In terms of purity, rarity and durability, platinum can be used instead, which is an ideal material for making jewelry and inlaid gems. Palladium, together with platinum, gold and silver, is one of the international precious metal spot and futures trading varieties, which was once higher than platinum in history.
Extended data
1803, British chemist wollaston discovered a new element from platinum ore. He dissolved the natural platinum ore in aqua regia, removed the acid, and added the solution of mercury cyanide (Hg(CN)2) dropwise to obtain a yellow precipitate. Sulfur, borax and this precipitate are heated together to obtain bright metal particles. He called it palladium (palladium), and the symbol of the element was Pd. The name comes from 1802, a newly discovered solar asteroid, ParaAthena, in memory of Athena, the goddess of wisdom in ancient Greek mythology.
Palladium is rare on the earth, and it is difficult to mine and smelt, which belongs to the series of rare and precious metals. The content of palladium in the earth's crust is about11×109, even only platinum 1/6, and the total annual output is less than 8% of gold. And only a few countries in the world, such as North America, Russia and South Africa, produce it. Palladium is often dispersed with other platinum group elements in alluvial deposits and placers (such as primary platinum ore, nickel-copper sulfide ore, nickel pyrite, etc.). ).