Flow-dividing and speed-dividing flotation method for micro-fine particle embedded complex refractory iron ore

The invention relates to a flow-dividing and speed-dividing flotation method for micro-fine particle disseminated complex iron ore, which is characterized by comprising the following steps: (1) crushing, grinding and mixing the micro-fine particle disseminated complex refractory iron ore to obtain flotation ore pulp; (2) after a pH regulator, a dispersing agent, an inhibitor and a collecting agent are added, flotation is conducted on the fine-grained iron ore concentrate through the flow of roughing I, scavenging I, concentration I and concentration II at different speeds, and the fine-grained iron ore concentrate is obtained; (3) after a pH adjusting agent, a dispersing agent, an inhibitor and a collecting agent are added, the coarse-grain iron ore concentrate is floated in a flow of roughing II, coarse-grain scavenging I, coarse-grain scavenging II and concentration III at different speeds in a controlled mode, and the coarse-grain iron ore concentrate is obtained; and (4) the obtained fine-grain iron ore c