The types and functions of high temperature adhesives

High temperature adhesives are a type of bonding material that can maintain excellent adhesion at high temperatures. They can be used to connect refractory bricks with each other, for attaching lightweight insulation boards, and as a coating material for harsh inner linings.

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Which can be used more frequently of refractory brick and refractory castable for the inner lining of molten iron ladles?

whether using refractory bricks or refractory mortar, it depends on whether the production party has molds. If there are molds, aluminum-carbide-silicon refractory mortar can be used for the lining construction. If not, refractory bricks can be used for the lining.

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What causes the cracking of refractory mortars?

The problem of cracking of refractory mortars is a complex issue, but many factors are closely related, including production processes, raw materials, and binders. The main reason is related to the baking speed.

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How to make the insulation layer of the rotary kiln lining reasonably?

The materials for the rotary kiln lining have been constantly updated. It is no longer a simple one-mode lining. Currently, there are refractory brick linings, pure refractory castable overall linings, prefabricated pieces and castable materials each in half for lining, etc.

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What are the benefits of high-alumina bricks after impregnated with phosphoric acid?

Phosphating high-alumina bricks involves immersing the finished high-alumina bricks in a phosphoric acid solution for more than two hours in a certain container, followed by low-temperature treatment, which leads to significant improvements in their physical properties. This enables their use in demanding industrial furnaces.   After phosphating, ordinary high-alumina bricks, as reflected in actual tests, show a temperature softening point increase of over 30°C, a significant decrease in porosity of about 10%, an increase in volume density of 0.2 g/cm³, and a 1% decrease in the flexural strength of the phosphated high-alumina bricks. It is clearly evident that the indicators have improved.   Phosphated high-alumina bricks can enhance their physical properties while also improving their surface micro-roughness and internal structure, enabling neutral products to resist acidic and some alkaline atmosphere erosion.   After being soaked in a phosphoric acid solution for a reasonable period of time and treated at a specific temperature, the phosphoric acid solution penetrates the brick pores, filling some of the air holes and forming a micro-crack buffering structure, which can resist temperature sudden changes and reduce the peeling and cracking of the product under thermal stress impact.   The phosphating treatment of ordinary high-alumina bricks is...

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What factors affect the quality of low-cement castables?

The production process of this series of castables is quite strict, and there are many factors that affect the performance of low-cement castable, such as ultrafine powder, alumina cement and some other admixtures. In addition, the amount of water added, construction, and grilling are all factors that affect the quality of the castable.

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What causes the shrinkage of refractory castables at low temperatures？

In conclusion, as the seasons change, as a manufacturer of castable materials, it is necessary to make appropriate adjustments to the binder and not remain unchanged. It should be determined based on the actual situation to meet the requirements of use and construction.

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Why the price is different for high alumina bricks with same material?

The prices of high alumina bricks of the same material vary. This is mainly due to the differences in body density, shape, and quantity, which can cause significant price differences among refractory bricks of the same material.

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The differences between high alumina composite bricks and phosphate composite bricks

Both high alumina composite bricks and phosphate composite bricks belong to composite bricks, and the lightweight parts of the composite are both designed to protect the kiln skin. However, there are differences in service temperature and wear resistance between these two types of bricks.   1. Raw Materials and Production Processes High alumina composite and phosphate composite are both formed by dividing the material zone and then high-pressure molding, but their sintering methods are different. High alumina composite bricks are sintered at high temperatures, while phosphate bricks are sintered at low temperatures.   The raw materials for compounding are different: high-alumina compounding is a combination of bauxite and lightweight materials, while phosphate compounding is produced after black material and phosphoric acid solution are used as binders. Only light components are added at intervals during the molding process to optimize the compounding.   2. Performance Characteristics High alumina composites feature high-temperature resistance, high mechanical strength, and a relatively high load-softening temperature. Especially for the super-grade high alumina bricks with an aluminum content of over 80%, the load-softening temperature is even higher, and their service life is longer.   Phosphate composite materials have particularly excellent wear resistance, can withstand sudden temperature changes,...

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What’s refractory hollow balls?

Refractory hollow balls are important raw materials for making high-grade insulating refractory materials. Compared with ordinary insulation materials, refractory hollow sphere products have the characteristics of low density, numerous voids, few connections, high strength, high compressive load softening temperature and low re-firing linear shrinkage rate. The manufacturing methods of refractory hollow balls include electrochemical method and sintering method. The electric melting spheroidizing method involves melting refractory materials into a liquid state in an electric furnace and then blowing them out with compressed air to form hollow balls. The sintering method uses combustible materials as the core. The ball core is placed in the pelletizing disc. After adjusting the rotational speed of the pelletizing disc, the ball core is made to flip and roll inside the disc while adding a binder and dry powder of refractory raw materials. The ball core adsorbs the binder and is coated with dry powder to form a ball. Then, after drying and calcination, ceramic hollow balls are made. The hollow balls made by the powder coating forming process have the advantages of low bulk density, uniform and smooth sphere walls, high pelletizing rate, low cost, high efficiency and good performance. The commonly used hollow balls in refractory materials are made...

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How to identify defects in the production process of refractory bricks?

The main defects in the production process of refractory bricks are underburning, overburning, damage, contamination, core encirclement, distortion, cracking, etc.

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Classification of refractory clay

Refractory clay is the main raw material for the production of aluminosilicate refractory materials. All kinds of hard clay, soft clay, semi-soft clay and clay shale with a refractoriness requirement higher than 1580℃ are collectively referred to as refractory clay.

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