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There are many kinds of aluminum lightweight heat insulation bricks. Hongtai resistance materials introduce you to lightweight high aluminum bricks and alumina hollow ball bricks.These two products have excellent thermal insulation performance and are applied to various thermal equipment to reduce heat loss and improve production efficiency.
Lightweight high-alumina brick is also called high-alumina insulation brick with alumina content of more than 48%.Volume density: 0.4-1.35 g/cm3.The porosity is 66% ~ 73%, and the compressive strength is 1 ~ 8MPa.Good thermal shock resistance.Usually use high bauxite clinker and a small amount of clay, the fine grinding method or bubble method using gas before and after the pouring and forming in the form of mud, burn into the 1300 ~ 1500 ℃.Sometimes industrial alumina can be used instead of some alumina clinker.Used for lining and insulating layer of kiln furnace, as well as parts without strong high temperature melting material erosion and scour.Direct contact with the flame, the contact surface temperature is not higher than 1350 ℃.
Alumina hollow ball is a new kind of high temperature heat insulation material, which is made by smelting and blowing of industrial alumina in electric furnace.In alumina hollow ball as the main body, can be made into various shapes, the highest temperature 1800 ℃, high mechanical strength, general light products several times, and the bulk density is only half of the corundum products.It has been widely used in high temperature and ultra-high temperature kilns such as petrochemical gasifier, carbon black industrial reaction furnace and induction furnace in metallurgical industry.
The inner part of the lightweight thermal insulation firebrick system is a fixed block heat insulation firebrick with thermal insulation property of porous structure.Lightweight thermal insulation firebricks are usually classified and named according to their materials or materials used in manufacturing.For example, light refractory bricks made from clay, silica and high aluminum are respectively called light clay bricks, light silica bricks and light high aluminum bricks.The following lists the types and characteristics of lightweight thermal insulation firebrick by the materials and ingredients used in the manufacture of lightweight firebrick.
What is a lightweight high alumina brick?
Lightweight high alumina bricks are also known as high alumina insulation bricks. A lightweight refractory material having an alumina content of more than 48%, mainly composed of mullite and a glass phase or corundum. The bulk density is 0.4 to 1.35 g/cm3. The porosity is 66% to 73%, and the pressure resistance is 1 to 8 MPa. Good thermal shock resistance.
Usually, high alumina bauxite clinker is added with a small amount of clay, and after grinding, it is cast and formed in the form of a slurry by a gas generating method or a foaming method, and fired at 1300 to 1500 ° C. Industrial alumina can sometimes be used to replace part of the clay clinker for the lining and insulation of the kiln, as well as areas where there is no strong high temperature molten material erosion and erosion. When in direct contact with the flame, the surface contact temperature shall not be higher than 1350 °C.
Light weight high alumina insulation bricks
The main characteristics of lightweight high alumina bricks are heat insulation and heat insulation, which can be used in the outer layer of the furnace wall, so as to ensure the efficient use of thermal energy of the equipment, but not to cause explosion due to high heat conduction.Where contact with the flame in the hearth with heavy high alumina brick, this after the high temperature of 1775 ℃ to suppress calcination of refractory material, have very strong heat the effect of high temperature resistance and erosion resistance, long time under the condition of high temperature deformation does not fall off.
Lightweight high-alumina bricks and heavy high-alumina bricks each have their own advantages and disadvantages. Only by laying them according to different positions of kiln furnace and functions required can they extend the service life of equipment and improve the safety production level.
Should steel coking furnaces use lightweight high alumina bricks or heavy high alumina bricks?
As a large-scale high-temperature industrial equipment, steel coking furnaces are necessary to carry the melting furnace temperature up to a thousand degrees. Therefore, it is necessary to select the necessary furnace fire-resistant thermal insulation materials. For steel coking furnaces, many manufacturers choose high-aluminum. Bricks come as a raw material for masonry and maintenance.
But high alumina bricks include light high alumina bricks and heavy high alumina bricks. Which one should be used in steel coking furnaces?
In fact, in the steel coke oven and other industrial furnaces, it is mostly combined with two kinds of high-aluminum bricks. Because of their different characteristics and different functions, the use of one type alone does not fully meet the refractory insulation effect required by the kiln, so large manufacturers purchase these two materials for construction.
The main characteristic of lightweight high-alumina bricks is thermal insulation, which can be used in the outer layer close to the furnace wall, so as to ensure the efficient use of the thermal energy of the equipment without causing deflagration due to high heat conduction. In the furnace, the high-aluminum brick is used in the place where the flame is in contact with the flame. The refractory material which is pressed and calcined at a high temperature of 1775 ° C has strong heat resistance, high temperature resistance and erosion resistance, and is exposed to high heat for a long time. Does not deform and does not fall off.
Lightweight high-aluminum bricks and heavy-duty high-aluminum bricks have their own strengths and shortcomings. The two are designed for different positions and functions of the kiln to extend the service life of the equipment and improve the safety production level.
High temperature characteristics of lightweight high alumina bricks:
(1) high temperature resistance.
(2) fast cold and hot, good thermal shock resistance.
(3) good thermal insulation and thermal insulation.
(4) large porosity, small volume density and light weight.
(5) the construction is convenient, and it can be processed or cut into any size, also known as high aluminum polymer light cutting and grinding bricks.
The lightweight high-alumina bricks are mainly used for high temperature insulation layer of kiln, and can also be used for lining of kiln with flame contact, but they are not suitable for direct erosion by slag.It can also be used in kilns with hydrogen, carbon monoxide and other gases as protective atmosphere.
Technology of lightweight insulation bricks
Lightweight insulation brick production method and the general density material is different, many methods, mainly include the burning addition method, bubble method, chemical method and porous material freely method, etc.
(1) high temperature resistance.
It's also called fuel addition.Add combustible materials, such as charcoal dust and sawdust, into the mud of brick making, so that the products have certain porosity after burning.
3) chemistry.A porous product, usually dolomite or magnesite with gypsum, is obtained in the process of brick making by chemical reaction which can produce gas properly. Sulfuric acid is used as foaming agent.
4) porous material method.Lightweight firebricks are made from porous materials such as natural diatomite or artificial clay foamed clinker, alumina or zirconia hollow spheres.
The use of light thermal insulation bricks with low thermal conductivity and small thermal capacity as furnace structural materials can save fuel consumption.Can improve equipment production efficiency;It can also reduce the weight of furnace body, simplify the structure of furnace, improve the quality of products, reduce the temperature of environment and improve the working conditions.Lightweight insulation bricks are often used as insulation layer, lining or insulation layer of kiln.
Workshop corner
Packaging of diatomaceous bricks
1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000mm,
2.Load weight of each pallet: 1.5-2.0 tons,
3.230*114*65mm:512PCS/Pallet, 230*114*75mm:448PCS/Pallet.
Shipping of diatomaceous bricks
1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quanlity and quantity guaranteed, and also in accordance with the contract and customer's requirment completely.
Henan hongtai kiln refractory co., LTD. Is well aware that there are thousands of demands from customers, which can be summarized in four aspects: reliable quality, timely delivery, reasonable price and considerate service.The company will continue to adhere to the corporate spirit of "contributing to society and serving customers" and the business philosophy of "mutual benefit, win-win, integrity, efficiency, preciseness and responsibility".Our company is willing to develop a wide range of technical exchanges with colleges and universities and colleagues from all walks of life at home and abroad in a flexible and diversified way.
Henan hongtai kiln refractory co., LTD. Main products are high alumina brick, clay brick, fused zirconium corundum brick, fireproof ball lightweight insulation brick, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.For different industries, the cement industry with anti-flaking high-alumina bricks, alkali resistant bricks, phosphate bricks;Boiler industry USES all kinds of brand wear-resisting brick, corundum brick, mullite brick and other finalizing materials.The company insists on "product quality is the life, enterprise integrity is the foundation", in the fierce market competition, won many users' trust and praise.The products are sold all over the country, as far as Vietnam, India, Korea, Pakistan, kazakhstan, Iran and other southeast Asian countries and regions.
Henan hongtai kiln refractory co., LTD. : "quality first, reputation first, customer first: it is our aim."Scientific management, strong technical force, perfect testing means, advanced technological equipment and stable product quality are the guarantee of quality service.Henan hongtai kiln refractories co., LTD sincerely hopes to cooperate with you hand in hand and in good faith.
