Consolidating ash - by using hardenable binder of water glass and aluminium phosphate hardener

摘要

Consolidation of granular and pulverulent ashes, esp. boiler ashes and salts from flue gas scrubbing in special waste incineration plants, is carried out using a hardenable binder of waterglass with aluminium phosphate hardener. Pref. the hardener is uniformly dispersed in the dry waste, a 25-50 (pref. 30-45)% waterglass soln. is mixed in and then the mixt. is hardened, pref. in moulds. The waste is pref. mixed with at least 10% hardener (based on waste-hardener mixt.), pref. 20-30 (esp. 30)% hardener in the case of boiler ash and pref. more than 20 (esp. 30)% hardener in the case of salts. After addn. of at least 30% waterglass (calculated as solids and based on 100% waste-hardener mixt.), pref. 25-80 (esp. 30-35)% sodium waterglass in the case of boiler ash and pref. 38-45% waterglass in the case of salts, the mixt. is hardened. ADVANTAGE - The product has much improved elutriation resistance and does not require special storage dumps.