The gold-containing element is platinum-rhodium alloy; Thermocouple; Ternary platinum net; Platinum mesh ash; Nitric acid oxidation furnace ash; Palladium recovery network; K gold; Gold and platinum spinneret; Platinum-iridium alloy; Palladium-iridium alloy; Gold-palladium catalyst; Alloy crucible; Silver palladium slurry and various wastes, etc.

Gold is a metallic element, its chemical symbol is Au, and its atomic number is 79. Simple substance (free form), commonly known as gold, is a popular precious metal, which has been used as currency, preservation and jewelry for many centuries. In nature, gold exists in the form of simple substance in gold nuggets or rocks, underground veins and alluvium. Gold is also one of the currency metals. Gold, a simple substance, is solid at room temperature, with high density, softness, brightness, corrosion resistance and the highest ductility and ductility among known metals.