Liming Heavy Industry LM Vertical Coal Mill Helps in Rare and Precious Metal Recycling, "Burning" Out High Value

As one of the core markets for the production and consumption of rare and precious metals globally, China has witnessed an exponential growth in the total amount of industrial solid wastes containing rare and precious metals in recent years. Promoting the recycling of smelting wastes of rare and precious metals can not only avoid environmental pollution and reduce the use of primary resources, but also give birth to new energy-saving and environmental protection industries, forming new economic growth points. With the continuous improvement of environmental protection policies and the improvement of waste recycling mechanisms, the recycling volume of rare and precious metal wastes in China will maintain a growing trend, with a huge market scale.

Another Success Achieved in Coal Powder Preparation Project

In the project of recycling and reusing rare and precious metal resources, industrial furnaces, as the core equipment for high-temperature smelting, their process stability and operational energy efficiency directly affect metal recovery rates and production economy. Industrial furnaces use coal powder as fuel and reducing agent. As a key front-end process in the smelting flow, the scientific and stability of the coal powder preparation link are directly related to the control of smelting temperature, the improvement of reaction efficiency, and the control of energy consumption level in industrial furnaces, thus becoming a key factor affecting the sustainable development and core competitiveness of the project.

To build a clean and efficient fuel supply system, the project party conducted a comprehensive evaluation on the equipment's process adaptability, operational reliability, and energy consumption indicators. Eventually, LM vertical mill one-step clean coal powder preparation system independently developed by Liming Heavy Industry stood out due to its excellent comprehensive performance advantages, winning high recognition and adoption from the customer.

Material: Coal

Fineness: 200 mesh

Application: Coal powder preparation for industrial furnace matching

Equipment: Liming Heavy Industry LM Vertical Coal Mill

Relying on nearly 40 years of technical accumulation and professional advantages, Liming Heavy Industry has accurately targeted the project requirements and tailored a high-standard coal powder preparation production line for users. Built in accordance with stringent standards, the production line features a scientific and rational overall layout. With the LM vertical coal mill as its core equipment, it not only ensures the efficiency of coal powder production but also fully embodies the concept of green environmental protection.

The entire production line operates stably with excellent performance, fully meeting the user's actual needs in terms of production continuity and product quality stability. It has helped the project achieve efficient revenue generation and won high recognition and praise from customers.

Coal Powder Preparation Process Flow

Raw coal is screened through a grid screen from the raw coal yard, then falls onto a steeply inclined belt conveyor or elevator. After iron removal by an electromagnetic iron remover, the raw coal is transported to the raw coal silo for storage via the belt conveyor or elevator.

Once the pulverizing system is fully started, the rod valve at the bottom of the raw coal silo is opened, and the sealed metering rubber belt coal feeder is activated. The raw coal enters the vertical coal mill for drying and grinding.

Hot air or exhaust gas from the hot blast stove is drawn into the vertical coal mill by the system fan. After sufficient heat exchange with the raw coal being ground in the mill, the air carries the coal powder to the separator for classification. Coarse coal powder with unqualified fineness falls back onto the grinding disc for re-grinding, while qualified coal powder is carried by the air flow into the explosion-proof air box pulse dust collector to be collected. Finally, it is discharged into the coal powder silo through the rotary valve.

Advantages of Coal Powder Preparation Equipment

Coal powder serves as a crucial reducing agent and fuel in the furnace. Its composition, fluidity, particle size distribution, and moisture content all affect the velocity gradient of its suspension in the furnace, which in turn influences the performance of the industrial furnace. Therefore, stricter requirements are imposed on equipment selection for the coal powder preparation process.

LM vertical coal mill integrates crushing, grinding, drying, and classification functions. The finished coal powder processed by it has a more uniform particle size, which facilitates more complete combustion. The overall design features significant advantages such as a simple process flow, low energy consumption, minimal pollution, and a high degree of automation.

The system adopts multiple safety measures, including dedicated explosion vents on the main equipment, an inert gas protection system, a CO-O₂ online monitoring system, and a carbon dioxide fire-extinguishing system. These measures provide multiple safety guarantees for the coal powder preparation process, fully aligning with the current development trends of green manufacturing and energy conservation and emission reduction, and offering strong support for the efficient and environmentally friendly operation of rare and precious metal recycling projects.

1. Advanced Technology with Low Investment Cost

Integrating crushing, grinding, drying, powder selection, and conveying functions in one, it features a compact layout and can be arranged outdoors, resulting in low investment costs.

2. Safe and Reliable Operating System

The system is equipped with safety and explosion-proof measures such as CO-O₂ online detection and CO₂ automatic fire-extinguishing system. Its design is safe and reliable, complying with national and industry parameter standards.

3. Strong Drying Capacity

It can use hot air to convey materials. The inlet air temperature can be controlled according to the moisture content of materials, enabling drying of materials with an in-mill moisture content of up to 15% and ensuring the out-mill moisture content is less than 1%.

4. Integrated Comprehensive Solutions

A professional technical service team provides users with integrated comprehensive solutions, including design, supply, installation, training, and after-sales turnkey services, offering convenience and peace of mind.

The successful implementation of the coal powder preparation project supporting large-scale rare and precious metal recycling industrial furnaces has deepened the green development model of resource regeneration and clean energy. Liming Heavy Industry's grinding equipment practices the green mission of "making every gram of resource fully utilized." By enhancing the utilization of coal powder fuel in industrial furnaces, it has opened up a sustainable path for resource recycling, production efficiency improvement, and ecological optimization in rare and precious metal recycling. This makes every link in the resource cycle a brilliant fulcrum empowering the global industrial green transformation.