Matters should be noticed in refractory brick sintering process

Refractory brick is a kind of high temperature resistance, refractoriness very high brick material, in industrial furnace refractory brick is very broad scope of application. Refractory brick sintering is carried out in the high temperature, today we have to know what should pay attention to the sintering process of refractory bricks in question!

1.         Reduce the granularity of material. In general, the raw material is fine, the greater area, surface energy is higher, the powder surface and internal defects would occur more. Powder with high activity, increasing the sintering driving force, shorten the atomic diffusion distance, improve the solubility of particles in liquid phase.

2.         Activated sintering and two step sintering. Activated sintering is by increasing the activity of the raw materials and to make it easy for sintering. To reduce the particle size of raw materials is also a kind of living. But rely on mechanical method to reduce the size of raw material is limited, and the energy consumption is greatly increased. Using chemical method can also improve the material activity, such as the widely used in alkaline refractory raw materials in the two step calcination method, namely light burning, pressure ball (blank) - dead burned, is very effective.

3.         Additives to promote sintering in a wide range of sintering of refractory bricks of raw materials in the present. In the solid phase sintering, a small amount of additives can form solid solution and sintering of health, promote and accelerate the sintering defects increase; in the sintering of a liquid phase in the nature, additive can improve the liquid phase sintering and promote.

After we introduce today is the basic knowledge about firebrick sintering process, we believe that on refractory brick sintering have a comprehensive understanding of it, if you want to know more about the knowledge of refractory brick contact us!

Used for blast furnace lining in castable refractory material. It is a kind of containing silicon carbide and carbon of high alumina castable. Trough the castable lining was developed in the late twentieth Century 70 a new unshaped refractory materials, with the iron quantity, long service life, low consumption of refractory material, convenient construction etc...

Trough castables is mainly composed of high alumina, silicon carbide, carbonmaterials and binder prepared.

High alumina raw materials: the use of electric melting or sintering corundum spinel, bauxite clinker in one or two.

Silicon carbide materials: can choose one grade or two grade black silicon carbide.

Carbonaceous materials: the use of asphalt, coke, graphite or electrode powdered..

Binder: the clay, good dispersion of oxides or ultrafine powder and pure calcium aluminate cement.

Technical features: iron trough castable trench lining in repair without dismantling old lining, in the clear old lining surface residue and residual iron can be carried out after repair of casting, the old and the new ditch lining has good binding capacity, compared with the ramming material, waste is reduced by more than 50%, after repeated feeding, the total amount of iron. Up to 30 ~ 1000000t

Prospects of refractory castable products

Refractory castable as a very practical refractory material, it is very important in the status of the industry, at the same time, in our country also cannot lack the existence of this product, and now with the development of our country more and more quickly, need of castable refractory industry is also growing, so that the production of domestic enterprises have been constantly emerging.

So from this we should be able to predict, in the future this kind of refractory products in the market is affected by many users and consumers and other industry's attention, but also bring great use for the development of our country.

Nowadays with the rapid development of refractory castable, many new species are also in the constant increase, but this does not mean that the quality of the products is not guaranteed, but with the increase in varieties, the quality of the products also increased, many more new refractory raw materials have also been developed. My company is a very advanced technology enterprises, and many years of production experience, is worthy of the trust of the people, but also very quality assurance. If people want to have the quality and safety assurance of castable refractory products, welcome to our company for purchase.

Now that the castable refractories market so well, so my company in the market prospects will be very broad, when people focus on the industry and the products of the enterprise, we will let consumers with special respect.

How to shorten the unshaped refractory construction time

We know that usually heat treatment equipment (furnace) maintenance time is long, the entire construction time ordinary unshaped refractory takes a long time, which greatly affect the normal production of the enterprise, reduce the production efficiency. In order to solve this problem, Luoyang Yilong Refractories Co.,Ltd think of the following methods:

1.     We can add the composite explosion-proof agent of high explosion-proof performance;

2.     Add the compound water reducing agent to improve the operating performance, the main purpose is to reduce the amount of water, so that the material containing low content, decrease the burst risk in the process of drying;

3.    Using phosphate as binder, the curing time is faster than the cement, rapid hardening to achieve.

Through the above ways to resolve the construction time of heating furnace, the castable short construction time, baking temperature quickly, long service life, release time of only about 4h, and the drying time is shortened to 1-2 days, and conventional castables for 5-7 days compared to oven baking time, saving more than 3 days, can win the valuable production time enterprise.

High quality refractory castable can be used for furnace construction

Refractory castable is different from the refractory brick products, but the relationship between the two is very close, they are in many cases the common existence, also for some application industry is also very important products. Our country is the world export refractory products in most countries, but some countries sometimes from our domestic imports of some refractory castable, used in the production and processing of their national enterprises. Then the refractory castable in our country is mainly used in what industry or what the building?

This is what we say today's topic, some good quality, safe in refractory castable products can be used for the kiln and kiln construction, role, everyone is aware of the importance of our country, it is not the lack of. General a furnace life of approximately 5 to 10 years, some even up to 20 years, which is mainly composed of determine what? It is the quality of refractory castable. Only the quality of refractory castable is very high, and through the production process produced very strict, or more formal manufacturers, has many years of experience in production and operation, so it is worthy of widely accepted, at the same time for the kiln built, also has the very long life.

Kiln always have to face the environmental temperature, and the general material products can not do have a long life, but refractory castable is different, its appearance is to stand the test of time and temperature.

The vulnerable influence of refractory castable in construction

1.    The construction of pouring space is small, the construction personnel usually add more water in the mixing, so that you can make the refractory castable has good mobility, but also increase the refractory lining hole body,

reduces the compactness of the lining of the body, and its strength is reduced: the same, lining of the body vibration imperfect, will shorten the service life of refractory castable.

2.     Lining thickness, pouring a small space, many staple clouds between the die and the burner, pouring and vibrating, vibration bar operation very difficult, operation not skilled or not serious, refractory castable is vibrating imperfect.

3.     After pouring, without adequate maintenance, as the lining of the body low early strength, loose structure, often too late to sintering have damaged; the lining body warms up abruptly, sometimes burst.

4.     Winter construction, the ambient temperature is low the binder (hydration) hydration of incomplete or water, or pouring body cold, would seriously reduce the refractory castable strength or destroy its structure, and affecting the use effect.

Solutions to refractory brick shedding used in boiler

Because the boiler pouring material and refractory material damage loss, seriously affect the safe operation of the unit, and even cause non stop accident unit.

In order to ensure the long-term safe operation of the boiler, take the following measures from the operation of the adjustment

• Ignition methods.

1. The ignition temperature process, control the bed temperature and the outlet of the furnace, cyclone separator leg temperature change rate of not more than 80 ℃ / h.
2. By adjusting the fuel door or throttle back to change the oil amount, strengthen with the wind, to maintain the best air fuel ratio, temperature less than 700 ℃ burner piping.
3.  Maintain a volume greater than the minimum fluidizing air flow rate, gas temperature rise faster, by increasing the rise velocity of two air control flue temperature does not exceed the specified value.
4. Bed temperature at 330 ～ 350 ℃ with coal feeding conditions using dynamic way to coal, while adding one or two times volume control the bed temperature and gas temperature from rising too fast, strict monitoring, control the bed temperature and gas temperature change, and the change trend of monitoring oxygen master advanced quantity control the quantity of coal. When the cyclone separator population temperature changes smoothly, gradually changed to continuous coal, used to add less, more in the way of increasing coal, so as to control the bed temperature of furnace outlet flue gas temperature and avoid large fluctuations, reduced the refractories shedding

•    Furnace measures

1. Boiler shutdown process, control the bed temperature, strict furnace exit flue gas temperature drop speed of not more than 80 ℃ / h.
   
2. Slide stop, bed temperature and steam temperature, steam synchronization downhill, by adding one or two times volume decreased bed temperature, to avoid the high bed temperature shutdown period. When the bed temperature below 550 ℃ and the decreasing speed stop to the coal will be a volume is reduced to the minimum fluidizing air flow rate, the two volume is reduced to the minimum, avoid bed temperature drops too fast.
3. Boiler flameout, bed temperature should stop one or two wind turbines operating in more than 400 ℃, prevent the abrupt cooling, fan ventilation and stop running.
4. Fan stops running 4h, bed temperature below 400 ℃ can start fan cooling.

In the boiler start stop, peak shaving, machine breakdown and unit load rejection, strict control of smoke temperature change rate, thus pouring material and refractory protection is not damaged