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What refractories do hot stoves use?

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What refractories do hot stoves use?

Date of release:2019-06-08 Author: Click:

xModern blast furnace ironmaking requires that the hot blast stove not only provide high blast temperature, but also its life should be synchronized with that of the first generation of blast furnace, that is to say, the life of the first generation of blast furnace should be more than 15 years. Insulation Brick Manufacturer

The performance of refractories plays a decisive role in these two aspects. The properties of refractories used in hot blast stoves can be divided into thermal properties, including refractoriness, thermal expansion and volume stability, heat capacity, thermal conductivity, and mechanical properties, including charge softening temperature, high temperature creep, thermal shock stability, etc. The performance indexes of refractory bricks commonly used in hot blast stoves (stipulated in the national standard) are listed in Table 1-1. High temperature creep property should be paid special attention to among the listed properties. Although it is not stipulated in the national standard, it is of great significance to the life of hot blast stoves. Refractories deform at high temperatures under constant forces below their critical strength over a long period of time, and the amount of deformation increases with time. This phenomenon is called creep. High temperature creep property is now an important index for selecting refractories in high temperature zone of hot blast stove. Long-term practice shows that the sinking of lattice brick in hot blast stove, the collapse of wall and partition wall of internal combustion hot blast stove are all related to creep.


The performance index of refractories for hot blast stoves in our country is very important to the thermal shock stability of refractories for ceramic burners of hot blast stoves. That is to say, the performance of refractories used for hot blast stoves is required to be high, which requires that they can resist rapid temperature changes without destroying. Generally, water cooling experiments should be done in laboratory. The times of quench and heat should be more than 70 times. At present, there are basically two types of refractory masonry structures in high-temperature hot blast stove (from high temperature zone to low temperature zone): creep curves of various refractories (1) silicon brick-low creep bauxite brick (mid-grade), one mat of bauxite brick-clay brick; (2) low creep high-aluminium brick (high-grade), one low creep high-aluminium brick (mid-grade), one bauxite brick-clay brick. Some hot stoves use andalusite or sillimanite bricks in the parts where low creep high alumina bricks are used. From the use effect and investment cost, the use of silicon brick (ball) at high temperature is better, because the creep rate of silicon brick is low, the volume of long-term use at high temperature is relatively stable, thermal stability is good, and the price is cheap.

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