DE689123C - s iron coated with copper, nickel or alloys of these metals - Google Patents

Description

Process for the recovery of the single metals from with copper, nickel or alloys of these metals coated iron To make iron for many purposes To make usable, the same is increasingly done with more noble metals, such as z. B. copper, nickel, etc., or alloys of these metals coated or plated, which results in cheaper workpieces that now have the advantageous properties of the surface metal.

Up until now it has been very difficult to scrap from such objects made of iron coated with a protective metal to separate the iron from the metal of the coating layer in such a way that both metals of the Economy can be fed back.

It has already been suggested by plating or by electroplating Separate metal coatings produced by precipitation on iron sheets from the base metal, that for the purpose of oxidizing the metal coating on the continuously heated metal waste atmospheric air or another oxidizing agent such as e.g. B. water vapor, is directed, whereupon by simply cooling the waste or by quenching the metal coating is removed in water or by mechanical treatment.

This known method has the disadvantage that when relatively must be worked at high temperature, for example in the case of a copper coating the copper oxide formed as a result of this high temperature partly with the base metal Iron melts and is lost as a result. There are also no larger ones Amounts of iron burnup.

According to the invention, these disadvantages are avoided; that this with the protective metal, like copper, nickel, or with alloys of these Metals coated iron. in the warmth, preferably in red heat, sulphurous Exposed to vapors, whereupon it is suddenly quenched and the s & formed and separated sulfides of the coating metals in a known manner on the Metals are processed themselves. Of course, the sulfides can also be used as such find further use.

The iron itself, as it is protected by the coating layer, not noticeably attacked at the selected temperature, but remains as valuable Scrap iron back. Embodiment 100 kg of iron waste, the approx. 100 kg of copper layer are hung in racks and then in an electrically or otherwise heated and stone-lined annealing furnace pushed into the lower part small cultivation is located in which the sulfur is at low temperature at about 300 ° C is evaporated. The sulfur vapors are distributed in the furnace by a paddle mixer, it is expedient that there is a slight overpressure in the furnace. Things are exposed to the sulfur-containing vapors for about 112 hours and then immersed in a container of water, which will cause the copper sulfide to fall off. After cooling down and, if necessary, a short balling in a drum, the iron will be almost 100 ° / o recovered.

Theoretically, 100 kg iron waste with 10% copper coating is required about 25 kg of sulfur. In practice, however, the sulfur consumption is a bit of a concern higher, so that about 34 kg of sulfur are consumed. At Nikkel is consumption naturally higher and is theoretically 60 kg and practically about 8o kg.

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Claims (1)

PATENT CLAIM: Process for the recovery of the individual metals iron coated with copper, nickel or alloys of these metals by treating in the heat and subsequent quenching in water, characterized in that the iron coated with the protective metal in the heat, preferably in red heat, is exposed to sulphurous vapors.