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
Diesel-electric propulsion systems for biggest shipyard in Taiwan reduce fuel costs
18.08.2015 | Siemens AG
New: WayCon Laser sensor LLD-500
17.08.2015 | WayCon Positionsmesstechnik GmbH
Longer, more severe, and hotter droughts and a myriad of other threats, including diseases and more extensive and severe wildfires, are threatening to transform some of the world's temperate forests, a new study published in Science has found. Without informed management, some forests could convert to shrublands or grasslands within the coming decades.
"While we have been trying to manage for resilience of 20th century conditions, we realize now that we must prepare for transformations and attempt to ease...
A University of Oklahoma astrophysicist and his Chinese collaborator have found two supermassive black holes in Markarian 231, the nearest quasar to Earth, using observations from NASA's Hubble Space Telescope.
The discovery of two supermassive black holes--one larger one and a second, smaller one--are evidence of a binary black hole and suggests that supermassive...
A team of European researchers have developed a model to simulate the impact of tsunamis generated by earthquakes and applied it to the Eastern Mediterranean. The results show how tsunami waves could hit and inundate coastal areas in southern Italy and Greece. The study is published today (27 August) in Ocean Science, an open access journal of the European Geosciences Union (EGU).
Though not as frequent as in the Pacific and Indian oceans, tsunamis also occur in the Mediterranean, mainly due to earthquakes generated when the African...
In mountainous regions earthquakes often cause strong landslides, which can be exacerbated by heavy rain. However, after an initial increase, the frequency of these mass wasting events, often enormous and dangerous, declines, in fact independently of meteorological events and aftershocks.
These new findings are presented by a German-Franco-Japanese team of geoscientists in the current issue of the journal Geology, under the lead of the GFZ...
Bacteria do not cease to amaze us with their survival strategies. A research team from the University of Basel's Biozentrum has now discovered how bacteria enter a sleep mode using a so-called FIC toxin. In the current issue of “Cell Reports”, the scientists describe the mechanism of action and also explain why their discovery provides new insights into the evolution of pathogens.
For many poisons there are antidotes which neutralize their toxic effect. Toxin-antitoxin systems in bacteria work in a similar manner: As long as a cell...
20.08.2015 | Event News
20.08.2015 | Event News
19.08.2015 | Event News
31.08.2015 | Earth Sciences
31.08.2015 | Health and Medicine
31.08.2015 | Seminars Workshops