Steel ladle composite working lining and repairing method for slag line position thereof

Abstract

The invention relates to a steel ladle composite working lining and a repairing method for a slag line position thereof. The steel ladle composite working lining comprises a steel ladle shell, a permanent lining insulating refractory plate and permanent lining castable are arranged on the inner wall of the steel ladle shell, the upper portion of the permanent lining castable at the ladle bottom is provided with ladle bottom working lining castable, ladle wall working lining castable, a slag line part, single-ring ladle opening bricks and ladle edge castable from bottom to top, and water gap seat bricks and air permeable seat bricks are arranged in the ladle bottom working lining castable; the slag line part is arranged to be divided into an inner ring and an outer ring, and the inner ring comprises slag line bottom inner ring bricks and slag line inner ring alumina-magnesia-carbon bricks from bottom to top; the outer ring comprises slag line bottom outer ring bricks and slag line outer ring magnesia-carbon bricks from bottom to top. When the slag line position of the steel ladle composite working lining is subjected to the first minor repair, the second minor repair and the first medium repair, the used slag line bottom inner ring bricks and the slag line inner ring alumina-magnesia-carbon bricks are reserved, only the slag line bottom outer ring bricks and the slag line outer ring magnesia-carbon bricks are dismantled and replaced, and therefore the consumption of the working lining slag line magnesia-carbon bricks is reduced.

Description

technical field [0001] The invention relates to a ladle composite working lining and a method for repairing the slag line part thereof, and belongs to the technical field of iron and steel metallurgy ladle inner lining repair. Background technique [0002] The steel ladle has been developed from the traditional container for shipping molten steel in steelmaking to the basic container for LF, RH and other refining outside the furnace. The inner lining generally includes permanent lining and working lining. The cost of refractory materials per ton of steel is more than 30%. Therefore, in today's meager profit survival of iron and steel enterprises, the development of high-life and low-cost ladle working lining technology is of great significance for iron and steel enterprises to tap potential and increase efficiency and improve product profitability. In recent years, in order to meet the requirements of RH refining furnace development and production of ultra-low carbon on the...

AI Technical Summary

Problems solved by technology

In recent years, in order to meet the requirements of RH refining furnace development and production of ultra-low carbon on the process control of molten steel temperature drop and carbon increase, the slag line of the RH ladle is built with magnesia-carbon bricks, and the cladding wall and bottom below the slag line are made of The integrated working lining of corundum-spinel castable is the low-carbon working lining of ladle widely used at home and abroad at present, but the existing ladle working lining structure design and repair method have the following problems and deficiencies: (1) slag line The magnesia-carbon bricks are all made of one material and designed with a single-ring structure. In order to ensure the safe performance of the working lining of the ladle, whenever the residual thickness of the magnesia-carbon bricks at the slag line reaches 50-80 mm, they must be completely removed and replaced with new magnesia-carbon bricks. bricks, resulting in the waste of magnesia-carbon bricks with a residual thickness of 50-80mm, which increases the consumption and cost of magnesia-carbon bricks; Magnesia carbon bricks cannot be replaced during minor repairs, thus reducing the continuous service life of the ladle working lining after minor repairs

Insufficient of the invention: when the working lining of the ladle is repaired slightly, the single-ring magnesia-carbon brick (3) at the lower part of the slag line cannot be replaced, which will reduce the service life of the working lining after minor repairs. Afterwards, it is prone to peeling problems, which will reduce the number of cycles

The disadvantage of this invention: the magnesia-carbon bricks of the ladle slag line are all designed with a single-ring structure. When the first and third off-line minor repairs are carried out, except that the 2-3 layers of magnesia-carbon bricks in the lower part of the slag line are not removed, the rest of the slag line Magnesia carbon bricks are removed and replaced, which increases the consumption and cost of magnesia carbon bricks

Insufficient of the invention: the digging and mending process requires high requirements, the technical difficulty is high, the safety performance of the working lining of the ladle after the dredging and mending is reduced, and ladle wear accidents are prone to occur

Insufficient of the invention: the magnesia-carbon brick of the ladle slag line adopts a single-ring structure design. In order to ensure the safe performance of the working lining of the ladle, the magnesia-carbon brick at the slag line must retain sufficient erosion residual thickness, thereby increasing the magnesia-carbon brick. consumption and cost

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