Mineral separation process for magnetic hematite rough concentrates

Abstract

The invention relates to a mineral separation process for magnetic hematite rough concentrates, which comprises the following steps of: feeding the magnetic hematite rough concentrates into a closed circuit grinding system; once grading, overflowing and feeding into weak magnetism at first section; feeding the concentrates in the weak magnetism at the first section into a dewatering tank; feedingthe concentrates in the dewatering tank into a fine sieve; returning rough particle products on the sieve into the first section for grinding; feeding fine particle products under the sieve into weakmagnetism at second section; mixing tailings in the weak magnetism at the second section, tailings in the weak magnetism at the first section and tailings in the dewatering tank to obtain low intensity magnetic separation tailings; concentrating the low intensity magnetic separation tailings by a concentrating machine; feeding into a closed circuit regrinding system; grading, overflowing and feeding again into strong magnetism; concentrating strong magnetic concentrates by the concentrating machine; feeding into a negative ion reverse flotation process including one-time rough separation, one-time fine separation and three-time scavenging; combining the strong magnetic tailings with the floatation tailings to obtain final tailings; and combining the concentrates in the weak magnetism at the second section with the flotation concentrates to obtain final concentrates. The mineral separation process provided by the invention is simple, high-efficiency, particularly low-cost, good in effect and high in concentrate quality and metal recovery rate, and realizes high-efficiency utilization of resources.

Description

technical field [0001] The invention relates to the technical field of mine beneficiation, in particular to a mixed-type coarse-concentrate ore beneficiation process. Background technique [0002] The problem in the processing and utilization of lean iron ore is that it is easy to obtain medium-grade (such as 52-57%) ore (coarse concentrate) by ordinary beneficiation methods, but it must continue to be selected to obtain higher grades (such as 62% or more) concentrate products are often technically difficult, or cost more sorting costs. This is also a common problem in the beneficiation and processing of lean iron ore. How to use a simple and economical separation method to achieve the purpose of increasing iron and reducing silicon is the basic principle of rational use of ore resources and determination of beneficiation process. [0003] Magnetic and red mixed iron ore refers to the ore whose MFe / TFe is between 15-85%. According to the production experience of mines i...

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Problems solved by technology

[0002] The problem in the processing and utilization of lean iron ore is that it is easy to obtain medium-grade (such as 52-57%) ore (coarse concentrate) by ordinary beneficiation methods, but it must continue to be selected to obtain higher grades (such as 62% or more) concentrate products are often technically difficult, or cost more sorting costs

[0004] 1. Stage grinding, coarse and fine separation, medium ore regrinding, coarse grain gravity separation, fine grain magnetic separation-fine screen process, this process adopts stage grinding, coarse and fine separation, and coarse grain is re-separated by two-stage spiral launder For heavy tailings, use medium magnetic sweeping and throwing tailings, heavy-grained ore re-grinding, fine-grained magnetic separation and fine-grained magnetic separation, coarse-grained gravity-separated concentrates and fine-grained magnetic-separated concentrates are separated by fine screening to improve the quality of iron and reduce Silicon, the disadvantage is that the recovery rate of fine-grained hematite is not high, and it is easy to cause the loss of heavy metals

[0005] 2. Stage grinding, stage strong magnetic-gravity separation process. This process adopts grinding, one stage strong magnetic separation, two stage grinding, two stage strong magnetic separation, and spiral chute gravity separation of the second stage strong magnetic separation concentrate. Heavy concentrate, medium ore and tailings, medium ore and tailings are subjected to shaker gravity separation, heavy concentrate and shaken concentrate are combined to form concentrate, the disadvantage is that the strong magnetic separation has a large processing capacity and high equipment investment. In addition, Direct strong magnetic separation of mixed iron ore is likely to cause blockage of the equipment medium and affect the smooth flow of the process

[0006] 3. Continuous grinding, weak magnetic, strong magnetic - anion reverse flotation process, this process first passes through two stages of continuous grinding, so that the grinding particle size reaches monomer dissociation, and the energy consumption of grinding is high, which will cause iron minerals Over-grinding, tailings grade is high, process metal loss is heavy, metal recovery rate is not high

[0007] 4. Stage grinding, weak magnetic, strong magnetic-centrifuge gravity separation process, the process is through grinding, weak magnetic separation, strong magnetic sweeping, mixed magnetic concentrate regrinding, second stage weak magnetic separation, second stage strong Magnetic sweeping, the second-stage mixed magnetic concentrate is re-selected by centrifuge to obtain the final concentrate. Compared with process 2, the structure of this process is relatively reasonable, but in these two processes, strong magnetic tailing is thrown, especially under the condition of rough grinding The effect of strong magnetic tailing is not obvious, so the amount of regrinding is large, the amount of ore in sorting operation is large, the energy consumption of grinding is high, and the cost is high

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