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Magnesian hot patching material and preparation process thereof

A preparation process and hot repair technology, which is applied in the field of magnesia repair materials, can solve the problems of non-environmental protection of the production process, long sintering time, and large material loss, and achieve the effects of good spreadability, short sintering time, and reduced dosage

Inactive Publication Date: 2021-09-17
初德增
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the disadvantages of the traditional magnesium hot-filling material, such as unenvironmental protection, long sintering time, poor fluidity, large material loss, etc., and provides a magnesium alloy with environmentally friendly process, long service life and low cost. The preparation technology of mass-heat replenishing material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the technical requirements of raw materials, the content of magnesium oxide in magnesia should be greater than 90%, the silica should be less than 3.5, the calcium oxide should be less than 5, and the body density should be greater than 3.4. The particle size is 0-12mm, the fine powder mesh is more than 200 mesh, and the passing rate is more than 90%. (The penetration of medium-temperature asphalt is 25 degrees Celsius (0.1mm) 60-80, the ductility is 10 degrees Celsius (cm) greater than 20, and the dynamic viscosity (mm / s) is 30-40. The softening point of asphalt is 80-90 degrees Celsius, and the ash content is less than 0.5. The coking value is greater than 48%.

[0025] First put 80 parts by mass of magnesia particles of 0-12mm into the mixing mill, put 8 parts by mass of asphalt in the container, keep the temperature of the asphalt at 50°C, add 4 parts by mass of gasoline and stir evenly into the mixing mill. Grind and stir for 6 minutes, then add 200-m...

Embodiment 2

[0028] According to the technical requirements of raw materials, the content of magnesium oxide in magnesia should be greater than 90%, the silicon dioxide should be less than 3.5, the calcium oxide should be less than 5, and the body density should be greater than 3.4. The particle size is 0-12mm, the fine powder mesh is more than 200 mesh, and the passing rate is more than 90%. (The penetration of medium-temperature asphalt is 25 degrees Celsius (0.1mm) 60-80, the ductility is 10 degrees Celsius (cm) greater than 20, and the dynamic viscosity (mm / s) is 30-40. The softening point of asphalt is 80-90 degrees Celsius, and the ash content is less than 0.5. The coking value is greater than 48%.

[0029] Put 60 parts by mass of 0-12mm magnesia particles into the mixing mill, put 7 parts by mass of asphalt in the container, keep the temperature of the asphalt at 50°C, add 3 parts by mass of gasoline and stir evenly into the mixing Grind and stir for 6 minutes, then add 200 mesh fi...

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PUM

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Abstract

The invention relates to the technical field of magnesian patching materials, in particular to a magnesian hot patching material and a preparation process thereof. The magnesian hot patching material comprises the following raw materials in parts by mass: 60-80 parts of large-particle magnesia, 7-8 parts of asphalt, 3-4 parts of an organic solvent and 8-30 parts of small-particle magnesia. The preparation process of the magnesian hot patching material comprises the following steps: crushing dead burnt magnesia into the large-particle magnesia and the small-particle magnesia; dissolving the asphalt in the organic solvent; mulling the large-particle magnesia and the asphalt so as to allow the asphalt to fully wrap the surface of the large-particle magnesia; and then adding the small-particle magnesia for mulling, and conveying a formed mixture into a ball press machine to be pressed into balls. The content of magnesium oxide in the magnesia is more than 90%, the content of silicon dioxide is less than 3.5%, the content of calcium oxide is less than 5%, and the volume density of the magnesia is more than 3.4 g / cm<3>.

Description

technical field [0001] The invention belongs to the technical field of magnesia repairing charge, and in particular relates to a magnesia hot repairing charge and a preparation process thereof. [0002] technical background [0003] In the production of converter steelmaking, the erosion and damage speed of the slag line of refractory lining bricks, the large surface of charging and tapping, and the slag line and furnace door in electric furnace steelmaking is much faster than that of the furnace wall, molten pool and At the bottom of the furnace, in order to ensure that the overall service time of the lining bricks is consistent and improve the overall service life of the lining bricks, it is essential to repair the damaged parts. [0004] There are mainly two kinds of magnesia large surface repair materials currently used, namely magnesia loose large surface self-flowing material and magnesia block hot patching material. [0005] Magnesium bulk self-flowing material is mad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/628C04B35/626C04B35/634
CPCC04B35/043C04B35/62802C04B35/62695C04B35/63496C04B2235/5427C04B2235/5436
Inventor 初德增
Owner 初德增
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