Refractory Cement
Refractory Cement ＆ Porland Cement
Refractory cement, also called calcium aluminate cement (high-alumina cement), is a special high-temperature binder for refractory castables. As a hydraulic high-temperature cementitious material, it is mainly composed of calcium aluminate. It is produced by calcining bauxite and limestone into clinker at high temperature and then grinding, with refractoriness ≥1580℃.
Portland cement is a general cementitious material for civil construction. The two have fundamental differences in raw materials, high-temperature resistance and application scenarios.
ZINFON, Authorized General Agent for
Imerys Jianai & Jinghua, Aluminate Cement
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![SECAR 71 Cement]()
SECAR 71 CementSECAR 71 is a water-hardening bonding agent with an aluminum oxide content of approximately 70%. It is suitable for high-temperature environments, withstanding temperatures exceeding 1400°C.read more -
![SECAR 68 Cement]()
SECAR 68 CementSECAR 68 refractory cement is a high-alumina CA60 cement. It is a water-hardening cementitious material whose main component is calcium aluminate, with an alumina content of approximately 60% to 68%.read more -
![JiaNai Refractory Cement CA80]()
JiaNai Refractory Cement CA80CA80 is an aluminate cement with approximately 80% alumina content, low impurity levels, and a balanced combination of CA phase (monocalcium aluminate) and CA₂ phase (dicalcium aluminate). It...read more -
![JiaNai Refractory Cement CA70]()
JiaNai Refractory Cement CA70CA-70 Aluminate Cement is a hydraulic binding agent with an alumina content of approximately 70%, respectively.read more -
![JiaNai Refractory Cement CA50]()
JiaNai Refractory Cement CA50Water-hardening binding agent with an alumina content of approximately 50%–60%. The main mineral phase is CA (calcium monoaluminate), and the secondary mineral phases include C12A7, C2AS, CT, and...read more -
![JingHua Calcium Aluminate Cement CA41 (Refractory Applications）]()
JingHua Calcium Aluminate Cement CA41 (Refractory Applica...Using CA 41 as a refractory cement normally finds it as the primary binder in mortars and concretes exposed to refractory temperatures. CA 41 is preferred by many for low duty refractory concretes...read more -
![JingHua Calcium Aluminate Cement CA40 (Refractory Applications）]()
JingHua Calcium Aluminate Cement CA40 (Refractory Applica...The principal components of CA 40 are calcium aluminates which make it an ideal binder for refractory applications. Its high monocalcium aluminate content yields refractory concrete with excellent...read more -
![JingHua Refractory Cement CA80]()
JingHua Refractory Cement CA80Calcium Aluminate Cement CA80 is a high-purity product with an alumina (Al₂O₃) content of more than 78%. It exhibits excellent early strength and high residual strength at medium temperatures. It...read more -
![JingHua Refractory Cement CA70]()
JingHua Refractory Cement CA70CA70 belongs to the high-purity calcium aluminate cement series, with an alumina (Al₂O₃) content of at least 68%. Its main mineral phases are monocalcium aluminate (CA) and dicalcium aluminate...read more -
![JingHua Refractory Cement CA50]()
JingHua Refractory Cement CA50Aluminate Cement A600 features rapid setting and hardening with concentrated heat release. It is primarily used in the preparation of traditional medium- and high-alumina cement castables, such as...read more -
![Aluminum Dihydrogen Phosphate]()
Aluminum Dihydrogen PhosphateAluminum dihydrogen phosphate - H2Al(PO4)2 is mainly used as a high-temperature binder in refractory materials to bond refractory aggregates (e.g., corundum, mullite, silicon carbide, etc.) into a...read more -
![Refractory Silica Fume]()
Refractory Silica FumeRefractory silica fume is an ultrafine powder material with high-purity amorphous silicon dioxide (SiO₂) as its main component.read more
Zinfon Cement Product Grade
CA40 CA41 CA50-A600 CA50-A700 CA50-A900 Secar 68 CA70 Secar 71 CA80
| Product Grade | Al₂O₃ | CaO Calcium Oxide | Main Features | Max Service Temperature |
|---|---|---|---|---|
| CA40 | ≥40% | Approx. 43% | Cost-effective, rapid strength development, for insulating castables & low-temperature refractory repair | 1100℃ |
| CA41 | ≥41% | Approx. 42% | Cost-effective, fast strength gain, designed for dry-mix repair mortars, grouts and construction chemical applications, equivalent to Imerys TERNAL Fondu | 1100℃ |
| CA50-A600 | ≥50% | Approx. 40% | General purpose, rapid hardening, high cost performance | 1200℃ |
| CA50-A700 | ≥50% | Approx. 40% | Better alkali resistance, widely used in cement kilns | 1300℃ |
| CA50-A900 | ≥50% | Approx. 40% | Superior retained strength at high temperature | 1400℃ |
| Secar 68 | ≈68% | ≈30% | Premium calcium aluminate cement, low impurity, outstanding rapid hardening property, good thermal stability for high-temperature construction systems | 1450℃ |
| CA70 | ≈70% | ≈28% | High purity, low impurities, excellent high-temperature performance | 1500℃ |
| Secar71 | ≈71% | ≈27% | International premium calcium aluminate cement with excellent stability | 1500℃ |
| CA80 | ≈80% | ≈18% | Ultra-high alumina content, excellent high temperature & corrosion resistance | 1600℃ |
Differences between Refractory Cement and Portland Cement
| Comparison Items | Refractory Cement (Calcium Aluminate Cement CAC) | Portland Cement OPC |
|---|---|---|
| Main Raw Materials | Calcined bauxite + limestone, Al₂O₃ content: 50%~80% | Limestone + clay + gypsum, Al₂O₃ only 3~6% |
| Mineral Phases | Calcium aluminate CA, dialuminate CA₂ (calcium aluminate system) | Tricalcium silicate C₃S, dicalcium silicate C₂S (calcium silicate system) |
| High Temperature Resistance | Long-term service at 1100~1600℃; forms ceramic bonding after high-temperature dehydration with stable retained strength | Strength starts to decline above 300℃; structure collapses and pulverizes over 600℃. Never for kiln lining |
| Strength Development | Ultra-rapid hardening: 1-day strength reaches 80% of final strength, full strength achieved in 3 days | Strength grows slowly and continuously, reaching design strength at 28 days; stable long-term strength, suitable for load-bearing building structures |
| Hydration Products | No free calcium hydroxide Ca(OH)₂ after hydration | Generates large amount of calcium hydroxide upon hydration, vulnerable to acid and sulfate attack |
| Corrosion Resistance | Good resistance to sulfate and weak acid corrosion, suitable for kiln alkali / sulfur atmosphere | Poor chemical corrosion resistance, easily corroded by kiln alkali and sulfides |
| Appearance | Mostly yellowish-brown and tan (CA70 tends to off-white) | Grayish white |
| Main Applications | Refractory castables, kiln lining, high-temperature equipment repair, refractory mortar (rotary kilns, boilers, incinerators) | Houses, bridges, roads, ordinary building concrete structures |
Refractory Cement Applications
Hydraulic Bonding at Ambient Temperature Enables Rapid Construction & Forming
Refractory cement undergoes rapid hydration reaction once mixed with water. It hardens quickly at room temperature, firmly bonding all types of refractory aggregates and refractory powders and developing early strength rapidly. Complicated curing conditions are not required. It can cure and form normally even under low-temperature environments, effectively shortening the construction, demoulding and maintenance period. Suitable for construction scenarios such as rapid kiln repair, on-site monolithic casting and precast refractory component fabrication, greatly improving construction efficiency.
High-Temperature Ceramic Bonding Ensures Stability Under High-Temperature Service
After the material is put into high-temperature service, the previous hydration products will undergo stable phase transformation, generating dense and robust aluminate ceramic crystal phases to form a high-strength ceramic bonded structure. It breaks the limitation of room-temperature bonding. It will not powder or collapse and maintains stable strength under 1200–1600℃ high-temperature conditions. It can effectively resist high-temperature burning, thermal expansion & contraction and thermal shock, preserving the structural integrity of kiln lining for long-term service. Widely applied in core high-temperature zones such as cement rotary kilns, metallurgical heating furnaces, circulating fluidized bed boilers and high-temperature incinerators.
Anti-Corrosion Protection Extends Service Life of Kiln Lining
No free calcium hydroxide is generated during the hydration of refractory cement, fundamentally avoiding the vulnerability to corrosion of ordinary cement. It can efficiently resist chemical attack from alkali vapors, sulfates, acid flue gas and molten dust inside kilns. It effectively mitigates cracking, peeling, spalling and damage of materials under high-temperature service, forming a long-term protective layer for kiln lining. It greatly reduces equipment maintenance frequency and remarkably extends the overall service life of refractory linings. Especially suitable for heavily corrosive working conditions including cement kiln transition zone, kiln outlet, hazardous waste incinerators and chemical high-temperature reactors.
Precautions for Baking Refractory Cement Lining
(1) In the temperature range from ambient temperature to 350℃, local spalling is most likely to occur. Special attention shall be paid to slow baking. If a large amount of steam still escapes after holding at 350℃, the heating rate shall be further reduced.
(2) When ventilation is poor and water vapor is difficult to discharge, the holding time shall be appropriately extended.
(3) When using heavy oil for baking, strictly prevent heavy oil from spraying onto the lining surface to avoid local spalling.
(4) When using firewood for baking, areas in direct contact with flame tend to heat up too rapidly locally and shall be protected.
(5) Newly cast refractory cement can only be baked after at least 3 days of curing.
(6) The cooling of refractory cement lining shall also be slow, and forced ventilation shall be avoided.
Precautions for the Use of Refractory Cement
Proper construction is the key to preventing cracking and spalling. The following points should be noted:
Mixing Ratio & Stirring: Strictly control the water-cement ratio. Appropriate refractory aggregates (such as corundum and calcined high-alumina bauxite) can be added to enhance performance. Do not use it by simply mixing with water only.
Curing Environment: Keep the surface moist within 24 hours after construction (by water spraying or covering with wet cloth). Avoid direct sunlight or strong wind. The recommended curing temperature ranges from 5℃ to 30℃.
Baking Procedure: Low-temperature baking (100~300℃ for 24~48 hours) is required after curing to remove moisture. Increase the temperature gradually (50~100℃ per hour). Rapid heating or cooling is strictly prohibited.
Prohibitions: Do not mix with ordinary cement, refractory clay or other materials. The thickness of single casting should not be excessive (<10 cm), to prevent cracking caused by thermal stress.
Transportation, Storage and Shelf Life of Refractory Cement
Aluminate cement must be strictly protected from moisture during transportation and storage to prevent performance degradation. Throughout transportation, storage and usage, contact with silicate cement, other types of cement, lime and other harmful impurities is strictly prohibited. The product shall be stored in a dry environment and kept off the ground. Under standard storage conditions, product performance remains stable for at least 2 months. When stored in favorable conditions, its properties can be maintained unchanged for 3 months.
Pure water shall be used for mixing to avoid impurities affecting application performance. When properly stored off the ground in dry conditions, the minimum shelf life of this product is 6 months. With proper custody, its performance can be retained for 1 year.
ZINFON Export Packaging for Refractory Cement
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