Joycelyn Zhao

19/08/2026

A workable logistics arrangement is not always a workable export arrangement.

A recent black silicon carbide order was a good reminder of this.

📦 The original arrangement

The customer chose to manage the export through their own logistics channel in China, with their appointed logistics provider responsible for the export customs declaration. The goods were therefore delivered to the designated warehouse.

⚠️ What happened

It was later determined that the original export arrangement could not support the compliance procedures and supporting documentation required for this shipment.

As a result, the goods remained at the warehouse longer than expected, and the trade arrangement had to be reorganized.

✅ How it was resolved

We subsequently reorganized the transaction under an export arrangement that could meet the applicable compliance requirements, including the necessary export license and supporting documentation.

The goods were then successfully exported.

💡 The takeaway

This experience reinforced an important point:

Different products can require very different export procedures, even when the logistics arrangement itself appears straightforward.

When an export involves product-specific requirements, it is worth confirming:

• Can the proposed export channel complete all the required procedures?
• What licensing, assessment or documentation requirements apply to the shipment?
• Which party will be responsible for completing them?

Confirming these details as part of the export arrangement can help avoid delays, additional warehousing, re-handling and unexpected costs.

A reliable supply solution is not only about producing the right goods.
It is also about making sure they can reach the customer.

07/05/2026

🔥 Lip Blocks for Solar Glass Furnaces — Why the “Best” Material Depends on Your Furnace

We recently received an inquiry from a solar glass producer looking for lip blocks with excellent thermal shock resistance.

At first glance, it sounded simple.

But after discussing their actual operating conditions, it became clear once again:

👉 There is NO universal “best” lip block material.
The right choice depends entirely on:
✔ Your furnace operation
✔ Glass chemistry
✔ Restart frequency
✔ Product quality requirements

In solar glass furnaces, lip blocks work at one of the most critical positions — the final outlet where molten glass flows continuously onto the rollers.

That means they must withstand:
🔥 Continuous high temperature
🔥 Glass melt erosion & abrasion
🔥 Thermal cycling during restarts and maintenance

And different producers prioritize completely different things.
📌 If your line restarts frequently:
Thermal shock resistance becomes critical.
Cracks during restart can immediately affect glass quality and production stability.
📌 If your glass chemistry is highly aggressive:
Corrosion resistance matters more.
The brick must maintain geometry over a long campaign.
📌 If you produce ultra-thin or high-transmission glass:
Purity becomes the top priority.
Even tiny inclusions from refractory erosion may appear in the final glass sheet.

So which material is usually selected?
🔹 Sintered Zircon-Mullite
Excellent thermal shock resistance + good erosion resistance.
Widely used in modern PV glass lines.
🔹 Fused Cast α-β Alumina (Corundum)
Extremely dense structure with outstanding corrosion resistance.
Ideal when chemical attack is the main concern.
🔹 High-Purity Mullite
Highest purity option for ultra-thin or electronic glass applications where contamination cannot be tolerated.

In this particular project, after evaluating the customer’s frequent roller changes and restart cycles, sintered zircon-mullite turned out to be the better fit — not because it is “better” universally, but because it matched THEIR operating reality.

That’s the key point in refractory selection:
✅ The best material is the one that matches the furnace conditions.

If you are working on lip block selection for solar glass furnaces, feel free to discuss with us. Happy to exchange ideas on operating conditions, material selection, and performance experience.

29/04/2026

Why Your Refractory Bricks Are Failing in a Hazardous Waste Rotary Kiln — A Real Case！

Recently, a client approached us with a challenging case:

“We’re using 75% alumina phosphate-bonded bricks in our rotary kiln incinerator, but they’re not working. Please suggest a suitable alternative.”

At first glance, this seems like a common refractory issue. But once we reviewed the operating conditions, the root cause became much clearer.

⚙️ Kiln Operating Conditions

Feed composition: 50% moisture · 20% sodium salts (NaCl + Na₂CO₃) · 30% organics · 2–3% chlorine
Operating temperature: 850–900°C
Kiln size: Ø2.8m × 8m
Shutdown frequency: approximately once per day

❗ The Pain Point
The existing 75% alumina phosphate-bonded bricks were failing rapidly.
The client even considered magnesia bricks as a last resort — based on literature they had reviewed.

🧪 What We Found
Thermal shock from daily start-stop cycles does play a role, especially in a rotary kiln where mechanical stress and torsion are unavoidable.
However, in this case, it was not the dominant failure mechanism.

👉 The primary driver was chemical attack
Under these conditions, sodium salts create a highly alkaline slag environment:
Phosphate-bonded alumina bricks contain silica
Sodium salts (NaCl / Na₂CO₃) react with silica
This forms low-melting sodium silicate phases
These phases pe*****te and weaken the brick matrix from within

👉 Thermal shock may accelerate the damage, but the root cause is chemical degradation

⚠️ Why Magnesia Wasn’t the Answer
Magnesia bricks are often recommended for high-temperature applications.
But not in this scenario:
❌ Poor thermal shock resistance in rotary kilns
❌ Reactivity with moisture and chlorine
❌ Susceptibility to mechanical stress during kiln rotation

👉 A material that performs well in general conditions may fail under specific chemical and operational environments.

🧱 Our Recommendation

👉 High-purity corundum bricks (>99% Al₂O₃, low silica)
Why corundum?
✅ Near-zero free silica → eliminates alkali-silica reactions
✅ Superior resistance to sodium salt corrosion at 850–900°C
✅ Good thermal shock resistance for cyclic operation
✅ Proven performance in chlorine-bearing, high-moisture environments

🧠 Final Insight
The right refractory is not:
The cheapest
The most commonly used
Or even the most cited in literature

👉 It’s the one that matches your chemistry, temperature, and operating cycle

At Rongsheng Refractory, we don’t just supply materials — we help solve high-temperature challenges in real operating conditions.

💬 Let’s Discuss

What’s your experience with hazardous waste kiln linings?
Have you encountered alkali-related failures?
Share your insights in the comments 👇

31/12/2025

🎬 Rongsheng Refractories | EPC Turnkey Refractory Project Highlight

We are proud to share a glimpse of Rongsheng Group’s EPC turnkey refractory project for the aluminum calcining furnace at Nanshan Aluminum Indonesia

This project covers a fully integrated solution, including:
✔ Refractory material supply
✔ On-site refractory installation
✔ Construction management and technical support

From engineering design to final ex*****on, our team delivered a one-stop refractory and construction solution, ensuring high-temperature performance, reliability, and long-term operational stability for aluminum calcination processes.

At Rongsheng Group, we are committed to supporting global industrial clients with complete refractory EPC capabilities, combining materials expertise with professional construction ex*****on.

📍 Project Location: Indonesia
🏭 Application: Aluminum Calcining Furnace
🔧 Scope: Refractory materials + installation (EPC)

We look forward to supporting more high-temperature industrial projects worldwide.

19/12/2025

In kiln construction, quality is not checked at the end — it is built into every second of the process 🔥

We don’t rely on fixed recipes alone.
Dry mixing duration, water-to-material ratio, wet mixing time, and even on-site temperature and humidity are adjusted in real time to match actual working conditions—because refractory performance is shaped as much on site as it is in the factory.

During casting, compaction is not judged by numbers only.
When the vibrating rod enters the cast body, our engineers listen.
The sound, together with the response of the slurry surface, tells us whether the lining has reached true density—before any defect can form.

This combination of material science, field experience, and sensory judgment is what allows us to achieve seamless bonding and consistently bubble-free, void-free linings.

As both a refractory materials manufacturer and a kiln lining engineering contractor, we design materials to perform—and install them to last.

Interested in how disciplined installation translates into longer campaign life and more stable kiln operation? Let’s connect.

15/09/2025

Ever wondered how sintered refractory bricks are shaped under pressure? 🏭💪

At our factory, we leverage a diverse range of pressing technologies to meet complex product requirements:
✅ 1250-ton Programmable Screw Press – Ideal for extra-large, high-density bricks.
✅ 630-ton Programmable Screw Press – Specialized for producing premium refractory products, such as high-purity corundum bricks.
✅ 500-ton Hydraulic Vibration Press – Perfect for intricate brick shapes that cannot be formed with impact presses.

Each machine ensures precision, durability, and consistency—key to excellence in refractory solutions.

Watch the video to see the powerful presses in action! 👇

15/09/2025

🌐 Join Us at Metal-Expo 2025 in St. Petersburg! 🌐

We are thrilled to announce that RONGSHENG GROUP – through Zhengzhou Rongsheng Refractory Co., Limited (RSNC) – will also be exhibiting at the 31st International Industrial Exhibition Metal-Expo’ 2025 in Russia!

📅 Date: November 11–14, 2025
📍 Location: St. Petersburg International Exhibition Center
🏢 Booth: Hall H, Stand No. 5B14-1

Come visit us to explore our high-quality refractory products tailored for the iron, steel, and metallurgical industries, including:

✔ Refractory bricks and castables
✔ Insulation materials and ceramic fiber products
✔ Custom refractory linings for various industrial furnaces, ladles, converters, and more

Our experts will be on hand to discuss how our solutions can help improve your productivity, extend equipment life, and withstand extreme conditions.

We look forward to connecting with existing and potential partners from across the globe!

🔗 Explore our product range: www.rsref.com
📩 Contact us for more info: [email protected]

02/09/2025

🌐 Join Us at Metal Expo 2025! 🌐

We are excited to announce that RONGSHENG GROUP – through Zhengzhou Rongsheng Refractory Co., Limited (RSNC) – will be exhibiting at METAL EXPO 2025, the International Iron, Steel, Metal-Products & Production Technologies Fair!

📅 Date: September 24–27, 2025
📍 Location: Istanbul Expo Center (Istanbul Fuar Merkezi)
🏢 Booth: Hall 4, No. 4A-31

Visit us to discover our high-performance refractory solutions designed for the iron, steel, and metal industries, including:

✔ Refractory bricks and castables
✔ Insulation materials and ceramic fiber products
✔ Advanced refractory linings for different kinds of furnaces, such like ladles, converters,etc

Our team looks forward to discussing how our refractory products can enhance your operational efficiency, reduce downtime, and withstand extreme temperatures.

Let’s connect and explore opportunities together! We’re eager to meet partners and clients from around the world.

🔗 Learn more about our products: www.rsref.com
📩Questions? DM us or email: [email protected].

01/09/2025

🚀 Inside Rongsheng Kiln Engineering’s Project No. 3

We're proud to showcase our No.3 kiln project featuring:
✅ Proprietary furnace design,6+ years refractory lifespan (field-proven)
✅ 10% thermal efficiency improvement & 8% heat loss reduction
✅ CE, ISO 9001, and SGS certifications ensuring top-tier quality
✅ 15% ahead-of-schedule progress with triple-quality assurance

For 12 years, Rongsheng has delivered 500+ kiln engineering solutions worldwide, combining rigorous industrial standards with sustainable innovation.

If you are facing challenges in kiln engineering, we welcome you to contact us to explore tailored solutions together.

23/07/2025

Sandblasting is a crucial process in various industrial applications, and selecting the appropriate abrasive material is essential for achieving the desired surface finish, optimizing efficiency, and meeting environmental and cost considerations. This article will explore choosing the right abrasive for your specific needs.

1️⃣ Quartz Sand
2️⃣ Steel Grit/Steel Shot
3️⃣ Garnet Sand
4️⃣ Silicon Carbide (Carborundum)
5️⃣ Brown White Fused Alumina
6️⃣ Glass Beads
7️⃣ Ceramic Beads(zirconia-based or alumina-based)
8️⃣ Copper Slag

💬 Let's discuss: What's been your most challenging sandblasting project? Share your experiences!

Sandblasting is a crucial process in various industrial applications, and selecting the appropriate abrasive material is essential for achieving the desired surface finish, optimizing efficiency, and meeting environmental and cost considerations. This article will explore choosing the right abrasive...