Steel ladle cover light mullite castable material and preparation method thereof

A technology of lightweight mullite and castables, which is applied in the field of refractory materials, can solve the problems of low strength and low service temperature, and achieve the effects of low water absorption, high service temperature and simple production

Active Publication Date: 2017-06-30
ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, aluminum silicate fibers are added to the castable, which has low strength and low service temperature;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A lightweight mullite castable for a ladle cover, in parts by weight: 30 parts of 8-3mm lightweight mullite balls as aggregate, 5 parts of 15-0mm plate-shaped corundum, 5.5 parts of alumina micropowder, 5.5 parts of mullite micropowder, 1.5 parts of silica micropowder, 6.5 parts of binder, and 0.4 part of water reducing agent are the matrix part.

[0053] First mix the matrix part evenly, then add aggregate lightweight mullite balls, mix for 3-5 minutes and pack evenly. Put the uniformly mixed bulk material into the mixer, add 6-8wt% of water, and stir for 3-4 minutes. After it has good fluidity, it is poured into the ladle cover for vibration casting, and it is cured at room temperature for 24-48 hours. It can be baked on-line.

[0054] In this example, the binder is calcium aluminate cement; the water reducer is a mixture of sodium tripolyphosphate and sodium hexametaphosphate, with a mass ratio of 1:1.

[0055] The lightweight mullite castable for the ladle cover pr...

Embodiment 2

[0057] A light weight mullite castable for a ladle cover, in parts by weight: 33 parts of 8-3mm light mullite balls as aggregate, 5.5 parts of 15-0mm plate-shaped corundum, 5 parts of alumina micropowder, 5 parts of mullite micropowder, 1 part of silica micropowder, 6 parts of binder, and 0.3 part of water reducing agent are the matrix part.

[0058] First mix the matrix part evenly, then add aggregate lightweight mullite balls, mix for 3-5 minutes and pack evenly. Put the uniformly mixed bulk material into the mixer, add 6-8wt% of water, and stir for 3-4 minutes. After it has good fluidity, it is poured into the ladle cover for vibration casting, and it is cured at room temperature for 24-48 hours. It can be baked on-line.

[0059] In this example, the binder is calcium aluminate cement; the water reducer is a mixture of sodium tripolyphosphate and sodium hexametaphosphate, with a mass ratio of 1:1.

[0060] The lightweight mullite castable for the ladle cover prepared in th...

Embodiment 3

[0062] A lightweight mullite castable for a ladle cover, in parts by weight: 50 parts of 8-2mm lightweight mullite balls as aggregate, 10 parts of 5-0mm mullite particles, and 8.5 parts of alumina micropowder , 5.5 parts of mullite micropowder, 3.5 parts of silicon micropowder, 7.5 parts of binder, and 0.4 part of water reducing agent are the matrix part.

[0063] First mix the matrix part evenly, then add aggregate lightweight mullite balls, mix for 3-5 minutes and pack evenly. Put the uniformly mixed bulk material into the mixer, add 6-8wt% of water, and stir for 3-4 minutes. After it has good fluidity, it is poured into the ladle cover for vibration casting, and it is cured at room temperature for 24-48 hours. It can be baked on-line.

[0064] Binding agent in this embodiment is p-Al 2 o 3 ; The water reducer is a mixture of sodium tripolyphosphate and sodium hexametaphosphate, with a mass ratio of 1:1.

[0065] The lightweight mullite castable for the ladle cover prepar...

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Abstract

The invention discloses a steel ladle cover light mullite castable material including an aggregate and a matrix and including the components in parts by weight: the aggregate comprising 30-70 parts of light mullite balls, and the matrix comprising 0-15 parts of tabular corundum, 0-15 parts of mullite particles, 5-15 parts of an alumina micro powder, 5-15 parts of a mullite micro powder, 0-8 parts of a silicon micro powder, 5-15 parts of a binder, and 0.1-0.4 part of a water reducer. The invention also discloses a preparation method of the steel ladle cover light mullite castable material, wherein the preparation method comprises the following steps: firstly, mixing the matrix parts evenly; and then adding the light mullite balls, and then mixing evenly and packing. The steel ladle cover light mullite castable material has the advantages of simple production, high production efficiency, convenient field construction, low volume density, low thermal conductivity coefficient, excellent thermal shock resistance, high strength, and good high temperature volume stability and the like, and has the use temperature reaching up to 1550 DEG C.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a ladle cover lightweight mullite castable and a preparation method thereof. Background technique [0002] In modern iron and steel production, energy saving and consumption reduction is a major issue for the steelmaking industry, especially at present with serious environmental protection problems, excess steel production capacity, low profitability of iron and steel enterprises, increasing attention to energy saving and consumption reduction, and the development of lightweight castables cannot be delayed. At present, there are many kinds of lightweight thermal insulation castables, mainly by increasing the apparent porosity in the castable and reducing the bulk density to reduce the thermal conductivity of the castable. However, there are problems that the increase of apparent porosity will lead to the reduction of the strength of lightweight castables and the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 程文雍方斌祥刘光平魏国平方义能陈希来
Owner ZHEJIANG ZILI HIGH TEMPERATURE TECH CO LTD
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