In advanced explosion proof refractory castables, the use of composite ultrafine powders and high-efficiency additives can sometimes lead to excessive densification of the castable lining, making it difficult for bound water to escape. As a result, internal vapor pressure may build up during heating, increasing the risk of cracking.
To address this issue, Shandong Haixin Refractory Materials has developed a series of explosion proof castables. These products incorporate fast-drying agents and explosion proof fibers that create an open microporous structure within the lining, allowing water vapor to escape smoothly during heating. After standard curing and a shortened baking process, the lining can be quickly put into service. This makes the material particularly suitable for high-temperature applications where construction schedules are tight or furnace drying conditions are limited.
Explosion proof refractory castables are characterized by fast setting and significantly reduced furnace drying time. They are typically based on low cement castable formulations with the addition of high-efficiency accelerators and explosion proof fibers. The CaO content is generally controlled below 2.0%, which helps reduce water demand and improves drying performance. Under normal conditions, the castable lining can be put into operation after a furnace drying period of approximately 2–5 days.
These energy-efficient castables are specifically developed to shorten furnace drying time. Depending on furnace lining thickness and performance requirements, products with drying times of about 3–7 days are available. Compared with conventional castables that may require 12–21 days of furnace drying, explosion proof castables can significantly reduce drying time, improve construction efficiency, and lower overall energy consumption, making them widely favored by users.
|
Project |
HX-KG55 |
HX-KG60 |
HX-KG65 |
HX-KG70 |
|
|
Chemical Composition (%)：≥ |
Al2O3 |
55 |
60 |
65 |
68 |
|
Bulk Density (g/cm3) |
110℃×16h |
2.25 |
2.35 |
2.40 |
2.40 |
|
Compressive Strength (MPa)：≥ |
110℃×16h |
40 |
45 |
50 |
50 |
|
1350℃×3h |
60 |
65 |
70 |
65 |
|
|
Flexural Strength (MPa)：≥ |
110℃×16h |
7 |
7 |
7 |
7 |
|
1350℃×3h |
10 |
10 |
10 |
10 |
|
|
Linear Rate of Change (%) |
1350℃×3h |
-0.5~+0.5 |
-0.5~+0.5 |
-0.5~+0.5 |
-0.5~+0.5 |
|
Long-term Operating Temperature (℃) |
1350 |
1350 |
1350 |
1350 |
|
Explosion proof refractory castables are mainly used in:
Boiler furnaces and combustion chambers in the power industry
Preheaters and tertiary air ducts in the cement industry
Heating furnaces and reactors in the petrochemical industry
Large-volume monolithic linings in the metallurgical industry
Drying furnaces and furnace areas exposed to rapid heating or steam explosion risk
Packaging:
Standard packaging includes 50 kg bags, ton bags, pallet packaging, or sealed packaging. Customized packaging is also available.
Storage:
Store in a dry and well-ventilated environment. The product maintains stable performance under proper storage conditions.
Q1: Can explosion proof refractory castables completely prevent cracking?
A: They can significantly reduce the risk of cracking caused by rapid heating and internal steam pressure. However, a proper furnace heating schedule should still be followed.
Q2: What is the difference between explosion proof castables and quick-drying explosion proof castables?
A: Quick-drying types focus on shortening the furnace drying cycle, while explosion proof castables primarily emphasize safety by preventing explosive spalling during heating.
Q3: Are there any special requirements during construction?
A: Yes. The amount of added water must be strictly controlled during mixing to avoid affecting the designed pore structure and steam-release performance.
Q4: Do you support customization according to furnace type?
A: Yes. Please provide information such as the furnace type, application location, maximum operating temperature, contact medium, furnace dimensions (or lining thickness), and preferred construction method. Our R&D team will optimize the formulation to meet your specific operating conditions.
Q5: Are explosion proof castables suitable for furnaces with frequent start-ups and shutdowns?
A: Yes. Their internal pore structure helps relieve thermal stress and reduces the risk of cracking during repeated heating and cooling cycles.
Q6: How dependent are explosion proof refractory castables on the furnace drying process?
A: The drying requirements are less strict than those of conventional castables. However, a proper heating curve is still recommended to ensure long-term stability of the lining.
Q7: Can you provide application cases or technical support?
A: Yes. Shandong Haixin can provide industry application experience and technical support, including guidance on construction and furnace drying procedures.
Q8: Do you support OEM/ODM cooperation?
A: Yes. We fully support OEM and ODM partnerships and can provide flexible solutions ranging from product customization to full supply-chain support according to customer requirements.
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