Insulating silica brick from “Strupets” quartzite deposits

Conclusions

Quartzites from the Strupets deposits In the Slivensk area of the Bulgarian People's Republic are suitable materials for producing insulating silica brick with an apparent density of 1.0–1.2 g/cm³ by the combustible additive method.

The coke used as the combustible with a high content of ash reduces the refractoriness of the insulating brick. An increase in the content of combustible is connected with a reduction in the apparent density, and a reduction in the strength of the products.

We established the possibility of using dinas scrap for producing insulating brick; its effect on the properties of the finished product are of secondary importance.

The specific fabrication pressure within the limits investigated can affect the ceramic factors of the finished goods.

The properties of the fired specimens correspond to the requirements of the technical specifications of the Bulgarian People's Republic for insulating silica brick.