Heavy metal compound passivator

The invention relates to the technical field of metal passivators, in particular to a heavy metal compound passivator which is prepared from, by mass, 20-40 parts of kieselguhr, 1-10 parts of fly ash and phosphorus-rich tailings, 20-30 parts of sepiolite, 10-30 parts of straw powder and 1-10 parts of chitosan, and limestone is added to adjust the PH to be 7-7.6. According to the passivating agent, underground water pollution caused by phosphate used as an existing passivating agent is changed, and the problems that a traditional passivating agent takes effect slowly, and copper, zinc, cadmium and chromium in bottom mud and excrement cannot be subjected to short-term passivation and long-term passivation directly are solved. 本发明涉及金属钝化剂技术领域，具体涉及一种重金属复配钝化剂，以质量计，原料包括以下组分：20份～40份硅藻土、1份～10份粉煤灰和富磷尾渣、20份～30份海泡石、10份～30份秸秆粉末、1份～10份壳聚糖，加入石灰石调节PH为7～7.6；本发明改变了现有钝化剂用磷酸盐而导致地下水污染，也解决了传统钝化剂见效缓慢，无法直接对底泥和粪便中铜、锌、镉、铬进行短期钝化和长效钝化。