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
High-purity plastic parts: the search for inclusions
25.07.2016 | CTR Carinthian Tech Research AG
Modular Prototype Production with Lasers Enables Faster Gas Turbine Development
06.07.2016 | Fraunhofer-Institut für Lasertechnik ILT
Scientists and engineers striving to create the next machine-age marvel--whether it be a more aerodynamic rocket, a faster race car, or a higher-efficiency jet...
Waveguides are widely used for filtering, confining, guiding, coupling or splitting beams of visible light. However, creating waveguides that could do the same for X-rays has posed tremendous challenges in fabrication, so they are still only in an early stage of development.
In the latest issue of Acta Crystallographica Section A: Foundations and Advances , Sarah Hoffmann-Urlaub and Tim Salditt report the fabrication and testing of...
Electrochemists at TU Graz have managed to use monocrystalline semiconductor silicon as an active storage electrode in lithium batteries. This enables an integrated power supply to be made for microchips with a rechargeable battery.
Small electrical gadgets, such as mobile phones, tablets or notebooks, are indispensable accompaniments of everyday life. Integrated circuits in the interiors...
Recent findings indicating the possible discovery of a previously unknown subatomic particle may be evidence of a fifth fundamental force of nature, according...
A nanocrystalline material that rapidly makes white light out of blue light has been developed by KAUST researchers.
25.08.2016 | Event News
24.08.2016 | Event News
12.08.2016 | Event News
26.08.2016 | Health and Medicine
26.08.2016 | Earth Sciences
26.08.2016 | Life Sciences