More Metal Extraction Flashcards
How is iron extracted?
Reduced in blast furnace
What happens to carbon in the reduction of iron oxide?
Carbon displaces iron
Undergoes oxidisation
What is the role of limestone in the extraction of copper?
To react with acidic impurities
What is the purpose of cryolite?
To dissolve aluminium as its melting point is high
What is bauxite?
Aluminium ore
How are aluminium ions reduced?
They gain electrons at the cathode
Why is electrolysis so expensive?
Lots of energy used
Oxygen may react with anode (replacement needed)
What is the difference between the positive and negative electrodes in copper electrolysis?
Anode (+) = impure copper
Cathode (-) = pure copper
What electrolyte is used in copper electrolysis?
Copper sulfate solution
How may copper be extracted?
Electrolysis
Bioleaching
Phytomining
What are the issues with bioleaching?
Energy efficient but slow
What are the issues with phytomining?
Relies on weather
Alters ecology of land
Why is titanium so expensive to extract?
Several steps
Uses up magnesium/sodium
Why isn’t titanium extracted by electrolysis?
Titanium chloride doesn’t conduct electricity
What is rutile?
Titanium ore
