chemical washing that separate gold from sand

how to use bleach on gold ore to remove gold | sciencing

how to use bleach on gold ore to remove gold | sciencing

Gold is an almost non-reactive metal, but halogens chlorine, bromine, fluorine and iodine can dissolve it. Chlorine is the cheapest and lightest product that can achieve this. Bleach is the chemical compound sodium hypochlorite. When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore. This was the first commercial method used for gold extraction.

Add the 35-percent hydrochloric acid to the sodium hypochlorite bleach into a flask or beaker, in a two-to-one ratio of acid to bleach. Ensure that the liquid mixture is at least six times the volume of the ore grains. Wear a face mask and avoid breathing the chlorine fumes the reaction produces.

Pour the acid-and-bleach mixture into the plastic bowl with the ore grains and stir. Allow four hours for the gold to dissolve, stirring every 20 minutes. The chlorine reacts with the gold inside the ore to form gold chloride. Filter the ore and bleach solution to remove all the impurities, such as soil and rock fragments. Collect the filtered gold chloride solution in a flask.

Place powdered sodium metabisulfate in another flask and dissolve with water. This forms a solution of sodium bisulfate. Add the sodium bisulfate solution to the gold chloride solution. Leave it to settle for four hours.

Observe the brown powder at the bottom of the flask. This is the gold that has precipitated out of the solution. Pour off the solution. Place the flask with the wet gold powder on the stove and evaporate the water, leaving the gold powder at the bottom.

Collect the powder into a crucible or melting dish. Apply heat with an oxy-butane torch from the side of the dish toward the center, so that the powder melts at 1,947 degrees Fahrenheit. Remove the heat when the gold has melted completely and allow it to cool. Once cooled, the gold is ready for fashioning into ornaments.

Based in London, Maria Kielmas worked in earthquake engineering and international petroleum exploration before entering journalism in 1986. She has written for the "Financial Times," "Barron's," "Christian Science Monitor," and "Rheinischer Merkur" as well as specialist publications on the energy and financial industries and the European, Middle Eastern, African, Asian and Latin American regions. She has a Bachelor of Science in physics and geology from Manchester University and a Master of Science in marine geotechnics from the University of Wales School of Ocean Sciences.

how do you separate gold from other substances

how do you separate gold from other substances

3). You can put everything into a solvent that dissolves gold without dissolving the other substances, and throw away what isn't dissolved. But this one my be tough or impossible since gold is hard to dissolve and many other materials dissolve easily.

Q. I'm doing an assignment for school and I am confused. When gold panning what are : - the raw materials - the wastes - the products - chemical or physical properties; the last one I do not understand please help me.

A. Hi, Sophia. "Gold panning" is often done in streams or lakes and consists of filling a pan with water and some of the gravel or sediment, and sloshing it until the lighter particles wash over the rim with the water, and only the densest particles remain in the pan. The central idea being that since gold is so heavy, if you execute the maneuver with some skill and experience, any gold that was there will be the last thing left. Look up 'gold panning' on if this wasn't clear. Now that you know what gold panning is, I think you be able to answer all of the questions you presented. If you can't, then please re-read your textbook where it explains physical vs. chemical properties. But, in general, physical properties are things you measure with physical devices, like weight which is measurable with a scale. Good luck.

sophia your rew materials are what you started with a pan not included but falls under the category the dirt and water your product is the gold and the waste is not the gold anything you would not keep is waste accept the pan that doesnt even get considered but it would be a raw material to me dont read the text book that doesnt help in real life

Hi, Danni. Thanks! But I don't agree with advising Sophia to not read her textbook. Textbooks are not only a great source of tutorial learning and specific information, but reading books can be a great aid to learning how to clearly express your thoughts. You may not yet see why being able to clearly express your thoughts is important in real life, but you'll surely find out :-)

A. I'm not sure that algae will be a problem unless it is a type that really adheres to gravel instead of washing away. Whether the "other things" would be a problem probably depends on what they are, Julie Ann. Are you sure that you clearly understand the question and you've carefully thought about how gold panning works?

A. Hi Martin. I already answered that question on this page. If what I said wasn't clear to you, please try to phrase your question in terms of the answers already offered. Thanks. Regards, Ted Mooney, P.E. Striving to live Aloha - Pine Beach, New Jersey ^

I want to dissolve other substances that are in the gold. I require only gold. So tell me please which acid I use for this purpose. Nitric acid or something more...? I shall be thankful to you; waiting for your response.

A. Hi, Allama Well, if you want to dissolve those other substances, you need to know what they are before you can choose something that will dissolve them; but yes, nitric acid is both a powerful acid and a powerful oxidizer, so it does dissolve a lot of things including most metal. Good luck. Regards,

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a poor man's method of smelting gold | sciencing

a poor man's method of smelting gold | sciencing

Smelting gold usually involves high-tech and high-cost tools to perform. Mostly, mining companies do the procedure, which sees one material bonded to or released from another in the presence of extreme heat. However, prospectors, and people at home, can smelt their old gold using some simple steps. All it requires is access to a few common minerals and compounds, and a high heat source.

To cheaply smelt your own gold you need to have access to a high temperature furnace. For a do-it-yourselfer this shouldn't pose a huge challenge. The first thing to do is determine the amount of gold to smelt. This will inform the size of the furnace. Small tin coffee cans or large trash cans make for good starting points in this regard.

Once you have your can, cut a small hole in the side to allow in a metal pipe. Install a mesh grate halfway up the can solder this in place or hold it up with metal legs; your charcoal will rest on this. Dig out a hole in the ground twice as big as the can. Place the can in the middle and surround it with firebrick and clay. Connect a hair dryer to the open end of your metal pipe use duct tape if necessary to close up any gaps.

You can remove the most common metals found in gold ore (copper, zinc and lead) using elements that bond with oxygen at lower temperatures than gold. This oxidation process will make copper oxide, zinc oxide and lead oxide all of which are less dense than pure gold and will float to the top of your crucible allowing the slag to be sloughed off.

Sodium nitrate, silica, and sulphuric acid cause this reaction. All of these are easily attainable at a hardware store, or you could use household items such as borax and broken beer bottles to replace the first two. You will need to contact a chemical supplier to obtain the acid.

Load the solid gold ore into your crucible then load the furnace with charcoal. Light the charcoal and let it ash over. Set the crucible directly on the charcoal. Load more charcoal around the crucible. Turn the hair dryer on low to force air into the chamber below the charcoal. If the temperature fails to get high enough to melt your ore, turn the hair dryer up to high. Be very careful not to get the charcoal so hot that it causes the ore to liquefy and then bubble. Extremely high temperatures can cause the crucible to crack or even explode.

Once the liquid starts to swirl in the crucible, add the oxidizing agents. This will cause the lead, copper, or zinc in the mixture to come to the top. Pour off the slag into a heat resistant container. The liquid will be too thick to pour once it is cold. Add in some borax to thin out the liquid. When the liquid cools, chip off the glass which will have floated to the top during the cooling process and there is your gold, smelted to perfection.

When you pour the liquid gold out of the crucible you probably don't want it to end up in some misshapen glob on the ground so you need to have a casting dish. Any cast iron vessel will do, or you could create your own special design using a delft casting method. This method incorporates simple clay sand casting with precision design including pouring channels. The compact nature of the sand doesn't allow the liquid gold to push its way down and thus it pools and cools in the cast.

how to use mercury to recover gold

how to use mercury to recover gold

To recover the mercury in solution (see step 8), simply drop some aluminum foil into the acid solution. A chemical reaction takes place and the acid solution will drop the mercury to attack the aluminum. This causes the mercury to revert to its natural liquid metal form at the bottom of the jar. Then rinse out the acid solution and you will be left with most of your original mercury.

After mercury has been used a number of times in the process of amalgamation, it becomes dirty and tends to break down into smaller, separate balls instead of it all-coming together into a single mass. To clean dirty mercury, you simply bathe it in a nitric acid solution of 30 parts of water to 1 part of acid. This will clean the impurities out and allow it to amalgamate properly again. Mercury can be used over and over to amalgamate and cleaned when necessary in this way.

using borax flux to refine gold - manhattan gold & silver

using borax flux to refine gold - manhattan gold & silver

When most people hear borax they think about laundry. But at Manhattan Gold & Silver, we think about gold refining. Thats because this mineral does more than wash clothes its an important flux in metallurgy for separating gold from slag.

Youve probably seen borax in the detergent aisle, but it has several uses spanning multiple industries. Not only is borax a detergent, but its also used to make water softeners, buffering agents, anti-fungal products and much more. It also plays an important role during the gold refining process as a flux.

In metal refining, a flux is sort of like a cleaning agent because it helps remove impurities from a sample. With some borax, heat, and a little know-how, its possible to extract pure gold from a sample of ore. This is because using borax as the flux reduces the melting point of all the elements in a piece of ore, including gold.

While out in the field, a gold prospector can grind and wash a piece of ore, then mix it with borax in a plastic bag. The bag is then placed in a bowl or crucible and heated. The heating action is what triggers the borax to go to work. Once the borax melts, it lowers the melting temperatures of everything in the ore. As all of the minerals melt down, they separate from one another. As the process continues, the borax causes the other minerals to oxidize and breakdown even further. Gold is unaffected by this reaction and sinks to the bottom of the mixture, intact.

The mixture of oxidized impurities and flux becomes slag, which is scraped away to reveal the pure gold at the bottom of the crucible. Because borax is so cheap and effective at extracting gold, borax-based refining techniques were very popular during the 19th century gold rushes. It still continues today among individual prospectors and small-scale mining operations.

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