Ferrous sulfate can be used to precipitate gold, and can easily be made from soft pure iron, transformer iron laminates is a good source for the iron (normal steel metals will not work as well for the iron source), dilute 10% sulfuric acid to dissolve the iron and make the iron sulfate solution.
Electronic transformers can be used, most of the iron laminates are welded, cutting the weld and separate the iron plates, burn off the oils or any varnish, wash the iron (do this only when you ready to make your sulfate, so the iron will not rust), cut the thin iron plate to smaller pieces so they dissolve in the dilute sulfuric acid easier, the iron will dissolve in the dilute sulfuric acid, a little heat will help the process, this will give you a green solution of iron sulfate, also called copperas, or FeSO4, (what you have read about in Hokes book), after the iron dissolve let the solution sit and settle, decant (pour off liquid without disturbing any solid materials), filter this solution, it can be used as is, or made into crystals with evaporation to drive off the liquid until the iron salt forms.
The green ferrous sulfate crystals, need a few drops of sulfuric acid for storage, and will need to be stored to keep the air from them, keeping them stored under a small amount of the acidic solution in an air tight container, will keep the green copperas crystals from oxidation.
Oxidation of air can change the chemistry of the iron salt turning it white or brown which would no longer be good for precipitating or testing for gold in solution.
These green crystals are easily made from materials most all of us can get, and can be used to precipitate gold from solution, or test for gold in solution.
https://en.wikipedia.org/wiki/Iron%28II%29_sulfate
I have made several more posts on how to make the ferrous sulfate and how to use it, and there are many posts on the forum and in Hokes book on using it, and the tests for gold, a nice thing about ferrous sulfate, unlike stannous chloride in a test for gold, the ferrous sulfate precipitates the gold in the test as brown, then remainder of this solution can be tested further for other metals (PGM) without the gold interfering with the test.
Harold, and many others have made many posts on using ferrous sulfate for testing solutions, well worth searching for and studying.
As far as using gasoline, liquid gasoline does not burn, it is its gas (or fumes) in air or oxygen that burn.
All flammable liquids, or gases can be dangerous, even with burning wood, the wood gases can create explosions and be dangerous if not done or used properly.
I have not used the gasoline burners or furnaces they use in your country, although I would like to make and try one, I see no reason why if properly built and used, they would not be safe and work fairly well for gold or silver or other base metals, but for metals like platinum the carbon from them would be a problem.
Maybe you can help me with learning to build me one of the gas burners?
Electronic transformers can be used, most of the iron laminates are welded, cutting the weld and separate the iron plates, burn off the oils or any varnish, wash the iron (do this only when you ready to make your sulfate, so the iron will not rust), cut the thin iron plate to smaller pieces so they dissolve in the dilute sulfuric acid easier, the iron will dissolve in the dilute sulfuric acid, a little heat will help the process, this will give you a green solution of iron sulfate, also called copperas, or FeSO4, (what you have read about in Hokes book), after the iron dissolve let the solution sit and settle, decant (pour off liquid without disturbing any solid materials), filter this solution, it can be used as is, or made into crystals with evaporation to drive off the liquid until the iron salt forms.
The green ferrous sulfate crystals, need a few drops of sulfuric acid for storage, and will need to be stored to keep the air from them, keeping them stored under a small amount of the acidic solution in an air tight container, will keep the green copperas crystals from oxidation.
Oxidation of air can change the chemistry of the iron salt turning it white or brown which would no longer be good for precipitating or testing for gold in solution.
These green crystals are easily made from materials most all of us can get, and can be used to precipitate gold from solution, or test for gold in solution.
https://en.wikipedia.org/wiki/Iron%28II%29_sulfate
I have made several more posts on how to make the ferrous sulfate and how to use it, and there are many posts on the forum and in Hokes book on using it, and the tests for gold, a nice thing about ferrous sulfate, unlike stannous chloride in a test for gold, the ferrous sulfate precipitates the gold in the test as brown, then remainder of this solution can be tested further for other metals (PGM) without the gold interfering with the test.
Harold, and many others have made many posts on using ferrous sulfate for testing solutions, well worth searching for and studying.
As far as using gasoline, liquid gasoline does not burn, it is its gas (or fumes) in air or oxygen that burn.
All flammable liquids, or gases can be dangerous, even with burning wood, the wood gases can create explosions and be dangerous if not done or used properly.
I have not used the gasoline burners or furnaces they use in your country, although I would like to make and try one, I see no reason why if properly built and used, they would not be safe and work fairly well for gold or silver or other base metals, but for metals like platinum the carbon from them would be a problem.
Maybe you can help me with learning to build me one of the gas burners?
. It's nice to meet you here on the forum. I contacted that supplier already yesterday. Thanks for your post. Are you into refining too? I'm from Baguio City. What do you think about th torch that I use?Maybe you can give me your contact number for us to know each other.
