Cement Raw Material Grinding System

Due to the complex composition, high moisture content, and significant differences in grindability of raw materials, Liming Heavy Industry has spent over twenty years developing the LMR energy-saving grinding equipment, integrating drying, grinding, grading, and conveying. This equipment boasts advantages such as high grinding efficiency, low power consumption, large feed particle size, easily adjustable product fineness, simple process flow, small footprint, low noise, low dust emission, easy operation and maintenance, low operating costs, and low consumption of wear-resistant materials. The product's overall performance reaches international advanced levels, meeting the needs of large-scale, intelligent, and intensive industrial grinding. The maximum production capacity can reach 550 t/h, meeting the raw material supply needs of cement production lines with a capacity of 200-2500 t/d.

Product Advantages

High Single-Unit Capacity

The independently developed and manufactured LMR58-4 vertical roller mill has an effective grinding disc diameter of 5.8 meters and a raw material grinding capacity of 550 t/h, allowing a single unit to meet the capacity requirements of large production lines.

Low Power Consumption of the Vertical Mill System

According to actual raw material production test data, using a vertical roller mill can save more than 30% of electricity per ton of raw material compared to a traditional tube mill, demonstrating superior energy-saving performance.

Low Noise

The vertical roller mill's grinding rollers and liners do not directly contact each other during operation, eliminating the metallic impact noise from the steel balls colliding with and striking the liners, as is common in ball mills. Therefore, the noise level is 20-25 dB lower than that of ball mills.

Adjustable Finished Product Fineness

The separator uses a DC motor drive, allowing for adjustments to the speed to meet various product fineness requirements. Furthermore, the raw material vertical roller mill produces relatively uniform particle sizes; generally, a residue of around 12% on an 80mm sieve meets the raw material fineness requirements of rotary kilns. Excessive fineness not only reduces output but also wastes energy and makes differential pressure control difficult.

Construction Scale and System Composition

The conventional capacity of the new dry-process cement production line is 500-5000 tons per day, and the capacity of a small production line is 200-400 tons per day.
It mainly consists of systems such as raw material crushing, raw material homogenization, raw meal grinding, cement firing, clinker cooling and storage, coal powder preparation, clinker batching and grinding station, and finished product packaging.

Working Principle

Material falls into the center of the grinding disc through the feed pipe. The constantly rotating disc, aided by centrifugal force, evenly disperses and flattens the raw material, forming a material bed of a certain thickness. Simultaneously, the material is crushed by multiple grinding rollers on the disc. Driven continuously by centrifugal force, the material moves towards the outer edge of the grinding disc. When the material leaving the disc encounters hot gas entering the mill through the air ring, it rises and enters the separator through the central shell of the mill. During this process, the material undergoes thorough heat exchange with the hot gas, and moisture is rapidly evaporated. The classifier controls the finished particle size at the roller mill outlet. Particles larger than the specified size are separated and fall back to the grinding disc, while material meeting the fineness requirements enters the finished product bin through the classifier.

Structural Features

The composite separator improves classification efficiency.

It has automatic roller lifting and lowering functions, enabling no-load start-up.

It adopts a welded arc-shaped plate seal, which is simple, reliable, and has a good sealing effect.

The turning roller device allows for easy removal of the grinding rollers from the mill for maintenance.

A mechanical limiting mechanism prevents direct metal-to-metal friction and collision between the grinding rollers and the grinding disc, enhancing operational safety.

The low operating pressure of the hydraulic system reduces oil leaks and mill vibration, facilitating operation and management.

The grinding roller bearings utilize centralized circulating lubrication with thin oil, ensuring the bearings operate at low temperatures and with pure grease, effectively extending their lifespan.

Technical Specifications

As a provider of overall solutions for grinding equipment, Liming Heavy Industry insists on providing customers with efficient, energy-saving and environmentally friendly grinding equipment and services.

With nearly 40 years of experience in mill manufacturing, Liming Heavy Industry has launched Raw Material Vertical Mill, which can meet the fineness requirements of users for processing different materials. The products are stable in operation, economical in investment, and green and environmentally friendly!

Enterprise Strength

Liming Heavy Industry is a pioneer in the global powder new materials mineral grinding and resource recycling industries in grinding equipment technology system solutions and services. The company covers a total area of more than 1,600 acres and has served more than 30,000 customers in more than 180 countries and regions. It has obtained more than 280 patents and was the first in the industry to pass ISO9001 international quality system certification, EU CE certification, and Customs Union CU-TR certification.

Focusing on customer needs in different fields, the product processing range covers 1-3mm coarse powder, 20-400 mesh fine powder, 400-1250 mesh ultrafine powder and 1250-3250 mesh micro powder, covering the entire process chain of new material mineral grinding.