Vertical roller mill

High-quality Quicklime Vertical Roller Mill manufacturer

Tongli quicklime vertical roller mill (commonly known as lime mill) is a kind of equipment specially used for fine grinding of quicklime (calcium oxide, CaO). Its main function is to crush and grind large pieces of quicklime to produce fine powdered calcium oxide for a wide range of industrial applications. The working principle of the quicklime mill is based on the rolling action of the rollers on the grinding disc, while the qualified fine powder is brought out by the air flow, and the material that does not meet the fineness requirements will continue to be ground. Due to the use of advanced vertical mill technology, the quicklime mill is more energy-efficient than the traditional ball mill and has an efficiency increase of 30%-50%. This is because the material spends less time on the grinding disc, but the grinding force is stronger.

quick lime grinding vertical roller mill profile picture1 by tongli heavy machinery

TONGLIVRM

A MACHINE YOU CAN DEPEND ON!

The roller bearings of the quicklime vertical mill produced by Tongli Company adopt the thin oil circulation lubrication method, which can ensure that the bearings work at a lower temperature, while controlling the quality and purity of the lubricating oil, which is conducive to extending the service life of the bearings.

Good stability

The design of the vertical mill ensures the stability of operation, reduces vibration and noise, and improves the service life of the equipment and the continuity of production.

High product quality

The quicklime powder produced by Tongli quicklime vertical mill has uniform fineness and good particle shape, which can improve the quality and performance of downstream products.

Strong grinding capacity

The quicklime vertical mill can handle large pieces of materials, and the grinding fineness is adjustable, which can produce quicklime powder of different finenesses to meet the needs of different applications.

Vertical Mill SpecificationOutput (t/h)Fineness (Residue on 80μm Sieve)Moisture ContentPower (kw)
ZJTL282082~115R ≤ 12%≤ 0.5%1000
ZJTL3030100~1201120
ZJTL3230120~1301250
ZJTL3440140~1601600
ZJTL3640160~2101800
ZJTL3840200~2302000
ZJTL4040220~2502240
ZJTL4240250~2902500
ZJTL4540290~3303150

FAQ

1.What is the working principle of the quicklime vertical mill?

Quicklime blocks or particles are evenly fed into the mill’s feeding device via a feeding system (such as a feeder or screw conveyor). Generally, the material is sent to the center of the grinding table. The material is spread out on the grinding table. The grinding table typically has a central feed port and several radially distributed feeding slots. The material is subjected to centrifugal force on the grinding table, spreading outward into the grinding zone of the table.

Above the grinding table, there are one or more grinding rollers that apply pressure to the material through mechanical devices (such as hydraulic systems). The pressure from the grinding rollers crushes the material into powder. The relative motion between the grinding table and the rollers continuously crushes the material, while the centrifugal force generated by the rotating grinding table throws the ground material onto the rollers.

The combination of pressure applied by the rollers and their rotational movement continuously crushes the material. There is usually a classification device (such as a classifier wheel) around the grinding table that classifies the ground material. Coarser particles are rejected by the classifier wheel and returned to the grinding table for regrinding, while finer particles are carried away by airflow from the classifier. The airflow generated by the fan transports the fine powder through the classifier to a cyclone separator or bag filter for separation. The cyclone separator separates the fine powder from the airflow and then sends the powder to the finished product warehouse or conveyor system.

2. How to increase the output of the quicklime vertical mill?

Increasing the pressure of the grinding rollers can enhance the grinding efficiency of the material, but care should be taken to avoid excessive wear. Appropriate increases in the rotational speed of the grinding table can extend the grinding time, but it is important not to rotate too quickly to prevent excessive wear on the equipment or vibration.

Optimizing the airflow and wind speed settings of the fan can maintain an appropriate airflow rate and dust classification effect, thereby improving the efficiency of fine powder removal and reducing the particle size range of the finished product. Ensuring that the material enters the mill uniformly can avoid local overload or underload situations. Pre-crushing the quicklime blocks appropriately can reduce the particle size of the material entering the vertical mill, improving grinding efficiency.

Adjusting the classifier wheel's rotational speed according to actual conditions can optimize dust classification efficiency. Regular maintenance of the vertical mill should be performed, checking and replacing grinding rollers, grinding tables, and other wear parts to prevent equipment failures that may affect output.

3. How to do maintenance and upkeep of the quicklime vertical mill?

Regularly check the wear condition of the grinding rollers and grinding table to ensure there is no severe wear or cracks on their surfaces. Clean the equipment periodically to remove adhering materials that may affect grinding performance. Inspect the condition of the classifier wheel to ensure it rotates freely without obstruction. Regularly clean the classification device to maintain its normal operation. Periodically check the quality and level of lubricating oil, replacing it according to the manufacturer's recommendations.

The lubrication system should be well-maintained to ensure effective lubrication of the grinding rollers, grinding table, and other moving parts. Check the lubrication status at all points to ensure a normal supply of grease or oil. Adjust the grinding roller pressure regularly according to actual production conditions and equipment wear to maintain grinding effectiveness and stable equipment operation. Regularly inspect the operation status of the motor and frequency converter to ensure the electrical system works properly.

Check for loose or damaged cables and terminals. Regularly clean and maintain dust removal equipment, such as bag filters or cyclone separators, to keep good dust removal efficiency and equipment operating conditions. Maintain detailed maintenance records, including the time and content of each inspection, repair, and part replacement, to facilitate tracking the equipment's condition and maintenance history.

4.What are the applicable ranges for the quicklime vertical mill?

The primary application of the quicklime vertical mill is to grind quicklime (also known as limestone). It is capable of crushing large particles of quicklime to the desired fineness to meet various industrial needs, producing quicklime powder of different fineness to adapt to various industrial applications. The quicklime vertical mill can also be used for raw material grinding in the cement industry, such as limestone, clay, and slag, helping improve the efficiency of raw material grinding in cement production.

It can be used for grinding certain ores, such as bauxite and iron ore, facilitating further smelting or processing. It can grind slag from the smelting process, such as blast furnace slag, providing suitable particle sizes for reuse. The mill can be used for grinding some industrial waste and by-products, such as fly ash, for easier handling and reuse. It is applicable for grinding certain building material raw materials, such as gypsum and some construction minerals, to produce different construction material products.

In fertilizer production, it is used to grind some fertilizer raw materials, such as phosphate rock and potash, to facilitate the production of granular fertilizers. It is utilized for grinding certain chemical raw materials and intermediates, meeting the fineness requirements of chemical production. Although less common, it can also be used to grind food or pharmaceutical raw materials, provided they meet hygiene standards and are specially designed.

5. Common issues with the quicklime vertical mill?

Insufficient or uneven feeding; severe wear of the grinding rollers or grinding table; insufficient airflow or inappropriate wind speed from the fan; and blockage or reduced efficiency of the classification device may lead to insufficient output from the vertical mill. Solutions: Check and adjust the feeding system to ensure uniform feeding. Regularly inspect and replace grinding rollers and grinding tables.

Adjust the fan's airflow and wind speed to maintain appropriate airflow. Clean or maintain the classification device to ensure it operates normally. Uneven product fineness may be caused by improper adjustment of the classifier wheel; uneven wear of the grinding rollers and grinding table; or overly large particle size of the incoming material.

Solutions: Adjust the rotational speed of the classifier wheel to optimize the classification effect. Check the wear condition of the grinding rollers and grinding table and perform necessary replacements or repairs. Pre-treat the feed to reduce the particle size of the material.

6. How does the climatic environment affect the quicklime vertical mill?

In high-temperature environments, the equipment's lubrication system, hydraulic system, and electrical components are prone to overheating, which may lead to the deterioration of lubricating oil, unstable hydraulic system pressure, and electrical system failures. Countermeasures: Strengthen the equipment's cooling system to ensure sufficient supply of cooling water or coolant. Use high-temperature-resistant lubricating oil and hydraulic oil. Install heat dissipation devices for electrical components or improve workshop ventilation.

High humidity can accelerate the corrosion of the equipment's metal parts, affect the stability of the electrical system, and may cause materials to absorb moisture and clump together, impacting grinding performance. Countermeasures: Regularly perform rust prevention treatments and surface protection for the equipment. Use moisture-proof sealing and protective measures to prevent moisture from affecting electrical components. Control the moisture content of the feed and pre-dry materials if necessary. Ensure the dust removal and ventilation systems are functioning properly to reduce ambient humidity.

Variations in atmospheric pressure can affect the performance of the fan and the stability of airflow within the mill, consequently impacting grinding efficiency and product quality. Countermeasures: Monitor the internal air pressure and airflow, adjusting fan parameters in a timely manner to maintain stable airflow. Adjust the operating parameters of the classification device according to changes in atmospheric pressure to ensure the stability of the product's fineness.

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APPLICATION

Calcitic Lime

Calcitic Lime

Calcitic limestone is rich in calcium carbonate and serves as the primary raw material for quicklime production. Vertical mills are ideal for grinding this material, providing efficient fine grinding that aids in producing high-purity quicklime with minimal energy consumption.

Dolomitic Limestone

Dolomitic Limestone

Dolomitic limestone, containing both calcium and magnesium carbonate, is processed into dolomitic quicklime. Vertical mills are effective in grinding this harder material, producing a fine, consistent product suitable for steelmaking and other industrial applications.

Marble

Marble

Marble, a high-calcium carbonate rock, can be finely ground into quicklime. Vertical mills can handle the processing of this material efficiently, producing a fine lime product for various uses, including water treatment and soil stabilization.

Limestone Sludge

Limestone Sludge

Limestone sludge, often produced in mining operations, can be processed into quicklime using vertical mills. These mills can grind the sludge effectively, producing quicklime with high reactivity and better utilization rates.

High-Calcium Lime

High-Calcium Lime

High-calcium lime, produced from limestone with high calcium content, can be efficiently processed by vertical mills. The mills ensure fine grinding, producing high-reactivity lime for use in construction, environmental, and chemical industries.

Magnesium Lime

Magnesium Lime

Magnesium lime, derived from dolomitic limestone, is processed for use in a variety of applications, including iron and steel production. Vertical mills handle this material's grinding efficiently, ensuring consistent quality and high reactivity in the final product.

Calcined Clay

Calcined Clay

Calcined clay, used in cement and lime production, benefits from the fine grinding capabilities of vertical mills. These mills efficiently grind calcined clay into a fine powder, optimizing quicklime production for a wide range of industrial uses.

Slaked Lime

Slaked Lime

Slaked lime, a product of quicklime and water, can be finely ground for various applications, including water treatment and chemical manufacturing. Vertical mills process slaked lime with high efficiency, ensuring a consistent, high-quality product for industrial processes.

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