Developed by Siemens, this innovative process makes it possible to more precisely dose the various desulfurizing agents that are injected into the molten metal and do so more economically.
For this purpose, desulfurizing agents such as burnt lime, calcium carbide, and magnesium are injected into the molten metal. Of the three agents, magnesium is the most effective but also the most expensive. A higher concentration of magnesium is used whenever a large reduction in sulfur content is required and processing time is limited. Allowing for variations in the precise process parameters, the production of one metric ton of steel typically requires the addition of around 0.7 kilograms of magnesium and just under three kilograms of burnt lime. A plant with an annual output of one million metric tons of steel will therefore face production costs of over €1.5 million for magnesium alone.
The desulfurizing agents are added individually or in combination by means of a carrier gas injected into the molten metal via a so-called lance. Here the major challenge consists in maintaining a precise, predefined flow of the individual agents despite their different physical characteristics: burnt lime and calcium carbide are fine powders; magnesium is a granulate. To ensure precise dosing of the magnesium granules, Siemens has adopted the Feldhaus process, which has been in use at a Düsseldorf steel plant since 1999. Unlike the conventional pressure vessel-based techniques used to inject powder agents, this pneumatic conveying process ensures precise dosing of the magnesium.
In addition, the desulfurizing plant has been enhanced in such a way that the dosage of the powder agents can be controlled more precisely. This has involved the redesign of the containers in order to ensure that the powders flow evenly into the stream of gas.
The new plant in Brazil will make it possible to use desulfurizing agents more cost-effectively, control the sulfur concentrations in the end product with greater precision, and reduce the magnesium requirement of a steelworks by around 10 percent.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
Measuring filling levels in automated Industry 4.0
03.08.2015 | WayCon Positionsmesstechnik GmbH
Connecting industrial outstations inexpensively and securely
14.07.2015 | Siemens AG
Continuing current carbon dioxide (CO2) emission trends throughout this century and beyond would leave a legacy of heat and acidity in the deep ocean. These...
Glacier decline in the first decade of the 21st century has reached a historical record, since the onset of direct observations. Glacier melt is a global phenomenon and will continue even without further climate change. This is shown in the latest study by the World Glacier Monitoring Service under the lead of the University of Zurich, Switzerland.
The World Glacier Monitoring Service, domiciled at the University of Zurich, has compiled worldwide data on glacier changes for more than 120 years. Together...
Using ultracold atoms trapped in light crystals, scientists from the MPQ, LMU, and the Weizmann Institute observe a novel state of matter that never thermalizes.
What happens if one mixes cold and hot water? After some initial dynamics, one is left with lukewarm water—the system has thermalized to a new thermal...
Physicists from Regensburg and Marburg, Germany have succeeded in taking a slow-motion movie of speeding electrons in a solid driven by a strong light wave. In the process, they have unraveled a novel quantum phenomenon, which will be reported in the forthcoming edition of Nature.
The advent of ever faster electronics featuring clock rates up to the multiple-gigahertz range has revolutionized our day-to-day life. Researchers and...
Researchers have developed an ultrafast light-emitting device that can flip on and off 90 billion times a second and could form the basis of optical computing.
04.08.2015 | Event News
23.07.2015 | Event News
10.07.2015 | Event News
04.08.2015 | Information Technology
04.08.2015 | Power and Electrical Engineering
04.08.2015 | Materials Sciences