DE1646576B1 - RAMPING MASS FOR METALLURGICAL OVENS - Google Patents

Claims (1)

1 2 Claim: Desirably for an immediate washout Essentially made of sand or dolomite and / the applied ramming mass. or carbon in the form of coal or coke, which is the object of the invention with tar as a binding agent and with the addition of the shortening of the hardening time of the refractory a phenoplast precondensate existing fire 5 ramming mass. solid ramming mass for metallurgical furnaces, the object is achieved according to the invention by characterized in that they have one that essentially consists of sand or dolomite Addition of 2 to 4% novolak with 15 to 50% and / or carbon in the form of coal or coke, Has hexamethylenetetramine. with tar as a binder as well as with the addition of a ίο Phenoplast precondensate existing refractory Ramming mass for metallurgical furnaces 2 to 4% The invention relates to a sand essentially made of novolak with 15 to 50% hexamethylenetetramine or dolomite and / or carbon is put into shape. of coal or coke, with tar as a binder and such masses are sufficient in the hardened state with the addition of a phenoplast precondensate, the requirements placed on them with regard to temperature are met Refractory ramming compound for metallurgical temperature resistance and mechanical strength Ovens. and have compared to previously known ramming masses With such ramming masses, among other things, the hardening times are significantly shorter. The shorter ones metallurgical furnaces delivered. The ramming mass hardening times are particularly evident with in are also used to patch the refractory 20 operating metallurgical furnaces as an advantageous lining of metallurgical furnaces and for sticking because of the downtime after the furnace repair Closing the stitch holes. or shortened accordingly after tapping It is already known that pure carbon tamped masses can be produced, resulting in a higher melting rate, for patching up cracks in walls made of coal - based on the furnace, results. Especially with Verstoff, those made of coked anthracite, furfural, use the ramming compound according to the invention for if necessary, anthracene oil and sulfuric acid exist. Closing the blast furnace tap can also be used and otherwise free of mineral substances and personnel can be saved, since the previously one hour other impurities should be, their removal and longer after the closing of the tap before the The hardening period is 7 days (British taphole tamping machine left in place now Patent 647,440). The use of syn- 30 can be removed after about 10 minutes, thetic resins as a binding agent for so that more time for the preparation of the next one Refractory mass is available in the French patent tapping sees. 1 319 985 proposed. The usability that hexamethylenetetramine for the hardening of of epoxy resins, including phenolic resins, contributing to phenolic resins, is known per se (Kunststoffais Binders for various areas of application 35 Lexikon, 1958, p. 127), but this has been used up to now can be found in "ABC-Chemie, 1965, p. 368". In just that in standard novolaks anyway Uli mann, "Technische Chemie", Vol. 9, 1957, contained in the order of magnitude of 5 to 15% P. 785, it is mentioned that phenolic resins are made from hexamethylenetetramine as binders. The surprisingly short hardening times that can be found in the manufacture of electrodes. Also from the German Auslegeschrift 40 beaten refractory ramming mass 1 213 334 is only the usability of epoxy, but only if hexamethylenetetramine is present in the resin, including phenolic resins, as a binding surplus,
means in the production of moldings from material. In addition, the excess to be taken from carbonized cellulose. In connection with hexamethylenetetramine, those containing hydroxyl groups with the refractory masses according to the French 45 cyclic hydrocarbons of tar at the Patent 1 319 985 and involved after the German hardening, from which in addition to the shortening of the Legeschrift 1 213 334, hardening times of hardening time are higher temperature resistance 8 hours and more indicated. and greater mechanical strength of the hardened When relining metallurgical furnaces, ramming material results. the hardening of the refractory mass is brought about by heating the furnace. When patching the fire-written:
solid lining and when closing the stitch- ~. , -, hole, the hardening by the furnace inne- ^The base material, namely causes living warmth. Especially with 85% fine sand, mend the refractory lining and when closing 55 15% red tar, of the needle hole is a short hardening time of 100 ° / _Was patching or comparable to close the tap hole _m £ _{ner mixing screw with}
turned ramming mass desired. "",. . ^ _T,,, "", The known ramming masses of the initially 3% powder-orange novolak (of which 30% cracked composition have hardening times 60 hexamethylenetetramine), based on the on the order of an hour. This basic mass, Period of time must be thoroughly mixed, especially after closing. With the for a majority of The needle hole must be allowed to pass before the branch has sufficient mass after the needle hole pounding machine is removed or before re-melting is started with successive tapping in a 9-m blast furnace when the tap hole is closed in each case. Already 10 minutes you don't want to run the risk of the furnace breaking through - after the tap hole was closed, the outbreak was. If it is a question of patch points, the hardening of the introduced mass is completed, and Premature restart of the furnace in and the tap hole tamping machine could be removed.