Production technology as a factor in the characteristics of the pores of the refractory

Conclusions

The parameters of the effective pores of refractories depend on the technological production parameters, viz., the grain-size distribution and chemical composition of the batch, the method of forming the product, and the firing temperature. The size of the pores increases and their specific surface decreases with a decrease in the proportion of fine grains. These changes are particularly marked when the product contains less than 30% fine-ground component.

An increase in the firing temperature produces only a slight decrease in the size of the effective pores of quartzite products regardless of the grain-size distribution of the batch. The parameters of the effective pores of corundum and magnesite products, on the other hand, depend not only on the grain-size distribution and degree of compaction of the batch but also on the firing temperature. The effective pores are considerably larger in fired than in unfired products processed from coarse-grained batches. The change in the pores size of products processed from fine-ground corundum and magnesite batches is relatively small.

By varying the technological parameters the characteristics of the pores can be varied within wide limits for the purpose of producing a refractory which will meet the conditiond of its service.