LOW-SILICON LIQUID METAL : NEW DESULPHURIZING AND DEPHOSPHORIZING TECHNIQUES
Experimental work now under way indicates the need to reduce the Si and P content, as well as the S, before the hot metal enters the steel shop. This simplifies subsequent operations and quality control in continuous casting. The pretreatment of the hot metal is determined by its characteristics when it is tapped, especially its Si content and temperature. The aim of this research has been to develop a de-P process that is as simple as possible from the plant and operational point of view and does not cause any interference with movement of the hot-metal to the steel shop. A continuous de-P process has been developed for application at the torpedo-car filling-station in the cast house. The de-P agent consisting of iron oxides and lime, is fed into the stream of hot metal at the end of the tilting runner, thus exploiting the energy of the drop into the torpedo car. Where de-S is concerned, the aim has been to improve management of the relevant plants. Statistical analysis covering 5000 treated torpedo cars has permitted quantification of the effect of the injection flow rate and hence of treatment time.
Bibliographic Reference: EUR 12170 IT (1990) 93 PP., MF, ECU 4 THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Record Number: 1989128035700 / Last updated on: 1992-08-10
Original language: IT