Tailing harmful substance separation system for preparing green building materials

The utility model relates to the technical field of separation of harmful substances in tailings, in particular to a separation system for harmful substances in tailings, which is used for preparing green building materials. The system comprises a roasting furnace used for roasting and separating sulfides in tailings, so that the sulfides in the tailings are oxidized to generate sulfur dioxide; the gas separation chamber is used for separating sulfur dioxide from the waste gas discharged from the roasting furnace; the number of the gas separation chambers is multiple, each gas separation chamber is connected to the roasting furnace through a waste gas pipe, and a first valve is arranged on each waste gas pipe; at any moment, at least one first valve is opened, so that at least one gas separation chamber is communicated with the roasting furnace. Harmful elements contained in the tailings can be separated out, the safety and the environmental protection property of green building materials prepared from the ta