Nitric Acid 67%
Laboratory / Technical Grade
*Excellent for gold refining
Nitric Acid 67% (42° Baumé) (HNO3) is a highly corrosive mineral acid widely used in various industrial application. It is a clear to pale yellow in color and is a strong oxidizing agent known for its corrosive properties. It is commonly used in chemical manufacturing, metal processing, and as a laboratory reagent.
Nitric Acid plays a key role in refining gold, particularly in methods like aqua regia refining and in parting processes. Urban mining and pcb board gold recovery commonly uses nitric acid to dissolve gold. *Ships in Level 4 Fluorinated Polyethylene Bottles.
Aqua Regia Gold Refining Process (Most Common Use)
Aqua regia is a mixture of nitric acid (HNO₃) and acid (HCl) in a 1:3 ratio. This combination dissolves gold, which neither acid can do alone.
Step-by-step Overview:
Preparation of Aqua Regia:
Mix 1 part nitric acid with 3 parts hydrochloric acid.
Dissolution:
Add impure gold to the aqua regia.
Nitric acid oxidizes the gold to gold ions (Au³⁺).
Hydrochloric acid provides chloride ions (Cl⁻) to form chloroauric acid (HAuCl₄), which is soluble.
Filtration:
Filter the solution to remove impurities and undissolved metals.
Precipitation:
Add a reducing agent like sodium metabisulfite (Na₂S₂O₅) to the solution.
This causes pure gold to precipitate out of solution as fine particles.
Washing & Melting:
Wash the gold powder, dry it, and melt it to form pure gold bars or granules.
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