SULFAMIC ACID 1 lb. Bag

SULFAMIC ACID 99.95%+ purity.
5329-14-6. H3NSO3
Additional details about sulfamic acid:
Other names: Sulfamic acid is also known as amidosulfonic acid, amidosulfuric acid, aminosulfonic acid, and sulfamidic acid.

Appearance: It is a colorless, crystalline solid.
Uses: Sulfamic acid is used in a variety of applications, including as a descaling and cleaning agent, in metalworking, in dye and pigment manufacturing, and as a catalyst in chemical reactions.

Sulfamic acid is used in gold refining primarily for removing excess nitric acid from aqua regia solutions.
Here's how it works:
Aqua Regia: Aqua regia, a mixture of nitric acid and hydrochloric acid, is used to dissolve gold. However, after the gold is dissolved, the excess nitric acid must be removed.
Neutralization: Sulfamic acid reacts with nitric acid to neutralize it and remove it from the solution. This is often referred to as "denoxing" the solution.
Facilitating Gold Precipitation: By removing excess nitric acid, sulfamic acid helps create conditions that are favorable for precipitating the gold out of the solution, usually using a reducing agent like sodium metabisulfite (SMB).
In summary, sulfamic acid isn't directly involved in dissolving gold but plays a crucial role in the post-dissolution steps by removing nitric acid and making gold precipitation possible.