Twin roll granulator is famous in the fertilizer production industry for dry granulation. It requires the moisture content of the material to be less than 5%. In addition, the roller press granulator is suitable for the production of special compound fertilizers of high, medium and low concern, such as the production of diammonium phosphate, nitrogen, phosphorus and potassium, and urea fertilizers.
In general, a twin roll granulator includes 4 main components.
• The frame part is an integral structure made of high-quality carbon steel plate. All other parts need to be assembled in the rack section. Also, there are holes around the machine. Easy to unload and transport.
• The transmission part refers to the motor drive pulley, V-belt and reducer. This part mainly provides force when the double-roller granulator is working.
• The extrusion granulation part is the key part of the drum granulator. In a complete twin roll granulator there are two rolls which compress the powdered material into large pieces.
• The crushing and separation part is to crush the extruded large flakes into uniform particles. The off-spec fertilizer granules are then separated and need to be returned to the granulation section.
Why choose a twin-roller granulator to produce granular fertilizer?
•Widely applicable to various raw materials. You can not only use twin roll processing machines on npk fertilizer production lines. But it is very applicable in pharmaceutical, chemical, metallurgy, coal, feed and other industries.
• Reduced investment. Extrusion granulators make fertilizer granules at room temperature. So you don’t buy fertilizer dryers and coolers.
• No waste pollution discharge. Our drum granulator uses electricity as the main power. Therefore, the pollution to the environment will be reduced.
• High granulation rate. The ball forming rate of the double-roll granulator is over 90%.
Organic fertilizer manufacturing equipment is needed to make animal manure as organic fertilizer. The performance characteristics of the equipment determine the different uses of the equipment and the pros and cons of the equipment. As we all know, animal manure is a good organic fertilizer, which can make the soil fertile, overcome soil compaction, provide plant nutrition, and improve crop quality. However, how to deal with animal manure must first be fermented and decomposed. Fermentation can promote the decomposition of organic fertilizer and increase fertilizer. The effective ingredients of the fertilizer are fermented at high temperature, insect eggs and weed seeds are used to kill germs and make environmentally friendly organic fertilizer. The organic fertilizer turning machine is a special equipment for fermentation and decomposing. Let’s take you to understand the equipment performance characteristics and process principles of using animal manure as organic fertilizer.
Performance characteristics of animal manure as organic fertilizer equipment
Animal manure organic fertilizer has a kind of organism and enzyme, which can enhance the biological properties and enzyme activity of the soil, increase the nutrient content of the soil, and improve the pH of the soil, so that the soil can be suitable for the growth of various agricultural practices.
The organic fertilizer produced by the pig manure organic fertilizer production line is highly nutritious. If it is put in evenly, no additional fertilizer is needed for at least 100 days. This effect cannot be replaced by any fertilizer.
The animal manure organic fertilizer production line can add anti-disease and insect pests drugs during production to reduce disease and insect pests and rodents.
The organic fertilizer produced by the animal manure organic fertilizer production line is rich in nutrients, and in addition to the three major nutrients of nitrogen, phosphorus and potassium, there are also rich calcium, magnesium and silicon, etc., which change the composition of the soil and are beneficial to crop growth.
①The raw material is fermented, fermented and crushed. After crushing, the sieving machine sieving, the sieving machine sieving out qualified powdery organic fertilizer, then the automatic packaging scale packaging, sealing, and each equipment is transported by a belt conveyor.
Granular organic fertilizer production line equipment:
Fermentation of raw materials: various animal manures such as chicken manure, pig manure, cow manure, biogas residue, or raw materials that can be fermented or have fertilizer efficiency after treatment are equipped in a certain proportion (according to market demand and local soil test results).
Stirring of raw materials: Stir the prepared raw materials evenly to increase the uniform fertilizer efficiency content of the overall fertilizer particles.
Granule drying: The granules made by the granulator are sent to the dryer, and the moisture contained in the granules is dried to increase the strength of the granules and facilitate storage.
Granule cooling: The temperature of dried fertilizer granules is too high and easy to agglomerate. After cooling, it is convenient for bagging and storage and transportation.
Particle classification: The cooled particles are classified, the unqualified particles are crushed and re-granulated, and the qualified products are screened out.
Finished product coating: Coating qualified products to increase the brightness and roundness of the particles.
Finished product packaging: Pack the film-coated particles, that is, the finished product, and store it in a ventilated place.
The organic fertilizer production line of FPC livestock and poultry manure organic fertilizer equipment has reasonable design, fine production, compact appearance, reasonable price, and good after-sales service. It can produce powdered organic fertilizer or hardcover organic fertilizer (that is, granular). The company can specify the equipment required according to the specific situation of the customer, according to your situation to plan the site area, equipment placement, and help you install and debug. Welcome to negotiate and purchase.
Mixing of raw materials: the main material is livestock manure, the ingredients (straw, waste tobacco, planting and processing waste, etc.) are crushed, organic and biological bacterial fertilizers are added, and some phosphate rock powder, potassium ore powder, and phosphate rock can be appropriately added Try to purchase medium-grade phosphate rock (total phosphorus content> 18%). The amount of phosphate rock powder added to the organic fertilizer raw materials needs to consider the pH of the raw materials. More phosphate rock powder can be added to the weakly acidic raw materials, and natural potassium magnesium sulfate fertilizers should be less added to the neutral and slightly alkaline raw materials to adjust the nutrients and carbon of the materials. Nitrogen ratio, carbon to phosphorus ratio, pH value, etc. After treatment, the moisture content of the raw materials is controlled at 60%-65%, and the C/N ratio is 20-30. The production of bio-organic fertilizer needs to add beneficial bacteria and functional bacteria, and it needs to be added when the temperature of the material is less than 40 degrees after the high temperature period of fermentation. The paddle-type compost turning machine can control the materials in the tank in sections, which is convenient for operation, and makes full use of the equipment’s ingredient mixing function, fermentation mixing function, and mixing and drying function to simplify the production process. This process is designed as an integrated workshop for ingredient mixing, fermentation, aging (decomposition), and drying to reduce multiple handling of materials.
Note: In the composition of raw materials before composting, the carbon-nitrogen ratio and moisture of the raw materials are mainly considered, followed by particle size and pH: the reasonable range of carbon-nitrogen ratio: 20:1-40:1, the best range: 25:1- 30:1; reasonable range of moisture content: 40%-65%, optimal range: 50%-60%; reasonable range of particle size: 0.32cm-1.27cm, depending on materials, piles and weather; reasonable pH Range: 5.5-9.0, best range: 6.5-8.0.
Fermentation: Fermentation of organic fertilizer raw materials adopts aerobic fermentation process, adopts trough type fermentation turning machine, and blades (rotating tooth type, positive and reverse) to cut and throw materials, which can make organic materials move backward during turning. Each turn moves backward about 2.2 meters. The turning and throwing machine has a mixing function and can be used as a mixer. During the batching, the layered materials can be mixed evenly and then enter the fermentation area (or fermentation period), which can greatly save the investment in raw material pre-mixing equipment and material loading and unloading transportation and pre-mixing work Mix the broiler manure, cassava residue and 0.15% organic material decomposing agent as evenly as possible, stack 60-80 cm high stacks, turn the stacks once every 2-3 days with a turning machine, and control the temperature during fermentation. Below 70°C, the odorless effect is generally achieved in about 20 days, that is, the fermentation is completely decomposed.
Note: During the composting process, the temperature change is mainly controlled. The complete composting process consists of four stages: low temperature, medium temperature, high temperature and cooling. The compost temperature is generally maintained at 50-60°C, and can reach 70-80°C at the highest point. The process of gradually increasing the temperature of the compost is a process of harmless composting (the temperature of the compost is maintained between 45℃-65℃ for 10 days, and pathogenic bacteria, insect eggs and grass seeds can be killed). When the compost temperature rises above 60℃, keep it for 48 hours to start turning the pile, but when the compost temperature rises above 70℃, turn the pile immediately. Make sure to turn the pile evenly and thoroughly. Try to turn the bottom material to the middle and upper part to fully decompose. The frequency of turning depends on the maturity of the organic fertilizer. The pH is controlled in the fertilizer. In the initial stage of composting, organic acid is generated due to the decomposition of organic matter. decline. At this time, if the acidity is too high (pH<5.3), lime or plant ash can be added at 2%-3% of the weight of the raw materials to neutralize the acidity, destroy the wax on the surface of the organic materials and accelerate the fermentation; in the later stage of composting, due to the accumulation of ammonia, the pH It will gradually increase. When the pH is greater than 8.5, fresh green manure, grass, etc. can be added to decompose and regenerate organic acids and lower the pH.
Air-drying and sieving: transport the fermented raw materials to the outdoor drying yard, and after natural drying, ensure that the water content is below 20%, that is, the air-drying is completed, and the air-dried raw materials are crushed through a crusher and then passed through the screen. Sieve to remove impurities.
Note: It is recommended to properly carry out the secondary fermentation in the post-processing of the compost (before air-drying), especially for the raw materials with a large proportion of livestock and poultry manure in the primary fermentation, so as to prevent the finished fertilizer from being applied to the soil and rapid propagation in the secondary fermentation The microorganisms compete for oxygen with the roots of vegetables, resulting in the phenomenon of burning roots and seedlings.
Inspection and packaging: After the crushed and sieved organic raw materials are inspected (sent for external inspection), they are directly quantitatively packaged, which is the powdery finished organic fertilizer. Granulation by the organic fertilizer granulator is the granular finished organic fertilizer.
Note: Before sending for external inspection, judge whether the finished fertilizer is completely decomposed by the color and smell. The completely decomposed organic finished fertilizer can be applied for external inspection. The incompletely decomposed finished fertilizer needs post-processing (or secondary fermentation). The finished fertilizer that has passed the external inspection can be directly bagged or pelletized and then bagged. The finished fertilizer that does not meet the required nutrient content in the external inspection result needs to be returned to the composting workshop, and high-nutrient content raw materials are added to compost and ferment again.
With the development of environmental protection and organic agriculture, the use of organic wastes to produce organic fertilizers through biological fermentation has been rapidly developed, making the treatment of organic wastes harmless and resourceful. However, most of the organic fertilizer obtained by biological fermentation is coarse powder or irregular small lumps, which is very inconvenient to use, and is particularly unfavorable for large-area machine sowing. Making the coarse powder or irregular small pieces of organic fertilizer obtained by biological fermentation into spherical granular organic fertilizer is the key to solving the problem of large-scale popularization and use of organic fertilizer.
FPC will explain to you how the organic fertilizer production line makes organic fertilizer into pellets. The coarse powder or irregular small pieces of organic fertilizer after biological fermentation are characterized by high water content (30-40%) and looseness ( The bulk density is 0.3～0.4t/m3), and the fiber is much. The existing organic fertilizer in the form of coarse powder or irregular small pieces after biological fermentation is made into spherical granular organic fertilizer.
Some manufacturers use traditional discs or drums to granulate, and need to dry coarse powder or irregular small pieces of organic fertilizer (moisture content <15%) and crush them into very fine powder (greater than 100 mesh) . Then add the binder and inorganic fertilizer, and the addition amount of the binder and inorganic fertilizer in the organic fertilizer cannot be greater than 30%. Although this method can be made into spherical particles, the organic fertilizer in the processing process will be crushed by sufficient precipitation, then be granulated by adding water and then dried, repeated many times, so the processing cost is quite high. Moreover, due to the low density of organic fertilizer, the particle strength is low, which is not conducive to storage, transportation, and machine seeding.
There are also some manufacturers who first dry coarse powder or irregular small pieces of organic fertilizer until the moisture content is only 20-25%. Then, a flat die extrusion granulator or a pair-roll extrusion granulator is used to squeeze the dried organic fertilizer into columnar or oblate spherical particles. Although this method is more convenient to use, the fluidity is still not good, it is not suitable for machine broadcast, and the appearance is poor and the appearance is not good.
Some manufacturers first use flat die extrusion granulatorto squeeze the coarse powder or irregular small pieces of organic fertilizer into short columnar particles (due to high water content and high fiber content, columnar particles also have a certain degree of plasticity). Then, it is polished to form spherical particles, and then the spherical particles are dried, cooled and sieved to obtain qualified particles. In this method, the raw materials do not need to be processed, the moisture sequence is reduced in steps, and the production cost is greatly reduced. However, this method also has some fatal weaknesses, that is, organic fertilizer is easy to arch, easy to block and easy to bond equipment, and at the same time, the output is small and the power consumption of the extrusion process is high.
Therefore, in summary, the organic fertilizer industry urgently needs to introduce a large-yield, low-energy compression granulating equipment to overcome the easy arching, easy blocking, easy bonding equipment, and small output of the traditional granulator. And the shortcomings of high power consumption in the extrusion process.