Mixed ore high-pressure roller grinding wet-type preselected, suspension roasting-magnetic separation process

Abstract

The invention relates to a mixed ore high-pressure roller grinding wet-type preselected, suspension roasting-magnetic separation process. The mixed ore high-pressure roller grinding wet-type preselected, suspension roasting-magnetic separation process comprises the following steps that after raw ore is rough broken and intermediate broken, a high-pressure roller grinded and screened product is fed for first-section weak magnetic wet-type preselection and first-section strong magnetic wet-type preselection, and part of tailings are thrown away; and a first-section weak magnetic wet-type preselected concentrate and a first-section strong magnetic wet-type preselected concentrate are fed for a primary grading system in a merged mode, a primary grading overflow product is fed for a first-section weak magnetic separator, the first-section weak magnetic concentrate is fed for a secondary grading system, secondary grading overflow is fed for a first-section dewatering tank, a second-section magnetic separator and a third-section magnetic separator to be selected, a first-section weak magnetic tailing is fed for a first-section strong magnetic separator and suspension roasting operation, and are selected through a fourth-section weak magnetic separator and a fifth-section weak magnetic separator, and a final concentrate is merged by an obtained roasting-magnetic separation concentrate and a third-section magnetic separator concentrate. The mixed ore high-pressure roller grinding wet-type preselected, suspension roasting-magnetic separation process has the advantages that after the wet-type preselection, tailings are thrown away in advance, the grinding amount of a ball mill is reduced, the magnetic ore and the hematite are respectively selected, the reverse flotation operation is canceled, and the process is simplified.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, and in particular relates to a high-pressure roller mill wet pre-selection, suspension roasting-magnetic separation process for mixed ore. Background technique [0002] Iron ore mixed ore is generally sorted by the process of "coarse crushing, medium crushing, fine crushing and screening, stage grinding, tower mill-weak magnetic field-strong magnetic field-reverse flotation". After the raw ore (300-0mm) undergoes coarse crushing, medium crushing and fine crushing and screening, the particle size reaches (12-0mm). The content of 200 mesh is 55-60%. After being separated by a weak magnetic separator, the weak magnetic tailings are sent to a strong magnetic separator for separation, and some coarse-grained qualified tailings are thrown away; a weak magnetic concentrate and a strong magnetic fine The ore forms a mixed magnetic concentrate and feeds it into the secondary closed-circuit grinding ...

AI Technical Summary

Problems solved by technology

[0003] The mixed ore adopts the process of "coarse crushing, medium crushing, fine crushing and screening, stage grinding, tower mill-weak magnetic field-strong magnetic field-reverse flotation". All products are given a stage of grinding operation. Pre-throwing some large-grain qualified tailings can greatly reduce the amount of ore fed to the first stage of grinding. In the existing process, all the mixed magnetic concentrates in the first stage are fed into the "tower mill-reverse flotation operation", and the magnetic ore does not necessarily need The tower mill achieves a particle size of -325 mesh above 90%, and the cost of the tower mill is relatively high, while the general ball mill can reach -200 mesh above 90%. A single magnetic separation method can obtain qualified grade magnetic concentrates, and all mixed magnetic concentrates are Feeding into the tower mill increases the number of tower mills, and the magnetic ore and hematite enter the reverse flotation operation together, which not only increases the amount of ore fed to the flotation operation, but also consumes a large amount of flotation equipment while increasing the flotation equipment. Choose medicine, increase cost

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