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Study on the Properties and Utilization of Waterless Taphole Clay in 1350m~3 Blast Furnace of Chongqing Iron & Steel Co. Ltd

Author: LiKeFen
Tutor: LiuQingCai；LiDaiRong
School: Chongqing University
Course: Materials Engineering
Keywords: waterless taphole clay the properties of taphole clay damage mechanism taphole application
CLC: TF573
Type: Master's thesis
Year: 2008
Downloads: 206
Quote: 0
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Abstract


According to the modern blast furnace being large scale, service longecity, and the increase of tapping time and the residue flux, higher requirements were introduced for the stability and service condition of taphole. To maintain trouble-free operation and high production, the depth of taphole is the key to make sure the operation stable. And the property of taphole clay is crucial to keep taphole operation stable.Characteriscs of BF smelting and the taphole working condition in Chongqing Iron & Steel Co. Ltd were analysed in this paper. Structure and damage mechanism of taphole clay were also studyed. By raising material purity and adding different addition, the structure and components of taphole had been optimized, the quality of the taphole clay had been improved, a new formulation and processing technology of taphole that accord with the requirement of 1350 m3 BF in Chongqing Iron & Steel Co. Ltd had been obtained, and the application had a good effect.The experiment results showed that with the addition of coke powder increasing, the waterless taphole clay volume density reduces, but apparent porosity increases, namely the permeability improves, the drying capacity increases, but the intensity reduces. With the addition of binding clay increasing, after burning at 1400℃for 3 hours, the waterless taphole clay volume density changes a little, but the apparent porosity decreases a lot. When the addition of clay is 15%, the antiflex intensity and pressurization of waterless taphole clay reach their maximum.With the addition of kyanite increasing, waterless taphole clay volume density changes a little after burning at 1400℃for 3 hours, but the apparent porosity increases a lot, the antiflex intensity and pressurization and the shrinkage decrease. Adding strengthened compound powder containing silicon nitride in the waterless taphole clay may enhance the anti- dregs iron corrosiveness and the anti-dregs iron erosion greatly. Increasing modified pitch, the apparent porosity decreases, the volume density, the antiflex intensity and pressurization increased .But the trend of the linear change rate after burning presents to be shinking and decreasing.The ratio change of tar pasta and carbolineum has a significant effect on the property of taphole clay.With ratio of tar pasta and carbolineum increasing, the apparent porosity decreased a little, but volume density, antiflex intensity and pressurization present to increase. The binder has an important effect on the property of taphole clay. The practice of application in production showed that the optimal waterless taphole clay can well satisfy the requirement of new BF in Chongqing Iron & Steel Co. Ltd. The quality of taphole clay had increased obviously ,and the leaking ratio and moisture of tap nozzle dereased greatly while ensuring depth of tap nozzle、nature of shedding、iron discharging time、anti- corrosion and anti- erosion satisfy the requirements of customers.

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CLC: > Industrial Technology > Metallurgical Industry > Ironmaking > Blast furnace (BF ) > Structure
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