Three common kinds of refractory castable

Refractory castable is monolithic refractories that widely produced and used currently. Mainly used for the construction of various heating furnace lining and so on overall structures. Some high quality varieties can also be used for smelting furnace.

Such as aluminates cement castable can be widely used for various heating furnace and other no residue, no corrosion of thermal equipment, and is the main varieties of refractory castable unshaped refractory materials, according to the different of the cementing material, curing and molding mechanism can be divided into three that hydraulic, air hardening and fire hard.

1. Hydraulic refractory castable: Using cement as the cementing material pouring in the hardening process require water to take part in a chemical reaction, forming a gel hardening strength, are hydraulic refractory castable. Cement is to determine the strength of castable (especially the atmospheric temperature strength) of the main factors, but its refractory degree is relatively low, so in that room temperature strength necessary, should as far as possible to reduce the amount of cement. If in order to compactness and construction workability, can be appropriate to increase the refractory powder. Reduce the amount of cement is also one of the measures to reduce the cost of. The construction should be strictly prevent aluminate cement and Portland cement, lime mixture. Because these two kinds of different chemical composition of the mixture will produce water aluminum acid calcium three, which greatly reduced strength.
   
2. Air hardening castable: Refers to the cementing agent in the maintenance of the absorption of CO2 in the air gradually solidified hardening. Refractory castable is the most commonly used water glass refractory concrete. Water glass refractory castable besides the performance of high-temperature resistance, it is acid resistant, abrasion performance, so often used as chemical equipment lining. Water glass, refractory castable process hardening under natural conditions is very slow, need to add coagulant in the construction (sodium fluorosilicate, high alumina cement).
3. Fire refractory castable: Using phosphoric acid and phosphate castable binder, need to pass through the heating and baking to obtain the strength and high temperature performance, so that the fire refractory castable.

Cannot insensible knowledge of refractory brick

Refractory brick can be referred to as fire brick, it has a certain shape and size, according to the different raw materials, refractory brick also has several different colors,

but most of them are the production of rectangular, and is in accordance with the different production process which can produce different kinds of brick. And refractory brick is divided into two kinds, one kind is the refractory materials and another is unshaped refractory material, since it is a refractory brick two different positive production process and the production of raw materials also each are not identical, refractories stereotypes are standard rules, can also be transformed according to the situation, and unshaped refractory materials is more regular production and become, have very strong liquidity.

Although there are several different refractory brick production and raw material but the results and effects are the same, it can withstand the high temperature combustion, also wear other than brick,

but of course its service life is long. But if you in the purchase of refractory brick, is to buy in the informal manufacturers then may buy refractory brick quality bad, not only short service life and refractoriness is not good, basic and common brick not what difference. Because the quality of the use of all those factory difference, low cost of refractory raw material for the production of refractory brick, the purpose is to use the low production costs to earn higher profits.

So people must not be cheated by them, only the regular factory will be good, reliable quality refractory raw materials to produce bricks can be used for a long time, refractoriness is strongest, but the regular factory and security, need not worry about customer service, these firebrick knowledge must remember.

Refractory industry will develop to green

In the development of our domestic industry, basically can achieve energy-saving environmental protection industry is not a lot, but refractory industry today we say it is belongs to the field of energy development.

In this industry, refractory materials, various types of products  , such as refractory brick, refractory castable etc. products, however, these two products are able to do energy-saving green development. Now with the major industry continue to emerge,  the state pay more attention to the refractory material production, and the development trend is apparent.

In fact, for the resources of our country market, we must also understand some of it, like oil, coal and other natural resources are declining, and the state is always in search for new products to replace the natural resources, but not too ideal. But in the domestic resources are becoming scarce today, appear energy-saving environmental protection refractory material model,

let this situation has improved, the state has approved the development of this industry. Because the development of this industry can promote the sustainable development of the country, and to other industry has brought a lot of use.

For the development of refractory products green, low carbon, our country has not given up, and to make great improvement, the development strategy in the global green economy, only the development of refractory industry of our country mainly, to comprehensive economic in China has greatly improved, and perhaps one day as a big refractory materials can also be the global market.

Difference between refractory brick and insulation brick

Effect of heat insulation brick is used to heat preservation, reduce heat loss, refractory brick is mainly used to withstand flame burn. Insulating brick is generally not direct contact with the flame, and refractory brick general direct contact with the flame.

The main difference between the following points:

• Insulation performance

Thermal conductivity of thermal insulation brick in general 0.2-0.4 (average temperature 350 ± 25 ℃) w/m.k, and refractory brick of heat conduction coefficient in 1 (the average temperature 350 ± 25 ℃) than w/m.k, which can obtain insulating brick insulation performance than the refractory brick insulation performance is much better.

• Refractoriness

Insulating brick refractoriness generally below 1400 degrees, and refractory refractory degree is above 1400 degrees.

• Density

Insulating brick is generally a lightweight thermal insulation material, density in 0.8-1.0g/cm3 and refractory brick of basic density is above 2.0g/cm3.

To make a long story short insulating brick is generally emphasized the insulation performance of it, does not pay attention to its refractoriness fire brick, and on the contrary. Different locations will use different materials, in the purchase of materials at the same time, to choose their own use.

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.