Illustration: Matte charging in stages:

In copper converter the first charge is 30 tons of  matte. The flux analysesand . The slag analysis is. After the first slag is poured additional matte is charged whose amount equals to oxidisedfrom the first charge. Assume all  which is not as is as . The blister copper is pure copper. Air is supplied at .


Calculate

a) Weight of flux and slag and blister copper

b) Air for the entire operation

c) The time for i) first and ii) second slagging period and iii) for blister copper period.

Let

balance:

(1)

balance (1^st stage).

(2)

balance (2^nd stage).

(3)

By solving we get.

.

Copper balance gives weight of blister

Slag forming stage is in two stages. One has to calculate moles of oxygen for first stage and second stage. The reactions are