Fergana polytechnic insitute mechanical engineering faculty department of mechanical engineering and automation

PRACTICAL EXERCISES ACCORDING TO THE SYLABBUS OF THE 
SUBJECT “MATERIAL SCIENCE” 
Practical exercise-1 
Calculation of blast furnace slag materials. 
Purpose of the work: 
study of calculation of blast furnace slag materials. 
Theoretical information 
Blast furnace ironmaking is the process of smelting iron ore (including natural 
ore and artificial enrichment) into pig iron. Blast furnace ironmaking plant is an 
important part of iron and steel enterprise and an independent factory of ironmaking 
production. The main products are steel making and cast iron.The blast furnace 
ironworks of steel mills are mainly engaged in the production of pig iron, while 
independent ironworks usually produce iron according to actual needs. 
This design is a five-stage blast furnace type, and a simplified internal model 
is shown in Fig 1. h1: height of hearth; h2: height of furnace abdomen; h3: height of 
furnace waist ; h4: height of furnace body; h5: height of furnace throat. 
 
Fig. 1 Schematic diagram of furnace profile 
It is determined by the diameter of furnace cylinder, the Angle of furnace 
waist blast furnace and furnace waist, etc., and the permeability of slag is 

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100 
proportional to the diameter of furnace waist. The empirical formula is: 
D=
0.5684 
Vu
0.3942=0.5684×30000.3942=12.981 m, then the value of 
D 
can be used as 13.0 
m. 
(3) Diameter of furnace throat. 
d
1
=
0.431
Vu
0.377=0.4317×30000.377=8.769 m, 
then 
the 
value 
of 
d
1 
can 
be 
used 
as 
8.8 
m. 
(4) Height of hearth.
It is required to be able to store the amount of primary iron and primary slag. 
h1=
1.4206
Vu
0.159-34.8707
Vu
0.841=5.004 m, then the value of 
h
1 can be used as 
5.0m.
(5) Belly height 
The furnace burden in the furnace decreased slowly, and the unrestored ore 
was completely restored and entered into the furnace abdomen. The furnace 
abdomen was slightly higher during pig iron smelting, making the ore more 
responsive. 
h
2=(1.6818
Vu
+63.5879)(
Vu
0.7848+0.719
Vu
0.8129+0.517
Vu
0.841)-
1=3.497 
m, 
then 
the 
value 
of 
h
2 
can 
be 
used 
as 
3.5 
m. 
(6) Height of furnace body
It is affected by factors such as the size of furnace particles and the strength 
of coke. 
h
4=(6.3008
Vu
-47.7323)(
Vu
0.7848+0.7833
Vu
0.7701+0.5769
Vu
0.7554)-
1=16.23m, 
then 
the 
value 
of 
h
4 
can 
be 
used 
as 
16.2 
m. 
(7) Height of furnace throat
The furnace throat plays an important role in controlling the material running 
and air flow distribution. The higher the height of the furnace throat, the higher the 
working burden of the furnace throat will be 
h
5
=
0.3527
Vu
0.2446
+
28.3805
Vu-
0.7554=2.548 m, then the value of 
h
5 can be used as 2.5 m. 
(8) Waist height. In the position of the furnace abdomen, the load of the furnace 
abdomen decreases slowly, and the non-reductive ore is reduced completely before 
entering the furnace waist. Therefore, the height of furnace waist should be suitable 
to the capacity of furnace abdomen. If the furnace abdomen is too large, the material 
may 
not 
work 
before 
entering 
the 
furnace 
waist. 

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101 
h
3=0.3586
Vu
0.2152-6.3278
Vu
-0.7848=1.982 m, then the value of 
h
4 can be used as 
2.0 m.