Double Shaft Mixer in for Blended Fertilizer Production

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If you are looking for a high-efficiency equipment for mixing fertilizer powder, you may want to consider the double shaft mixer. This is a type of horizontal mixer that can blend both wet and dry ingredients, especially in the fertilizer production process. In this blog post, we will introduce the features, working principle, and maintenance tips of the double shaft mixer for blended fertilizer production.

Features of the double shaft mixer

The double shaft mixer has two opposite spiral blades that can stir and transport the raw materials. It can create a homogeneous mixture regardless of the particle size, shape, and density of the materials. It also has a fast, efficient, and gentle mixing action that can prevent material segregation and damage.

The double shaft mixer has twin bomb-bay door openings that allow for fast and efficient discharging of the mixed materials. It can also be equipped with a spray system above the blades to add water to the materials and remove dust.

The double shaft mixer adopts a cycloid-style reducer that has a compact structure, small footprint, smooth transmission, and low noise. The blades are made of high-quality carbon alloy steel with carburized surface and tungsten carbide coating on the corners, which greatly improves the service life of the blades.

The double shaft mixer can mix raw materials evenly and achieve a high capacity mixing of bulk solids. It is suitable for various organic and inorganic fertilizers, such as compost, manure, NPK, urea, etc.

Working principle of the double shaft mixer

The double shaft mixer is composed of a mixing chamber, two stirring shafts, a transmission device, and a spray system. The mixing chamber is a U-shaped horizontal cylinder with two openings at both ends for feeding and discharging. The two stirring shafts are installed inside the chamber parallel to each other. They have blades with adjustable angles that are engaged with each other. The transmission device drives the two shafts to rotate in opposite directions at a certain speed.

When the raw materials are fed into the mixing chamber from one end, they are lifted by the blades and thrown in different directions. The materials collide and rub with each other and with the inner wall of the chamber, forming a fluidized zone in the center. The spray system can add water or other liquids to adjust the moisture content of the materials. The mixed materials are discharged from the other end of the chamber through the bomb-bay doors.

Maintenance tips for the double shaft mixer

To ensure the normal operation and long service life of the double shaft mixer, it is important to follow some maintenance tips:

– When you use the double shaft mixer for the first time, it should be filled with 40# lubricants and you should replace lubricants after 150-200 hours of working. After then you can replace lubricants every 2000-2500 hours working.
– Regularly add grease to the bearing (3# lithium grease).
– Regularly check the wear of the V-belt and the blade. If they are damaged or worn out, replace them in time.
– Regularly check if there is any abnormal noise or vibration during operation. If there is, stop the machine and find out the cause and solution.
– Regularly clean up the residual materials inside and outside the mixing chamber to prevent blockage or corrosion.
– Do not overload or underload the machine. Keep a proper amount of materials in the mixing chamber according to its capacity.


The double shaft mixer is a useful equipment for blending fertilizer powder in a large scale. It has many advantages such as high efficiency, uniform mixing, low noise, long service life, etc. It can be used for various organic and inorganic fertilizers production. If you are interested in this machine or want to know more details, please feel free to contact us.

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Engineer in fertilizer production and machinery development and research, served in the industry since 2001. All the industrial leading information about the bio, organic, npk, compound fertilizer production technology & equipment, welcome contact.

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