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Separation method for strengthening recycling of fine-grain low-intensity-magnetic iron ore through magnetic levitation stage agent addition

A technology for iron minerals and weak magnetic separation, applied in chemical instruments and methods, flotation, solid separation, etc., can solve the problems of difficult recovery of fine-grained weak magnetic iron minerals, achieve good comprehensive utilization effect and low comprehensive cost , the effect of low environmental pollution

Inactive Publication Date: 2017-06-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above-mentioned problem of difficult recovery of fine-grained weakly magnetic iron minerals, the present invention provides a sorting method for magnetic levitation segmental dosing combined with enhanced recovery of fine-grained weakly magnetic iron minerals, that is, adding relative molecular weight Moderate organic polymer agent with selective flocculation and selective inhibition on iron minerals, which promotes loose iron mineral particles to become iron mineral particle flocculation in advance, thereby effectively increasing the recovery probability of fine-grained iron minerals In addition, this kind of high-selectivity flocculant of hematite can be added to the strong magnetic concentrate to continue reverse flotation, and can also act as an effective inhibitor of iron minerals in reverse flotation, not only does not cause adverse effects on flotation, but also It will reduce the amount of newly added inhibitors in subsequent reverse flotation operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) It is 25% to take the concentration, the particle size is -0.074mm, and the ore slurry containing 95% of weakly magnetic iron minerals is carried out under the condition that the magnetic field strength is 800 Oersted, and a weak magnetic separation is carried out to obtain an iron grade of 64.30 % of weak magnetic separation magnetic products.

[0032] (2) Concentrate the tailings of the weak magnetic separation to a pulp concentration of 25%. Under the condition of a stirring speed of 1100r / min, add the pulp pH regulator sodium carbonate and stir at a constant speed for 5min, and the pH of the pulp is 10.5; Carboxymethyl starch, an iron mineral inhibitor with selective flocculation, is added to the agitated pulp as the first stage of dosing in stages. At this time, the stirring speed of the pulp is kept at 800r / min, so that the fine-grained iron minerals Under the action of medicaments, moderately sized weakly magnetic iron mineral selective flocs are formed.

[...

Embodiment 2

[0037] (1) Take a concentration of 27%, a particle size of -0.074mm, and a slurry containing 96% of weakly magnetic iron minerals. Under the condition that the magnetic field strength is 900 Oersted, carry out a weak magnetic separation to obtain an iron grade of 63.50 % of weak magnetic separation magnetic products.

[0038] (2) Concentrating the tailings of the weak magnetic separation to a pulp concentration of 27%, under the condition of a stirring speed of 1000r / min, adding the pulp pH regulator sodium carbonate and stirring at a constant speed for 4min, the pH of the pulp is 10.2; then the iron ore Carboxymethyl starch, an iron mineral inhibitor with selective flocculation, is added to the agitated pulp as the first stage of dosing in stages. At this time, the stirring speed of the pulp is kept at 750r / min to make the fine-grained iron minerals Under the action of medicaments, moderately sized flocs are formed.

[0039] (3) the concentration value that will form weak ma...

Embodiment 3

[0043] (1) Take a concentration of 30%, a particle size of -0.074mm, and a slurry containing 98% of weakly magnetic iron minerals. Under the condition that the magnetic field strength is 1000 Oersted, carry out a weak magnetic separation to obtain an iron grade of 63.10 % of weak magnetic separation magnetic products.

[0044] (2) Concentrate the tailings of the weak magnetic separation to a pulp concentration of 30%. Under the condition of a stirring speed of 1200r / min, add the pulp pH regulator sodium carbonate and stir at a constant speed for 5min, and the pH of the pulp is 10.5; Carboxymethyl starch, an iron mineral inhibitor with selective flocculation, is added to the agitated pulp as the first stage of dosing in stages. At this time, the stirring speed of the pulp is kept at 900r / min, so that the fine iron minerals in the pulp Under the action of medicaments, moderately sized flocs are formed.

[0045] (3) The concentration value of the pulp that forms the selective fl...

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Abstract

The invention relates to a separation method for strengthening recycling of fine-grain low-intensity-magnetic iron ore through combination of magnetic levitation stage agent addition in the field of ore machining. The separation method includes the steps that firstly, ore pulp containing the fine-grain low-intensity-magnetic iron ore is subjected to low-intensity-magnetic separation work; secondly, after slurry mixing of low-intensity-magnetic separation tailings is conducted, a pH modifier is added, and an organic inhibitor serves as a first-stage agent to be added into the ore pulp; thirdly, one time of high-intensity-magnetic separation is conducted on the ore pulp; fourthly, a pH modifier is added into a mixed magnetic product of low-intensity-magnetic separation and high-intensity magnetic separation, a second-stage agent, a quartz activating agent and a negative ion reverse flotation collecting agent are added into the ore pulp, and reverse flotation feed ore is obtained; and fifthly, the reverse flotation feed ore is subjected to one time of roughing and one time of concentrating, final concentrates are obtained, reverse flotation rougher tailings are subjected to two times or three times of scavenging, and final reverse flotation scavenged tailings are obtained.

Description

technical field [0001] The invention belongs to the field of mineral processing, and in particular relates to a sorting method for maglev segmental dosing combined with enhanced recovery of fine-grained weakly magnetic iron minerals. Background technique [0002] With the continuous acceleration of the development and utilization of mineral resources in my country, iron ore resources with coarse crystal grain size and simple symbiosis relationship are decreasing day by day. For iron ore with fine crystal grain size, various types of minerals and complex coexistence relationship, in order to obtain a better separation effect, the iron ore must be finely ground to fully dissociate the monomer, so that the fine-grained weakly magnetic iron ore Recycling is becoming more and more difficult. At present, many domestic processing plants have adopted coarse and fine separation, gravity separation-magnetic separation-anion reverse flotation process to carry out industrial production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03D1/002B03D1/016B03D103/02B03D101/06B03D101/02
CPCB03B7/00B03D1/002B03D1/016B03D2201/002B03D2201/005B03D2201/007B03D2201/02B03D2201/06B03D2203/02
Inventor 李文博韩跃新李艳军朱一民
Owner NORTHEASTERN UNIV
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