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The calculation method of high frequency furnace burden
The calculation method of high frequency furnace burden
High frequency furnace burden is calculated as follows:
(1) the changes of high frequency furnace burden calculation of each element in the
A) the carbon content of molten iron charge: C% = 1.8% + 0.5 Ccharge%
Molten iron to the average carbon content of 3.4%, according to the type of C charge is%=3.2%;
B) silicon content of hot metal charging: the needs of theaverage content of silicon of 1.75%, if the silicon melting lossis 15%, then the
Si =1.75/ (1-0.15) =2.06% charge;
C) charge of manganese content hot metal melting loss of known Mn =0.65%, 20%, so the Mn charge =0.65/ (1-0.20) =0.81%;
D) sulphur content of molten iron burden of known S =0.12%,increases the sulfur 50%, are: S =0.12/ (1+0.5) =0.08% charge;
E) charge amount of phosphorus phosphorus no major changes in the melting process, P <0.25% =P hot metal charge
Integrated the above result, the required charge configuration for the average chemical composition:
C charge 3.2%, Si 2.06%, Mn 0.81%, charge charge S charge<0.08%, P charge <0.25%
(2) determine the initial high frequency furnace burden ratio
A) returns ratio: mainly depends on the rejection rate and the rate of finished products, it varies with the specific production. Here 20%.
The new iron and steel scrap ratio b): set the new iron for X%,then scrap as 80%- x%. According to the charge required carbon content is 3.2%, the new pig iron, scrap, scrap the carbon content of each is 4.19%, 0.15%, 3.28%, can list type:
4.19 x +0.15 (80- x) +3.28*20=3.2*100
Obtains x =60.0%. The iron material ratio: Z15 of pig iron,scrap steel, scrap 60% 20% 20%.
(3) high frequency furnace and then according to the proportionand various charge composition, calculation of charge componentssuch as table 3.
Table 3 charge composition
(4) high frequency furnace iron alloy addition amountcalculation
A) adding amount of this lack of silicon content in ferrosilicon0.67%, i.e. 100 kg per 0.67 kg of burden add silicon. Thesilicon content in ferrosilicon is 45%, so every 100 kilograms of charge must add the ferrosilicon weight of 0.67/0.45=1.5 kg
B) calculation ferromanganese added amount of the same method,every 100 kilograms of charge must join with 75% Mnferromanganese: 0.12/0.75=0.16 kg.
(5) high frequency furnace making the list of ingredients
According to the amount of iron ratio and layer, determine thevarious charge for each batch of charge weight, write a list of ingredients. A known layer of iron 500 kilograms, is composed ofeach batch of iron material: pig iron, scrap steel::500*60%=300 kg 500*20%=100 kg, scrap: 500*20%=100 kg, 45% ferrosilicon
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