... amount into a boiling tube. Then fill 1/3 with water. When the larger particles have settled to the bottom but the smaller particles are still floating at the top get rid of the dirty water. The sediment from the bottom should now be put onto a microscope slide, on a low magnification a lot of different types of minerals can be seen as they all have different visual characteristics to tell them apart e.g. chalcopyrite - brassy yellow metallic looking. Roasting and leaching Roasting is the process of transforming sulphide minerals into oxides. Sulphide ores are roasted or heated in plenty of air. The sulphide S changes to sulphur dioxide. The metal reacts with oxygen in the air to become a metal-oxide. Heating removes gaseous and other volatile impurities. Leaching is when copper ions are dissolved into solution using a leach solution. Cu2+ + 4NH3 › [Cu(NH3)4]2+ ionic copper + ammonia › ...

See this essay or coursework document in full right now