With phosphoric acid, ammonia as raw materials, the use of neutralizer, tubular reactor will be neutral slurry in ammoniation compound fertilizer granulating machine in coating granulation, in the process of production add part of nitrogen and potassium and other substances, then through dry, screening, cooling and get NPK compound fertilizer products, this is the major domestic and international chemical fertilizer company and factory mass production who often use such a fertilizer production method
The advantages of this method can produce ammonium phosphate can also produce NPK fertilizer, but also make full use of the acid, ammonia neutralization thermal evaporation material moisture, reduce the granulation water content and drying load, reduce energy consumption, the advantage of this method is: the scale of production, production with low cost and good quality of product, the product high strength.
In recent years, because our country phosphate industry to raise the level of technology and equipment, wet phosphoric acid as a commodity to enter the market with good conditions, in has the resources and conditions of the regions to establish phosphate base, with commodity phosphate meet other regions in the development of the high concentration of phosphate &compound fertilizer needs, is to form a kind of new train of thought and way, the market demand will promote the industry development, will solve many areas of raw material phosphate demand
2. Solid crumb method
To monomer base fertilizer such as urea and ammonium nitrate, ammonium chloride, ammonium sulphate, ammonium phosphate monoammonium phosphate, dap, coarse whiting, general calcium), potassium chloride (potassium) as raw materials, after smashing to a certain degree of fineness, material in the drum granulator or garden disc granulator rolling in the bed through the humidifying, heating for reunion granulation, in granulating process, conditional still can be in a drum granulator to join a small amount of phosphoric acid and ammonia, to improve fertilizer making conditions.
The sources of the raw materials widely to obtain and processing process more simple, less investment, low production cost, mounting fast, flexible production, the product grade adjustment simple easy, is used widely, the raw materials are solid, for raw materials based on sex is not strong, because is the base fertilizer secondary processing process, so almost nonexistent environment pollution problem
3. Part of the slurry method
In recent years, in the TVA urea, ammonium nitrate half slurry method and aggregate method, on the basis of the development of domestic and using urine or ammonium nitrate solution spray prilling – that is part of the slurry method.
This technology use of urea and ammonium nitrate under high temperature can form the characteristics of high concentration solution (? 95%), because urine or ammonium nitrate solution temperature is high, the solubility, liquid big characteristics, using urine or ammonium nitrate concentrated solution direct injection prilling machine layer, the use of urine or ammonium nitrate solution with liquid and other solid base fertilizer and return families together with coating granulation.
So that we can reduce water or steam quantity added to, reducing granulation materials of water content, as well as to reduce granulation water content, dry load and reduce the purpose of energy consumption