What are the ways of coal gangue recycling?

（1）As lightweight fine aggregate concrete, it is conducive to improve the performance of concrete

（2） Preparing new concrete to replace red brick or sintered coal gangue brick as wall can not only reduce the weight of wall, improve seismic and safety performance, but also replace 40% – 70% of cement

（3） Fill the road section to improve the density, durability and crushing resistance of subgrade materials. At the same time, it improves the unconfined compressive strength, splitting resistance and compressive resilience modulus of subgrade, and meets the relevant technical requirements of class II Highway.

（4） It is used for the repair and construction of bridge deck and pavement, increase the bonding force and mechanical bite force between particles, and improve the anti disturbance and crack resistance.