Technology Center

Leoben, Austria

Technology Center

Leoben, Austria
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Odreitz W.,Technology Center | Wheeler M.,RHI Monofrax
Ceramic Engineering and Science Proceedings | Year: 2011

As the world's largest producer of refractory materials, RHI recognizes the need to be environmentally conscious as well as to support the efforts of our customers to reduce their carbon footprint. In 2009, RHI recycled more than 70,000 metric tons of used refractory materials received from all markets worldwide. These materials (not all originally manufactured by RHI) are used in a large variety of products and applications with the end goals to save natural resources, reduce carbon emissions created by processing raw materials, reduce landfill, save landfill costs and provide cost savings to our customers. This paper presents RHI recycling philosophy, where we started and what the future holds.

Tang Y.,Technology Center | Hackl G.,Technology Center | Nitzl G.,RHI AG Steel Division | Kammerhofer H.,RHI AG Steel Division | Eglsaeer C.,RHI AG Steel Division
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

In the steel continuous casting process, ISO products play an important role to control the liquid steel from ladle to mould shrouding the liquid steel to avoid re-oxidation. A new and special designed nozzle called GYRO nozzle for billet/bloom casting is introduced in this paper, which can generate swirling flow in the mould and helps non-metallic inclusions floating up. The novel stopper designs of CSC and SHP are also introduced in the paper. These designs are state of the art technologies to ensure consistent argon flow and homogeneous gas distribution in the casting channel for stopper argon purging process. Finally, customized designed SEN for thin slab casting is described to maintain a stable mould level at high casting speed.

Morales R.D.,National Polytechnic Institute of Mexico | Tang Y.,Technology Center | Nitzl G.,RHI AG | Eglsaeer C.,Technology Center | Hackl G.,Technology Center
ISIJ International | Year: 2012

A submerged entry nozzle (SEN) for thin slab casters operating at casting speeds as high as 7.5 m/minute was developed based on fundamental grounds of boundary-layer theory and water modeling experiments. Experimental techniques included tracer injection to observe overall fluid flow patterns, high speed video camera and image analysis to follow dynamic changes of meniscus levels and particle image velocimetry to measure water speeds in the mold. This design was compared with two other SEN designs of nozzles under current commercial use at various thin slab casters. Direct comparisons of mathematical simulations and experimental results among the three SEN's evidenced that this new SEN yields very stable flows which are independent from casting speed and nozzle immersion depth. Fluid flow developed by this SEN consists of a double roll pattern without generation of superficial vortices. The two other SEN's yield instable discharging jets due to and excessive shearing effects with the surrounding fluid inducing severe dissipation of kinetic energy which promotes severe tailing effects inducing strong meniscus oscillations. The proposed design has reported good industrial performances and a longer operating life because the slag protection belt suffers less wear thanks to smaller velocities of the bath in contact with the SEN wall. © 2012 ISIJ.

Pellegrino M.S.,RHI U.S. Ltd. | Trummer B.,RHI AG 1100 Vienna | Viertauer A.,RHI AG 1100 Vienna | Hackl G.,Technology Center
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2016

Soft purging has turned into an essential process step in ladle secondary metallurgy in order to achieve the required high levels of inclusion separation. Appropriate purging ceramics and state-of-the-art gas control equipment have a significant influence on the efficiency of this process. In this paper results of water modeling experiments with several different purging plug designs will be presented. A comparison of bubble generation, bubble numbers and bubble dimensions will be given. Flow characteristics and the influence of the gas control equipment will be described. The water model findings will be evaluated and possible effects on soft purging efficiency will be discussed.

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