Alkaline Zn-air battery has high mass specific energy, high mass specific power, stable operating voltage and low cost. The whole world pays much attention to its development.

During the extracting process, four main factors, namely solid: liquid ratio, immersing time, extraction temperature and extraction time were studied by using single factor analysis method.

In this paper, fly ash was applied to remove the fluoride of wastewater and every single-factor experiment was done, which influenced the removal ratio of fluoride.