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Semi-steel can permanent layer castable

A permanent layer and castable technology, which is applied in the field of blast furnace ironmaking, can solve the problems of castable strength reduction, permanent layer drop, peeling, etc., achieve good application prospects, increase service life, and improve heat storage capacity

Inactive Publication Date: 2019-03-29
GANGCHENG GRP LIANGSHAN RUIHAI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The blast furnace molten iron is pretreated by "vanadium extraction" or "three removals" to form semi-steel. The semi-steel tank is used as the carrier for the semi-steel. The tank shell is usually protected by masonry or pouring refractory materials to realize the transportation of the semi-steel. Refractory materials are divided into permanent layer materials and working layer materials. During the transportation of semi-steel tanks, the strength of castables will decrease due to the temperature drop during transportation.
After each overhaul, the semi-steel tank will replace the working layer. If the strength is reduced during the replacement process, the permanent layer will fall during the brick removal process. Because the permanent layer refractory materials will form different phases during online use. , along with expansion or contraction, cracks will occur at the edge of each part, and in severe cases, it will cause large-scale peeling off, which will seriously affect the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] The raw material formula shown in Table 3 is used for batching. After the raw materials pass the test, they are sampled and tested after weighing, stirring, and packaging. The physical and chemical indicators are as shown in Table 4:

[0060] Raw material proportioning that table 3 embodiment 1 adopts

[0061]

[0062]

[0063] Table 4 The physical and chemical testing results of the semi-steel tank permanent layer castable made in Example 1

[0064]

[0065] Example 1 The castable for the permanent layer of the semi-steel tank was used as the refractory integral castable material for the permanent layer of the semi-steel tank. This time, 45 tons of the castable for the permanent layer of the semi-steel tank were sent to the cold repair area of ​​the semi-steel tank, and 3 semi-steel tanks were collected. The data after an overall overhaul was compared with the overhaul data of the original castables. The pouring performance of the three test half-steel tanks w...

Embodiment 2

[0067] The raw material formula shown in Table 5 is used for batching. After the raw materials pass the test, they are sampled and tested after weighing, stirring, and packaging. The physical and chemical indicators are as shown in Table 6:

[0068] Raw material proportioning that table 5 embodiment 2 adopts

[0069]

[0070] Table 6 The physical and chemical testing results of the semi-steel tank permanent layer castable made in Example 2

[0071]

[0072] Example 2 The castable for the permanent layer of the semi-steel tank was used as the refractory integral castable material for the permanent layer of the semi-steel tank. This time, 45 tons of the castable for the permanent layer of the semi-steel tank were sent to the cold repair area of ​​the semi-steel tank, and 3 semi-steel tanks were collected. The data after an overall overhaul was compared with the overhaul data of the original castables. The pouring performance of the three test half-steel tanks was better th...

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Abstract

The invention relates to a semi-steel can permanent layer castable. The semi-steel can permanent layer castable comprises, in percentage by weight, greater than or equal to 60% of Al2O3, greater thanor equal to 10% of SiO2, less than or equal to 1% of CaO and less than or equal to 1% of water. By means of the iron-making blast furnace main iron runner fire-resistant castable which is superior inperformance, high in heat storage capacity, stable in thermodynamic performance and long in service life, the problems of temperature reduction and low castable strength which are caused in a semi-steel can online transportation process, and increase and enlargement of cracks after an overhaul can be effectively solved. According to the semi-steel can permanent layer castable, flint clay and alumina hollow balls are used as main aggregate, high-purity aluminum, silicon and fire-resistant cement are used as binding agents, sodium hexametaphosphate is used as a dispersion agent, thus the semi-steel can permanent layer castable is produced, the heat storage capability and the thermal performance of a semi-steel can permanent layer can be effectively improved, the phenomenon of cracking causedby extreme cold and extreme heat can be effectively avoided, and the service cycle is obviously prolonged, so that the semi-steel can permanent layer castable has good application prospects.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking, in particular to a permanent layer castable for a semi-steel tank. Background technique [0002] The blast furnace molten iron is pretreated into semi-steel after "vanadium extraction" or "three-stripping", and the semi-steel tank is used as the carrier for holding the semi-steel. Refractory materials are divided into permanent layer materials and working layer materials. When the semi-steel tank is transported, the strength of the castable will be reduced due to the temperature drop during transportation. After each overhaul, the semi-steel tank will replace the working layer. If the strength is reduced during the replacement process, the permanent layer will fall off during the brick removal process. Since the permanent layer refractory material will form different phases during online use , along with expansion or contraction, cracks will occur at the edge of the phase in var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B33/13
CPCC04B33/13C04B35/66C04B2235/3208C04B2235/3217C04B2235/3222C04B2235/3418C04B2235/5208C04B2235/528C04B2235/77C04B2235/96C04B2235/9615
Inventor 青光红王彬黄天翔赵杰高亮胡志豪邓小兵陈超蒋发燕
Owner GANGCHENG GRP LIANGSHAN RUIHAI IND
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