DE953614C - The use of red mud as an aggregate in wind refining of melts, e.g. B. in the Thomas converter - Google Patents
The use of red mud as an aggregate in wind refining of melts, e.g. B. in the Thomas converterInfo
- Publication number
- DE953614C DE953614C DEM22876A DEM0022876A DE953614C DE 953614 C DE953614 C DE 953614C DE M22876 A DEM22876 A DE M22876A DE M0022876 A DEM0022876 A DE M0022876A DE 953614 C DE953614 C DE 953614C
- Authority
- DE
- Germany
- Prior art keywords
- red mud
- melts
- converter
- aggregate
- wind
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
Die Verwendung von Rotschlamm. als Zuschlagstoff beim Windfrischen von Schmelzen, z. B. im Thomas-Konverter Es wurde gefunden, daß beim Windfrischen von Schmelzen, z. B. im Thomas-Konverter, an Stelle der üblichen und bekannten eisenhaltigen Zuschlagstoffe, wie Schrott und Erz, ganz oder teilweise Rotschlamm verwendet werden kann. Rotschlamm ist ein Nebenprodukt der Tonerdegewinnung aus stark eisenhaltigen Bauxiten. Er hat etwa folgende Zusammensetzung: 4o % Feuchtigkeit, 32% Fe203, 1:2%, A1203, 4 ?/o Kristallwasser, 2,5.'/o S'021 q.0/0 T' 02, 2 % Na2 O, I % Ca O und geringe Gehalte an Mg0, S03, P205, V205 und sonstigen Verunreinigungen; seine Nutzbarmachung bildet eine stete Sorge der Aluminium-Industrie. Bis heute hat der Rotschlamm eine -wirtschaftlich bedeutende Verwendung nicht gefunden, wovon die Riesenhalden der Aluminiumwerke zeugen. Man hat zwar schon versucht, diese Rückstände zur Gewinnung der in ihnen enthaltenen Metalloxyde, insbesondere des Eisens, unter Beimischung von anderen Stoffen aufzuarbeiten oder den Rotschlamm in getrocknetem Zustand, in gepreßter Form oder mit gesintertem Feinerz zusammen als Zuschlag in den Hochofen einzublasen bzw. zuzugeben, ohne ihn damit einer wirklichen wirtschaftlichen Verwertung zuführen oder die Haldenbestände wesentlich verringern zu können.The use of red mud. as an additive in wind freshening of melts, e.g. B. in the Thomas converter It was found that when wind freshening of melts, e.g. B. in the Thomas converter, instead of the usual and well-known ferrous ones Aggregates such as scrap and ore, in whole or in part, red mud can be used can. Red mud is a by-product of the extraction of alumina from high iron content Bauxites. It has roughly the following composition: 40% moisture, 32% Fe203, 1: 2%, A1203, 4? / O water of crystallization, 2.5. '/ O S'021 q.0 / 0 T'02, 2% Na2O, 1% CaO and low contents of Mg0, S03, P205, V205 and other impurities; its utilization is a constant concern of the aluminum industry. To this day, the red mud has one - economically significant use not found, of which the giant heaps of the Aluminum works testify. Attempts have already been made to extract these residues the metal oxides contained in them, especially iron, with admixture of other substances or the red mud in a dried state, in pressed form or with sintered fine ore together as aggregate in the blast furnace to blow in or to admit, without thereby real economic exploitation or to be able to significantly reduce the stockpiles.
Der Rotschlamm soll gemäß Erfindung vorzugsweise in getrockneter, poröser, stückiger Form vor Blasebeginn in den Konverter gegeben werd:. Dabei wurde beobachtet, daß ein besonderes Aufschäumen der Schlacke während der Entkohlungsperiode nicht einträt. Während des Frischvorganges, besonders in der-zweiten Hälfte der Entkohlungsperiode, soll der Rotschlamm vorzugsweise in Form von Briketts oder als Sintergut zugesetzt werden.According to the invention, the red mud should preferably be in dried, porous, lumpy form is placed in the converter before the start of the blowing. It was observed that a particular foaming of the slag during the decarburization period does not occur. During the freshening process, especially in the-second Half of the decarburization period, the red mud should preferably be in the form of briquettes or added as sintered material.
Es wurde ferner festgestellt, daB bei Verwendung von Rotschlamm die Thomasschlacke eine Erhöhung ihres Gehalts an zitronensäurelöslicher Phosphorsäure erfuhr.It was also found that when using red mud the Thomas slag increased its content of citric acid-soluble phosphoric acid learned.
Die zugegebenen Mengen an Rotschlamm richten sich einerseits nach seiner Zusammensetzung, andererseits nach den vorliegenden Roheisen, und Konverterverhältnissen und können 15 bis 5o kg/t Roheisen betragen.The added amounts of red mud depend on the one hand its composition, on the other hand according to the available pig iron, and converter ratios and can be 15 to 50 kg / t pig iron.
Dem Rotschlamm können in gesinterter oder brikettierter Form Zusatzstoffe, wie Kalk, Feinerz od. dgl., und/oder Bindemittel, - wie Pech, Teer od. ä., zugesetzt sein.In sintered or briquetted form, additives can be added to the red mud, such as lime, fine ore or the like, and / or binders, such as pitch, tar or the like, added be.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM22876A DE953614C (en) | 1954-04-28 | 1954-04-28 | The use of red mud as an aggregate in wind refining of melts, e.g. B. in the Thomas converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM22876A DE953614C (en) | 1954-04-28 | 1954-04-28 | The use of red mud as an aggregate in wind refining of melts, e.g. B. in the Thomas converter |
Publications (1)
Publication Number | Publication Date |
---|---|
DE953614C true DE953614C (en) | 1956-12-06 |
Family
ID=7298878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEM22876A Expired DE953614C (en) | 1954-04-28 | 1954-04-28 | The use of red mud as an aggregate in wind refining of melts, e.g. B. in the Thomas converter |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE953614C (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE823146C (en) * | 1949-06-25 | 1951-11-29 | J Heinrich Gerdemann Fa | Recycling of red mud |
-
1954
- 1954-04-28 DE DEM22876A patent/DE953614C/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE823146C (en) * | 1949-06-25 | 1951-11-29 | J Heinrich Gerdemann Fa | Recycling of red mud |
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