For one of our customers, we developed an integrated hoisting system in which all the linings are already joined together outside the ladle and then moved into it as a unit and fitted there. This solution not only minimizes possible installation damage but also saves a considerable amount of time, thus helping to make our customer's production processes more efficient.
In order to extract a maximum of the contained metal from the mined ore, mechanical, chemical as well as thermal treatments and extraction processes can all be used for this purpose. In the case of thermal processes, graphite is the material of choice and it plays a decisive role thanks to its specific material properties.
The furnace must be opened by means of tapping electrodes (Stinger Pencils) before the melt is poured into crucibles via tapping spouts. The charged electrodes, which have a diameter of 75 millimeters and a length of 2,750 millimeters, create an arc which discharges the refractory material at the prescribed opening thereby enabling the melt to run off.
Once poured off, the melt flows into the designated ladle. To protect its steel body, it is given a lining of refractory material. Graphite is the preferred material for this purpose although, it must be ensured that it does not bond with the melt as impurities must absolutely be avoided. Moreover, the formation of a bond with the refractory cement which fixes the graphite lining in the steel body must not be put at risk.
Whether 2.75 meter electrode for tapping tasks or a variety of linings for very different underlying conditions – our products impress with their extreme resistance and reliability.
In addition, you will benefit from our extensive experience in calculation and design geared to achieving the longest possible service life.
The manufacture of tapping electrodes - or stinger pencils - presents a major challenge as these extremely long, thin objects can easily bend. Based on our experience with the material and in manufacturing, we developed a type of graphite in which the tendency to sag remains under 0.5 cm in terms of the total length – clearly the top performer in its class.
The combination of material and length of the electrodes for furnace tapping we offer allows an accurate approach to the opening by the operator and a greater safety distance from the furnace. Further advantages are a uniform resistance and arcing behaviour as well as less time needed for changing the electrode, a longer cycle time and easy workability for establishing contact.
Depending on the parameters of the melt process and the properties of the metal or alloy concerned, different grades of graphite will be suitable for the lining.
We offer a broad range of graphite types including variable post-impregnation grades and dimensions, an notably large formats such as 600 x 600 x 3300 mm and 500 x 500 x 2750 mm.
The melt has to be kept warm after processing in order to avoid any change in viscosity or premature stiffening. Heat-retaining electrodes are used for this purpose.
Our rounds of extruded fine-grain graphite are particularly well suited for such assignments.
Thanks to their material properties such as resistance to the high application temperatures and their high thermal shock resistance, our specialty graphites are ideal materials for melt treatment.
Product Finder for SIGRAFINE Fine-Grain Graphite
Our Product Finder can help you pre-select the appropriate graphite grades for your application.