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US 2006/0065071 A1Published application
Method for utilizing slag
AssigneeVoest-Alpine Industrieanlagenbau GmbH
InventorsAlexander Fleischanderl, Udo Gennari
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AssigneeVoest-Alpine Industrieanlagenbau GmbH
InventorsAlexander Fleischanderl, Udo Gennari
Estimating the term…
In a process for utilizing slag containing oxidic iron particles, adding a reducing agent and reducing oxidic iron particles of the slag are charging the slag into a reactor vessel onto a residual iron metal containing dissolved carbon, slowly and continuously over an extended period of time, electric heating the slag and the iron melt over an extended period of time, injecting a carbon-containing reducing agent with inert gas over an extended period of time by a lance into a region close to the boundary surface between the slag and the iron melt or directly into the iron melt, dissolving the carbon of the reducing agent in the iron melt and reducing oxidic iron particles of the slag with metallic iron and CO being formed, over an extended period of time, forming a foamed slag by the resulting CO over an extended period of time, introducing an oxygen-containing gas or oxygen into the foamed slag and postcombustion of CO to CO2 over an extended period of time, bottom flushing the reactor vessel with inert gas over an extended period of time, discharging the treated slag and optionally subsequently the discharging iron melt, whereby a residual iron melt containing dissolved carbon is left in the reactor vessel.
(canceled)
A process according to claim 26, further comprising slow and continuous injection of metallurgical residual materials with gas over an extended period of time by means of a lance, into a region close to the boundary surface between the slag and the iron metal or directly into the iron melt, with the iron melt and the slag being mixed.
A process according to claim 26, further comprising slow and continuous injection of auxiliary agents via gas over an extended period of time by means of a lance, into a region close to the boundary surface between the slag and the iron melt or directly into the iron melt (25), whereby the iron melt and the slag are mixed.
A process according to claim 26, wherein process steps are carried out over an extended period of time from a discharging of the slag and optionally discharging of the iron melt until a subsequent discharging of the slag and thus essentially synchronously.
A process according to claim 26, wherein the carbon-containing reducing agent is injected for so long until a maximum saturation limit of carbon has been reached in the iron melt.
A process according to claim 26, wherein the oxygen-containing gas is introduced into the upper half of the height of the slag.
A process according to claim 27, wherein the lance has lateral discharge openings, and substances to be injected are injected via the lateral discharge openings of the lance in an approximately horizontal direction or slightly transversely toward an idealized flat boundary surface.
A process according to claim 26, wherein the heating is electric heating effected via an electric arc or resistance heating.
A process according to claim 26, wherein the slag is charged at least partially in a liquid form.
A process according to claim 26, wherein the metal oxides are reduced primarily via direct reduction by the carbon dissolved in the metal melt.
A process according to claim 26, further comprising using reducing agents which are stronger than carbon in the final stage of reduction prior to the discharging of the treated slag.
A process according to claim 26, further comprising, adding auxiliary agents for conditioning the slag properties upon completion of the addition of reducing agents.
A process according to claim 26, further comprising adding iron-oxide containing ores.
A process according to claim 26, further comprising measuring a height of the slag and correcting the height of the slag if a maximum admissible height is exceeded and a limiting value of the slag height is fallen short of.
A process according to claim 26, wherein the the slag is treated in the reactor vessel at a lower temperature than for the granulation of the treated slag.
20-25. (canceled)
A process for utilizing slag from iron smelting and steel making, wherein the slag contains oxidic iron particles and optionally other metal oxides, which are combined with a reducing agent for reduction thereby, the process comprising:
An installation for utilizing slag from iron smelting and steel making, comprising:
Dependencies are inferred from the claim text.