利用石灰干化污泥制备水泥对水泥性能的影响

Efect of utilizing lime mediated sludge to produce cement on cement performance

使用石灰干化污泥作为水泥原料的部分代替品制备水泥，石灰干化污泥质量分数变化范围在0-30％时探讨了石灰干化污泥的加入对水泥各项性能的影响．结果表明：石灰干化污泥以15％的加入量掺入生料后，可以明显改善水泥熟料的煅烧性能、矿物相晶体结构及形貌，并且能够显著增强水泥强度．当石灰干化污泥掺量继续增加后，其对于水泥性能的改善作用逐渐下降，当添加量达到30％时制得的水泥性能与未加入污泥的水泥已相差不大．毒性浸出实验结果显示：加入石灰干化污泥后，熟料和水泥的重金属含量较未加入污泥时高，但浸出量很低，浸出液中Cu、Zn、Pb、Cr和Ni的质量浓度均在lmg．L-1以下，远低于国家标准GB5085．3—2007，不会产生二次污染．

Lime mediated sludge Was Used as partial replacement for cement raw materials to produce cement. The adding amount of lime mediated sludge ranges from 0 to 30%. The influence of lime mediated sludge on cement performance was investigated. It is shown that adding 15% of lime mediated sludge into cement raw materials can significantly improve the calcining performance, the mineral phase crystal structure and the clinker＇s morphology, and the cement strength is also remarkably enhanced. The improvement capability of lime mediated sludge gradually declines with the increase of lime mediated sludge. When 30% of lime mediated sludge is added, the properties of the obtained cement are similar to those without adding sludge. Toxicity characteristic leaching test results indicate that after lime mediated sludge addition, heavy metalconcentrations in clinker and cement are higher than those in clinker and cement without lime mediated sludge, while the leaching concentrations are very low, Cu, Zn, Pb, Cr and Ni contents in the leachate are all below 1 mg-L-1, which canmeet the People＇s Republic of China Standard GB 5085.3--2007, with no risks of secondary pollution.