How to choose the refractories

How to choose the refractories

Refractory varied, variety, when we should try to buy when the refractory choose the most suitable, and often the most appropriate

Is not necessarily the most expensive, but also can save us from a fee.

1.       According to high-temperature kilns required refractoriness to buy: refractoriness of 1580-1770 degrees refractory to ordinary election,

the degree of refractoriness need 1770-2000 election advanced refractory, refractoriness above 2000 degrees you need Select grade refractories.

2.       According to the chemical properties of high-temperature furnace to buy: There are three general, acidic refractories, neutral refractories, basic refractories, be sure to select the corresponding chemical properties of refractories, otherwise chemical changes occur at high temperatures, causing serious losses.

3.       According Uses Optional: Different different industries have need of refractories, refractory different position with different refractories, refractory steel with steel industry; non-ferrous metallurgical industry refractories. Refractory Petrochemical petrochemical industries. Glass kiln, cement kilns, ceramic kiln with silicaterefractories; generating boiler power industry refractories; waste incineration with melting furnace refractories.

4.       According to pre-assemble the results to buy, under normal circumstances, we require manufacturers to provide pre-assemble refractory effect, which can calculate the required specifications and quantity of refractories. At the same time we must choose refractory samples provided by the manufacturer, so that by the time of delivery can be kind of receipt, to avoid shoddy version.

5.       Branding issues, and now thousands of refractories manufacturers, big and small. If you buy the special requirements and special purpose refractories can find a Sino-foreign brand manufacturers, or specifically to do this special refractories manufacturers, of course, the price will be more expensive than domestic brands about 20%. General Refractories can choose to domestic brands, while some of the information depends on the manufacturers,

for example, whether through the ISO certification, business licenses, etc., you can also look up the Internet, or to inquire about nearly brought down the industry in which manufacturers use refractories.

6.       Service. To select more recent service outlets factory, so if an exception occurs in the brickwork, the manufacturer's technical staff can quickly arrived at the scene to avoid further loss. There are warranty issues. Under normal circumstances, the first year you have any questions, manufacturers must free one-year warranty.

7.       When determining the purchase generally need to pay a deposit, if it is convenient to go to the manufacturers should look at the way manufacturers look at the size, strength, and to avoid being defrauded false deposit.

Analysis of the furnace refractory fiber shedding

The use of coal tar as a trolley furnace heating fuel, did not use the media atomization or purge, often caused by poor atomization flame and combustion endless phenomenon of black smoke and coke burners serious, on the surrounding environment cause great pollution.

Because it is artificial ignition, Yilong refractory fiber board left some gaps around each burner for ignition purposes, the ignition process, coal tar easily leak from the ignition mouth, unpleasant taste, acting on the skin will cause a variety of toxic dermatitis, and long-term inhalation can cause nasal injury, leading to cancer.

Due to the use of coal tar, fuel burning ember of the lower part of the fuel and the combustion flue gas flow with the dust, erosion and attached to the furnace wall, causing cooling the outer surface of the furnace wall refractory fiber compaction, formed on the surface of the furnace wall refractory fiber tension, causing refractory fiber powder and caused chunks off, shortening the life of the furnace.

Sealing mechanism using a knife in the form of letters, the use of positive pressure stove running, forged into the workpiece when the car needs many times

the material, so that the blade moving sands production region accumulation tank seal uneven, resulting in lower blade seal, the seal poor areas appear hot flue gas spills, foam isolation seal groove with a blade or burned, the sealing effect rapidly reduced after a vicious cycle.

 On the part of the car with a small gap between the furnace wall trolley furnace refractory, heat distortion seal groove blade or even affect the normal out of the trolley, and therefore had to knock out the hot stove inserts to improve the car's normal into the furnace, which will result in a flaming furnace trolley serious.

Refractories used in steel smelting

Blast furnace refractories:

Development of blast furnace ceramic cup increasingly common, but require high corrosion resistance of refractories application to ensure its life extended. In addition to changes in the design of the refractory material respects, great changes have taken place, such as a micro porous carbon brick ordinary charcoal instead of the past in order to reduce the penetration of molten iron. Clay refractory bricks used as raw material can adapt to the requirements stemming mouth of iron. Grouting method using blast furnace repair backing backing can effectively prevent the erosion of hot air, thereby extending the life of the blast furnace lining.

Clay refractory bricks used as raw material can adapt to the requirements stemming mouth of iron. Grouting method using blast furnace repair backing backing can effectively prevent the erosion of hot air, thereby extending the life of the blast furnace lining.

Converter refractories:

In steelmaking, the kind of water-cooled technolovgy and suspension systems are in the upper part and the lower cone barrel parts BOF shell has been applied, thus reducing the converter furnace deformation, extending converter lining life, improve productivity converter. These new technologies have some impact on the use of refractories. So that the converter furnace furnace up to 4000 more than the average, combined with gunning, the application of high lime and dolomite applications and slag splashing technology, furnace over 10,000 times is not a problem. This is the direction of development of refractories producer worth attention.

Submerged nozzle for continuous casting:

Since the development of the system of casting tundish transfer station from the past into the present effects of cast steel quality and increase the productivity

of the metallurgical vessel. Therefore, many functional materials gradually applied in the middle of the package, such as slag dam, impact plates, filters, plugs, etc. argon permeability.

Submerged nozzle as an important function of continuous casting refractories, research carried out mainly focused on two aspects, one is to improve the corrosion resistance of slag line, the second is to reduce the inner wall of Al2O3 attachment. Take the ZrO2 content increased 88%, as well as a good measure of the particle size distribution can reduce the thermal expansion coefficient and porosity of products, improve the density improvement slag resistance.

Wall insulation materials

Wall insulation materials currently available production equipment is mainly divided into two types: one is ordinary powder mixer, the second is dedicated external wall insulation mortar equipment. Both devices have advantages and disadvantages:

Do Wall insulation materials Wall insulation materials are aware of the mixing process was very strict, if the material is uneven mixing or higher breakage rates, will affect the insulation properties of the material. General powder mixer mixing equipment can also be used as wall insulation materials, but only mixed general Wall refractorymaterials, produced by the external wall insulation performance insulation products generally, construction of residential insulation performance requirements of applicable.

The single wall insulation mortar equipment such as inorganic hollow glass beads equipment, is designed for mixing equipment glass beads, glass beads stirred such equipment is the best equipment. Its high mixing efficiency, the use of double-cone breakage rate is relatively low, the production of insulation materials is the best. Currently much of this equipment manufacturers, domestic production is only so few. As people continue to attach importance to energy saving, new wall insulation mortar equipment will gradually be widely promoted.

In short, the wall insulation mortar compared with traditional dry mixer devices with high mixing efficiency, no broken material does not affect the physical properties of materials, etc., is the ideal equipment external insulation materials.