BB Fertilizer Mixer

Equipment introduction

BB fertilizer mixer, also known as Bulk Blending Fertilizer Mixer, is the core mixing equipment of the BB fertilizer (blended fertilizer) production line. Its main function is to physically mix two or more simple fertilizers (such as urea, ammonium phosphate, potassium chloride, etc.) in a set proportion to make a compound fertilizer containing nitrogen, phosphorus, potassium and medium and trace elements. The entire mixing process is physical mixing and no significant chemical reactions occur. Therefore, the equipment structure is relatively simple, the investment cost is low, and the formula adjustment is flexible. It is especially suitable for the personalized needs of soil testing and formula fertilization. The BB fertilizer mixer overcomes the chromatography (segregation) and diversion phenomena of the mixture caused by differences in raw material specific gravity and particle size, significantly improves the batching accuracy, and is an ideal choice for BB fertilizer manufacturers.

Equipment Structure Composition

(I) Drum-Type BB Mixer (Mainstream Pellet-Specific Model)

1. Mixing Drum: 304 stainless steel drum, polished inner wall with no dead corners, built-in guide plates to prevent material from sticking to the wall and leaving residue;
2. Support and Transmission Assembly: Support rollers, drive rollers, variable frequency motor, reducer, driving the drum to rotate at low speed (14~25r/min);
3. Feeding and Discharging Mechanism: Top feed hopper, bottom sealed butterfly valve discharge port, fully enclosed and dustproof;
4. Frame Base: Carbon steel load-bearing frame, equipped with shock-absorbing pads;
5. Electrical Control System: PLC timed mixing, forward and reverse rotation control, and power-off safety protection when the cover is opened;
6. Auxiliary Components: Sealing packing, inspection port, dust removal interface.

(II) Horizontal Double-Spiral BB Mixer (Large-Scale Continuous Production Line Model)

1. U-shaped sealed tank;
2. Double-reverse spiral mixing shaft (gentle blades, no sharp shearing);
3. Drive motor + synchronous reducer;
4. Top feed inlet, bottom fully open discharge door;
5. Spray interface (for adding trace elements to trace liquids);
6. Bearing seal, lubricating oil cup, frequency converter control cabinet.

(III) Vertical Conical BB Mixer (Small Workshop/Soil Testing and Fertilizer Station Model)

1. Conical mixing tank;
2. Double spiral mixing paddle (rotation + revolution three-dimensional mixing);
3. Top feed, bottom butterfly valve discharge;
4. Small motor reduction assembly;
5. Simple timer control.

Common Wear Parts: Sealing packing, roller rubber ring, spiral blades, discharge valve gasket, bearings, guide vanes.

Working Principle of the Equipment

The BB fertilizer mixer operates in both forward and reverse directions, achieving efficient mixing through a special internal spiral mechanism and unique three-dimensional structure:

1. Work Process:

1) Feeding: Raw materials are fed into the top feed inlet of the mixer via a lifting system. 2) Mixing (Forward Rotation): The motor drives the cylinder to rotate clockwise. The internal spiral blades continuously lift, tumble, and drop the material, forming a composite motion of axial and radial directions. Different particles collide and interweave fully in three-dimensional space, achieving uniform mixing. 3) Anti-caking: During the mixing process, the anti-caking device operates synchronously to break up material agglomerations. 4) Discharging (Reverse Rotation): After mixing, the cylinder rotates counterclockwise. The spiral blades push the material to the bottom discharge port, the pneumatic valve opens, and the finished product is discharged at a uniform speed under the push of the spiral belt. 5) Conveying: The mixed BB fertilizer enters the subsequent screening and packaging processes.

2. Core Mechanism: Through the triple action of convection, shearing, and diffusion, raw materials with different specific gravities and particle sizes are rapidly penetrated and evenly distributed, effectively overcoming segregation.

Common Faults, Causes and Solutions

Fault Phenomenon	Root Cause	Standard Solution
Material stratification & uneven nutrient content after mixing	Insufficient mixing time; rotation speed too high/low; worn‑out guide scraper; damp & caked raw materials	Extend mixing time above 5 min; adjust speed to 14‑25r/min; replace guide scraper; crush caked raw materials in advance
Massive particle breakage & coating peeling	Excessive rotating speed; sharp blade edges; heavy impact from feeding drop height	Reduce rotating speed; grind blade edges to round corners; install buffer chute at feeding inlet
Discharge leakage & dust emission	Aged sealing gasket of discharge valve; damaged inspection‑port seal; dust‑removal system failure	Replace sealing gaskets; refill sealing filler; clear blocked dust‑removal pipelines
Motor overload & hard startup	Caked material accumulated inside cylinder; idler jamming; over‑volume feeding	Clean residual materials; remove debris on idlers; strictly feed according to rated capacity, avoid overload
Cylinder shaking & abnormal noise during operation	Broken shock‑absorbing pad; uneven idler wear; loose anchor bolts	Replace shock‑absorbing pads & worn idlers; fasten all anchor bolts and calibrate horizontal level
Continuous high‑temperature & abnormal noise of bearing	Lubricant exhaustion; water ingress; bearing wear	Add lubricant; drain accumulated water, replace waterproof seal; install new bearings
Large‑area material caking inside cylinder	Excessive raw‑material moisture; no polished inner liner; long‑term without cleaning	Control raw‑material moisture below 8%; install stainless‑steel polished liner; clean residual materials weekly

Suitable Raw Materials:

1. Basic Granular Single-Element Fertilizers: Urea, Potassium Chloride, Potassium Sulfate, Monoammonium Phosphate, Diammonium Phosphate, Ammonium Chloride (particle size 2-4mm);
2. Functional Fertilizer Granules: Slow-Release Fertilizer, Controlled-Release Fertilizer, Coated Compound Fertilizer, Organic Fertilizer Granules;
3. Auxiliary Materials: Trace Elements in Granules (Zinc, Boron, Magnesium, Calcium), Humic Acid Granules, Bio-bacterial Granules, Anti-caking Powder;
4. Limitations: Not suitable for highly moist, sticky manure or sludge-like materials (for these, a twin-shaft mixer for organic fertilizers is recommended). Material Characteristics Compatibility: Can mix various granules with a density difference of 0.3-0.5 g/cm³ and a particle size difference of 1-3 mm, without easily separating into layers.

Applications of the Equipment

BB fertilizer mixers have a wide range of applications, mainly concentrated in the following areas:

1. BB Fertilizer/Blended Fertilizer Production (Core Application)

BB fertilizer mixers are specialized mixing equipment for producing BB fertilizer (blended fertilizer), and are also core equipment in compound fertilizer and formulated fertilizer processing lines. They are widely applicable to BB fertilizer processing plants with an annual output of 10,000 to 100,000 tons, formulated fertilizer customization workshops, and soil testing and formula fertilization service stations of large agricultural input dealers.

2. Soil Testing and Formula Fertilization

Based on soil nutrient data and crop nutrient requirements in different regions, the nitrogen, phosphorus, and potassium ratio can be adjusted in real time to produce various specifications of specialized fertilizers, such as general-purpose (15-15-15), high-nitrogen (28-6-6), and high-potassium (16-8-24), meeting the personalized nutritional needs of different crops such as corn, wheat, fruit trees, and vegetables.

3. Functional BB Fertilizer Production

Functional BB fertilizers can be produced by uniformly coating or mixing trace elements such as zinc, boron, and molybdenum onto the surface of granules using a premixed carrier.

4. Other Industries The BB fertilizer mixer can also be used for mixing materials in industries such as fertilizer, pharmaceuticals, food, mining, and dry powder. It is suitable for mixing two or more fertilizers and premixes.

Application in Production Line The BB fertilizer mixer serves as the core hub of the BB fertilizer production line. It receives materials from the batching process, completes physical blending of granular materials, and delivers finished materials to the packaging section.

1. Process Flow

After being discharged from the storage silo, the raw materials enter the automatic batching system for precise metering, and are then conveyed by a belt conveyor to the BB fertilizer mixer for uniform mixing. The mixed material is discharged through the discharge port and enters the quantitative packaging machine for weighing and packaging, then is sealed by an automatic sewing machine, and finally transferred by the finished product belt conveyor to the finished product stacking area for storage. The entire process realizes continuous automated operation from batching and mixing to packaging and stacking.

1. Production Line Mode Comparison Table

Production Type	Core Features	Capacity	Floor Space	Typical Configuration
Continuous Production (SG Series)	Continuous feeding and continuous discharging, real‑time online mixing, short material residence time, high output, suitable for large‑scale production	40‑100 t/h	Occupies about 4m × 23m	Large and medium‑sized fertilizer plants, configured with automatic batching and conveying systems
Batch Production (WZL Series)	Batch feeding and batch discharging, stable mixing quality, flexible formula switching, suitable for multi‑variety production	10‑25 t/h	Requires smaller equipment footprint, lower workshop height	Small and medium‑sized fertilizer plants, configured with manual or semi‑automatic batching systems

The BB fertilizer mixer can link with automatic packing machines to realize full‑process automation of batching‑blending‑packaging. It features low operation threshold; ordinary workers can operate the equipment after simple training.

Equipment Operation and Maintenance Methods

1. Daily Operating Procedures:

1) Pre-start Inspection: Confirm that the power supply (380 VAC ±10%) and air supply (0.5 ± 0.1 MPa) are normal; check that all fasteners and seals are intact; confirm that there are no foreign objects inside the drum. 2) Parameter Setting: Set the formula ratio, mixing time (usually 3–5 minutes/batch), speed, and other parameters via the touch screen. 3) Start-up Sequence: Start the dust removal system first → feeding system → batching system → mixer → packaging system. 4) Operation Monitoring: Observe the equipment’s operating status, paying attention to abnormal vibration, unusual noise, or temperature rise. 5) Shutdown Sequence: Stop the feeding system first → stop the mixer after the material inside the drum is emptied → finally turn off the main power supply.

2. Maintenance and Upkeep Points:

Maintenance Item	Cycle	Maintenance Content
Lubrication	Weekly	Regularly add lubricating oil/grease to reducer, bearings and gears.
Sealing Inspection	Weekly	Check cylinder joint surface and discharge port sealing to prevent material leakage.
Blade Inspection	Monthly	Check wear condition of mixing blades, replace high‑wear‑resistant alloy blades in time.
Electrical System	Monthly	Inspect PLC, sensors and circuit connections; clean dust inside control cabinet.
Overhaul	Yearly	Complete disassembly, inspection and maintenance for reducer, motor and cylinder.

Target Customers for the Equipment:

1. BB Fertilizer/Blended Fertilizer Manufacturers: The core customer group for BB fertilizer mixers is BB fertilizer (blended fertilizer) manufacturers, widely applicable to BB fertilizer processing plants with an annual production capacity of 10,000 to 100,000 tons.
2. Formula Fertilizer Customization Workshops and Agricultural Input Distributors: Large agricultural input distributors’ soil testing and formula fertilization service stations need to flexibly formulate different BB fertilizer formulas based on soil test results.
3. Compound Fertilizer and Blended Fertilizer Manufacturers: The equipment is designed to support compound fertilizer and formulated fertilizer processing lines.
4. Small and Medium-Sized Fertilizer Processing Plants: BB fertilizer mixers are suitable for mass production in small and medium-sized fertilizer processing plants. They can flexibly adapt to different production capacities and formulas of BB fertilizer, covering all scenarios from small and medium-sized processing plants to large-scale agricultural input enterprises.
5. Agricultural Input Workshops and Township Fertilizer Distributors: Small BB fertilizer mixers are mobile and require no fixed installation; they can be started simply by plugging in a power source. They are suitable for use in agricultural input workshops and small planting bases, allowing a single person to complete the entire process of feeding, mixing, and discharging.
6. Family Farms and Planting Bases:Can be used for compounding and mixing BB fertilizer raw materials, and blending compound fertilizer formulations.

7. Selection Recommendations

1) Small Users (Agricultural Input Workshops, Family Farms): Choose batch-type small models (ZYC-1250, etc.), which are easy to operate and flexible to move. 2) Medium Users (Small and Medium-sized Fertilizer Plants): Choose models with a batch capacity of 500kg-1000kg or an hourly output of 5-10 tons. 3) Large Users (Large-scale BB Fertilizer Plants): Choose continuous production lines with an hourly output of 10-30 tons, equipped with a fully automatic batching and packaging system. 4) High Requirements for Particle Protection: Prioritize drum mixers, which offer the gentlest mixing and the lowest breakage rate. 5) Frequent Switching Between Multiple Formulas: Prioritize models equipped with a PLC automatic control system and thorough unloading with no residue.

Installation Technical Requirements:

1. Drum type: The horizontal error of the drum installation ≤ 0.5/1000, and the height of the support rollers on both sides is consistent to prevent the drum from running off-center;
2. Horizontal double-ribbon type: The coaxiality of the two main shafts meets the standard, there is no jamming when turning the machine under no-load, and shock-absorbing pads are installed at the bottom of the frame;
3. After all the anchor bolts of the machine are tightened, manually test run for 3-5 minutes. Production can only begin if there is no abnormal vibration or noise;
4. The feed elevator and the mixer feed inlet are sealed together, and a dust collection pipeline is provided to collect dust under negative pressure;
5. The electrical control system should be properly grounded and waterproofed, and placed in a dry and ventilated operating room.