Mixed ore high pressure roll milling dual-media magnetic separation-hematite ore sorting process

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, and in particular relates to a mixed ore high-pressure roller mill, dual-media, magnetic-red ore separation process. Background technique [0002] The mixed ore is the ore mixed with magnetite and hematite. The iron ore mixed ore is generally separated by the process of "stage grinding, tower mill-weak magnetic field-strong magnetic field-reverse flotation". After the raw ore undergoes a closed-circuit grinding formed by one-stage grinding and one-stage grading, the primary grading overflow particle size reaches -200 mesh and the content is 55-60%. Sorting, throwing away part of the coarse-grained qualified tailings; a section of weak magnetic concentrate and a section of strong magnetic concentrate form a section of mixed magnetic concentrate, which is fed into the secondary closed-circuit grinding composed of a secondary classifying cyclone and a tower mill. The secondary grading overflow...

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Problems solved by technology

[0003] The mixed ore adopts the process of "stage grinding, tower mill-weak magnetic field-strong magnetic field-reverse flotation". Part of the concentrate is magnetic ore; after a section of weak magnetic tailings is sorted by a section of strong magnetic machine, a section of strong magnetic concentrate is obtained, and a section of strong magnetic concentrate is hematite. The mixed concentrate is fed into the tower mill to a particle size of -325 mesh above 90%, which will not only cause over-grinding of the magnetic ore, resulting in metal loss, but also increase the number of tower mills and increase the grinding cost. The amount of ore fed to the flotation operation is increased, and a large amount of flotation agents will be consumed while increasing the flotation equipment, which will increase the cost

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