0.6–0.8 T/H Fish Feed Micron Powder Grinder in Greece

After reviewing the target particle size, ingredient characteristics and daily production requirements, the company selected an SWFL90 ultrafine grinder from RICHI Machinery. The machine was integrated into the existing process to prepare micron-sized powder for premium larval feed production, allowing the manufacturer to retain its established upstream equipment while improving control over the fine-grinding stage.

Why the SWFL90 Was Selected for Larval Feed Grinding

First-feeding fish require feed particles appropriate to their mouth gape, feeding behavior and developmental stage. Particles that are too large may be difficult for larvae to ingest, while inconsistent particle distribution can make it harder to deliver a suitable feed to the entire population. For the Greek manufacturer, the target was approximately 75–100 microns, corresponding roughly to 150–200 mesh.

The existing hammer mill could reduce material to a useful intermediate size, but it did not provide sufficient control over the finest fraction. The SWFL90 offered a different grinding arrangement, combining high-speed impact with an internal classifier wheel. Rather than allowing particles to leave solely according to a screen opening, the classification system separates finer material from coarser particles and returns oversized material for further grinding.

The selected model has a 90 kW main motor and a nominal capacity of 1–2 tons per hour under standard conditions. With a finer 1.0 mm pre-screen used for the larval feed application, the expected working capacity was lower, at approximately 0.6–0.8 tons per hour. This was a better match for the manufacturer's premium product requirements than choosing a larger machine based only on its maximum rated output.

Technical Specifications of the Fish Feed Micron Powder Grinder

These operating figures describe the selected project's configuration. Actual output and particle distribution depend on ingredient composition, moisture, oil content, pre-grinding quality, classifier settings and the performance of the air-handling system. The final settings should be established through material testing and commissioning rather than treated as universal values for every fish feed formula.

Processing Fish Meal, Squid Meal and Krill Meal

The manufacturer's larval feed formulations used several nutrient-dense ingredients that required careful size reduction. Fish meal supplied concentrated protein, while squid meal and krill meal contributed additional nutrients and feeding-related properties. Algae ingredients, fish oil and specialized vitamin-mineral premixes were incorporated according to the requirements of each product.

Indicative ingredient inclusion ranges used during formulation planning were as follows:

• Fish meal: approximately 35–45%, depending on the product.
• Squid meal: approximately 10–15%.
• Krill meal: approximately 5–10%.
• Algae meal: approximately 5–10%.
• Fish oil: approximately 8–12%.
• Specialized vitamin and mineral premix: approximately 3–5%.

These ranges represent ingredient options rather than a single balanced recipe; their combined inclusion must be adjusted to total 100%, with the remaining ingredients and nutrient specifications determined by a qualified aquafeed formulator. Oil-rich ingredients also require particular attention because their physical properties can affect flow, heat generation and particle separation during grinding.

The fine grinder was primarily assigned to ingredients that needed additional size reduction before final feed preparation. The existing hammer mill remained useful for preliminary crushing, while the SWFL90 handled the finer grinding requirement. This division of work helped avoid using a conventional hammer mill for a task beyond its intended operating range.

How the Ultrafine Grinding Process Works

For this application, the grinding process began with preliminary size reduction through a 1.0 mm screen. This finer pre-screen was selected to reduce the workload on the ultrafine grinding stage and help achieve the required final particle distribution. It also reduced the potential throughput compared with a standard 2.0 mm pre-screen, making capacity planning important.

1. Pre-grinding: Fish meal and other suitable ingredients were reduced to a consistent intermediate size before entering the SWFL90.
2. Impact grinding: The high-speed rotor and hammers further reduced the particles inside the grinding chamber.
3. Air-assisted separation: Airflow carried the ground material toward the classifier wheel.
4. Particle classification: The rotating classifier separated material according to the combined effects of particle characteristics, airflow and operating settings.
5. Recirculation: Particles that did not meet the required fineness remained in the system for further grinding, while the accepted fine fraction moved to collection.

The classifier wheel was particularly important because the manufacturer needed a controlled fine fraction rather than simply a high proportion of material passing through a conventional screen. During initial trials, the classifier was set at approximately 3,200 RPM, with the airflow adjusted to suit the material and target particle size.

The collected powder then underwent particle-size testing before being released for subsequent feed manufacturing stages. This verification was essential because the percentage of particles within the target range mattered as much as the nominal average size.

Installation and Delivery to Patras, Greece

The SWFL90 was shipped from Qingdao, China, to the Port of Piraeus in Greece. The sea voyage was planned at approximately 30–35 days, followed by inland transportation to the manufacturer's facility near Patras, around 200 km west of the port. Customs clearance and final delivery were coordinated with the customer's local logistics provider.

The delivered equipment package included the 90 kW grinder, classifier wheel assembly, feeder, cyclone and airlock discharge components, along with spare hammers, screens and installation documentation. The classifier assembly used bearings selected for its high-speed operating conditions.

At the facility, the customer prepared a reinforced concrete foundation with vibration-damping mounts. The machine's installation weight was approximately 4.5 tons, so the foundation and lifting arrangements needed to accommodate the equipment safely. The electrical installation was configured for the local 400 V, 50 Hz, three-phase supply, with motor protection and cable sizing determined by the electrical contractor.

The air-handling system was also planned as part of the installation. A high-efficiency baghouse filter was fitted to collect airborne fines and reduce the loss of expensive feed ingredients. Dust collection, ducting, access for maintenance and safe isolation of electrical equipment were all important considerations for the completed installation.

Particle Size Testing and Production Results

During the initial fish meal trial, the classifier was operated at approximately 3,200 RPM with the 1.0 mm pre-screen. The manufacturer's sieve-test records indicated that around 92% of the tested sample passed a 150-mesh sieve, while approximately 85% passed a 200-mesh sieve. These results supported the decision to use the SWFL90 for the fine-grinding stage, although final acceptance depended on the agreed particle-size distribution for each product.

After six months of operation, the company reported that the new system was producing larval feed ingredients within its intended fine-particle range more consistently than the previous hammer-mill-only arrangement. The production team also reported positive feedback from hatchery customers using the resulting starter feeds.

The company's operating records compared larval survival rates of approximately 25–30% before the grinding upgrade with reported rates of 45–55% after introducing the finer feed. These were customer-reported observations, not a controlled trial proving that grinding alone caused the change. Larval survival also depends on hatchery management, water quality, stocking density, feeding frequency, feed composition and the suitability of particle size for each developmental stage.

With the finer pre-screen, the SWFL90 delivered approximately 0.6–0.8 tons per hour under the reported operating conditions. At an eight-hour production schedule, this represented roughly 5–6 tons per day, sufficient for the manufacturer's premium larval feed requirement. The fine-grinding stage was reported to process approximately 1,500 tons annually, depending on operating days and product demand.

Maintenance for Fine Grinding of Aquafeed Ingredients

Fine grinding requires a more deliberate maintenance routine than occasional coarse crushing. The 1.0 mm pre-screen increased the workload on the hammers, so the customer planned inspections and replacement around actual wear rather than waiting for a noticeable decline in output.

• Hammer inspection: The reported replacement interval was approximately 400 operating hours with the finer pre-screen. Actual service life varies with ingredient abrasiveness and operating conditions.
• Classifier bearing lubrication: The customer followed a lubrication schedule of approximately every 150 operating hours under the reported high-speed conditions, subject to the bearing manufacturer's instructions.
• Grinding chamber cleaning: Regular cleaning helped prevent material buildup and reduced the risk of cross-contamination between formulations.
• Screen inspection: The 1.0 mm pre-screen required checks for wear, blockage and damage to maintain consistent feed preparation.
• Particle-size verification: Routine sampling helped identify changes in grinding performance before they affected the finished feed specification.

The machine's hydraulic cover-opening arrangement also simplified access to the grinding chamber. For a plant that routinely inspects hammers and cleans the chamber, easier access can reduce maintenance time, provided the equipment is safely isolated before servicing.

Technical Support for the Greek Hatchery Feed Manufacturer

RICHI's support covered more than the supply of the grinder. The technical team provided guidance on pre-screen selection, classifier adjustment, installation requirements and the spare parts needed for the customer's planned operating schedule. Greek-language installation documentation and electrical drawings helped the local team coordinate the work.

During commissioning, the production team could use remote technical support to review operating settings and address questions about the classifier. The customer also received recommendations for keeping replacement hammers, screens and classifier components available so that routine maintenance would not unnecessarily interrupt production.

These measures were particularly relevant because the grinder was introduced into an existing production process. The aim was to improve the fine-grinding stage while preserving the value of the customer's existing equipment and avoiding the cost and disruption of replacing the complete hatchery feed line.

Choosing a Fish Feed Micron Powder Grinder for Larval Feed

For hatchery feed manufacturers producing diets for seabass, seabream and other marine fish larvae, selecting an ultrafine grinder requires more than comparing nominal capacity figures. Buyers should establish the required particle-size distribution, test representative raw materials and assess how oil content, moisture and ingredient abrasiveness affect the grinding process.

The SWFL90 was selected for this Greek project because the customer needed a fine-particle product, a practical production rate and a classification system that could separate the desired fine fraction from oversized particles. Its application-specific capacity was more relevant to the project than its standard maximum output.

RICHI Machinery supplies grinding and feed processing equipment for aquaculture applications. By matching the grinder configuration to the intended ingredients, target particle size and daily output, manufacturers can make a more informed equipment investment and build a repeatable process for specialized larval feed production.

If your hatchery feed operation requires micron-sized powder for early-stage marine fish diets, share your raw materials, target particle-size distribution and hourly capacity with RICHI Machinery. These details provide a practical starting point for evaluating the appropriate ultrafine grinder and its supporting classification and dust-collection systems.