Optimisation of hot metal desulphurisation at BOS2 Corus Strip Products IJmuiden

Visser, Hessel-Jan; Boom, R.; Graveland, E.; Overbosch, A.; Knorren, L.

doi:10.1051/metal:2006127

Cited by 1 publication

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“…Calcium oxide, calcium carbide, and magnesium are the agents commonly used for this task. A number of research works on hot metal desulfurization can be found in the literature . Although magnesium and magnesium–CaO mixtures have been used with success in steel plants, the mechanism of the desulfurization using these agents is still not well known.…”

Section: Introductionmentioning

confidence: 99%

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Functions of Mg and Mg–CaO Mixtures in Hot Metal Desulfurization

Lindstrom

Nortier

Sichen

2013

steel research int.

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The mechanisms of hot metal desulphurization using Mg and Mg-CaO mixtures were studied in a newly designed setup. It was found that most of the added Mg quickly escaped in 2 seconds. MgS was not formed by homogeneous nucleation but by its formation on the MgO particles originated from oxide shell of the Mg particles. When tiny CaO particles (Flucal) were added together with Mg, the particles efficiently transformed to CaS. It was found that Mg-gas helped the distribution of the CaO in the hot metal and improved the kinetic condition. Most of the CaO particles smaller than 10 μm were completely transformed to CaS whereas CaO particles >10 μm still had CaO in the centre after 20 s. The CaO particles as nuclei were also found to help Mg gas in forming MgS. Under the present experimental conditions, a mixture of about 20-30mass% Mg-80-70mass CaO % provided a good utilization of the flux. The reaction products distributed quite well over the whole sample. However, this ratio would need further study in a reactor, as the kinetic conditions would differ considerably. The optimized ratio is expected to be a function of the size and geometry of the reactor, the position and the depth of the addition, the manner of addition and more.

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Section: Introductionmentioning

confidence: 99%

“…Whether Mg functions in the form of gas bubbles taking down the sulfur content directly or by increasing the sulfide capacity of the slag is always a question. In some of the tests, Mg addition is accompanied or followed by CaO or CaC 2 additions . How the different agents help each other in desulfurization is still uncertain.…”

Section: Introductionmentioning

confidence: 99%