Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Consideration of Dissolution Behavior of Elements in Steelmaking Slag Based on Their Stability Diagram in Seawater
Takahiro MIKIKiyoteru SHITOGIDENYusuke SAMADATetsuya NAGASAKAMitsutaka HINO
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2003 Volume 89 Issue 4 Pages 388-392

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Abstract

Stability diagrams for Ca, Mg, CO2, P, Si, Fe and F in seawater have been estimated to understand the dissolution behavior of steelmakingslag constituents into seawater as nutrition for phytoplankton propagation. Dissolution behavior of each element from crystal phase present in steelmaking slags into seawater has been discussed based on the stability diagram. The presence of 4CaO·P22O5phase in steelmaking slag is preferred for effective phosphorus dissolution into seawater. Increase of pH value by Ca elution and buffering action of Mg in seawater against it have been clearly explained by using stability diagram. Elution behavior of environmentally restricted elements from steelmaking slag into seawater was also estimated. It was confirmed that stability diagram was a powerful tool to understand dissolution behavior of steelmaking slag.

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© The Iron and Steel Institute of Japan
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