Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1996-03-12
1998-10-06
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75 1061, 75316, 75751, 164 97, 164129, 164323, 164412, C21C 528, B22D 300, C22B 100
Patent
active
058171649
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the field of ferrous metallurgy, more particularly to metal casting, namely to the casting of foundry pigs (that is to say metal casts intended for subsequent remelting), specifically to the manufacture of prepared blend materials for the steel-smelting production and also to machines for the casting of pigs primarily from pig iron with fillers.
The present invention relates also to processing of metal (melt) in a liquid or viscous state in casting molds and namely in molding boxes of casting machines using the pressure, specifically using mechanical devices.
More particularly, the present invention relates to processing of pig iron for the production of iron and steel effected both in converters and in electric furnaces, for example arc furnaces.
BACKGROUND OF THE INVENTION
When performing metallurgical conversion, that is to say while converting pig iron into steel, including the addition of a scrap metal, by various known processes such as the open-hearth, the converter, the electro-smelting processes, a blend, that is to say, a mixture of materials necessary to provide a predetermined chemical composition of metal and slag obtained, is also charged into a corresponding melting furnace apart from pig iron and a scrap metal. As a rule, the blend includes primarily oxidizing agents needed for a chemical coupling and for removing from a bath the carbon and other unwanted ingredients of the melt, such as sulfur, phosphorus, manganese and the like.
An important stage in the preparation of the blend resides in forming thereof, that is to say imparting a shape convenient both for transporting and storing and for charging into a corresponding melting furnace. Thus, granulation, agglomeration and briquetting of dispersed ingredients with the addition of binders have been widely used heretofore (M. A. Nechiporenko, "Pelletizing Fine Concentrates", Leningrad, 1958; L. A. Lurie, "Briquetting in Metallurgy", Moscow, The State Scientific and Technical Institute for Ferrous and Non-Ferrous Metallurgy, 1968; B. M. Ravig, "Briquetting Ores and Ore-Fuel Blends", Moscow, Nedra, 1968).
In a number of cases, it is convenient to form the blend (the charge stock) in the form of pigs from iron-carbon alloys, as a rule from pig iron with the addition thereto of fillers of a required composition, in particular of iron-ore pellets (USSR Inventors' Certificate No. 985063) or ore-carbon pellets (USSR Inventors' Certificate No. 1250582 of Aug. 15, 1986; Bulletin of Inventions Nov. 30, 1986) which in fact represent a semifinished item for metallurgical conversion. Such pigs are prepared in molding boxes of a casting machine filled with pellets from corresponding feeders and cast with pig iron. Here, cooling of a liquid pig iron is carried out at the expense of heating pellets, reducing oxides and heating a mould working surface being exposed to a pig (USSR Inventors' Certificate No. 1105273, which seems to be the closest prior art).
Charging of various melting furnaces with such a stock, i.e. with pigs, appears to be extremely convenient and technologically effective. At the same time, there is a problem of achieving stability of a composition of a given semifinisehd item for metallurgical conversion, which is especially actual for low-volume smeltings, as well as for the preparation of section steels, in particular in oxygen converters and arc furnaces, since the use of half-finished articles with unstable composition and thermal properties does not favour stability of steel-smelting procedures and techniques.
SUMMARY OF THE PRESENT INVENTION
It is, therefore, the principle object of the present invention to create a process for the preparation of a semifinished item for metallurgical conversion in the form of pigs formed in a molding box of a casting machine from a solid filler and a liquid iron-carbon alloy followed by cooling, which provides for stability of a composition of ingredients.
It is another object of the present invention to create a casting machine for the
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Afonin Serafim Zakharovich
Dorofeev Genrikh Alexeevich
Ivashina Evgeniy Nektarievich
Makurov Alexandr Vladimirovich
Panfilov Alexandr Nikolaevich
Aktsionernoe Obschestvo Zakrytogo TIPA "Intermet-Service & Co."
Andrews Melvyn
Garrison David L.
Marquardt Matthew J.
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