Report: ‘Slags: Iron and copper ore: Cadastre Seewasserbau – Lower Saxony coast (2003)»
Description
«For the first time, there is a cartographic recording of slag materials from the smelting industry used in seawater construction on the coast of Lower Saxony, from which it is not clear to this day whether the heavy metals contained in them enter the environment in bioavailable form. Under the sometimes extreme environmental conditions to which the slags in the marine littoral are exposed, there is the possibility of long-term weathering effects, which cannot be simulated in standardised test methods for the stability testing of water building blocks. The data of this cadastre are used to document all installation sites of slag stones, which gained knowledge over a period of 6 years along the coast of Lower Saxony. In the course of 27 operations, 13 sites with 117 individual sections were identified as areas where slag stones were installed. From west to east, this is the island of Borkum, the experimental dump Campen (Ems), the Leybucht with the areas Leyhörn and Leysiel, the Norddeich marina, the islands Norderney, Baltrum, Langeoog, Spiekeroog, Wangerooge, Minsener Oog, a dyke section near Blexen (Weser) and the area around the Kugelbake near Cuxhaven. All sites were characterised by a simple catalogue of features. The main interest was macroscopically recognizable peeling surfaces, cracking and rust formation. In 52 cases where the installed slag species could not be identified securely on site, analyses were carried out to determine the chemical composition. The most common were slags from copper ore smelting, which are referred to as “iron silicate rock” or “NA slag”, and slag from pig iron and steel production as well as slag from copper recovery. The assessed hydraulic structures were all above the low-water line and, apart from slag of various sizes, often contained, in some cases, natural stones such as basalt, granite or greywacke; iron or scrap parts as well as bricks or building debris were sometimes represented. In some cases, slag-adjusted areas were subsequently covered with natural stones. Most of the audited slag sites were located in the areas of buhns and coverworks on the western sides of the islands exposed to the riots, at guidance dams and cover works of port forefields and port facilities, as well as at the foot bumps of dikes and threshold barrier dams. The most common types of slag were loose or set bulks that were uncast or encapsulated with concrete or asphalt. In many cases, these stabilisations did not withstand the onslaught of surf and current, so that apart from cracked roofs and abrasions caused by sand sand, there were also cracked or micro-cracked slags. The causes of temperature fluctuations are assumed, which led to crack formations due to production-related predispositions and inhomogeneities in the crystal lattice. Invading rust caused explosions and surface discoloration of slag stones and contact sediments. The weathering resistance of slag from copper production exceeds that of the rapidly corroding slag from iron and steel production.’
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Tags
- niedersächsische-küste
- schlacke-kataster-eisenerz-kupfererz-seewasserbau-verhüttung-nlwkn