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Using shaped refractories in the linings of the steel teeming (casting) ladles ensures a longer service life of the linings as compared to the linings obtained using unmolded refractories (ramming bodies).The application of unfired periclase-chromite refractories containing boric acid for conducting out-of-furnace treatment of steels is well known [i]. However, boric acid being hazardous (it has a Class III risk), the application of the technology of unfired refractories is restricted.In order to develop refractories Using the shells of fused periclase and periclase-chromite, we studied ii charges (Table i). All the charges (batches) contain 4% boron-magnesium additive (TU 113-12-151-84) above 100%; the results of its thermal analysis are shown in Fig. I.Before mixing, crushing of the materials was carried out using a jaw crusher and grinding was carried out in a ball mill for obtaining the 3-0 mm fraction. Thereafter, fine milling was carried out using a M-400 vibratory mill and screening was conducted in a vibrating screen and in a manually fed screen.The Nos. 1-4 and 7-9 bodies were prepared in a double-shaft Z-shaped mixer maintaining a feed charge of 150 kg. The Nos. 0, 5, 6, and i0 bodies were prepared using laboratory edgerunner mills; in this case, the weight of the charge amounted to i0-ii kg. We followed the loading sequence that is conventionally used for granular bodies.Tem )erature, ~ "~

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