Metallurgy Flashcards
(20 cards)
Chemical formula of bauxite
Al²o³.2H²O
Chemical formula of cryolite
Na³ALF⁶
Define calcination
The ore is heated in the absence of air
Define roasting
The ore is heated in excess of air
What is the function of cryolite used along with Alumina as the electrolyte
Lowers the fusion temperature from 250 degree Celsius to 9050 degree Celsius and enhances conductivity
Why is powder Coke sprinkled on top of the electrolyte
Reduces heat loss by radiation it prevents burning of anode
The most common ore of iron
H a e m a t i t e
For electro refining of copper what is the cathode made up of write the reaction that takes place at the anode
It is made up of pure copper metal
Name the components of brass
Copper and Zinc
Name the main component of duraluminium
Aluminium and copper
Most common ore of the metal aluminium
Bauxite
Name the process by which impure over of aluminium gets purified by using concentrated solution of alkali
B a e y e r s process
Crushing of ove into fine powder name the process
Pulverization
Name the following process of coating zinc on iron
Galvanization
An ore of zinc containing it sulphide
Zinc blend
A metal oxide that can be reduced by hydrogen
Cupric oxide
I use for cryolite
To reduce melting point
One use of fluorospar
Making it a good conductor
Name the solution used to react with Bauxite a first step in obtaining pure Aluminium oxide in the bae y e r s process
Caustic soda NaOH
Name the compound added to cure Alumina to lower the fusion temperature during electrolytic reduction of Alumina
Cryolite
