Sollac (societe Anonyme)

Usinor Sacilor

Eurecat S.a.

Irsid

Unimetal

Eco'ring

Institut De Recherches De La Sigerurgie Francaise

Institut De Recerches De La Siderurgie Francaise (irsid En Abrege)

Jean-Luc Roth

Herve Sierpinski

Henri Gaye

Ghislain Maurer

Jacques Michelet

Philippe Destannes

Christian Lebrun

Yann De Lassat De Pressigny

Michel Hamy

Lionel Picard

Jean-Michel Thebault

Thierry Bernet

Jean Alex Michard

Yves Zbaczyniak

The invention includes a method for treating a spent catalyst containing at least one refractory mineral oxide, one or more metals in the form of sulfide(s) chosen from the following metals: molybdenum, nickel, cobalt, tungsten, vanadium, and carbon compounds, the method comprising:

Method for recovering metals contained in spent catalysts from ferro-alloys

Process for adjusting the composition of a liquid metal such as steel,

Process for smelting steel in an electric arc furnace, and electric arc

Both a method and apparatus for producing molten steel are provided wherein ferrous materials rich in carbonaceous materials are fused in a first vessel of a single electric furnace having separate first and second vessels. The carbonized molten metal thus obtained is then pretreated in a separate pretreatment facility to remove contaminants and the pretreated molten metal is then decarburized in the second vessel of the electric furnace. The decarburization of the pretreated metal in the second vessel of the furnace avoids reintroducing contaminants into the steel by avoiding contact between the pretreated metal and the slag produced when the initial carbonaceous materials are fused. Preferably, the first and second vessels are two vessels of a single electric furnace having a single electric power source.

Method and installation for producing molten steel from ferrous

The device for charging metalliferous materials 7 into a furnace 3 compri a charging tube 1, inside which are arranged supports 8 distributed over an entire non-straight section of this, for example similarly to the stairs of a flight of stairs descending towards the furnace. Passages are provided between the supports 8, and means 10 for the vibration of the supports are provided. The materials progressively descend on the supports 8 towards the furnace and are simultaneously preheated by the hot gases introduced into the tube, circulating through the materials and via the passages 9 and extracted via the outlet orifice 5.

Device for the charging of materials into a furnace and the preheating

Device for temperature homogenization of passing metallic products (3), housed in the bed plate of the temperature equalization zone of a reheating furnace and constituted by elongated polyphase static sliding field inductors (14) located in the extension of elements (9) supporting the metallic products in the heating zone (7) of the furnace. The device achieves efficient and rapid heating by enabling precise localization of the heating zone in a predetermined part of the metallic product to be treated, and is particularly useful for treating large dimension products, such as large slabs, in order to attenuate or eliminate skid marks (20) which are usually present upon their emergence from prior art reheating furnaces.

Device for the homogenization of the temperature of passing metallic

Metal bodies such as billets and blooms are reheated for rolling in a metal-refining operation having a blast furnace by first heating the top gas of the blast furnace to at least 800.degree. C. by means of a plasma torch, then, before the gas has cooled appreciably, burning the heated top gas in a preheating chamber. The metal bodies are exposed in the preheating chamber to the heat of the burning and heated top gas. The heated top gas is mixed with combustion-inducing gas to burn it. Before it is mixed with the heated top gas it is preheated by heat exchange with combustion-product gas withdrawn from the preheating chamber. In this manner it is possible to raise the temperature of this combustion-inducing gas to at least 600.degree. C., so that the burners firing the preheating chamber burn clean. In addition much of the heat of the process is recovered, again reducing energy costs for the system.

Reheating metal bodies with recovered blast-furnace energy

Growing community of inventors

Metz, France

Jean-Luc Roth