Displaying items by tag: Austria

Austria/Germany: Austria-based Porr says it has used a new annular gap mortar bound with granulated slag, instead of cement, on the Filder Tunnel stage of a project for Deutsche Bahn near Stuttgart. The engineering company reports that the pilot project was a success and the ‘practically cement-free construction material’ has already been patented. Porr is now looking for further cooperation partners.

“The nature of the soil means that a cement-based construction material would not have been suitable,” said Porr’s chief executive officer Karl-Heinz Strauss. “This gave us the opportunity to use this brand new construction material”. He added, “Apart from allowing us to contribute to reducing CO², this construction material has two fundamental advantages. It is less sensitive to environmental factors than concrete containing cement. And it can be transported for long periods without any problems before it is processed as it needs an activator to fully harden”.

Image copyright: Arnim Kilgus

Austria: Rail logistics company ÖBB Rail Cargo Group (RCG) says that its haulage of 80,000t/yr of granulated blast furnace slag (GBFS) and clinker to and from w&p Zement's Wietersdorf cement plant in Carinthia by rail has removed 3200 trucks/yr from the road since its start in 2019. RCG's trains deliver the plant's clinker to the Peggau-Deutschfeistritz railway station in Styria, and return to the plant laden with GBFS from steel producer Voestalpine's nearby Leoben refinery.

RCG said that w&p Zement is currently working to increase its operations' reliance on rail, adding "Further innovative transport solutions are already being worked on."

Austria: Neuson Hydrotec is promoting its MRP40300 type mobile screener and crusher. The tracked product was developed to screen waste slag-containing material on site using magnetic separators and then crush it for reuse. The unit consists of: a vibrating feed and dosing unit, for converting discontinuous feed into continuous feeding of the bulk material into the plant; a vibration sieve for separation into up to four fractions; up to three magnetic separators for separating bulk materials; and discharge belts for the continuous discharge of the individual fractions.

“With the MRP, we were able to create the missing link between breaking steel slag and the finished, sorted end product. It was important to us not only to crush the steel-containing slag with our patented jaw crusher, but also to be able to subsequently separate the iron-containing material and slag into different fractions. Our customers can now look after several company locations with our mobile machines. The construction of stationary systems at each location is no longer absolutely necessary,” said Markus Zweimüller, head of the business machines division at Neuson Hydrotec.

Linz-based Neuson Hydrotec is a manufacturer of hydraulic and drive technology products for mobile and stationary applications.

Germany: Loesche says it is continuing its research and development of a process to create a steel slag suitable for cement production following a legal dispute.

The engineering company has worked with the FA Finger-Institut für Baustoffkunde (FIB) at Bauhaus-Universität Weimar on the thermally reductive modification of steel slags for recycling iron and manufacturing ‘steelworks clinker.’ It has developed two procedures for thermally reductive conditioning of BOF (Basic Oxygen Furnace) slag that have been registered for a patent, which largely differ in the respective cooling process for the remaining molten metal. The individual stages of the procedure have already been tried and tested on an industrial scale. Loesche’s partner for the entire procedure is Primetals Technologies based in Linz, Austria, which has industrial-scale plants for reduction and fast cooling based on patented procedures in its product range. The remaining iron (approximately 8 - 10%) that is still in the ‘steelwork clinker’ can then be separated in a Loesche mill. The separation procedure for this, which has also been patented by Loesche, has been in operation for approximately six years to recycle stainless steel from stainless steel slags in a recycling plant in Belgium.

However, following smelting trials conducted with the Bundesanstalt für Materialforschung und -prüfung (BAM) in 2011, Loesche faced a lawsuit regarding the patents for its procedures. The legal uncertainty that this created led to the suspension of further development and implementation of the two procedures for more than three years. The legal dispute was resolved in December 2017. The second conditioning procedure – the fast cooling – was assigned as the sole property of Loesche. A third of the ownership of the first conditioning procedure - slow cooling – was conceded to the BAM, represented by the German government.

Loesche now plans to implement the second procedure into industrial practice.

Austria: Voestalpine has held the official ground breaking ceremony for its new steel plant in Kapfenberg. Once operational in 2021 the new Euro350m plant will produce around 205,000t/yr of steel for the aviation, automotive and oil and gas sectors. The site is intended to replace the existing Voestalpine Böhler Edelstahl plant in Kapfenberg. The plant will use an electric arc furnace to melt down scrap combined with various alloy metals into special steels. It will operate using electricity generated from renewables.