1979
DOI: 10.1007/bf01284649
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Effect of surface-active agents on the structural and mechanical properties of semidry chromium oxide masses

Abstract: Chromium oxide refractory products are irreplaceable for lining glass-melting tank furnaces for producing alkali-free borosilicate glass at 1550-1600~In mastering the production of chromium oxide blocks (measuring 710 x 360 • 90 mm in the raw state) from finely milled masses, a significant quantity of reject crock was obtained because of the prevalence of overpressing cracks. It therefore seemed of interest to study the structure--mechanical characteristics of finely dispersed chromium oxide masses.The present… Show more

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“…These data show that the static yield point, the maximum plastic strength, and the elasticity following the incorporation of corundum porous filler, without any plasticizing additives, are considerably lower than for corundum, finely grained bodies without the porous fillers [15], and chromium oxide granular bodies [16]. However, with the addition of porous filler in the form of corundum briquet these values are higher than with the incorporation of spherical corundum, which is connected with the sharply different shape and roughness of the surface of the filler.…”
mentioning
confidence: 87%
“…These data show that the static yield point, the maximum plastic strength, and the elasticity following the incorporation of corundum porous filler, without any plasticizing additives, are considerably lower than for corundum, finely grained bodies without the porous fillers [15], and chromium oxide granular bodies [16]. However, with the addition of porous filler in the form of corundum briquet these values are higher than with the incorporation of spherical corundum, which is connected with the sharply different shape and roughness of the surface of the filler.…”
mentioning
confidence: 87%
“…One of the advantages [7] is that we can obtain both laminated granules~ which is important for preparing briquet for subsequent milling and ensuring the best shellshaped grain form [2], and also homogeneous dense granules from highly refractory oxides used as finished goods [3, 4].…”
Section: 76211+666o7625]:66~099~2mentioning
confidence: 99%
“…
666.762.11+666o762.5]:66~099~2In recent years great interest has been shown in the granulation (pelletization) of refractories in order to produce high-density briquet [i, 2], and also in the use of granules as a finished product for various applications* [3][4][5].To obtain spherical bodies in the pellet form it is best to use a pan granulator with a high output [5][6][7].One of the advantages [7] is that we can obtain both laminated granules~ which is important for preparing briquet for subsequent milling and ensuring the best shellshaped grain form [2], and also homogeneous dense granules from highly refractory oxides used as finished goods [3, 4].One of the drawbacks of spherical articles obtained by granulation on a pan granulator is the ellipticity, numerically expressing the magnitude of the deviation from the sphere over three mutually perpendicular diameters.Furthermore, according to [5] the mechanical strength of freshly shaped granules is low, which causes loss both in the granulation process and during discharge from the granulator.Separation of the fragments (broken spheres) from the finished product is a laborious job.The present authors studied the effect of binders and body preparation on granulation and the properties of corundum and zirconia granules.The starting materials consisted of alumina GK and G-00 as specified by GOST 6912-74 containing more than 99.59 and 99.70% A1203, respectively, t The GK alumina contained 0.25% Na20, 0.19% alumina G-00.The concentration of other impurities was slight. We used zirconia grade Tsr0-1 (TsMTU 05-190-69), containing 99.4% Zr02, 0.2% SiO2, 0.1% A1203, 0.07% Fe203, 0.12% CaO, 0".11% Ti02.
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mentioning
confidence: 99%