Lime sandstone prodn. - using paper pulp ash as moisture sensitivity reducing additive

摘要

Lime sandstone is produced from lime sandstone mortar to which is added paper pulp ash of compsn. (by wt.) 1-45% CaO, 25-55% SiO2, 20-45% Al2O3 and 0-2% MgO. Paper pulp ash is produced by dewatering paper pulp from paper and cardboard mfr. and then asking the dewatered pulp at a bore 400 deg.C. Also claimed is the use of paper pulp ash, which has been ashed at above 400 deg.C, for the prodn. of lime sandstone.