DE278061C

DE278061C -

Info

Publication number: DE278061C
Application number: DENDAT278061D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Die technische Unmöglichkeit, gewisse arme oder komplexe Zinkerze nach ihrer üblichen Überführung durch Kalzinieren oder Rösten in oxydische Materialien im Zinkhüttenbetrieb rentabel zu verarbeiten, hat dazu geführt, aus diesen Erzen das Zinkoxyd zu isolieren, was meist durch Verblasen geschieht. Auf diese Weise erhält man ein Material, das seines hohen Zinkgehaltes wegen den armenThe technical impossibility of producing certain poor or complex zinc ores according to their usual Conversion by calcining or roasting into oxidic materials in the zinc smelter profitable processing has led to isolating the zinc oxide from these ores, which mostly happens by blowing. In this way you get a material that its high zinc content because of the poor

ίο Erzen gegenüber bei der Verhüttung überlegen ist bezüglich Schmelzkosten und Ausbringen, und den komplexen Erzen gegenüber den Vorzug hat, daß es nicht mehr die das Gefäßmaterial korrodierenden Eigenschaften des Roherzes besitzt. Diesem verblasenen Zinkoxyd (auch solchem anderer Herkunft) haftet jedoch wegen seiner äußerst feinen Verteilung als hauptsächlichster Übelstand die Eigenschaft an, daß es beim Destillationsprozeß durch die entstehenden Gase leicht aufgewirbelt und mitgerissen wird, was zu Verlusten und Poussierebildung führt.ίο Superior to ores in smelting is preferred over smelting costs and yields, and complex ores has that it no longer has the properties of the raw ore that corrode the vessel material. That faded zinc oxide (also those of other origins) sticks because of its extremely fine distribution the main disadvantage is that it occurs during the distillation process is easily whirled up and carried away by the resulting gases, resulting in losses and Poussiere formation leads.

Gegenstand vorliegender Erfindung ist ein Verfahren zur Vorbehandlung des Zinkoxydes, welches darin besteht, daß man das mit Wasser zu einer teigartigen Masse angerührte Oxyd in einem geeigneten Apparat unter Bewegung trocknet und durch mechanische Einwirkung gleichzeitig dafür Sorge trägt, daß das Oxyd geknetet wird und dadurch z. B. die Form von etwa erbsen- bis hirsekorngroßen Kugeln annimmt, die eine erhebliche Dichte und Festigkeit aufweisen.The present invention relates to a process for the pretreatment of zinc oxide, which consists in mixing it with water to form a dough-like mass Oxide dries in a suitable apparatus with agitation and by mechanical action at the same time ensures that the oxide is kneaded and thereby z. B. the Assumes the shape of pea to millet-sized balls with a considerable density and have strength.

Man hat auch vorgeschlagen, Zinkoxyd durch Anrühren mit einer starken Lösung von Zinkchlorid zu vermischen, so daß ein Oxychlorid entsteht. Die Masse erhärtet und wird dann durch Erhitzen auf höhere Temperatur von dem Zinkchlorid befreit. Dieses Verfahren liefert also entweder eine zusammenhängende Masse oder ein dichtes Pulver. Außerdem sind zu seiner Ausführung komplizierte Verdichtungsapparate notwendig, da Zinkchlorid bekanntermaßen sich nur schwer ohne Verluste kondensieren läßt. Überhaupt ist die Notwendigkeit, Zinkchlorid als Zusatz zu verwenden, aus ökonomischen und technischen Gründen unvorteilhaft.It has also been suggested to mix zinc oxide with a strong solution of Mix zinc chloride to form an oxychloride. The mass hardens and becomes then freed from the zinc chloride by heating to a higher temperature. This method thus either provides a coherent mass or a dense powder. aside from that Complicated compression equipment is necessary for its execution, as zinc chloride is known to be difficult to condense without losses. In general, the need is To use zinc chloride as an additive, for economic and technical reasons unfavorable.

Die meisten Vorschläge, das lockere, verblasene Zinkoxyd auf eine für die Verhüttung geeignete Form zu bringen, laufen darauf hinaus, daß das Oxyd auf eine höhere Temperatur erhitzt wird. Hierdurch wird die dem zarten Pulver anhaftende Luft ausgetrieben; das Oxyd nimmt ein derberes Korn an und sinkt zusammen. Jedoch bleibt das Material immer noch pulverförmig und wird, wenn auch in geringerem Maße, noch von den Reaktionsgasen mitgerissen, namentlich dann, wenn die Entzinkung in größeren Gefäßen vorgenommen wird als gewöhnlich, wie dies z. B. in schachtartigen Öfen oder elektrischen Öfen der Fall ist, in welchen die abziehenden Gase an Menge sowohl wie auch an Geschwindigkeit den Gasen in der gebräuchlichen Muffel überlegen sind.Most suggestions put the loose, faded zinc oxide on one for smelting Bringing suitable shape boils down to bringing the oxide to a higher temperature is heated. This expels the air attached to the delicate powder; the oxide takes on a coarser grain and sinks. However, the material remains still powdery and is still, if to a lesser extent, from the reaction gases carried away, especially when the dezincification is carried out in larger vessels than usual, like this z. B. is the case in shaft-like ovens or electric ovens, in which the withdrawing Gases in quantity as well as in speed of the gases in the usual muffle are superior.

Das nach dem vorliegenden Verfahren vorbereitete Zinkoxyd bildet kleine schwere Stücke,The zinc oxide prepared according to the present process forms small, heavy pieces,

Claims

which due to their own weight are not carried away by the gases, but also also because of their spherical shape - alone as well as in a manner known per se Mixed coke breeze - leave enough space between the individual particles to allow the Allowing gases to pass unhindered like / them from the reduction process itself originate or a mixture of these with the

ίο Heating gases from a shaft furnace or similar Represent devices, or consist of other gases that are used for the purpose of metal extraction be passed over the oxide. The general strength of the balls allows them to do so

i'5 free passage of gas even in higher apparatus up to the lowest zones of the reaction / space, in which otherwise the lower batch parts as a result of the pressure of the heavy load above are so close that a.

easier, even and all-round gas passage is excluded.

Furthermore, the fact that the faded zinc oxide is a lot when mixed with water goes together more strongly than by mere, continuous heating or by pressing, and that this pulp does not puff up or loosens when it is dried with kneading, but rather maintains its reduced volume, it implies that the batch is also extremely gets small volume. A vessel intended for reduction therefore has if it has the zinc oxide prepared according to the above procedure is charged, a much larger capacity with regard to zinc, since more metal can be distilled out per unit of space, than with ordinary zinc oxide or even with ores.

Eventually, the faded zinc oxide becomes hydrated and hydrated when moistened with water later sets when drying; thereby come ^ within each of the mechanically educated Balls the individual particles in much closer contact and later form a solid, self-contained, uniform mass, which also becomes quite dense by kneading. The oxide treated in this way offers resistance to heat transmission is much lower than that of the original fine powder, whose thermal conductivity decreases with increasing fineness. So it will be if how in the muffle process, the amount of heat required to reduce the zinc is supplied to the batch from outside, this in a shorter time can be accomplished - supported by the above-mentioned slight deduction of the gaseous reaction products through the charge - and thus an economy of the Fuel, wages, etc.

Instead of water, other liquids that have a hydrating or sticky effect can also be used. can be used, as well as tar.

The compacted spherical oxide also provides for operation in the electric furnace excellent in its reduction temperature, fine powder and others electrical conductivity is a superior material.

Ρλτε ν τ-An saying:

Process for the pretreatment of finely divided zinc oxide by heating the Oxide mixed with water or another liquid, characterized by moderate heating of the moist oxide with a kneading movement, so that it becomes small spherical when it dries Particles from millet grain to pea size are compacted.