Process for sorting iron-carbonate-containing low-grade iron ore concentrate

Abstract

The invention discloses a process for sorting iron-carbonate-containing low-grade iron ore concentrate. The process is characterized in that the iron-carbonate-containing low-grade iron ore concentrate is fed into a centrifugal machine for two sections of sorting work including roughing and scavenging and a section of grinding and grading work, so that grade of the iron ore concentrate is effectively increased and can reach above 67%, and the iron-carbonate-containing iron ore concentrate after sorting completely meets requirements of ironmaking production; the process adopting the centrifugal machine is free of environmental pollution and simple and easy to operate. The process has the advantages that the iron-carbonate-containing low-grade iron ore concentrate is fed into the centrifugal machine for the two sections of sorting work including roughing and scavenging and a section of grinding and grading work, so that the grade of the iron ore concentrate is effectively increased and can reach above 67%, a sorting index that metal recovery rate is 70% is realized, the iron-carbonate-containing iron ore concentrate after sorting completely meets the requirements of ironmaking production; the process adopting the centrifugal machine is free of environmental pollution and simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of beneficiation, and in particular relates to a process for separating low-grade iron ore concentrates containing iron carbonate. Background technique [0002] There are only some new technologies for the separation of iron carbonate containing iron ore in the published literature in China. There are the following: [0003] 1. Chinese Patent No. 201210198534.1 discloses a "new process for sorting iron carbonate-containing lean magnetite ore" and it is characterized in that: first adopt "stage grinding, strong magnetic tail throwing technology, enrich tail throwing, and obtain mixed magnetic separation concentrate; Using "one-stage roughing, one-stage selection and two-stage scavenging open-circuit reverse flotation process" to separate the mixed magnetic separation concentrate to obtain high-grade maghemite concentrate, which is enriched in the "open-circuit reverse flotation process" The high iron carbon...

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Problems solved by technology

[0015] Third, for the produced low-grade iron concentrate containing iron carbonate, it is not effective to use flotation process to improve the grade of iron concentrate, because iron concentrate contains iron carbonate, and iron carbonate will be adsorbed on iron minerals and veins A cover is formed on the surface of rock minerals, thereby changing the physical and chemical properties of the mineral surface, making the adsorption of flotation reagents lose selectivity, resulting in indiscriminate semen and tail.

[0016] Fourth, the produced low-grade iron concentrate containing iron carbonate has a fineness of -200 mesh and a content of more than 80%. , it is difficult to increase the concentrate grade

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