Liquid crude metals have to be refined (and often alloyed) before casting or solidification. In the steel industry, the hot metal from the blast furnace is converted into liquid steel in the Basic Oxygen Furnace (BOF). In this process, in order to achieve shorter tap to tap time and hence higher productivity, process events related to the control of the melt analysis such as stop of the oxygen blow, lance withdrawal or vessel tilting have to be avoided. A new method for controlling the BOF without an expensive sub-lance system has been proposed by CRM Group, involving the use of an original in-blow heterogeneous sampler simultaneously collecting slag and steel, combined with a dedicated laser analytical method.
About 40% of steel production is nowadays based on the recycling of steel scrap in the Electric Arc Furnace (EAF). There is a strong aim to further increase this percentage in order to maximise the resource and energy efficiencies of the steel sector. This will only be possible if robust solutions are put in place to cope with higher use of lower and more variable quality scrap while keeping process performances and product quality under control. The CRM Group has developed several solutions in that respect : various tools for the monitoring of scrap quality and dedicated sensors for the control of the EAF process, combined with a unique on-line process model. The latter is also available for other applications like the assessment of the value-in-use of melted materials, or of the optimal configuration of new lances or injectors.