Illustration with solution and discussion

A copper converter is charged with 20 tons of matte and blown down to blister copper. Copper grade of the matte is 46%. The flux used carries  4%, FeS 16% and  80%. The slag carries 29% . Assume no loss of copper in slag. Also air is supplied at the rate of 90 .

Calculate:

(a) Total weight of flux and slag produced
(b) The cubic meter of blsat for the entire blow
(c) The blowing time for each of the following stages
(d) Percent  in the gases
(e) Assuming all fluxes added at the start, after how many minutes blowing will the matte contain 60% copper
(f) Heat generated in both the stages.


No loss of copper in slag, Also it must be known that slag consists of FeO and  only. Hence slag composition is 29%  and 71% FeO.

Let X kg is the weight of flux and Y kg is the weight of slag.

From  balance:  0.8X  =  0.29Y

(1)

                  
By solving equations 1 and 2 we get weight of flux = 3807 Kg and that of slag is 10503 Kg.