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Ore grinding weak-magnetic strong-magnetic gravity separation reverse flotation process for magnetic hematite ore

An iron ore and reverse flotation technology, applied in flotation, magnetic separation, solid separation, etc., can solve the problems of low separation efficiency and complex process flow, and achieve the effect of shortening the beneficiation process, simple operation and low investment.

Inactive Publication Date: 2021-04-02
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the existing technical problems of processing maghemite ore such as complicated process flow and low sorting efficiency, the object of the present invention is to provide a kind of grinding-magnetic-weakening process for maghemite ore with simplified process flow and improved sorting efficiency. Strong magnetic-gravity-reverse flotation process

Method used

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  • Ore grinding weak-magnetic strong-magnetic gravity separation reverse flotation process for magnetic hematite ore
  • Ore grinding weak-magnetic strong-magnetic gravity separation reverse flotation process for magnetic hematite ore

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The maghemite ore with an iron grade of 29.25% and a magnetite distribution rate of 79.02% was selected as the raw material. Grinding-weak magnetic field-strong magnetic field-gravity separation-reverse flotation process sorting, according to the following steps

[0035] Step 1. One-stage closed-circuit grinding and grading

[0036] After the primary maghemite ore is crushed, it is sent to a section of closed-circuit grinding and grading operation, and the fineness of the first-stage grading overflow product is controlled to be kept at -200 mesh, accounting for 70%;

[0037] Step 2, weak magnetic separation

[0038] A section of graded overflow product was fed into a weak magnetic separator with a magnetic induction intensity of 0.1 T for wet weak magnetic separation. Under the conditions of a pulp concentration of 33.33% and an ore feeding speed of 100 mL / s, weak magnetic concentrate and weak magnetic magnetic tailings;

[0039] Step 3, strong magnetic separation

...

Embodiment 2

[0053] Method is with embodiment 1, and difference is:

[0054] (1) Select maghemite ore with iron grade of 31.29% and magnetite distribution rate of 75.52% as raw material;

[0055] (2) The pulp concentration of wet weak magnetic separation is 35%, and the ore feeding speed is 120 mL / s;

[0056] (3) In the strong magnetic separation process, the background magnetic induction of the wet vertical ring strong magnetic machine is 0.7 T;

[0057] (4) When the coarse-grained products of the mixed magnetic concentrate are fed into the spiral chute of gravity separation after being coarsely and subdivided by the hydrocyclone, the feeding concentration is 12%;

[0058] (5) When the re-selected tailings are fed into the second-stage mill for grinding, the fineness of the second-stage grinding product is controlled, and it is ground to -200 mesh content accounting for 85%.

[0059] By adopting the technological process of the present invention, the final concentrate product obtained b...

Embodiment 3

[0061]Method is with embodiment 1, and difference is:

[0062] (1) Select maghemite ore with iron grade of 38.68% and magnetite distribution rate of 76.08% as raw material;

[0063] (2) The pulp concentration of wet weak magnetic separation is 37%, and the ore feeding speed is 180 mL / s;

[0064] (3) In the strong magnetic separation process, the background magnetic induction of the wet vertical ring strong magnetic machine is 0.8 T;

[0065] (4) When the coarse-grained products of the mixed magnetic concentrate are fed into the spiral chute of re-selection after being coarsely and subdivided by the hydrocyclone, the feeding concentration is 13%;

[0066] (5) When the re-selected tailings are fed into the second-stage mill for grinding, the fineness of the second-stage grinding product is controlled, and it is ground to -200 mesh content accounting for 88%.

[0067] By adopting the technological process of the present invention, the final concentrate product obtained by benef...

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Abstract

The invention relates to an ore grinding weak-magnetic strong-magnetic gravity separation reverse flotation process for a magnetic hematite ore. The ore grinding weak-magnetic strong-magnetic gravityseparation reverse flotation process for the magnetic hematite ore is characterized by comprising the following steps that the magnetic hematite ore with the grade of 25%-45% and the magnetite distribution rate of more than or equal to 60% is subjected to grinding and weak and strong magnet separation tailing discarding, coarse-fine classification is carried out on weak and strong magnetic concentrate, coarse-fine spiral chute gravity separation is carried out on a coarse fraction to obtain gravity concentrate, and tailings in gravity separation are re-ground and then returned to the weak andstrong magnetic separation; reverse flotation of rough flotation-fine flotation-three scavenging is carried out on the fine fraction to obtain floating concentrate, and floating tailings are discarded; and the gravity concentrate and the floating concentrate are combined to form the final concentrate with the iron grade larger than or equal to 65% and the total recovery rate larger than or equal to 80%. The ore grinding weak-magnetic strong-magnetic gravity separation reverse flotation process for the magnetic hematite ore has the advantages that (1), the method is suitable for all iron ores with high magnetic iron content, and fine-grained embedded iron ores are included; (2), the existing process is remarkably shortened, the concentrate grade is high, and the recovery rate is high; and (3), the ore treatment amount of the magnetic gravity separation process is a main body part, equipment operation is stable, operation and control are simple, meanwhile, the flotation pressure is reduced, investment is low, energy is saved, and environment friendliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a process of grinding-weak and strong magnetism-gravity separation-reverse flotation of maghemite ore. Background technique [0002] The useful minerals contained in magnetic hematite mixed iron ore are mainly magnetite, false hematite and hematite. At present, the main sorting process for processing Anshan-style maghemite ore is the process of "stage grinding, coarse and fine separation, gravity separation-strong magnetic field-anion reverse flotation", see figure 1 . In production practice, the outstanding shortcomings of this sorting process are as follows: 1) The concentrate grade of the gravity separation process is low and fluctuates greatly. Floating tail loss, the final concentrate grade and recovery rate are not satisfactory; 2) The sorting process is long and complicated, and it is difficult to maintain a balance between each process, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/00B03C1/02B03B5/62B03D1/00
CPCB03B9/00B03C1/02B03B5/626B03D1/00
Inventor 徐冬林刘杰韦文杰盖壮亢旭高鹏张玲
Owner ANSTEEL GRP MINING CO LTD
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