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COMPOUND fertilizer using N, P and K
NPK fertilizers can be NP, NK, PK or all three NPK components fertilizers. Micronutrients are very often integrated into NPK but their content is low (around 1.0%)
6-20-30 NPK granules
13-13-21 NPK granules
NP, NK, PK, NPK - STEAM GRANULATION
Fertilizer production using steam granulation is applicable for the major part of NP, NK, PK and NPK’s. Steam granulation process has several benefits including large productivity, high efficiency, high size uniformity, high diffusion rate into powders, more favorable thermal balance during drying step (granules are more spherical), easy to use, easy for maintenance. CFIh steam granulation process is a low investment process and also provides high flexibility in use of raw materials: AN, AS, KCl, urea, MAP, DAP, SSP, TSP, limestone, magnesium carbonate, dolomite, etc.
The raw materials are fed in a weighing system made of hoppers fitted with dosing conveyors. Weighed raw materials are collected and sent to the steam granulator. In the granulator, granulation occurs by the contact between solid raw materials, scrubbing water and steam. Exiting the granulator, granules are directed to the dryer drum, the pre-cooler, and the fluidized bed cooler for conditioning and then coated in the coater. Dusty air generated during the process is treated in the scrubber before being released to atmosphere.
References:
12-12-12 NPK granules
15-25-0 NPK granules
NP, NK, PK, NPK – CHEMICAL GRANULATION
Chemical granulation can be used for manufacturing NP, NK, PK and NPK’s fertilizers with different formulas. Chemical granulation technique involves injection of sulfuric acid and/or phosphoric acid inside the granulator drum, as well as injection of steam and ammonia into the rolling particle bed of the drum. Chemical granulation process has several benefits including large productivity, high efficiency, high size uniformity, high diffusion rate into powders, more favorable thermal balance during drying step (granules are more spherical), easy to use, easy for maintenance. CFIh chemical granulation process is a low investment process and also provides a high flexibility in use of raw materials: AN, AS, KCl, urea, MAP, DAP, SSP, TSP, limestone, magnesium carbonate, dolomite, etc.
Raw materials are sent to the chemical granulator in which steam, liquid ammonia, phosphoric acid and/or sulfuric acid (depending on the requested formula) are injected jointly with scrubbing water to form the granules. Exiting the granulator, granules are directed to a dryer drum, a pre-cooler, and a fluidized bed cooler for conditioning and then coated in the coater. Dusty air generated during the process is treated in scrubber before being released to atmosphere.
References:
15-15-15 NPK granules
NP, NK, PK, NPK – PIPE REACTOR GRANULATION
Pipe reactor granulation process allows the production of NP – NK – PK – NPK fertilizers of different compositions in which micronutrients can be added (such as boron, zinc, or copper). The most common formula is NPK 15 – 15 – 15.
Raw materials are sent to the granulator in which an installed pipe reactor receives liquid ammonia and phosphoric or sulfuric acid (depending on the formula). In the pipe reactor, the production of high quality slurry is achieved. Depending on the requested formula, this slurry can be made of MAP, DAP, AS or a mixture of them (depending on the acid(s) used). This mixture is sprayed on the solid raw material and the granulation begins. This technology does not need a pre-neutralizer and can use either solid or liquid ammonium nitrate or urea in the granulator.
Exiting the granulator, granules are directed to a dryer drum, a pre-cooler drum, and a fluidized bed cooler for conditioning and then coated in the coater. Dusty air generated during the process is treated in scrubber before being released to atmosphere.
References:
15-15-15 NPK granules
WATER SOLUBLE FERTILIZERS (WSF) – CUSTOMIZED FERTILIZERS
Raw materials necessary for the NPK production (such as urea, AN, potassium nitrate, MAP, MgN, SOP, AS, filler, etc.) are stored in their corresponding silos. Weighing hoppers are used to send the required mass of each raw materials according to the final product composition. The raw materials are conveyed to a crusher. In some cases, depending on the raw materials and the formulation, the crushing step is not necessary. The uncrushed and/or crushed raw materials fall in another weighing hopper for controlling the flowrate going to the mixer. The mixer is fed with the raw materials and solid or liquid additives. The mixer is designed to have high efficient mixing.
Final products i.e. water soluble fertilizers, exiting the mixer, are sent to a packing section.