Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1995-08-29
1996-09-24
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75540, 75962, 266162, C21C 530
Patent
active
055586953
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to metallurgy, more specifically to the production of metal in continuous action units.
This invention can be used to most advantage for producing steel and ferroalloys.
PRIOR ART
At present work in the field of metallurgy is directed at developing and up-dating the construction of units and processes of continuously refining metals which display considerable advantages over conventional cyclic processes. There have been developed units of various designs, types and principles of continuous metal production: hearth flow-type, channeled, jet refinement, to mention just a few /1/.
In the prior art process of flow-type continuous metal refinement /2/, liquid iron and slag-forming materials are continuously delivered to unit while finished metal, slag and gas are removed via special channels. Given this method of processing, the refining rates are not high because of the small surfaces of phases contact and the small specific consumption of oxidizers.
An attempt to achieve the high rates of refinement by increasing the surfaces of contact of gaseous oxygen with metal is the development of jet refining type units 131. In the processes, metal is dispersed, using gas, into droplets which interact during the contact with an oxidizer. The resulting stream of metal droplets is fed to a ladle.
However, this process of metal processing yields a high melting loss of elements which results in a low output of molten metal and a high dusting of waste gases, and more importantly, the possibility is limited of re-processing production waste materials and solid oxidizers because of combining the processes in space and time and the impossibility of flexibly controlling the refining processes and metal heating.
There have been developed a process for continuously refining metal and a unit for realizing thereof, in which the metal is subjected to two stage processing /4/.
The conventional process comprises the steps of introducing iron into a reaction chamber, using an oxidizing agent with the additives of bulk materials, completely converting the metal and slag into a foamy emulsion, withdrawing the emulsion to a refining sump and subsequently separating the metal, slag and gas therein.
The prior art unit which implements the process comprises a reaction chamber with channels for the delivery of iron and bulk materials and with a device for feeding gaseous oxygen, a refining sump with tap holes for withdrawing metal and slag and with a branch for taking gases off, and connection channel for discharging the foamy emulsion from the reaction chamber into the refining sump.
However, these process and device do not allow one to achieve the high rates of oxidizing refinement processes, have considerable iron loss, a low degree of waste utilization and a high dusting of waste gases. The low rates of refining processes and their depth of course are explained by the fact that reactions proceed under an atmospheric pressure in a region close to equilibrium, and the specific surface of contact of the phases when the "top blast" interacts with the bath, is of a small value, less than in jet refinement. Besides, transportation of the products from the reaction chamber to the refining sump by dint of free overflow results in that the surface of contact between the metal and slag in the refining sump is reduced sharply and, along with this, the rates of refining processes. Metal loss occurs with a tap cinder in the form of ferric oxides and tiny droplets, and also with a melting loss in the form of brown smoke arising in interaction of the bath and oxygen, and the formation of a high temperature zone. This factor is simultaneously the main reason behind the high dusting of waste gaseous products which are not practically refined in the unit because they contact the foamy emulsion and pass through the emulsion layer only when they are withdrawn from the reaction chamber into the refining sump. A low degree of waste utilization is explained by the high consumption of iron, the method of
REFERENCES:
patent: 3565605 (1971-02-01), Vayssiere
patent: 4037043 (1977-07-01), Segsworth
patent: 5286273 (1994-02-01), Nabi
Aizatulov Rafik S.
Kustov Boris A.
Mikheev Nikolai I.
Mochalov Sergei P.
Shakirov Kim M.
Aktsionernoe Obschestvo Otkrytogo Tipa
Andrews Melvyn
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