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

Using requirements of boiler with refractory material

Boiler burner band main properties of refractory material should have included slag resistance, high strength, wear resistance, thermal stability, thermal conductivity and other properties. The traditional refractory belt mainly used chrome refractory ramming material, but because of the domestic high quality chrome resource scarcity, therefore is the main use of silicon carbide ramming material, silicon carbide high alumina coating material, high aluminum phosphate can be plastic, high temperature expansion plastic.

Of which the first two kinds of materials of high prices, but the long service life, good performance, and then two kinds of material price is low, but performance in general, and short service life. Therefore in the cyclone furnace liquid slag furnace and should not be used in high phosphate refractoryplastic or ramming material,to avoid peeling or cracks in use in the production, so as to enhance the slag resistance of material and reduce the repair frequency.

High-temperature micro expansion refractory plastic and super 3000 water clayrefractory material performance fairly, has shown some advantages in the application to the wall pipe and boiler furnace top. But this kind of material in its solidification time is long, easy to dry shrinkage crack, thus for the construction and maintenance of a great deal of trouble. At the same time the supplier quality there is a certain fluctuation, sometimes refractoriness and normal temperature strength of less than 1580 degrees and 981N/cm2.

Selection of additives in firebrick

Resin bonded carbon magnetite brick because of its good thermal shock resistance and slag resistance of iron and steel industry, in particular applied basic oxygen furnace and electric arc furnace. Carbon has excellent performance such as high thermal conductivity, low thermal expansion coefficient, high heat shock stability, at the same time and wettability of the job of slag has good corrosion resistance and anti erosion ability. As is known to all, the brick body carbon easy oxidation, which restrict its use in high temperature, the oxidation of carbon from the beginning of the 300 DEG C, with the increase of temperature oxidation speed.

Ceramic materials (SiC, carbon silicon oxide) do coating in the flake graphite or carbon fiber, were impregnated with phosphate, cement foam board price and the use of surface glaze etc… These expensive methods used in the refractory brick have certain limitations, another method is through the steam treatment of fine particle boron, TiB2, ZrB2 and SiC and other materials to do thermal barrier coating on graphite or carbon composite material.

A common method of refractory brick is to add fine-grained antioxidant materials, such as in MgO C SiC, B4C, brick added metal Al, Mg and (or) Si to prevent or limit carbon at high temperatures (> 1400 C) oxidation. Also, these additives are expensive, and can not completely prevent the oxidation of carbon at low temperature. Coating solution by liquid mixing 60% solid and 40% made, wherein the liquid binder is phosphoric acid and ethanol (liquid solution 30%) mixture. The outer coating brush MgO C brick thickness is about 0.8mm, the sample coating drying at room temperature is about 10min. In practice, the ladle after 5h pre heated to 1200 DEG C, because of some difficulties in the process of steel-making and sometimes need a longer time.