GGBS (Ground Granulated Blast Furnace Slag) Production Solutions — turn steel-mill by-product into a high-value, low-carbon supplementary cementitious material. Two proven grinding routes, capacity 10 to 300 tonnes per hour.
Overview
A slag grinding plant grinds granulated blast furnace slag into a fine powder (GGBS) that replaces 30-70% of Portland cement in concrete — improving durability and cutting carbon emissions.
When iron is smelted in a blast furnace, the molten slag that floats on the iron is tapped off and rapidly quenched in water. This "granulation" freezes the molten slag into a glassy, amorphous sand — granulated blast furnace slag (GBFS). While GBFS has latent hydraulic properties, it is too coarse to react at a useful rate. Grinding it to a fineness of 400-600 m²/kg (Blaine) activates it, producing GGBS — a premium supplementary cementitious material (SCM).
GGBS is blended with Portland cement at the grinding station (producing Portland Slag Cement) or added directly at the concrete batch plant. The result is concrete with higher long-term strength, lower heat of hydration, better sulfate and chloride resistance, and a significantly lower carbon footprint — roughly 0.07 t CO₂ per tonne of GGBS versus 0.85 t per tonne of clinker.
A LIMING slag grinding plant takes wet or dry GBFS from the steel mill and produces finished GGBS powder with target fineness and moisture, ready for silo storage and bulk dispatch. Capacities range from 10 t/h for a small standalone plant to 300 t/h for a large-scale grinding terminal.
Why GGBS
Grinding slag into GGBS delivers a rare double win — it converts industrial waste into a premium product and cuts the carbon intensity of concrete at the same time.
GGBS emits ~0.07 t CO₂/t versus 0.85 t for clinker — replacing 50% clinker halves concrete carbon.
Higher sulfate, chloride, and alkali-silica resistance for longer-life concrete in aggressive environments.
Reduced heat of hydration — ideal for mass concrete in dams and large foundations.
Turns steel-mill by-product into a profitable binder, closing the industrial material loop.
Process
Wet GBFS is dried, ground, classified, and stored — all in a closed, dust-controlled circuit.
Equipment Routes
LIMING supplies both modern grinding routes — choose by capacity, energy cost, and operator experience.
A single vertical roller mill grinds, dries, and classifies GBFS in one machine — the lowest-energy and most compact route for new plants.
A roller press pre-grinder feeds a ball mill in closed circuit with a separator — flexible operation and the classic choice for retrofits and smaller plants.
Capacities
LIMING slag grinding plants span from small standalone terminals to large-scale grinding stations serving national markets.
| Tier | Hourly Output | Annual Output | Recommended Route | Typical Market |
|---|---|---|---|---|
| Small Terminal | 10-30 t/h | ~60-200 kt/year | Ball mill + roller press | Local concrete supply |
| Mid Plant | 30-100 t/h | ~200-700 kt/year | Vertical mill or BM+RP | Regional cement blending |
| Large Station | 100-300 t/h | ~700-2,000 kt/year | Vertical roller mill | National / export market |
Key Advantages
Engineered for low energy, stable fineness, and long campaigns on abrasive slag.