Peru is rich in non-metallic mineral resources, with limestone, calcite, barite, and similar minerals widely used in building materials, coatings, and other industrial applications. For a mining powder-processing project sited in the Andean highlands, factors such as day-night temperature swings, grid voltage fluctuations, and on-site maintenance conditions can raise the bar for stable grinding-equipment operation.
UNIQUEMAC recently completed on-site installation and commissioning of a complete YGM95 high-pressure suspension roller Raymond mill grinding line delivered to a non-metallic mineral powder-processing plant in Peru. The project’s primary raw material is limestone, with a feed particle size of ≤25 mm, a target product fineness of 200–325 mesh, and a required stable output of 2–5 t/h.
After no-load running, gradual load trials, parameter tuning, and continuous test operation, the equipment ran stably on-site, with finished-product fineness adjustable within the 200–325 mesh range and vibration, bearing temperature, and motor current all staying within design limits — meeting the customer’s powder-production targets.
This article walks through the project’s operating conditions, the YGM95 equipment configuration, the on-site commissioning process, high-altitude site adaptation, and how fineness was adjusted, to give a detailed account of this Peru Raymond mill project.
The customer for this project is a non-metallic mineral powder-processing plant in Peru, producing limestone and calcite filler for the building-materials and coatings industries.
According to the project plan, the main on-site operating conditions were as follows:
|
Item |
Project Parameter |
|
Project country |
Peru |
|
Customer type |
Non-metallic mineral powder-processing plant |
|
Primary raw material |
Limestone |
|
Feed particle size |
≤25 mm |
|
Raw material moisture |
≤6% |
|
Target fineness |
200–325 mesh |
|
Stable output |
2–5 t/h |
|
Grinding equipment |
YGM95 high-pressure suspension roller Raymond mill |
This project needed more than just a standalone Raymond mill unit — it required a complete powder-processing system configured around the raw material’s particle size, the target product fineness, and on-site conditions.
This Peru project uses a complete grinding line rather than a standalone Raymond mill unit. The main equipment includes:
The YGM95 main unit is configured with 4 grinding rollers and a 37 kW main motor. The electrical control system was also adapted to local power supply conditions in Peru. This complete configuration forms a continuous production workflow — from raw material feeding, grinding, and classification through to collection and dust removal.
Based on the equipment specifications outlined for this project, the main technical parameters of the YGM95 are as follows:
|
Technical Parameter |
YGM95 |
|
Number of grinding rollers |
4 sets |
|
Maximum feed particle size |
≤25 mm |
|
Finished-product fineness |
80–425 mesh |
|
Processing capacity |
2.1–6.5 t/h |
|
Main motor |
37 kW |
|
Suitable material hardness |
Mohs hardness ≤9.3 |
|
Material moisture |
<6% |
|
Fineness adjustment |
Adjustable classifier speed |
It’s worth specifically noting that a machine’s theoretical processing capacity and a project’s actual output are not the same thing.
Actual output is affected by a range of factors, including material hardness, moisture content, feed particle size, target fineness, feed rate, and equipment operating parameters.
For this Peru project, the actual production target was a stable 2–5 t/h, with a target finished-product fineness of 200–325 mesh.
Limestone is a classic raw material for non-metallic mineral powder processing.
After crushing, limestone enters the Raymond mill system, where it’s compressed and ground between the grinding rollers and the grinding ring before being carried by airflow into the classification system.
The whole process can be summarized as:
Limestone raw material → feeding → grinding → classification → collection of qualified powder → dust removal
The YGM95’s high-pressure grinding structure is able to apply substantial grinding pressure to material entering the grinding chamber.
At the same time, classifier speed is adjustable, allowing the production system to be tuned according to the target product particle size.
For this Peru project, the customer required a finished product of 200–325 mesh — so the focus of on-site commissioning wasn’t simply chasing maximum output, but finding the right balance between output, fineness, and operating stability.
Once equipment installation is complete, systematic on-site commissioning is required. This project followed the process below: pre-commissioning inspection → no-load trial run → loaded trial run → parameter adjustment → finished-product testing → continuous operation.
Before formally starting the YGM95 Raymond mill line, the mechanical, electrical, and airway systems all needed a full inspection to confirm every system was ready for commissioning.
Mechanical Inspection
Key checks:
Only once the mechanical components were confirmed to be correctly installed, securely connected, and properly lubricated did commissioning move on to the next stage.
Electrical Inspection
Key checks:
For this Peru project, the electrical control system was adapted to local power-supply conditions, and the electrical system’s operating condition was checked in parallel throughout commissioning.
Airway and Dust-Removal System Inspection
The grinding line uses a circulating airway system, so before formally feeding material, the following also needed to be checked:
Inspecting the airway and collection system helps reduce the impact that connection issues or air leaks could have on the operation of the grinding system.
Once the mechanical, electrical, and airway inspections were complete, the project moved into the no-load trial run stage.
This Peru project completed 8 hours of no-load operation, used mainly to observe how the equipment behaved with no material present.
Key checks during the no-load run:
If abnormal vibration, abnormal noise, unusual temperatures, or other equipment issues had been identified during the no-load run, they would need to be fully investigated and resolved before moving on to the loaded trial run.
Once the no-load run was confirmed normal, the project moved into the loaded trial run stage.
For this project, material was fed in gradually based on limestone grinding conditions, with operating parameters adjusted in line with on-site finished-product test results.
Step 1: Gradually Increasing the Feed Rate
The loaded trial shouldn’t start by sharply increasing the feed rate — it should be adjusted step by step based on how the equipment is running.
Key things observed:
Gradually increasing the feed rate allows the equipment to settle progressively into an operating state suited to the current material conditions.
Step 2: Adjusting Core Operating Parameters
The finished-product fineness of the YGM95 Raymond mill line is tied to the operating condition of the grinding, classification, and airway systems.
On-site attention focused on:
Classifier operating parameters directly affect powder classification condition; airflow volume needs to be adjusted in line with material conveying and classification behavior; and feed frequency needs to be matched to the equipment’s current operating condition.
For this reason, on-site commissioning usually isn’t a matter of adjusting a single parameter — it’s a matter of comprehensive optimization based on finished-product test results.
Step 3: On-Site Sampling and Testing
Once running under load, samples of the finished product were taken, and test results were used to judge whether the current powder fineness met the project requirement.
The target finished-product fineness for this Peru project was 200–325 mesh.
Where test results differed from the target fineness, classifier operating parameters, airflow volume, and feed frequency were adjusted accordingly, followed by another round of sampling to confirm the result.
Through this run — sample — test — adjust cycle, the operating parameters suited to the current limestone material were progressively established.
Step 4: Continuous Loaded Trial Run
Once equipment operating condition and product fineness met the project requirements, the continuous loaded trial run proceeded.
Key things monitored:
This project completed the continuous loaded trial run, and the on-site results showed that finished-product fineness was adjustable within the 200–325 mesh range, with equipment vibration, bearing temperature, and motor current all within design limits.
Classifier speed is a key parameter affecting finished-product particle size. Adjusting the classifier speed changes the particle-size range of powder that passes into the finished-product system.
Circulating airflow affects how powder is conveyed and classified within the grinding system.
An excessive feed rate can increase mill load, so it needs to be matched to the equipment’s grinding capacity. In the end, classifier speed, airflow, and feed frequency were tuned together comprehensively, with on-site sampling used to verify the finished-product mesh size.
This project is located in a mining area in the Peruvian Andean highlands. Compared with a typical lowland site, a high-altitude mining site requires closer attention to on-site environmental conditions.
Air conditions at high altitude differ from those at lower elevations. As a result, on-site attention needed to focus on: motor temperature + bearing temperature + continuous operating condition. This project placed particular emphasis on monitoring bearing temperature during commissioning, to confirm the equipment stayed within its designed operating range.
The project site in Peru experiences grid voltage fluctuations. To address this, the electrical control system was adapted to local voltage conditions, and the commissioning process checked: motor startup, current changes, electrical control protection, and continuous operating condition — helping reduce the impact of power-supply fluctuations on equipment operation.
Mineral powder processing inherently tends to generate dust. If equipment sealing is inadequate, dust can escape at connection points. Because of this, particular attention was paid to inspecting: duct and piping connections, flange connections, gaskets and seals, cyclone-collector connection points, the pulse dust collector, and the negative-pressure air circuit. This project was equipped with a pulse dust collector and a negative-pressure enclosed system, which helps reduce dust escape.
This Peru project completed the full journey from equipment installation through on-site commissioning.
Limestone, feed ≤25 mm, moisture ≤6%.
Target finished-product fineness of 200–325 mesh.
Designed stable output of 2–5 t/h.
YGM95 high-pressure suspension roller Raymond mill + feeding + elevation + classification + air system + powder collection + dust removal + electrical control system.
Completed 8 hours of no-load operation plus a continuous loaded trial run.
Finished-product fineness adjustable within 200–325 mesh, with equipment vibration, bearing temperature, and motor current all within design limits — meeting the customer’s powder-production targets.
This confirms that the complete YGM95 grinding line has successfully passed a key verification milestone, from installation through on-site trial operation.
The YGM95 uses a high-pressure suspension roller grinding structure, which strengthens the material-grinding process by increasing grinding pressure. For non-metallic minerals such as limestone, parameters can be configured based on the target fineness and output requirements.
This Peru project required a 200–325 mesh finished product. By adjusting operating parameters such as classifier speed, product particle size can be controlled. This adjustability has real practical value for powder-processing plants that need to serve different fineness requirements at different times.
This project used a cyclone powder collector plus pulse dust removal to form a complete powder-collection and dust-removal system. For mining powder-processing projects, controlling dust throughout grinding, conveying, and collection is a critical part of production-line design.
One important difference between overseas and domestic projects is that voltage, altitude, climate, operating habits, and maintenance conditions can all vary significantly from country to country. For this Peru project, the electrical control system was adapted to local power-supply conditions, while temperature and operating condition were closely monitored to account for the high-altitude environment. This is a point worth paying close attention to when designing overseas grinding projects.
The YGM95 can be used for a range of mineral powder projects suited to Raymond mill processing, for example:
That said, hardness, moisture content, feed particle size, and target fineness vary from one material to another, so output can’t be determined based on material name alone. If you need equipment selection support, it’s best to provide the following information so a specific solution can be designed:
Material name + Mohs hardness + maximum feed particle size + moisture content + target fineness + required output
Q1: What are the key checks during the YGM95 Raymond mill’s no-load trial run?
A: The main checks are: main unit vibration, bearing temperature, noise, fan operating condition, classifier operating condition, motor operating condition, lubrication condition, and airway sealing.
Q2: Can the YGM95 Raymond mill adapt to a high-altitude mining site in Peru?
A: Yes. This is achieved through targeted configuration and commissioning based on the specific on-site conditions of each project. This Peru project is located in the Andean highlands, and on-site commissioning focused specifically on heat dissipation, voltage fluctuation, and sealing/dust-proofing, ultimately completing on-site trial operation successfully.
Q3: What supporting equipment does a complete YGM95 Raymond mill production line need?
A: The configuration for this Peru project included: vibrating feeder + YGM95 Raymond mill + bucket elevator + classifier + circulation fan + cyclone powder collector + pulse dust collector + electrical control cabinet. The actual configuration needs to be adjusted based on project output, plant layout, raw material properties, and environmental requirements.
Q4: How is finished-product fineness adjusted on-site for the YGM95 Raymond mill?
A: Mainly by adjusting classifier speed, fan airflow, and feed frequency, combined with on-site sampling to test finished-product particle size and fine-tuning based on the results.
A successful trial run is the start of stable operation for an overseas grinding project. This Peru YGM95 high-pressure suspension roller Raymond mill project completed on-site installation, an 8-hour no-load trial run, and a continuous loaded trial run, ultimately achieving finished-product fineness adjustable within 200–325 mesh, with equipment vibration, bearing temperature, and motor current all within design limits — meeting the customer’s powder-production targets.
For Peru and other South American non-metallic mineral powder projects, Raymond mill selection can’t be based on equipment model and theoretical output alone. What genuinely determines how well a project performs is:
Material properties + feed particle size + moisture content + target fineness + output requirements + local voltage + altitude environment + a complete supporting system
UNIQUEMAC offers not only the YGM series of high-pressure suspension roller Raymond mills, but also complete grinding production line design tailored to different minerals, fineness requirements, and output targets.
If you’re planning a limestone, calcite, barite, or other non-metallic mineral grinding project in Peru, Chile, Bolivia, Ecuador, or elsewhere in South America, you can share the material name, feed particle size, target mesh size, hourly output, and your local power supply and altitude conditions — and we can use that information to design a YGM-series Raymond mill selection and complete production line solution.
