hello everybody i hope you are doing
well
in this video i will show you the
complete process of purification and
deposition of gold from dust
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the process shown in this video involves
highly corrosive acids and should only
done outside or in a fume hood
using safety gear such as gloves goggles
and a respirator is mandatory
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therefore we invite you to follow us
until the end to know all the stages so
we will start the process
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roasting roasting this process is
carried out in the presence or absence
of air or other reagents allows the
following almost complete removal of
sulfur from the ore by the formation of
oxides
bring the dirt of the raw and then heat
it on the fire until you see it boil to
get rid of sulfur because sulfur spoils
nitric acid and changes the properties
of aquaragia
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cook the ore at a high temperature in
sulfuric acid at a high concentration of
50 at least for an hour to get rid of
impurities and non-precious metals
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do
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put the oar in a cloth bag that is
sealed from its edges then shake it in
running water and rinse it very well
with sulfuric acid
make sure that the oar is free of the
smell of acid make sure it is completely
clean or just make like me hear
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prepare aqua ragia as it is known nitric
acid and hydrochloride in a 1 to 3 ratio
respectively
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put the ore in a beaker for putting it
on the fire add aqua ragia and leave it
for an hour with good stirring
after leaving the ore in the aqua regia
on a medium heat for an hour or just do
as i make here
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after leaving the raw material in the
aqua regia on a medium heat for an hour
filter it and filter it from the raw
material
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do
repeat the filtering and filtering until
you get a completely clean royal use
cotton or coffee filter to complete the
process
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you have pure aqua regia with dissolved
minerals including gold to neutralize
the nitric by adding urea
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do
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use iron sulfate or use smb or one of
the precipitants you have available or
watch one of our videos to know how to
deposit gold in another way
you have a solution ready for
sedimentation you must be aware that the
precipitant used in the sedimentation
process precipitates all the following
metals in the periodic table of elements
passing through gold
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in the event that the solution is free
of tin chloride and lead chromate you
will have an immediate precipitate in
the solution
in case the solution contains tin
chloride and lead chromate you have a
complex colloidal solution that cannot
be
dry it on the fire until you have a
purple colored paste
pour it in a small amount of
hydrochloric acid it will completely
dissolve and you will have a white
precipitate
get rid of the white precipitate
completely then filter and purify with
acid do not use water at all
take the solution to the fire
dry it completely until it turns 150
degrees
this colloidal paste turns yellow as a
result of transformation tin
ii chloride is soluble in water and the
ternary chloride of gold is converted to
chloride of gold monoxide which is
insoluble in water
go to the yellow precipitate after
heating it on a very low heat and
carefully so that it does not burn then
rinse it very well with alcohol several
times to get rid of tin chloride
do not rinse with water use red or white
alcohol or gasoline after a good rinse
put the yellow precipitate in
hydrochloride acid on a low heat you
will notice the beginning of the
disappearance of the cloud and the
formation of golden precipitate
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channel gold recovery hassan