Formation of a tridymite structure in dinas refractories for coke ovens

Conclusions

Replacement of pyrite-roasting residues with scale is a measure improving the physicoceramic properties and structure of dinas parts for coke ovens. The addition of scale in the dry condition makes it possible to prepare the milk of lime without iron oxides, increasing its activity for strengthening the raw part after drying.

Addition of scale with the active form of iron oxide FeO promotes a reduction in parts in the residual quartz content and an increase in the share of tridymite to 45–50% instead of the 30–35% with addition of pyrite-roasting residues in firing of dinas in tunnel kilns. A further improvement in the structure of dinas with an increase in the share of tridymite to 55–60% and more is possible only after increasing the final temperature of the hold to 1440–1450°C in firing parts from Ovruch quartzites. The year and a half of positive experince of Krasnoarmeisk Dinas Plant in the addition of scale to dinas parts for coke ovens should be extended to Krasnogorovka and Pervouralsk Plants.