How to Produce Bulk Blending Fertilizer (BB Fertilizer)

Bulk blending fertilizer (BB fertilizer) is a commonly used type of fertilizer,

typically composed of a specific proportion of nitrogen (N), phosphorus (P),

and potassium (K) fertilizers. In agricultural production,

the use of BB fertilizer can effectively increase crop yield and

quality while also improving soil structure and fertility.

The basic production process of simple bulk blending fertilizer (BB fertilizer) is as follows:

I. Key Equipment List (Corresponding to the Production Process)

Feeding Port / Raw Material Receiving and Preliminary Screening Equipment —

High-strength stainless steel feeding grates and fine sieves are used to receive bulk raw materials

and to filter out impurities and coarse particles at the initial stage.

Intelligent Batching Scale (Batching Machine) —

A digital weighing and distribution system that enables precise feeding of multiple components,

micro-ingredient dosing, and adjustable feeding speed.

It supports multiple weighing and control modes.

Bucket Elevator (Material Conveying) —

Used to lift raw materials from ground storage bins to the upper batching or mixing point.

Suitable for conveying granular or powder materials.

Horizontal Double-Ribbon Mixer (Main Mixing Machine) —

Adopts a twin-ribbon, twin-cone, or twin-

shaft mixing structure. The mixing volume and effective loading are selected based

on material characteristics (typical models have a total volume of 0.7–1.0 m³,

an effective volume of 0.4–0.7 m³, and a single-batch capacity of about 400 kg).

Single-Station Packing Scale (or Multi-Station Packing System) —

Performs automatic weighing, bag-making, filling, and sealing,

combined with a conveying and bag-palletizing line.

Automatic Control System (PLC / IPC) —
Centrally controls the weighing, feeding, mixing, discharging, and packaging processes.

Supports formula management, alarm functions, and data recording.

Auxiliary Equipment: Pulse Dust Collector, Storage Hopper, Conveyor Belt,

and Safety Protection Devices —
Used for dust control, ensuring environmental protection in the workshop

and operational safety for workers.

II. Detailed Production Process

1. Raw Material Receiving and Inspection
Receive raw materials such as urea, phosphate fertilizer, potash fertilizer, ammonium sulfate,

trace element packages, or functional additives from suppliers.
Through the feeding port, stainless steel grates and fine sieves are used to filter out large impurities

and foreign materials. Moisture content, particle size, and impurity levels are inspected,

and batch information is recorded.

2. Intelligent Batching and Accurate Weighing
According to the set formula, parameters for major and micro ingredients

are called up in the batching control system.
Bulk materials are fed rapidly, while micro ingredients are dosed using high-precision feeders

or vibrating feeders to ensure weighing accuracy

within the range of 0.1%–1% (depending on process requirements).
The system supports multi-stage weighing strategies,

enabling the cumulative weighing of multiple components in a short period of time.

3. Lifting and Uniform Conveying
A bucket elevator or belt conveyor is used to transfer the weighed raw materials

to the upper section of the mixer or storage hopper.
During conveying, material clumping, segregation,

or moisture absorption must be avoided to ensure consistent feed quality.

4. Horizontal Double-Ribbon Mixing
All components are loaded into the horizontal double-ribbon mixer either simultaneously or in stages.

The twin-ribbon structure enables strong convection and shear mixing, achieving a high level of uniformity.
Mixing time and rotation speed are set according to the bulk density and blending characteristics of the materials.

Typically, the process is short and efficient

(for example, models with an effective volume of 0.4–0.7 m³ can mix about 400 kg per batch).
During mixing, visual inspection or sampling can be performed to check blending uniformity,

and mixing duration can be adjusted if necessary.

5. Discharging, Temporary Storage, and Packaging
After mixing is complete, the discharge gate at the bottom of the mixer opens,

allowing the blended material to flow directly into the packing scale or an intermediate storage hopper.
The packing scale automatically weighs, fills, and seals each bag according to preset parameters.

Packaging speed depends on the number of packing stations.

A single-station packing scale is suitable for medium and small-scale production,

offering easy maintenance and quick bag size changes.
Finished products are stored in the warehouse with batch labels and quality inspection reports attached.

6. Automated Control and Data Management
The PLC/IPC system controls the entire process, including start/stop operations,

cumulative weighing, alarm handling, and formula switching.
It automatically records formula batches, weighing data, mixing time, and error logs,

allowing for complete traceability and quality analysis.

III. Quality Control and Inspection Key Points

Formula Consistency:
Each production batch must use electronic formula management to prevent human input errors

and ensure accurate ratio control.

Weighing Accuracy:
Trace elements and functional additives should be measured and weighed separately,

as they require higher precision levels.

Mixing Uniformity:
Regular sampling should be conducted to test nutrient content or particle size distribution,

ensuring that the deviation from the target ratio remains within the allowable range.

Moisture and Caking:
Control both raw material and environmental humidity. When necessary,

apply drying or moisture-proof measures to prevent caking,

which could affect the fertilizer’s dispersibility.

Dust and Contamination:
Equip the production line with a pulse dust collector and sealed conveying system

to minimize dust emission and cross-contamination in the workshop.

Bulk blending fertilizer production is a systematic process that

requires high standards in formula management,

weighing accuracy, and mixing uniformity. By properly selecting intelligent batching machines,

bucket elevators, horizontal double-ribbon mixers, automatic packing scales,

and reliable PLC/IPC automated control systems, it is possible to build an efficient,

stable, and fully traceable BB fertilizer production line.

Combined with strict quality inspection and environmental safety measures,

small and medium-sized fertilizer plants can ensure product quality while steadily

improving production capacity and market competitiveness.