Researches Regarding the Influence of Technological Parameters on the Alloying Efficiency in Powder Injection Process

Abstract:

The injection of the powdered materials into molten melts is a common practice in the metallurgical technology of steel refining and alloying. During process development, within the metal bath is formed a mixed three-phase with different structures depending on the parameters of the hydrodynamic injection. The “plume zone” represents a domain inside of the molten metal in which takes place the forming, coalescence and disintegration of the gas bubbles, that penetrate into the molten metal together with the powdered material. The “plume zone” is the primary contact zone between the powdered particles and the molten metal. Inside of contact zone is take place the chemical reactions between the reactive material and the metal bath components. The “plume zone” size, shape and structure are functions of the hydrodynamic parameters of the injection process, the most important being the injection speed. The size of this parameter leads at the appearance of a multitude of possible structures types of the metal bath. These structures dictate the metallurgical process efficiency in defining the steelmaking process and refining of metal bath. In the present paper are investigated and discussed the “plume zone” structures formed during injection with graphite particle of a molten steel bath and the metallurgical results obtained experimentally under the influence of the injection velocity.

• Periodical: Key Engineering Materials (Volume 660)
• Pages: 113-119
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.660.113
• Online since: August 2015
• Authors: Victor Geantă*
• Keywords: Alloying, Penetration Critical Speed, Plume Zone, Powder Injection, Structure

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