冶金渣基胶凝材料固化生活垃圾焚烧飞灰的性能研究

以矿渣、钢渣、脱硫灰和磷酸淤渣为原材料，优化4种原料的配合比，制备出冶金渣基胶凝材料，考察其对垃圾焚烧飞灰中重金属的固化性能。结果表明：当m（矿渣）：m（钢渣）：m（脱硫灰）：m（磷酸淤渣）=36%：32%：12%：20%时，冶金渣基胶凝材料净浆试块的抗压强度达35.2 MPa。随着垃圾焚烧飞灰掺入量从10%增加到80%，固化体的强度不断下降；但是，当垃圾焚烧飞灰掺量高达到80%时，固化体抗压强度仍达2.2 MPa，Pb、Zn、Cr、Hg和As的固化率仍超过99%，垃圾焚烧飞灰固化体的抗压强度和重金属浸出浓度均满足《生活垃圾卫生填埋场污染控制标准（GB 16889—2008）》的要求。

Solidification of Municipal Solid Waste Incineration Fly Ash with Metallurgically Based Cementitious Materials

The metallurgically based cementitious materials were prepared by optimizing the mass ratio of blast furnace slag, steel slag, desulfurization ash and phosphoric acid sludge. The immobilization performances of heavy metals in Municipal Solid Waste Incineration (MSWI) fly ash were evaluated by using metallurgically based cementitious materials as binding agent. The results showed that the compressive strength of cement paste for metallurgically based cementitious materials reached 35.2 MPa with the mass ratio of blast furnace slag, steel slag, desulfurization ash and phosphoric acid sludge of 36%: 32%: 12%: 20%. When the mixing ratio of MSWI fly ash increased from 10% to 80%, the compressive strength of solidified matrix decreased gradually. However, while the mixing ratio of MSWI fly ash was as high as 80%, the compressive strength of solidified matrix still reached 2.2 MPa, and the immobilization rates of Pb, Zn, Cr, Hg and As were higher than 99%. The leaching concentration of heavy metals and the compressive strength of solidified matrix well met the requirements of 《Standard for Pollution Control on the Landfill Site of Municipal Solid Waste (GB 16889-2008)》.