First, the structure of the ring roller mill
Ring roller mill is to produce non-metallic mineral ultrafine powder dry over device, mainly by the base, the base host, central axis, turntable, roller, grinding ring, dial the tray, the lubricating device, a belt drive, the damper , the main motor and other components.
Second, the working principle
The ring roller mill uses the principle of impact, extrusion and grinding to pulverize the material. There is a large active gap between the grinding ring and the pin shaft mounted on the grinding ring bracket. When the material passes through the gap between the grinding ring and the grinding ring, it is crushed by the impact, extrusion, grinding of the grinding ring. The pulverized material falls under the action of gravity, falls to the hopper tray and is smashed into the airflow into the grading chamber for grading. The qualified fine powder is collected by the grading wheel into the rear collecting system, and the coarse material is circumvented into the shunt ring and re-entered. The pulverization chamber is pulverized. When the double-layer grinding ring pulverizer is working, the material is pulverized again when it passes through the gap between the second layer grinding ring and the grinding ring.
Third, the application in the non-metallic mining industry
Ring roller mill is mainly used for superfine pulverization of minerals such as calcite , dolomite, limestone , marble and wollastonite .
Taking calcite as an example, the crushing process is mainly divided into four stages:
1. Broken raw materials
The calcite bulk material is crushed by the crusher to the incoming fineness (15mm-50mm) which can enter the mill.
2, milling
The crushed calcite pieces are sent to the storage hopper through the hoist, and then uniformly and quantitatively fed into the mill grinding chamber through the feeder for grinding.
3. Grading
The ground material is classified by a grading system, and the unqualified powder is graded by a classifier and returned to the main machine for re-grinding.
4. Collection of finished products
The powder conforming to the fineness is separated and collected by the airflow into the dust collector through the pipeline, and the collected finished powder is sent to the finished silo through the discharge device through the discharge port, and then uniformly packaged by the powder tanker or the automatic baler.
Fourth, the advantages of ring roller grinding
1. Investment province and high efficiency
Investment savings are nearly half compared to large-scale plants. The construction of a micro-powder production line with an annual output of 10,000 tons requires an investment of 1.39 million yuan. The product with the same fineness is produced by ring roll grinding, with an annual output of 10,000 tons, and the investment is only 500,000 yuan, saving 60% of investment.
2, high classification accuracy
With the internal grading device, the grading wheel has a unique structure, good grading effect and no large particle pollution.
3, low energy consumption
The processed product has a fineness of D97<10μm and a power consumption of about 95kW·h/t. Compared with other equipment, it has obvious power saving and is a new type of energy-saving product.
4, work is stable and reliable
The drive shaft of the ring roller mill is driven by a reducer, which has low energy consumption, high efficiency and efficiency >96%.
5, higher specific surface area
The specific surface area of ​​the powder is the surface area occupied by the unit mass and is an important indicator for the activity of the ultrafine calcium carbonate powder. The ring roll mill can produce ultrafine powder with a specific surface area of ​​2.24m3/g (D97=10μm) to 3.04m3/g (D97=4μm), which is much higher than other domestic equipment.
5. Several problems should be paid attention to when processing the fine powder by ring roll grinding:
1, to maintain the balance of material in and out
The contact between the grinding ring and the grinding ring is non-rigid contact, wherein the gap pad has a layer of pulverized material, and the gap between the grinding ring and the pin shaft is large, and the current reflected to the spindle motor is not tripped due to excessive feeding, during commissioning, Under the premise of ensuring the fineness of the product, it should be gradually increased; if the feeding is too fast, the material will be unbalanced in and out, and the discharge speed will decrease, and the coarse powder will be taken out, and the product size will be uneven.
2, properly extend the downtime to ensure that the memory material is completely discharged
After stopping the feeding, there are still materials in the pulverizing chamber, and all the materials must be pulverized and discharged before stopping, so that the next startup is smooth. After stopping the feeding generally, it should continue to be turned on for about 5 minutes. When a sudden power failure occurs, the motor coupling is hand-held before the power is turned on, and the rotation is flexible and the power is transmitted. If the card is severely stuck, the material should be turned on.
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