Abstract
For applying calcium-based (Ca-based) solid wastes to renewable source of calcium derived products, different calcium-based solid wastes from coal burnt ash, coal slag and iron slag were tested for dry sorption of HCl. The sorption capacities of Ca-based wastes for HC1 were related to the soluble alkali amount involved, as well as specific surface area of the solid. Coal burnt ash and slag treated by hot water and alkali curing were found to be greatly improved in HC1 sorption capacity, almost equivalent to that obtained by the use of conventional calcium oxide or calcium hydroxide.
