Slag Granulation

Granulation of Blast Furnace slag is a very attractive option since it turns the Blast Furnace slag into a valuable by–product that can be sold to the cement industry. Blast Furnaces normally generate 200 to 400 kg of liquid slag for every ton of hot metal produced. Until 10–15 years ago, Blast Furnace slag was considered a waste product and was being dumped at a convenient place away from the Blast Furnace. The use of granulated Blast Furnace slag replacing clinker for cement production is now accepted worldwide with the end result being a high quality cement, comparable to that of conventional Portland cement, at an attractive cost. The dumping and accumulation of large amounts of Blast Furnace lump slag can so be avoided which reduces the intensity of use and maintenance of the dry slag pits and the associated environmental issues. An additional benefit when using Blast Furnace slag for cement production is the reduction in CO2 emission. For every ton of clinker that is replaced by granulated Blast Furnace slag there is one ton less CO2 emission.