Mineral processing technology of large horizontal sand mill for iron ore

The invention discloses a beneficiation process for iron ore by using a large horizontal sand mill, which comprises the following steps: step 1, carrying out primary ball milling, screening and primary rough magnetic separation on materials, after the primary rough magnetic separation, enabling one part of qualified materials to enter the next step, and carrying out tailing fishing on the other part of residual materials; 2, the qualified materials are subjected to second-stage ball milling, cyclone classification and high-frequency fine screening, after high-frequency fine screening, one part of the qualified materials enter the next step, and after concentration magnetic separation is conducted on the other part of the remaining materials, tailing fishing is conducted; 3, qualified materials are conveyed to a moxa sand mill to be subjected to fine grinding, then primary fine magnetic separation and secondary fine magnetic separation are sequentially carried out, after the primary fine magnetic separation an