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Large face repair material of converter and preparation method

A technology of repairing material and large surface, applied in the field of refractory materials, can solve the problems of reducing the anti-scour and anti-slag erosion performance of large-surface repairing material, reducing the inorganic salt binding agent, reducing the spreading performance at medium temperature, etc. The effect of abundant resources and reduced usage

Inactive Publication Date: 2014-12-03
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

Especially for inorganic salt-bonding large-surface repair materials, in order to improve the middle temperature spreading performance, it is often necessary to increase the amount of inorganic salt binder, which will correspondingly increase the content of low-melting phase in the system, thereby reducing the large-surface repair. Conversely, in order to improve the anti-erosion and anti-slag erosion properties of large-surface repair materials, it is necessary to reduce the amount of inorganic salt binder used, so that the medium-temperature spreading performance of large-surface repair materials will be reduced.
Therefore, the service life of large surface repair materials combined with inorganic salts is generally not high, which is 10~20 furnaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, the parts by weight of the components of the converter large surface repair material are as follows: 70 brucite, 20 magnesia, 10 binder, 8 burning accelerator, and 5 additives.

[0024] Among them, the MgO content in brucite is ≥ 45%, the weight percentages of brucite with 1 2 o 3 Content: 3~8%, MgO content of forsterite ≥40%, SiO 2 Content ≤ 42%, particle size of mixed burning accelerator ≤ 1mm, of which 0.088mm < particle size ≤ 1mm accounted for 60%, particle size ≤ 0.088mm accounted for 40%; the additive is a mixture of polypropylene fiber and sodium tripolyphosphate.

[0025] The converter large-surface repairing material of this embodiment has been proved by industrial experiments to have good flow and spreading performance, sintering time ≤ 20 minutes, and service life ≥ 35 furnaces.

Embodiment 2

[0027] In this embodiment, the parts by weight of the components of the converter large surface repair material are as follows: brucite 60, magnesia 25, binder 15, burning accelerator 6, additive 4.

[0028] Wherein, the MgO content in the brucite is ≥ 45%, the weight percentages of the brucite with a particle size of 1 2 o 3 Content: 3~8%, the particle size of synthetic magnesia-calcium iron sand is ≤1mm, of which 0.088mm

[0029] The converter large-surface repairing material of this embodiment has been proved by industrial experiments to have good flow and spreading performance, sintering time ≤ 20 minutes, and service life ≥ 35 furnaces.

Embodiment 3

[0031] In this embodiment, the parts by weight of the components of the converter large surface repair material are as follows: brucite 50, magnesia 35, binder 15, burning accelerator 5, additive 8.

[0032] Among them, the content of MgO in brucite is ≥45%, the weight percentages of brucite with 12 Content ≤ 42%, forsterite particle size ≤ 1mm, of which 0.088mm < particle size ≤ 1mm accounted for 60%, particle size ≤ 0.088mm accounted for 40%; the additive is a mixture of polypropylene fiber and sodium tripolyphosphate.

[0033] The converter large-surface repairing material of this embodiment has been proved by industrial experiments to have good flow and spreading performance, sintering time ≤ 20 minutes, and service life ≥ 35 furnaces.

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Abstract

The invention discloses a large face repair material of a converter and a preparation method. The large face repair material of the converter is prepared from the following components in parts by weight: 30-70 parts of brucite, 20-60 parts of magnesite, 10-25 parts of binding agent, 2-10 parts of firing agent and 0-8 parts of additive, wherein the sum of the parts by weight of brucite, magnesite and the binding agent is 100. The preparation method comprises the steps of: taking brucite, magnesite and the binding agent, the firing agent and the additive according to the weight ratio; firstly adding brucite, magnesite and the binding agent to be mixed for 2-4 minutes in a forced mixer; and then, adding the firing agent and the additive to uniformly mix for 3-5 minutes. The preparation method disclosed by invention is simple; the raw materials are easy to get; the cost is low; and the prepared large face repair material has good medium-temperature spreadability, anti-scouring property, slag erosion resistance and short firing time. The large face repair material of the converter can be used for more than 35 converters.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a large surface repair material for a converter and a preparation method thereof. Background technique [0002] During the steelmaking process of the converter, due to the long-term mechanical impact and slag erosion at high temperature, the refractory materials on the bottom of the furnace and the large front and rear surfaces are easily damaged. The methods currently used for converter maintenance are slag splashing to protect the furnace and large surface hot repair. Due to the inhomogeneity of the damage of the lining material of the converter, local pits or grooves often appear on the bottom of the furnace or the large front and rear surfaces. The slag splashing protection furnace cannot repair the pits or grooves with serious melting loss alone, and the large surface Repairing materials can effectively solve this problem, and each repair can be use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 王志强洪学勤雷中兴田先明郑吉红姚亚双曹一
Owner 武钢集团有限公司
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