Method and new lance for powder injection into liquid alloys

• Autorzy: Jezierski J. , Szajnar J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The pneumatic powder injection into liquid alloys is known since many years. It is use in many metallurgical processes (recarburization, alloy additions introduction, desulphurization etc.). The problem in some cases is to prevent the carrier gas introduction into liquid bath. Design/methodology/approach: The objectives were achieved by researches with laboratory injection stand. The main research method was measurement of stream parameters and computation of pneumatic injection indexes. Findings: The new injection lance was invented and analyzed and this is one of the main subjects of this paper. The lance has a construction, that makes possible even complete elimination of carrier gas introduction into liquid metal with proper particles stream range. The paper shows the results of the tests of lances with various geometrical parameters and model experiments with diphase stream force measurement. Research limitations/implications: The future research should be made with various type of powdered materials to find the question what are the limits of changing the most important parameters (grain size, stream concentration etc.). The limitation is number of values being analyzed (in powder injection processes there are many) in experimental plan. Practical implications: The lance can be used for powders pneumatic injection but only for small its quantities (e.g. microalloying) because non-immersed lance should be used with low stream concentration. The usage of that lance can decrease liquid alloy heat losses (not introducing carrier gas into liquid) and lance consumption (non-immersed in liquid bath). Originality/value: The original value of the paper is taking into account the parameter called by authors “diphase stream force” on liquid metal surface being “attacked” by particles (or carrier gas stream). Nobody (in author’s opinion) was analyzed that problem with connection in powder injection processes. The paper can be helpful for everybody who is studying pneumatic injection processes.

Słowa kluczowe

EN

casting; powder injection; diphase stream; stream forces

PL

odlewanie; wdmuchiwanie proszków; strumień dwufazowy

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 349--352
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Jezierski J.

• Division of Foundry, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Szajnar J.

• Division of Foundry, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

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• [14] J. Jezierski, Description of powder injection process by diphase stream forces, Proc. of the Third Scient. Conf. M3E’2005, Gliwice-Wisła, 2005, (in Polish), 537-540
• [15] J. Jezierski, Analysis of diphase stream forces in pneumatic powder injection, 14-th Metallurgical & Material Conference, 20-22.05.2005 r., Hradec nad Moravici, Czechy, 2005, on CD-ROM.
• [16] K. Janerka, Parameters in pneumatic recarburization process, Proc. of the Third Scient. Conf. M3E’2005, Gliwice-Wisła, 2005, (in Polish), 531-536.
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• [18] J. Jezierski, J. Szajnar, New injection lance construction for powder injection into liquid alloys, 15-th Metallurgical & Material Conference, 23-25.05.2006 r., Hradec nad Moravici, Czechy, 2006, on CD-ROM.