No abstract

Industrial zirconium dioxide is currently used in the USSR for the production of electrosmelted ZrO 2 destined for the production of charging, tamping masses, and other products [1]. In other countries, zirkite, fobas, zircon, baddeleyite, ere, are used for this purpose [2][3][4][5][6][7]; a stabilized material is produced from these materials with the addition of CaO directly to the batch.The Ore-Dressing Works of the Kovdorsk Refractory and Ceramic Board has now started up and it is now possible in the USSR to use baddeleyite for the production of eleetrosmelted ZrO 2. The dressed baddeleyite from the Kovdorsk deposit is characterized by a high concentration of ZrO2 + HfO 2 [8,9] and it is thus pos~ sible to stabilize it by electrosmelting by the method used for producing electrosmelted powders from industrial ZrO 2 [1].The possibility of obtaining electrosmelted baddeleyite products was previously reported in [10] but such products had a low thermal-shock resistance from 1300~ (two or three cycles in water).Studies have been carried out at the Ukrainian Scientific-Research Institute of Refractories with the aim of developing the production methods for thermal-shock resistant products made from electrosmelted 9 Untreated material; contained 0.04% TiO2; 0.13%, R20; and 0.32% calcin, loss. tUntreated material: contains 0.27% TiO2; traces of R20; and 0.76% calcin, loss.