In steelmaking converter, the application of high temperature cement is mainly reflected in the following aspects:

I. Building firebricks

High temperature cement is used to build refractory bricks for converter lining, especially magnesia-carbon bricks. This kind of cement can maintain good bonding performance in high temperature environment, ensure the close combination between refractory bricks and prevent the erosion of high temperature slag. For example, a kind of fireclay specially used for replacing tuyere bricks of converter has self-flowing heat, which can automatically fill gaps when the temperature rises, and form high-strength carbon bond after curing, thus effectively preventing breakout accidents.

II. Repairing furnace lining

High temperature cement is used to repair the local damage of furnace lining in the daily maintenance of converter. For example, the lining of converter is prone to wear and erosion under long-term high temperature and mechanical impact, so high temperature cement can be used for rapid repair. This cement has good corrosion resistance and high temperature strength, and can restore the integrity of furnace lining in a short time.

III. Replacement of tuyere brick

In the replacement process of converter tuyere brick, high temperature cement plays a particularly important role. It can not only cure quickly, but also form a firm bonding layer at high temperature to ensure the close combination of tuyere brick and furnace body. When the temperature rises, this kind of cement can fill the gap by itself, further improving the sealing and corrosion resistance.

IV. Shotcreting and hot patching

In the process of hot repair of converter, high temperature cement can be used for gunning or hot repair. For example, the magnesia-carbon hot patching material is poured into the converter through the hopper, and the binder is liquefied by the waste heat of the converter, so that the patching material can quickly flow to the area needing maintenance and solidify. This repair method can restore the performance of furnace lining in a short time and reduce the shutdown time.

V. Environment-friendly repair materials

With the improvement of environmental protection requirements, some new types of high-temperature cement have been developed for the green maintenance of converters. These materials do not produce toxic smoke when sintered at high temperature, and have higher compactness and erosion resistance.

VI. Method of use

Mixing and daubing: Before use, the components of high-temperature cement should be stored separately. When used, they should be evenly mixed according to the specified proportion and daubed on the parts that need to be repaired or laid.

Construction temperature: during construction, it is necessary to ensure that there is a certain temperature in the converter so that the cement can be solidified quickly.

Sintering time: According to different repair materials, the sintering time is usually between 10 minutes and 60 minutes.

The application of high temperature cement in steelmaking converter not only improves the durability and corrosion resistance of lining, but also reduces the maintenance time and cost. It is an indispensable refractory in modern steelmaking production.