Method of processing iron-containing mettalurgical residual substances as well as arrangement for carrying out said method
AssigneeVoest-Alpine Industrieanlagenbau GmbH
InventorsJohann Lehner, Gunter Schrey
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Abstract
In a method of processing iron-containing metallurgical residual substances, offgases containing iron-containing particles are washed out in a wet process and separated in the form of sludge. The sludge is then dehydrated and agglomerated; subsequently, the agglomerates are recycled into an iron melt production process. To recover the iron contained in the sludge, the agglomerates are passed exclusively into a refining stage of the steel production process. The present method may be used in a steel production process which produces steel from pig iron, as well as optionally from scrap and/or iron ore and/or sponge iron. The refining stage is performed using an oxygen blowing process.
Claims22
A method of processing iron-containing metallurgical residual substances which have been washed out from offgases containing said iron-containing metallurgical residual substances in a steel production process, said method comprising the steps of:
- collecting said iron-containing metallurgical residual substances from said offgases using a wet process;
- separating said iron-containing metallurgical residual substances from said offgases in the form of a sludge;
- dehydrating said sludge;
- agglomerating said sludge by mixing said sludge with quick lime after dehydration to bind said sludge, and subsequently granulating the resulting mixture to form granulates;
- and
- recycling said granulates in a steel production process by passing said granulates into a refining stage of said steel production process, said refining stage being performed using an oxygen blowing process.
A method of processing iron-containing metallurgical residual substances recovered from offgases containing said iron-containing metallurgical residual substances in a steel production process, said method comprising the steps of:
- obtaining a sludge of said iron-containing metallurgical residual substances using wet process;
- dehydrating said sludge;
- agglomerating said sludge to form agglomerates of said iron-containing substances;
- and
- recycling said sludge in said steel production process by passing said agglomerates into a refining stage of said steel production process, said refining stage being performed using an oxygen blowing process.
Dependencies are inferred from the claim text.