钢包内衬耐材的技术进步措施案例分享 ladle refractory layer long life case share
October 12, 2020
The ladle adopts casing , that is, when the lining erosion exceeds half of the original thickness, the residual steel on the liner is removed, the bottom of the ladle is filled first, and then the lining size is the same as the new liner. The times of use are similar to those of the new package. Because the recharge material is only 1/3~1/2 of the new lining material, a large amount of refractory consumption is saved. In the case of ladle without serious cold steel freezing accident, casing pouring can be continuously circulated, which basically realizes the zero discharge of residual refractories.
For example ,130 t ladle of Laigang adopt peeling sleeve pouring and repairing technology, and spray continuous lining welding technology is used for minor repair. After 3 minor repairs, the age of 4 times is more than 190 times, and the consumption of working lining refractories is reduced by 0.61 kg/t steel. After that, the working lining is peeled and cast in medium repair, and then the lining is renewed for 3 times. According to the cycle of 8~9 cycles, the working lining life of ladle pouring can reach more than 1500 times. If the castable is further optimized and the technology of casing pouring and spraying is further improved, not only the life of ladle is greatly improved, but also the zero discharge of residual refractory is basically achieved.
Steel ladle red envelope steel, accelerate turnover, prevent sticky slag
The ladle is lined with high aluminum and some alkaline refractories. The wall is easy to stick slag or nodule. With the increase of the number of times of use, the slag accumulates thicker and thicker, resulting in the decrease of effective volume and the increase of empty package weight. If you reach or exceed the lifting weight, it will bring safety risks to production. Serious slag had to be removed, so that the package age reduced, refractory consumption increased. Adopt red envelope to connect steel, speed up ladle turnover, reduce rapid cooling and heat, reduce lining crack, stick slag light. In order to speed up the ladle turnover, a steel ladle path plan, empty ladle walking path and heavy ladle walking path plan were worked out in a steel-making-refining-continuous casting steel ladle. Orderly scheduling of ladle and increasing utilization rate of red envelope not only reduce slag, but also reduce energy consumption
The reason of hanging slag of ladle is complicated, which is related to steelmaking process, steel grade, material and quality of refractory material, heat preservation of ladle, turnover speed of ladle and so on. Among them speed up turnover, red envelopes steel is more common method. Of course, some refractories are basically non-stick slag to all steel types, such as wax brick. Its erosion mechanism is mainly corrosion, contact with molten steel slag to form a high viscosity liquid layer, prevent slag penetration, and after heating has the advantages of micro-expansion, good lining integrity and so on.
Secondly, the slagging of ladle mouth can not be ignored, which will reduce the effective area of ladle mouth and cause the slag to be unclean. Often use oxygen cutting or mechanical removal, most will destroy the lining, but also consume a lot of labor.