Experts explain you the defects of production of clay brick

Many long-term use of brick friends all know that clay is the oldest and most widely used refractories, enrich its raw materials, processing is simple, inexpensive, however, from an environmental perspective fired clay to consume large amounts of arable land , which for a large population, 80% of farmers’ agricultural country concerned, is not in line with national policy. Environmental damage large, due to the clay soil excavated mainly by sintering, and therefore damage to soil and vegetation damage, resulting in soil erosion, bad environment was severely damaged, so the country is gradually stop the project using clay.

There are other disadvantages clay, such as: ① poor sound insulation, sound propagation to the clay due to its porosity is small, there is no isolation of the sound, the sound decibel reduction is small, and other masonry materials such as are used more aerated concrete block its porosity greater sound insulation effect is obvious; ② self-important, the weight of clay brick masonry wall material weight than other relatively large, making the structure needs to withstand greater weight, construction cost increases.

If clay to use as drywall, then do not sickness, it is easy to weathering, affect the appearance. So now there are many alternatives to brick, shale brick, concrete hollow blocks, clay hollow blocks, porous shale bricks, porous bricks and so on.

Refractory castable flowability

We know that there is refractoriness refractory castable, but what is its fluidity is it? This point will we do not know, because a lot of people for refractory castable fluidity is not particularly understand, so today let technicians Changxing new secret to tell you: the flow of knowledge refractory castable degree.

We all know that is not the same refractory castable construction, but only that they have the same fluidity, but there will be different refractory castable performance problems at the same fluidity of the situation, and these are associated with castable construction method, temperature and material used so inseparable bond, so it proved castable has a certain fluidity. But how do we find the fluidity of refractory castable and its determination it? Then we need to use the fluidity of the measurement equipment, and is a 760mm diameter table of jump. The trial of a high 127mm, catchy diameter 171mm, 254mm outlet diameter truncated cones placed in the center jump table, mixing the two layers tamping castable placed the barrel, then remove the cone to a beat rate of 15 times per second, so that the desktop castable expansion amount of the expanded diameter D (mm). The formula to calculate the degree of liquidity is: F1: F1 = (D-254) / 254 * 100%. After these processes is measured out refractory castable degree of liquidity.

Comprehensive above described, the fluidity of refractory castable what knowledge you have some understanding of it, if you want to consult more knowledge about refractory castable can consult us.

Reasons for firebrick heat burst phenomenon

The reason for firebrick heat burst phenomenon. Do you know the reasons for the phenomenon of heat burst firebrick emerge? Below I explain for your detailed introduction about it:

1, magnesia or magnesia-chrome brick, due to the large thermal expansion coefficient, while also prone to sudden changes in temperature firebrick heat burst.

2, the mineral phase constituted of silica brick, such as quartz, tridymite, cristobalite, due to the temperature change is accompanied by crystal transformation of quartz, along with the volume of mutation, so the heating or cooling brick masonry structure, special Note heat burst problem.

3, insulating firebrick, because of its low thermal conductivity, a large temperature gradient of the brick body, and because of its relatively low intensity, so it is easy to generate heat burst problem.

The above is a brief burst phenomenon firebrick heat reason, I hope for your help, more product information, please feel free to contact us or login inhttp://www.yilongrefractory.com.

Introduction of refractory HCS

The compressive strength of the high temperature refractory material (hot crushing strength, abbreviated HCS) is the maximum pressure of the material at a high temperature higher than 1000-1200 ℃ hot state per unit area can withstand (in units of MPa). Refractory compressive strength generally increases with the increase of temperature changes significantly. With increasing temperature from the room temperature, the intensity decreased linearly. Since then, some materials still continue to decline with increasing temperature; some material when the temperature rises within a certain range, with increasing temperature, and reaches a maximum in accounts under a certain temperature, followed by a sharp decline.

Changes in the compressive strength of high temperature refractory products by certain components of the material, in particular wherein the matrix or binding phase change occurs at a high temperature is controlled. Generally, the crystal is completely composed of sintered refractory material, and due to the high temperature grain boundaries wherein the grains are prone to plastic deformation, especially when its loading rate is small are more likely to plastically deform, so the strength increases with increasing temperature andreduced. Some of the crystal when the melt or at an elevated temperature to form a molten body, such as brick, alumina bricks, and clay, the matrix phase mainly composed of glass, as the temperature increases, the strength of the multiphase material of this was also due microstructure changes with temperature decrease.

When the temperature is further increased, since the viscosity of the glass phase becomes brittle toughness, so that binding between the material particles are more strongly, so that the strength is remarkably improved. Then, as the temperature increases, the melt viscosity of the material due to a sharp decline in the strength of the material also will be a sharp decline.

Refractories for coke oven

Coke oven furnace body structure is what? The use of refractory materials is how? According to the Xinmi Changxing refractories experts, coke oven is thermal equipment dry distillation of coal coke and chemical products, mainly by the carbonization chamber, combustion chamber, top, chute, the regenerator and the small flue etc.. As each part of the main use of refractory material:

(1) Refractory material for carbonization chamber. The carbonization chamber work is periodic, coal furnace wall surface temperature dropped to around 600’C, the end of coking furnace wall surface temperature rose to 1000 to 1100 DEG C. Therefore, the carbonization chamber wall, bottom brick masonry. Furnace head of carbonization chamber at both ends of the opening of the door, because when the temperature suddenly changes, reduced from 10 00’C to 500 DEG C, exceed the temperature limit brick volume stability (573 C), so the furnace head should choose good thermal shock resistance products, most previous selection of clay brick, now tend to use high-quality high aluminum bricks, in selection of sillimanite brick and red brick masonry.

(2) Refractory material for combustion chamber. The combustion chamber and the carbonization chamber shared furnace wall, the bricks with the same carbonization chamber.

(3) Refractories for hot blast furnace. Around the top coal charging hole due to temperature fluctuations, clay brick masonry, other parts of silica bricks masonry.

(4) For refractory material chute. Chute of the combustion chamber is connected with the regenerator, requirements of brick body structure stability, resistance to the action of thermal stress. With the clay brick and small coke oven, large and medium coke using silica brick masonry.

(5) The regenerator refractories. Small coke oven regenerator single wall, partition wall, bottom and checker brick masonry are used for clay brick masonry, storage of large and medium-sized coke oven chamber, the upper masonry all using silica brick masonry, in order to make the whole to the uniform expansion of coke oven.

(6) Refractory material for the small flue. Small flue is located in the bottom of the regenerative chamber communicated with a flue. Small flue with all the clay brick lining.

In general, coke oven refractory materials are mainly siliceous refractory brick. Coke oven silica brick requires accurate size, and have a high enough volume density, thermal conductivity, high temperature creep resistance and high temperature strength of brick; phase composition to tridymite, residual quartz that less is more.