How to produce slow-release fertilizer

As an innovative form of fertilizer, slow-release fertilizer is gradually becoming one of the key factors in modern agricultural production through its unique design and manufacturing process. With its slow and continuous nutrient release characteristics, slow-release fertilizer provides a stable and effective nutrient supply for crops, while reducing nutrient loss and negative impact on the environment.

In the production process of slow-release fertilizer, there are two common forms: powdered slow-release fertilizer and granular slow-release fertilizer. These two forms are slightly different in production methods, but both are designed to achieve the slow release of nutrients to meet the needs of plant growth.

Powdered slow-release fertilizer

Slow-release fertilizer powder is a compound fertilizer product that slowly releases fertilizer through chemical or physical means. Its core technology is to wrap fertilizer particles containing nutrients in a layer of slow-release film. The slow-release film can delay the release of nutrients so that the fertilizer can continue to work, reduce the frequency of fertilization, and reduce fertilizer losses and environmental pollution.

Since slow-release fertilizer powder is a complex chemical product, its powder particles are easy to absorb moisture, resulting in quality degradation. Therefore, attention should be paid to the details of storage and use of powdered slow-release fertilizer to improve the use efficiency of fertilizer.

Slow-release fertilizer granules

The production process of granular slow-release fertilizer mainly includes the screening and preparation of raw materials, mixing, granulation, coating, drying, packaging and other links.

First of all, the raw materials must ensure high purity and stable quality. Common raw materials include compounds such as nitrogen, phosphorus, potassium, as well as fillers, additives, etc. When screening raw materials, impurities must be removed to ensure the purity of raw materials, which is the basis for making high-quality slow-release fertilizers.

The next step is the mixing process. The screened raw materials are mixed in a specific proportion to make the mixed raw materials uniform and easy to granulate later. The mixing time and speed must be strictly controlled to ensure the mixing effect.

Granulation is the process of increasing the viscosity and fluidity of the mixed raw materials by mechanical force, and then granulating them into balls. The spherical raw material particles have high uniformity and are easy to coat and dry.

Coating is a key step in the production of slow-release fertilizers. A layer of polymer or special material is coated on the surface of the spherical raw materials to achieve the effect of slow release of fertilizers. The coating process needs to focus on controlling the coating thickness and uniformity, as well as the selection of coating materials. Appropriate coating materials and uniform coating thickness can ensure the slow-release performance of the fertilizer.

During the drying process, the coated spherical raw materials are dried, usually using a drum dryer. The drying time and temperature must be strictly controlled. Overheating or too long will cause the particles to break and the quality to deteriorate. After drying, the finished slow-release fertilizer can be obtained and packaged for transportation.

In summary, the production process of slow-release fertilizer is a complex and delicate process that requires strict control of parameters and equipment selection in each link to ensure the quality and performance of the final product.