Classification and application of mullite insulating bricks

Classification of  mullite insulating brick:

Mullite insulating brick is different according to the density is divided into light and heavy mullite brick, according to the use of different temperature are divided into: 1350 mullite bricks, 1450 mullite bricks, 1550 mullite bricks etc..

Performance and application of mullite insulating brick:

Refractory degree is high, can reach more than 1790 DEG C. Refractoriness under load was 1600 ~ 1700 DEG C. Compressive strength of 70 ~ 260MPa. Good thermal shock resistance. Sintered mullite brick and fused mullite brick two. Sintered mullite brick with high alumina bauxite clinker as the main raw material, adding a small amount of clay or raw bauxite as binder, after molding, sintering and made. Electric cast mullite brick with high alumina, A12O3 and refractory clay as raw material, adding charcoal or coke fines as a reducing agent, after forming by reduction of electric melting method to manufacture. Crystal fused mullite than sintered mullite, thermal shock resistance than sintered products. Uniformity of content in the high temperature properties of alumina and mullite mainly depends on their distribution and glass. Mainly used for blast furnace hot blast stove top, bottom, and glass furnace regenerator, ceramic sintering furnace, petroleum cracking system dead lining.

What is fire resistant plastic

Fire resistant plastic is composed of 70% ~ 80% granular and powdery materials, plus 10% ~ 25% plasticity clay binder and refractory material amount of plasticizer prepared.

Plastics can be made into flake, lump. Some bond can be added in the construction. Whenusing the mixture compaction or ramming, when baked to form dense lining and structures. In the pre hardening plasticity is good; with certain strength after hardening. Have good sintering performance and volume stability of certain and other high temperature properties at high temperature. A stiff mud paste, and keep in a long period, high plasticity clay plasticity contain more points, water is ramming material much. Mainly used for various heating furnace is not in direct contact with the molten material, material for clay and high alumina, there are silica based, magnesia and chrome, zircon and silicon carbide etc..

Mainly used for lining of the body in the iron and steel industry for various kinds of heating furnaces and soaking furnace, annealing furnace, sintering furnace and furnace top etc..

Visual inspection and processing of pre laying refractory material

Boiler refractory brick masonry for planning is not the same for different, some refractory brick standard and scale error can not be satisfied with the penetration of building qualityrequirements, especially for hook range, azimuth and swollen joints of pipeline and the demand of pre laying refractory brick selection, processing or modification. According to the construction unit and product properties of refractory brick and insulating materials, all need the rainproof, moisture-proof, masonry construction is in the boiler plant engineering all completed before beginning construction, time is very tight, so the construction preparation work is very important

Some of the furnace body layout on boiler lying disorderly and the quality demand strict site, use of shaped refractory brick masonry part, a part of elected for pre laying, the pre laying intention:

1 see refractory brick shape is the quality demand is not to the satisfaction of the refractory brick masonry, according to the supply of a variety of refractory bricks and viewing and processing are not the same error mutual deployment status of application.

2 see planning drawings and refractory brick use is not a fault.

3 the operation personnel know characteristic and quality requirement of furnace body layout, understand the methods of operation, construction and what information the application state.

4 see refractory brick masonry function and quality status of mud

5 pairs of new materials, new technology and new method of operation to experiment

Pre laying flat places usually consolidation in the room. Refractory brick and method of operation of the use of the pre laying all should be the same as the formal construction conditions, in order to truthfully reflect the existence of doubt. The pre laying results should be recorded, about the existence of doubt to have solutions.

Modulation principle of slurry used for refractory brick

Brickwork with refractory slurry should follow the following principles:

(1) to deal with all kinds of refractory slurry pre experiment and pre laying brick front, confirm the bonding time, different mud initial setting time, consistency and water;

(2) Modulation of different mud to use different instruments, and timely cleaning;

(3) Modulation is not homo0geneous slurry to use clean water, water should be accurate weighing, blending uniformly, adjusted with the use. Have good hydraulicity and modulation of hard mud shall not add water use, has the initial setting of mud may not continue to use;

(4) Modulation with phosphate mud to ensure material time trapped provisions, with the use of post set, well modulated mud arbitrarily diluted with water. This kind of mud for corrosive shall not be in direct contact with the metal shell.

We take the zero defect management idea, through the production process from beginning to end. All the time since, in the pursuit of perfect quality at the same time, also constantly improve the service system, concerned about each of your needs, to provide professional sales and technical service for you.

Today we introduced these simply! If you are interested in our refractory  products, you can also access http://www.yilongrefractory.com  or  http://www.chinafirebrick.com

Water glass refractory material load

Load softening temperature learned from many test results, refractoriness water glass softening temperature usually begins with the heating temperature of a heating state after cooling refractory brick dust as fine grinding admixture of quartz sand as fine grindingadmixtures, compression temperature compression temperature for a load softening temperature and amount of water glass of water glass modulus sodium fluorosilicate content and aggregate type on.

It is the amount of water glass, refractoriness under load as the starting and the amount of water glass by load softening temperature increase, the corresponding and reduces the water glass modulus increased, load softening temperature corresponding increase, forming a proportional relationship, inorganic silicon compounds bonded refractory application development table refractoriness under load start point compression% load softening temperature is an important thermal properties of water glass and refractory material, so it should not be in thermal engineering with low modulus of water glass.

Aggregate type on load softening temperature impact load softening temperature aggregatename starting point compression brick magnetite refractory clay brick sudden cold and hot water glass refractory material has good thermal shock, in the air is subjected to time cold and hot, dry strength strength of not less than. Using three kinds of aggregate effects of rapid cooling and heating of water glass refractories. The relationship between the factors and the amount of water glass modulus and hardening agent content has little effect on sudden cold and hot experiments, and the influence factors of diameter larger species feeding.

Cold and hot water alternately performance in weight loss material name times water alternating times to strength without silica brick magnetite refractory clay brick test results show that the silica brick and magnesia brick water glass refractory thermal shock performance is poor, and refractory clay brick has good performance, the former only once.

The erosion mechanism of refractory brick

Both the wet process kiln, or new dry rotary kiln, in the clinker calcinations process, because the kiln gas temperature is much higher than the temperature of the materials, kiln rotates one circle, kiln lining surface is subjected to thermal shock cycle, changes in temperature range of 150 ~ 250 DEG C, 10 to 20mm in the kiln lining surface within the scope of generating heat stress. Kiln lining also bear due to the rotation of the brick kiln alternating radial and axial mechanical stress, and calcining materials erosion wear. Due to simultaneous silicate melt, easily in the environment of high temperature and kiln refractory lining surface interaction between the formation of the initial layer, and at the same time along the internal refractory brick pores to refractory bricks, refractory bricks with bonded together, make the refractory brick surface 10 ~ 20mm within the scope of the chemical composition and phase composition changes, techniques to reduce the performance of refractory brick. When the sintering range of material forming narrow or short flame burning urgency to produce local high temperature, the lowest temperature of kiln will make the skin surface is higher than that of material liquid solidification temperature, kiln skin surface layer from solid to liquid and fall off, and from the outside to the inside into the initial kiln crust is formed after the initial layer of the new kiln crust. When this happens repeatedly, firing zone kiln gradually thinned, even completely off, leading to local exposed kiln body and red kiln. In fact, firing zone kiln lining damage is that, in the high temperature region residual firebrick thickness is substantially larger radius of curvature of the curve distribution of arc bottom, sometimes falls on the inner surface of the kiln.

Relationship between refractory brick wear resistance and temperature

What is the relationship between the wear resistance of  refractory bricks and temperature, so here simply said what is the relationship between the wear resistance of a refractory brick and temperature.

Some materials such as silicon aluminum refractory brick, it is generally believed that under certain temperature (such as 700 ~ 900 DEG C within the elastic range), the higher thetemperature wear resistance is lower, can think that when temperature increase with the increase of elastic modulus decreased, wear resistance. When the temperature rises, reaching a maximum of elastic modulus, with lower elastic modulus, wear resistance increase instead. Such as aluminum silicaterefractory brick in 1200 ~ 1350 DEG C, wear resistance even better than normal temperature, when the temperature is further increased, up to 1400 DEG C + for refractory brick in liquid phase viscosity decreases sharply decreased, wear resistance. Some brick such as chrome quality products, with the temperature increasing, the wear resistance increased.

Above is the small make up to introduce the content of refractory brick, for more information, welcome to inquire or click the view http://www.chinafirebrick.com/Fire-Brick11.html. For the product, Changxing refractory material factory, welcome to visit: http://www.chinafirebrick.com