Selection of high-temperature furnace refractories

With the rapid advance of industrialization, brought rapid development of cement, glass, chemicals, metallurgy and other high-temperature industrial, China's refractory material industry has entered a rapid development stage. At the same time, people are concerned about not only the right choice according to the specific working conditions suitable high-temperature furnace

Refractory, and further explore what kind of refractory material can only guarantee the life of the furnace and can reduce costs.

Hot work departments are required to have resistance to high temperature refractory heat load performance, but due to different job sectors, even in different parts of the same kiln, the working conditions are not the same. Following is a brief introduction to the following:

A technically meet the requirements of working conditions: the selection of refractory materials, must take into account the working conditions in various parts of the furnace, such as magnesia carbon bricks properties
 furnace temperature level, changes in circumstances, the nature of the slag, and the situation was slag and molten metal baking mechanical friction or erosion. For example build lid, in addition to resistance

Outside temperature, but also has good thermal stability, otherwise, due to the frequent opening and closing the lid, can lead to the destruction of bricks, slag and against the requirement is secondary. On the contrary, in the vicinity of the slag line refractory company slag resistance must meet the requirements. All in all, the choice of suitable refractory

.

(A) I produced the high-temperature furnace refractories are the following:

1. zirconia zirconia brick products are the company fused zirconia sand as raw material, with a special high-temperature sintering. Zirconia brick has a high temperature (the highest temperature ≥2500 ℃), acid erosion, thermal shock resistance and other characteristics, widely used in military, scientific research

, Ultra-high temperature Ladle Backing Layer Castables metal smelting furnace, laser crystal, quartz glass, electronics and other industries and iron and steel casting and other occasions. Examples of key parts of the glass furnace AZS chrome material, medium-sized cement kiln cooling zone, the transition zone using zirconium Refractory like.

2. products corundum brick corundum pure white fused corundum, mullite, chromium oxide and other raw materials, sintered after molding, high temperature. Products with compact structure, high strength, high temperature (≥1790 ℃), good thermal shock resistance, acid and alkaline gases erosion,

From H2, CO and other reducing gas effect. High purity alumina bricks are widely used in petrochemical and other industries of oil or gas gasification furnace, high temperature furnace carbon black reactor ethylene gas furnace, ammonia decomposition furnace, chemical industry, refractory materials and ceramic industries; chromium corundum brick applied petrochemical industry, coal water

High temperature furnace lining pulp and petroleum coke gasifier backing, oil or gasifier working lining, carbon black reactor lining in the chemical industry, refractory industry; mullite corundum brick is widely used in carbon black reactors, refractories, ceramics, electronics industry, high-temperature furnace lining.

3. alumina article is a hollow ball of alumina brick alumina hollow ball, corundum powder, calcined powder as raw materials, homogenized, molding, high temperature sintering. Products with high temperature, acid erosion, low thermal conductivity, good insulation properties, low bulk density and other characteristics, the main

To be used for ceramics, porcelain, grinding wheels, refractories and other various high-temperature industrial furnace lining and insulation lining work.

(B), in short, regardless of which refractory Indexes in terms of high-temperature furnace must consider the following points:

1. The effect of changes in resistance and high-temperature vacuum work atmosphere, non-volatile, no damage. It requires a material having a low vapor pressure and high chemical stability.

2. The high-temperature heat resistance combined effect of heavy load and do not lose strength, creep and collapse. It requires a material having a relatively high temperature strength and high temperature hot strength, high load softening temperature, high creep resistance.

3. flame resistance and charge, feed dust erosion, impact and wear, surface loss. Require materials with a very high compactness and normal temperature, high temperature wear resistance.
4. resistance to high-temperature thermal load is applied, does not soften, not melted. Refractories requires a very high refractoriness.
5. resistance to sudden temperature changes or impact of uneven heating, no cracking, no peeling. Require materials with good thermal shock resistance.
6. resistance to molten metal, dust and gas chemical attack, not bad, not pitting. It requires a material having good slag resistance.
7. resistance to high-temperature thermal load is applied, the volume does not shrink and is just uniform expansion. Require materials with high volume stability, residual contraction and expansion remains to be small, no crystal transition and severe volume effect.
In addition, in order to ensure the overall quality of the refractory masonry block structure or a liner. Slag resistance and air tightness and ease of construction, also called material neat appearance, accurate size, to ensure a certain degree of tolerance, and do not allow to eliminate the defects. In order to withstand handling

The shock and mechanical vibration and squeeze may occur, requiring the material must have a relatively high temperature strength. For some special requirements of the Department, and sometimes also consider its thermal and electrical conductivity.
Second, economically justified: the selection of refractory materials, in addition to considering the technical requirements, but also need to pay attention refractory cost and supply issues. There are many refractories, although performance is good, but expensive, use is restricted. Usually easy to damage the furnace refractory material part

To high quality material, the material can be low, they do not noble material. Select the most suitable refractory material can reduce the damaging effects of high temperature flames and slag on the lining, but also regular maintenance furnace, timely repair work. In addition, reasonable thermal system, furnace temperature control, to avoid furnace

Temperature is too high hazard and shorten the life of the furnace;

It should be noted that although the above is described as the basis for evaluation of the quality of the refractory, but without any kind of refractory material able to fully meet all the above requirements. When selecting the evaluation or refractory, we must highlight the features and conditions of use of the material to adapt the best use

. While taking into account economic accounting.

As we engage in the production of refractories enterprises, but also includes an upstream raw materials and downstream producers of cement, glass, chemicals, metallurgy and other business users, refractory enterprises should take the initiative to strengthen cooperation with upstream and downstream enterprises and research institutions, and actively promote compliance with the actual production demand

The high cost of refractory application and promotion, give full play to the positive role of a benefit to users of refractories and related industries of energy conservation, energy.

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