Chinese steel maker BaoSteel announced that TISCO has achieved breakthrough results in the trial production of high acid coefficient mineral wool products from blast furnace slag. TISCO built the first domestic blast furnace hot molten slag mineral cotton production line in September 2014, and has mastered the technology through years of production. In March 2021, Baowu formed a project team to cooperate with relevant universities in China and proposed to use the TISCO mineral wool production line as a test platform to organize industrialization tests and to realize, through measures like adjusting the ratio of tempering materials, melting and fiber temperature, the production of 1.6-2.0 high acidity coefficient 1.6-2.0 rock wool under the condition where hot slag percentage of more than 50%. By adapting and optimizing relevant equipment, TISCO’s blast furnace hot slag wool production line has been successfully upgraded from mineral wool to high-grade rock wool, which will improve the hot slag wool making technology, expand the product types and enrich the hot slag technology. More importantly, it has explored an effective path for Baowu in the field of sensible heat recovery, efficient utilization of blast furnace slag, reducing carbon emissions, and by-products management in the steel industry.Blast furnace hot slag can be converted into mineral wool mainly because its composition is similar to basalt, which is a raw material for the production of mineral wool.Mineral wool, in addition to its features such as light weight, durability, flame retardant, and non-corrosion, is excellent thermal insulation and sound-absorbing material and is widely used in areas such as industrial thermal engineering, refrigeration equipment and green buildings.