Slag line brick for steel ladle and preparation method

A technology of slag line bricks and ladle, applied in the field of refractory materials, can solve the problems of reduced thermal shock resistance, frequent offline, high thermal stress, etc., and achieve the effects of improving thermal shock stability, increasing economic benefits, and buffering thermal stress.

Inactive Publication Date: 2017-11-17
海城利尔麦格西塔材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesia-carbon brick is a kind of high-quality refractory material. Because this kind of carbon-containing refractory product has the advantages of high refractoriness, good slag erosion resistance, strong thermal shock resistance and low high temperature creep, it is widely used in electric furnaces, converters and ladles. application, and the service life has been greatly improved. At the same time, magnesia carbon bricks do not need to be fired at high temperature, saving energy, and the manufacturing process is simple, so they are quickly popularized and used. A simple tool for storing and transporting molten steel has been transformed into a generating device that can perform vacuum treatment, argon blowing, heating, composition fine-tuning, etc. in the ladle, making the use of the ladle extremely harsh, especially in the slag line of the ladle, making the slag line Bricks with slag lines frequently appear steamed bun-shaped, that is, the edge erodes faster than the middle of the brick, whi

Method used

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  • Slag line brick for steel ladle and preparation method

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preparation example Construction

[0026] The preparation method of the slag line brick for ladle specifically comprises the following steps:

[0027] 1) Ingredients: Dry mix additives and fused magnesia with a particle size of less than 1 mm in a vibrating mill to make co-milled powder for later use;

[0028] 2) Mixing: Mix and stir the preheated fused magnesia with 3mm≤particle size<5mm, 1mm≤particle size<3mm and the binder at 40-50℃, so that the binder is evenly wrapped on the surface of the fused magnesia particles, and then 3 Add magnesia-carbon waste brick fine powder and flake graphite to mix and stir, and finally add co-milled powder and mix at a speed of 1000-1500 rpm for 8-12 minutes, then mix at a speed of 500-800 rpm for 10-15 minutes For discharge, ensure that the discharge temperature is 40-50°C, and in order to avoid dry material production, control the waiting time of the mud material, and control the time between the mud material being rolled out and the start of molding within 30 minutes to en...

Embodiment 1-7

[0036] The preparation method of embodiment 1-7 ladle with slag line brick:

[0037] 1) Ingredients: Dry mix additives and fused magnesia fine powder in a vibrating mill evenly to make co-milled powder for later use, and weigh magnesia with various particle sizes, binder and additives according to the ratio for later use;

[0038] 2) Mixing: Mixing: Mix preheated fused magnesia with 3mm≤particle size<5mm, 1mm≤particle size<3mm and phenolic resin at 40-50°C, preferably at 45°C, and stir for 3-5min to make the binder Evenly wrap on the surface of fused magnesia particles, then add fine powder and flake graphite, mix and stir for 1-2 minutes, and finally add co-milled powder and mix at high speed for 8-12 minutes at a speed of 1000-1500 rpm, then mix at a low speed for 10-15 minutes The output speed is 500-800 rpm, and the output temperature is guaranteed to be 40-50°C. In order to avoid dry material production, the waiting time for the mud material is strictly controlled. To en...

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Abstract

The invention relates to a slag line brick for a steel ladle and a preparation method. The slag line brick for the steel ladle is prepared from, by weight, 10-40 parts of fused magnesite with the particle size greater than or equal to 3 mm but smaller than 5 mm, 5-30 parts of fused magnesite with the particle size greater than or equal to 1 mm but smaller than 3 mm, 10-20 parts of fused magnesite with the particle size smaller than 1 mm, 5-20 parts of magnesite-carbon waste brick fine powder, 12-16 parts of flaky graphite, 1-3 parts of bonding agent and 4 parts or less of additive. The slag line brick has the advantages that the problem that an existing slag line brick frequently produces a steamed bun shape in the using process is solved, the slag line brick for the steel ladle adopts phenolic resin having better wettability and moisture retention property, the pug temperature is strictly controlled, the phenomenon that mixed pug is dried too fast due to too high temperature is avoided, the adding amount of metal or alloy powder is appropriately controlled by increasing critical particle size, the graphite adding amount is increased, a heat stress is buffered by introducing a trace amount of additive, and the thermal shock resistance stability of the slag line brick is improved.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a slag wire brick for a ladle and a preparation method thereof. Background technique [0002] Magnesia-carbon brick is a kind of high-quality refractory material. Because this kind of carbon-containing refractory product has the advantages of high refractoriness, good slag erosion resistance, strong thermal shock resistance and low high temperature creep, it is widely used in electric furnaces, converters and ladles. application, and the service life has been greatly improved. At the same time, magnesia carbon bricks do not need to be fired at high temperature, saving energy, and the manufacturing process is simple, so they are quickly popularized and used. A simple tool for storing and transporting molten steel has been transformed into a generating device that can perform vacuum treatment, argon blowing, heating, composition fine-tuning, etc. in the ladle, making...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/622B22D41/02
CPCB22D41/02C04B35/043C04B35/622C04B35/62204C04B2235/3821C04B2235/3826C04B2235/401C04B2235/402C04B2235/425C04B2235/428C04B2235/608C04B2235/61
Inventor 李德峰王新杰张义先尹斌王健骁曹贺金钊
Owner 海城利尔麦格西塔材料有限公司
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