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Henan Hongke Heavy Machinery Co., Ltd. recently completed a 400-ton-per-day lime rotary kiln project in Yinchuan, Ningxia. The system is now up and running, delivering consistent output. Here's the story.
The Situation: Local Demand Was Growing
Ningxia's steel, calcium carbide, and chemical industries were expanding fast. They all need high-quality active lime—but local supply couldn't keep up. Our customer, a major industrial player in Yinchuan, decided to fix that.
They needed a reliable, large-scale kiln that could produce 400 tons per day of top-quality lime, run 24/7, and meet strict environmental rules. No shortcuts.
What We Supplied
We designed and built a complete lime production line around a Φ3.5×75m rotary kiln.
| Key Spec | Value |
|---|---|
| Diameter | 3.5 m |
| Length | 75 m |
| Capacity | 400 tons/day |
| Operating temp | Up to 1,250°C |
| Drive | Heavy-duty gear + backup motor |
The full system includes:
Vertical preheater – captures waste heat, preheats stone to ~900°C, cuts fuel use by ~30%
Φ3.5×75m kiln – main calcination unit with high-alumina refractory lining
Vertical cooler – quenches lime fast, preserves reactivity, recovers heat
Multi-channel burner – runs on coal powder or natural gas
Dust collector – cyclone + bag filter, emissions under 30 mg/Nm³
DCS controls – monitors everything automatically
How It Works
| Stage | What Happens |
|---|---|
| Preheat | Limestone heated to ~900°C using waste gas |
| Calcination | 1,100–1,250°C in the kiln – limestone turns to lime |
| Cooling | Lime quenched from 1,100°C to <100°C – locks in reactivity |
| Dust control | Gases cleaned before they leave the stack |
What the Customer Gets
| Benefit | Impact |
|---|---|
| 400 tons/day capacity | Meets local demand consistently |
| High reactivity lime (≥340 ml) | Works for steelmaking and chemicals |
| ~30% fuel savings | Preheater cuts operating costs |
| 24/7 reliability | >92% uptime |
| Clean operation | Emissions under 30 mg/Nm³ |
| Fuel flexibility | Can switch between coal and gas |
Who We Are
Henan Hongke Heavy Machinery Co., Ltd. has been building rotary kilns, rotary dryers, ball mills, and crushers since 2006. We design, manufacture, and support equipment worldwide.
Bottom Line
This 400 TPD lime kiln is now in full operation—producing high-quality lime for Ningxia's growing industries, with lower fuel costs and clean emissions.
Need a large-scale lime kiln? Talk to us.
Contact Henan Hongke Heavy Machinery Co., Ltd. – we deliver equipment that works.
Henan Hongke Heavy Machinery Co., Ltd.
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