Abstract:
Zum Aufarbeiten von metalloxidhältigen Stäuben oder Schlacken mit einem beheizten säulenförmigen Koksbett, aus welchem Reaktionsgase abgezogen und am Fuß Schmelze abgestochen werden, wird das säulenförmige Koksbett in einem ersten Teilbereich seiner axialen Länge als beheizter Koksring um eine zentrale Aufgabeöffnung angeordnet. Die Aufgabe der festen Stäube oder der Schmelze wird unterhalb der Aufgabeebene für Koks in den Koksring in das heiße Koksbett vorgenommen. Die Vorrichtung zeichnet sich dadurch aus, dass am kopfseitigen Ende ein zentraler Aufgaberaum (4) für die Charge ausgebildet ist, der von einem Ringraum (5) für die Aufnahme von Koks umgeben ist, dass an den Koks-Ringraum (5) Düsen (9) für Heißwind, Sauerstoff und/oder heiße Verbrennungsabgase sowie ggf. Brennstoffe angeschlossen sind, dass der Koks-Ringraum (5) an seinem kopfseitigen kalten Ende eine druckfeste Schleuse (3) aufweist und dass an den Reaktor (1) an oder unterhalb der ünterkante des Koks-Ringraums (5) Absaugleitungen (13,14) für Reaktionsgase angeschlossen sind.
Abstract:
The subject matter of the invention is an aggregate and/or filler extracted from slag, a method for the production thereof, and the use thereof. According to the invention, a recyclate extracted from metal or metal slag having less than 1% by wt. of free CaO or less than 1% by wt. of nitrides (for almuinium slag) is provided. Said method for producing the recyclate, substantially converts metal slag with additives containing iron sulphate.
Abstract:
Method for breaking down steel slag blocks, which are obtained by the making of iron and steel from ore and which have the form of a hardened mixture of iron and slags, comprising the following steps: - provision of a static collision means, - hoisting of a steel slag block (skull) or portion thereof, - allowing said steel slag block or portion thereof to fall under the influence of gravity onto said collision means, - shattering of at least a part of said steel slag block or portion thereof as a result of the collision forces.
Abstract:
Bei einem Verfahren zum Reduzieren von metalloxidischen Schlacken bzw. Gläsern und/oder Entgasen von mineralischen Schmelzen werden feste Partikel und/oder Schmelzen auf ein zumindest teilweise induktiv erhitztes Bett oder eine Säule mit stückigem Koks aufgegeben und die ablaufende reduzierte und/oder entgaste Schmelze wird gesammelt. Die Vorrichtung zum Reduzieren von metalloxidischen Schlacken bzw. Gläsern und/oder Entgasen von mineralischen Schmelzen mit einer Aufgabeöffnung (1) für festes oder schmelzflüssiges Material und einer Abstichöffnung (12) für die behandelte Schmelze ist gekennzeichnet durch ein röhr- oder rinnenförmiges Gehäuse (3) für die Aufnahme von stückigem Koks (6), und eine das Gehäuse (3) umgebende, wenigstens eine Induktionsspule (7, 8, 9) enthaltende Heizeinrichtung.
Abstract:
A method for recovering stainless steel from a waste stream of slags formed during the production of stainless steel under dry conditions, comprising the steps of crushing at least part of the waste stream of slags under substantially dry conditions in a primary crushing circuit to form a primary crushed fraction of waste pieces comprising stainless steel-containing scrap pieces which have been released from the slags, screening the primary crushed fraction to produce at least a primary coarse and fine subfraction, recovering stainless steel-containing scrap pieces from the primary coarse subfraction with the aid of a sensor separator, the sensor separator measuring properties of the waste pieces guided past it, in particular attenuation of inductances thereof, and the sensor separator actuating blowing nozzles as a function of the measured value in order to blow relevant stainless steel-containing scrap pieces out of the primary coarse subfraction guided past the sensor separator. Immediately after the sensor separation, slag pieces which still contain stainless steel are selected so as to be separated from slag pieces which do not contain stainless steel, by means of a neodymium magnet. The stainless steel-containing slag pieces pass through to the crushing circuit for the further release of stainless steel. The slag which does not contain stainless steel is then immediately an end product.
Abstract:
A dross compression apparatus (1) and method includes one or more air nozzles (22) for directing cooling air across the top of a compression head (2) for cooling the compression head. The air may be vented through air vents (18) in a wall (19) of the apparatus after passing across the top of the compression head. Also a plurality of ribs (10) may extend across the top of the compression head in the direction of the air vents in the wall of the apparatus for directing the air across the top of the compression head and out the air vents.
Abstract:
The present invention refers to a method and respective apparatus for the recovery of the free metal present in hot dross which is produced when non-ferrous metals are processed at temperatures above their melting point. The method consists of charging the hot dross collected from the liquid bath surface of holding or melting furnaces, directly into an equipment provided with thermal insulation and means for control of its internal atmosphere. This operation is followed by the transportation of such an equipment to a processing unit located not far from the site were the dross has been generated. The processing unit being provided with transfer devices and one or more sealed rotary furnaces provided with controlled atmosphere, which work in the accumulation and agitation of the dross, and the subsequent separation of the free metal contained therein. The equipment used in the recovery of non-ferrous metals present in dross, object of the present invention, consists of a recipient provided with thermally insulated walls, and a cover also thermally insulated that is well adjusted to the body of the recipient, and is provided with an inert gas injection port, a lifting and transfer device for removing the dross from the recipient into a feeding device well adjusted to the door of a sealed furnace that acts both as a dross accumulator and in the free metal separation from dross.
Abstract:
Disclosed herein is a method for recovering useful metals from a slag generated in a steel-making process while treating the slag. The method comprises dropping a molten slag to a horizontally blowing air stream while spraying water to the slag. The slag treated according to the present invention is a chemically stable spheroid which can be reclaimed by being sorted depending on the size.
Abstract:
The invention concerns a method for the production of pozzolanic or hydraulic binders for the cement industry from basic oxidic slags, especially steel slags, using a metal bath for reducing metal oxides in the slags. According to said method, the basicity of the liquid slags is adjusted, prior to reduction, to a value that is 0.1 to 0.5 lower than the basicity value (Ca0/Si02) of the target slag by adding acid correction materials such as silica sand and/or blast furnace slag and/or correction materials containing SiO2.
Abstract:
The invention relates to a method for the utilisation of synthetic material in the thermal treatment of metalliferous recyclings in a multi-level furnace which is partitioned into three zones. Each zone is provided with several levels one on top of the other. The inventive method comprises the following steps: continually introducing the metalliferous recyclings into the top level of the first zone pertaining to the multi-level furnace, whereby the recyclings are gradually transferred to the second zone and are dried in the meantime; heating and calcining the recyclings at approximately 800 DEG C within the second zones, whereby the recyclings are gradually transferred to the third zone; continually introducing synthetic material to the top level of the third zone and heating the mixture to 1,000 DEG C to 1,200 DEG C in the third zone, whereby the metals are reduced; withdrawing the mixture from the multi-level furnace.