DE278105C

DE278105C -

Info

Publication number: DE278105C
Application number: DENDAT278105D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Die Erfindung betrifft ein Verfahren zur Herstellung von Briketts aus mulmigen Erzen, Gichtstaub und jedweden feinen Mineralien und Abfallprodukten und besteht darin, daß die zur Verwendung gelangenden Stoffe mit kalzinierter Phosphatkreide und mit oder ohne Zusatz von gebranntem Kalk in mäßig feuchtem Zustand brikettiert werden.The invention relates to a method for the production of briquettes from queasy ores, Gout dust and any fine minerals and waste products and is that the substances used with calcined phosphate chalk and with or without Adding quicklime can be briquetted in a moderately moist state.

Es sind bereits früher Phosphate bzw. freieThey are phosphates or free ones even earlier

ίο Phosphorsäure als Bindemittel vorgeschlagen . worden, so z. B. Thomasschlackenmehl in unveränderter Form, wobei an die bindende Kraft des freien Kalkes desselben gedacht worden ist. Der hohe Marktpreis der Thomasschlacke ist jedenfalls hindernd für die Verwendung als billiges Bindemittel; sodann enthält sie nur wenig freien Kalk, so daß von der bindenden Kraft desselben keine Rede sein kann.ίο Phosphoric acid suggested as a binder . been, so z. B. Thomas slag powder in unchanged form, with the binding force its free lime has been thought of. The high market price of Thomas slag is in any case a hindrance to the use as a cheap binder; then it only contains little free lime, so that there can be no question of its binding force.

Es ist weiter bekannt, daß kieselsäurereiche Eisenschlacken verschiedener Art, wie Schweiß-, Puddel-, Martinofenfrischschlacken usw. durch bekannte Einwirkung von gespanntem Wasserdampf ev. unter Zusatz von geringen Kalkmengen aufgeschlossen zur Herstellung von Briketts aus staubförmigen Eisenerzen verwendet werden sollen, derart, daß durch nochmalige Einwirkung von gespanntem Wasserdampf das in den Briketts enthaltene Feinerz mit den zugesetzten Schlacken eine Eisen-Kieselsäureverbindung eingehen soll, wodurch der für die Brikettierung von Feinerzen nötige mechanische Zusammenhang der ursprünglichen Mischung erreicht werden soll.It is also known that high-silica iron slags of various types, such as welding, Fresh puddle slag, Martin furnace slag, etc. through the known action of pressurized water vapor possibly opened with the addition of small amounts of lime for the production of Briquettes from powdered iron ores should be used in such a way that by repeated Under the effect of pressurized water vapor, the fine ore contained in the briquettes and the added slag form an iron-silicic acid compound should be included, whereby the mechanical connection necessary for the briquetting of fine ores is the original Mixture is to be achieved.

Daß bei diesem Verfahren der zufällige Phosphorsäuregehalt keinen Einfluß auf die Briketts haben kann, geht daraus hervor, daß Schweißschlacke nur wenige Zehntel Prozent Phosphorsäure enthält.That in this process the incidental phosphoric acid content has no influence on the Briquettes can have, it can be seen from the fact that welding slag is only a few tenths of a percent Contains phosphoric acid.

Ferner sind genannte Schlacken auch infolge ihrer stückigen Beschaffenheit direkt verhüttbar und stehen dementsprechend 'hoch im Preise.Furthermore, the slag mentioned can also be smelted directly due to its lumpy nature and are accordingly 'high in prices.

Auch ist das Behandeln des Bindemittels bzw. der fertigen Briketts mit gespanntem Wasserdampf mit so hohen Kosten verknüpft, daß mit einer wirtschaftlichen Herstellung von Briketts nach diesem Verfahren nicht zu rechnen ist.The binding agent or the finished briquettes are also treated with tensioned Water vapor is so costly that it can be produced economically of briquettes after this process is not to be expected.

Bei diesen beiden Verfahren werden der Phosphorsäure bzw. deren Eisen- und Kalk-Verbindungen keinerlei bindende Eigenschaften zugeschrieben und können solche auch nicht zugeschrieben werden.In these two processes the phosphoric acid or its iron and lime compounds no binding properties whatsoever and cannot be assigned.

Bei dem vorliegenden Verfahren zur Brikettierung von feinen Erzen, Gichtstaub u. dgl. ist die bindende Kraft des in der Phosphatkreide enthaltenen Tricalciumphosphates nicht dem Phosphorsäuregehalt desselben zuzuschreiben, sondern vielmehr seinem Kristall- bzw. Konstitutionswassergehalt, dergestalt, daß durch Austreiben des gebundenen Wassers durch Kalzinieren und nachherige Wiederauf-In the present method for briquetting fine ores, gout dust and the like. the binding power of the tricalcium phosphate contained in the phosphate chalk is not to attribute it to its phosphoric acid content, but rather to its crystal or Constitutional water content such that by driving out the bound water by calcining and subsequent reassembly

Claims

would take the water when moistening the calcined phosphate chalk for the purpose of briquetting a hydraulic hardening of the briquettes produced takes place, similar to the use of plaster of paris.

Of particular importance here is: the one created by the extinguishing of the calcined Phosphate chalk produced in a considerable excess of the lime present

ίο temperature increase, without which a complete Hydration of the tricalcium phosphate is not possible. Thomas slag contains phosphoric acid as tetracalcium phosphate, which does not form a hydrate and therefore cannot have any hydraulic properties. Because of that in the calcined 'Phosphate chalk present large excess of lime is also due to an effect of phosphoric acid incapable of thinking in a reactive state. So the determination of the citric acid-soluble phosphoric acid in calcined phosphate chalk, predictably was a negative result. Phosphate chalk has been around because of its low price Years ago added to the Thomaseisenmöller. Because of their high phosphorus content they stayed However, significant fluctuations in the phosphorus content of the iron produced does not preclude it but it can be done by using about 8 to 10 percent calcined phosphate chalk Keep the phosphorus content in briquettes within limits that make smelting easy.

If now it is said a little further in Franke's handbook on briquetting favorable behavior of the briquettes containing water of hydration in the blast furnace all briquettes bound by means of lime phosphates must be unique, this must be countered, that the expulsion of the hydration water of the lime phosphate only takes place at a temperature at which a reduction of the briquettes already occurs and thus runs without damage. Practice has shown the durability of the phosphate chalk briquettes.

Example:

Calcined, d. H. dehydrated phosphate chalk is extinguished with water to dust or the Finely ground materials to be briquetted are added directly and mixed intimately with the addition the for. Briquetting the necessary amount of water. It has proven to be useful here proven to allow the mixture to sit for some time before pressing in order to achieve a complete result. Allow hydration of the phosphate; the briquettes would otherwise be too hot get in the press. The briquettes produced in this way harden faster than like ordinary lime briquettes and after a short time they can be stacked in the open air will. After 48 hours, the briquettes are already set so far that they are under Placed in water, retain their firmness.

PATENT-AnSI ³ RUCH:

Method of making briquettes from queasy ores, gout dust and whatever fine minerals and waste products, using phosphates as binders, characterized that the substances to be briquetted with calcined, d. H. dehydrated phosphate chalk and with or without the addition of quick lime in moderately moist conditions be briquetted.