Gold Recovery from Gold Rocks and Ore
Leaching Gold Rocks using Hydrogen PeroxideGold 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.