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Recycling |
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Your contacts in Lünen:
Christian Coesfeld
Metal Recycling
 +492306 / 108221
 +492306 / 108449
c.coesfeld@na-ag.com
Your contacts in Hamburg:
Thorsten Steenbock
Metal Recycling
+4940 / 78832211
+4940 / 78832255
t.steenbock@na-ag.com
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| Recycling technology |
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Recycling in the NA Group can follow a variety of processing routes depending on the consistency and chemical composition of the raw materials. This enables us to process a particularly wide range of materials.
In Lünen the treatment process begins – insofar as necessary –with sampling, followed by a preparation stage. Depending on consistency and composition, the raw materials can be cut into chargeable dimensions or treated in a special material preparation plant. This ensures that coarse material can be treated in the facilities. Iron, aluminium and plastics are separated and collected into saleable lots.
Pyrometallurgical processing, i.e. melting, starts in the Kayser Recycling System (KRS). The central facility is a cell smelter which is almost 13 m high. A special feature is the use of a submerged combustion lance, which is immersed into the furnace from above and provides heat and the addition of oxygen and air. The reduction process is very fast in the KRS. Charging times are short. The extracted iron silicate granulate has only very low residual metal contents. Tin and lead are enriched in a slag, which is then processed into a lead/tin alloy in the directly connected lead/tin furnace. During the process, zinc is enriched in a KRS oxide.
The KRS is particularly suitable not only for the treatment of precious metal-bearing raw materials and recycling materials with low copper and precious metal contents, but for all kinds of complex materials. A crude copper is produced with an average copper content of 95 % which is processed further in the anode furnace. There it is refined with additional quantities of copper scrap. The melt is initially oxidised with air and then deoxidised after the slag has been removed. At the end of the pyrometallurgical process, the meanwhile 99 % pure anode copper is cast into copper anodes. These are the starting product for the final refining stage of copper production, the copper tankhouse, where high grade
copper cathodes are produced. Important by-products, in particular, gold, silver and selenium, are enriched in the anode slimes.
Secondary copper production in Hamburg
The basic material for Hamburg’s secondary copper production consists of a variety of recycling materials rich in precious metals as well as intermediary smelter products, originating both from NA’s production plants and from external metal smelters and precious metal separating plants. In accordance with the requirements of the specific raw materials, processing is performed in a modern electric furnace in various melting campaigns. The most important target is the pyrometallurgical separation of lead and copper and the enrichment of precious metals.
By-elements still existing during the copper production, such as lead, bismuth, antimony and tellurium, are separated in the connected lead refinery and sold as lead bullion, lead/bismuth alloy, antimony concentrates and tellurium concentrates. The precious metals are fortified in a so-called rich lead, which has a 70 % precious metal content.
The anode slimes from the NA copper tankhouses are processed together with the rich lead from the lead refinery in the precious metal production plant. With NA’s modern, environmentally-friendly precious metal production facilities, we also cover a wide range of feed materials rich in precious metals. Thus, NA also processes anode slimes from other copper smelters, bullion, precious metal and coin scrap as well as precious metal-bearing sweeps and slag. The sales products include, apart from fine silver, fine gold and concentrates of the platinum group metals, wet selenium, which is processed at Retorte.
The secondary copper production in Hamburg thus focuses on the enrichment and production of precious metals and the separation of various by-metals from copper production.
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