Slag melt is to a high state of rapid cooling of the product placed in water, also known as water quenched blast furnace slag, a byproduct of ironmaking produced, known as slag in the cement industry, the main blast furnace slag water quenching or water quenching in two ways. Slag is mainly used for the production of cement, either as a cement mixture, can also be made non-clinker cement. After fine grinding blast furnace slag can be used as the main raw material for the production of slag powder. It can replace silicon bath soil insulation packing and save cost. It can be used for the production of slag bricks and wet grinding slag concrete products. It used for thermal insulation filler.