EP0286844B1 - Process and apparatus for preparing binder-free firing briquets - Google Patents
Process and apparatus for preparing binder-free firing briquets Download PDFInfo
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- EP0286844B1 EP0286844B1 EP88103979A EP88103979A EP0286844B1 EP 0286844 B1 EP0286844 B1 EP 0286844B1 EP 88103979 A EP88103979 A EP 88103979A EP 88103979 A EP88103979 A EP 88103979A EP 0286844 B1 EP0286844 B1 EP 0286844B1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
Definitions
- the invention relates to a method and a plant for the production of binderless hot briquettes intended for smelting from finely divided, non-flammable non-pyrophoric residues which are produced in the production and processing of iron and steel.
- residues are finely divided dusts, sludges, granules and other substances that contain iron oxides or other metal oxides, such as blast furnace filter dust, oxygen converter filter dust, filter dust from the hall dedusting of steelworks, electric furnace filter dust, steelworks filter sludge, etc. reintroducing them into the production process in order to recover the valuable components contained in the residues; in many cases, however, this is associated with great difficulty or not possible at all because of the nature of the residues, in particular because of the fine particle size. In this case, there is often only the possibility to deposit the residues, which creates environmental protection problems.
- US-A-4 123 209 discloses the hot briquetting of a mixture of iron oxide residues and coal, which is heated in a fluidized bed with the addition of additional fuel and air as the fluidizing gas to the melting point which begins with the briquetting temperature.
- the mixture is preheated before entering the fluidized bed with the help of the finished, hot briquettes, for which additional heat exchange, mixing and separating devices are necessary.
- the invention has for its object to avoid the disadvantages described and to propose a method and an associated system with which residues, which essentially do not contain any combustible components, can be processed into binderless hot briquettes.
- a finely divided fuel is mixed with the finely divided residues.
- This cold mixture is then supplied with sensible heat from the outside until the fuel ignites. Because of the relatively low temperature level, this heat supply can be carried out economically.
- the difficult to set high hot briquetting temperatures of 600 to 900 ° C, however, are achieved by the heat generated when the mixed fuel burns; Since the heat of combustion can be transferred directly to the finely divided residue without major losses, this process step can be carried out economically.
- the heating is carried out either in a fluidized bed / fluidized bed or in a rotary tube.
- the fuels advantageously used such as lignite high-temperature coke, lignite coke, hard coal coke and lignite or hard coal pulp, should have a low ignition temperature (250 to 450 ° C.) to the amount of the outside keep sensible heat supplied as low as possible until the fuel ignites.
- the proportion of fuel in the mixture of residue and fuel which is 2 to 10% by mass and preferably 4 to 6% by mass according to Claim 9, should be such that the fuel is heated before the hot briquetting of the heated residues is largely used up. An excess carbon content is only permissible if the type of fuel used does not adversely affect hot briquetting.
- the amount of fuel added also depends on the calorific value of the fuel and is dependent on the properties of the respective residue, e.g. Water content and specific heat capacity, depending.
- the mixture of finely divided residue and fuel is additionally supplied with heat which can be felt from the outside even after the onset of the combustion of the fuel in order to accelerate the briquetting temperature of 600 to 900 ° C.
- the residues to be briquetted are stored in silos 2.
- the finely divided residue is conveyed to a mixer 4 via a discharge device 3.
- Finely divided fuel is added from a silo 1 via a metering device 5 and mixed in the mixer 4 with the finely divided residue.
- the mixture of fuel and finely divided residue is supplied with heat which can be felt from the outside by a hot oxidizing gas stream 7, which also serves as a fluidizing gas stream.
- the hot oxidizing gas stream 7 is turned off in a combustion chamber 8 Fuel gas 9 and air 10 are generated.
- the finely divided residue After reaching the ignition temperature of the fuel, it reacts with the oxidizing gas stream; As a result of the heat of combustion generated, the finely divided residue is heated up during its migration over the fluidized bed and has hot briquetting temperature at the end of the fluidized bed.
- the heated residue 12 is then fed directly to a briquetting press 13 and pressed into hot briquettes.
- the hot briquettes On a downstream cooling belt 14, the hot briquettes are cooled to ambient temperature by ambient air 15 with the aid of a fan 16.
- the exhaust air generated above the fluidized bed is fed to a dedusting device, not shown, via a blower 11.
- a rotary tube 6a is arranged in place of the fluidized bed 6, into which the hot oxidizing gas stream 7 is introduced.
- the filter dust of example 1 comes from the filter system of a stainless steel plant with an electric furnace and AOD converter, the coarse sludge of example 2 was separated in the filter system of an oxygen steel plant with wet dedusting, and the steel plant dust of example 3 comes from the room dust removal of an oxygen steel plant.
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- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
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Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Anlage zur Herstellung von zur Verhüttung bestimmten bindemittellosen Heißbriketts aus feinteiligen, im wesentlichen keine brennbaren Anteile enthaltenden, nicht-pyrophoren Reststoffen, die bei der Erzeugung und Verarbeitung von Eisen und Stahl anfallen.The invention relates to a method and a plant for the production of binderless hot briquettes intended for smelting from finely divided, non-flammable non-pyrophoric residues which are produced in the production and processing of iron and steel.
Bei diesen Reststoffen handelt es sich um feinteilige Stäube, Schlämme, Granulate und sonstige Stoffe, die Eisenoxide oder sonstige Metalloxide enthalten, wie Hochofenfilterstaub, Sauerstoffkonverterfilterstaub, Filterstaub aus der Hallenentstaubung von Stahlwerken, Elektroofenfilterstaub, Stahlwerksfilterschlämme usw. In der Stahlindustrie wird versucht, die anfallenden Reststoffe wieder in das Erzeugungsverfahren einzuschleusen, um die in den Reststoffen enthaltenen wertvollen Bestandteile zurückzugewinnen; in vielen Fällen ist dies jedoch wegen der Beschaffenheit der Reststoffe, insbesondere wegen der Feinteiligkeit, mit großen Schwierigkeiten verbunden oder überhaupt nicht möglich. Es verbleibt dann vielfach nur die Möglichkeit, die Reststoffe zu deponieren, wodurch Umweltschutzprobleme entstehen.These residues are finely divided dusts, sludges, granules and other substances that contain iron oxides or other metal oxides, such as blast furnace filter dust, oxygen converter filter dust, filter dust from the hall dedusting of steelworks, electric furnace filter dust, steelworks filter sludge, etc. reintroducing them into the production process in order to recover the valuable components contained in the residues; in many cases, however, this is associated with great difficulty or not possible at all because of the nature of the residues, in particular because of the fine particle size. In this case, there is often only the possibility to deposit the residues, which creates environmental protection problems.
Es ist bekannt, übliche Filterstäube unter Zusatz von Bindemitteln zu brikettieren, um auf diese Weise die Wiederverwendung zu ermöglichen, wobei als Bindemittel Stoffe, wie z.B. Bitumen und andere Teerprodukte, Melasse und Sulfitablauge, zum Einsatz kommen. Der Nachteil dieser Bindemittel besteht darin, daß sie durch ihre Abwesenheit die Konzentration der wertvollen Bestandteile im brikettierten Produkt erniedrigen und oft für den nachfolgenden Verarbeitungsprozeß unzulässige Verunreinigungen, wie z.B. Schwefel, einbringen oder Probleme für den Umweltschutz bieten. Da sie in großen Mengen benötigt werden, sind die Kosten, die sich aus dem Preis für das Bindemittel selbst, den Transport- und Lagerkosten sowie eine Reihe anderer Kosten zusammensetzen, beträchtlich, so daß die Wirtschaftlichkeit in Frage gestellt ist.It is known to briquette conventional filter dusts with the addition of binders in order to enable reuse in this way, substances such as e.g. Bitumen and other tar products, molasses and sulfite waste liquor are used. The disadvantage of these binders is that their absence lowers the concentration of the valuable constituents in the briquetted product and often impurities which are impermissible for the subsequent processing process, e.g. Bring sulfur or bring problems for environmental protection. Since they are required in large quantities, the cost, which is composed of the price of the binder itself, the transportation and storage costs as well as a number of other costs, is considerable, so that the economic viability is questioned.
Aus den deutschen Patentschriften 32 23 203 und 35 29 084 sind Verfahren zum Herstellen bindemittelloser Heißbriketts aus Reststoffen bekannt. Nach diesen Verfahren können jedoch nur solche Reststoffe ohne Bindemittel heißbrikettiert werden, die entweder vollständig oder zumindest zum größten Teil aus pyrophorem Material (metallisches Eisen) bestehen; durch Oxidation eines Teils des metallischen Eisens wird die Temperatur des feinteiligen Reststoffes auf 450 bis 650 °C erhöht. In der DE-PS 35 29 084 ist ferner beschrieben worden, bis 15 % der pyrophoren feinteiligen Feststoffe durch Brennstoff zu ersetzen.Methods for producing binderless hot briquettes from residues are known from German patents 32 23 203 and 35 29 084. According to these methods, however, only those residues can be hot-briquetted without binders which either consist entirely or at least largely of pyrophoric material (metallic iron); by oxidizing part of the metallic iron, the temperature of the finely divided residue is increased to 450 to 650 ° C. In DE-PS 35 29 084 it has also been described to replace up to 15% of the pyrophoric particulate solids with fuel.
Für die eingangs beschriebenen Reststoffe, die im wesentlichen keine brennbaren Stoffe enthalten, war die Fachwelt bisher der Auffassung, wie beispielsweise die DE-AS 15 33 827 zeigt, die Heißbrikettiertemperatur durch von außen zugeführte Wärme einzustellen. Eine Heißbrikettiertemperatur im Bereich von 600 bis 900 °C bedingt jedoch, daß die zugehörige Anlage zur Aufheizung der Reststoffe für noch höhere Temperaturen ausgelegt werden muß, wodurch die Anlage teuer und aufwendig wird.For the residues described at the outset, which essentially do not contain any combustible substances, the experts have been of the opinion, as is shown, for example, by DE-AS 15 33 827, of adjusting the hot briquetting temperature by heat supplied from outside. A hot briquetting temperature in the range of 600 to 900 ° C however, requires that the associated plant for heating the residues must be designed for even higher temperatures, which makes the plant expensive and complex.
Aus US-A-4 123 209 ist schließlich das Heißbrikittieren einer Mischung aus Eisenoxid-Restoffen und Kohle bekannt, die in einem Fließbett unter Zufuhr zusätzlichen Brennstoffs und von Luft als Fluidisierungsgas auf die Brikettiertemperatur beginnenden Schmelzens erhitzt wird. Die Mischung wird vor dem Eintritt ins Fließbett mit Hilfe der fertigen, heißen Briketts vorerhitz, wofür zusätzliche Wärmetausch-, Misch- und Trenneinrichtungen notwendig sind.Finally, US-A-4 123 209 discloses the hot briquetting of a mixture of iron oxide residues and coal, which is heated in a fluidized bed with the addition of additional fuel and air as the fluidizing gas to the melting point which begins with the briquetting temperature. The mixture is preheated before entering the fluidized bed with the help of the finished, hot briquettes, for which additional heat exchange, mixing and separating devices are necessary.
Der Erfindung liegt die Aufgabe zugrunde, die beschriebenen Nachteile zu vermeiden und ein Verfahren und eine zugehörige Anlage vorzuschlagen, mit denen auch Reststoffe, die im wesentlichen keine brennbaren Anteile enthalten, zu bindemittellosen Heißbriketts verarbeitet werden können.The invention has for its object to avoid the disadvantages described and to propose a method and an associated system with which residues, which essentially do not contain any combustible components, can be processed into binderless hot briquettes.
Gelöst wird der verfahrensmäßige Teil dieser Aufgabe mit den Merkmalen des Patentanspruchs 1 oder 3.The procedural part of this task is solved with the features of
Beim erfindungsgemäßen Verfahren nach dem Hauptanspruch wird den feinteiligen Reststoffen ein feinteiliger Brennstoff zugemischt. Diesem kalten Gemisch wird dann von außen fühlbare Wärme bis zum Zünden des Brennstoffes zugeführt. Wegen des relativ niedrigen Temperaturniveaus ist diese Wärmezuführung wirtschaftlich durchführbar. Die schwierig einzustellenden hohen Heißbrikettiertemperaturen von 600 bis 900 °C werden dagegen durch die entstehende Wärme beim Verbrennen des zugemischten Brennstoffes erreicht; da die Verbrennungswärme ohne große Verluste direkt auf den feinteiligen Reststoff übertragen werden kann, ist dieser Verfahrensschritt wirtschaftlich durchführbar.In the method according to the main claim, a finely divided fuel is mixed with the finely divided residues. This cold mixture is then supplied with sensible heat from the outside until the fuel ignites. Because of the relatively low temperature level, this heat supply can be carried out economically. The difficult to set high hot briquetting temperatures of 600 to 900 ° C, however, are achieved by the heat generated when the mixed fuel burns; Since the heat of combustion can be transferred directly to the finely divided residue without major losses, this process step can be carried out economically.
Die Erhitzung wird entweder in einem Fließbett/Wirbelbett oder in einem Drehrohr durchgeführt.The heating is carried out either in a fluidized bed / fluidized bed or in a rotary tube.
Vorteilhafte Merkmale des Verfahrens sind in den Ansprüchen 2 und 4 bis 12 erwähnt.Advantageous features of the method are mentioned in
Die vorteilhafterweise verwendeten Brennstoffe, wie Braunkohlenhochtemperaturkoks, Braunkohlenkoks, Steilkohlenkoks und Braun- oder Steinkohlengrus sollten eine niedrige Zündtemperatur (250 bis 450 °C) haben, um die Menge der von außen zugeführten fühlbaren Wärme bis zum Zünden des Brennstoffes möglichst gering zu halten.The fuels advantageously used, such as lignite high-temperature coke, lignite coke, hard coal coke and lignite or hard coal pulp, should have a low ignition temperature (250 to 450 ° C.) to the amount of the outside keep sensible heat supplied as low as possible until the fuel ignites.
Der Anteil an Brennstoff in der Mischung aus Reststoff und Brennstoff, der nach Anspruch 9 2 bis 10 Masse-% und nach Anspruch 10 bevorzugt 4 bis 6 Masse-% beträgt, sollte so bemessen sein, daß vor der einsetzenden Heißbrikettierung der erhitzten Reststoffe der Brennstoff weitgehend verbraucht ist. Ein Überschußkohlenstoffgehalt ist nur dann zulässig, wenn die Art des verwendeten Brenstoffes die Heißbrikettierung nicht nachteilig beeinflußt.The proportion of fuel in the mixture of residue and fuel, which is 2 to 10% by mass and preferably 4 to 6% by mass according to
Die zugesetzte Brennstoffmenge richtet sich ferner nach dem Heizwert des Brennstoffes und ist von den Eigenschaften des jeweiligen Reststoffes, wie z.B. Wassergehalt und spezifischer Wärmekapazität, abhängig.The amount of fuel added also depends on the calorific value of the fuel and is dependent on the properties of the respective residue, e.g. Water content and specific heat capacity, depending.
Bei der Verarbeitung von Filterstäuben aus Sauerstoffaublaskonvertern sollte beachtet werden, daß der verfahrensmäßig bedingte Freikalkgehalt der Stäube 8% nicht überschreitet. Bei höheren Kalkgehalten ist mit einer Zerfallsneigung der Briketts durch Luftfeuchtigkeitsaufnahme und anschließender Hydratisierung zu rechnen. Nur durch deutliche Erhöhung der Brikettiertempertur oder Erhöhung des Walzenpreßdruckes könnten die Nachteile erhöhter Freikalkgehalte ausgeglichen werden. Hierdurch wird allerdings auch die Wirtschaftlichkeit des Verfahrens nachteilig beeinflußt.When processing filter dust from oxygen bubble converters, it should be noted that the process-related free lime content of the dust does not exceed 8%. In the case of higher limescale content, the briquettes are likely to disintegrate due to the absorption of moisture and subsequent hydration. The disadvantages of increased free lime contents could only be compensated for by significantly increasing the briquetting temperature or increasing the roller pressure. However, this also adversely affects the economics of the method.
Nach einer bevorzugten Ausführungsform gemäß Anspruch 12 wird dem Gemisch aus feinteiligem Reststoff und Brennstoff auch nach dem Einsetzen der Verbrennung des Brennstoffes zusätzlich von außen fühlbare Wärme zugeführt, um die Brikettiertemperatur von 600 bis 900 °C beschleunigt zu erreichen.According to a preferred embodiment according to
Vorteilhafte Anlagen zur Durchführung des Verfahrens ergeben sich aus den Ansprüchen 13 und 14.Advantageous systems for carrying out the method result from
Als Vorteil der Erfindung wird angesehen, daß die mit der Verarbeitung von Reststoffen, die im wesentlichen keine brennbaren Anteile enthalten, verbundenen Probleme gelöst werden und diese Reststoffe auf energiesparende Weise auf Heißbrikettiertemperatur gebracht werden können. Weiter ist vorteilhaft, daß relativ preiswerte Brennstoffe eingesetzt werden können und daß die Anlage zur Aufheizung der feinteiligen Reststoffe thermisch weniger belastet wird und dadurch kostengünstiger ausgelegt werden kann.It is considered an advantage of the invention that the problems associated with the processing of residues that contain essentially no flammable components are solved and that these residues can be brought to hot briquetting temperature in an energy-saving manner. Another advantage is that relatively inexpensive fuels can be used and that the system for heating the finely divided residues is thermally less stressed and can therefore be designed more cost-effectively.
Ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens und der erfindungsgemäßen Anlage wird im folgenden anhand der Zeichnung näher beschrieben. Es zeigt
Figur 1- die erfindungsgemäße bindemittellose Heißbrikettierung von Reststoffen unter Zuhilfenahme eines Fließbettes und
Figur 2- die erfindungsgemäße Heißbrikettierung von Reststoffen unter Zuhilfenahme eines Drehrohres.
- Figure 1
- the binderless hot briquetting of residues according to the invention with the aid of a fluidized bed and
- Figure 2
- the hot briquetting of residues according to the invention with the aid of a rotary tube.
Wie Figur 1 zeigt, sind die zu brikettierenden Reststoffe in Silos 2 gespeichert. Über eine Austragsvorrichtung 3 wird der feinteilige Reststoff zu einem Mischer 4 gefördert. Aus einem Silo 1 wird feinteiliger Brennstoff über eine Dosiervorrichtung 5 zugegeben und im Mischer 4 mit dem feinteiligen Reststoff vermischt.As FIG. 1 shows, the residues to be briquetted are stored in
In dem Fließbett 6 wird der Mischung aus Brennstoff und feinteiligem Reststoff durch einen heißen oxidierenden Gasstrom 7, der gleichzeitig als Fluidisierungsgasstrom dient, von außen fühlbare Wärme zugeführt. Der heiße oxidierende Gasstrom 7 wird in einer Brennkammer 8 aus Brenngas 9 und Luft 10 erzeugt.In the fluidized
Nach Erreichen der Zündtemperatur des Brennstoffes reagiert dieser mit dem oxidierenden Gasstrom; durch die entstehende Verbrennungswärme wird der feinteilige Reststoff bei seiner Wanderung über das Fließbett aufgeheizt und besitzt am Ende des Fließbettes Heißbrikettiertemperatur. Anschließend wird der aufgeheizte Reststoff 12 unmittelbar einer Brikettierpresse 13 zugeführt und zu Heißbriketts gepreßt. Auf einem nachgeschalteten Kühlband 14 werden die Heißbriketts durch Umgebungsluft 15 mit Hilfe eines Ventilators 16 auf Lagertemperatur abgekühlt. Die über dem Fließbett entstehende Abluft wird über ein Gebläse 11 einer nicht dargestellten Entstaubung zugeführt.After reaching the ignition temperature of the fuel, it reacts with the oxidizing gas stream; As a result of the heat of combustion generated, the finely divided residue is heated up during its migration over the fluidized bed and has hot briquetting temperature at the end of the fluidized bed. The heated
Gemäß Figur 2 ist anstelle des Fließbettes 6 ein Drehrohr 6a angeordnet, in welches der heiße oxidierende Gasstrom 7 eingeleitet wird.According to Figure 2, a rotary tube 6a is arranged in place of the fluidized
Die in der folgenden Tabelle zusammengestellten Werte dienen der weiteren Erläuterung der Erfindung:
Der Filterstaub des Beispiels 1 stammt aus der Filteranlage eines Edelstahlwerkes mit Elektroofen und AOD-Konverter, der Grobschlamm des Beispieles 2 wurde in der Filteranlage eines Oxygenstahlwerkes mit Naßentstaubung abgeschieden und der Stahlwerksstaub des Beispieles 3 stammt aus der Raumentstaubung eines Oxygenstahlwerks.The filter dust of example 1 comes from the filter system of a stainless steel plant with an electric furnace and AOD converter, the coarse sludge of example 2 was separated in the filter system of an oxygen steel plant with wet dedusting, and the steel plant dust of example 3 comes from the room dust removal of an oxygen steel plant.
Claims (14)
- A process for producing binder-free hot briquettes intended for smelting and consisting of finely particulate non-pyrophoric residual substances which contain substantially no combustible components and which accumulate during the production and processing of iron and steel, whereina) fuel is admixed in finely divided form with the residual substances in a separate mixer,b) the mixture of residual substances and fuel formed in the mixture is transferred to a fluidized bed, and an appropriate quantity of perceptible heat is supplied from outside the mixture via a hot oxidizing gas flow simultaneously acting as a fluidizing gas flow until the fuel ignites, and after the ignition point has been reached the fuel is burnt by means of the hot oxidizing gas flow, a quantity of fuel being added such that the temperature of the residual substance reaches the range of 600 to 900°C, andc) immediately after leaving the fluidized bed the heated residual substances are hot-briquetted at a temperature in the aforementioned range, and the hot briquettes produced are then cooled on a cooling belt, but without using the perceptible heat of the hot briquettes in heat exchangers.
- A process according to claim 1, characterized in that the dwell time of the mixture of residual substance and fuel in the fluidized bed is 5 to 30 minutes.
- A process for producing binder-free hot briquettes intended for smelting and consisting of finely particulate non-pyrophoric residual substances which contain substantially no combustible components and which accumulate during the production and processing of iron and steel, whereina) fuel is admixed in finely divided form with the residual substances in a separate mixer,b) the mixture of residual substance and fuel is transferred to a rotary tube, and an appropriate quantity of perceptible heat is supplied from outside to the mixture via a hot oxidizing gas blown into the rotary tube until the fuel ignites, and after the ignition point has been reached the fuel is burnt by means of the oxidizing gas flow, a quantity of fuel being added such that the temperature of the residual substance reaches the range of 600 to 900°C, andc) immediately after leaving the rotary tube the heated residual substances are hot-briquetted at a temperature in the aforementioned range, and the hot briquettes produced are then cooled on a cooling belt, but without using the perceptible heat of the hot briquettes in heat exchangers.
- A process according to claim 3, characterized in that the dwell time of the mixture of residual substance and fuel in the rotary tube is 5 to 30 minutes.
- A process according to claims 1 or 3, characterized in that lignite and/or pit coal in the form of coke and slack are used as fuels which are mixed with the residual substances in a separate mixer.
- A process according to claim 5, characterized in that the grain size of the fuels used is up to 5 mm.
- A process according to claim 5, characterized in that the grain size of the fuels used is 0.5 to 1.5 mm.
- A process according to claims 1 or 3 3, characterized in that the proportion of fuel in the mixture of residual substance and fuel is 2 to 10% by weight.
- A process according to claim 8, characterized in that the proportion of the fuel is 4 to 6% by weight.
- A process according to claims 1 or 3, characterized in that the grain size of the finely particulate residual substances is up to 5 mm.
- A process according to claim 10, characterized in that the grain size of the finely particulate residual substances is smaller than 1 mm.
- A process according to claims 1 or 3, characterized in that even after the start of the combustion of the fuel, extra perceptible heat is supplied from outside to the mixture of finely particulate residual substance and fuel in the fluidized bed or the rotary tube, to reach the briquetting temperature of 600 to 900°C more quickly.
- An installation for the performance of the process according to claim 1, substantially comprising the following parts:- a separate mixer (4),- a fluidized bed (6),- a separate combustion chamber (8) to produce a hot oxidizing gas flow with a supply pipe to the fluidized bed,- a briquetting press (13) and- a cooling belt, but without a heat exchanger for using the perceptible heat of the hot briquette.
- An installation for the performance of the process according to claim 3, substantially comprising the following parts:- a separate mixer (4),- a rotary tube (6a),- a separate combustion chamber (8) to produce a hot oxidizing gas flow with a supply line to the rotary tube,- a briquetting press (13) and- a cooling belt, but without heat exchangers for using the perceptible heat of the hot briquette.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88103979T ATE69270T1 (en) | 1987-04-02 | 1988-03-14 | PROCESS AND PLANT FOR THE MANUFACTURE OF BINDER-FREE HOT BRIQUETTES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3711130A DE3711130C1 (en) | 1987-04-02 | 1987-04-02 | Process and plant for the production of binderless hot briquettes |
| DE3711130 | 1987-04-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0286844A1 EP0286844A1 (en) | 1988-10-19 |
| EP0286844B1 true EP0286844B1 (en) | 1991-11-06 |
Family
ID=6324722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88103979A Expired - Lifetime EP0286844B1 (en) | 1987-04-02 | 1988-03-14 | Process and apparatus for preparing binder-free firing briquets |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4872906A (en) |
| EP (1) | EP0286844B1 (en) |
| JP (1) | JPS63262427A (en) |
| KR (1) | KR880012779A (en) |
| AT (1) | ATE69270T1 (en) |
| DE (2) | DE3711130C1 (en) |
| ES (1) | ES2027717T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5104446A (en) * | 1989-09-29 | 1992-04-14 | Iron Tiger Investment Inc. | Agglomeration process |
| BE1010700A5 (en) † | 1996-10-17 | 1998-12-01 | Trading And Recycling Company | METHOD FOR PROCESSING stainless steel slags. |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1009397B (en) * | 1953-04-23 | 1957-05-29 | F J Collin Ag Zur Verwertung V | Process for the refining of fine ores or metal oxides |
| BE646000A (en) * | 1963-04-10 | |||
| GB1096315A (en) * | 1964-03-20 | 1967-12-29 | Coal Industry Patents Ltd | Briquettes composed of inorganic compounds and carbonaceous material |
| ES340602A1 (en) * | 1966-05-17 | 1968-06-01 | Boliden Ab | A method of Converting a Finely-Grained Material to a more Coarsely-Grained Material |
| US3941582A (en) * | 1969-06-12 | 1976-03-02 | Baum Jesse J | Direct reduced iron |
| US3870507A (en) * | 1973-05-14 | 1975-03-11 | Ferro Carb Agglomeration | Control of pollution by recycling solid particulate steel mill wastes |
| LU70523A1 (en) * | 1974-07-12 | 1976-05-31 | ||
| US4123209A (en) * | 1977-04-18 | 1978-10-31 | Moore James E | Briquetting plant |
| DE2852964A1 (en) * | 1978-12-07 | 1980-06-26 | Krupp Polysius Ag | METHOD AND SYSTEM FOR REDUCING ORES |
| DE3223203C1 (en) * | 1982-06-22 | 1983-12-29 | Thyssen AG vorm. August Thyssen-Hütte, 4100 Duisburg | Process and plant for the production of binderless hot briquettes |
| LU85116A1 (en) * | 1983-12-06 | 1985-09-12 | Laborlux Sa | METHOD FOR HOT BRIQUETTING FINE GRAIN MATERIALS AND FOR PROCESSING THE HOT BRIQUETTES |
| DE3529084C1 (en) * | 1985-08-14 | 1986-10-16 | Thyssen Stahl AG, 4100 Duisburg | Process and plant for the production of binderless hot briquettes |
| LU86070A1 (en) * | 1985-09-09 | 1987-04-02 | Laborlux Sa | METHOD FOR PROCESSING ZINC AND LEAD-CONTAINING RESIDUES FROM THE STEEL INDUSTRY WITH REGARD TO METALLURGICAL PROCESSING |
-
1987
- 1987-04-02 DE DE3711130A patent/DE3711130C1/en not_active Expired
-
1988
- 1988-03-14 AT AT88103979T patent/ATE69270T1/en not_active IP Right Cessation
- 1988-03-14 DE DE8888103979T patent/DE3865999D1/en not_active Expired - Fee Related
- 1988-03-14 EP EP88103979A patent/EP0286844B1/en not_active Expired - Lifetime
- 1988-03-14 ES ES198888103979T patent/ES2027717T3/en not_active Expired - Lifetime
- 1988-03-16 US US07/168,708 patent/US4872906A/en not_active Expired - Fee Related
- 1988-03-31 JP JP63076633A patent/JPS63262427A/en active Pending
- 1988-04-02 KR KR1019880003740A patent/KR880012779A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| ATE69270T1 (en) | 1991-11-15 |
| JPS63262427A (en) | 1988-10-28 |
| US4872906A (en) | 1989-10-10 |
| EP0286844A1 (en) | 1988-10-19 |
| ES2027717T3 (en) | 1992-06-16 |
| DE3711130C1 (en) | 1988-07-21 |
| DE3865999D1 (en) | 1991-12-12 |
| KR880012779A (en) | 1988-11-29 |
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