High Output VRM Cement Mill , VRM Cement Plant Surface Area≥420m²/Kg Slag

Surface Area≥420m²/Kg Slag Vertical Roller Grinding Mill With Higher Output

Granulated blast furnace slag powder is increasingly used in cement and concrete. Slag Vertical Roller Mill is used to grind the slag into powder in order to fully stimulate the activity of slag, slag powder can improve the durability and workability of concrete. It is a fine mineral admixture with excellent performance. Slag powder have the following features: economic benefits, significant energy saving and environmental protection benefits, which is consistent with economic sustainable scientific development strategy. Due to the high density of slag and low grinding ability, grinding slag powder alone into slag powder with a specific surface area ≥420m2 / kg requires extremely high technical performance of the slag vertical roller mill.
After the raw materials of each component are qualified by the batching system, the mixed raw materials are conveyed in by the vertical roller mill belt conveyor, removed by the electromagnetic iron remover, and then dropped into the center of the rotating grinding table through the rotary air lock feeder. The raw materials begin to move to the edge of the grinding table into the grinding roller table under the action of the grinding roller, the grinding component-the grinding roller exerted pressure on the raw material in the grinding roller table under the action of the hydraulic system, so that the raw material was crushed, sheared, squeezed and ground.

After grinding, the raw materials continue to move toward the edge of the grinding table into the nozzle ring around the grinding table. Due to the high-speed upward airflow from the hot blast furnace, a part of the fine dust is brought to the classifier of the vertical roller mill. After being classified, the qualified raw materials are discharged from the slag vertical roller mill outlet with the wind. After being processed by the high-concentration bag dust collector, the slag fine powder is collected, discharged by the screw conveyor and the ash discharge valve, and sent into the slag fine powder. After further removing the iron, it enters the belt conveyor and returns to the vertical mill to continue to be ground until the ratio Until the surface volume reaches the requirement.

In order to control the slag vertical roller mill grinding system in real time, the vertical roller grinding mill is also equipped with a computer control system to ensure the safe and stable operation of the vertical roller mill grinding system. The feeding amount can be adjusted according to the differential pressure of the vertical mill, the opening of the valve can be adjusted according to the negative pressure at the entrance of the vertical mill, the water spray amount can be controlled according to the level of the temperature of the mill, etc. , Pressure, pressure difference, vibration real-time control can be recorded as well as the output of the vertical mill system and system operating parameters.

Vertical roller mill feeding requires uniform particle size and stable feeding amount. Fluctuations in the feeding amount will break the circulation balance of the materials in the vertical roller mill, which will cause fluctuations in the material layer, making the grinding table material grinding unevenly stressed, and also brings rapid vibration. The normal thickness of the material on the grinding table is 30 ~ 60mm. The slag particles are generally finer and have more water. In the feeding process, the dry slag recycled from the outside (dried by the hot air in the mill) and the wet slag are mixed together in the vertical roller grinding mill, which is easy to bond and agglomerate. The feeding of the HRM type slag vertical mill adopts a dry and wet separation method, which is provided with two feed ports and two rotary air lock valves. The wet material is fed into the vertical mill through the wet material inlet through one air lock valve. The dry material from the inner and outer circulation is fed into the vertical mill by another air lock valve through the dry material inlet. Generally, the wet material inlet is larger than the dry material inlet. Through this feeding method, it solves blocking and stoppage of the rotary valve.

The vertical roller mill special features: (1) Special hyperbolic arc surface design, larger contact area, high concentration of grinding pressure in grinding area. (2) Change from ordinary double-roller design to three-roller design to improve grinding efficiency. (3) Each grinding roller uses a double-cylinder inclined-pull design, and the high grinding pressure makes the material easier to crush. Because the centrifugal force and the inclined grinder guide the material to the retaining ring, the ultra-fine vertical roller mill has the advantages of uniform material layers. Other flat grinding rollers will cause material accumulation in front of the retaining ring and reduce the grinding efficiency.

The Advantages of Slag Vertical Roller Grinding Mill:

1. High efficiency

(1) Low energy consumption, high efficiency, 40%-50% lower energy consumption than ball mill;

(2) High single machine output, can use off-peak electricity;

(3) Vertical mill technology is initiated by the country, it can improve the competitive strength of the enterprises in local area or even in the country;

2. Easy maintenance, low operation cost

(1) The rollers can be pull out from the mill by the hydraulic device, which is convenient for plate-replacement and bigger maintenance space;

(2) Left and right side of the roller shell can both be used for prolonging the working life;

(3) The mill can run without raw material on the grinding table, which erases the difficulty in starting;

(4) The roller and grinding table are made from special material for longer working life;

(5) High degree of automation: Applied Germany Siemens PLC series with automatic control system and can realized easy long-distance control and unmanned operation.

3. Low investment cost

The equipment features in a combination of crushing, drying, grinding, and conveying, simple process flow, reasonable and compact layout, space-saving (50% less than ball mill), lower foundation cost and workshop cost in the field;

4. Stable powder quality

(1) Material stay a short time in the mill, easy to control fineness and chemical component;

(2) Regular powder shape, narrow fineness range, good fluidity, extensive application;

5. Reliability

(1) Rollers with height-controlled device, which could avoid strong vibration caused by the lack of material on the table;

(2) Newly-designed roller sealing component ensures the reliable sealing without sealing the blower, which can lower the oxygen content in the mill to prevent the possibility of explosion;

6. Environmentally friendly

(1) Lower vibration and noise;

(2) The whole facility is all sealed and operates under negative pressure, no powder overflow, no-dust workshop can be realized.

(3)Vertical mill is the better equipment to lower power consumption in the mill industry, which is also what the country advocate and a must to increase the enterprise competitiveness in China powder industry.

7. High Automatic Level

(1) PLC automatic control system, remote control, easy operation and maintenance, lower labor cost.

8. Strong Drying Ability

(1) Vertical mill features in high trying ability with hot air direct contact with the material in the mill, maximal feeding moisture of 15% is workable. A separate drying machine and energy for the mill system can be both saved. The vertical mill can satisfy the materials in different humidity by adjusting the hot air temperature.

Technical Data of Slag Vertical Roller Grinding Mill:

Guangxi Henkry Machinery Co., Ltd is a professional company which focus on the following machinery: vertical mill, micro powder mill, pendulum roller grinding mill, packing machine, coating machine, air compressor, calcium hydroxide production line, elevator and etc.

As we have been in China Powder Machinery Industry for 20 years, we have accumulated enough knowledge and experience for powder-making technology and related equipments in China.

We aim to provide highest quality powder equipment to customer with reasonable price, which can not only meet their requirements, but also owns stable performance for guaranteeing continuous production.

What we expect is a friendly and long-term cooperation business relationship with our customer. A win-win situation and mutual trust is also what we always pursue.