Electric Steel Melting Furnaces Research Articles

Lining of tap holes of large-tonnage electric steel melting furnaces

Lining of tap holes of large-tonnage electric steel melting furnaces

Periclase-carbon products for electric steel-melting furnaces

Periclase-carbon articles made of sintered periclase powders, prepared with the use of the “press-packet” technolotical schedule, have a very low gas permeability and a rather high magnetic susceptibility. The use of periclase-carbon articles facilitated an increase in the resistance of the walls of 100-ton electric steel-melting furnaces with water-cooled panels by 1.8–2.5 times compared with the life of walls made from fired periclase-chromite articles. The nature of the wear of periclase-carbon products is due to their slag destruction and the reduction in the magnetic susceptibility. The cemented blocks of periclase-carbon articles using periclase-iron mortar in the walls of 100-ton electric steel-melting furnaces had the same wear resistance as for separate periclase-carbon bricks. It is desirable to continue testing periclase-carbon bricks made from sintered periclase powders in order to determine the most rational regions of application, and their introduction into production in refractory factories.

Mullite corundum articles for electric furnace roofs

Using a method developed by the Institute the authors produced an experimental batch of synthetic mullite-corundum refractories containing more than 72% Al/sub 2/O/sub 3/. The properties of these refractories exceed similar properties for regularly produced articles close in composition, which enables them to recommend them for use in the roofs of arc electric steel-melting furnaces. The experimental batch of synthetic mullite-corundum articles is being sent for testing in DSP-100 furnaces at the Chelyabinsk Metallurgical Combine.

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

A method was developed for producing fused spinel which, when used in place of chromite as a component of the charge for basic refractories, yields roof products characterized by enhanced refractoriness under load, and also by low creep at elevated temperatures. This ensures high factors for the other properties. The preliminary testing of the refractories in the roofs of electric-steel melting furnaces demonstrated an increase in their wear resistance by 26–33% compared with the resistance of the currently supplied periclase-spinel refractories, which are used normally in these conditions.

Service of periclase-spinel products made from magnesite powder with additions of titanomagnetite concentrate

Periclase-spinel products made on the basis of magnesite powder obtained from caustic magnesite with additions of titanomagnetite concentrate, satisfy the requirements of GOST 10888-64 for highly refractory magnesite-chromite products for building the roofs of open-hearth and electric steel-melting furnaces, with the exception of spalling resistance, which does not always meet these requirements.

Periclase ?spinel products from magnesite powder with high alumina content

Periclase-spinel articles with low contents of chromite made from magnesite powder containing magnesia-alumina spinel have a high range of physicochemical properties (except spalling resistance) and completely satisfy the requirements in service for the roofs of open-hearth and walls of electric steel-melting furnaces.

Highly refractory cements VTsZ

The use of VTsZ (highly refractory Zaporozhe cements) for laying basic refractories in electric steel melting furnaces will greatly prolong the life of the structure and enable the use of mechanized block methods of repairs, which will reduce refractories consumption and greatly reduce downtime with a corresponding increasing in molten metal output.

Properties of magnesite ramming mixtures for electric steel furnace bottoms

Dead burned magnesite without free lime and with an alcohol sulfite binder is recommended for the production of carbon free ramming mixtures. Magnesite mixtures with the above binder retain high refractoriness and are sufficiently resistant to the effects of hydration in drying and firing rammed bottoms. In regard to firing properties they are superior to mixtures with fusible binders. Thoroughly rammed mixtures with a sufficient amount of fines produce a highly resistant bottom in electric steel-melting furnaces. A gradual sintering of the rammed mixtures occurs under the action of the migration of liquid metals at high temperatures in service. It is, therefore, recommended to base the production of magnesite ramming mixtures for electric steelmelting furnaces on dead burned magnesite with an alcohol sulfite binder. The use of the above mixtures in the industry would facilitate ramming and repair work in comparison to mixtures to which carbon binders have been added.

Discussion on “Large electric steel-melting furnaces” at a joint meeting of the Institution and the Iron and Steel Institute, 8 May, 1919

Discussion on “Large electric steel-melting furnaces” at a joint meeting of the Institution and the Iron and Steel Institute, 8 May, 1919