Detoxification and Recycling of fly ash by mechanochemical treatment

利用行星球磨机对飞灰进行机械机械(MC)处理，比较了机械机械(MC)处理后的飞灰、MC处理后的飞灰和胶凝MC处理后的飞灰对重金属的洗脱能力。结果证实，MC处理和胶结可以防止重金属的淋洗。当采用不锈钢球磨机对飞灰进行MC处理时，MC处理后的飞灰中铬的洗脱率显著提高，表明有必要改变球磨机的材质。MC法降解二恶英类化合物、八氯二苯并对二恶英(OCDD)和八氯二苯并呋喃(OCDF)。MC处理OCDD和OCDF后的氯离子测量表明，这两种化合物的脱氯率都达到了100%，仅在痕量水平上检测到了四到七氯的二苯并-对二恶英/呋喃(T4-H7CDD/FS)，没有观察到其他氯化有机化合物。MC处理后的残留物呈灰色，表明有碳化的可能性。这些结果使我们可以预期OCDD和OCDF的降解产物没有二恶英样的内分泌干扰效力。

Prevention of heavy metals elution by a mechanochamical processFly ash was treated by a mechanochamical (MC) process that involved milling with calcium oxide by using a planetary ball mill, and then heavy metals elution potencies among fly ash, MC-treated fly ash, and cemented MC process-treated fly ash were compared. The results confirmed prevention of heavy metals elution by MC treatment and cementation. When a stainless ball mill was used in MC treatment of fly ash, elution of Cr^<+6> from MC-treated fly ash was significantly enhanced, thereby indicating necessity of a change in the material of ball mill.MC degradation of dioxinsModel dioxin compounds, octachlorodibenzo-p-dioxin (OCDD), and octachlorodibenzofuran (OCDF) were degraded by a MC process. Measurements of chloride ions after MC treatment of OCDD and OCDF showed about 100% dechlorination of both compounds ; tetra- to heptachlorinated dibenzo-p-dioxins/furans (T4-H7CDD/Fs) were detected only at trace levels, and no other chlorinated organic compounds were observed. The residue after MC treatment was gray in color, indicating the possibility of carbonization. The results allow us to expect that the degradation products of OCDD and OCDF have no dioxin-like endocrine disruption potency.