Refractory materials commonly used in neutral and alkaline induction furnace

Neutral and alkaline lining is used only for induction furnace capacity of less than 10 tons. The cost is much higher than the acidic lining lining, so must meet the smelting efficiency is very high to the economy. Neutral and alkali furnace refractory material is sexy:

(1) Sintered magnesia. The erosion of the sintered magnesia against molten metal and slag is very good, and high refractoriness, disadvantage is the contraction occurred two times during sintering, resulting in cracks and voids. Risk also contained the fully sintered, affect the elastic. Cause of crack;

(2) Fused magnesia. Electric volume stability of fused magnesia is good, but expensive than sintered magnesia.

(3) Magnesia – alumina – spinel. Magnesia – alumina – spinel due to volume expansion appears in the formation of spinel, so as to compensate the shrinkage of magnesia. Degree of expansion by the number and shape of corundum and mineralizing agent control.

(4) Chrome magnesia – alumina – spinel. Chrome magnesia – alumina – spinel besides the advantages of the spinel, also has good thermal stability;

(5) The calcium oxide crystallization. Calcium oxide crystallization created favorable conditions for dephosphorization and desulfurization, but easy to crack, and cooling easily. In addition, the stove temperature will absorb moisture, so it is in danger of hydration. The crystallization of calcium oxide lining can neither be ramming material, also can not be made into refractory bricks used in induction furnace.

Advantages of insulation with lightweight insulation material

The bottom of the structure the general use of lightweight thermal insulation material as thermal insulation layer, using castable pouring work layer. With the bottom structure of refractory brick masonry structure is a traditional the integrity is good, long life and other advantages, but there are still some problems.

The overall casting after demoulding difficulty bottom (water seal groove template not taken); (2) the bottom ring expands outward shift; (3) drying by heat broke surface, bottom not easy bake, slightly careless, cause the bottom burst.

In view of the above question us on bottom structure and materials to improve the,

(1) the working layer adopts a fast drying anti explosion refractory castables, the castable short demoulding time, with quick drying explosion-proof function, is not easy to burst the oven, and high strength, good thermal stability, excellent properties of anti oxide skin good erosion resistance, is the ideal material for bottom layer of work, coupled with the unique construction technology, can ensure the bottom the working layer is not outward shift ring expansion.

(2) outside the ring edge using the perform, pouring working layer without formwork, thereby solving bottom construction not good demolishing difficulty, but also ensure the bottom of inner and outer ring between the girth size.

(3) Will work thickness, the thickness of thermal insulation layer thickened, improve the insulation performance of the bottom.

With the development of refractory industry technological progress, a number of high-quality refractory casting material is adopted, the structure of the furnace wall has improved, layer thickness becomes thinner gradually thickening, thermal insulation layer thickness, which is beneficial to improve the insulation performance of the furnace wall, but note that the particularity of annular furnace wall structure, i.e. furnace wall thickness ratio furnace wall width of some.

Refractory material additive

Refractory material increase agent is what? Plasticizer is a kind of viscous material, is also a kind of surfactant. Plasticizer plasticizer mechanism is very complex, with the chemical
properties of the different plasticizers, the plasticizing mechanism or plasticization is different, such as the use of plastic clay plasticizer, and its mechanism is: plastic clay water, clay particles will dissolve in water and the formation of clay particles. Adsorbed water layer of clay particle surface, the water film can reduce the friction between the particles under the action of external force, the easy displacement between the particles and the external force is removed, can still maintain the deformed shape, which is plastic clay has the reason of plasticizer, and use organic plasticizer.

Such as methyl or carboxymethyl cellulose plasticizer the plasticization mechanism is: they are soluble in water swelling into a viscous colloidal solution, and strongly adhered to the refractory material particles, plays a role in flexible Federation between particles, this coupling will not fracture by particles occurs between displacement and force, which easy to deform, and the external force is removed after still can keep the deformed shape.

In the refractory industry, commonly used plasticizer inorganic plastic clay (bentonite clay) various oxide powders; a methyl cellulose organic, lignite sulfonate, alkyl benzene sulfur compounds etc… But the general use of inorganic and organic composite plasticizer effect is good.

Measures should be adapted to refractory material dust serious damage

Refractory powder is not the same degree of free silica rich, up to more than 90% free silica content in the meantime silica brick. Therefore, the most serious dust damage is silica brick, followed by clay brick, high alumina brick, and magnesia brick.

China refractories Production Company is severe silicosis incidence condition. Since liberation, although adopted a series of dustproof measures, but the rate is still higher incidence of silicosis. Dust damage refractory works not only the formation of damage is serious, and give the company to infinite economic loss. Due to silicosis patients not only consumption to the company a substantial medical cure cost, and form a direct economic loss of great. Therefore, do a good job of refractories production of dust is very important.

Refractory material production should adopt mechanization, the production closed, and the succession, try to cut the material transfer links, drop drop height of material, and shorten the delivery of material interval. The same nature of the production process equipment should be gathered and resettlement, and satisfied with the working demand vertical or horizontal pipeline. Production equipment placement, conditions for reasonable placement of dust should supply the necessity of the system, and for the dust removal equipment maintenance places set aside to meet.

The above is about refractory material dust damage to adopt measures introduced, to help you expect after reading, if you have other questions to consult to contact us.