Sintering problem of ramming material for intermediate frequency furnace

The quality of the ramming material of the intermediate frequency furnace has a direct impact on the smelting efficiency. A good furnace wall lining can be smelted 600 times. The worst is more than 100 heats, and even dozens of heats have to be re-knotted. Frequent knotting of the furnace wall lining not only affects the production efficiency, but also wastes money on knotting the charge. The following is the correct method of knotting from the manufacturer of dry-tying materials. …

1. The role of the temperature sensor

In the sintering work, the overall temperature control is very important. In order to clearly understand the temperature in the furnace, we will connect 2-3 temperature measurement points at the bottom and the middle in advance, and carry out our sintering process according to the detected temperature.

2. The addition of the first batch of charge for the lining of the furnace wall for sintering

For the first batch of charge before the sintering process, we must give priority to the chemical composition of its material, because the main material of our quartz sand furnace wall lining is silicon oxide, and from the analysis of thermodynamics, C and Si are A balance ratio is required at a certain temperature. When the molten iron temperature is higher and the C content is also high, the Si content of the molten iron needs to be greater, because we need a 1580-1600 degrees during the sintering process of the furnace wall lining During the holding time period, if the molten iron contains high C content and the Si content does not reach the required balance ratio, the molten iron will accelerate the extraction of silicon from the furnace wall lining to balance this ratio, resulting in the furnace wall lining Premature erosion and thinning affects its service life. Also, if the contents of C and Si in our first batch of ramming materials are low, the higher temperature will cause the increase of the amount of iron oxide and manganese oxide, and these oxides will interact with our furnace wall lining. The silicon dioxide on the surface reacts to form iron silicate and manganese silicate, and the melting points of these two substances are below 1350 ℃, and also make our furnace wall lining thinner prematurely and reduce the service life. …

Taking into account the above two points, the other is to consider the density of the ramming material added. The entire melting process of our electric furnace is that the electric energy is transformed into magnetic field energy through the coil, and then the magnetic field reacts with the metal charge to transform into electric energy, and then from electric energy to electric energy. A conversion of heat energy, because the crucible is a metal mold crucible when the furnace is oven, if the feeding space inside the furnace is loose, the crucible part will over-react to the magnetic field, causing the heating to be too fast, causing deformation and bulging inward (the part is also affected by the thickness of the crucible mold. At this time, the quartz sand lining of the furnace wall has not yet been sintered and solidified, and the refractory material will fill the deformed space of the mold, resulting in a decrease in the density of the furnace wall lining material and affecting its service life.