Metallurgy Flashcards
Definition of Minerals
The naturally occurring compounds of metals which are generally mixed with other matter such as soil, sand, limestone and rocks are known as minerals.
Definition Ores
The minerals from which metals are extracted commercially at a comparatively low cost and with minimum effort are called ores.
Ores of Iron
Hematite, Magnetite
Ores of Aluminium
Bauxite, Cryolite
Ores of Zinc
Zinc blende, Calamine
Definition of Metallurgy
It is a process of extraction of metal from its ores.
Meaning of Gangue
It is an earthy impurity
Steps involved in Metallurgy
1) Dressing of an ore
2) Conversion of ore to oxide
3) Reduction of oxide
4) Refining of Metals
Categories under Dressing of ore
1) Magnetic Separation
2) Froth Floatation
3) Gravity Separation or Hrydrolytic method
4) Chemical process
______ elements are extracted from their oxides by electrolytic reduction.
K, Na, Ca, Mg & Al
_______ elements are extracted from their oxides by using reducing agent.
Zn, Fe. Pb, Cu
______ elements are extracted from their oxides by thermal decomposition
Hg & Ag
_____ elements are available in free state.
Pt & Au
Dressing of bauxite ore is done by ______
Baeyer’s Process
_____ chemical is used to react with Bauxite ore in Baeyer’s process
Hot & Conc NaOH
