Process and device for preparing potassium ammonium polyphosphate containing chelated medium trace elements
A technology of medium and trace elements, potassium ammonium polyphosphate, applied in ammonium orthophosphate fertilizers, fertilization equipment, alkaline orthophosphate fertilizers, etc., can solve the problems of high raw material requirements and high raw material costs
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Embodiment 1
[0050] see figure 1 , the present embodiment discloses a preparation process of potassium ammonium polyphosphate containing trace elements in a chelated state, comprising the following steps:
[0051] Step 1: Add phosphoric acid, urea, potassium, and medium and trace element additives into the reactor, and stir and react at 60-90°C for 10-60 minutes to obtain a reaction slurry;
[0052] Among them, when stirring, the stirrer is made of carbon steel lined with polytetrafluoroethylene, and the jacket of the stirring equipment is kept warm. The heat source of the jacket can be steam, hot water, or heat transfer oil to improve the stirring effect;
[0053] Step 2: Add the reaction slurry obtained in step 1 into a polymerization curing device with an absolute pressure of 1-70Kpa, control the temperature of the slurry material at 140-220°C, dry and solidify the slurry into a solid material after 20-90 minutes, and control the drying and curing The polymerization rate of phosphorus ...
Embodiment 2
[0071] see Figure 1-Figure 4 , this embodiment discloses a preparation device for potassium ammonium polyphosphate containing trace elements in a chelated state, including a stirring device for stirring materials, a polymerization curing device 1 connected with the stirring device and used for solidifying the materials, and using Cooling device 2 and crushing device 3 for cooling and crushing the solidified material,
[0072] Polymerization solidifier 1 comprises cylinder body 4, is arranged in cylinder body 4 and is used for the distributor 5 that is connected with described stirring device, is arranged in cylinder body 4 and is used for the belt feeding assembly 6 of conveyor belt curing material, is arranged in belt feeding The cutter 7 at the end of the component 6, the heating component 8 arranged in the cylinder 4 and the vacuum suction component 9 communicated with the inside of the cylinder 4;
[0073] Wherein, the distributor 5 is positioned above the end of the bel...
Embodiment 3
[0085] This embodiment is further optimized on the basis of Embodiment 2. In this embodiment, there are several belt feeding assemblies 6 which are misplaced from top to bottom, and the materials on the previous belt feeding assembly 6 can fall behind. On one belt feeding assembly 6 , each belt feeding assembly 6 corresponds to a cutter 7 .
[0086] In this way, after the material is cut and scraped by the cutter 7, the material on the previous belt feeding assembly 6 can drop on the next belt feeding assembly 6, prolonging the running path of the material in the cylinder 4 and prolonging the curing and drying time. Time, improve curing and drying effect.
[0087] In a possible design, the cutting knife 7 on the lowermost belt feeding assembly 6 includes a first cutting knife 23 and a second cutting knife 24, and the first cutting knife 23 and the second cutting knife 24 are obliquely arranged on the belt feeding Above the component 6 , a material channel is formed between th...
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