Technology for continuously producing nitrocompound fertilizer by using low-grade phosphorus ore and dolomite
Through the continuous process of low-grade phosphate rock and dolomite, combined with high-tower granulation technology, high-efficiency nitro compound fertilizer is made, which solves the problem of lack of nitrate nitrogen and calcium and magnesium in compound fertilizer production and achieves environmental protection and low cost. The production of compound fertilizers improves product uniformity and dissolution speed to meet the nutrient needs of crops.
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Embodiment 1
[0025] The production ratio is N+P 2 o 5 +K 2 O≥20+5+0, Ca≥8, Mg≥2 formula compound fertilizer.
[0026] Calculated according to the production of one ton of compound fertilizer batching reaction production:
[0027] Take 250Kg of phosphate rock, add no more than 35Kg of water for wetting, then add 40Kg of concentrated sulfuric acid with an appropriate fraction of 98% for reaction, and recover and treat the tail gas after the reaction. After about 2 hours, add 160Kg of dolomite, and add no more than 15Kg After about 1 hour, use a pulverizer to crush, then add an appropriate amount of ammonium phosphate, send it to the granulation tower with a bucket elevator, heat the mixture to nearly 80°C, add ammonium nitrate solution in proportion, and control the reaction temperature. 140°C, at this time, the viscosity of the slurry is suitable. It is granulated by a granulator, convected with the air, shrinks into round particles in the tower and falls, collects and cools, and adds an...
Embodiment 2
[0030] The production ratio is N+P 2 o 5 +K 2 O≥20+5+0, Ca≥6 formula compound fertilizer. According to the production of one ton of compound fertilizer batching reaction production:
[0031] Take 350Kg of phosphate rock, add no more than 45Kg of water to moisten it, then add 40Kg of concentrated sulfuric acid to react, recover and treat the tail gas, and discharge the waste gas. After about 2 hours, use a pulverizer to crush it, add an appropriate amount of ammonium phosphate, and send it to Go to the granulation tower, heat the mixture to nearly 80°C, add ammonium nitrate solution in proportion to control the reaction temperature to 150°C, at this time the viscosity of the slurry is appropriate, use a granulator to granulate, form convection with the air, and shrink in the tower Fall into round particles, collect and cool, add anti-caking oil and anti-caking powder, and pack the finished product. The mass percent content of detected N was 20.52%, P 2 o 5 The mass percen...
Embodiment 3
[0033] The production ratio is N+P 2 o 5 +K 2 O≥20+10+0, Ca≥7, Mg≥2 formula compound fertilizer.
[0034] According to the production of one ton of compound fertilizer batching reaction production:
[0035] Take 100Kg of phosphate rock, add no more than 35Kg of water to moisten it, add 40Kg of concentrated sulfuric acid to react, and recover and treat the tail gas. After about 2 hours, add 160Kg of dolomite, add no more than 15Kg of water to moisten it, and after about 1 hour, crush it with a pulverizer, add An appropriate amount of ammonium phosphate is sent to the granulation tower with a bucket elevator, the mixture is heated to nearly 80°C, and ammonium nitrate solution is added in proportion to control the reaction temperature at 160°C. The viscosity of the slurry is suitable, and the granulator granulates to form convection with the air , shrink into round particles in the tower and fall, collect and cool, add anti-caking oil and anti-caking powder, and pack the finis...
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