Iron tailings cementing-filling method

The invention relates to an iron tailings cementing-filling method, which belongs to the technical field of mining engineering. The method is characterized in that after cure agent, the weight of which is equivalent to 0.5 to 3 percent of that of tailings dry basis, is firstly mixed into iron tailings pulp; natural settling concentration is performed; base flow is directly pumped to a filling area to be further conducted to bleeding and curing to be served as a bottom layer; and after the bottom layer is cured, the base flow and cure agent, the weight of which is equivalent to 4 to 12 percent of that of the tailings dry basis, are subjected forced stirring and mixing again and then pumping onto the bottom layer to be served as a surface layer. The bottom layer and the surface layer jointly form a filling body. Compared with the prior art, the method sufficiently utilizes the tailings as consolidated fill material, so that the cost is low, the curing effect is good, and the method is novel. In addition, the method of the invention partly solves the problem of the usage of the tailings and provides building material with low price and good quality for the mine filling operation.