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How Could You Do This To Ores!

How Could You Do This To Ores!. http://classes.mst.edu/ide120/lessons/hardness/materials/st_types.html. Today’s Lesson. Metals in the Ground Extracting Metals from Rocks Design Task Start Ores Formative Task. Metals in the Ground.

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How Could You Do This To Ores!

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  1. How Could You Do This To Ores! http://classes.mst.edu/ide120/lessons/hardness/materials/st_types.html

  2. Today’s Lesson • Metals in the Ground • Extracting Metals from Rocks • Design Task Start • Ores Formative Task

  3. Metals in the Ground • It might be hard to believe, but oxygen (O) and Silicon (Si) make up around 73% of all elements found in the earth or ground. • That means there is not that much left for the 100 or so other elements found on earth. • Many metals, such as Zn, Cu, Ag, Au, Pb, Pl, Hg, Sn, Cr etc are actually quite scarce and are found in very small amounts

  4. Different Ores • An ore is a rock that normally includes a specific amount of a metal that we want for a specific purpose. • Once an ore is found, the metal needs to be removed from the rock itself which requires a lot of energy • Low grade ores are ores with more metal in them than normal, but are uneconomic to mine at the moment

  5. Ore Names!! • Bauxite contains Aluminium • Cassiterite contains Tin • Chalcocite contains Copper • Chalcopyrite contains Copper • Chromite contains Chromium • Cinnabar contains Mercury • Galena contains Lead • Sphalerite contains Lead • Uranitite contains Uranium

  6. Questions • Read Page 74/75 on Metals in the Earth’s Crust and answer Q 1-8. • Hopefully we will be able to look at some ore samples next semester.

  7. Extracting Metal from Ores • Metals can be removed in different ways. These include: • Native metals being removed from other rocks such as Gold from Quartz • Removing Oxygen from the Ore through reduction • Extracting through Electrolysis (Electricity) • Other methods we will learn about soon (but not in IGCSE!!)

  8. Tables & Ores • Notice the table on Page 77, there is a pattern which is quite normal in Science. • The more reactive the metal, the more difficult it is to remove the metal in elemental form. This is why Sodium and Potassium in elemental form are expensive!! • There is also a general trend in cost. The more reactive the metal, the more expensive to extract it from the ore.

  9. OIL RIG • Remember this OIL RIG • OIL is Oxidation is Loss of Electrons • RIG is Reduction is Gain of Electrons • If a metal gains oxygen, electrons are lost or it’s been oxidized. • If a metal loses oxygen, electrons are gained and it’s been reduced. • Redox reactions is when they both occur in the same reaction. You will learn a lot about this next year – not this year.

  10. Questions • Please read Page 76-77 and answer Q 1-5. • When you have finished, have a quick look at the Silver Nitrate and Copper test tubes from last lesson. • Make sure you do not open the test tubes. • Next activity is on next slide.

  11. Removing Metals from Ores • First Choose an Ore from Below: • Bauxite Al2O3 • Chalcopyrite CuFeS2 • Chromite Fe or MgCr2O4 • Galena PbS • Hematite Fe2O3 • Magnetite Fe3O4 • SphaleriteZnS • UraniniteUO2

  12. Answer Following Questions • Using the internet for research – answer the following questions. Not all answers can be found easily: • What is the metal extracted from your ore • How is your metal extracted or removed from your ore? Explain. • What conditions are needed for the rock to form so there is enough of the metal in the ore? • Name some of the major mines that this ore can be found. • How much of the metal is needed for the ore to be economic? • What are some of the environmental impacts or issues associated with extracting the metal from your ore? • What are the major uses for your metal? • How does the mine dispose of the slurry or left over ore?

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