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Magnesia castable taking forsterite as main raw material and preparation method of magnesia castable

A magnesia castable and forsterite technology, applied in the field of magnesia castables, can solve the problems of insufficient strength and slag erosion resistance of magnesia castables, and achieve excellent slag erosion resistance and permeability, and slag erosion resistance. High-performance, wide-ranging effects

Inactive Publication Date: 2019-02-15
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods have played an important role in improving the hydration resistance, fluidity and production efficiency of magnesia castables, there are still deficiencies in the strength and slag erosion resistance of magnesia castables.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A magnesia castable with forsterite as the main raw material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0047] The first step, 35-45wt% forsterite fine powder, 10-15wt% magnesia fine powder, 5-10wt% lightly burned magnesium powder, 5-10wt% quartz sand fine powder, 1-5wt% Silicon micropowder, 1-5wt% ferrosilicon nitride, 1-5wt% magnesium citrate and 10-15wt% thermosetting phenolic resin were mixed uniformly, pressed and molded under the condition of 90-110MPa, and then in neutral atmosphere and 1000 Heat treatment at ~1200°C for 3 to 5 hours, and then crush, ball mill and sieve to obtain ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088 to 0.25mm.

[0048] In the second step, 1-5wt% of the silicon micropowder, 1-5wt% of the ferrosilicon nitride, 0.1-0.5wt% of citric acid, 1-5wt% of elemental silicon powder, 20-30wt% of The forsterite fine powder, 0...

Embodiment 2

[0052] A magnesia castable with forsterite as the main raw material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0053]The first step, 30-40wt% forsterite fine powder, 15-20wt% magnesia fine powder, 5-10wt% lightly burned magnesium powder, 1-5wt% quartz sand fine powder, 5-10wt% Silicon micropowder, 1-5wt% ferrosilicon nitride, 1-5wt% magnesium citrate and 10-15wt% thermosetting phenolic resin were mixed uniformly, pressed and molded under the condition of 80-100MPa, and then in neutral atmosphere and 900 Heat treatment at ~1100°C for 3 to 5 hours, and then crush, ball mill and sieve to obtain ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088 to 0.25mm.

[0054] In the second step, 5-10wt% of the silicon powder, 1-5wt% of the ferrosilicon nitride, 0.5-1wt% of citric acid, 1-5wt% of the elemental silicon powder, 10-20wt% of the The forsterite fine powder, 0...

Embodiment 3

[0058] A magnesia castable with forsterite as the main raw material and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0059] The first step, 40-50wt% forsterite fine powder, 10-15wt% magnesia fine powder, 1-5wt% lightly burned magnesium powder, 5-10wt% quartz sand fine powder, 1-5wt% Silicon micropowder, 1-5wt% ferrosilicon nitride, 1-5wt% magnesium citrate and 10-15wt% thermosetting phenolic resin were mixed uniformly, pressed and molded under the condition of 90-110MPa, and then in neutral atmosphere and 1000 Heat treatment at ~1200°C for 3-5 hours, and then crush, ball mill and sieve to obtain ball abrasives with a particle size of less than 0.088mm and granular materials with a particle size of 0.088-0.25mm.

[0060] In the second step, 5-10wt% of the silicon micropowder, 1-5wt% of the ferrosilicon nitride, 0.3-0.6wt% of citric acid, 1-5wt% of elemental silicon powder, 20-30wt% of The forsterite fine powder, 0.2-0.6...

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Abstract

The invention relates to magnesia castable taking forsterite as a main raw material and a preparation method of the magnesia castable. The technical scheme is that the preparation method comprises thefollowing steps: uniformly mixing forsterite fine powder, magnesite fine powder, caustic-burned magnesia powder, quartz sand fine powder, silica powder, ferrosilicon nitride, magnesium citrate and thermosetting phenolic resin, molding, carrying out heat treatment at 900 to 1200 DEG C in a neutral atmosphere for 3 to 5 hours, crushing, carrying out ball milling and screening to obtain a ball abrasive with the particle size less than 0.088 mm and a granular material with the particle size of 0.088 to 0.25mm; uniformly mixing the silica powder, the ferrosilicon nitride, citric acid, elemental silicon powder, the forsterite fine powder, hydroxyethyl cellulose and water and carrying out ball milling to obtain slurry; uniformly mixing forsterite particles, magnesite particles, the granular material, the ball abrasive, the slurry, polyvinyl alcohol fiber and a water reducing agent, thus obtaining the magnesia castable with the forsterite as the main raw material. A product produced by the preparation method disclosed by the invention has high strength and excellent slag corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of magnesium castables. In particular, it relates to a magnesia castable with forsterite as the main raw material and a preparation method thereof. Background technique [0002] Magnesium castables are widely used in high-temperature industrial kilns due to their advantages of high refractoriness, high softening temperature under load and purification of molten steel. However, due to the large coefficient of thermal expansion, the magnesia castables are cracked and have poor spalling resistance, which reduces the service life; the cracks of the magnesia castables during the baking process will lead to cracking or even scrapping of the furnace lining or prefabricated parts, which will affect the operation of the equipment safety, resulting in waste of resources. Forsterite is an alkaline refractory material, which has the advantages of high temperature resistance, strong corrosion resistance and good chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3206C04B2235/3418C04B2235/3445C04B2235/3873
Inventor 王洪红刘浩王周福王玺堂马妍
Owner WUHAN UNIV OF SCI & TECH
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