Abstract
Paper presents the laboratory research results about effect of alloying, modifying and fluxing agents, in amount corresponding to consumption standards and used at the RUSAL aluminum smelters, on hydrogen saturation of aluminum melt. In paper the comparison is made between hydrogen measurement results obtained by express analysis of liquid aluminum using an Alu Compact instrument and data of solid aluminum from specialized highly sensitive magnetic mass spectrometer AV-1. As a result of studies, it was found that the maximum of aluminum hydrogen saturation occurs when using powder refining fluxes and alloying agents containing halides of alkali and alkaline earth metals, some of which form crystalline hydrates. It was shown that powder fluxes and alloying agents with flux components contain crystallization and hygroscopic water and, when they are added to melt, increase the concentration of hydrogen in metal by 35-100%. According to the research results, technical solutions are proposed with the aim of reducing the saturation degree of aluminum melt with hydrogen. One of the most effective solutions is to use fused flux lump. The following points were proposed as technical solutions to reduce the saturation degree when alloying, refining, and modifying agents added to melt: make use of fused lump refining and cover-refining fluxes and retreat from powder fluxes; provide incoming control for fluxes and alloying agents containing fluxes; to store fluxes and alloying agents with halides of alkali and alkaline earth metals under conditions that exclude hygroscopic moisture saturation; to increase the consumption of fused refining fluxes by 1.5-2 times during preparation of aluminum-magnesium alloys.The work was performed within the framework of the state assignment for science of the Federal State Autonomous Educational Institution of Higher Education “Siberian Federal University”, project number FSRZ-2020-0013.
Published Version
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