FPP grinding
FPP mill is mainly used for pre grinding of cement clinker. This equipment was included in the 2014 National Key Energy saving and Low carbon Technology Promotion Catalogue 122 "New Energy saving Technology for Pre grinding of Cement", and has obtained 21 patents. It has been listed as a new product in Jiangsu Province, a national torch plan project, and a national key new product....
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Product Details
FPP mill is mainly used for pre grinding of cement clinker. This equipment was included in the 2014 National Key Energy saving and Low carbon Technology Promotion Catalogue 122 "New Energy saving Technology for Pre grinding of Cement", and has obtained 21 patents. It has been listed as a new product in Jiangsu Province, a national torch plan project, and a national key new product.
2、 FPP Grinding Process
1. Slag pre grinding system
1.1 The main unit of the slag pre grinding system consists of FPP mill, coarse material classifier, and ball mill.
Explanation: When using this grinding system, the moisture content of the slag is ≤ 2%. After FPP grinding, the discharge particle size ≤ 1mm reaches 99%, so there is no need for sorting equipment. The grinding output of FPP grinding exceeds that of ball mill, and some materials can be returned to the mill for grinding through a classifier, thus achieving full load operation of FPP grinding.
1.2 Operating conditions: 1.2.1 The moisture content of the slag ground in FPP should be ≤ 3%, and the ideal cement should be controlled between 1-2%.
1.2.2 In the process flow, multiple iron removers must be used for iron removal, and metal detectors must be used for fault alarm and shutdown handling.
1.2.3 The temperature entering the FPP mill must be ≤ 50 ℃.
1.2.4 The feeding system must achieve uniform and continuous feeding.
2. Cement pre grinding system:
2.1 Main equipment of cement pre grinding system
FPP mill+coarse powder classifier (FPS edge classifier/ZLS self retained vibrating screen)+ball mill constitute the pre grinding equipment.
2.2 Operating conditions:
2.2.1 The comprehensive moisture content of materials entering FPP should be ≤ 3%, and the ideal comprehensive moisture content should be controlled below 1%.
2.2.2 Slag cement must use multiple iron removers and metal detectors.
The temperature entering the FPP mill must be ≤ 30 ° C.
2.2.4 The feed particle size is clearly specified in the FPP grinding number parameter table.
2.2.5 The feeding system must achieve uniform and continuous feeding.
1. FPP mill 2, coarse powder classifier 3, elevator 4, ball mill 5, dust collector 6, fan
3. FPP combined grinding process system
The main equipment of the FPP mill combined grinding process system is composed of: FPP mill+coarse powder classifier+powder selector+ball mill+dust collection equipment.
3.2 Material classification is an important part of energy saving and consumption reduction in combined grinding. Under good working conditions, the material is ground by FPP grinding, and more than 65% of the powder is less than 2mm. The powder less than 2mm is separated from the mixture by a classifier; Materials larger than 2mm are returned to the FPP mill for re grinding, solving the problem of over grinding in the FPP mill. Coarse powder larger than 2mm is used as filling material for FPP mill to increase material density, stabilize the material bed, and improve the grinding efficiency of FPP mill
Rate.
3.3 Powder less than 2mm contains 45% of cement finished products, which are selected by a powder selection machine and transported to the finished product warehouse after separation. Coarse materials enter the ball mill for further grinding, solving the problem of over grinding in the ball mill and improving the grinding efficiency of the ball mill.
3.4 After passing through the FPP mill, the material is classified by a classifier, and 30% (>2mm) of the coarse particles are returned to the FPP mill for further grinding. 70% (<2mm) enter the powder selection machine for powder selection, reducing the feeding amount and circulating load of the powder selection machine. The selection of powder selection machine and fan models is reduced, thereby saving energy consumption and equipment investment in air selection.
The output of the 3.5FPP combined grinding system has been increased by over 100%, achieving the optimal effect of increasing production and reducing consumption.
3、 Advantages of FPP Grinding System:
1. The FPP mill first pre grinds the clinker, and after pre grinding, the particles are crushed by rolling and shearing, resulting in a very small particle size,
And there are many cracks, among which 30% are less than 88 μ m. After entering the ball mill, the mixture creates good grinding conditions for the ball mill, greatly improving the grinding capacity of the system. Generally, cement production increases by more than 70% and saves about 30% of electricity.
2. It can improve the compressive strength of products and mortar, thereby enhancing the quality of cement products.
3. During operation, there is no vibration, no steel impact sound, low noise, and meets environmental protection requirements.
4. The FPP mill adopts dynamic and static rings to ensure the thickness of the material layer. The gap between the dynamic and static rings can be easily adjusted outside the FPP mill by adjusting the device according to the fluidity of the material, so as to adapt to the fluidity of the material and ensure the thickness of the material layer.
5. The FPP mill is equipped with an inclined internal screening device inside the mill. The escaping large blocks are blocked by the screening device and returned to the mill for rolling and grinding. The maximum discharge particle size of the FPP mill is less than 6mm, with over 65% of the particles being less than 1mm.
6. The FPP mill is designed with a simple dust collector on the top cover, which is used to evaporate the moisture of the material into water vapor during the grinding process and discharge it into the air. The dust is separated from the airflow and falls into the hopper of the dust collector by changing the airflow velocity. The heavy hammer flap valve is opened to discharge the dust into the mill.
7. Based on the characteristics of grinding efficiency, it is convenient to select the gap of the sieve to determine the particle size entering the ball mill, thereby increasing the output of the ball mill.
8. The FPP mill effectively controls the particle size of the returned material within 1-6mm through internal and external screening, improves the filling rate, increases the specific gravity and density of the material, solves the problem of over grinding, stabilizes the material bed, increases pressure capacity, and improves grinding efficiency.
9. The FPP grinding process is relatively simple, using a classifier instead of a powder selector, resulting in fewer auxiliary equipment, lower investment, and lower energy consumption.
10. The output material of FPP mill is screened, and the fine powder after screening enters the ball mill, effectively controlling the particle size of the material entering the ball mill, making the ball distribution of the ball mill tend towards miniaturization, with large balls turning into small balls and small balls becoming finer and finer, thus greatly improving the grinding efficiency of the ball mill.
4、 Compared with roller press machine
1. Material fineness
One is FPP grinding (fixed bed), whose finished product has a specific surface area of generally 180-240m2/kg
The second is the roller press (fluidized bed), whose finished product has a specific surface area of generally 110-230m2/kg
2. Energy consumption
Figure 1 shows that the domestic roller press is constrained by hardware such as bearings and hydraulic components, and operates at a reduced pressure of 8MPa during operation, resulting in pre ground products with a specific surface area of 100-140m2/kg. In order to achieve a pre grinding specific surface area of 180m2/kg under domestic supporting conditions, the designers further increased the roller press to significantly increase its installed power to 15kWh/t cement (FPP grinding installed power is 7kwh/t), resulting in a significant increase in power consumption.
3. FPP combined grinding process system
The main equipment of the FPP mill combined grinding process system is composed of: FPP mill+coarse powder classifier+powder selector+ball mill+dust collection equipment.
3.2 Material classification is an important part of energy saving and consumption reduction in combined grinding. Under good working conditions, the material is ground by FPP grinding, and more than 65% of the powder is less than 2mm. The powder less than 2mm is separated from the mixture by a classifier; Materials larger than 2mm are returned to the FPP mill for re grinding, solving the problem of over grinding in the FPP mill. Coarse powder larger than 2mm is used as filling material for FPP mill to increase material density, stabilize the material bed, and improve the grinding efficiency of FPP mill
Rate.
3.3 Powder less than 2mm contains 45% of cement finished products, which are selected by a powder selection machine and transported to the finished product warehouse after separation. Coarse materials enter the ball mill for further grinding, solving the problem of over grinding in the ball mill and improving the grinding efficiency of the ball mill.
3.4 After passing through the FPP mill, the material is classified by a classifier, and 30% (>2mm) of the coarse particles are returned to the FPP mill for further grinding. 70% (<2mm) enter the powder selection machine for powder selection, reducing the feeding amount and circulating load of the powder selection machine. The selection of powder selection machine and fan models is reduced, thereby saving energy consumption and equipment investment in air selection.
The output of the 3.5FPP combined grinding system has been increased by over 100%, achieving the optimal effect of increasing production and reducing consumption.
3、 Advantages of FPP Grinding System:
1. The FPP mill first pre grinds the clinker, and after pre grinding, the particles are crushed by rolling and shearing, resulting in a very small particle size,
And there are many cracks, among which 30% are less than 88 μ m. After entering the ball mill, the mixture creates good grinding conditions for the ball mill, greatly improving the grinding capacity of the system. Generally, cement production increases by more than 70% and saves about 30% of electricity.
2. It can improve the compressive strength of products and mortar, thereby enhancing the quality of cement products.
3. During operation, there is no vibration, no steel impact sound, low noise, and meets environmental protection requirements.
4. The FPP mill adopts dynamic and static rings to ensure the thickness of the material layer. The gap between the dynamic and static rings can be easily adjusted outside the FPP mill by adjusting the device according to the fluidity of the material, so as to adapt to the fluidity of the material and ensure the thickness of the material layer.
5. The FPP mill is equipped with an inclined internal screening device inside the mill. The escaping large blocks are blocked by the screening device and returned to the mill for rolling and grinding. The maximum discharge particle size of the FPP mill is less than 6mm, with over 65% of the particles being less than 1mm.
6. The FPP mill is designed with a simple dust collector on the top cover, which is used to evaporate the moisture of the material into water vapor during the grinding process and discharge it into the air. The dust is separated from the airflow and falls into the hopper of the dust collector by changing the airflow velocity. The heavy hammer flap valve is opened to discharge the dust into the mill.
7. Based on the characteristics of grinding efficiency, it is convenient to select the gap of the sieve to determine the particle size entering the ball mill, thereby increasing the output of the ball mill.
8. The FPP mill effectively controls the particle size of the returned material within 1-6mm through internal and external screening, improves the filling rate, increases the specific gravity and density of the material, solves the problem of over grinding, stabilizes the material bed, increases pressure capacity, and improves grinding efficiency.
9. The FPP grinding process is relatively simple, using a classifier instead of a powder selector, resulting in fewer auxiliary equipment, lower investment, and lower energy consumption.
10. The output material of FPP mill is screened, and the fine powder after screening enters the ball mill, effectively controlling the particle size of the material entering the ball mill, making the ball distribution of the ball mill tend towards miniaturization, with large balls turning into small balls and small balls becoming finer and finer, thus greatly improving the grinding efficiency of the ball mill.
4、 Compared with roller press machine
1. Material fineness
One is FPP grinding (fixed bed), whose finished product has a specific surface area of generally 180-240m2/kg
The second is the roller press (fluidized bed), whose finished product has a specific surface area of generally 110-230m2/kg
2. Energy consumption
Figure 1 shows that the domestic roller press is constrained by hardware such as bearings and hydraulic components, and operates at a reduced pressure of 8MPa during operation, resulting in pre ground products with a specific surface area of 100-140m2/kg. In order to achieve a pre grinding specific surface area of 180m2/kg under domestic supporting conditions, the designers further increased the roller press to significantly increase its installed power to 15kWh/t cement (FPP grinding installed power is 7kwh/t), resulting in a significant increase in power consumption.
Distribution diagram of pressure zone of domestic and Humboldt roller press material bed
Technical Specifications
FPP mill+coarse powder classifier+ball mill for grinding ordinary cement technical parameters table
| Pre grinding specifications and models | Installed capacity (kw) | Grinding particle size (mm) | Grinding water content (%) | Throughput (t/h) | Grinding fineness(mm) | Output(t/h) | Specification and model of final grinding (ball mill) | Installed capacity(kw) | Specific surface area(m²/kg) | output(t/h) | Electricity consumption for grinding(kwh/t) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| FPP1300 | 200 | ≤25 | ≤1.5 | ≤50 | ≤3 | 35 | ①2.6×13m | 1000 | ≥320 | 35 | 25.71 |
| FPP1500 | 300 | ≤25 | ≤1.5 | ≤75 | ≤1 | 45 | ①2.6×13m | 1000 | ≥320 | 45 | 21.7 |
| FPP1700 | 400 | ≤30 | ≤1.5 | ≤100 | ≤3 | 70 | φ2.6×13m | 1600 | ≥320 | 70 | 21.4 |
| FPP12100 | 630 | ≤30 | ≤1.5 | ≤160 | ≤1 | 95 | Φ2.6×13m | 1600 | ≥320 | 85 | 19.68 |
| FPP2200 | 710 | ≤35 | ≤1.5 | ≤200 | ≤3 | 120 | ①2.6×13m | 2500 | ≥320 | 120 | 20.08 |
| FPP2400 | 900 | ≤35 | ≤1.5 | ≤230 | ≤1 | 140 | ①2.6×13m | 2500 | ≥320 | 140 | 18.21 |
| FPP2600 | 1000 | ≤40 | ≤1.5 | ≤250 | ≤3 | 170 | Φ2.6×13m | 3350 | ≥320 | 170 | 19.19 |
| FPP2800 | 1250 | ≤40 | ≤1.5 | ≤320 | ≤1 | 190 | Φ2.6×13m | 3350 | ≥320 | 190 | 18.16 |
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