Equipment Comparison Of Slag Powder Production Line|Slag Vertical Roller Mill For Sale

At present, the slag powder production line equipment mainly includes: slag ball mill system, slag vertical roller mill system, and slag roller press system, etc. HCMilling(Guilin Hongcheng), as a manufacturer of slag micropowder production line equipment, will introduce various slag micropowder production line equipment to you, and compare their advantages and disadvantages for your reference to choose a more suitable slag micropowder production line equipment.

slag vertical roller mill-HCM

1. Ball mill:

The traditional ball mill is used to prepare slag fine powder, and its technological process can be divided into open flow and circular flow system. The open-flow system generally adopts a high-capacity mill, and the material is fed into the ball mill by metering, and the material coming out of the ball mill is the finished product. The slag must be dried before entering the mill, and the moisture content of the material into the mill should be controlled to be less than or equal to 2%. The advantages of the open-flow system are low investment, reliable production, simple operation, and high equipment operation rate; the disadvantages are that the system has high grinding power consumption, low efficiency, difficulty in adjusting product fineness, easy to produce over-grinding phenomenon, and high grinding body wear. . In addition, as the product fineness requirement is finer and the grinding time is longer, the specific surface area of the material is increased, and its specific surface energy is also increased, so the tendency of fine particles to aggregate and agglomerate with each other is gradually increased, which affects the grinding efficiency. , and will also cause an increase in grinding power consumption. In order to prevent the slag powder from adhering to the surface of the grinding body and the lining plate and reduce the grinding efficiency, the powder is generally dispersed by adding a grinding aid to prevent the aggregation between particles and eliminate the unfavorable factors of electrostatic adsorption. The finer the grinding fineness, the more obvious the effect of using grinding aids. The circular flow system generally adopts the ordinary ball mill + high-efficiency powder separator system. Compared with open flow, the fineness of the product is easy to adjust, which can reduce the phenomenon of over-grinding, the grinding efficiency is relatively high, and the single-machine capacity is increased, but the system is complex. The ball mill is used to grind the slag micropowder. Since the particle size of the material to be milled is reduced, the ball mill needs to be adjusted: the gradation of the grinding body in the mill needs to be adjusted. The larger ball is reduced and the smaller ball is replaced. The largest ball is generally ≤60mm, because the slag is difficult to grind. , appropriately increase the grinding body loading; move the position of the partition plate forward to increase the length of the fine grinding chamber. The general power consumption of grinding slag powder by steel ball mill is ≥70kWh/t.

2. Vertical roller mill:

Vertical mill is also known as slag vertical roller mill. Its grinding mechanism is material bed grinding, which is continuous extrusion grinding between one-time material layers in a non-closed space. The extrusion angle of the material is greater than that of the roller press, which is about 12 degrees. The moving speed of the grinding roller is generally 2m/s ~ 6m/s, which is faster than the linear speed of the roller surface of the roller press. During the grinding process, a stable material bed can be formed by adjusting the amount of water spray in the mill, so that the grinding vibration can be controlled within the allowable value range. The vertical mill has a good ventilation and drying function. It integrates material drying, grinding, powder selection and collection. It is not necessary to set up a separate drying system. As fine as the specific surface area is more than 450m2/kg, and it can be easily adjusted. The slag vertical roller mill itself occupies a small area, the production process is simple, and the construction cost is low. When preparing slag micropowder with the same specific surface area (≥430m/kg), the power consumption per unit grinding of the vertical mill and the roller press is similar, but the power consumption of the vertical mill is similar to that of the ball mill. The (tube) mill system saves more than 40% of electricity. Among the slag micropowder grinding systems that have been built in China, the vertical grinding system accounts for the absolute majority.

3. Roller Press：

The roller press system can be divided into final grinding system and roller press + ball mill combined grinding system. Final grinding system: The material is fed into the roller press for extrusion and grinding, and the material from the roller press is broken up by the disperser, and then sent to the powder separator for sorting, and the qualified products are sent to the slag Stored in the warehouse, the coarse powder is returned to the roller press for re-grinding. The system makes full use of the high-efficiency grinding mechanism of the roller press, the grinding efficiency is high, and the energy consumption is lower than that of the ball mill grinding system. Compared with the slag powder of z420m2/kg, the unit power consumption is about 50kWh/t. However, because the content of fine powder in the material extruded and ground by the roller press is relatively small, the cyclic load is large, and the amount of fine powder in the finished product is not enough. Although the quality of the finished product can meet the requirements, the quality of the product with the same specific surface area is better than that of the ball mill and vertical The quality of the milled product is poor. Combined grinding system: the material is fed into the roller press for extrusion and grinding, the material from the roller press is broken up and classified by the disperser, the coarse particles are returned to the roller press for further extrusion, and the fine powder is sent to the ball mill Grinding inside. The system utilizes the high-efficiency grinding mechanism of the roller press, with high grinding efficiency and lower energy consumption than the ball mill grinding system. The unit power consumption of grinding 420m2/kg specific surface area slag powder is about 60kWh/t. Although this system overcomes the disadvantage that the product quality of the final grinding system of the roller press is not as good as that of the ball mill and the vertical grinding system, the technical process is complex, the requirements for operators are higher, the floor space is larger, and the investment is higher than that of the ball mill system. And the final grinding system of the roller press is large. At present, there are few domestic enterprises that use the roller press system to grind slag powder.

4. Equipment comparison of slag powder production line：

After more than 100 years of development, the ball (tube) mill has reliable technical performance and stable operation, but because it is difficult to form a material bed during the grinding process, the utilization rate of electric energy is extremely low, and the grinding efficiency is also low. Using traditional ball (tube) mill to produce slag micropowder still belongs to the primary stage of slag micropowder preparation. Although the one-time investment is less, the drying process needs to be set up separately. The whole grinding process is more complicated and covers a large area. When preparing slag powder with the same specific surface area, the unit grinding power consumption is higher than that of vertical roller mill and roller presses. , roller mill process 25kWh/t ~ 35kWh/t. If the average power consumption is 30kWh/t higher, the ball (tube) mill grinding slag powder production line with an annual output of 1 million tons consumes 30 million kWh more power than the vertical roller mill, roller press, and simple roller mill production line. The average electricity price is 0.50 yuan/kWh, and the annual extra electricity cost is 15 million yuan, that is, the hidden loss of profit is 15 million yuan per year, which is a lot of money. To be precise, the use of ball (tube) mill to produce slag micropowder, compared with the efficient and energy-saving material bed grinding process, is a long-term increase in power consumption costs and a hidden loss of long-term profits, and it is difficult to achieve energy saving, emission reduction, consumption reduction and increase. effective target. Three types of high-efficiency material bed grinding equipment, vertical mill, roller press and simple roller mill, are used to prepare high-activity slag micropowder. Although the one-time investment is large and the investment recovery period is long, the power consumption per unit of grinding is low. The (tube) mill system saves electricity by more than 40%, with good long-term benefits and stable product quality. There are three kinds of material bed grinding systems, and the process flow of the roller press is more complicated than that of the vertical roller mill and the simple roller mill. The vertical grinding mill and grinding system integrates drying, grinding, powder selection, and collection. The process is simple, forming a serialization and humanization. Large-scale domestic iron and steel enterprises and cement grinding stations have widely adopted vertical grinding technology.

Granulated blast furnace slag is the product of the process of smelting pig iron, which contains a certain amount of elemental iron and iron oxide. In particular, the elemental iron particles have ferromagnetism and plasticity, which are difficult to grind and accumulate in the grinding mill, which aggravates equipment wear and must be removed. In order to eliminate the adverse effects of elemental iron particles and iron oxide on the grinding process, it is necessary to set up multiple channels of strong magnetic iron removal before grinding. The collected elemental iron particles and iron oxides can be sold back to iron and steel enterprises at a certain price, which can offset part of the electricity bill. Therefore, the removal of iron is extremely important to improve the grinding efficiency and slag grinding degree, and effectively reduce the wear of slag grinding mill equipment. Compared with slag vertical roller mill, roller presses and cylinder roller mill, the traditional ball (tube) mill for preparing slag micropowder cannot form a material bed in the grinding mill, and the grinding efficiency is low, the unit power consumption is high, and the production cost is high. Vertical roller mill, roller presses and simple roller mill are high-efficiency power-saving equipment for material bed grinding, which realizes the final grinding of non-spheroidized slag and is used to prepare slag powder with the same specific surface area. Compared with traditional ball (tube) grinding In terms of machine technology, the power saving rate is more than 40%. The use of high-efficiency and low-energy consumption grinding equipment to prepare slag powder is more conducive to energy conservation and emission reduction, and the development of circular economy.

It can be seen from the above introduction that the slag vertical roller mill system is the preferred process for large-scale slag micropowder preparation enterprises due to its low power consumption and metal consumption per unit of grinding, simple process flow and small footprint. HCMilling(Guilin Hongcheng) is a manufacturer of HLM slag vertical roller mill. The slag vertical roller mill we produce have been widely used in the market and have a good reputation. If you have purchase requirements for slag powder production line equipment, please contact mkt@hcmilling.com or call at +86-773-3568321, HCM will tailor for you the most suitable grinding mill program based on your needs, more details please check www.hcmilling.com.