Melt slime granulating composite fertilizer and its production method

Abstract

The granular composite fertilizer consists of urea 45-50 weight portions, potassium chloride or potassium sulfate 20-25 weight portions, ammonium phosphate 20-30 weight portions and stuffing 1-5 weight portions. It is prepared by using high temperature molten urea as carrier to fuse the materials homogeneously and through tower top showering to cool and pelletize. The tower has height of 60-120 m and diameter of 8-20 m. During preparation, water is introduced continuously for adhering to pelletize without caking. The melt composite fertilizer preparing process has the advantages of no material returning, greatly raised production capacity, low power consumption, high apparatus utilization, less environmental pollution, etc.

Description

Technical field

[0001] The invention relates to a melt slurry tower type granulated compound fertilizer and a manufacturing method thereof. It belongs to the field of agricultural fertilizers. Background technique

[0002] At present, various compound fertilizers (mixed fertilizers) used for crops have several problems. The fertilizers are easy to agglomerate when stored, the particles are not smooth, uneven, and the nutrient ratio is unstable, which is not conducive to balanced fertilization of farmland.

[0003] At the same time, the compound fertilizer (mixed fertilizer) produced by the traditional granulation method belongs to simple physical adhesion due to the granulation process, the structure is relatively loose, the fertilizer dissolves and releases quickly, the fertilizer efficiency decomposes and loses quickly, and the fertilizer utilization rate is low. The traditional drying and screening process after granulation consumes a lot of energy. Contents of the inv...

Examples

Embodiment 1

[0020] Embodiment 1: 45 parts of urea, 25 parts of potassium chloride, 25 parts of monoammonium phosphate, 5 parts of filler (dolomite powder);

[0021] Step 1: Melt 45 parts of urea at a high temperature of 130°C, and pump it into the mixing tank at the top of the tower.

[0022] Step 2: After measuring 25 parts of potassium chloride, 25 parts of monoammonium phosphate and 5 parts of dolomite powder, put them into the mixer and mix well.

[0023] Step 3: After the mixed raw materials in step 2 are crushed and screened, they are sent to the tower top silo with a bucket elevator.

[0024] Step 4: Send the mixed material in the silo in step 3 to the mixing heater and heat it to 60°C after passing through the screw feeder.

[0025] Step 5: Send the heated mixed material in the above step 4 into the mixer described in the above step 1, and mix it into a viscous liquid material after rapid stirring. The temperature is controlled at 115°C, and then the overflow goes to the granulat...

Embodiment 2

[0027] Embodiment 2: 48 parts of urea, 24 parts of potassium chloride, 20 parts of diammonium phosphate, 2 parts of filler (talcum powder);

[0028] Step 1: Melt 48 parts of urea at a high temperature of 145°C and pump it into the mixing tank at the top of the tower.

[0029] Step 2: Put 24 parts of potassium chloride, 20 parts of diammonium phosphate, and 2 parts of talcum powder into the mixer and mix well after being measured.

[0030] Step 3: After the mixed raw materials in step 2 are crushed and screened, they are sent to the tower top silo with a bucket elevator.

[0031] Step 4: Send the mixed material in the silo in step 3 to the mixing heater and heat it to 95°C after passing through the screw feeder.

[0032] Step 5: Send the heated mixed material in the above step 4 into the mixer described in the above step 1, and mix it into a viscous liquid material after rapid stirring. The temperature is controlled at 120°C, and then the overflow goes to the granulation nozzl...

Embodiment 3

[0034] Embodiment 3: 50 parts of urea, 20 parts of potassium chloride, 30 parts of triammonium phosphate, 1 part of filler (clay);

[0035] Step 1: Melt 50 parts of urea at a high temperature of 135°C and pump it into the mixing tank at the top of the tower.

[0036] Step 2: After measuring 20 parts of potassium chloride, 30 parts of triammonium phosphate and 1 part of clay, put them into the mixer and mix well.

[0037] Step 3: After the mixed raw materials in step 2 are crushed and screened, they are sent to the tower top silo with a bucket elevator.

[0038] Step 4: Send the mixed material in the silo in step 3 to the mixing heater and heat it to 65°C after passing through the screw feeder.

[0039] Step 5: Send the heated mixed material in the above step 4 into the mixer described in the above step 1, and mix it into a viscous liquid material after rapid stirring. The temperature is controlled at 118°C, and then overflows to the granulation nozzle, Under the rotating cen...

Technical field

[0001] The invention relates to a melt slurry tower type granulated compound fertilizer and a manufacturing method thereof. It belongs to the field of agricultural fertilizers. Background technique

[0002] At present, various compound fertilizers (mixed fertilizers) used for crops have several problems. The fertilizers are easy to agglomerate when stored, the particles are not smooth, uneven, and the nutrient ratio is unstable, which is not conducive to balanced fertilization of farmland.

[0003] At the same time, the compound fertilizer (mixed fertilizer) produced by the traditional granulation method belongs to simple physical adhesion due to the granulation process, the structure is relatively loose, the fertilizer dissolves and releases quickly, the fertilizer efficiency decomposes and loses quickly, and the fertilizer utilization rate is low. The traditional drying and screening process after granulation consumes a lot of energy. Contents of the inv...

Examples

Embodiment 1

[0020] Embodiment 1: 45 parts of urea, 25 parts of potassium chloride, 25 parts of monoammonium phosphate, 5 parts of filler (dolomite powder);

[0021] Step 1: Melt 45 parts of urea at a high temperature of 130°C, and pump it into the mixing tank at the top of the tower.

[0022] Step 2: After measuring 25 parts of potassium chloride, 25 parts of monoammonium phosphate and 5 parts of dolomite powder, put them into the mixer and mix well.

[0023] Step 3: After the mixed raw materials in step 2 are crushed and screened, they are sent to the tower top silo with a bucket elevator.

[0024] Step 4: Send the mixed material in the silo in step 3 to the mixing heater and heat it to 60°C after passing through the screw feeder.

[0025] Step 5: Send the heated mixed material in the above step 4 into the mixer described in the above step 1, and mix it into a viscous liquid material after rapid stirring. The temperature is controlled at 115°C, and then the overflow goes to the granulat...

Embodiment 2

[0027] Embodiment 2: 48 parts of urea, 24 parts of potassium chloride, 20 parts of diammonium phosphate, 2 parts of filler (talcum powder);

[0028] Step 1: Melt 48 parts of urea at a high temperature of 145°C and pump it into the mixing tank at the top of the tower.

[0029] Step 2: Put 24 parts of potassium chloride, 20 parts of diammonium phosphate, and 2 parts of talcum powder into the mixer and mix well after being measured.

[0030] Step 3: After the mixed raw materials in step 2 are crushed and screened, they are sent to the tower top silo with a bucket elevator.

[0031] Step 4: Send the mixed material in the silo in step 3 to the mixing heater and heat it to 95°C after passing through the screw feeder.

[0032] Step 5: Send the heated mixed material in the above step 4 into the mixer described in the above step 1, and mix it into a viscous liquid material after rapid stirring. The temperature is controlled at 120°C, and then the overflow goes to the granulation nozzl...

Embodiment 3

[0034] Embodiment 3: 50 parts of urea, 20 parts of potassium chloride, 30 parts of triammonium phosphate, 1 part of filler (clay);

[0035] Step 1: Melt 50 parts of urea at a high temperature of 135°C and pump it into the mixing tank at the top of the tower.

[0036] Step 2: After measuring 20 parts of potassium chloride, 30 parts of triammonium phosphate and 1 part of clay, put them into the mixer and mix well.

[0037] Step 3: After the mixed raw materials in step 2 are crushed and screened, they are sent to the tower top silo with a bucket elevator.

[0038] Step 4: Send the mixed material in the silo in step 3 to the mixing heater and heat it to 65°C after passing through the screw feeder.

[0039] Step 5: Send the heated mixed material in the above step 4 into the mixer described in the above step 1, and mix it into a viscous liquid material after rapid stirring. The temperature is controlled at 118°C, and then overflows to the granulation nozzle, Under the rotating cen...