The invention relates to a mixed ore
high pressure roll milling dual-media
magnetic separation-
hematite ore sorting process. The process is characterized by comprising the following steps that raw ore is subject to coarse breaking and medium breaking two-section breaking and screening until the content of products with the
granularity reaching -25 mm being 90% or above, then the material is fed into a
high pressure roll milling-wind hierarchy
system, and the content of products with the
granularity being -200 meshes is 60%-65%; and the material is fed into a first-section low-intensity
magnetic separator and a first-section
high intensity magnetic separator for sorting, first-section low intensity
magnetic separation concentrate and first-section
high intensity magnetic ore are fed into a
tower mill to be milled until the content of products with the
granularity being -325 meshes is 90% or above, the products are fed into a second-section low-intensity
magnetic separator, a third-section low-intensity magnetic separator, a first-section magnetic vibrating
concentrator and an anion
reverse flotation operation, concentrate with the grade being 67%-67.5% is obtained, and first-section
high intensity magnetic separation tailing, second-section low intensity magnetic separation tailing, third-section low intensity magnetic separation tailing, second-section high intensity magnetic separation tailing and first-section magnetic vibrating
concentrator tailing are combined into final tailing. According to the mixed ore
high pressure roll milling dual-media magnetic-
hematite ore grading process, fine breaking operation and two-section ore
grinding operation are reduced, the fine screening operation is eliminated, the flow structure is simplified, and dual-media and short-flow grading is achieved, and the mineral separation cost is reduced.