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Siemens to Install Hot Metal Desulfurization Technology at ArcelorMittal Monlevade
05/29/2012 - Siemens VAI Metals Technologies has developed a new system for hot metal desulfurization, HM De-S, which combines the pressure-vessel based injection technology for powder agents with the addition of magnesium granules via the patented Simetal Feldhaus process. A hot metal desulfurization system based on the HM-De-S design is currently being constructed for ArcelorMittal Monlevade S.A. in the state of Minas Gerais, Brazil.
Siemens VAI Metals Technologies has developed a new system for hot metal desulfurization, HM De-S, which combines the pressure-vessel based injection technology for powder agents—such as burnt lime and calcium carbide—with the addition of magnesium granules via the patented Simetal Feldhaus process.
A hot metal desulfurization system based on the HM-De-S design is currently being constructed for ArcelorMittal Monlevade S.A., a Brazilian steelmaker in João Monlevade, in the state of Minas Gerais, Brazil. The system is part of an expansion of the steelworks, for which Siemens is also supplying ladles, deslagging stations, ladle and slag pot transfer cars, and the associated electrical and automation equipment. Siemens is also enlarging the material feed system and installing two secondary dust cleaning systems.
With its new HM De-S system, Siemens offers steelworks operators a solution for desulfurization that combines gravimetric dosing of the powdered burnt lime (CaO) and calcium carbide (CaC2) with volumetric dosing of the Mg granulate by the Simetal Feldhaus. The Simetal Feldhaus dosing system has been specially developed for pneumatically conveying dense flows of granular materials, which have different requirements to those of powder materials.
The pre-dosed desulfurizing agents are then fed through a common injection pipe and the immersion lance into the hot metal. The system can be operated according to requirements in mono-, co-, or multi-injection mode. As the pre-dosing is material-specific, the individual flow rates of the CaO, CaC2, and Mg can be optimally and reproducibly adjusted to meet the requirements for the grades of steel being produced, which saves desulfurizing agents—especially in co- and multi-injection mode—and reduces the amount of slag formed.
For an average desulfurization station with an annual capacity of around 1.75 million tonnes of hot metal and ladle tapping weights between 165 and 180 tonnes, the injection rate of CaO or CaC2 can be varied between 20 and 60 kilograms per minute, and that for Mg between 6 and 14 kilograms per minute. This enables the sulfur content to be reduced from typically 200 to 400 ppm to 20 ppm and subjacent, according to Siemens. A typical process time for reducing the sulfur by around 250 ppm is 13 minutes. This requires less than 0.6 kilograms of Mg and about 2.8 kilograms of CaO per tonne of hot metal. The process creates about 9 kilograms of slag per tonne hot metal.
The desulfurization system is offered as a complete solution, including the unloading station for the desulfurizing agents, silo and storage facilities, the gas supply and distribution, the dosing systems, the desulfurization station, and lances, lance magazines and ladle cars. The enclosure can have either a fixed or movable cover. As well as the mechanical and processing equipment, HM De-S also includes the electrical equipment, instrumentation, the complete basic and process automation, process models, analysis and optimization software, and the operator control and visualization system.
The Siemens Industry Sector (Erlangen, Germany) is a leading supplier with end-to-end automation technology and industrial software, solid vertical-market expertise, and technology-based services. With a global workforce of more than 100,000 employees, the Industry Sector comprises the Divisions Industry Automation, Drive Technologies and Customer Services as well as the Business Unit Metals Technologies.
The Metals Technologies Business Unit (Linz, Austria), part of the Siemens Industry Sector, is one of the world’s leading life-cycle partners for the metallurgical industry. The business unit offers a comprehensive technology, modernization, product and service portfolio as well as integrated automation and environmental solutions covering the entire life cycle of plants.
