| 摘要 |
The invention relates to a process of eliminating high chloride-containing incinerator ash and incinerator ash-residue mixtures, without generating excessive heavy metal-containing effluents during the actual vitrification of the ash. The process involves first pretreating the incinerator ash or ash-residue mixture, if needed, whereby the resultant ash contains less than about 3% halogen by weight and less than about 3% C.. Following the pretreatment, the ash is dried and then mixed with any additives needed to make up a vitrifiable batch mixture which will, when subsequently vitrified, form a glass possessing an excellent acid durability. A durability whereby such that the weight loss of the glass in 5% HCl solution at 95 DEG C. is 2.0 mg/cm2 or less in 24 hours. This durability results in minimal or non-detectable leaching of hazardous heavy metal or non-metallic specie and is sufficient enough durability such that the vitrified glass will easily pass the EPA's test for leachability. A suitable glass meeting the requirements is comprised of, expressed in terms of weight percent, about 47-76% SiO2; 8-29% Al2O3, 3.4-33.0% CaO; and optionally 0-25% R2O, wherein R2O is selected from the group consisting of Na2, Li2O, and K2O; 0-5% Fe2O3; 0-18% B2O3; 0-7% ZrO2; 0-7% TiO2; 0-10% MO, wherein MO is selected from the group consisting of MgO, BaO, ZnO or SrO; 0-8% of at least one member selected from the group consisting of PbO, CdO, Cr2O3, CuO, and NiO; and 0-4% SO3 with 0-4% Cl+F as batched.
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