Novel grading prescreening precise separation method for mixed iron ore including magnetic iron ore, hematite and siderite

Abstract

The invention discloses a novel grading prescreening precise separation method for mixed iron ore including magnetic iron ore, hematite and siderite. Intermediate smashed products with the particle size being -50 mm are subjected to grading prescreening at first, prescreened rough concentrate, prescreened fine-particle iron ore concentrate and building material products with different particle grades are obtained; the prescreened rough concentrate is subjected to ore grinding and grading closed loop operation after being precisely smashed, low intensity magnetic separation concentration (C1),intermediate intensity magnetic separation concentration (C2), gravity concentrate (3) and reverse flotation iron ore concentrate (C4) are obtained, and a cement additive product is obtained. The novel grading prescreening precise separation method has the advantages that the adaptability is high, the energy saving effect is good, economic benefits are large, the separation precision and the resource comprehensive utilization rate are high, and the discharging amount of tailings is small, the method is especially suitable for screening of the mixed iron ore including the magnetic iron ore, thehematite and the siderite, wherein the TFe grade is 35.0%-42.0%, the hematite / limonite difficult to screen accounts for 19-25% of the total amount of the mixed iron ore, and the siderite accounts for17-23% of the total amount of the mixed iron ore.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a beneficiation method of magnetic-red-siderite mixed iron ore, which is particularly suitable for processing red (brown) iron ore whose TFe grade is between 35.0% and 42.0%. Separation of magnetic-red-siderite mixed iron ore with iron ore accounting for 19-25% of the total iron minerals and siderite accounting for 17-23% of the total iron minerals. Background technique [0002] As we all know, the energy consumption of ore grinding accounts for more than two-thirds of the total energy consumption of iron ore dressing plants. Therefore, "more crushing and less grinding" and "can throw away early" are the basic principles that should be considered first when determining the iron ore beneficiation process . At present, for single magnetite ore, with the popularization and application of high-pressure roller milling process and the progress of wet coarse ...

AI Technical Summary

Problems solved by technology

[0004] In short, the current pre-selection of hematite ore and mixed iron ore mainly has the following defects: (1) Large-block pre-selection using large-block jigs has large water consumption, unstable production indicators, high equipment failure rate, and poor production management. Problems such as difficult maintenance have been basically eliminated; (2) -5mm or -2mm particle size adopts wet drum type medium magnetic machine to lose tails, and the magnetic induction intensity of medium magnetic field magnetic separator is low, and the magnetic field gradient is low, resulting in high tailings grade The grade of tailings in a section of strong magnetic separation during the grinding operation indicates that the iron minerals that should not be discarded are lost in the tailings of medium magnetic separation, resulting in metal loss; Low

Disadvantages are: failure to obtain concentrate in advance, large amount of regrinding of coarse concentrate, among which siderite is brittle and prone to overgrinding, which is not conducive to energy saving and consumption reduction

The disadvantages are: the process route is long, the process is complicated, and there is a large cycle in the process, which makes the production operation difficult and the efficiency of the second-stage grinding is low

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