Sinotece

09/09/2026

Behind the equipment are people ready to work through your challenges with you.
When the aim is to increase output and reduce power consumption in a cement grinding system, the discussion often begins with very practical questions: How can the existing equipment be reused? How will new equipment work with the existing system? Can the design on paper be implemented on site?
Discussions beside the equipment, component measurements in the workshop, and drawing reviews at a desk—these scenes may not be glamorous, but they reveal an important part of engineering: clarifying the issues, checking the details, and making sure everyone involved shares a clear understanding of the next steps.
Take the energy-saving and carbon-reduction retrofit of the No. 1 cement mill at Tianhe in Jilin as an example. The project retains the existing Φ3.8 × 13 m cement mill and pairs it with an INRP180-160 roller press, upgrading the existing system rather than simply replacing all the original equipment.
The retrofit targets for the P.O42.5 cement grinding system are:

System output: 90 t/h → 250 t/h
System power consumption: 38 kWh/t → 25 kWh/t
Fineness requirement: 8% ± 1% residue on the 45 μm sieve, unchanged before and after the retrofit.

The figures describe the retrofit targets, while the conversations, measurements, and discussions in the photos remind us of the practical work behind them. How the equipment connects, how the drawings are interpreted, and which on-site details still need confirmation are all worth sitting down to discuss—and checking beside the equipment itself.
At SINOTECE, we value equipment and process technology, and we place equal importance on communication with our customers. We want to listen carefully to your concerns and understand the existing conditions before discussing, together, a retrofit approach suited to your production line.
What is your priority for your cement grinding system right now—higher output, lower power consumption, or better integration between new and existing equipment?
Share your thoughts in the comments, or send us a private message about your existing equipment configuration and the challenges you are facing. Let’s start with your actual operating conditions.
Contact us: [email protected]

04/09/2026

What does a raw mill actually do in a cement plant?
A raw mill system grinds proportioned raw materials—including limestone, clay and corrective materials—into a fine powder known as raw meal. During this process, the system can also dry the materials, separate fine particles from coarse ones, and return oversized particles for further grinding.

The finished raw meal is then sent to the homogenization silo before entering the preheater and kiln.

This is why a raw mill should not be viewed as just one grinding machine. It is a critical process system connecting raw material preparation with stable clinker production.

Learn more about SINOTECE cement process and raw material grinding solutions:
https://sinotece.com/process-technologies/production-line-processes/ -material-grinding-system

SINOTECE | Cement Process & Grinding Solutions

02/09/2026

Vertical Roller Mill: The Workhorse of Raw Meal Grinding
The vertical roller mill (VRM) is the workhorse of grinding systems in cement plants. It combines crushing, drying, grinding, classification and conveying in one vertical machine, making it the dominant equipment for raw meal grinding.
Why is grinding so important? It can account for around 70% of a cement plant’s electricity use. Raw meal fineness directly affects kiln burning performance and cement strength. As the most power-intensive stage, grinding—and the choice of mill—directly affects the plant’s electricity bill.
A conventional ball mill relies on steel-ball impact, with low energy utilization. A VRM works differently, and the difference is immediately visible:
Ball Mill vs Vertical Roller Mill (VRM)

⚙️ Grinding principle
Ball Mill — Steel-ball impact; single-particle breakage
VRM — Material-bed compression; interparticle comminution

⚡ Mill-specific power consumption
Ball Mill — Baseline
VRM — 30–40% lower; about 15–17 kWh/t for raw meal

📐 System footprint
Ball Mill — Baseline
VRM — About 50% of a ball mill system; outdoor installation is possible

♨️ Drying capacity
Ball Mill — Separate dryer required
VRM — Direct hot-gas drying in the mill; handles feed with up to 20% moisture

🔄 Classification
Ball Mill — External separator
VRM — Integrated dynamic separator; more compact system

VRM Features
1. Lower power consumption At the same output, a VRM saves 30–40% power versus a ball mill system. It uses compression, not impact, so almost all energy goes into comminution.
2. Smaller footprint and lower cost A VRM system occupies about half the area of a ball mill system, can be installed outdoors, and significantly reduces civil construction investment.
3. Easier operation and maintenance The material bed cushions the grinding rollers and grinding table, so they do not contact directly. Wear and noise are low; the sealed mill operates under negative pressure with no dust escape. Material stays in the mill only a few minutes, making fineness and quality easier to control and stabilize.
4. Integrated drying Hot gas repeatedly contacts the material in the mill. Feed containing 15%, or even 20%, moisture can enter directly. A raw mill uses kiln exhaust gas as the heat source, eliminating a separate dryer.
Both VRMs and roller presses use material-bed comminution, but their contact geometry differs: a VRM uses a cylindrical grinding roller against a flat grinding table; a roller press uses two cylindrical rolls pressing toward each other. The VRM integrates the separator, while the roller press requires a separate classification system. The VRM system is therefore more compact.
In one sentence: the VRM is the workhorse of grinding, a cost-saving machine in the plant’s biggest power-consuming section, and equipment cement professionals will sooner or later work with every day.
Learn more about SINOTECE Vertical Roller Mill solutions: https://sinotece.com/equipment-supply/grinding-equipment/ -roller-mill

Grinding equipment supply for cement, raw meal, slag and industrial materials, including roller presses, separators, vertical roller mills and ball mills.

28/08/2026

Before FAT Starts, What Should Already Be Ready?
A Factory Acceptance Test should not be the first time the equipment is seriously inspected.
Before the customer arrives for FAT, several basic conditions should already be in place.
1. Approved technical documents
Drawings, specifications, equipment data and technical agreements should all reflect the latest approved revision.
2. Clear acceptance criteria
Each inspection or test should have a defined method and acceptance standard. It should also be clear which requirements can be verified during FAT and which need to be confirmed later under actual operating conditions through production line performance measurement:
https://sinotece.com/commissioning-om/ -line-performance-measurement
3. Completed manufacturing and assembly
The equipment should be substantially complete—not still being assembled while the FAT is underway.
4. Internal pre-testing
Mechanical, electrical, hydraulic, lubrication and control functions should already have been checked internally.
5. Quality records
Relevant material certificates, inspection reports, welding or NDT records, dimensional checks and other manufacturing documentation should be available.
6. Test conditions and instruments
Power supply, test tools, calibrated instruments and any required auxiliary systems should be ready.
7. Open issues identified in advance
Known deviations, NCRs or unfinished items should be clearly recorded rather than discovered during the customer inspection.
For industrial equipment suppliers, a useful principle is:
No approved documents. No internal test. No clear acceptance criteria. No FAT.
Good FAT preparation does more than help an inspection pass. It reduces uncertainty before shipment and helps make installation and commissioning at site much smoother.

27/08/2026

What Is a FAT — and Why Does It Matter?
Before industrial equipment leaves the manufacturer’s workshop, there is one important step that should not be treated as a formality: the Factory Acceptance Test, or FAT.
FAT is carried out before shipment to verify that the equipment has been manufactured, assembled and tested according to the approved technical requirements.
Depending on the equipment and project scope, the FAT may include checks on:
▪ Equipment configuration and dimensions
▪ Mechanical assembly and workmanship
▪ Electrical and instrumentation functions
▪ Hydraulic and lubrication systems
▪ Interlocks, alarms and emergency stops
▪ No-load operation
▪ Technical and quality documentation
But FAT has an important boundary.
It normally verifies whether the equipment itself is ready for shipment. It does not necessarily prove that a complete production line will achieve its final capacity, power consumption or product-quality guarantees under actual plant conditions.
Those performance indicators are usually verified later during site commissioning and performance testing.
For cement plants and other industrial projects, a well-prepared FAT helps identify problems before equipment reaches site—when corrections are usually much easier and less costly.
FAT is not just an inspection before shipping. It is one of the key quality gates between manufacturing and site installation.
Read more：https://sinotece.com/commissioning-om/