PRECIPITATE GOLD POWDER FREE
In fact - dropping gold from a "fully" concentrated solution (provided there is no free oxidizer) will cause the gold to drop so fast (due to large particle size) the gold will pile up in the bottom of the beaker & trap gold chloride (dissolved gold) in the gold powder settling in the bottom of the beaker - therefore you need to stir the settling powder up to bring the gold chloride up out of the settling gold to insure all the gold chloride gets reduced to gold There is absolutely no reason why you can't precipitate your gold from a "fully" concentrated solution of AR - provided there is no "free" oxidizer in the solution (free oxidizer is what cause's the gold to not drop) The more dilute the solution is the smaller the particles will be which in turn means slower settling of the particles The more concentrated the solution is the larger the gold "particles" will be when they precipitate which in turn means the better/faster they will settle Gold will precipitate from solution whether it is concentrated - or dilute :!: Same as above but replace urea with sulphamic acidĤ-nitric elemination with iron sulphate (recommended becausr This way will both eleminate the nitric and precipitate the gold)Īfter you eleminate the nitric filter the solution and drop your gold with SMB or iron sulphate Heat your aqua regia for couple minutes until it is warmĪdd urea to the aqua regia, small spoon firstly a strong fizzing will start, wait until its finished then stir slowlyĪdd another small spoon if nitric is still there, strong fizzing will happen again wait until its finished and stir slowly again, repeat those stips until you notice that the fizzing is very weak, there are many videos explaining the nitric elemination by ureaĢ- nitric elemination by sulphamic acid : You can eleminate the nitric using many ways :ġ- nitric elemination by urea : (not recommended) Not a big problem, double the size of you aqua regia solution by tap water because gold loves to precipitate from diluted not concentrated solutions ,
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