Tag: refractory cement

Aluminate Cement and Aluminate Refractory Castable

KilnRefractory

Aluminate cement and aluminate refractory castables. aluminate cement (Al2O3 65～70%, CaO 21～24% low iron type). RS Kiln Refractory Manufacturer is a refractory material manufacturer with rich production and sales experience. RS manufacturer is committed to providing high-quality and long-life refractory lining materials for high-temperature industrial furnaces. Contact Rongsheng for a free quote.

Rongsheng Calcium Aluminate Cement - High Alumina Cement
Rongsheng Calcium Aluminate Cement – High Alumina Cement

Aluminate Cement

Aluminate cement is a refractory cement, which has many names: refractory cement, 625 cement, high alumina cement, CA-50 cement, etc. It has a wide range of applications. In many refractory concretes, aluminate cement is an indispensable refractory binder.

Aluminate cement is a special cement with weak alkaline calcium aluminate as the main component. It is a hydraulic cementitious material made of bauxite and limestone as raw materials, calcined and made of clinker with calcium aluminate as the main component and about 50% alumina content.

The use temperature of aluminate cement can reach 1350℃. If it is mixed with high-alumina aggregate and other refractory materials in proportion to form a refractory castable, the refractory temperature can reach 1700℃.

Aluminate cement can be divided into CA-50 and CA-70 (also called calcium aluminate cement, white) according to the aluminum content. It is a hydraulic cementitious material with fast hardening, early strength, corrosion resistance and high temperature resistance. Aluminate cement is yellow-brown or gray and is widely used in metallurgy, machinery, building materials, petrochemicals, electricity, food and other industries.

Introduction to the uses of aluminate cement

  1. Used to prepare refractory castables and kiln linings.
  2. Suitable for projects that resist sulfate erosion.
  3. Suitable for concrete projects that require rapid hardening and emergency repair projects.
  4. Suitable for winter construction and special projects that require early strength.
  5. Used as raw material for making water purifiers (calcium aluminate powder).
  6. Used as the best raw material for making decorative materials (such as artificial marble, colored road tiles, colored corrugated tiles, etc.).
  7. It is an important component for preparing expansive cement, self-stressed cement and other special cements.
Rongsheng High Alumina Castables Refractory
Rongsheng High Alumina Castables Refractory

Aluminate Refractory Castables

Aluminate Refractory Castables are an important amorphous refractory material, widely used in industrial kilns such as metallurgy, building materials, petrochemicals, and electric power. It consists of refractory aggregate, powder and binder (such as aluminate cement), which is mixed by adding water or other liquids and has good construction performance and high temperature performance.

Aluminate Refractory Castables Aluminate cement is the key binder in aluminate refractory castables. The type and amount of aluminate cement have a significant effect on the performance of the castable. For example, an increase in the amount of CA-50 cement will increase the compressive strength at room temperature, but the compressive strength will decrease after burning at 1200℃, the refractoriness and load softening temperature will also decrease, and the linear shrinkage after burning will also increase. When preparing aluminate refractory castables, in addition to the amount of cement, the amount of water is also a key factor. An increase in the amount of water will lead to a decrease in performance, so the amount of water in the mixture should be minimized to ensure construction and workability. The selection of refractory powder and aggregate will also have an important impact on the performance of castables. Refractory powder can improve the refractory performance of castables, while the type, grade, maximum particle size and particle grading of aggregates are the main factors affecting the performance.

The use of aluminate castable admixtures is also an important means to improve the performance of aluminate refractory castables. Water reducers can improve the fluidity of castables and reduce water consumption, and coagulants and retarders can adjust the setting time of castables. Sintering agents and expansion agents can improve the medium-temperature strength of castables and compensate for shrinkage at high temperatures.

Effect of Barite Powder on the Strength of High Alumina Cement – High Temperature Cement

KilnRefractory

High alumina cement, also known as aluminate cement, has the advantages of high early strength, high-temperature resistance, and strong resistance to sulfate corrosion. In recent years, due to the rapid growth of the early strength of high alumina cement, early de-moulding, and tight construction schedules, the number of projects using high alumina cement to prepare concrete has continued to increase. However, the later strength of high alumina cement is unstable, and there is great controversy about its application in engineering. Studies have shown that the use of ultrafine powder as a mixture of high alumina cement can improve the later strength of high alumina cement.

Castable Refractory Cement
Rongsheng Castable Refractory Cement

Effect of Barite Powder on the Strength of High Alumina Cement

Baryte powder, commonly known as barite, is a naturally formed white inorganic salt and a neutral filler. Its relative density is 4.16, and it has the characteristics of light resistance and corrosion resistance, low oil absorption value, opaque to ultraviolet rays and X-rays, and radiation protection. Using natural mineral barite as an additive for aluminate cement can reduce the water requirement of the standard consistency of aluminate cement, improve the strength of cement, reduce the later strength regression, and not reduce the refractoriness of cement.

Adding an appropriate amount of barite powder admixture to high alumina cement can not only improve the early strength of high alumina cement but also inhibit the later strength shrinkage of high alumina cement. The appropriate amount of barite powder can promote the hydration of high alumina cement. The main reason why barite powder inhibits the later strength shrinkage of high alumina cement is that it inhibits the crystal transformation of CAH10 and C2AH8 to C3AH6 in the hydration products of high alumina cement. It should be noted that excessive addition of barite powder may cause the strength of high alumina cement to decrease. Therefore, in practical applications, it is necessary to make adjustments according to specific circumstances.

In general, the effect of barite powder on the strength of high-aluminum cement is a complex issue that requires comprehensive consideration of multiple factors. Future research can further explore the optimal addition amount of barite powder and the differences between different types of high-aluminum cement to better play the application value of barite powder in high-aluminum cement.

What is High-Temperature Resistant Cement? Aluminate, High Aluminum, Refractory

Rongsheng refractory cement sales. Rongsheng high-temperature cement, has many aliases, aluminate cement, high aluminum cement, high strength refractory high temperature resistant cement. It is a special cement that maintains good performance in high-temperature environment. It has high compressive strength, heat resistance, chemical corrosion resistance and low thermal expansion coefficient. It is suitable for engineering projects in harsh environments such as slag, high-temperature gas and chemically corrosive substances. Contact Rongsheng for a free quote.

Rongsheng Calcium Aluminate Cement - High Alumina Cement
Rongsheng Calcium Aluminate Cement – High Alumina Cement

High-temperature resistant cement is mainly used in high-temperature industrial fields such as metallurgy, petrochemical, and electric power. As well as the construction and maintenance of high temperature facilities such as furnaces, chimneys, smelting furnaces, and chemical equipment. Rongsheng high-temperature resistant cement, aluminate cement, refractory cement, high aluminum cement.

The main characteristics of high-temperature resistant cement are as follows:

  1. High-temperature resistance. The sintering temperature of high-temperature resistant cement is as high as 1300-1600 degrees Celsius. It can maintain stable performance in a long-term high-temperature environment and is suitable for various high-temperature facilities and equipment.
  2. High compressive strength. High-temperature cement has high compressive strength, can withstand large mechanical loads, and is suitable for high-strength and high-pressure engineering applications.
  3. Good chemical corrosion resistance. High-temperature resistant cement has good corrosion resistance to a variety of acid, alkali, salt and other chemical media, and can maintain a long service life in harsh chemical environments.
  4. Low thermal expansion coefficient. High-temperature-resistant cement has a low thermal expansion coefficient, can adapt to thermal expansion and contraction in high-temperature environments, and reduces the generation of cracks.
  5. Excellent fire resistance. High temperature-resistant cement has good fire resistance, can effectively prevent the spread of fire, and improves the fire safety performance of buildings.

Detailed Explanation of Ingredients and Process of High-Strength Sulphoaluminate Cement

Take the production of 100 kg of high-strength sulphoaluminate cement as an example. Among them, sulphoaluminate cement clinker: 76 kg; silica fume: 9 kg; dihydrate gypsum: 10 kg; lithium carbonate 1 kg, calcium hydroxide 2 kg and aluminum sulfate 1.5 kg; retarder: 0.5 kg. Weigh the raw materials of each component according to the above mass percentage. After mixing evenly, grind them together to a fineness of 360m2/kg specific surface area to make a finished cement product.

Sulphoaluminate cement. The high-strength sulphoaluminate cement produced by this method has a simple production process, is easy to implement and has low cost. It can effectively adjust the setting time of sulphoaluminate cement to meet the construction requirements of actual projects.

Rongsheng High Alumina Cement Manufacturer

Rongsheng Refractory Material Manufacturer is a powerful manufacturer and seller of refractory materials. Rongsheng’s high alumina cement (CA50/CA60/CA70/CA80, etc.). High temperature resistance and excellent performance. Rongsheng’s refractory products have been sold to more than 120 countries around the world, such as South Africa, Chile, Egypt, Colombia, Uzbekistan, Italy, Indonesia, Ukraine, Hungary, Spain, Kenya, Syria, Zambia, Oman, Venezuela, India, Peru, the United States, Ethiopia, etc. Contact Rongsheng for more information on refractory lining materials.

The Difference Between Refractory Mortar and Refractory Cement

KilnRefractory

In the process of building refractory bricks lining, for those who do not know much about refractory materials, the difference between refractory mortar and refractory cement is difficult to distinguish. When should I choose refractory cement and refractory mortar? The technical staff of Rongsheng refractory manufacturer gave the following explanation.

Refractory Mortar for Sale in RS Manufacturer
Refractory Mortar for Sale in RS Manufacturer

The furnace lining material can be made of refractory bricks or directly cast by refractory castables.

When building refractory brick lining, the special joint material or bonding material needed is refractory mortar.

Because the refractory bricks are piece by piece, the complete refractory lining material requires that the refractory bricks are to be tightly linked together and not fall off. Therefore, a kind of binder is used when refractory bricks are used for kiln linings building. This kind of binder is called refractory mortar or seam material. They are refractory slurries reconciled with refractory mortar and water. It is the main auxiliary material for refractory brick masonry and the seam filler for the bonding of refractory bricks.

The choice of refractory mortar material needs to be selected strictly in accordance with the material of the refractory brick used in the construction of the refractory lining. Do not mix! There are as many types of refractory bricks as there are refractory mortar materials. Commonly, high alumina refractory mortar is used for masonry high alumina bricks, magnesium refractory mortar is sampled for masonry magnesiate bricks, and silica refractory mortar is used for masonry silicon bricks.

Refractory Brick Lining Building
Refractory Brick Lining Building

How to use refractory mortar

The supply method of refractory mortar is supplied as dry powder. When used, it is mixed with liquid gelling agent to form a viscous slurry. This kind of mortar is collectively called high temperature refractory mortar, high temperature refractory mud or high temperature binder. According to the combination method of liquid gelling agent, it is divided into: water glass combined refractory mortar, phosphoric acid combined refractory mortar, aluminum phosphate combined refractory mortar, etc. In addition to being used as a bonding material, refractory mortar can also be used as a protective coating for furnace linings by smearing or spraying.

The refractory lining material can also be completed by painting, spraying and pouring.

When the refractory castable is casting, a binder is needed to bond the refractory feedstock together. So that the refractory lining material can be firmly fixed on the lining of thermal equipment. The binder used here is generally refractory cement.

Refractory cement, also called aluminate cement or high alumina cement. Aluminate cement is often yellow or brown, and sometimes gray. The main mineral composition of aluminate cement is calcium aluminate (CaO · Al2O3, CA), other aluminates, and a small amount of dicalcium silicate (2CaO · SiO2). Refractory cement forms eutectics under the action of high temperature. When configuring refractory castables, excessive addition will reduce the high-temperature performance of the castables, usually using silica powder to replace part of the refractory cement.

Furnace Lining Castable Refractory
Furnace Lining Castable Refractory 

In Conclusion

The biggest difference between refractory mortar and refractory cement is that refractory mortar is used for refractory bricks (mixed with water or other liquids). The refractory cement is used as a binder material for various refractory aggregates, and the refractory castables made of it are used as lining materials for kilns.