Obtaining fused magnesia-alumina spinel and using it to produce magnesite-spinel roof refractories

Klimkovich, N. S.; Kostyrya, Yu. F.; Arzumanov, M. A.; Dudavskii, I. E.; Davydov, I. P.; Mozgovoi, A. N.

doi:10.1007/bf01286439

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“…Corundum is melt-extracted from kaolin or another alumina raw material by reducing the silica in the presence of iron. After decanting, the ferrosilicon magnesite powder is added to the corundum melt and the spinel used for the production of refractories is synthesized by electrofusion [35].…”

Section: 500mentioning

confidence: 99%

More efficient utilization of alumina in refractories production

Kainarskii¹

1978

Refractories

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Commercial alumina is used for the production of refractories either alone or in combination, i.e., mainly with silica and magnesia. Most of the alumina is used for the production of high-alumina refractories containing a minimum of 62 and 72% A1203 in conformity with TU 14-8-207-76. These refractories can be produced more efficiently from a natural high-alumina raw material, a fact which is demonstrated by the experience of foreign countries [1] and the use of low-iron bauxite by the Soviet refractories industry.High-alumina chamotte is produced by sintering a mix of commercial alumina and clean refractory clay or kaolin in various types of kilns. To produce mullite chamotte a mix of commercial alumina and Novoselitsy kaolin must be fired at 1700~ and a mix with Prosyanovsk clay at a temperature not below 1750~ [2, 3], i.e., at a temperature which gives a thoroughly sintered corundum chamotte. Up to a temperature of 1500"C the alumina and clay mixes give mullite of the composition 3A1203 9 2SiO~ but higher temperatures (up to 1750~ and an excess of alumina will produce mullites of varied composition right up to 2A120 ~ "SiO~ [4], The properties of refractories produced from mixes of commercial alumina ~nd clay are not stable enough. It is known [5] that the protracted afterfiring of the commercial refractories VG-62 and VG-78 containing 62 and 78% Al203, respectively, at 1350~ (25-300 h) and 1500~ (25-100 h) results in an increase in the open porosity of the VG-78 type products and in a decrease in their strength when fired for 300 h at 1350~ but in its increase when they are fired for 10O h at 1500~ while the refractoriness under a load of 2 kgf/cm ~ increases by 80 and 70~ respectively, and the rate of deformation in creep tests also increases. The properties of VG-62 refractories are more stable than those of the VG-78 type; the refractoriness under a load of 2 kgf/cm 2 and the rate of deformation in creep tests of these refractories are similar to those of the VG-78 type. This behavior in protracted heating is explained by the fact that the viscosity of the liquid phase decreases and the proportion of solid phase increases with an increase in the A1203 content [6] with the result that the deformation properties of the refractories undergo a change.

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Section: 500mentioning

confidence: 99%

More efficient utilization of alumina in refractories production

Kainarskii¹

1978

Refractories

View full text Add to dashboard Cite

show abstract

Obtaining fused magnesia-alumina spinel and using it to produce magnesite-spinel roof refractories

Cited by 1 publication

References 5 publications

More efficient utilization of alumina in refractories production

More efficient utilization of alumina in refractories production

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