Clay refractory castable

Clay castable refers to castable with a content of AL2O3 greater than 38%, and high aluminum castable refers to high aluminum aggregate with a content of AL2O3 greater than 50% as granular raw material. It has high fluidity, suitable for construction by pouring method, and can harden without heating. Clay refractory castable consists of refractory aggregate, powder, binder, admixture, water or other liquid materials. Generally in the use of the site by casting, vibration or tamping method casting molding, can also be made into prefabricated used.

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This series of refractory castable is made of clay clinker and fine powder as raw material, mixed with micro powder additive and cement as binder, which is used to fill the gap between steel brick of furnace throat and shell and the secondary casting layer of the lower part of water-cooled tube of furnace bottom. It is used in the bottom screed of water cooling pipe or the inner gap of steel brick of furnace throat and the gap between steel brick and furnace shell, and also used in hot air furnace system.

Clay refractory castable series for aggregate with bauxite and flint clay, silica powder, calcium aluminate cement, water reducing agent prepared general castable, choose corresponding grade aggregate, mixture volume density of 2.2 clay castable for customers to use. The refractory product compact structure, high temperature performance is good, good thermal shock resistance and abrasion resistance, construction is convenient, suitable for all kinds of neutral industrial kiln lining.

The clay castable is widely used in a variety of industrial furnaces, the general use temperature of about 1000-1200℃. The aluminum content of clay castable is about 45%. The compressive strength is about 30Mpa. If the thermal shock requirements are high, we must use tertiary clinker for aggregate production, now, there are a lot of waste tertiary brick clay aggregate, aluminum content and refractoriness are no problem, but the thermal shock will be less.

So, buy clay refractory castable cannot listen to price only, price decides quality, not empty at all, take 3 class waste brick and 3 class clinker make castable, the price is about to differ several hundred, and a few customers, listen to price, think that low that clinch a deal, actually this has a lot of quality discretion problem inside. The bulk density of clay castable is different from that of clay-based tight castable. Generally, the bulk density of clay castable is 2.1g/cm3, while that of tight clay-based castable is 2.3g/cm3. This is because the material with other substrates is added in the process of tight clay- based castable, which is more resistant to slag and erosion.

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The quality of clay castable varies greatly, so the use of furnace temperature and erosion must be seen when selecting. We are professional refractory material manufacturer, we are committed to the production of high quality refractory products, and many customers to achieve friendly relations of cooperation, welcome to consult the procurement.

Clay binder is one of the main materials of clay refractory castable and an important component of matrix. Therefore, the variety and dosage of clay binder have important influence on its properties. There are many kinds of clay, and the clay in each place has different properties due to different mineral sites. In short, if the choice of clay binder is proper, the refractory castable with good performance can be prepared.

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The dosage of clay binder is 9%~12%. Because the combined clay contains more low-melting point substances, the fire resistance performance is poor, in order to meet the technical requirements for the preparation of clay castable, it should be reduced as much as possible. The effect of the type and amount of coagulant on the properties of clay refractory castable. For the compressive strength at normal temperature and 1400℃, the effect of ca-70 cement is better than that of ca-50 cement, but the cost increases greatly. With the increase of the dosage of coagulant, the compressive strength of normal temperature increases continuously, while the compressive strength of 1400℃ decreases continuously.

In the clay refractory castable, refractory aggregate plays the role of skeleton and is an important part of it, accounting for 60%~70% of the total material. Refractory aggregate varieties according to the content of Al2O3 as the data, with the increase of Al2O3 content, high temperature compressive strength, softening temperature under load starting point is also increased, softening temperature under load are more than 1520℃, grade iii alumina clinker aggregate slightly higher. Therefore, grade 3 bauxite clinker is widely used as refractory aggregate for common clay refractory castable, and good results have been obtained.

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The grading of refractory aggregate used for clay castables, the variety and fineness of refractory powder, water consumption and construction conditions, etc., also have certain influence on its performance ring, and the basic similar to the cement refractory castable, no need to repeat; There are many kinds of dispersants, through screening, sodium tripolyphosphate is widely used, and good results have been obtained dispersion effect.