refractory

Impurities on the performance of refractory material have a certain impact, so in the production process, we should try to ensure the purity of raw materials, especially mullite insulation brick. Impurities can affect the chemical properties, which may affect the life of the furnace.

First of all, FeO can penetrate the mullite solid solution, even if the little effect on the melting point of mullite, the glass phase will be dark, affecting the performance of mullite insulation brick.

Second, the excess alkali metal oxide can reduce the content of mullite, and even damage the crystallization of mullite, at the same time will have an impact on the glass phase, and affect the performance of mullite insulation brick.

Finally, CaO will slow down the crystallization process of mullite, although the impact is very small, but still need attention.

As a special product with special performance, magnesia brick in the market is naturally very popular, because in many places can be very perfect for the application, so naturally, the fame is relatively large, and all kinds of magnesia The advantage is that it can be developed in the market so good one of the powerful driving force, and now need this kind of product work area can be said to be very much.

According to professional data survey shows that now in our Chinese market, the need for magnesia brick work area is definitely the majority, a variety of electric furnace furnace bottom furnace wall, furnace bottom, and its furnace wall, as well as our glass kiln regenerator inside the lattice brick, are the need to use this product of magnesia brick, good fire resistance slag resistance of magnesia brick, and alkali performance, for these areas of work, are Indispensable, because the work of these work is just the need for these performance as the most basic support force.

And no matter what product, as long as this product, the scope of application in the market is more extensive, then this product in the market development prospects are relatively good, after all, between the two is a certain Relatively, and our magnesia bricks this product is naturally the same, magnesia bricks in the production of magnesium oxide content, the most basic need to reach the overall 90 percent, or even higher, the only way , in order to better guarantee that the performance of this product in all aspects.

Magnesia brick this product in the market development prospects can be said to be very good, and for this, I believe the market are legendary, and now the market can also be said that the magnesia brick product is more, the application is also very extensive, annual sales are very high, and believe that with the continuous development of the market, this product will certainly be able to develop better and better, really become a giant on the market.

Ceramic fiber blanket is a kind of insulating material made of ceramic fiber, mainly used in fire and insulation of the new products. As early as the late 1970s, ceramic fibers had appeared in China's industrial production, and because of its high temperature resistance is more prominent, only took less than a decade of time has been rapid development. At that time due to the technical limitations of the time, most of the ceramic fiber is mainly used for industrial production.

In recent years, with China's economic level and production technology significantly improved ceramic fiber production process has also been a significant improvement, coupled with the quality of life requirements are increasingly stringent, more and more manufacturers have begun to dissatisfied with At this stage of the insulation material insulation and insulation state, so the ceramic fiber blanket also came into being.

Because of its high temperature stability under the high temperature, ceramic fiber blanket can greatly reduce the high temperature equipment in the running process of self-weight and energy loss, and can shorten the entire operation time, thereby enhancing the efficiency of production, saving production costs, so a large number of Of the enterprises began to choose ceramic fiber blanket for adiabatic effect.

From 2010 onwards, environmental protection has become a hot topic. And many fiber products do not strictly enforce the state for the discharge of pollutants, combustion and emissions caused by environmental pollution has begun to become the focus of society, but as a new type of fiber product, ceramic fiber blanket in the beginning to focus on environmental protection Concept, and is on their own products to improve the process, and strive to achieve zero pollution targets, we can see that in the future fiber products market, ceramic fiber blanket will play a pivotal role.

The production process of fire clay brick mainly includes seven processes:

The first step: fire clay brick takes soil. The soil used for the burning of the brick is taken from the old soil of two feet deep under the surface. The color of the layer is slightly deeper than that of the surface soil. It is composed of about 80,000 to 120,000 years ago. At that time, the earth's climate warm and humid, rich biological effect of this period of the composition of the soil soft and sticky, is a good brick burning material.

The second step: excavated out of the clay, through up to six months or so in the open-air accumulation process, so that the sun shines, snow frost, so that the internal differentiation of the loose, and then through the craft damage, sieve, leaving only fine pure soil.

The third step: the pure water and moisturizing, and then repeat and refining, or cattle force trampling, making it a thick mud, manpower mud and refining to 5 to 6 times, the process of the final brick quality to critical effect.

The fourth step: turn to fill fire clay brick into the wooden brick in the mold, after compaction, with iron wire bow to scrap the remaining mud, and into a blank. Before the billet, in the wood mold under the ground sprinkle a layer of sand, to prevent mud and ground adhesion.

Step five: demoulding of the brick to be placed back to the sun dry, to prevent the exposure of the brick cracks and deformation.

Step six: After the billet is completely boring (about one to two months), then into the kiln firing, the process is the most important part of the whole brick making process, the usual brick use of coal as fuel, and the density of more High pulp bricks are wheat straw, pine and so gradually slow burning.

Step seven: After ten days of burning, the body has been sintered, such as when the time gradually turn off, the outside air into the kiln, the body after the cooling is flashing red, which is our common red brick, brick It is necessary to rust in the kiln, the way is in the high temperature sintering brick, with clay cover the kiln hole, cut air into the kiln temperature into the recovery atmosphere, so that the body of the red high-grade iron oxide In order to avoid the cheap iron in the body from the beginning to be oxidized, in the soil with the top of the kiln sealed with water, so that the water at high temperature into a vapor, absorb the heat inside the kiln, the kiln body in the This cooling process continues to maintain a recovery atmosphere until the kiln is completely cooled.

Mullite brick production methods are mainly two types: sintering synthesis of mullite brick and fused mullite brick. These two kinds of mullite brick production methods are not the same, the use of performance and quality are also very different, the following for everyone to introduce the mullite brick production process and performance:

1, sintered mullite brick production process

The production process of sintered mullite brick is the same as that of high alumina brick. It is mainly used to synthesize mullite clinker as pellets; and fine powder sometimes use synthetic mullite clinker, or by the white corundum, quartz powder and pure clay and other ingredients made with the British stone to the equivalent of Mixed powder. The pellets and fine powder in proportion with the commonly used ratio: pellets 45% to 55%, fine powder (<0.088mm) 55% to 45%. After homogeneous mixing, high pressure forming. Firing temperature of 1550 ~ l600 ℃. When the fumed synthetic mullite is used as the granular material, the firing temperature is greater than 1700 ℃, in which the purity of the raw material, the fineness of the raw material and the calcination temperature are the most important technological factors influencing the brick formation.

2, mullite brick performance

The nature of mullite brick is mainly determined by the nature of mullite. It has high refractoriness, high softening temperature, low creep rate, excellent heat shock resistance, slag resistance, high shear modulus and so on. Mullite refractory brick is widely used, mainly for high temperature hot air stove, large blast furnace hearth and bottom, steel furnace roof, ceramic industry furnace lining, kiln furniture, and glass kiln cement kiln lining.

The sintered mullite brick produced by sintering synthetic mullite as raw material has good resistance to erosion and impact resistance, and has achieved satisfactory application effect within a certain range.

The principle of fused mullite, sintered with the production of fused mullite brick is mainly used for glass kiln. The mechanical strength and load deformation temperature of this kind of brick is high, the density is large, the porosity is small, the content of the crystal phase is large, and there is no abnormal phenomenon on the thermal expansion curve. However, at high temperatures when such substances and a large number of alkali substances in contact, mullite unstable, easy to break down, which to some extent reduce the stability of such refractories. In addition, the final performance of fused mullite brick produced by fused mullite raw materials of different purity is different; even with the same chemical purity (eg, high purity) fused mullite, due to its different fusing process , The resulting refractory bricks are also different performance.

Mullite brick at 1450 ℃ above should not be in contact with alkaline substances, or mullite will break down. In more than 1370% of the reducing atmosphere, the mullite will also decompose, part of the SiO2 into the gaseous SiO2 leaves the brick body. When the temperature is higher than 1650 ° C, mullite is decomposed even at a lower oxygen partial pressure, even if it is not a reducing atmosphere. It can be seen that the combustion temperature directly affects the firing of mullite brick.

Ceramic fiber blanket is a fibrous light refractory material, with light weight, high temperature, good thermal stability, low thermal conductivity, heat and resistance to mechanical shock and other advantages. So what aspects is it applied? Its main uses are as follows:

1. A variety of insulated industrial furnace door seal, mouth curtain.

2. High temperature flue, duct bushings, inflatable joints.

3. Petrochemical equipment, containers, pipes, high temperature insulation, insulation.

4. Ceramic fiber blanket can be used for high temperature environment protective clothing, gloves, headgear, helmets, boots and so on.

5. The car engine heat shield, heavy oil engine exhaust pipe package, high-speed car's composite brake friction pad.

6. The transport of high temperature liquid, gas pump, compressor and valve with the sealing filler, gasket.

7. High temperature electrical insulation.

8. Fire doors, fire curtains, fire blankets, then with spark and insulation cover, such as fire stitch products.

9. Ceramic fiber blanket can also be used for aerospace, aviation industry with the insulation, insulation materials, brake friction pad.

10. Deep cold equipment, containers, pipe insulation, parcels.

11. High-grade office in the archives, vaults, safes and other important places of adiabatic, fire barrier, fire automatic fire curtain.

The specific features of mullite insulation brick:

1. Lightweight insulation brick foam with foam can be obtained bubble bubble uniform.

2. The foam is independent, easy to form a communication hole, prepared by the foam of the closed cell rate is high, which has a good insulation and waterproof effect.

3. Lightweight insulation brick for the preparation of dry density of three hundred to twelve kilograms per cubic meter of foam concrete, the amount of foam, technical and economic benefits.

4. Light insulation brick and cement adaptability.

5. Green, non-toxic, non-corrosive, safe use.

6. Light insulation brick low price, can greatly reduce costs.

7. Excellent foaming performance, the expansion ratio of up to three times.