other extraction methods

Question 1

what is leaching?

Answer 1

dissolving ore with chemicals
solution formed is treated so metals precipitate from solution

Question 2

what are the other methods of metal extraction?

Answer 2

leaching
electrolysis

Question 3

what are other methods of refining metals?

Answer 3

electric furnaces
electrolytic refining

Question 4

what happens in electric furnaces?

Answer 4

metal heated by electricity

Question 5

what sort of material do we use in electric furnaces and why?

Answer 5

best grade steels
large cost

Question 6

what are the most important electric furnaces?

Answer 6

arc furnace
induction furnaces

Question 7

what happens in an induction furnace?

Answer 7

alternating current used

Question 8

what is electrolytic refining based on?

Answer 8

electrolysis

Question 9

what happens to the product after electrolytic refining?

Answer 9

pure metal from anode is deposited on cathode

Question 10

what is the ore for aluminium?

Answer 10

bauxite

Question 11

what do we do to bauxite after mining?

Answer 11

react with NaOH
settling and filtering
precipitation
calcination
smelting

Question 12

how is molten metal shaped?

Answer 12

casting

Question 13

how is solid hot metal shaped?

Answer 13

forging or rolling or drawing

Question 14

what affects how a metal can be shaped?

Answer 14

ductility
malleability
brittleness

Question 15

what is casting?

Answer 15

molten metal poured in a mould and cooled

Question 16

what are moulds made of?

Answer 16

sand or metal

Question 17

what is formed in casting?

Answer 17

ingots

Question 18

what happens to ingots after casting?

Answer 18

heated in a soaking pits

Question 19

what does continuous casting produce?

Answer 19

simple shapes

Question 20

when do we use rolling?

Answer 20

for metals that are required in sheet form

Question 21

what is extrusion used for?

Answer 21

making rods and tubes

Question 22

what is drawing used for?

Answer 22

thin rods

Question 23

what happens in powder metallurgy?

Answer 23

powdered metal is put into a die to give it required shape