The Performance of Chrome Corundum Brick

The performance of chrome corundum brick.

Fire resistance of the products

Add Cr2O3 to high purity corundum material, no matter how much the amount is, not only will not reduce refractory performance of materials, on the contrary make fireproof performance of materials improved. The refractoriness of chrome corundum brick (> 1790!) and refractoriness under load (> 1700!) are superior to high purity corundum products.

1. The strength of the products

 Room temperature compressive strength of high purity corundum brick is 70 ~ 100 MPa commonly, room temperature compressive strength of high performance chromecorundum brick is generally more than 150 MPa, the intensity is significantly higher than the corundum brick. This is because the products in the process of burning, between particles and particles, particles and fine powder, powder and powder, formed  Al2O3 - Cr2O3 solid solution, the solid solution connects particles to fine powder particles together, make the strength of the material is greatly increased.

2. Thermal shock resistance

Add Cr2O3 to corundum, when Cr2O3 content is 10% ~ 66%. The raw materials that Chrome corundum series of products used is made from alumina and chromium oxide according to certain proportion matching, after high temperature melting synthesis of a solid solution. Using special refractory materials production technology to produce refractory brick, can improve and enhance internal quality of the products, improve the high temperature performance of products, have the characteristics of high refractoriness, big strength, good thermal shock stability, strong ability to resist erosion, in use, scour resistance, wear resistance, erosion resistance, spalling structure resistance, have obtained the good effect in metallurgy, glass, carbon black, the petrochemical industry.

What Installation Steps Does Ceramic fiber module have ?

The installation steps of ceramic fiber module:

1. Scrap rust: before construction, steel structure party need scrap rust to the furnace wall copper plate, in order to meet the welding requirements.
2. Wiring: according to the design drawings as shown in the ceramic fiber module arrangement, pay off on the wall board, mark the welding points of anchor bolt arrangement.
3. Welding bolts: according to the design, welding the corresponding length of bolt on the furnace wall board according to the requirements of welding, when welding, should take protective measures to the bolt thread part, shall not  splash down welding slag to the part of the bolt screw thread, and ensure the welding quality.
4. Smear high-temperature and anticorrosive coating layer: according to the provisions of the design drawings, on the wall plates and bolts’ root evenly welds high temperature anticorrosive coating layer, the coating thickness according to 3 kg/m2. When brushing, should take the protection measures to bolt thread part, must not splash down coating to the part of the bolt screw thread.
5. Tile carpet installation: laid the first layer of fiber blanket, and then laid the second fiber blanket, a stagger volume of joints should be no less than 100 mm. For the convenience of construction, furnace roof tile need make rapid card to make temporary fixed.
6. The installation of module
7. The installation of compensate carpet
8. Lining repair: finish the whole lining installed, from top to bottom for renovation.

What Are The advantages of Fire Clay Brick ?

Fire Clay brick is used in construction of artificial small piece of material, is one of the world’s oldest building materials. With clay (such as shale, coal gangue powder) as the main raw material, pass through sludge processing, molding, drying and roasting completed. The main raw material of fire clay brick is nature or sandy clay, its main chemical composition is SiO2, Al2O3, Fe2O3 and crystallization water, because of the different geological formation conditions, may also contain a small amount of alkali metal and alkaline earth metal oxides. The production technology of fire clay brick mainly includes soil, mud, blocking, drying, roasting, etc.

The advantages of fire clay brick:

1. Fire clay brick shows weak acid under high temperature, alkaline slag erosion resistance is a bit poor, but enhanced with Al2O3 content increase, and the thermal stability than silica brick, magnesia brick as well.
2. The blast furnace fire clay brick of quality qualification goes through drying treatment, vacuum impregnation phosphate, secondary low temperature firing of phosphate impregnation products, can be used for laying on blast furnace lining.
3. Fire clay brick use local materials, cheap price, durable, and fire prevention, heat insulation, sound insulation and absorption of moisture, widely used in civil instruction engineering, waste brick bat also can make concrete aggregate.
4. Fly ash fire clay brick with fly ash as main raw material, mixed with coal gangue powder or clay and cementation material, going through the ingredients, molding, drying and calcination completed, can make full use of industrial waste residue, save fuel.

What requirements should Refractory Materials meet?

Refractory materials used for all kinds of high temperature equipment, it is the high temperature condition of the physical and chemical erosion and mechanical damage, so the performance of refractory materials shall meet the following requirements:

1. High refractoriness. Modern metallurgical furnace and other industrial kiln‘s heating temperature are generally between 1000 ~ 1800 ℃. Refractory material should have no easy to melt performance under the action of high temperature.
2. High temperature structural strength is large. Refractory materials should not only have high melting temperature, but also should not happen softening deformation and collapse under the stove masonry load or other mechanical shock.
3. Thermal stability is good. Metallurgical furnace and other industrial kiln are in operation, due to temperature shock caused by uneven temperature of each part of refractory material, masonry internal stress and make the material fissile and peeling. Therefore, refractory materials should have the ability to resist the damage.
4. Slag resistance ability is strong. Refractory material in use process, often by high temperature furnace slag, metal and chemical erosion of furnace dust. Therefore, must have the ability to resist erosion of refractory material.
5. High temperature volume is stable. Refractory materials at high temperature for a long time use, bricky system internal can produce volume shrinkage or expansion, causes the damage of refractory masonry.

The energy saving effect of ceramic fiber blanket

Ceramic Fiber Blanket is the clay clinker of high purity, alumina powder, silica powder and other raw materials melting in high temperature furnace, forming fluid. Fiber cotton can be further processed into fiber blanket, board, paper, cloth, rope and other products. Turn out to be an efficient heat insulation material, with the characteristics of light weight, high strength, oxidation resistance, low thermal conductivity, good flexibility, corrosion resistant, small heat capacity and sound insulation, etc.

Ceramic fiber blanket made from ceramic fiber as the raw material, in recent years become each big kiln dedicated furnace lining materials, because of its simplicity and easy construction, and heat insulation effect is better, become a required insulation material of kiln company. The adiabatic temperature can reach more than 1600 degrees, greatly satisfy the needs of the user.

Energy shortage, various cost increase, are the necessity of  industrialization process, has the construction application of the energy-saving insulation materials, for the enterprise, it is the top priority in development, ceramic fiber blanket improves the conservation of thermal efficiency, but for some special kilns, due to the particularity of chemicals, may temporarily can’t use ceramic fiber blanket as insulation materials, Therefore, the development and application of ceramic fiber blanket was further improved

The Use Nature of Refractory Materials

In use process of refractory material,  due to a variety of differences of environment, a variety of requirements are proposed on the performance of products, whether to meet the requirements of performance indicators, become the main measure standard of the quality of refractory products, and also prolong its service life, improve the important basis of use value.

Refractoriness

Refractoriness is refractory material resist to high temperature function rather than melting performance, its meaning of refractoriness and melting point are different, melting point is refers to the crystalline phase and liquid phase of pure substance is in equilibrium temperature. And general refractory material is multiphase solid mixture composed of a variety of mineral, has no uniform melting point, but began to produce liquid phase under certain temperature, with temperature rising, the liquid phase ratio increases continuously, to a fixed temperature, solid phase can all melt for the liquid phase. Between the two fixed temperature range, both liquid phase and solid phase exist at the same time.

The chemical composition, mineral composition and its distribution of refractory products are the most basic factors to influence the refractoriness. Impurity elements with strong solvent effect, will seriously reduce the refractoriness of products. Uneven distribution of composition that cannot form an ideal high melting point mineral, will lead to lower refractoriness products, so damage the using performance of products, but the refractoriness of products doesn’t mean its use temperature, because refractory material in use, processes through high temperature function at the same time, often with the solvent effect of load and external things and so on. Actually allowable working temperature is much lower than refractoriness, but, after all, the refractoriness index is one of the important reference frame to select reasonably refractory material.

Refractoriness under load

The refractoriness under load of refractory material, also known as the high temperature load deformation temperature, defined as refractory products under persistent overheating conditions, bear deformation temperature under constant load. It said the refractory products at the same time resist the ability of high temperature and load effect.

Linear change on reheating

Linear change on reheating, also known as residual linear change, refers to after the refractory material heated to high temperature, happens the irreversible changes of its length. The specific definition is refractory products sample heated to the specified temperature, heat preservation time, after cooling to room temperature, the length produce residual expansion or contraction.

Thermal shock resistance

Refractory material in use process, the environment temperature change is inevitable.

The production process of Fused Cast AZS Block

Fused Cast AZS Block concrete production process is as follows:

1. Formulated fused zirconium corundum material

The excellent performance of high purity fused zirconium corundum material, weighing mixed together, make the performance of the raw materials are fully used. material, weighing mixed together, make the performance of the raw materials are fully used.

2. melting fused zirconium corundum

Will cooperate with fused zircon corundum material add to the automatic control of electric arc furnace, melting at the best possible conditions. With single phase or three phase arc furnace molten melt temperature should be moderate, the batch of low temperature will not be made highly uniform melt, are apt to form porous body castings, make the  fused cast products pores and cracks, contract also increases accordingly, make the products form a larger shrinkage cavity.

3. Pouring

The molten material specially designed injection mold products. Fused cast made dense structure and use of the good performance of fused brick. With appropriate hot melt casting, casting out of the shrinkage cavity concentration of zirconium corundum brick, the dense zone thickness increases, the density of the products also increased. But when overheating degree is high, although the melt density is increased, but the products forming cracks and large shrinkage.

4. Annealing

After casting a good brick and to slow cooling, make  zirconium corundum block made of crystal growth and form the best structure.

5. The surface processing

Using precision machining equipment to make products fused cast AZS block processing into comply with the design requirements of accurate size. Mechanical processing can improve the quality of fused brick and prolong its service life.

6. Inspection

Each piece of fused cast AZS block is strict visual inspection shall be carried out in accordance with the contract standard.

7. The physical and chemical analysis

Control project to the requirement of the contract, the physical and chemical analysis was carried out on the fused brick.

The Advantages of Chrome Corundum Brick

Chrome corundum brick is alumina – chrome oxide as the main raw material production of high-performance, has the characteristics of high refractoriness, great strength, good thermal shock stability, strong ability to resist erosion, in use, has the performances of scouring resistance, wear resistance, resistance to spalling structure, has obtained the good effect in metallurgy, glass, carbon black, the petrochemical industry. Chrome corundum brick using raw material is by the ratio of alumina and chromium oxide according to certain proportion, go through high temperature melting synthesis of a solid solution.  Use special refractory materials production technology to make refractory brick, can improve and enhance internal quality of the products, improve the high temperature performance of products.

1. Refractory properties of chrome corundum brick

Add Cr2O3 to high purity corundum material, no matter how much the amount is, not only will not reduce the fire performance of materials, instead, can make fire performance of the material fire performance improved.

2. The strength of chrome corundum brick

The room temperature compressive strength of high purity corundum brick is 70 ~ 100 MPa commonly, the room temperature compressive strength of high performance chrome corundum brick  is generally  larger 150 MPa, the intensity is significantly higher than the corundum brick.This is because the products in the process of burning, between particles and fines powder, fines powder and fines powder formed Al2O3 – Cr2O3 solid solution, calcium solid solution connect particles to fines powder together, make the strength of the material greatly increased.

3. Thermal shock resistance

Add Cr2O3 to corundum, when the content of Cr2O3 is 10% ~ 66%, the thermal shock resistance of material decreased with increasing content of Cr2O3, namely the low content of Cr2O3 of chrome corundum brick, the thermal shock stability is better than Cr2O3 high content of chrome corundum brick. The Cr2O3 content of high-performance chrome corundum brick is around 12% ~ 20%, improve more stability than the corundum brick.

4. Slag erosion resistance ability

Cr2O3 or containing Cr2O3 of refractory material has the good resistance to slag, non-ferrous metallurgical slag, coal gasification furnace, oil gas furnace slag and all kinds of glass melt dissolution ability. Cr2O3 melt or Cr2O3 reaction with slag generated liquid viscosity is larger than other low melt viscosity, prevents slag brick along the capillary pores to permeate inside

What are the unique advantages of Sillimanite Brick?

Sillimanite brick is refractory brick made of sillimanite minerals. Commonly using high temperature burning method and mud casting method to product.

Sillimanite brick has five big advantage of using:

1. The application of non-ferrous metal smelting industry

Use silicon carbid, high temperature resistance, big strength, good heat conduction performance, impact resistance, high-temperature indirect heating material, such as strong retort furnace. Distillation furnace tray, aluminium electrolyzer, copper melting furnace lining, furnace zinc powder with arc plate, the thermocouple protection tube, etc.

2. The application of iron and steel industry

The use of silicon carbide corrosion resistance. Thermal shock resistance to wear and tear. Good characteristics of thermal conductivity, for large blast furnace lining to improve the service life.

3. The application of metallurgical mineral processing industry

Silicon carbide hardness is second only to diamond, strong wear resistance, is wear-resisting pipe, the impeller, pump room, cyclone, ore bucket lined with ideal material, its wear resistance is  5 to 20 times than the service life of cast iron,rubber,  is one of the aviation flight track ideal material.

4. The application of building materials ceramic, grinding wheel industry

Using the coefficient of thermal conductivity.The characteristics of thermal radiation, high strength, manufacturing sheet kiln furniture, not only can reduce the capacity of kiln furniture, also improves the loading capacity of the kiln and the product quality, shorten the production cycle, is the ideal indirect materials of ceramic glaze baking sintering.

5. The application of energy saving

With good thermal conductivity and thermal stability, heat exchanger, burnup decreased by 20%, saving fuel by 35%