Process Flow

Tag 1
Raw Material Metering and Conveying System

The raw material conveying system is designed as a ground warehouse feeding system, with a quantitative feeding belt at the lower end of the ground warehouse for quantitative feeding. The material is lifted by a bucket and fed into a locked air feeder, where it is then fed into the mill.
Tag 2
Grinding System

The main machine of the grinding system is a vertical mill specifically designed for cement clinker. There are independent lubrication stations and hydraulic stations. The ground material is selected by a powder selector and sent to an offline pulse bag filter for collection. A membrane waterproof and oil proof filter bag is used with high filtration accuracy, and the concentration of discharged dust depends on local environmental requirements. The entire grinding system operates under negative pressure. The fan motor adopts high-voltage variable frequency control, which can be finely adjusted, improve system output, and reduce fan energy consumption. Realize efficient and versatile use of one machine.
Tag 3
Return System

Vertical mills have the advantage of external slag discharge. When iron materials with high density and material fluctuation are ground excessively, they can be discharged from the outside of the mill through the external slag discharge system. The discharged materials fall into the belt conveyor, and the materials on the belt conveyor pass through the iron remover to remove the iron materials from the slag discharge, which are then manually processed. After removing iron, the material is sent into the external circulation bucket elevator, into the chute, and after being locked in the air, it is sent back into the mill for grinding.
Tag 4
Hot Air System

The vertical mill grinding and drying adopts a closed-loop hot air system process, which reduces the external exhaust air volume and heat source energy consumption, and enables a part of the heat source to be recycled. The main equipment of the hot air system uses high-temperature flue gas from the kiln tail waste heat of 800-900 ℃, mixed with cold air and circulating air, to generate high-temperature gas of 250-350 ℃, which is sent into the mill for drying the materials. The entire air path is automatically controlled under the control of a globe valve and a damper valve.
Tag 5
Finished Product Storage and Transportation System

The finished products collected by the pulse pulse dust collector are collected by a screw conveyor and transported to the corresponding finished product silo by a bucket elevator.

Working Principle

The vertical mill is based on the main principle of material layer grinding. The grinding disc is driven by a motor to rotate at a constant speed, and the material forms a stable material layer on the grinding disc. The grinding roller applies high pressure to the material layer under the action of the hydraulic system, and achieves material crushing through squeezing and shearing. At the same time, hot air enters from the circular air duct at the bottom of the grinding disc, which blows up the fine particles after grinding and completes material drying (can handle clinker with moisture content ≤ 8%). The built-in powder selector adopts the principle of eddy current classification, and controls the fineness of the finished product by adjusting the blade angle (usually 45 μ m sieve residue ≤ 10%), achieving an integrated operation of "grinding-classification-drying" without the need for additional drying equipment.

Industry Applications

High efficiency and energy saving:

The grinding efficiency of the material layer is much higher than that of the impact grinding of the ball mill, and the power consumption per unit product is only 60% -70% of that of the ball mill. The annual energy saving of a single production line can reach millions of kWh.

Compact process:

integrating grinding, grading, and drying functions, the equipment occupies only 50% -60% of the ball mill system, reducing civil engineering investment by more than 30%.

Excellent quality of finished products:

Irregular particles with high sphericity in particle shape, reasonable gradation, easy to control of specific surface area (300-450m ²/kg), conducive to cement hydration reaction and improving concrete strength.

Stable operation:

There is no direct metal contact between the grinding roller and the grinding disc, resulting in minimal wear and low failure rate. The continuous operation time is long, and the maintenance cost is only 50% -60% of that of the ball mill.

Environmental friendliness:

The closed loop system has no dust overflow, and the noise level is below 85dB, which meets environmental standards.

Vertical Grinding Clinker Grinding Production Line

Process Flow

Working Principle

Industry Applications

High efficiency and energy saving:

Compact process:

Excellent quality of finished products:

Stable operation:

Environmental friendliness:

Gypsum grinding machines

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