DE212215C

DE212215C -

Info

Publication number: DE212215C
Application number: DENDAT212215D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Die Erfindung betrifft ein Verfahren zurThe invention relates to a method for

Gewinnung flüchtiger Chloride, insbesondere der Schwermetalle, aus den entsprechenden sulfidischen und oxydischen Verbindungen.Extraction of volatile chlorides, especially heavy metals, from the corresponding sulphidic and oxidic compounds.

Die Erfindung beruht auf der Erkenntnis, daß, wenn man die oxydischen oder sulfidi-The invention is based on the knowledge that if you use the oxidic or sulfidi-

. sehen Verbindungen von Metallen, welche leicht flüchtige Chloride bilden können, mit anderen Chloriden, insbesonders den Chloriden der Alkalien oder Erdalkalien und mit Brennstoff mischt, sodann dieses Gemisch entzündet und einen Preßwindstrom hindurchschickt, das Gemisch in Glut versetzt wird und darin eine chemische Umsetzung unter Bildung der leichter flüchtigen Chloride stattfindet, welch letztere mit den Verbrennungsgasen entweichen. Demgemäß besteht das vorliegende Verfahren darin,, daß ein Gemisch von oxydischen oder sulfidischen Verbindungen der Schwermetalle mit Brennstoff (Kohle) und Chloriden, z. B. Kochsalz oder Kalziumchlorid, in einem geeigneten Behälter nach Einleitung der Verbrennung mittels eines Preßwindstromes verblasen wird und die sich verflüchtigenden und aus dem Behälter entweichenden Chloride der Schwermetalle in Kondensationseinrichtungen aufgefangen werden.. see compounds of metals, which can form volatile chlorides, with others Chlorides, especially the chlorides of alkalis or alkaline earths and with fuel mixes, then ignites this mixture and sends a compressed wind flow through it, the Mixture is put in embers and in it a chemical reaction with the formation of the lighter volatile chlorides takes place, which the latter escape with the combustion gases. Accordingly, there is the present Process in that a mixture of oxidic or sulphidic compounds of the Heavy metals with fuel (coal) and chlorides, e.g. B. table salt or calcium chloride, in a suitable container after initiation of the combustion by means of a compressed wind flow is blown and the volatilizing and escaping from the container chlorides of heavy metals in condensation devices be caught.

Das Verfahren kann in seiner Arbeitsweise verglichen werden mit dem bekannten Huntington-Heberlein-Verblaseprozeß der Bleierzröstung, welcher bekanntlich in dem Hindurchblasen eines gepreßten Luftstromes durch eine verhältnismäßig niedrige Schicht von feinem Erz besteht, wobei durch den Luftstrom der Schwefel oxydiert wird und in Form von schwefliger Säure entweicht, während das Erz zu einem schlackenartigen, zusammenhängenden Block zusammensintert. Genau in derselben Weise und unter Anwendung gleicher Apparate (sog. Huntington-Heberlein-Konverter) wird das vorliegende Verfahren ausgeführt. Während aber bei dem Huntington-Heberlein-Verfahren als Brennstoff der Schwefel des Erzes dient, wird bei vorliegendem Verfahren dem Verblasematerial der erforderliche Brennstoff in Form von feiner Kohle beigemischt. "**The method of operation can be compared to the well-known Huntington-Heberlein blowing process the roasting of lead, which is known to occur in the blowing through a compressed air stream through a relatively low layer consists of fine ore, whereby the sulfur is oxidized by the air stream and in Form of sulphurous acid escapes, while the ore becomes a slag-like, cohesive one Block sintered together. Exactly in the same way and using the same apparatus (so-called Huntington-Heberlein converter) the present procedure is carried out. But while in the Huntington-Heberlein trial as In the present process, the fuel used for the sulfur of the ore becomes the blown material the required fuel in the form of fine coal is added. "**

Der weitere Unterschied mit dem Huntington-Heberlein-Verfahren liegt natürlich darin, daß es sich in beiden Fällen um zwei völlig verschiedene chemisch metallurgische Vorgänge handelt.The other difference with the Huntington-Heberlein procedure is of course in the fact that in both cases there are two completely different chemically metallurgical ones Operations.

Das beanspruchte Verfahren läßt sich auf die Abscheidung von Metallen, welche flüchtige Chloride bilden, aus Gemischen dieser Metalle mit solchen Stoffen anwenden, welche keine Chloride oder keine flüchtigen Chloride bilden können und auf die Trennung von Metallen, deren Chloride sich in verschiedenem Maße verflüchtigen.The claimed process can be applied to the deposition of metals, which are volatile Form chlorides, apply from mixtures of these metals with substances that do not Can form chlorides or no volatile chlorides and on the separation of metals, the chlorides of which volatilize to varying degrees.

Als Beispiel für die Ausführung und Anwendbarkeit des Verfahrens sei im folgenden die Herstellung von Zinkchlorid aus oxydischen oder sulfidischen Zinkerzen beschrieben :.The following is an example of the implementation and applicability of the method the production of zinc chloride from oxidic or sulfidic zinc ores is described :.

Das fein gepulverte Zinkerz wird mit einer seinem Zinkgehalt entsprechenden Menge von Kohle und von Kochsalz innig vermengt und das Gemenge in einen Konverter eingetragen, wie solche bei dem Huntington-Heberlein-Verfahrender Bleierzröstung verwendet werden. Auf dem Rost des Konverters warThe finely powdered zinc ore is mixed with an amount of Coal and table salt are intimately mixed and the mixture is fed into a converter, such as those used in the Huntington-Heberlein process of lead roasting will. Was on the grate of the converter

Claims

a small fire had been lit beforehand. After the zinc coal and salt mixture has been introduced, a wind current, initially weakly and later more strongly pressed, is blown from below through the ignited mixture. This gradually burns the coal contained in the mixture, and the contents of the converter are turned into lively embers. At the same time, the table salt reacts with the zinc compounds of the ore, forming zinc chloride and sodium sulfate. If the zinc is present in the zinc ore in the form of an oxide compound, a slightly sintering sodium silicate slag is formed with the help of the siliceous, earthy or metallic compounds present in the ore or possibly added to it as flux. The zinc chloride formed is volatilized as a result of the high temperature prevailing in the mixture. and escapes from the converter with the gas flow. The converter is provided with a tightly closing hood, to which a pipeline connects, which leads to the condensation chambers. In these the volatilized zinc chloride is precipitated and collected. The separation of gold and silver from ores containing gold and silver can be cited as an example of the application of the process for the extraction of metals from mixtures of metals with substances which cannot form volatile chlorides. As in the example described above, the ores containing gold and silver are mixed with coal and table salt and blown after the combustion has started. During this process volatile gold and silver chloride is formed, which escape from the blowing container and are collected by suitable devices. Metallic iron can advantageously be introduced into the condensation chambers, on which gold and silver are immediately in a metallic state in a manner known per se; knock down. It has previously been proposed to use ores such as B. zinc ores, to mix with chlorides and to bring the mixture to such a high temperature that from her metal chlorides, such as. z. B. zinc chlorides, can be removed by volatilization. According to these known proposals, however, the mixture is heated from the outside or by means of a flow of heating gas flowing through the mixture. In contrast to this, in the method according to the invention, fuel is added in solid form to the mixture of ore and chlorides, and the temperature required to carry out the chlorination and to volatilize the chlorides formed is only achieved by burning out the coal added to the mixture by passing a compressed air stream through the mixture. As a result of the direct contact of the fuel with the reaction mixture, the heat output in the present process is significantly more favorable and the fuel consumption is consequently considerably lower than when heating by combustion gases generated outside the reaction mixture. Another beneficial effect of the direct contact of the reaction mixture with the fuel is that the glowing coal causes an intermediate reduction of the metallic compounds to form vaporous metal, which is more easily accessible for chlorination. According to this, the process offers a significant technical advance over the known proposals insofar as it allows the chlorination and volatilization to be carried out more quickly, more completely and with less fuel consumption. Ρλτε ν t-An Proverbs:

1. Process for the extraction of volatile chlorides, especially heavy metals, from sulfidic or oxidic compounds by heating a mixture of the ores and products containing these compounds with other chlorides in an oxidizing atmosphere up to the volatilization temperature, characterized in that the ore ο. Like. And chlorides existing reaction mass mixed with solid fuel (coal) and blown through a stream of air to the required temperature is brought.

2. embodiment of the method according to claim 1, characterized by its use for the separation of metals from mixtures of the same with substances which have no or at least none Can form volatile chlorides, as well as to separate metals, the chlorides of various volatility.