Required:

a) The weight of magnetite coating produced, flux required and slag made.

b) The weight of blister copper, and the % of copper recovery

c) The blowing time of each stage.

d) The volume and % composition of the converter gases.

13) A cupola melts per hour 15 tons  of pig iron of composition  of scrap containing. C 3.5%, Si 2.2% Mn 0.8% and PO.7%, and 5 ton of scarp containing C 3,%, Si1.8% Mn 1.1% and P O.2%.

The dry air used is  measured at 313K  to melt 1ton of pig iron and scrap per minute.

During melting 20%  of total Si  charged, 15% of total Mn  charged 1%  of total Fe  charged and 5%  of C is oxidized,19%  of carbon of coke is absorbed by iron during milting. Enough  is charged to give 30% CaO in slag. The coke is 92% C and 8% SiO₂ and weight of coke is 1/9  of the total weight of pig iron and scrap.

Required:

a) Charge balances of cupola for 5 hr run.

b) The % composition of resulting cast iron, slag and gases.

 
14) A plant treats 210 tonnes of material in a shift of metal grade 40%  and tailing has metal grade 0.2% . Calculate mass of concentrate and tailing.

15) A roasted lead ore is smelted in a blast furnace with enough  to make a slag of 18.5% CaO .The coke is 16% of the roasted ore and analyzes 90% C  and . The composition of roasted ore;. Of the lead charged 5% is lost in dust andflue, and 8% enters the matte. Of the copper charged 50 % enters the matte and rest copper enters into lead bullion .Ten % of S enters into gases.

Find: Per 1000Kg roasted ore

The amounts of lead bullion, matte and