With the correct operation of the method can reduce the porosity of the refractory bricks

Use the correct method of operation can reduce the rate of porosity of refractory brick. We always meet the refractory brick appear excessive porosity of refractory brick, how can we reduce the occurrence of such a situation?Today we shall all the requirements to introduce how to decrease the porosity of refractory brick rate.

Selection of high density, low water absorption rate of raw materials, through reasonable distribution is the key to prepare low porosity refractory brick. Refractory brick is used in 50% of soft clay and 50% hard clay clinker, ingredients according to a certain size requirements, forming, drying, firing at high temperature 1300~1400 ℃. Refractory brick is mainly kaolinite mineral composition (Al2O3 2SiO2 2H2O) and 6%~7% impurities (potassium, sodium, calcium, titanium, iron oxide). Sintering process is mainly kaolinite continuous dehydration decomposes mullite (3Al2O3 • 2SiO2) crystallization process. Refractory brick in SiO2 and Al2O3 in firing eutectic of low melting of silicate and impurity formation process, surrounded by mullite crystals around. In the burning process of the highest temperature control in 1350 ℃ to 1380 ℃, proper increase of low porosity clay brick firing temperature (1420 ℃), firebrick contraction increased slightly, so that the refractory brick density increases slightly, low porosity can be reduced.

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Technical requirements of castable refractory construction

Castable refractory construction technology requirements:

Anchoring nails welded framework supporting, castable construction, casting, curing, and form removal.

(A) Anchoring nails welded

1 .Anchor nail materials and specifications must be in accordance with the design requirements of the procurement.

2. Distribution and welding quality anchoring nails must be according to the design requirements.

(B) Framework supporting

1. Accurate size, meet the design requirements.
2. Support firm, tight seams ride, missed pulp.
3. Corrosive or strong adhesion castable site isolation layer should be in the template.
4. Reserved for expansion joints of wooden strips should be fixed firmly to prevent vibration during that shift.
5. Before pouring, the template should be brushing release agent.

(C) Castable refractory construction

1. Castable once stirred volume should be limited to less than 30min run.
2. Castable should continuously pouring, pouring the first layer of material before the initial setting, the next layer should be finished pouring castable, if intermittent exceed its initial setting time of construction, construction joints should be required to deal with.
3. When using plug-in vibrator, pouring layer thickness should not exceed 1.25 times the length of the vibrating rod action part, when using flat vibrator, its thickness should not exceed 200mm.

(D) Chaimo

1. Does not load the template should be castable strength to ensure its surface and edges are not damaged due to release the case of form removal.
2. Load a template; you should castable strength of more than 70%, before form removal.

Light and heavy division of alkali resistant castable refractory

Alkali resistant castable refractory in high temperature, resistance, alkali metal oxide erosion refractory called alkali resistant refractory castable. This kind of castable castable combined with ordinary calcium aluminate cement is similar, it is composed of a mixture of alkali resistant refractory aggregate and powder, binding agent and admixture. According to the environment and use condition of different alkali resistant castable refractory material, light and heavy division, and heavy and can be divided into temperature alkali resistant castable refractory and high temperature alkali resistant refractory castable.

1. Light alkali used in refractory castable ceramic aggregates has alkali materials, porous clay clinker, scrap porcelain material, high strength and expanded perlite. Binders with ordinary calcium aluminates cement. Matrix castable refractory powder may be added to high-silica, at an elevated temperature so as to react with the alkali metal oxides, the glaze layer is formed form a dense layer on its surface, to prevent the melt of alkali metal oxide further penetration and corrosion.
2. Heavy Alkali temperature castable high alumina used in aggregate has guessed, clay guessed so on. Use of calcium aluminate cement binder plus silica microparticles, adding silica microparticles help to improve both the strength of castable combination also helps in use, castable lining impermeable layer formed on the surface, which is characterized by intensity and temperature considerable strength after drying, good alkali corrosion performance.

Quality of the refractory material in related in the using raw

The quality of refractories and related Raw that you use. In the refractory, with a variety of species, such as high alumina bricks, clay brick, corundum brick, castable, refractoryproducts manufactured different, you need to use Raw have different chemical and mineral composition.

Refractory materials are all fundamental refractories, refractory raw materials directly affects the quality of refractories, has a decisive significance for products bearing capacity, quality, only quality raw materials plus a reasonable manufacturing process to produce high-quality refractory products.

Requirements for refractory Raw, first of all have suitable chemical into a thick mineral impurities combined amount should be less, and more uniform distribution of impurities as possible; Furthermore, it should enrich nuclear resources, facilitate the exploitation, low into the wood, because the production of refractory products cost is largely determined by the price of raw materials.

Luoyang Yilong Refractories Co., Ltd., for many years experience in production of refractory materials, has a leading international leading consciousness in refractory materials selection, Yilong refractories, welcome your come.

Composition and properties of magnesia brick

Magnesia brick is magnesium oxide containing not less than 91% and calcium oxide not more than 3%, alkaline refractory products that percales are the main minerals.

Magnesia brick phase composition of percales 80%­—90%, magnesium ferrite (MgO • Fe2O3), magnesium olivine (2MgO • SiO ₂) and calcium magnesium olivine (CaO • MgO • SiO ₂) a total of about 8% to 20%, magnesium, calcium, iron and other silicate glass about 3% 5%. these silicate may containing three calcium silicate (3CaO • SiO ₂), MERWINITE (3CaO • MgO • 2SiO ₂), calcium and magnesium olivine, forsterite, two calcium silicate (2CaO • SiO ₂) etc..

Magnesia brick characteristics: good heat conductivity; thermal expansion; resist alkali slag resistance, resistance to acid slag properties; load deformation temperature because of percales grains surrounded by silicate cement of low melting point, is the starting point is not high, but the collapse temperature and starting point of difference; refractory degree higher than 2000 ℃. But there is no significance for practical use; poor thermal stability is the main reason for the destruction of the general use. In the storage and transportation; should pay special attention to moisture proof; from back after the break easily.

How to introduce the refractory brick density to others

When customers purchase firebrick from us, and we certainly have to introduce them a range of knowledge about firebrick, and the density of firebrick most need to know, let Yilong technician to tell you how to introduce customers firebrick density.

Firebrick densities are based on different raw materials to the decision, because if the density of refractory bricks are the same, then it shows all aspects of the refractory bricks are the same, so if we choose firebrick, what does that mean? The density of the refractory bricks so we made ​​a classification according to the material used in refractory bricks. The density of the refractory bricks and refractory bricks may also be resistant to some of the impurities in the outside world.

Refractory bricks density of different materials:

Ordinary firebrick: 1.8 ~ 2.0g / cm3

Dense firebrick: 2.05 ~ 2.20g / cm3

Silica brick: 1.80 ~ 1.95g / cm3

Magnesia brick: 2.60 ~ 2.70g / cm3

Alumina magnesia brick: 2.90 ~ 3.00g / cm3

Alumina bricks: 2.25 ~ 2.30g / cm3

Comprehensive above described, for the density of refractory bricks knowledge you have some understanding of it, so you know how to introduce others firebrick, if you want to ask for more knowledge about the firebrick remember to consult us.

How to remove the refractory on the castable furnace

Castable after prolonged contact with thermal furnace wall, they will have chemical reaction, penetrate the lining, causing damage or corrosion of furnace lining, then how to deal with the furnace refractory castable on a lot of people became troublesome problems. Today, our experts will give you a brief introduction on the furnace refractory castable removal methods.

When removing the refractory castable, we must first understand the environment and the surrounding thermal furnace refractory castable life. In the demolition process refractorycastable, we should be careful not to make dust, debris, and other impurities mixed adhesion refractory castable, in order to avoid physical and chemical reaction to produce other good clean impurities. Moreover, we need to dismantle down the different categories of refractory castable, remember not to arbitrarily debris piled together. Construction workers also pay attention to put a dust mask or respirator when removing refractory castable avoids debris into the eyes, nose and mouth.

Here, we simply introduce a bit on the furnace castable refractory removal method, if you want a better understanding on the furnace refractory castable removal methods, you can log on to our website can also call our service sales Hotline.