METALS

METALS

1. How Metals are obtained

   • Metals come from minerals that are parts of rocks
     • Mining is carried out in surface mines or underground mines
       • The ore and gangue be separated
         • Make metal from the ore

2. Classifying

   • Ferrous metals
     • Main component is iron
     • heavy metals
       • bronze
         • zinc
     • Ultra light metals
       • magnesium
     • light metals
       • aluminum
         • titanium
   • Non-ferrous metals
     • Main component is not iron
     • Pure iron
     • cast iron
     • steel
       • steel-making process
         • iron mineral is washed
           • Is crushed and sleved
             • The ore is mixed with coke and limestone
               • Slag is obtained
                 • Quending
                   • Tempering

3. Properties

   • good electrical thermal and acoustic conductors
   • ductile and malleable
   • are tough
   • melt at high temperatures
   • expand and contract
   • some are magnetic
   • most rust
   • can be recycled and reuse
   • some are toxic

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