Recleaning process for section of strong magnetic tailings in mixed lean iron ores

A technology of lean iron ore and mixed type is applied in the field of high-magnetic tailings re-selection process of the first stage of mixed lean iron ore, which can solve the problems of difficulty in reducing the grade and the inability to effectively improve the resource utilization rate, etc., and achieves high production efficiency and improved Resource utilization rate and enterprise economic benefit, effect of low tailings grade

Active Publication Date: 2013-02-06
YUXI DAHONGSHAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the processes use a high-strength magnetic separation to achieve a large number of tailings to increase productivity and reduce subsequent process costs, making it difficult to reduce the grade of high-strength magnetic tailings to below 10%, which cannot effectively improve resource utilization.

Method used

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  • Recleaning process for section of strong magnetic tailings in mixed lean iron ores

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add water to grind the tailings with a grade of 23% after strong magnetic separation in the Dahongshan Concentrator of Kunming Iron and Steel Co., Ltd. to a fineness of -0.045mm, accounting for 95% by weight of the regrind pulp, and control the concentration of the pulp to 65%; The grinding pulp is deslimed by adding water to the separation box to obtain bottom ore and overflow tailings with a pulp concentration of 35%, and the bottom ore is sent to a superconducting magnetic separator with a magnetic field strength of 20,000 Oersted to obtain strong magnetic concentrate and magnetic separation tailings ; The magnetic separation tailings are sorted through a vibrating spiral chute to obtain a snail concentrate and a snail tailing with a concentration of 25%; Concentrate and shaking tailings. The shaker sorting is carried out in stages, and a single rough selection is performed once.

Embodiment 2

[0028] Add water to grind the tailings with a grade of 23% after strong magnetic separation in the Dahongshan Concentrator of Kunming Iron and Steel Co., Ltd. to a fineness of -0.045mm, accounting for 95% by weight of the regrind pulp, and control the concentration of the pulp to 65%; The grinding pulp is deslimed by adding water to the separation box to obtain bottom ore and overflow tailings with a pulp concentration of 35%, and the bottom ore is sent to a superconducting strong magnetic machine with a magnetic field strength of 20,000 Oersted to obtain strong magnetic concentrate and magnetic separation tailings ; The magnetic separation tailings are sorted through a vibrating spiral chute to obtain a snail concentrate and a snail tailing with a concentration of 25%; Concentrate and shaking tailings. The shaking table sorting is not carried out in different grades, one time for rough selection and two times for fine selection.

Embodiment 3

[0030] Add water to grind the tailings with a grade of 20% after strong magnetic separation in the Dahongshan Concentrator of Kunming Iron and Steel Co., Ltd. to a fineness of -0.045mm and account for 80% by weight of the regrind pulp, and control the concentration of the pulp to 70%; Weak magnetic concentrate and weak magnetic tailings are obtained by grinding slurry through weak magnetic separation with a magnetic field strength of 1000 Oersted; the weak magnetic tailings are deslimed through the ore separation box to obtain bottom ore and overflow tailings with a pulp concentration of 30% , the bottom ore is sent into the Jones wet strong magnetic field magnetic separator with a magnetic field strength of 7000 Oersted to obtain rough concentrate and magnetic separation tailings, and the rough concentrate is a high gradient magnetic separator with a magnetic field strength of 15000 Oersted Concentrate to obtain strong magnetic concentrate and magnetic separation tailings; sep...

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Abstract

The invention discloses a recleaning process for a section of strong magnetic tailings in mixed lean iron ores, comprising the following steps of: tailing regrinding: adding water into a section of tailings subjected to strong magnetic separation, grinding the tailings into regrinding ore pulp with mineral aggregate proportion of 60-95% and fineness of -0.045mm, and controlling the concentration of the ore pulp at 65-75%; strong magnetic separation: adding water into the regrinding ore pulp and desliming in an ore separation box to obtain bottom ores with the ore pulp concentration of 25-35% and overflow tailings, and feeding the bottom ores into a strong magnetic separator with the magnetic field strength of 5000-20000 oersteds to obtain strong magnetic concentrates and magnetic separation tailings; spiral chute separation: screening the magnetic separation tailings through a spiral chute to obtain spiral chute concentrates with the concentration of 15-25% and spiral chute tailings; and table separation: separating the spiral chute concentrates by a table with the stroke of 8-10mm and the stroke times of 250-300 times/min to obtain table concentrates and table tailings. A regrinding, magnetic separation and recleaning process is adopted for respectively recovering large-grain and fine-grain recovering magnetic iron ores and weakly magnetic iron ores in the section of strong magnetic tailings, and therefore, the recovery rate and the concentrate grade are high. The process provided by the invention is simple and convenient, high in production efficiency, low in production cost, high in concentrate grade and recovery rate and low in tailing grade lower than 10%.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal beneficiation, and in particular relates to a beneficiation process of fine-grain embedded mixed lean iron ore, in particular to a re-election process of mixed lean iron ore one-stage strong magnetic tailings. Background technique [0002] At present, the beneficiation process of iron ore mainly includes gravity separation, flotation and strong magnetic separation or a combination of multiple beneficiation processes, and there is also a process of weak magnetic separation after magnetization roasting. Due to the characteristics of "poor, fine, and miscellaneous" iron ore resources in my country, with the depletion of high-grade iron ore resources, more and more low-grade, fine-grained, weakly magnetic hematite and magnet-hematite are involved. The beneficiation operation of mixed ore. For this kind of mineral materials, the gravity separation process is generally adopted in the early stage, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B9/06
CPCY02W30/52
Inventor 刘仁刚蔡正鹏唐国栋刘洋邓琴
Owner YUXI DAHONGSHAN MINING
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