Baking-free brick taking iron tailings as raw material and preparation method of baking-free brick

The invention aims to provide a baking-free brick taking iron tailings as a raw material and a preparation method of the baking-free brick in order to solve the problems of baking-free bricks in the prior art. The baking-free brick provided by the technical scheme of the invention is prepared from the following raw material components in percentage by weight on a dry basis: 40-81% of aggregate; 9-50% of a cementing material; 2-15% of water; 0.05 to 0.2 percent of a water reducing agent; the cementing material comprises the following raw materials in percentage by weight: 20-60% of steel slag, 0-60% of granulated blast furnace slag, 10-30% of gypsum and 0-30% of desulfurized fly ash. The iron tailings with the fineness modulus smaller than 0.7, the steel slag, the desulfurized gypsum, the desulfurized fly ash and other industrial solid wastes are adopted, the cost is reduced, meanwhile, the strength of the product is guaranteed, the product can be suitable for baking-free bricks of various strength grades, and