Process method for hematite dressing to increase gravity concentrate yield

Abstract

The invention relates to a process method for hematite dressing to increase gravity concentrate yield. The process method includes forming primary closed circuit grinding by an original and ball mill and a primary grading hydrocyclone, and feeding overflow of the primary grading hydrocyclone into a secondary grading hydrocyclone for grading. The process method is characterized by further including the following steps: feeding sunk sand of the secondary grading hydrocyclone into a roughing spiral chute and a concentration spiral chute, feeding rough tailings into a second-section weak magnetic machine and a sweeping machine, feeding concentrates of the concentration spiral chute into a high-frequency vibrating mesh screen, and feeding tailings together with concentrates of the second-section weak magnetic machine and the sweeping machine; feeding sunk sand of a tertiary grading hydrocyclone into a secondary ball mill, directly discarding tailings after overflow is screened by a third-section weak magnetic machine and a second-section strong magnetic machine, and feeding concentrates of a first-section weak magnetic machine and a first-section strong magnetic machine together with concentrates of the third-section weak magnetic machine and a second-section strong magnetic machine into a fourth grading hydrocyclone for grading. The process method has the advantages that gravity concentrate yield is increased, flotation processing quantity and flotation concentrate yield are substantially reduced, and dressing efficiency is improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of iron ore sorting, and in particular relates to a process for increasing the output of heavy-separation concentrate through hematite beneficiation. Background technique : [0003] At present, China's hematite beneficiation process mostly adopts stage grinding, coarse and fine separation, gravity separation-strong magnetic-anion reverse flotation process, and the iron concentrate produced by this process is composed of two parts: gravity concentration concentrate and flotation concentrate Composition, under normal production conditions, the grade of flotation concentrate is higher than that of gravity concentrate. In order to make the TFe grade of comprehensive iron concentrate reach more than 67.5%, the proportion of flotation concentrate and gravity concentrate is generally 5: 5 or 6:4, so the amount of ore treated by flotation is also greater than the amount of ore treated by gravity separat...

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Problems solved by technology

[0003]At present, China's hematite beneficiation process mostly adopts stage grinding, coarse and fine separation, gravity separation-strong magnetic-anion reverse flotation process, and the hematite produced by this process Iron concentrate is composed of two parts: gravity concentrate and flotation concentrate. Under normal production conditions, the grade of flotation concentrate is higher than that of gravity concentrate. The proportion of concentrated ore and gravity-selected concentrate is generally 5:5 or 6:4, so the amount of ore treated by flotation is also greater than the amount of ore treated by gravity-selection, because the gravity-selection cycle is large and the secondary grinding effect is not good. The coarse and fine graded hydrocyclones have a poor classification effect, and about 10% of the monomers in the overflow (flotation ore feeding) have not been resolved. After flotation, the TFe grade of the flotation concentrate is low and the TFe grade of the flotation tailings is high (about 20%), which is far higher than the TFe grade of the magnetic tailings (below 9%) and the strong magnetic tailings. Grade (below 9.5%), which affects the improvement of metal recovery rate

[0004] In order to increase the proportion of gravity concentration ore, reduce the proportion of flotation concentrate and reduce production costs, there are two main methods to solve the above problems at home and abroad. One is to cancel the fine-grained flotation process, use centrifugal concentrator to select fine-grained iron minerals, or other gravity separation processes, and obtain the final concentrate. The main disadvantage of this method is that the grade of comprehensive concentrate TFe is not high, and it cannot It meets the index requirements of iron raw materials for pellet production, and the grade of tailings is also high; the second is to re-select the mixed magnetic concentrate before flotation and increase the output of gravity-selected concentrate. The disadvantage of this method is that it cannot solve the heavy The problem of large amount of separation cycle can not solve the problem of further improving the dissociation degree of flotation feeding monomer

[0005]In order to improve the degree of dissociation of flotation monomers, strong magnetism is currently used to throw tails in advance, and the magnetic concentrate is finely ground and directly carried out reverse flotation. The disadvantage is that magnetic- The cost of flotation is higher

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