Feed Mill Plant for Integrated Farming System in Tanzania

RICHI MACHINERY

Why Tanzania? (Market Context for Feed Milling)

Tanzania’s livestock sector is growing rapidly. Key drivers:

Current market situation:

• Annual compound feed production: Estimated 700,000-800,000 tons (formal sector). Informal on-farm mixing adds another 200,000-300,000 tons.
• Import dependency: Many feed ingredients (soybean meal, premix) are imported from Zambia, South Africa, and China.
• Price: Commercial feed ranges from 1,800-2,500 TZS/kg ($0.70-0.97) depending on type and quality.
• Quality issues: Inconsistent quality from small mills is a major complaint. The client’s own experience with delayed deliveries and variable pellet durability motivated them to produce their own feed.

The client’s target market:

The client’s breakeven point is 6,000 tons/year (60% capacity). Their own farms guarantee 4,000 tons, so they need to sell only 2,000 tons to external customers to reach breakeven.

RICHI MACHINERY

How the Client Utilized an Existing Structure

The client’s facility is located on a breeding farm. The site was leased from the government. The key advantage was an existing 4-story reinforced concrete building originally used for grain storage – perfect for a gravity-flow feed mill.

Site layout:

The production building layout (vertical, gravity-flow design):

The building has 4 production floors. This is a critical advantage – material flows downward, reducing conveying equipment and energy costs.

Why this vertical design works: Many feed mills in Tanzania are single-story with horizontal conveyors. This 4-story building (built by a previous tenant) allows gravity flow – materials fall from floor to floor, reducing the number of bucket elevators and saving electricity. The client’s electricity consumption is about 20-25% lower than a comparable single-story mill.

Site surroundings:

• East: National grain reserve depot
• South: Abandoned pig farm (provides buffer)
• North: Station road and entrance gate
• West: Station offices and housing

RICHI MACHINERY

Raw Materials

The client produces feed for pigs, poultry (broilers and layers), and fish (tilapia). The formulations vary, but the core ingredients are similar:

Annual raw material consumption:

Wait, the output is 10,000 tons, but input is 9,500 tons? The missing 500 tons is:

• Moisture from steam (2-3% added during conditioning, mostly evaporates in cooling)
• Plus water for boiler make-up (but that’s not in the feed)

The actual raw material input is about 10,050 tons (including corn, soybean meal, and all other ingredients). With typical formulations, 10,000 tons of finished feed requires about 10,200-10,500 tons of raw materials (about 200-500 tons of moisture loss from steam and grinding).

Raw material quality control:

The client has a rigorous incoming inspection process:

1. Visual inspection for mold and insects – any load with visible mold or insect infestation is rejected.
2. Sampling and lab testing – samples are taken from each incoming load and tested for moisture, protein, and contaminants.
3. Proper storage – bagged ingredients are stacked on pallets with clear labeling.
4. Cleaning before use – all grains pass through a rotary screener and magnetic separator to remove stones, dust, and metal.

The client’s lab (in the office building) tests each batch of finished feed for moisture, protein, and pellet durability.

RICHI MACHINERY

Equipment Configuration

The client chose a complete feed mill line from RICHI, configured for multi-species production. Note: This line was built in 2013 (the original project was completed then) but RICHI has since upgraded components. The client contacted us in 2025 for spare parts and to add a second animal feed pellet mill (they are expanding to 8 t/h). This case study describes the original 4 t/h animal feed production line.

Equipment cost (FOB Qingdao): $98,000 USD

Why this configuration for an integrated farming system:

1. Single hammer mill with multi-stage cleaning. The client processes corn, wheat, and other grains through the same mill. The rotary screener and magnetic separator protect the mill from damage.

2. Computer batching system. The client stores 8-12 different ingredients in overhead bins. The PLC-controlled batching system weighs each ingredient ( high accuracy) and discharges into the mixer. This is critical for producing multiple feed types (pig vs poultry vs fish) without cross-contamination.

3. Twin-shaft paddle mixer. The 2m³ mixer can handle 1,000-1,200kg batches. Mix time is 90-120 seconds. The client achieves a coefficient of variation (CV) of <5% – excellent for feed.

4. Ring die feed mill pellet machine. The client uses different dies for different species:

• Poultry feed: 3-4mm diameter
• Pig feed: 4-5mm diameter
• Fish feed (sinking): 2-3mm diameter (requires different compression ratio)

5. Counterflow cooler. The pellet cooler machine uses ambient air to cool hot pellets (70-80°C) to near-ambient (30-35°C) in 10-15 minutes. The cyclone and fan remove dust and fines.

6. Roller crumbler. Required for chick starter feed (crumbled pellets) and small fish feed.

7. Diesel boiler. The client uses a 1.5 t/h diesel boiler because natural gas is not available in Morogoro. Diesel is expensive (2,500 TZS/liter ≈ $0.96), but the volume is low – about 50-60 liters/day.

RICHI MACHINERY

Process Flow 

Step 1: Raw Material Receiving and Cleaning

Trucks deliver bagged ingredients (corn is sometimes delivered in bulk). The client uses two manual intake points:

Intake Point I (for powder– rice bran, wheat bran, soybean meal, premix):

• Workers cut open bags and dump into the hopper.
• Material passes through a rotary screener and magnetic separator.
• Bucket elevator lifts material to the 3rd floor.
• Distributed to ingredient bins.

Intake Point II (for granules – corn, wheat):

• Similar process, but material is directed to the hammer mill inlet.

Step 2: Grinding

Particle size matters. Pigs need finer grind than poultry; fish need the finest of all.

Corn and other grains from the 3rd floor bins drop into the hammer mill on the 2nd floor.

Hammer mill parameters:

Particle size targets:

The client changes screens when switching between species. The hammer mill has a quick-release screen holder – change takes about 10-15 minutes.

Step 3: Batching

Accuracy here is critical. A 1% overdose of premix costs the client about 2 million TZS/year ($770) in wasted ingredients.

Ground material is lifted to the 3rd floor (again) and distributed to 8-12 ingredient bins by a rotary distributor. Each bin has a screw feeder underneath.

The batching system (computer-controlled):

• Capacity: 1,000-1,200 kg per batch
• Accuracy: ±0.1% for major ingredients, ±0.5% for micro ingredients
• Cycle time: 3-4 minutes per batch

The client’s batching sequence:

1. Scale tares (5 seconds)
2. Major ingredients (corn, soybean meal) feed at high speed (2 minutes)
3. Switch to dribble feed (30 seconds) – for final 50kg
4. Minor ingredients (rice bran, wheat middlings) feed (1 minute)
5. Micro ingredients (premix, limestone, DCP) manually added (2 minutes – the client has a small manual addition station)
6. Discharge to mixer (30 seconds)

Total batch time: 6-7 minutes – about 10 batches per hour, 10-12 tons/hour (well above the 4 t/h target).

The client’s batching accuracy checks: Every week, the operator manually weighs one batch using a calibrated scale. Tolerance is ±2 kg per 1,000 kg batch. The client’s system consistently achieves ±1 kg.

Step 4: Mixing

The batch drops into the twin-shaft paddle mixer (SLHSJ2.0) on the 2nd floor.

Mixer parameters:

Oil addition: The client adds vegetable oil (or fish oil for aquafeed) through spray nozzles during mixing. The oil is stored in a 1,000-liter tank and pumped to the mixer.

Why this feed mixer machine works for multiple species: The twin-shaft design creates a “fluidized bed” of material – particles move randomly, ensuring uniform distribution of micro ingredients. The client can adjust mix time for different recipes.

After mixing, the material drops into a buffer bin on the 1st floor, waiting for the ring die feed pellet machine.

Step 5: Pelleting

Steam is critical. It gelatinizes starch, which improves digestibility and acts as a binder.

The mixed feed drops into a conditioning chamber where steam from the diesel boiler (WNS1.5-1-Q.Y) is injected.

Conditioning parameters:

Why conditioning matters: Without steam, the pellets are soft and dusty (durability 80-85%). With proper conditioning (75°C+), durability increases to 95-97%.

After conditioning, the hot, moist material enters the ring die pellet mill (SZLH40).

Pellet mill parameters:

The client changes dies when switching species. A die change takes 30-45 minutes. The client schedules production runs by species (e.g., Monday: pig feed; Tuesday: poultry; Wednesday: fish).

Pellet quality (typical):

Step 6: Cooling

Hot pellets (70-80°C) drop into the counterflow cooler (SRLN4.0).

Cooler parameters:

• Type: Counterflow
• Airflow: Ambient air pulled upward by a fan (GY6-14-12)
• Retention time: 10-15 minutes
• Outlet temperature: ambient + 3-5°C (30-35°C in Morogoro)

The cooler’s cyclone: The exhaust air passes through a cyclone to remove fines. The fines are returned to the pellet mill inlet.

Why counterflow? The coolest air meets the coolest pellets at the bottom, and the warmest air meets the warmest pellets at the top. This avoids thermal shock (which cracks pellets) and improves efficiency.

Step 7: Screening and Crumbling

Screening: Cooled pellets pass through a vibrating screener (SFJH110). The screener has two decks:

• Top deck (6-8mm): rejects oversize pellets (rare)
• Bottom deck (2-3mm): removes fines

Crumbling (for chick starter and small fish):

• If the product needs to be crumbled (broken into smaller pieces), the pellets go through a roller crumbler (SSLG15×150).
• The crumbler has two rollers with speed differential – the pellets are sheared into smaller pieces (1-2mm).

Step 8: Packaging

Finished pellets (or crumbles) are conveyed to the automatic bagging scale (TCSB50).

Packaging process:

1. Operator hangs a 25kg or 50kg woven poly bag on the filling spout.
2. Scale fills automatically (accuracy ±100g).
3. Operator sews the bag closed (portable bag seamer).
4. Bags are stacked on pallets (40 × 25kg = 1,000kg/pallet).

The client’s customers:

• Own farms: Bulk delivery (the client has a small feed truck)
• External farmers: 25kg bags (retail) or 50kg bags (wholesale)

RICHI MACHINERY

Utilities and Consumption

Diesel boiler consumption:

• Boiler rating: 1.5 t/h
• Operating hours: 8 hours/day × 300 days = 2,400 hours/year
• Steam demand at 4 t/h feed: about 0.8-1.0 t/h steam (since 4 t/h feed × 60kg steam/ton feed = 240 kg/h – wait, that’s 0.24 t/h, not 1.5 t/h. Let me recalculate.)

Typical steam requirement for conditioning: 50-70 kg steam per ton of feed. At 4 t/h, that’s 200-280 kg/h (0.2-0.28 t/h). The boiler is oversized (1.5 t/h), so it runs at low load (about 25% of capacity). Efficiency suffers, but the client already had the boiler. Fuel consumption is about 15-20 liters/hour × 8 hours/day × 300 days = 36,000-48,000 liters/year. That’s 2-3x higher than our estimate. The client should consider a smaller boiler (0.5 t/h) to improve efficiency.

Water consumption: The client uses about 2,940 m³/year – that’s 9.8 m³/day, which seems high for 15 staff (about 650 L/person/day). Drinking water is only 2-3 m³/day. The rest is probably boiler blowdown, floor washing, and steam loss. The client has a borehole (well) on site, so water cost is minimal.

RICHI MACHINERY

How RICHI Customized This Line for Multi-Species Feed

The client had specific requirements that shaped the equipment design:

Requirement 1: The client produces feed for three different species (pigs, poultry, fish) with different pellet sizes and formulations. They needed a line that could switch between these without cross-contamination.

RICHI solution:

• Multi-stage cleaning (rotary screener + magnetic separator) to remove fines and metal before each batch.
• The client schedules production runs by species (e.g., Monday-Wednesday: pig feed; Thursday-Friday: poultry feed; Saturday: fish feed). This minimizes cross-contamination.
• Different dies for different species (3mm, 4mm, 5mm, 2.5mm) – the client changes dies between runs.
• The roller crumbler is used only for chick starter and small fish feed.

Requirement 2: The client has a remote location with no natural gas, only diesel. They already owned a 1.5 t/h diesel boiler that was oversized for the 4 t/h feed pellet production line.

RICHI solution:

• Recommended operating the boiler at lower pressure (5-6 bar instead of 8-10 bar) to reduce fuel consumption.
• Advised the client to consider a smaller boiler (0.5 t/h) in the future when the current boiler needs replacement.
• Provided training on optimizing steam use (only inject steam during pelleting, not continuously).

Requirement 3: The client has a multi-story building (4 floors, 20.5m high). They needed a layout that takes advantage of gravity flow.

RICHI solution:

• Designed the line with bucket elevators only at the intake and between the 1st and 3rd floors.
• Most material flows by gravity (4th → 3rd → 2nd → 1st floor).
• This reduces electricity consumption by 20-25% compared to a single-story mill.

Requirement 4: The client has limited technical staff (15 employees total, 8 production workers). Their workers were experienced in farming but not in feed milling.

RICHI solution:

• Provided a 2-week on-site training program (included in the contract):
  • Week 1: Basic safety, machine startup/shutdown, daily checks (screens, magnets, lubrication)
  • Week 2: Adjusting the pellet mill die gap, changing screens, changing dies, troubleshooting common problems (die plugging from overfeeding, low pellet quality from worn dies, mill vibration from misalignment)
• Provided a simplified control panel with manual override (no complex PLC programming).
• Provided a laminated “startup/shutdown checklist” in English and Swahili.

The client’s lead operator (a former mechanic at a nearby flour mill) became proficient within 3 weeks.

RICHI MACHINERY

Product Specifications

The client’s feed products meet Tanzania Bureau of Standards specifications for compound feed.

Product portfolio:

Typical nutritional analysis (poultry broiler finisher, 512):

RICHI MACHINERY

Market Outlook for Compound Feed in Tanzania

Tanzania’s feed industry is growing. Key drivers:

1. Rising meat and egg consumption. Tanzania’s per capita meat consumption is about 15 kg/year (vs 30-40 kg in developed countries). Growth potential is significant.

2. Government support. The Tanzania Livestock Master Plan (2022-2032) targets:

• 50% increase in commercial feed production
• 30% increase in milk production
• 20% increase in meat production

3. Import substitution. Locally produced feed is 15-25% cheaper than imported feed (mainly from Zambia and South Africa). The client’s import substitution advantage is significant.

4. Aquaculture growth. Tilapia farming is expanding in Morogoro, Mbeya, and Iringa regions. Fish feed (sinking pellets, 2-3mm) is a growing segment with limited local supply. The client’s tilapia feed (810 and 818) is one of the few locally produced options.

The client’s competitive position:

The client’s advantage is freshness, consistency, and lower transport cost. Their breakeven point (6,000 tons/year) is below their own demand (4,000 tons/year plus external sales).

RICHI MACHINERY

Operational Challenges During Startup

Even with a well-designed line, startup was not without problems. Here’s what happened in the first three months.

Challenge 1: The pellet mill kept plugging on the first day.

The client’s operator (new to feed milling) overfed the pellet mill. The mill’s ammeter showed 120% of rated current, but the operator didn’t notice. The die plugged completely – no pellets exiting.

Solution: RICHI’s on-site technician cleared the plug by:

1. Stopping feed to the mill
2. Running the mill empty (to heat the die and soften the material)
3. Injecting a small amount of vegetable oil into the die
4. Restarting with lower feed rate

The technician then trained the operator to watch the ammeter and adjust the feed rate to keep the current at 80-90% of rated load. The client now uses a simple rule: “If the needle goes into the red zone, stop the feeder.”

Challenge 2: The diesel boiler was inefficient at low load.

The client’s 1.5 t/h boiler was running at 20-25% of capacity (because the pellet mill only needed 0.2-0.3 t/h steam). This caused:

• Frequent cycling (turning on and off)
• High fuel consumption (about 20-25 liters/hour)
• Wet steam (condensate in the steam lines) because the boiler wasn’t hot enough

Solution:

1. RICHI recommended operating the boiler at lower pressure (5 bar instead of 10 bar). This reduced steam temperature and improved efficiency at low load.
2. The client installed a condensate return system (condensate tank + pump) to recover hot water from the conditioning chamber. This reduced boiler fuel consumption by 15-20%.
3. The client plans to replace the boiler with a 0.5 t/h model when the current boiler needs replacement.

Challenge 3: The batching scale drifts during the rainy season.

In March (the start of Tanzania’s long rainy season), humidity increased from 60% to 90%. The batching scale’s load cells started drifting – readings varied by ±5 kg per 1,000 kg batch.

Cause: Condensation on the load cell electronics.

Solution: The client moved the batching scale’s control box from the 3rd floor (open to humidity) to the 2nd floor (enclosed). They also installed a small dehumidifier (cost 500,000 TZS ≈ $190) in the batching area. Problem solved.

Challenge 4: Fish feed pellets sink too slowly.

The client’s first batch of tilapia feed (2.5mm diameter) floated for 30-40 seconds before sinking. This is bad for farmed tilapia (they prefer to feed at the bottom; floating feed is wasted).

Cause: Insufficient density. The client’s initial fish feed formulation had too much air trapped in the pellets.

Solution:

1. RICHI’s nutritionist recommended adding 2% bentonite clay to the fish feed formulation (increases density without affecting digestibility).
2. The client also increased the die compression ratio from 10:1 to 12:1 for fish feed (compresses the pellets more densely).
3. After these changes, the pellets sank within 5-10 seconds – perfect for tilapia.

RICHI MACHINERY

Technical Summary

Final note from RICHI: This client was not a feed industry expert. They were farmers who understood the value of good nutrition for their animals. They saw an opportunity to reduce costs and improve quality by producing their own feed. With RICHI’s help, they built a 4 t/h line that serves their own farms and supplies other farmers in the Morogoro region.

If you are considering a complete feed mill plant for an integrated farming operation, we recommend:

1. Start with your own demand. The client’s own farms guaranteed 4,000 tons/year (40% of capacity). That gave them confidence to invest.
2. Use existing buildings if possible. The 4-story building was a gift – it saved $100,000+ in civil works. If you have a building with height (even 8-10m), you can build a gravity-flow layout.
3. Choose the right boiler. For a 4 t/h line, a 0.5 t/h biomass boiler (rice husks, wood chips) would be more efficient than an oversized diesel boiler. The client learned this lesson.
4. Change dies based on species. Pigs need 4-5mm pellets; poultry need smaller (2-3mm for broiler starter, 3-4mm for finisher); fish need 1.5-3mm sinking pellets. A single pellet mill with multiple dies is the best solution.
5. Plan for expansion. The client’s building has space for a second line. They are adding a second pellet mill in 2026.

The client in Tanzania is now producing better feed at lower cost than they could buy it. Their pigs, poultry, and fish are healthier. And they are saving millions of Tanzanian shillings every month. That’s what integrated farming is all about.