Do yourself-1

A copper converter treats per charge 10 tons of  matte. Blast is furnished at the rate at of . per minute. Before adding flux a preliminary blow of 9 min is given to produce a magnetite coating, which analyzes as  and unoxidized constituents . Assume that this is entirely corroded by the . The flux carries .

The blister copper is . The converter gases carry no free oxygen.

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.

Answer

a) Weight of coating: 1184 kg. weight of flux and slag 1998.8kg and 6496kg

b) 3788kg,  recovery

c) Slag formation stage; 87.35 minutes and blister  32 minute.

d) Coating stage;

Slag formation stage;

Blister

Illustration –Heat balance

A copper converter is charged with 40 tons of matte whole copper grade is . The flux is . The slag analyses  in flux not as , the blister copper contains

The matte is charged at 1323K, the flux at 298K, and the blast is at 400K. The bath temperature is 1400K. The slag and gases discharge at 1400K.

Specific heat of matte  independent of composition; melting point of matte 1273K; Heat content of liquid matte at melting point

Melting point of slag 1393K and specific heat ; Heat content of liquid slag at melting point . Heat of formation of the slag is 376 kcal per kg of .

In the blister copper formation, bath temperature is 1500K, Heat content of  is  at 1500K.gases discharge at 1500K.Gases discharge at 1400K.

Required: A heat balance of the converter at the end of the slagging period and at the end of the blow