A comprehensive utilization method for
coal ash
solid waste comprises the following steps:
grinding and sieving
coal ash after being calcined, and soaking in a
hydrochloric acid of 20-30%
mass concentration to respectively obtain ferro-
aluminium chlorination liquor and
solid residue; adding Ca(OH)2 and Al(OH)3 in the ferro-
aluminium chlorination liquor, and adjusting the basicity to 45-55%, controlling the pH value at 3.5-5.0 through the
hydrochloric acid, performing water thermal
polymerization at the temperature of 105-110 DEG C, and obtaining a poly ferro-
aluminium chlorination liquor after concentration and
drying; washing and
drying the
solid residue, adding Ca(OH)2 at the
molar ratio of n(Ca)to n(Si) of 5:6, adding NaOH at the
molar ratio of n[Ca(OH)2] to n(NaOH) of 1:(0.5-1.5), and performing
thermal reaction at the temperature of 180-220 DEG C to obtain a
tobermorite sewage disposal material. According to the method, a comprehensive solution that
aluminium oxide and a small amount of
ferric oxide and
calcium oxide in the
coal ash are adopted to prepare poly ferro-aluminium chlorination purifying agent, and the components of
silicon dioxide are adopted to prepare the
tobermorite sewage disposal material is offered, so that the purpose that the coal ash is comprehensively used to prepare the environment material with higher added value is achieved.