生石灰激发赤泥-粉煤灰协同水泥固化Cu2+污染高岭土的电化学特性

采用生石灰激发赤泥-粉煤灰-水泥对Cu2+污染高岭土进行固化处理,对采用不同配比的赤泥和粉煤灰固化7 d后的Cu2+污染高岭土试件的无侧限抗压强度、浸出率和电化学阻抗谱进行测试.试验结果表明,当赤泥和粉煤灰质量比为7:3时,固化体的无侧限抗压强度最大,Cu2+浸出率最小,电化学阻抗谱法对固化效果的评价与强度和浸出率测试结果一致,说明电化学阻抗谱法是一种评价污染土固化效果的有效方法.

The electrochemical characteristics of Cu2+ contaminated kaolin solidified by quicklime activated red mud-fly ash and cement

Use quicklime to stimulate red mud-fly ash-cement to solidify Cu²⁺ polluted kaolin. The unconfined compressive strength, leaching rate and electrochemical impedance of Cu²⁺ contaminated kaolin specimens solidified with different proportions of red mud and fly ash for 7 days were tested and studied. The test results show that when the mass ratio of red mud and fly ash is 7:3, the unconfined compressive strength of the solidified body is the largest, and the Cu²⁺ leaching rate is the smallest. The evaluation of the curing effect by electrochemical impedance spectroscopy is consistent with the test results of strength and leaching rate, indicating that electrochemical impedance spectroscopy is an effective method for evaluating the curing effect of contaminated soil.