The reason for the decline in the quality of refractory castables

1. Regarding the quality of refractory castable construction, there are four main points to focus on: the planning and construction quality of the anchor, the moisture content of the castable during construction, the temperature at the time of construction, the post-maintenance and the baking of the refractory castable grilled.


2. In the process of mixing the castable with water, the amount of water added is crucial. For example, if the amount of water added is too large, the castable will appear relatively thin, and the fluidity will increase, which will affect the construction strength of the castable. However, if the amount of water added is too small, it will cause the aggregate and the powder to be difficult to mix and cause accumulation, which will result in loose structure and deteriorating construction quality.


3. The important factor in the quality of the castable is the temperature. Short-term sudden changes in temperature can cause the castable to be damaged quickly, and then the quality will be seriously degraded, and even if it is not used, it will fall off. The thermal shock sta   bility of the castable is very weak before construction is completed.


4. Cement dosage, cement is an important material to determine the strength of refractory castables. Generally speaking, with the increase of cement dosage, the normal temperature compressive strength increases, the high temperature strength decreases, the refractoriness and load softening temperature decrease continuously, and the line shrinks after burning. The rate also increases. Some manufacturers will shoddy the product, causing the castables to fail to meet expectations.

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Yingkou Ruizhi Refractories Co., Ltd.

Yingkou Ruizhi Refractories Co., Ltd. is a professional China manufacturer of refractory material for high temperature melting furnaces.Ruizhi Refractories supply main products are: Refractory material, refractory brick, refractory castable,refractory nozzle, ceramic fiber, fire brick, insulation material for converter, electric arc furnace, ladle, LF furnace, tundish, foundry ladle, torpedo ladle, etc. Ruizhi has established technical cooperation relationship with some refractory research institutions and universities. Ruizhi Refractories products have been exported to such as South Africa, Australia, Canada, Malaysia, Bangladesh, Iran, Saudi Arabia, UAE, Iraq, Pakistan, Philippines, Vietnam, Singapore, Tajikistan, Indonesia, South Korea, Sri Lanka, Nigeria, Kenya, Ethiopia, etc.

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Kiln refractory selection method

refractory material

1, kiln performance and thermal characteristics. Such as intermittent work of the furnace should use refractory brick china low heat capacity of the material.
2, the safe use of materials temperature, thermal conductivity system, high temperature strength, chemical stability.
3, the use of life.
4, investment costs and maintenance costs.
In general, heavy refractory materials are more focused on a certain technical performance indicators, such as high temperature stability, chemical stability, etc .; light insulation materials more pay attention to put into operation and comprehensive technical and economic indicators.
The selection of lightweight insulation materials, the general thermal conductivity is used insulation material (λ) furnace refractory suppliers and the cost per unit volume of insulation material (P) to determine the value of the product of "λΡ" the smaller the better. Thermal conductivity value is small, indicating insulation material insulation effect is good, low energy costs during operation. The low cost per unit volume of refractory China insulation material indicates that the investment cost is low and the investment economy is good. You can use the graph plotting diagram selection, abscissa for the working temperature, ordinate (λΡ) good plot, the material safe use of temperature interception of the curve of the material, select the technical and economic performance of the material.

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Insulation refractory materials for aluminum electrolytic furnace and tank construction furnace

refractory materials

Aluminum electrolysis furnace, tank construction furnace insulation refractory materials mainly include the following three:
(A) diatomite thermal insulation material
Diatomaceous earth is the algae organic matter after corruption, the formation of the crustal changes. The main component of diatomite is amorphous silicon dioxide is generally between 70% and 85%) and a small amount of clay impurities, the melting temperature in the range of 1000 ℃ to 1200 ℃. Diatomaceous earth is composed of fine stomatal organization, its porosity up to 85%, so it has good thermal insulation properties, is widely used as a thermal insulation material.
1, diatomite asbestos powder (chicken feather ash), diatomite asbestos powder is a powder insulation material, made of asbestos fibers and diatomaceous earth powder; which accounted for 85% of diatomite powder, fiber 2-5 mm Asbestos accounted for 14%, 5 ~ 20 mm of asbestos accounted for l%, it is used to masonry Insulating refractory brick wiping surface.
2, light diatom brick, light diatomite brick is made of diatomite and additives by molding, drying, at 850 ℃ a 900 ℃ firing. Diatomite refractory brick suppliers bulk density, porosity, heat resistance at 1280 ℃ above, therefore, light diatomite brick can only be used in the insulation below 900 ℃, can not directly contact the flame. In case of high temperature, it will produce shrinkage, or even melt.
(B) asbestos (insulation materials)
Asbestos is the only natural mineral fiber that can be loosened into elastic fibers. According to the different natural conditions at the time of creation, the asbestos and amphibole asbestos can be divided into two categories, the most widely used asbestos asbestos, also known as chrysotile, its chemical formula is 3MgO · 2SiO2 · 2H2O. Asbestos The board is made of 65% asbestos and 35% bonded material and is used primarily as a liner or insulation for equipment. Loss on asbestos board should not exceed 18%, longitudinal tensile strength should not be less than 1.4MPa. Asbestos board structure and thickness must be uniform, smooth surface, consistent cross-section, no scarring, pores and cracks. Asbestos board general specifications for the 1000 × 1000mm (thickness from 1.6 to 16mm), the weight of each 1mm thickness, weighing about 1.3kg / m2. The maximum temperature does not exceed 500 ℃.
(C) Calcium silicate insulation refractory products
Calcium silicate insulation refractory products is a calcium silicate hydrate as the main component of the insulation material. Industry is based on lime, silicic acid as raw material, autoclaved in the autoclave synthetic hydrated calcium silicate, and then appropriate to add asbestos and other fibrous materials, the pressure after the formation of the porous structure of the insulation products. calcium silicate insulation products provides the technical conditions of calcium silicate insulation products.

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The properties and uses of refractory corundum castable

Corundum castable is a refractory product with Al2O3 content of more than 90% and corundum as its main crystal phase. It is compounded with proper dispersing agent, coagulant, stainless steel fiber and compounded by strict formula It has the characteristics of high temperature, good strength, wear resistance, erosion resistance, high thermal conductivity, thermal shock resistance, corrosion resistance, good sealing, quick setting, etc.
Refractory corundum castable are widely used in circulating fluidized bed boiler, metallurgy, petrochemical, thermal power and other industries. Adding a certain proportion of steel fiber and admixture to the castable can produce steel fiber castable with good thermal stability and strong wear resistance, Corundum refractory castable used for heating furnace hearth, spout and parts of cement rotary kiln kiln etc.

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The properties and uses of refractory corundum castable
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