水泥窑协同处置含锌粉尘对水泥熟料性能及环境安全性的影响

利用水泥窑协同处置技术对含锌粉尘进行了处置。通过掺入不同量的含锌粉尘煅烧成水泥熟料，探讨含锌粉尘中重金属离子对水泥熟料性能和环境安全性的影响。结果表明，含锌粉尘中的Zn离子可以被有效固化在水泥熟料中，固化率最高可达98.11%；Zn离子在水泥净浆中的浸出浓度低于工业固体废弃物浸出毒性鉴别标准的规定限值，故水泥熟料固化的危险废物在使用中不会对环境造成二次污染。此外，含锌粉尘的加入降低了f-Cao的质量分数，改善了水泥生料的易烧性；在熟料中，各矿物相对重金属元素的固化存在选择性，Zn离子在中间相中的固化率至少为73.04%，远高于其在硅酸盐相中的固化率；同时，背散射图像也表明，Zn离子主要存在于中间相。以上研究结果可为水泥窑协同处置含锌粉尘提供参考。

Effect of cement kiln co-processing of Zinc-containing powders on clinker performance and leaching

An experimental study to handle Zinc-containing powders by cement kiln technology was presented in the paper. Cement clinker was produced with raw meal after adding various amount of Zinc-containing powders; the effect of heavy metal ions confined in Zinc-containing powders on the properties of clinker, and its impact on environment, were then discussed. The results shoued that about 98.11% Zn ions in Zn-contained powders could be solidified into clinker minerals; the concentration of Zn ions leached in cement paste was lower than the requirements as specified in the Standard i.e., hazardous elements as solidified in cement clinker will not lead to secondary pollution to the environment. The addition of Zinc-containing powders reduced the mass fraction of f-Cao and improved the burnability of the cement raw meal. Heavy metal elements could be solidified in various degrees into different minerals. Zn ions solidification rate in the mesophase was greater than 73.04%, which was much higher than the rate in the silicate phase. This study can provide a reference for the co-processing of Zinc-containing powders in cement kilns.