The economy of modern steel enterprises is booming, and the demand for refractory materials has also greatly increased. At the same time, there are various types of refractory materials on the market. The selection and construction of refractory materials should be adapted to local conditions. The construction methods of refractory materials are also different according to the kiln environment, use location, use temperature, and erosion properties. Choosing reasonable construction methods and strict construction quality control measures are the key to ensuring quality and construction schedule. , the key to reducing costs. A series of operations during the operation of industrial kilns have a huge impact on the quality of refractory materials, which is related to the longevity of industrial kilns.
Quality accidents during the construction of refractory materials are mainly manifested in the following aspects:
First, the refractory material hardens too quickly or too slowly. After the materials are mixed, the material hardens too quickly during the pouring process, which can easily cause pipe blockage or even dead pouring equipment, resulting in delays in the construction period and waste of materials. The other is that the material hardens slowly or even does not harden at all, which seriously hinders the construction process and makes the construction progress uncontrollable.
The second is the unbalanced proportion of refractory materials. During the mixing and construction process of refractory castables, adding too much solvent or water can easily cause the material to be thin and prone to segregation, which in turn affects the strength of the castable body.
The third is the phenomenon of mold running during the construction of refractory castables. Refractory castables have a large specific gravity and good self-flowing properties, and the static pressure on the mold during pouring is very large. Factors such as the mold support being too high, the formwork reinforcement being unreliable, and the external load of the cross-working scaffolding being large, there is a risk of mold running during the pouring construction of refractory materials. Therefore, the refractory material pouring needs to be cast in stages.
Fourth, cracks in the pouring body after pouring or baking. The pouring thickness in the construction design is not enough; the material selection does not match the working conditions; the foundation is not thoroughly cleaned, and there are interlayers, etc., all of which may form penetrating cracks.
Measures to prevent and solve refractory material construction quality accidents are as follows:
First, before materials leave the factory, they must undergo strict quality inspections to eliminate defective and unqualified refractory materials. Strictly control quality, continuously improve production processes, control production from the source, and strive to improve product quality.
The second is to make test blocks on site, adjust the proportion of binder or water addition, and construction can only be carried out when the test blocks meet the design requirements;
Third, it is necessary to ensure that there is no power outage and construction is not interrupted during the construction of castable materials.
Fourth, the amount of binder or water added to refractory castables should be strictly controlled in accordance with the instructions for use and must not exceed the limit.
Fifth, after arriving at the construction site, the refractory materials should be stored in a ventilated and dry place, and measures should be taken to prevent rain and moisture.
Sixth, the poured body after pouring cannot be subjected to pressure or shock before solidification.
Seventh, after the pouring construction is completed or the oven is baked, if there are cracks or penetrating network cracks with a width greater than 5mm in the refractory castable, they must be repaired.
The impact of blast furnace operation on refractory materials is as follows:
First, the blast furnace is frequently stopped and started. The thermal expansion and contraction can easily cause the refractory material to fall off and the cracks in the pouring body to become larger.
Second, the cooling equipment leaks, which can cause premature damage to the refractory materials in the furnace and greatly reduce the life of the blast furnace.
Third, the blast furnace conditions are abnormal (the pressure difference in the blast furnace increases; the quality of raw fuel decreases; the operation of the blast furnace itself
Reasons, etc.), the loss of refractory materials is more serious.
Countermeasures to reduce the impact of blast furnace operation on refractory materials include opening the blast furnace to quickly reach production, which is most beneficial to refractory materials; reducing furnace abnormality is a kind of protection for refractory materials.
In short, we must strictly control the quality of refractory material production, enhance the professional quality of construction personnel, and strictly control construction quality, thereby reducing the occurrence of quality accidents during the construction process. At the same time, by using new technologies to open the blast furnace, the blast furnace can quickly reach production and efficiency, which not only creates objective benefits for the blast furnace system, but also has the most direct protective effect on refractory materials, laying a solid foundation for the longevity of the blast furnace.