Technical Paper
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Figure 4: Wear profile of ceramic cup made with Coranit bricks (Dunkerque ArcelorMittal – blast furnace n°4)
age for each BF part including tap-holes, staves and hearth lining. These data are compared against the expected wear pattern required to achieve the desired campaign lifetime [8]. The current report shows the only area of concern is the copper staves, but repair of this section is much easier than in the hearth.
It seems logical that wear evolution may be uneven around the lining, for many reasons such as tap-hole asymmetry, localized accidents resulting from BF operating actions, BF stoppage and restart, tuyere leakage, local ilmenite injection, etc.
As a consequence, a “weak point” could be eventually detected and measured in a specific location of the crucible (worst scenario). However, whatever the origin of this issue and even if this weak point is localized and not representative of the global ceramic cup erosion profile on all the circumferential BF part, this weakest point will be used to determine the real lifetime of the ceramic cup walls inside the blast furnace.
The main data and results of Sialon bonded lining performances in real conditions will be discussed hereafter. For ArcelorMittal, a deeper investigation will be performed based on in-situ data and for Thyssen Krupp results already reported by Rüther and al. 2015 [3].
RESULTS ArcelorMittal Dunkerque BF n°4
In this blast furnace, a Coranit wall was installed with a brick initial thickness of 400 mm (Figure 3, Figure 4). Thermocouples are installed regularly all around the refractory hearth for elevations ranging from 2.4 m to 4.4 m height, below the tap-hole area. Data communicated for this blast furnace were covering the first 9 years after blow-in (2001-2010) and results up to this date were clear enough to closely and accurately monitor the wearing process on the Ceramic Cup.
Figure 5: Illustration of tap-hole repair – April 2016 (Dunkerque ArcelorMittal – blast furnace n°4) 22 ENGINEER THE REFRACTORIES July 2017 Issue
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