crushing a small ore sample to recover the gold buried inside. this sample was found in a lode vein in marion county oregon. the ore is heavily laden with copper and pyrite along side of quartz.
objective of this first chemical bath is to remove a large majority the base metals such as nickle zinc and copper. after cleanly removing your plated sections of computer parts. remove any visible capacitors transistors or other components. be sure to also remove any steel or iron parts attached.
how to use bleach on gold ore to remove gold. 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 zinc causes a chemical reaction which separates the gold from the ore. the gold is then removed from the solution with a filter press. for the carbon-in-pulp method the ground ore is mixed with water before cyanide is added. then carbon is added to bond with the gold.
you can't actually melt gold from rocks; if you hold a rock over a flame hot enough to melt gold and expect the gold to dribble out you're going to be disappointed. the process of extracting gold from ore is a multistep one and historically it has involved the use of some dangerous chemicals including cyanide and mercury.
so as you are crushing stop and screen your material removing any free gold which has already separated from the rock during your crushing that won't go through your screen with your fingers. the coarser rock that won't go through your screen can then be returned to the crusher for further work to break it down
remove gold from ore. crush and mill the gold ore to dust like particles. ore is put into the crusher which breaks it up. water is added during the process which when mixed to the ore particles creates a pulp. the ore in the pulp is then ground into smaller particles and pulverized into a ball mill.
addition of lime to the ore and cyanide solution to the slurry to leach the gold and silver into solution addition of carbon to adsorb attach dissolved metals and remove them from the slurry stripping the metals from the carbon by acid washing and circulation of a caustic cyanide solution
gravity concentration tends to recover the pyrite with the gold and only removes the lighter minerals such as quartz from the ore. the most difficult particles to gravity concentrate are the fines and 75 microns to 2 microns are definitely very fine. so even if the ore were ground to 2 microns it may not be recoverable using current gravity technology. that appears to leave froth flotation as still the best method of recovering the gold from pyritic ores.
this is a concern because arsenic is actually very common in many gold ores. selenium mercury and other toxic elements are also found in many high sulfide gold and silver ores as well. to roast sulfide ores it takes a good red heat and a good amount of air but not too hot as you don't want to melt them.
to test the solution for remaining gold first immerse the end of the stirring rod in the acid. remove it and touch that end to a paper towel to make a wet spot. put a drop of gold detection liquid on the wet spot on the paper towel. if any gold is still dissolved in the acid the wet spot will turn a purple-black or a purple-brown.