Longyi Untrafine Vertical Roller Mill for Graphite Calcium Carbonate Limestone Kaolin Powder Production Line

I. Brief introduction.
    Vertical mill is a new set, which is studied by many years, the whole includes the grinding powder, classifier, modified and pneumatic transmission, in accordance with grain bed theory to grinding the material, which can reduce the wear between metals, then increase the powder whiteness; the grinding is high efficiency and lower consumption, because we use the cyclic air grinding and the internal high efficient classifier, we also use the pneumatic transmission to transmit the product, it's convenient and easy to operation and control. The whole set lines are simple, high output, good seal, environmental protection. It's easy to control the product quality and more convenience to exchange the product. It's intelligent and automatic.

II. Application:

It's widely used in producing the limestone, calcite, dolomite, talc, barite, wollastonite, brucite, Calcium hydroxide, gypsum, coking coal, slag, phosphate etc.

III. Economic and technical parameters:

IV. Working principle.

Feeding >>> Grinding >>> Classifying >>> Packing

Motor makes grinding revolve under action of reduction gear. Materials, after being measured by belt scale, are sent to center of grinding disc by feeding screw.

Because of centrifugal force, the materials would move towards the fringe of disc and then enter the grinding zone between grinding roller and disc to be ground. The materials which have been ground would keep moving toward fringe of grinding disc until they spill out of the disc. Through air inducing ring on the fringe of grinding disc, airflow sends these spilling materials to powder classifiers for classifying. The coarse powders which don’t meet the requirement of fineness would fall to the disc for another grinding while these qualified powders, as finished products, would be collected into dust collector and finally sent to finished product silo by conveying system for storage and packaging.

V. Performance and advantages.

>>>Advanced Technology, Reliable Equipment

A. Special grinding curves of grinding roller and grinding disc ensure stable and efficient operation of host machine.

B. Grinding roller takes mechanical position limiter, directly avoiding touching grinding disc. Therefore, destructive collision and violent shocks are avoided.

C. Special sealing design prevents dust from entering the inside of bearing to keep long-term operation of grinding roller.

D. The high-efficiency powder concentrator can freely adjust the particle sizes and ensure the accurate cutting point and reproducibility of products.

• Fineness of finished products can be adjusted flexibly. Primary powder production can reach D97=10μm-20μm while the next powder separation attains D97=4-5μm easily. Finished products have advantages of high content of fine powder, high whiteness and more compact granularity.

• Lingering time of materials in grinding cavity is short. The components and fineness of finished products can be measured and collected quickly, keeping stable quality of finished products.

>>> Smooth Operation, Lower Costs

A. Grinding roller grinds the materials directly. Its energy consumption is 10% lower than other types roller mill and 25-60% lower than that of ball mill.

B. No direct touch between grinding roller and disc and the special wearable alloy materials used in grinding roller shell and lining plates grant a long life expectancy of mill and save the costs on quick-wear parts.

C. Automatic control systems like PLC, DCS and Central Control System can be used to operate machines remotely, saving labor force.

A. Because of no touch between grinding roller and disc, there is no clang and slight vibration. The noise is 20-25 decibel lower than that of ball mill.

B. The whole set of system is fully sealed and operates with negative pressure. Besides, it is equipped with pulse dust collector so the exhaust emission completely meets related national standards.

>>> Eco-friendly Design, Higher Standards

High productivity

The output is 30% higher than that of traditional vertical mills.

Good quality

The fineness is higher than that of peers, the 2μ powder is 7%-8% higher.

Low power consumption

Power consumption is 10% lower than that of peers.

Good product stability

Product stability is far higher than that of peers; customers' viscosity is higher.

High system reliability

Operating rate is up to 95%-99%, which is considerably higher than that of peers.

IV. SERVICE

IIV. SHIPPING

IIIV. CASE