How to process coal based solid waste?

Solid waste is generated during the process of coal mining and utilization, such as coal gangue generated during coal mining, fly ash generated during coal combustion and utilization, and gasification ash generated during coal chemical conversion. These are all coal based solid waste, which belongs to the category of bulk solid waste due to their large production volume.

Improper treatment of coal based solid waste can cause water, air, and soil pollution. At present, the development of China's circular economy is facing prominent problems such as insufficient utilization of bulk solid waste and low added value of comprehensive utilization products. Higher requirements have been put forward for the treatment of coal based solid waste, gradually shifting from reduction treatment to resource utilization, high value utilization, and large-scale utilization, so as to generate greater social and economic benefits. A portion of combustible carbon remains in coal based solid waste, and ash is rich in aluminum silicon based compounds, which have dual properties of fuel and raw materials. The coal gasification process produces gasification coarse and fine slag. For coal based solid waste with different carbon contents, the gasification coarse slag with higher carbon content mainly follows the principles of large-scale and high-value treatment, and is transformed and utilized.

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