Coal gangue is a black-gray rock formed alongside coal seams during the coal formation process. It has a relatively low carbon content and is harder than coal, while also containing a variety of valuable minerals. You might be wondering—can coal gangue be used as gravel? And what about the cost of the equipment needed to process it into construction stone?
Can coal gangue be used as gravel?
After being crushed and processed, coal gangue can be used as gravel for application in road foundation stones, brick-making raw materials, infrastructure construction and industrial raw materials.
Precautions
Organic matter content: The organic matter content in coal gangue should be less than 5%; otherwise, it is prone to increase brittleness and insufficient strength.
Physical properties: The density of coal gangue is lower than that of bluestone, and its hardness is uneven. Therefore, the particle size needs to be controlled through screening.
What kinds of machines are used for processing coal gangue into gravel?
Coal gangue is a solid waste produced during coal mining and washing. According to its main mineral components, it can be classified into clay rock type, sandstone rock type, carbonate type and aluminous rock type. Its Mohs hardness ranges from 3 to 7. Therefore, among various crushing equipment, jaw crushers, hammer crushers and double-roller crushers are more suitable. Specifically, factors such as the moisture content of coal gangue, expected output, finished product particle size requirements, budget and working environment need to be comprehensively considered.
Jaw Crusher
By adopting the principle of extrusion crushing, jaw crusher ensures smooth operation without blockage—even when processing large raw material particles. The deep, thoughtfully designed crushing chamber enhances throughput efficiency, while optimized motion parameters allow materials to begin crushing at the upper section of the chamber. With a larger lower stroke and higher crushing ratio, the machine delivers superior performance. A wedge block adjustment device enables precise and convenient control of the discharge opening, ensuring uniform and adjustable product particle size. The integrated flywheel structure helps reduce vibration, allowing for smoother and quieter operation. Additionally, the integrated motor base and main unit design simplifies installation, saves space, and enhances overall stability.
Hammer Crusher
The crusher efficiently breaks down materials through the high-speed rotation of its hammer heads, eliminating the need for preliminary crushing and enabling single-step size reduction and shaping for both large and small feed materials. By adjusting the chamber configuration, it can easily switch between coarse, medium, and fine crushing to meet varying processing needs. Its grate-free design ensures reliable performance when handling moist coal gangue, significantly reducing the risk of blockages. Additionally, an adjustable plate in the forming zone allows smaller particles to pass through directly, minimizing over-crushing and helping to boost overall productivity while reducing the generation of fines.
Double Roller Crusher
Double roller crusher is ideal for processing coal gangue with a particle size under 30 mm. After removing iron and other impurities, the material can proceed directly to the crushing stage—eliminating the need for additional gangue separation steps and making the coal selection process more efficient and simple. The machine uses two counter-rotating rollers to crush materials, offering a compact design combined with a high crushing ratio. It delivers large throughput, consistent output particle size, and a low rate of overcrushing. Equipped with a dual-motor drive system, it provides reliable power, enhances crushing efficiency, and helps reduce energy consumption and overall production costs. It is well-suited for both medium and fine crushing applications.
What is the price of the coal gangue crushing machine?
The current market price for coal gangue crushing machinery generally ranges from tens of thousands to hundreds of thousands of Yuan. The variation mainly depends on the type and model of equipment. Equipment from well-known brands tends to be priced higher, offering reliable performance and durability, while options from smaller or mid-sized brands may be more affordable but require careful evaluation in terms of quality.
Luoyang Dahua Heavy Industry is a high-tech enterprise with research & development production, sales, and service. The mobile crushing station has been successfully applied in domestic and foreign mine crushing projects. The company has a professional R & D team, a strong after-sales team, from the equipment selection, site inspection, equipment manufacturing, installation, commissioning, delivery and other aspects for your service.