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The main properties and physical and chemical indexes of castable in blast furnace ditch

Words:[Big][Medium][Small] Mobile Page Two-Dimensional Code 2018-10-15     

Due to China's blast furnace iron ditch in the past with clay clinker, coke, guangxi white mud and tar asphalt ramming refractory castable, iron less, repair frequently, labor intensity, pollution of the environment;Later, the use of Al2O3 ~ SiC ~ C ramming material, iron pass significantly increased, but the labor intensity is large;In the late 1980s, Al2O3 ~ SiC ~ C super low quality cement refractory castable was developed.This kind of castable is generally made of dense white corundum, sub-white corundum, brown corundum, high quality high alumina clinker, silicon carbide and flake graphite, and then mixed with superfine powder, binder and additive.Its performance is shown in the following table.In the table, middle and high grade products are suitable for large and medium blast furnace iron ditch, middle and low grade products are suitable for medium and small blast furnace iron ditch or slag ditch.

Item

hige grade

middle grade

low grade

chemical component /%

Al2O3

SiC

SiO2

C

72~74

14~15

3~4

4~5

73~75

14~15

2~3

3~4

65~67

15~16

3~4

2~3

65~70

15~16

2~3

2~3

63~65

14~5

7~10

4~5

pressive strength/MPa

110℃

1000℃

1450℃

20~25

35~40

70~75

15~20

25~30

45~50

15~20

40~45

55~60

15~20

40~45

55~60

10~13

20~25

40~45

rupture strength/MPa

110℃

1000℃

1450℃

4.0~4.5

5.5~6.0

8.0~8.5

3.2~3.5

4.3~4.5

7.2~7.5

3.5~3.8

5.5~5.9

8.0~8.5

3.0~3.5

3.5~4.0

6.5~7.0

1.5~2.0

3.5~3.7

5.0~5.5

high temperature rupture strength/MPa

1400℃*2h

1.3

1.7

1.5

2.4

1.5

burn after line changes/%

apparent porosity/%

1450℃

1450℃

+0.03

17.5

+0.01

19.7

+0.04

16.5

+0.06

18.0

-0.05

20.2

volume density/ g·cm-3

2.87

2.95

2.94

3.00

2.64

 

Blast furnace ditch is high temperature molten iron or slag flow through the channel, its refractory lining should have the following characteristics :(1) resistant to iron and slag erosion and erosion ability;(2) good thermal shock resistance and small change of reburning volume;(3) strong antioxidant capacity;(4) easy construction, fast baking without bursting, easy to repair and dismantle;(5) when in use, no harmful gas, no slag iron, long life.These characteristics are complementary and should be compatible with each other.

 

Iron ditch refractory castable is generally ultra-low cement refractory castable, also useful low cement or no cement refractory castable.At home and abroad, blast furnace ditching also useful artesia refractory castable, no stirring on site refractory castable, mixed with organic explosion-proof agent refractory castable and no-bake refractory castable, etc., its characteristics are convenient construction and baking safety.



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