The influence factors of refractory material mixing homogeneous degree

(1) the powder particle shape of powder particle shape is different, the time and the effect of mixing are not the same, such as approximate spherical particles in the friction force issmall, the speed of relative movement in the process of mixing, so easy to mix evenly; and angular particles within the large friction force, is not easy to mix evenly, compared with the former, mixing time is relatively longer.

(2) The influence of the structural characteristics of mixing equipment for material mixing quality by using wet mixing mill mud, uniform and dense, good plasticity, and using biaxial mixer mixing mud quality is poor.

(3) Mixed with the length of time the general situation, the mixing time is long, the more uniform mixture. Mixing stage, uniformity increases very quickly, when mixing to a certain time, another long time effect on the uniformity of is not obvious. General to join the species more or poor dispersion of mud, mixing time should be longer. For example, clay brickrefractories used in wet grinding machine mixing, time is 4-10min; silica brick material about 15min; magnesia brick material needs 20 – 25min.

The mixing time should not be too long, otherwise there will be the following: 1) the size composition is then broken and change; 2) mud fever and the influence of moisture content, or because the mud is too hot, and the moldings will elastic aftereffect increases when pressurized and spallation occur.

(4) The adding sequence of feeding sequence has great influence on the mixing, if the coarse – fine powder is added at the same time, the fine powder into small particle concentration and the emergence of “white material easy to appear”.

Generally used for feeding sequence:

1) Course feed – water and waste paper pulp – fine powder.

2) Part of pellet feed – water and waste paper pulp – powder – residual particles.

In addition, the reasonable selection of binder and properly controlling the amount and uniformity of mixing the clay.

Improve the heating and heat transfer capability of the refractory brick

Welding of zinc pot can be used when the E-422 electrode (to ensure the chemical composition). Zinc pot four angle should be circular arc, increase the zinc liquid liquidity to avoid local overheating four angles. According to practical experience, zinc pot such a production cycle service life up to 56 months by using electric heating, fuel (gas) heating can reach 45 months, coal-fired heating up to 34 months.

Zinc pot outside of bonded 20mm thickfirebrick of steel wire hot galvanizing zinc liquid in the required temperature of the best (46010) in the range of E. Temperature fluctuation is too big, liquid zinc dross in precipitation in the temperature is reduced, not only a large quantity of slag, and the deterioration of the quality of galvanized steel wire, zinc pot erosion intensified. In order to ensure the liquid zinc temperature changes in steel wire galvanizing temperature relatively small, in the design of zinc pot, the molten zinc quantity is 2025 times the amount of hourly production of galvanized steel wire, that is to say 40t molten zinc pot per hour of galvanized steel wire production cannot exceed 2T. heating mode is a key factor affecting the liquid zinc temperature change the general said, call heating fuel (gas) is better than that of heating, coal-fired heating and the worst, but from the economic point of view is just the opposite. Many manufacturers through years of practice that, if the heat source to heat its loss supplement zinc pot consumption and away in the plating steel wire heat during the process and the zinc pot, the heat in a state of balance, can achieve the ideal effect. And the characteristics of coal are heated by fire temperature rises fast, the fire temperature drop quickly hours. Zinc pot heating zone with all the lateral wall of furnace brick with polyester slice or refractory cement will firmly bonded 20mm thick brick, make flame not directly burning zinc pot wall. In order to improve the thermal efficiency of the refractory brick is coated with a layer of black fireproof coating or polyester slicing the pot wall emissivity for more than 0.9, more easily to heat and heat transfer.

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.

Special high-temperature refractory bricks

In warship power device of large, marine fuel boiler is the heart of it, if the refractory brick hearth collapsed, the warship will be unable to sail, and can not be repaired in a short period of time, will cause the occurrence of very great accident, so can the development of a
new type high-temperature refractory bricks then, we can avoid this situation happened. The special high-temperature refractory bricks must withstand strong fire baking, the endfire resistance to high? This is something we must do the experiment, the general point of gold is already very high, but the refractory brick to withstand temperature must also high than its melting point can be.

General refractory temperature can reach 1500 degrees Celsius even a super high temperature refractory material, but for many refractory materials, the degree of every increase of 50 degrees Celsius would have been difficult to exceed. Like this on the battleship using ultra high temperature refractory brick products, even the best domestic refractories and refractory brick, the use of such to any field can play a very good advantage. It is not only the heat resistance is good, the service life of the refractory material in general than is relatively long compared.

Special high-temperature refractory brick is refractory and heat insulation, practicality is very strong, but compared to the refractory brick in general, this ultra high temperature refractory brick products can not be beyond the.