The characteristics of the energy structure of rich coal

less oil and less gas

coupling with a high external dependence on oil and natural gas and the emphasis on the efficient and clean utilisation of coal

have brought opportunities for coal chemical industry. However

with the large-scale popularisation of coal gasification technology

the production and resulting storage of coal gasification slag continue to increase

which not only result in serious environmental pollution and a waste of terrestrial resources

but also seriously affect the sustainable development of coal chemical enterprises. Hence

the treatment of coal gasification slag is extremely important. In this paper

the production

composition

morphology

particle size structure and water holding characteristics of coal gasification slag are introduced

and the methods of carbon ash separation of gasification slag

both domestically and abroad

are summarised. In addition

the paper also summarises the research progress on gasification slag in building materials

ecological restoration

residual carbon utilisation and other high-value utilisation

and ultimately puts forward the idea of the comprehensive utilisation of gasification slag. For large-scale consumption to solve the environmental problems of enterprises and achieve high-value utilisation to increase the economic benefits of enterprises

it is urgent to zealously design a reasonable and comprehensive utilisation technologies with simple operational processes

strong adaptability and economic benefits.