Method for injecting solidified tailings into collapse pit

The invention discloses a method for injecting solidified tailings into a collapse pit. A process for injecting solidified tailings into the collapse pit comprises 16 work procedures. Each work procedure comprises the following technical processes that 1, total tailings enter a 45m-diameter concentrator; 2, total tailings processed by the 45m-diameter concentrator enter an 18m-diameter concentrator; 3, the ore pulp concentration of total tailings processed through the 18m-diameter concentrator reaches 45 to 55 percent; the total tailings with the ore pulp concentration reaching 45 to 55 percent enter a fifth-work-procedure slag slurry pump; the clean water partially enters a fourth-work-procedure overflow groove; 4, clean water in the overflow groove returns to a 50m-diameter concentrator in a tailing workshop; 5, the total tailing slurry with the concentration reaching 45 to 55 percent is conveyed to a stirring barrel through a slag slurry pump in the sixth work procedure; 7, cement feeding materials enter a cement cabin; and 8, the cement in the cement cabin enters a spiral feeding machine. The method has the advantages that the warehouse volume of a tailing warehouse is relieved; the ground surface environment damaged by mining activities is controlled; and conditions are created for land reclamation and ecological environment rebuilding.