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Preparation method of sintered ultrathin siliceous plate for pouring large high-quality steel ingot

A high-quality steel and silicon technology, applied in the field of steel production, can solve the problems affecting the internal performance and quality of the plate, shrinkage cavity, etc., to achieve the effect of optimizing thermal shock resistance, optimizing performance, and ensuring cleanliness

Pending Publication Date: 2021-09-21
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the rapid heat dissipation around the ingot during the production of traditional large steel ingots, and the core is often solidified last, so defects such as porosity, shrinkage cavity, and segregation often occur, which affect the internal performance and quality of the final plate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example provides a method for preparing a fired ultra-thin siliceous plate for pouring large-scale high-quality steel ingots. First, put the granular material into the wheel mill and mix it for 5 minutes, and slowly add about 1 / 3 of the siliceous plate along a certain direction The binder is then mixed and milled for 3-5 minutes; then all the matrix pre-mixed with a strong mixer is added to the wheel mill and mixed for 8-10 minutes; finally, the remaining binder is slowly added and continued to be mixed and milled for about 20 minutes before discharging; Forming and heat treatment after 12-24 hours.

[0028] With fused silica as particles and fine powder, the proportions of 5-3mm, 3-1mm, 1-0mm, and 200-325 mesh are 20%, 26%, 22%, and 20%; pure ρ-Al 2 o 3 Micropowder 8%, silicon micropowder 1%, graphite 3%, citric acid (additional) 0.03%, silica sol (additional) 8% to 8.5%. Set the size of the furnace lining slab: 200~400×300~800×30~50mm, molding pressure 100MPa, ...

Embodiment 2

[0031] The difference between the method for preparing a sintered ultra-thin siliceous plate for pouring large-scale high-quality steel ingots provided in this embodiment is that it uses 45 coke gems (hard clay clinker) as particles, and its 5-3mm , 3-1mm, and 1-0mm are added in proportions of 15%, 25%, and 20% in turn; fused silica is a fine powder of 200-325 mesh and 27%. Activated alumina fine powder (wherein ρ-Al 2 o 3 Phase 50%) 10%, silica powder 2%, graphite 1%, tartaric acid (extra) 0.05%, mullite sol (extra) 9% to 10%. Set the size of the furnace lining slab: 200~400×300~800×30~50mm, molding pressure 120MPa, baking temperature 200°C, holding time 24h, then firing at 1450°C, holding time 10h.

[0032] The appearance of the liner is flat, without bending deformation, and its performance index: SiO 2 ≥60%, linear shrinkage rate -0.8%~-0.6%, bulk density 2.2~2.4g / cm 3 , Thermal conductivity (1000°C) 3.2~3.4w / m·k, compressive strength 60~70MPa.

Embodiment 3

[0034] A method for preparing a fired ultra-thin siliceous plate for pouring large high-quality steel ingots provided in this example differs from Example 1 in that silica is used as particles, and 5-3mm, 3-1mm, and 1-0mm are added The proportions are 20%, 25%, and 25% in turn; 70 sintered mullite 200-325 mesh 8%; fused silica is fine powder 200-325 mesh 10%. ρ-Al 2 o 3 Powder 10%, silica powder 1%, graphite 1%, citric acid (additional) 0.05%, silica sol (additional) 8% to 9%. Set the size of the furnace lining slab: 200~400×300~800×30~50mm, molding pressure 80MPa, baking temperature 200°C, holding time 24h, then firing at 1400°C, holding time 10h.

[0035] The appearance of the liner is flat, without bending deformation, and its performance index: SiO 2 ≥80%, linear shrinkage rate -0.5%~-0.4%, bulk density 1.9~2.1g / cm 3 , Thermal conductivity (1000°C) 1.2~1.4w / m·k, compressive strength 50~60MPa.

[0036] In summary, the fired ultra-thin silicon plate is suitable for pour...

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Abstract

The invention discloses a preparation method of a sintered ultrathin siliceous plate for pouring a large-scale high-quality steel ingot, and relates to the technical field of steel production; a lining plate adopts siliceous particles and fine powder with different granularities as main raw materials, rho-Al2O3 micro powder, silica micro powder, graphite, an inhibitor and a sol binder are added, a vibration pressure forming process is adopted, and sintering treatment is carried out in a high-temperature kiln. The prepared lining plate material is high in production forming efficiency, smooth, not prone to bending deformation, small in gap between plates and liners and tight in combination; and a sintered product is high in refractoriness, low in heat conductivity coefficient, high in strength, good in uniformity, convenient to construct, build and dismantle, and beneficial to efficient use of the lining plate material.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for preparing a fired ultra-thin siliceous plate used for pouring large high-quality steel ingots. Background technique [0002] Power and energy engineering usually requires large-scale steel ingots for the production of high-performance ultra-thick plates. Due to the rapid heat dissipation around the ingot during the production of traditional large steel ingots, the core is often solidified last, so defects such as porosity, shrinkage cavity, and segregation often occur, which affect the internal performance and quality of the final plate. Therefore, there is an urgent need to develop a refractory material for edge insulation, to eliminate defects such as looseness and shrinkage cavities in the center of large ingots, and to improve the purity of molten steel. [0003] Furnace lining materials play an important role in the pouring of large, high-qual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3418C04B2235/3217C04B2235/428C04B2235/425C04B2235/349C04B2235/3463C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B2235/9615
Inventor 冯海霞刘桂丽柳军李明夏志刚陶镳
Owner NANJING IRON & STEEL CO LTD
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