Tests of periclase-spinel-carbon articles in the lining of an iChKM-10-S1 mixer

Full-scale tests of pilot batches of periclase-spinel-carbon articles of grade PShUS-2 produced by the Dinur Company in the lining of the tank of an IChKM-10-Sl mixer operating at the Sinarskii Pipe Plant are described. The effectiveness of the use of the tested refractories is 2.5-3.0 times higher than that of corundum articles of grades KSP and KF. The endurance of the refractories is determined by the rate of oxidation of carbon.     

MgO−Al2O3−Cr2O3 refractories of increased corrosion resistance for nonferrous metallurgical furnaces

The paper sums up a study that had as its objective to develop MgO−Al₂O₃−Cr₂O₃ refractories of increased corrosion resistance for harsh service conditions. The refractories thus developed, designated PShKhM-1 and PShKhM-2, have better high-temperature strength and abrasion resistance than PKhS refractories manufactured commercially. The experimental refractories will enhance the durability of furnace and converter linings, extend their campaigns, step up their productivity, and reduce consumption of refractories and repair costs. Translated from Ogneupory i Tekhnicheskaya Keramika, No. 1, pp. 33–37, January, 1998.     

Effect of the crystalline from of Al2O3 on the interaction and sintering of large-crystal quartzite and disperse alumina

It is established that the amount of mullite and the value of the open porosity of specimens increase in the sequence -Al₂O₃(+)-Al₂O₃-Al₂O₃Al₂O₃ · 3H₂O. The apparent density and the ultimate compressive strength increase in the reverse direction. Active modifications of alumina (hydrargillite, -Al₂O₃) stimulate mullite formation, which is accompanied by an increase in the open porosity to 40% and a decrease of the mechanical strength to 8–12.5 MPa, and high (up to 12%) linear shrinkage. High-quality, dense, strong refractories can be produced in a single firing from coarse-grained quartzite and finely disperse corundum and alumina in the form of -Al₂O₃.Translated from Ogneupory, No. 10, pp. 18 – 20, October, 1994.Eastern Institute of Refractories.     

Phase radiometeoric apparatus for comparing time scales

The design principles and advantages of a phase radiometeoric apparatus for comparing time scales are considered. The principal characteristics are presented together with the results of tests of samples. Translated from Izmeritel'naya Tekhnika, No. 5, pp. 27–30, May, 1998.     

Development of a technology for producing molds on gypsum binder

A technology for producing forming mixtures for casting molds based on various refractory fillers and a gypsum binder is developed. An optimum composition is suggested that includes 35% powdered KP-3 quartz calcined at 900°C, 35% fly ash, and 30% gypsum plus additions regulating the casting properties of the forming mixtures. The introduction of the developed composition and the technological process for the production of molds made it possible to decrease the thickness of aluminum-base castings by a factor of 2–3, the mass of cast parts by 30–50%, and the labor intensity by a factor of 2–3.Translated from Ogneupory, No. 6, pp. 16–20, June, 1995.     

Slag and hot-slag resistance of basic refractories

Conclusions Using the instrument described, which has been improved in design for testing refractory materials for slag and hot slag resistance, we investigated the properties of magnesite, magnesite-chromite, and chrome-magnesite specimens. It was established that their life is determined by the resistance of the refractory bond. The best resistance is possessed by periclase-spinel specimens. An increase in the content of calcium oxide in the slags reduces the slag resistance of all periclase-spinel refractories that were tested. Impregnating the magnesite products with a saturated solution of chromium acetate and firing them after impregnation at 400–500°C markedly increases their slag resistance.Translated from Ogneupory, No. 7, pp. 47–52, July, 1968.