Slag Vertical Mill: Grinding Process in Solid Waste Resource Utilization
The slag vertical mill plays a pivotal role in the global effort to resourceize industrial solid waste, specifically targeting granulated blast furnace slag (GBFS). This mill is engineered to transform this by-product of steelmaking into high-value ground granulated blast furnace slag (GGBS), a premier supplementary cementitious material (SCM) for the construction industry.
The core of the process is the dry grinding of GBFS, which consists of glassy granules with latent hydraulic properties. The vertical mill's configuration is ideal for this task. Moist slag (with inherent surface moisture) is fed onto a rotating grinding table. Hydraulically loaded rollers compress and shear the material bed, causing size reduction.
A key feature is the integration of a hot gas generator, which provides a stream of hot air (up to 300-400°C) that sweeps through the grinding zone. This accomplishes two critical functions simultaneously: drying the slag to below 1% moisture (essential for efficient grinding and final product stability) and transporting the ground particles upward to a high-efficiency dynamic classifier.
A key feature is the integration of a hot gas generator, which provides a stream of hot air (up to 300-400°C) that sweeps through the grinding zone. This accomplishes two critical functions simultaneously: drying the slag to below 1% moisture (essential for efficient grinding and final product stability) and transporting the ground particles upward to a high-efficiency dynamic classifier.
