Comprehensive utilisation of blast furnace slag

China is the world's largest steel producer, with the China Iron and Steel Association estimating that the country's crude steel production in 2022 will be 935 million tonnes [Citation1]. In 2017, the metallurgical slag output of iron and steel enterprises in China reached more than 440 million tons, including 247 million tons of blast furnace slag and 101 million tons of converter slag [Citation2]. After the accumulation in recent years, the current number of waste blast furnace slag in China is huge. By 2020, the total amount of industrial solid waste in China will reach 3.787 billion tons, of which metallurgical slag is 689 million tons, accounting for 18.19%, which is the third largest industrial solid waste after tailings and gangue, not only occupying enterprise land, but also polluting the environment, endangering biological and human health, in order to achieve the comprehensive utilisation of blast furnace slag and improve the economic benefits of the steel industry, this paper will introduce the current status quo of comprehensive utilisation of blast furnace slag from the current blast furnace slag sensible heat recovery of molten steel.