Development and introduction of a production method for mullite corundum MKTsP-82 tiles

Abstract

The production of KP-95 corundum files [1, 2] involves certain laborious and energy-consuming processes in obtaining kaolinized corundum chamotte, including dry pressing the finely milled mixture of alumina and kaolin, replacing the briquet on kil cars, drying it, and firing in a tunnel kiln at 1520-1580~The Semiluksk factory has developed and implemented a method for the production of high-grade tiles for gate valves, which involves replacing the kaolinized corundum chamotte by a more economical material. It is best to use m~lite--corundum chamotte obtained at the Semiluksk factory, using the normal methods.The water absorption of the mullite--eorundum ehamotte is not more than 2%, * A1203 content not less than 85%, Fe203 not more than 0.5%, and SiO 2 9-10%. The main requirement in changing from kaolinized corundum ehamotte (not less than 95% A1203, not more than 0.5% Fe203 and 1.8-2% SiO2) to a material with a lower refractoriness was the preservation, together with the high density, of adequately high-temperature strength and corrosion resistance, which ensure the stable operation of the tiles.It is known that the high-temperature strength and also the resistance to the action of molten slags and metal by aluminosilicate refractories of a granular structure depend on the composition and structure of the * Here and subsequently parts by weight.

Means of increasing the service reliability of high-alumina slide gate plates

“…For example, the KP-95 plates are made up of crystals of corundum between which the glassy phase is uniformly distributed. The quantity of glassy phase (7-8 wt.%) and the character of its distribution are similar in the grain and binder portions of the charge [2,4].…”

“…For example, the KP-95 plates are made up of crystals of corundum between which the glassy phase is uniformly distributed. The quantity of glassy phase (7-8 wt.%) and the character of its distribution are similar in the grain and binder portions of the charge [2, 4].In the MKTsP-82 plates the same quantity of glassy phase is concentrated in the grains of the filler while in the binder portion of the charge the glassy phase is present only in the form of separate drop inclusions [2].The structure of the KTsMKhP-90 plates and of the inserts of the MKSPK-90 plates is characterized by the minimum (about 1.3%) content of glassy phase in the form of separate drop inclusions in the grains of the filler and in the binder [4].Such a distribution of the glassy phase in the plates is the result of technical features of their production. The KP-95 plates are produced according to a briquette method *At present, plates of CZ composition are designated type and composite plates types MKSPK-90, KSPK-90, and others, depending upon the material of the base…”

“…The investigations were made in the AllUnion Refractory Institute and under the conditions of Western Siberia Metallurgical Combine. The characteristics of the refractory materials of these plates and the method of their production were given earlier [1][2][3][4].It is desirable to note only the main differences in their structure -the quantity and character of distribution of the glassy phase. For example, the KP-95 plates are made up of crystals of corundum between which the glassy phase is uniformly distributed.…”

An analysis of the service of high-alumina plates of ladle slide gates

“…dum plates. The method of production of the plates, especially their structures and technical characteristics, were described earlier [8].…”

“…* During this period of time type KP-95 plates made of kaolinized sintered corundum from Semiluki Refractory Plant were used. The features of the method of production of KP-95 plates and their structure and technical characteristics were covered in detail earlier [6][7][8].…”