Slag vertical mill

The blast furnace slag (hereinafter referred to as graining blast furnace slag) is smelting pig iron from industrial waste residue. Due to its high chemical and physical activity and potential hydraulic, in industry of our country cement mixed material used widely as. Slag grinding system using the metallurgical industry of industrial waste residue, waste not only can improve the slag, added value, for the iron and steel enterprises to create considerable economic benefits, but also saves a large amount of non-renewable resources, with steel and cement industry structure adjustment policy.

One, HRM vertical mill is suitable for metallurgy, building materials, chemical industry, electric power industry grinding coal, coke, cement raw materials cement, gypsum, barite, phosphorus ore, decomposition, kaolin and other materials with medium hardness ore. HRM series vertical mill grinding, drying, grinding, powder selection as one, simple process flow. Vertical mill and tube mill compared with grinding, high efficiency, low power consumption 20-30%, drying capacity, moisture of material up to 15%, the grain size is large, the product fineness and easy adjustment, stable chemical property, no impact and no direct contact between the metal, low noise, little abrasion, mill separator, not a separate classifier, small occupied space, construction area of the corresponding small, grinding roller can turn out machine repair, etc..

Two, the working principle of vertical mill

1, the main structure and function

•   The main structure is composed of vertical mill separator, roller grinding device, the grinding disc device, pressure device, reducer, motor, shell and other components.

•   The separator is decided mill products thickness is important part, which is composed of adjustable speed drive device, guide vane, rotor, casing, a coarse powder blanking cone, and an air outlet component, is a kind of high efficiency, energy saving, efficient powder selecting device.

•   Roll grinding is grinding materials main parts. It was in a mill arms, under the action of external force, pressed in the grinding material, in the disc drive, roller rotates, so that material is compacted and crushing.

•   Millstone is fixed on the output shaft of reducer, disc upper bed, the bed material has an annular groove, the material is in the annular groove is grinding roller milling.

•   Pressure device is provided with roller mill pressure components, comprising a high-pressure oil station, hydraulic cylinder rod, accumulator, etc., to roll exert enough pressure to make the material crushing.

•   Reducer is a transmission power of the main components, grinding speed is the speed reducer output shaft speed.

2, work principle

Electric motor through a speed reducer drives the disc rotation, while hot air from the air inlet to the mill, material from the feeding port falls on the disc center, due to the effect of centrifugal force, material from the disc to the disc edge is moved through the central, annular groove of the disc, grinding roller and grinding by rolling, the crushed material to disc edge motion, until the wind was at ring of airflow away, while the large particles and fall to the disc continues to shatter. The material in the upper part of the air flow through the separator, in guide vane under, coarse material from cone to the disc, the fine powder with air when grinding, be system of dust collector to collect, the collected powder material is the vertical mill products. The material in the shell and gas contact in the process of being dried, achieve product desired humidity. By adjusting the angle of the vane separator oriented ( small mill is not adjustable ) and separator rotor speed, and can reach the products required thickness.

Three, the advantages of vertical mill

Compared with ball mill, vertical mill has the following advantages:

1, high grinding efficiency, the grinding roller vertical mill and the bed material compacted ground material, low energy consumption, milling system power consumption than that of milling system reduces 20 ~ 30%, while raw material moisture increased, energy saving effect is remarkable.

2, the drying capacity, vertical mill using the gas conveying material in ground water, larger material which can control the temperature of inlet air, make the product reaches the final moisture, in vertical mill can be drying high moisture of 12 ~ 15% of the material, even drying milling, drying moisture only 3 ~ 4% of the material.

3, the grain size is large, up to about 5% of the diameter of the grinding roll, usually 40 ~ 100 mm, so large and medium-sized vertical mill can be saved two stage crushing.

4, product stability of chemical composition, particle size distribution and uniform. Because the material in vertical mill the stay time of only 2 to 3 minutes, and the ball mill is 15 ~ 20 minutes, so the use of vertical grinding mill, products of chemical composition can be quickly determined, more positive, products chemical composition fluctuation is small, can make an average of. In addition, vertical mill and qualified products can be isolated, to avoid duplication of milling, the particle size uniformity, facilitates calcination.

5, simple technological process, construction area, little occupied space, vertical mill separator, do not need to match powder selecting machine and lifting machine, a grinding dust gas directly into the dust collector to collect for the product, the manufacturing process is simple, compact layout, construction area of only 70% milling system, architectural space about 50 ~ 60% for ball mill.

6, low noise, little dust, pollution, vertical mill in the work, the grinding roller and disk does not directly contact the ball, no ball collision and impact liner impact noise, the low noise, low ratio of ball mill about 20 ~ 25 db. In addition the mill as a whole sealing, system work under negative pressure, so the little dust. A clean environment, adapt to the demands of environmental protection.

7, the metal loss is small, the liner and grinding roller and long service life, high utilization rate, because the vertical mill in work without metal-to-metal contact and collision, so parts less abrasion, long service life, the unit product metal loss is generally 5 ~ 10 g / T, for cement material hardness, grinding roller and the lining life of up to eight thousand hours.