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Ekstraksi Precious Metals

1) The document discusses using hydrogen peroxide as an oxidizer for leaching and extracting gold, platinum, and palladium from crushed gold rocks and ores. 2) Hydrogen peroxide has advantages over aqua regia in that it does not dissolve unwanted minerals or require additional steps to neutralize nitric acid before recovering metals. 3) A hydrogen peroxide and hydrochloric acid leach can leach these precious metals at room temperature without heating, keeping gold recovery costs low. It also produces fewer harmful gases than other leaching formulas.

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132 views1 page

Ekstraksi Precious Metals

1) The document discusses using hydrogen peroxide as an oxidizer for leaching and extracting gold, platinum, and palladium from crushed gold rocks and ores. 2) Hydrogen peroxide has advantages over aqua regia in that it does not dissolve unwanted minerals or require additional steps to neutralize nitric acid before recovering metals. 3) A hydrogen peroxide and hydrochloric acid leach can leach these precious metals at room temperature without heating, keeping gold recovery costs low. It also produces fewer harmful gases than other leaching formulas.

Uploaded by

jaylani99
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EKSTRAKSI PRECIOUS METAL/ PLATINUM, GOLD, COPPER ETC

TES KANDUNGAN BATU

Leaching Gold Rocks using Hydrogen Peroxide


Gold extraction from natural gold sources, including gold ores & gold rocks, can be done by
leaching the crushed gold rocks or gold concentrate, in a solution of hydrochloric acid and an
oxidizer. There are a number of oxidizers that can be used to put the gold in solution. For
example, as previously discussed in our article titled Refining Gold with Aqua Regia, nitric
acid was used as the oxidizer to extract gold and other precious metals from natural gold rocks,
computer scrap and old jewelry. Aqua Regia however, with its nitric acid, has some
disadvantages when leaching gold ore. The nitric acid in aqua regia tends to dissolve many
unwanted minerals and other contaminants which can cause problems when it comes time for the
precipitation of gold, platinum and palladium. Leaching gold with aqua regia also requires
additional steps to neutralize the nitric acid before recovering the gold, especially when the gold
is recovered with ion exchange resins or the precipitation method.

This article will discuss an improved gold leaching formula that uses hydrogen peroxide as the
oxidizer to leach and then recover gold, platinum and palladium. Using hydrogen peroxide, or
H2O2, has many advantages over Aqua Regia, both durring the gold leaching process and
durring the gold recovery and gold separation phase. A hydrogen peroxide gold leach is useful
with the newer advanced gold recovery methods, such as Solvent Extraction and the use of ion
exchange resins because there is no Nitric Acid that needs to be neutralized first.

Hydrogen Peroxide Gold Leach Formula


Concentrted H2O2 and HCL are used to create a powerful gold and precious metal leach, with
the H2O2 being slowly added over a period of time. Depennnding on the makeup of the gold
rocks or gold ore being leached, the H2O2 & HCL ratio can be as low as 1:10
One advantage that the H2O2 gold leach has over other gold leaching formulas is that this gold
leach will leach gold, platinum and palladium and do it at room temperature. No heating is
required. This helps to keep the gold recovery costs at a minimum.

The hydrogen peroxide / HCL gold leaching formula also produces fewer NOX gasses.
Dangerous chlorine and other gasses are still produced however, and a fumed hood and
appropriate sized scrubber need to be used when using this leach as with all other chlorine based
leaches.

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