2Discovery of ChromiumIn 1797, Louis-Nicholas Vauquelin discovered Chromium while experimenting with Siberian red lead.He mixed crocoite with hydrochloric acid (HCl) to yield chromium oxide (CrO3).In 1798, he was surprised to obtain metallic chromium by heating chromium oxide in a charcoal oven because he believed that a method to isolate chromium didn’t exist yet.Today, one can yield chromium by heating the mineral chromite (FeCr2O4) in the presence of silicon or aluminum.
3+ = Discovery of Chromium (cont) Chromite Heated in oven Chromium (with aluminum or silicon)
4Characteristics of Chromium Steel-gray colorLustrousHard metalHigh Melting Point (1907 °C)High Boiling Point (2671 °C )OdorlessTastelessSomewhat MalleableHmmm… Chromium has no taste or smell.
5Sources of Chromium Formed from the ore “Chromite” Found in Zimbabwe, Russia, New Zealand, Turkey, Iran, Albania, Finland, Democratic Republic of Madagascar, and the Phillippines.
6Sources of Chromium (cont) = places Chromite can be found
7Uses of Chromium Chromium is used to: Harden Steel Manufacture Stainless SteelForm Many Useful AlloysProduce a Hard, Beautiful SurfacePrevent CorrosionGives Glass an Emerald Green ColorUsed as a Catalyst.(the refractory industries use Chromite for forming bricks)