6 replies, 7 voices Last updated by  Culbert 3 months, 2 weeks ago
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  • #3135

    Muntazir Abbas
    Keymaster
    @muntazirgb

    latest technology to separate gold from sand:

    Is there any latest technology to separate gold from sand along the rivers?

  • #3150

    Aiken
    Participant
    @Aiken

    The process involves using different methods to agitate or vibrate or otherwise encourage the heavy gold to separate, sink and concentrate from the original aggregate material. Most methods focus on getting rid of most of the useless material first, then processing the small amount of final concentrate to take the gold from what is left (rather than the earlier phase of eliminating garbage, you take the gold out of the concentrate).

    The difficulty separating gold from raw material stems from the multiple sizes and weights of the material being processed. The material must be processed in a series of classification steps. Trommels, sluice boxes and gold pans all variations of a process where the raw material is first thoroughly washed so that all the smaller material is separated from larger rocks and is trapped. The large rocks and some of the smaller waste is washed away or otherwise removed.

    This gets rid of most of the original material, greater than 90%. The second phase takes the concentrate and more slowly and carefully continues to work it so the gold continues to separate out at the bottom. Gold pans are the individual tool that all self-respecting miners won’t be without and is used mostly for small samples; this tool combines both of these phases. Again, lighter and more easily separated waste material is disposed of.

    Finally comes the last step- separation of the gold from the heavy remaining concentrate. The non-gold components will be mostly “black sand”- not truly sand, actually small bits of iron. Other heavy metals might also be present, such as lead, mercury(often from previous prospecting) and platinum. Sometimes even precious stones such as garnets.

    Gold isn’t often found in sand in large amounts, but when it is there, Gold is very easy to separate from sand because most of the above steps aren’t necessary- the material is all a small uniform size and sand is much lighter than gold. You can use a sluice box, a gold pan or other larger scale equipment, but much faster. All you need to do is ensure you are working the material enough to allow all the gold to get all the way to the bottom, then you can just wash the rest of the material away. No worries about larger material not being thoroughly washed or messing with the hydraulics so gold doesn’t accidentally get thrown away.

  • #3151

    Harry
    Participant
    @harry

    You need to do is discover whether or not the black sand actually has any gold in it. Not all black sands have metallic material, and those that do may or may not have some gold.

    So before you invest in methods of removing gold from black sand, first find out whether there is any gold there in the first place.

  • #3155

    Scott
    Participant
    @scott

    You would first have to dissolve the gold. I think cyanide solutions are used to leach gold out of gold ore, but that’s nasty stuff. So I’d look up Aqua Regia (some mix of nitric and hydroelectric acid) and dissolve the gold with that. Depending on what garbage was in the sand, you could then electroplate the gold out.

    I’m told it’s very important to get the voltage just right, but I don’t know what that voltage would be for your solution. Probably if it’s too low, nothing happens. If it’s too high you get cruddy gold full of pockets of solution, or just a clump of gold mud.

  • #3157

    Jawad Khalid
    Participant
    @Jawad

    Gold is more dense than the sand, so it will settle to the bottom for a pan first. Panning is a bit of an art. Yes, it’s a difficult task, especially if the gold particles are small. If there were a better extraction method, we’d be pulling gold out of seawater, but it’s not practical.

  • #3159

    Alex Jones
    Participant
    @alex

    you can use liquid mercury in wich gold is soluble then you can distill mercury and recovery the gold extracted

  • #3849

    Culbert
    Participant
    @Culbert

    You need to do is discover whether or not the black sand actually has any gold in it. Not all black sands have metallic material, and those that do may or may not have some gold.

    So before you invest in methods of removing gold from black sand, first find out whether there is any gold there in the first place.

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