DE956230C - Production of dolomite in metallurgical furnaces by ramming or shaking - Google Patents

Description

Production of dolomite in metallurgical furnaces by ramming or shaking. B. from Siemens-Martin- or electric furnaces, in such a way that fine-grained sintered dolomite with such as the size of a grain of rice mixed on the hearth of the oven and pounded is completed. No liquid is used as a binding agent, and the sintered dolomite is introduced and tamped in layers.

It has also been suggested to use the sintered dolomite for this purpose to be used in the precisely prescribed grain size, but without further information about the grain size to be used made wounds. In all cases, however, the application is of a Dolomite mountain is laborious and time-consuming.

According to the invention it is possible to use dolomite earth from metallurgical furnaces, in particular from Siemens-Martin or electric ovens, in a simple and less time-consuming way by pounding, d, first ate the coarse-grained sintered dolomite, then the medium grain and finally the fine grain is brought to the stove; on what the applied mass is solidified by pounding or shaking .. Depending on the With the coarsest grain size, it is possible to use fewer layers for a prescribed one Thickness of the hearth. apply to must or in certain cases with a single layer to get along, where previously several layers had to be used. It was further found that a grain structure in which the gaps between the individual Grain types each amounted to a multiple of the previous grain size, especially showed good results. Here can. das Feinkorn, das. Mittel- und; , the coarse grain each amount to a third of the total mass in terms of space or weight. example To stamp out the hearth of a Siemens-Martin oven, the entire Coarse grain, one third of the weight of the whole Herdau.sompung and one Dimensions from 30 to 60 mm, filled on the hearth, then after leveling of this layer, the medium grain, which is one third of the total weight for one dimension from 5 to 10 mm, and then the fine grain as the remainder with a dimension of o introduced up to about 1/2 mm. After the surface was trimmed accordingly, it began tamping by hand, roughly half that with the same number of assistants Time like earlier with pounding out in layers. The stove was sounding hard and of low porosity. For further matching of the surface and a thin layer was made for faster sintering after commissioning Hartherd dolomite, the one with highly basic, iron oxide-rich Siemens-Martin slag was mixed, applied and tamped down. The sintered dolomite used came from the rotary kiln.

Claims (4)

PATENT CLAIMS: i. Process for the production of dolomite clay in metallurgical furnaces by ramming or shaking, characterized in that the hearth is built up as a whole or in layers in such a way that first the total mass of coarse grain, then that of medium grain and finally that of fine grain is applied, followed by tamping or shaking begins. 2. Grain structure for a sintered dolomite mass for ramming stoves of metallurgical furnaces for the purpose of claim i, characterized characterized in that the structure has gaps between the individual types of grain and that these gaps are a multiple of the previous grain size. 3. grain structure according to claim 2, characterized in that the proportion of coarse, Medium and fine grain each amount to a third of the space or weight of the total mass. 4. Grain structure according to claim: 2 and 3, characterized in that the coarse grain has a dimension of 30 to 60 mm, the medium grain has a dimension of 5 to 10 mm and the fine grain has a dimension of o to 1/2 mm. Documents considered: German Patent No. 75o 6jo; JH C he s te rs: "Steelplant Ret: ractories", Sheffield, 1946, pp. 370 and 371.