Henan Hongke Heavy Machinery Co., Ltd. is pleased to report that our Φ3.5×75m lime rotary kiln production line — designed for 400 tons per day of active lime — has reached the site construction phase in Ningxia, China. This project demonstrates our capability to deliver large-scale, engineered lime calcination systems for the metallurgical and industrial markets.
Project Overview: Ningxia's Growing Lime Demand
Ningxia Hui Autonomous Region, located in northwestern China, has emerged as a significant hub for heavy industry, including steel production, calcium carbide manufacturing, and coal chemical processing. These industries share a common need: high-quality active lime (quicklime) for fluxing, chemical reactions, and environmental treatment.
Our client, a major industrial operator in the region, identified a gap in the local lime supply chain. With existing kilns unable to meet the quality and volume requirements of downstream users, they turned to Henan Hongke Machinery for a complete rotary kiln solution.
The client's requirements were clear:
Capacity: 400 tons of active lime per day
Product quality: High reactivity (activity degree ≥ 340 ml), low residual CO₂
Fuel flexibility: Capability to fire pulverized coal or natural gas
Environmental compliance: Dust emissions below 30 mg/Nm³
Operational reliability: 24/7 continuous operation with > 92% annual uptime
The Equipment: Φ3.5×75m Rotary Kiln System
The heart of this production line is a Φ3.5m diameter by 75m long rotary kiln — a proven configuration for medium-to-large-scale lime production. Henan Hongke Machinery engineered the entire system with the following key components:
Rotary Kiln Specifications
| Parameter | Value |
|---|---|
| Diameter | 3.5 meters |
| Length | 75 meters |
| Capacity | 400 TPD active lime |
| Kiln inclination | 3.5–4% |
| Rotation speed | 0.5–3.5 rpm (variable frequency drive) |
| Operating temperature | Up to 1,250°C (burning zone) |
| Shell material | Q345R boiler-grade steel |
| Refractory lining | High-alumina brick + insulation layer |
Complete System Configuration
This project is a full production line — not just a kiln. Henan Hongke Machinery supplied the entire system including:
Vertical Preheater – Recovers waste heat from kiln exhaust gases, preheating limestone to ~900°C and completing 25–35% calcination before material enters the kiln. This design reduces overall fuel consumption by up to 40% compared to systems without preheaters.
Φ3.5×75m Rotary Kiln – The core calcination unit, where limestone (CaCO₃) is thermally decomposed into quicklime (CaO) and CO₂ at temperatures between 1,100°C and 1,250°C.
Vertical Cooler – Rapidly cools the hot lime product from ~1,100°C to below 100°C, preserving high reactivity. The recovered hot air is recycled to the kiln as secondary combustion air, further improving thermal efficiency.
Multi-channel Burner – Provides precise flame control and fuel flexibility (coal powder, natural gas, or mixed fuels).
Dust Collection System – Multi-stage treatment including cyclone pre-separator and pulse-jet bag filter, achieving outlet dust concentrations consistently below 30 mg/Nm³.
Automation & Control – DCS-based centralized control system monitoring temperature, pressure, material flow, and emissions in real time.
Current Status: Site Construction Underway
As of the latest update, the Ningxia project has entered the on-site construction phase. Key milestones achieved include:
Equipment Manufacturing: All major components — including the kiln shell segments, preheater, cooler, and drive system — have been fabricated at Henan Hongke Machinery's 50,000m² manufacturing facility.
Foundation Work: Civil engineering and foundation preparation at the Ningxia site are substantially complete, ready for equipment placement.
On-site Assembly: Installation of the kiln supporting rollers and thrust roller assembly has commenced, with kiln shell alignment and welding scheduled to follow.
Engineering Support: Henan Hongke Machinery has dispatched an experienced installation supervision team to oversee the assembly, alignment, and commissioning process.
Why This Project Matters
For the Client
Once operational, this 400 TPD lime production line will deliver:
High-quality product meeting steelmaking and chemical industry specifications
Lower operating costs through the preheater's energy recovery system
Reliable 24/7 operation backed by heavy-duty design and automation
Environmental compliance with China's increasingly stringent emission standards
For Ningxia's Industrial Ecosystem
The region's steel, calcium carbide, and coal chemical industries will benefit from a stable, local supply of high-quality active lime — reducing transportation costs and supply chain risks compared to sourcing from distant provinces.
About Henan Hongke Heavy Machinery Co., Ltd.
Henan Hongke Heavy Machinery Co., Ltd. (Henan Hongke Machinery) is a leading Chinese manufacturer of industrial rotary equipment, with over a decade of experience in designing and building:
Rotary Kilns – for lime, cement, metallurgy, and mineral processing
Rotary Dryers – for sludge, biomass, and industrial materials
Ball Mills – for grinding ore, cement, and chemicals
Crushers – for primary and secondary size reduction
Our capabilities include full in-house engineering, precision manufacturing, turnkey project delivery, and comprehensive after-sales support. With installations across China and in international markets, Henan Hongke Machinery brings proven expertise to every project.
Looking Ahead: Commissioning and Startup
Following the current site construction phase, the Ningxia 400 TPD lime rotary kiln line will proceed through:
Equipment installation completion – All components positioned and secured
Refractory installation – Kiln lining and preheater brickwork
System integration – Connecting material handling, gas flow, and control systems
Cold commissioning – Testing all mechanical and electrical systems without material
Hot commissioning – Trial production with limestone feed, parameter optimization
Performance testing – Verification of capacity, product quality, and emission targets
Henan Hongke Machinery will remain on-site through commissioning to ensure the system meets all design specifications.
Need a Similar Solution?
If you're planning a lime, cement, or mineral calcination project — or need a complete rotary kiln system engineered for your specific material and production targets — contact Henan Hongke Heavy Machinery Co., Ltd.
We don't just sell equipment. We deliver engineered solutions that perform.
Henan Hongke Heavy Machinery Co., Ltd.
Rotary Kilns | Dryers | Ball Mills | Crushers – Engineered for Real-World Results