METHOD FOR PREPARING COHESIVE AGENT OF POLYALUMINUM HYDROXY CHLORO-SULFATE SILICATE FOR WATER-TREATMENT AND COHESIVE AGENT PREPARED THEREBY

摘要

PURPOSE: To provide a cohesive agent, which shows stability and good cohesive capacity at a basicity of not less than 70%, and a method for preparing the cohesive agent. CONSTITUTION: The method comprises the steps of (a) mixing 15-28 wt.% of Al(OH)3 having Al2O3 concentration of 40-68%, 50-75 wt.% of HCl at a concentration of 25-35%, 0.5-10 wt.% of H2SO4 at a concentration of 50-98%, and 0.6-25 wt.% of water; (b) reacting the mixture obtained from the step (a) at a temperature of 90-125 deg.C for 5-20 hours to prepare AlClSO3 having Al2O3 concentration of 9-14% and basicity of not more than 10%; (c) mixing 46-75 wt.% of AlClSO3 obtained from the step (b), 10-25 wt.% of NaOH having Na2O concentration of 15-40%, 0.01-10.0 wt.% of Na2SiO3 having SiO2 concentration of 5-40%, and 15-35 wt.% of water; and (d) reacting the mixture obtained from the step (c) at a temperature of 30-60 deg.c with velocity gradient of 1.000 second to prepare Al2(OH)3Cl2(SO4)2(SiO2).