Dry Type Roller Press Granulation Machine_ The Core Equipment for Efficient De-icing Salt Production

Product Introduction:

       Dry roller press granulators are total workhorses for de-icing salt production! They churn out de-icing salt pellets that have consistent size, great hardness, and don’t clump up easily at all. These machines use a closed-chamber granulation method—super eco-friendly with zero dust release. Plus, they combine granulation, crushing, and screening all in one, so you won’t have to splurge on extra equipment.

Main process of producing de-icing salt using a dry roller press granulator

        Dry roller pressing granulation tech cuts out the old-school wet granulation process entirely! It doesn’t need any water, no binders, and you won’t even need a separate drying system afterward—instead, it gets dry granulation done just by using the mechanical squeezing force between two rollers that spin in opposite directions. That’s why it’s perfect for de-icing salt’s physical traits, like how it dissolves easily and is sensitive to moisture. Here’s its main workflow, broken down into four key steps:

1.1 Material Pretreatment

First, the raw material, de-icing salt (usually in powder form with a particle size ≤0.5mm ), is fed into the feed hopper. Before entering the granulation system, the powder needs to be screened by a drum screen or vibrating screen to remove impurities and lumps, ensuring the uniformity of the raw material.

1.2 Forced feeding

The pretreated de-icing salt powder is conveyed to the granulator by a uniform forced feeder embedded in a buffer hopper . The forced uniform feeder has a stable and uniform feeding pressure, ensuring that the powder is continuously and evenly distributed between the two rollers.

1.3 Roller extrusion granulation

This is the core stage of the entire roller granulation production line . Two counter-rotating rollers rotate at a constant speed (adjustable from 5-15 rpm). Uniformly shaped concave dies are engraved on the rollers. After the de-icing salt powder is pressed into the dies by the rollers, it is extruded under high pressure (typically 15-30 MPa) into dense, flattened spherical granules or flake-like semi-finished products. The extrusion pressure can be adjusted according to the hardness requirements of the final de-icing salt granules—the higher the pressure, the harder the granules and the better the anti-caking performance. The processed granule shape can be customized, such as oval , square , or irregular shapes , with a diameter of 2-10 mm (customizable according to requirements).

1.4 Granulation and Sieving

are crushed by a crushing mechanism , then screened by a vibrating screen located below the roller press granulator chamber, and discharged from the outlet. This closed-loop system ensures a granulation rate of over 98 % , improving production efficiency .

(Graphic:Complete Zinc Sulfate Granule Production Line)

2. Zinc Sulfate Granule Production Equipment - Main Applications of the Double-Roller Extrusion Granulator:

Dry roller press granulators are characterized by energy saving, environmental protection, high granule hardness, and high efficiency .

2.1 Energy saving and environmental protection

•  No binder required: De-icing salt exhibits excellent plasticity during extrusion, thus eliminating the need for chemical binders (such as polyvinyl alcohol). This not only reduces production costs but also ensures the purity of the de-icing salt (avoiding the problem of binder residue affecting melting efficiency).

•  Low dust emissions: The entire process is carried out in a closed system (equipped with a dust collector), and the dust concentration in the workshop is controlled below 10 mg/m³.

2.2 High particle quality

•  Uniform particle size: The mold on the roller ensures that each particle has a consistent shape and size, with a particle size uniformity exceeding 90%. Particles with uniform size are easier to spread during use, avoiding uneven melting caused by excessively high or low local salt concentrations.

•  High hardness and anti-caking properties: The bulk density of the extruded granules is 1.2-1.5 g/cm³, and the compressive strength is 5-15 N. They are not easily broken during transportation and storage, and have strong anti-caking properties (even in a humid environment, the agglomeration rate is less than 5% after 3 months of storage).

2.3 High production efficiency and simple operation

•  High output: The equipment has a variety of output options, from 0.5 tons/hour (small laboratory model) to 20 tons/hour (large industrial model), which can meet the production needs of small, medium and large de-icing salt enterprises.

•  Easy maintenance: Core components (rollers, screws, etc.) are made of corrosion-resistant and wear-resistant materials (such as 304 stainless steel or wear-resistant alloy steel), with a service life of over 5000 hours. The equipment adopts a modular design, and the rollers can be replaced within 1-2 hours, reducing maintenance downtime.

2.4 Strong adaptability

•  It can adapt to a variety of raw materials: In addition to common de-icing salts (such as sodium chloride, calcium chloride, and magnesium chloride), the machine can also granulate and mix de-icing salts (such as sodium chloride + calcium chloride) and de-icing salt additives (such as preservatives), enabling the production of multiple products from a single machine.

•  It has strong adaptability to the moisture content of raw materials: the optimal moisture content of de-icing salt powder raw materials is 2-8% (15-25% is required for wet granulation). Even if the moisture content of the raw materials fluctuates slightly (within the range of 1-10%), the machine can still maintain stable granulation quality, reducing the difficulty of raw material storage and pretreatment.

Production Process:

01. Feeding: The raw materials are fed into the next stage, ensuring a steady and uniform supply that maintains the continuity of the production process.
02. Crushing: The raw material is crushed to reduce particle size, facilitating more efficient mixing and granulation.
03. Mixing: The crushed raw material is thoroughly blended with other additives to ensure a consistent and uniform formula.
04. Granulation: The mixed raw material is processed into Granules by a granulator.
05. Screening: The screening machine separates any oversized or undersized granules, ensuring uniformity in granule size.
06. Drying: The granules with high humidity are reduced by the dryer to improve the strength and stability of the granules.
07. Cooling: The dried granules are cooled to reduce their temperature and prevent them from deforming or sticking during storage and packaging.
08. Screening: Remove too large or too small granules through the screening machine to ensure uniform granule size.
09. Packageing: The qualified granules are packed according to the specifications for easy transportation and storage.

Technical Parameters:

Applications:

1.Agriculture – Ideal for producing NPK compound fertilizers and specialty fertilizers to meet different crop needs.

2.Industry – Efficient granulation of various chemical powders for reliable processing.

3.Customization – Can be tailored to produce soil conditioners and special formula fertilizers for specific requirements.

Finished Granules Display:

Project Cases:

Over the years, our fertilizer production lines have been successfully installed in more than 200 projects worldwide, covering Asia, Africa, Europe, and South America. Each project is designed based on the customer’s raw materials, capacity needs, and local conditions, ensuring reliable performance and long-term operation.

Our case studies include large-scale NPK compound fertilizer plants, organic fertilizer lines using animal manure, and customized solutions for specialty fertilizers. These projects not only demonstrate the efficiency of our equipment but also highlight our ability to provide tailor-made solutions and complete after-sales support for global clients.

After-Sales Service:

FAQ:

Q1: What types of finished products can this fertilizer production line produce?
A1: Our production line can produce various types of granules such as organic fertilizer, compound fertilizer, andblended fertilizer. The production capacity, granule shape, and size can be customized according to customerrequirements.

Q2: What raw materials is the production line suitable for?
A2: It can process a variety of organic and inorganic materials such as animal manure, compost, agricultural waste,chemical powders, and phosphate rock powder.

Q3: I know little about the fertilizer production line. How to choose the most suitable machine?
A3: Just tell us your raw materials, capacity (tons/hour), and the size of the final granule product, and we willrecommend the suitable machine for you based on your specific situation.

Q4: How can I know my raw material is suitable for your machine?
A4: If we can buy the same raw material from our market, we wil test the machine, then send the video and show thefinal effection. If we can't buy it from our market, you can send it to our company, then we will arrange to testmachine for you.