Application of refractory aggregate in low cement castable refractory

September 18, 2018

Application of refractory aggregate in low cement castable refractory

In the preparation of low cement castable refractory, refractory aggregates generally do not use broken materials, but use multigrade particle grading. Different types of refractory aggregates have different properties for formulated low cement castables. It can be seen from the table that the refractory castable have different drying crushing strength , that is, the quality of the refractory aggregates directly affects its performance. Because of good aggregate with the low porosity and small water absorption rate, so the castable needs less water, the performance can be improved.

Influence of aggregate variety and quality on castable

 

Refractory Aggregate

 

Variety

White Corundum

Brown Corundum

Mullite

First Grade Clay Clinker

Three Grade Clay Clinker

Porosity %

3.4

4.7

3.4

7.2

<5

 

Low Cement Castable Refractory

 

Water Consumption%

5.0

5.5

5.5

7.0

7.5

Drying Crushing Strength MPa

123

107

117

90

80

 

In the preparation of low cement castables, refractory raw materials with good sintering and compact structure should be selected as refractory aggregates and powders. If necessary, iron removal and sorting should be carried out. Raw materials that are not burned or mixed with harmful impurities should never be used as bone powder.

 

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