at their air bubbles reaction. If gold remain, there will be air bubbles. But if it is grey dregs, it will be Zinc powder. It is not gold. Go to the next step.
Gold was changed into water.
Filter gold water as clean as possible. Gold is a high percentage if it is much clean
Gold water filtration are 2 types.
Water gold flows down. It is natural force of gravity. It is easy. It is fine for simple devices but it takes a very long time > 1 hour. It depends on the amount of water and sediment.
Equipment
-Cotton wool or filter paper
-Filtering flask
-Funnel
Use vacuum air is faster. Disadvantages are expensive and rare. If you do not plug well, polluted sediment will flow out
Equipment
-Tissue or filter paper -Filtering flask
-Air sucker vacuum pump -Rubber tube
-Washer cone filter -Filter funnel
Compare
Air sucker vacuum pumps will filter more sensitive than conventional filter. It depends on the convenience and budget
Wash gold water that attached to the filter paper by using a spray bottle. If gold color changes to white, show that out. (Do not fill much water 3 times of gold water)
Following image; filter paper that no gold water was cleaned by distilled water completely.
Gold water was filter.
Gold precipitated with sodium sulfite
One of technique for higher gold percentage is the cleanness. The vessel must be glass. Water must be distilled water. Gold will be higher than 99%.
Ratio Chemical
- Sodium Bisulfite HaNso3
- Chemical spoon
- Strong percolated gold water
Fill Sodium Bisulfite slowly in gold water. By gradually add in small increments. Do not pour one out because it can be severe reactions. There will be lot of bubbles overflowing
When you fill sodium Bisulfite in gold water, it will change from gold water into brown gold dregs
Warning: Adding much sodium bisulfite in gold water, it makes sodium bisulfite cannot completely dissolved. It precipitated mixed with gold.
Following images; gold dregs are brown lump and they became clearer.
Observing that, gold precipitated out or not? Look at the bubbles. If we fill sodium bisulfite and it has no air bubbles, shown that gold precipitated out. If there are air bubbles, put sodium bisulfite no air bubbles
When gold water stopped on the chemical reaction. Leave at least 15 minutes to precipitated the gold
Slowly pour the water out. Be careful gold dregs flow with water
Pour gold dregs in clean beaker
We will get gold dregs that mixed with Sodium Bisulfite. If the precipitation step, we put too much Sodium Bisulfite, it will see a small white cube beads are mixed. You have to boil distilled water 10-20 times of the amount of gold powder residue.
Fill distilled water in stainless beaker that has gold dregs
Distilled water and gold dregs are in stainless beaker
Boil distilled water with 60-75 Degree Celsius about 15-30 minutes. Do not exceed 80 degree Celsius
Observe from water, it will become white. Wait for 15 minutes for gold dregs
Slowly pour some water. Be careful precipitate gold will flow with water. And observe that, there is Sodium Sulfite; you have to pour the water out. Fill distilled water and boil again. Go to the next step.
Boil with alcohol stove or hot plate to dry. Be careful gold dregs splash if you use high temperatures.
Water will dry slowly
This is dry gold dregs
When the water dries out, slowly pour the gold powder into a crucible
The crucible should be a cone to protect some gold lump spill while melt a lump
Give some heat to gold power but use low heater
Fill little borax for beautiful and shine. Then scoop gold out
Scoop gold out from crucible when it coagulated. Suddenly fill in distilled water. because of if gold lost heat, gold will adhere with the crucible
If you use electric crucible or ceramic crucible, when gold was melt pour into the block
You can use printing block
CPU 1 Kilograms can be gold 5.1 Kilograms
A high percentage of gold is round and glossy. This pure of gold is 99.4% If you want gold cleaner, you can boil with nitric acid about 10-20 minutes
Thumbnails gold extracted
Water used in step 52 and water used in step 48, leave it 50 hours. Gold remaining sediment will settle down. Pour out the water out. Make it dry out gold and bring it into cubes melt
For water the sedimentation of high potassium hydroxide in step 28 it may have some dregs, pour them together for in step 29
Chemical substance for gold extraction
Distilled water is used for gold extraction or the cleanest water that you can find.The best acid-resistant equipment for gold extraction is glass.
THIS IS FOR AN UNVERIFIED APPROXIMATE DEPICTION OF A RECYCLING PROCESS.
I HAVE NOT TESTED THIS MYSELF.
DO NOT PERFORM AT HOME.