500KG Feed Mixer Machine for Balanced Nutrition Feed Production in Pakistan

After testing their ingredients—ground wheat middlings (2.0mm), crushed maize (2.5mm), rice bran (1.0mm), cottonseed meal, urea, dicalcium phosphate, limestone, salt, and a vitamin-mineral premix—we recommended the SLHSJ1.0B stainless steel twin-shaft paddle mixer with a 7.5kW motor and a batch capacity of 500 kg.

The stainless steel construction was essential because the cooperative uses urea, which can corrode carbon steel over time. The twin-shaft design also provides faster mixing than a ribbon mixer, which was important for the cooperative's production schedule. The cooperative purchased one unit as a standalone mixer to serve all member farms.

Why Balanced Nutrition Requires Uniform Mixing

Balanced nutrition is not just about using the right ingredients—it is about distributing those ingredients evenly throughout each batch. Urea, for example, is a valuable source of non-protein nitrogen for ruminants, but the margin between a safe level and a toxic level is narrow. If urea is not uniformly mixed, some animals receive a dangerously high dose while others receive very little. Similarly, trace minerals like selenium and copper are essential in small amounts but toxic in excess. The cooperative's veterinarian had documented two cases of urea toxicity in member herds in the previous year, both traced back to poorly mixed feed from the old system.

The SLHSJ1.0B Paddle Mixer Machine uses twin counter-rotating paddle shafts that create a fluidized mixing zone. Unlike a vertical mixer that can leave dead spots at the bottom, the twin-shaft design keeps all particles in suspension. The cooperative's quality team tested the first 30 batches from the new mixer and found a coefficient of variation (CV) of under 5% for urea distribution—well below the 10% industry standard for high-risk ingredients.

Machine Selection and Mixing Parameters for Dairy Concentrate

The cooperative selected the SLHSJ1.0B with stainless steel construction. The 500 kg per batch capacity matches their production volume of about 2,000 tons of concentrate per year (eight batches per day, 250 operating days per year). The 7.5kW motor is chain-driven, which is reliable in dusty conditions and easy for local mechanics to maintain.

The mixing parameters developed during commissioning were:

• Mixing time per batch: 3.5 minutes (validated by sampling at 30-second intervals)
• Loading sequence: Half of the base grains (wheat middlings and maize) first, then all of the protein meals and mineral ingredients, then the remaining grains, and finally urea and the vitamin premix on top (added last to prevent floatation)
• Filling level: 75% of the effective volume (0.75 cubic meters of material)
• Discharge: Pneumatic drop-bottom gate

One significant challenge they faced was preventing urea segregation. Urea prills are lighter than ground grain and tend to float to the top of the batch if not properly mixed. The twin-shaft design solved this by keeping the material in constant motion, preventing the urea from separating. The cooperative also added the urea halfway through the mixing cycle rather than at the beginning, which improved distribution further.

What the Mixed Concentrate Is Used For

The cooperative produces a dairy concentrate that member farmers mix with their own forage (wheat straw, corn stover, green fodder). The concentrate formulation is:

• 35% ground wheat middlings
• 20% crushed maize
• 15% rice bran
• 12% cottonseed meal
• 6% urea (non-protein nitrogen)
• 4% dicalcium phosphate
• 3% limestone
• 2% salt
• 3% vitamin and trace mineral premix

The concentrate is sold to member farmers in 40 kg bags. The cooperative manager reported that after switching to the SLHSJ1.0B, complaints from farmers about poor animal performance dropped substantially. Milk production across member herds increased by an average of 2 liters per buffalo per day, and the urea toxicity incidents were eliminated entirely. Farmers also reported that their animals had fewer digestive upsets and better reproductive performance.

Customer Feedback After 15 Months of Operation

We spoke with the cooperative manager about 15 months after delivery. Here is what he told us:

"This stainless steel mixer machine for balanced nutrition feed production has been essential for our cooperative. Before, we were taking a risk every time we mixed a batch with urea. Now we are confident that every bag contains the correct amount. The farmers trust our feed again.

The mill runs about four batches per day, which takes about two to three hours of mixing time. We have put about 500 hours on it. The paddles show minimal wear. The stainless steel construction has no corrosion, even with the urea.

The only issue we had was with the pneumatic discharge gate. The solenoid valve failed after about eight months. We replaced it with a locally sourced part – the valve is a standard size – and it has worked fine since."

The cooperative has since purchased a second SLHSJ mixer – a SLHSJ2.0A feed mixer machine with 1,000 kg batch capacity – for a new member service center being established in a neighboring district.

Other Applications of the SLHSJ Mixer in Pakistani Agriculture

The SLHSJ twin-shaft mixer is widely used across Pakistan for:

• Poultry feed production: Commercial feed mills mixing maize, soybean meal, rice bran, and premixes for broilers and layers
• Goat and sheep feed: Small farmers producing custom concentrates for fattening operations
• Mineral premix manufacturing: Specialty producers making custom blends for other feed mills
• Fish feed production: Aquafeed manufacturers blending ingredients before extrusion
• Organic fertilizer mixing: Blending composted manure with phosphates and other minerals

RICHI feed mixers are used in feed manufacturing operations of all sizes—from small on-farm mixers to large commercial systems producing 3,000 kg per batch. Our equipment has been exported to over 100 countries worldwide, serving feed mills, poultry farms, dairy operations, and aquaculture facilities across Asia, Africa, Europe, and the Americas.

Logistics: Shipping from Qingdao to Karachi

The SLHSJ1.0B was shipped from Qingdao to the Port of Karachi, Pakistan's largest seaport – about 22 days at sea. Karachi serves the Punjab region via well-established trucking routes. From Karachi, the customer arranged truck transport to Sahiwal, approximately 950 kilometers northeast. The total transit time was about 30 days.

Pre-Sale Services We Provided

Before the cooperative placed their order, we offered:

• Ingredient flow testing: They sent us 5 kg samples of each ingredient. We tested the mixing characteristics of the complete blend, including the urea, which required special attention.
• Urea distribution study: We measured urea concentration in samples taken from different locations within the mixer at 30-second intervals to confirm uniform distribution.
• Stainless steel material certificate: We provided documentation confirming that all contact surfaces were 304 stainless steel, resistant to urea corrosion.
• Pneumatic system documentation: We provided a parts list with standard part numbers for the solenoid valve and other pneumatic components, so they could source replacements locally.
• Operator training video in Urdu: We had the video narrated in Urdu, which the cooperative manager said was very helpful for the workers who operate the mixer.

The cooperative manager later told us that the urea distribution study was the most convincing part of the pre-sale process. They had never seen anyone provide that level of technical detail before.

Plans for Expansion

The cooperative is now planning to add a third mixer machine for a different product line: a calf starter feed that requires a finer grind and a different ingredient mix than the adult concentrate. The new mixer will be an SLHJ2B (stainless steel, 1,000 kg batch capacity) with paddle mixing action, which is better suited to the sticky molasses-based calf starter formulation. The cooperative intends to use the existing mixers for adult concentrate and the new mixer for calf feed, avoiding cross-contamination between products.

Across Pakistan, a feed mixer machine for balanced nutrition feed production is increasingly recognized as a critical investment for livestock development. As smallholder farmers move from traditional feeding methods to formulated rations, the need for reliable, uniform mixing becomes essential. RICHI Machinery supplies the full range of SLHSJ twin-shaft mixers, SLHJ single-shaft paddle mixers, and SLHY ribbon mixers to feed operations throughout South Asia and beyond. For more information or to schedule a consultation on your balanced nutrition feed production needs, contact RICHI Machinery today.