Refractory cast material for desulfurizing gunite

A technology for refractory castables and desulfurization spray guns is applied in the field of refractory castables for spray guns and refractory castables for desulfurization spray guns. problem, to achieve the effect of excellent sintering condition, improved sintering condition and high strength after sintering

Inactive Publication Date: 2003-09-10
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, scholars at home and abroad have conducted extensive research on refractory castables for desulfurization spray guns. It is known from the patent No. 61-99614 "Inヅユクシヨンランス for melting and milling treatment" published by Kawasaki Iron and Steel Co., Ltd., desulfurization spray guns The main improvement measures for castables are: use fused mullite and corundum materials with high aluminum content to improve the refractory performance of castables, add silicon carbide, carbon materials, magnesia powder, and magnesium aluminum spinel to improve the casting The anti-erosion performance of the material, the use of pre-melted columnar ceramic aggregates to improve the anti-erosion performance of the cast layer, etc.; the disadvantage is that no significant effect has been achieved in practical applications, and at the same time, the cost of the castable has risen sharply. Affected the economic benefits of molten iron injection desulfurization pretreatment production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: Prepare a batch of desulfurization spray guns by pouring with refractory castable ingredients for desulfurization spray guns with pretreated molten iron temperature ≥ 1320°C according to the present invention, and the components of the ingredients are calculated by weight percentage:

[0018] 29 coke gemstones, including: 7 (8~20mm), 13 (5~8mm), 9 (3~5mm)

[0019] Ordinary fused mullite 8, of which: 6 (3 ~ 5mm), 1 (1 ~ 3mm), 1 (0 ~ 1mm)

[0020] Ordinary fused mullite powder 3.5 (180 mesh)

[0021] Andalusite 33, of which: 15 (1 ~ 3mm), 18 (0 ~ 1mm)

[0022] Dense corundum fine powder 9 (325 mesh)

[0023] a-Al 2 o 3 Micropowder 5, silicon micropowder 5, silicon carbide 2 (180 mesh), pure calcium aluminate cement 5.5.

[0024] Addition: heat-resistant steel fiber 2.5, spodumene 4 (180 mesh), aluminum lactate 0.5, sodium tripolyphosphate 0.15, melamine 0.5.

[0025] The desulfurization spray gun prepared by pouring is used in steelmaking plants. The s...

Embodiment 2

[0026] Embodiment 2: Prepare a batch of granular magnesium desulfurization spray guns by pouring refractory castables with desulfurization spray guns with pretreated molten iron temperature ≥ 1320°C according to the present invention, and the batching components are calculated by weight percentage:

[0027] Focus gem 39, including: 10 (8 ~ 20mm), 13 (5 ~ 8mm), 16 (3 ~ 5mm)

[0028] Ordinary fused mullite 13, of which: 8 (1 ~ 3mm), 5 (0 ~ 1mm)

[0029] Ordinary fused mullite powder 6.5 (180 mesh)

[0030] Andalusite 18, of which: 8 (1 ~ 3mm), 10 (0 ~ 1mm)

[0031] Dense corundum fine powder 5 (325 mesh)

[0032] a-Al 2 o 3 Micropowder 6.5, silicon micropowder 6, silicon carbide 1 (180 mesh), pure calcium aluminate cement 5.

[0033] Addition: heat-resistant steel fiber 3.5, spodumene 1.5 (180 mesh), metal aluminum powder 0.5, sodium tripolyphosphate 0.3.

[0034] In the application of steelmaking plants, a 220-ton large-scale molten iron tank is used for short-distance mo...

Embodiment 3

[0035]Embodiment 3: use the refractory castable for the desulfurization spray gun of the present invention to pretreat the molten iron temperature to be less than 1320 ℃, pour and prepare a batch of desulfurization spray guns and apply them on the molten iron tank of the steelmaking plant, and the components of the batching are calculated as follows by weight percentage:

[0036] 50 coke gemstones, including: 7 (8~20mm), 13 (5~8mm), 15 (3~5mm), 6 (1~

[0037] 3mm), 9(0~1mm)

[0038] Andalusite 20, of which: 10 (1 ~ 3mm), 10 (0 ~ 1mm)

[0039] Dense corundum fine powder 7.5 (325 mesh)

[0040] a-Al 2 o 3 Micropowder 9, silicon micropowder 3, silicon carbide 3 (180 mesh), pure calcium aluminate cement 7.5.

[0041] Addition: heat-resistant steel fiber 1.5, aluminum lactate 0.3, metal aluminum powder 0.3, melamine 0.5.

[0042] The pouring preparation is the inverted T-shaped desulfurization spray gun applied on the molten iron tank of the steelmaking plant, and th...

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PUM

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Abstract

The present invention relates to a refractory cast material for desulfurizing gunite, and refractory material for desulfurizing pre-treatment of molten iron before steel-making in converter. Two kinds of cast materials in different components are provided for molten iron with temperature not lower than 1320 deg.c and that lower than 1320 deg.c separately. The aggregate for the cast material consists of three kinds of raw material including pyrojewel, common electrically molten mullite and andalusite; and proper amount of refractory steel fiber, mineralizing agent, water reducer and antinock agent are added into the cast material to improve the construction performance and use performance of the refractory cast material. The present invention is suitable for casting the refractory material layer of desulfurizing and dephosphorizing gunite and other thermal member.

Description

【Technical field】 [0001] The invention relates to a refractory castable for a desulfurization spray gun, in particular to a refractory castable for a spray gun used for desulfurization of torpedo tanks and molten iron tanks, and belongs to the field of refractory materials for desulfurization pretreatment of molten iron before converter steelmaking. 【Background technique】 [0002] At present, the structures of the desulfurization spray guns used by domestic and foreign metallurgical enterprises for blowing desulfurization outside the molten iron furnace before converter steelmaking vary according to the structure of the molten iron container and the type of desulfurizer used. For the injection desulfurization of molten iron in the torpedo tank, although the types of desulfurizers used are different, the desulfurization spray guns used are all inverted T-shaped double-nozzle desulfurization spray guns; for the injection desulfurization of molten iron in the molten iron tank, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C21C7/064
Inventor 欧阳德刚周明石
Owner 武钢集团有限公司
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