Detoxification and Recycling of fly ash by mechanochemical treatment

通过机械化学过程的重金属洗脱的预防粉煤灰通过机械化学（MC）过程，涉及通过使用行星式球磨机与氧化钙研磨，然后重金属洗脱效力之间的粉煤灰，MC处理的粉煤灰，和水泥MC过程处理的粉煤灰进行了比较。结果证实了MC处理和胶结防止重金属洗脱。采用不锈钢球磨机对粉煤灰进行MC处理后，Cr^+6的溶出率显著提高，表明有必要改变球磨机材质。MC降解二恶英模拟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处理后的OCDD和OCDF的氯离子的测量表明，约100%的两种化合物脱氯，四至七氯二苯并二恶英/呋喃（T4-H7 CDD/Fs）只检测到痕量水平，没有其他氯化有机化合物被观察到。MC处理后的残留物呈灰色，表明可能发生碳化。结果表明，OCDD和OCDF的降解产物不具有二恶英样内分泌干扰作用。

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.