Annual production of 250,000 tons of coal gangue pulverizing project

Gangue is a solid waste generated during coal mining and washing, mainly composed of a mixture of rocks, coal dust and other minerals. It usually appears in black or gray blocks, with high hardness and density. The utilization of coal gangue is of great significance. From an environmental protection perspective, a large amount of accumulated coal gangue occupies land resources and may pollute soil, water and air. Its effective use can reduce environmental pollution and improve ecology. From a resource perspective, coal gangue contains a certain amount of carbon and other useful minerals, which can be extracted and utilized through technical means to convert waste into resources, improve resource utilization, and alleviate resource shortage pressure.

Project overview:

This project is a coal gangue processing and pulverizing project. User focus on innovative resource utilization and deeply study the cutting-edge technology and process of coal gangue processing. Relying on an advanced R&D team and rich industry experience, the user is committed to turning coal gangue, which was originally regarded as waste, into treasure. Through a series of sophisticated processing processes, the efficient resource utilization of coal gangue is achieved, which effectively reduces the environmental pollution caused by the accumulation of coal gangue. It also provides the market with a variety of high-quality products. The kaolin products produced are widely used in coatings, wires and cables, high-grade glass fibers and other fields, promoting the vigorous development of the comprehensive resource utilization industry and contributing important forces to the circular economy.

After a comprehensive and multi-faceted investigation in the early stage of the project, the user finally chose to use the LM series vertical roller mill of Liming Heavy Industry. The entire production line of this project was built by Liming Heavy Industry. The production site is reasonably designed, compactly laid out, low-carbon and environmentally friendly, and has high operating efficiency!

Raw materials: coal gangue (coal-based kaolin)

Equipment used: LM vertical roller mill

▲Liming Heavy Industry LM vertical roller mill coal gangue powder production line

▲Liming Heavy Industry LM vertical roller mill installation guidance site

Equipment selection:

Liming Heavy Industry LM vertical roller mill integrates grinding, drying, powder selection and transportation, and meets the high standards of limestone grinding. It can not only achieve high product purity and precise particle size control, but also save energy and reduce consumption, and has a high degree of intelligence. It can produce stably and continuously for 24 hours. Users can make diversified choices based on production, fineness, investment and other requirements.

Technical advantages:

1. Leading technology and low investment cost

Integrating crushing, grinding, drying, powder selection and transportation, the layout is compact, and it can be arranged in the open air, which greatly reduces the investment cost.

2. High grinding efficiency and good product quality

Special grinding roller and grinding disc structure design, high grinding efficiency; uniform particle size distribution of finished products, and good quality of finished powder.

3. Reliable quality and stable operation

The grinding roller is equipped with a limit device to avoid direct contact between the grinding roller and the grinding disc, with low vibration; it has an automatic slag discharge function to ensure the safe operation of the equipment.

4. Large drying capacity and wide adaptability

Hot air can be used to convey materials, dry materials with a moisture content of up to 15% entering the mill, and the moisture content out of the mill is less than 1%, with a wide range of adaptability.

5. High degree of automation

The automatic control system is used to achieve remote control, interlocking protection, reliable operation, and easy operation.

6. Easy maintenance and low operating cost

The grinding roller is lubricated with forced thin oil and equipped with a hydraulic roller turning device. During maintenance, the grinding roller can be turned out of the machine by the hydraulic device without disassembly, which is convenient and quick.

Process flow:

The main motor drives the grinding disc to rotate through the reducer. At the same time, the wind enters the mill from the air inlet. The material falls on the center of the grinding disc through the discharge port of the spiral feeder. Under the action of centrifugal force, the material moves evenly from the center of the grinding disc to the edge. When passing through the grinding roller area on the grinding disc, it is crushed by the grinding roller. Large pieces of material are directly crushed, and fine particles are squeezed to form a material bed for inter-particle crushing. The crushed material continues to move to the edge of the grinding disc until it is taken away by the strong airflow at the wind ring, and the larger particles fall back to the grinding disc to continue to be crushed. When the material in the airflow passes through the upper separator, the coarse particles return to the grinding disc for grinding under the action of the separator blades. Qualified fine powder is discharged from the mill with the airflow and collected by the system's powder collector. The collected powder is the product of the vertical mill. When iron blocks and other debris mixed in the materials move to the edge of the grinding disc with the materials, they cannot be blown up by the wind due to their own weight and fall into the lower cavity of the mill. They are scraped into the slag discharge port by the scraper installed at the bottom of the grinding disc and discharged out of the machine.