Limestone Grinding Equipment - Limestone Vertical Mill For High Production And Quality

 Limestone Grinding Equipment - Limestone Vertical Mill For High Production And Quality

Description

With the development of the economy, commercial concrete has become an important member in engineering and construction, and is developing towards the requirements of high-performance concrete and green concrete. Limestone powder is made from the stone chips generated during the production of limestone and mechanism sand, and further ground into fine powder. Through experiments and practical production applications, it has been confirmed that limestone powder, especially when used as a mineral admixture for concrete with a specific fineness of 325 mesh, can greatly improve the workability and workability of concrete, reduce slump loss, improve mechanical properties, increase slump without bleeding. When applied to high-strength concrete, it can reduce the cohesion of concrete and improve its fluidity.

With the increasingly strict requirements for environmental protection in the world, existing coal-fired power plants with sulfur content greater than 1% are constructing desulfurization facilities. The desulfurization process of power plants mainly uses limestone, lime gypsum wet process, accounting for about 86% of the total capacity. The fineness of limestone powder is required to be above 90% for 325 mesh or above 95% for 250 mesh.

In this situation, Hengcheng has made significant technological improvements to the original vertical mill. Developed a large-scale limestone powder grinding equipment, HVM limestone vertical mill. It has the characteristics of low energy consumption, high output, and high product fineness, meeting the product requirements of different industries for limestone powder.
[Application Area]:
Industries such as limestone grinding stations, thermal power plants, commercial concrete stations, etc.
Performance characteristics
1. Change the original reducer speed ratio and adjust the reducer speed for different raw materials through a frequency converter to improve the grinding efficiency of the mill.
2. Two rolls to three rolls. On the basis of not changing the overall framework of the original mill, the two rolls of the mill are changed to three rolls, increasing the grinding area of the mill and increasing its output.
3. The straight blades are replaced with "Z" blades. By changing the original shape and quantity of the dynamic and static separator, the product fineness can reach 325 mesh>95%, increasing production by 10% and reducing energy consumption by 15%.
4. Reasonable system configuration, reduced investment in supporting equipment, and reduced system power consumption.

Limestone Vertical Mill Working principle:

The electric motor drives the grinding disc to rotate through the reducer, and the material falls into the center of the grinding disc from the feeding port. At the same time, hot air enters the grinding chamber from the inlet. Under the action of centrifugal force, the material moves towards the edge of the grinding disc and is crushed by the grinding roller when passing through the circular groove on the grinding disc. The crushed material is carried up by the high-speed airflow at the wind ring at the edge of the grinding disc, and large particles directly fall onto the grinding disc for re grinding. When the material in the airflow passes through the dynamic and static separator, under the action of the rotating rotor, the coarse powder falls onto the grinding disc for re grinding, and the qualified fine powder is discharged with the airflow, Collecting in the powder collection device is the product. Materials containing moisture are dried during contact with hot gases to achieve the required product moisture.

Technical Data

Re:The data based on Mohs'hardness 3-4 material

      Limestone Bond Index≤13kwh/t

Main features of the product

1. Efficient and energy-saving:

(1) High grinding efficiency, low energy consumption, compared to ball mills, energy consumption is 40% -50% lower;

(2) Single machine production capacity is large, and low valley electricity can be utilized;

(3) Vertical grinding technology and equipment are vigorously advocated as new energy-saving and consumption reducing technologies, which are conducive to enhancing the competitive strength of enterprises in the powder industry in this region and even nationwide;

2. Easy maintenance and low operating costs:

(1) The grinding roller can be flipped out of the machine using a hydraulic device, and the replacement of the roller sleeve liner and the maintenance space of the mill are large, making the maintenance operation very convenient;

(2) The grinding roller sleeve can be flipped over for use, extending the service life of wear-resistant materials;

(3) Before starting up, there is no need to place fabric on the grinding disc, and the mill can be started without load, eliminating the difficulty of starting up;

(4) Low wear, special materials are used for the grinding rollers and disc liners, resulting in a long service life;

(5) High degree of automation: The automatic control technology adopts Siemens series PLC from Germany, equipped with an automatic control system, which can achieve remote control and is easy to operate. The workshop can basically achieve unmanned operation, saving operating costs;

3. Low comprehensive investment cost:

Integrating crushing, drying, grinding, and conveying, the process flow is simple, the system equipment is few, the structural layout is compact, and the land area is only 50% of that of a ball mill. It can be arranged outdoors, with low construction costs, directly reducing enterprise investment costs.

4. Stable product quality:

(1) The material stays in the grinder for a short period of time, making it easy to detect the particle size distribution and composition of the product, and ensuring stable product quality;

(2) The product has uniform particle shape, narrow particle size distribution, good fluidity, and strong adaptability.

5. High reliability

(1) Adopting a grinding roller limiting device to avoid severe vibration caused by material breakage during the working time of the mill;

(2) Adopting a new type of roller sealing device, the sealing is more reliable and does not require a sealing fan, further reducing the oxygen content inside the mill and achieving better explosion suppression performance.

6. Environmental protection:

(1) The entire system of HVM vertical grinding machine has low vibration and low noise;

(2) The system is sealed as a whole, operates under full negative pressure, and has no dust leakage, basically achieving a dust-free workshop.