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Gunning mix for blast furnace tapping channel

A blast furnace tapping and gunning material technology, which is applied in the field of refractory materials, can solve problems such as spalling and ditch lining cracks, and achieve the effects of preventing spalling and spalling, avoiding bursting, and improving erosion resistance and erosion resistance

Active Publication Date: 2014-10-08
ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a gunning material for a blast furnace tapping trough, aiming to solve the problem that the trench lining is easy to crack and peel off in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A blast furnace iron trench gunning material, comprising 40 parts of 3-5mm mullite, 30 parts of 1-3mm brown corundum, 15 parts of 0-1mm silicon carbide, 12 parts of alumina powder, 6 parts of cement, 0.2 Parts of explosion-proof fiber, 2 parts of graphite, 4 parts of ferrosilicon nitride, 1.5 parts of resin powder, 7.5 parts of aluminum sol.

[0018] The 3-5mm mullite is ω(Al 2 o 3 )≥72% and ω(SiO 2 )≥26% high-purity mullite, the 0-1mm silicon carbide is 98 silicon carbide with ω(SiC)≥98%, and the alumina powder is ω(Al 2 o 3 )≥99% of α-Al 2 o 3 Micropowder, the cement is ω(Al 2 o 3 )≥79% of A-80 cement.

[0019] Described ω (a) represents the massfraction of compound a; In this instance, Al in blast furnace tapping trough gunning material 2 o 3 The mass fraction of SiC is 74.6%, and that of SiC is 14.3%.

[0020] The fiber length of the explosion-proof fiber is 10mm.

Embodiment 2

[0022] The difference from Example 1 is that: according to the mass ratio, it includes 45 parts of 3-5mm mullite, 35 parts of 1-3mm brown corundum, 25 parts of 0-1mm silicon carbide, 8 parts of alumina powder, 10 parts of cement, 0.1 1 part of explosion-proof fiber, 1 part of graphite, 3 parts of ferrosilicon nitride. In this example, Al in the blast furnace gunning material 2 o 3 The mass fraction of SiC is 80.3%, and that of SiC is 24.3%.

Embodiment 3

[0024] The difference from the above examples is that: according to the mass ratio, it includes 35 parts of 3-5mm mullite, 25 parts of 1-3mm brown corundum, 12 parts of 0-1mm silicon carbide, 12 parts of alumina powder, 8 parts of cement, 0.3 Parts of explosion-proof fiber, 3 parts of graphite, 5 parts of ferrosilicon nitride. In this example, Al in the blast furnace gunning material 2 o 3 The mass fraction of SiC is 66.5%, and that of SiC is 12.3%.

[0025] Adding anti-explosion agent in the present invention can increase the adhesion rate and prevent bursting and peeling off, especially when the high-temperature gunning, the voids formed by the melting of fibers increase the porosity and provide a channel for the rapid discharge of steam. When it is in the above range, the porosity of the material will increase and the anti-slag penetration ability will decrease. When it is lower than the above range, the effect will not be obvious.

[0026] Contains higher Al in the pres...

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Abstract

The invention relates to a refractory material and particularly relates to a gunning mix for a blast furnace tapping channel, which aims at solving the problems that a channel lining is easily cracked and dropped in the prior art. The gunning mix for the blast furnace tapping channel comprises the following components in parts by mass: 35-45 parts of mullite of which the granularity is 3-5mm, 25-35 parts of corundum of which the granularity is 1-3mm, 12-25 parts of silicon carbide of which the granularity is 0-1mm, 8-12 parts of alumina powder, 6-10 parts of cement, 0.1-0.3 part of explosion-proof fiber, 1-3 parts of graphite and 3-5 parts of iron silicon nitride. According to the gunning mix disclosed by the invention, by adding the explosion-proof agent, the adhesion rate can be increased and the cracking and dropping are prevented, and especially when the high-temperature gunning is carried out, since voids are formed by melting fibers, the porosity is increased to provide a passage for the rapid exhaust of the steam; the gunning mix contains relatively high content of Al2O3 and is suitable for a part with a serious melting loss need to be repaired on the main channel; cement is conductive to improving the initial strength of the gunning mix and thus the gunning mix can withstand relatively high vapor pressure and thus the burst is avoided and the gunning mix has relatively high adhesion force and durability; by adding iron silicon nitride, bonding strength between the oxide and non-oxide is improved; by virtue of the gunning mix disclosed by the invention, the service life of the main channel is prolonged.

Description

technical field [0001] The invention relates to a refractory material, in particular to a blast furnace tapping trough gunning material. Background technique [0002] The blast furnace operates continuously, and the tapping process is intermittent. The temperature of the molten iron is high, and the tapping time is long. The iron ditch is affected by the alternation of cold and heat for a long time, and it also has to bear the erosion and erosion of the slag and molten iron. The lining of the inverted ditch is often cracked and peeled off. During the use of the iron trough, there is always a phenomenon of uneven melting loss. In order to prolong the service life of the iron hook and maintain the normal operation of the blast furnace, it is generally maintained for baking-free ramming materials during the intermittent use of the iron hook People hotfix. [0003] In the blast furnace smelting production, due to the influence of various factors of the baking-free material itse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 常正钦朱国平王立旺王琪李新明
Owner ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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