Magnetism-gravity combined separation technology for magnetic hematite mixed type rough concentrate

Abstract

The invention relates to a magnetism-gravity combined separation technology for magnetic hematite mixed type rough concentration. The technology is characterized by comprising the following steps of: feeding the magnetic hematite mixed type rough concentration into a closed-circuit grinding system; feeding first-section weak magnetism through primary classification overflow; feeding the concentrate of the first-section weak magnetism into a dehydration tank; feeding the concentrate of the dehydration tank into a fine sieve; returning the coarse-grain product on the sieve to the grinding system; feeding the fine-grain product below the sieve to second-section weak magnetism; mixing the tailings of the second-section weak magnetism with the tailings of the first-section weak magnetism and the tailings of the dehydration tank to obtain weak-magnetic separation tailings; concentrating the weak-magnetic separation tailings by a concentrator, and feeding into a first-section centrifugal machine for roughing; feeding the concentrate of the first-section centrifugal machine into a second-section centrifugal machine for selection; discarding the tailings of the first-section centrifugal machine; mixing the concentrate of the second-section centrifugal machine with the second-section weak-magnetism concentrate to obtain the final concentrate; and returning the tailings of the second-section centrifugal machine to the concentrator. The technology provided by the invention is simple and efficient, has low separation cost, a good effect and high concentrate grade and metal recovery rate, and realizes efficient utilization of resources.

Description

technical field [0001] The invention relates to the technical field of mine beneficiation, in particular to a magnetic-red mixed type rough concentrate magnetic-gravity combined separation 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 52-58%) ore (coarse concentrate) by ordinary beneficiation methods, but it must continue to be selected to obtain higher grade (such as 62% or more) concentrate products are often technically difficult, or cost more sorting costs. This is also a common problem in the process of beneficiation and processing of lean iron ore. How to adopt a simple and economical separation method to achieve the purpose of quality improvement is the basic principle for the rational use of ore resources and the determination of the beneficiation process. [0003] Magnetic and red mixed iron ore refers to the ore whose MFe / TFe is between 15-85%. According ...

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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 52-58%) ore (coarse concentrate) by ordinary beneficiation methods, but it must continue to be selected to obtain higher grade (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 the heavy tail, use medium magnetic sweeping to remove tailings, re-grind the ore, and fine-grained magnetic separation to remove the tailings. 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 coarse concentrate 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, high tailings grade, heavy process metal loss, and low metal recovery rate;

[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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