CN-121988447-A - Ore dressing process for improving recovery rate of magnetic iron in tailings with wide size fraction

CN121988447ACN 121988447 ACN121988447 ACN 121988447ACN-121988447-A

Abstract

The invention discloses a mineral separation process for improving the recovery rate of magnetic iron in tailings with wide size fractions, and belongs to the technical field of mineral separation. The invention can effectively reduce the grade of the magnetic iron in the tailings, improve the recovery rate of the magnetic iron, and solve the problems of resource waste caused by low concentration of the iron tailings and wide particle size distribution range in the prior art. According to the invention, fine tailings after wet preselection and grading and fine tailings produced by stage grinding sorting and elutriation are subjected to magnetic separation operation, the advantages of good coarse particle recovery effect, high magnetic field intensity, large gradient and good fine particle recovery effect of the disc type magnetic separator are utilized, and two stages of serial magnetic separation are utilized to balance recovery of coarse and fine magnetic iron particles contained in tailings, so that the technical effect of improving the recovery rate of the magnetic iron of the tailings in wide size fraction is achieved, the comprehensive utilization of resources and the effect of compliance and yield increase are realized, meanwhile, the whole improvement does not cause waste of the existing equipment, the improvement cost is relatively low, and the method is suitable for large-scale production.

Inventors

CHANG LUPING
WU HONG
WANG HUAN
WANG RONGLIN
YANG SONGFU
CHEN XIN
HUANG AN

Assignees

安徽马钢矿业资源集团姑山矿业有限公司白象山矿业分公司

Dates

Publication Date: 20260508
Application Date: 20260304

Claims (8)

1. A mineral separation process for improving the recovery rate of magnetic iron in tailings with wide size fraction is characterized by comprising the following specific operations: s1, collecting ores; S2, carrying out wet preselection tailing discarding operation on the ore obtained in the step S1, wherein the material with the specification of concentrate is subjected to the step S3, and the material with the specification of tailings is subjected to the step S4; S3, carrying out stage grinding sorting and elutriation and concentration operation on the concentrate obtained in the step S2, filtering materials with the specification of concentrate, directly selling the materials, and carrying out step S5 on the materials with the specification of tailings; S4, performing classification operation of a spiral classifier on the tailings obtained in the step S2, selling coarse tailings serving as building materials, mixing the fine tailings with the tailings in the step S3, and performing a step S5; s5, carrying out magnetic separation operation of a disc magnetic separator on the mixed tailings obtained in the steps S3 and S4, wherein the material with the specification of concentrate is subjected to step S7, and the material with the specification of tailings is subjected to step S6; S6, carrying out magnetic separation operation on the tailings obtained in the step S5 by using a cage magnetic separator, wherein the material with the specification of concentrate is subjected to the step S7, and the material with the specification of tailings is used as final tailings for filling or ecological reclamation; S7, mixing the concentrates obtained in S5 and S6, and then re-feeding the concentrate into the stage grinding separation and elutriation and concentration operation.
2. The beneficiation process for improving the magnetic iron recovery rate of the tailings with wide size fraction according to claim 1, wherein in the step S3, the stage grinding separation and elutriation concentration operation comprises primary screening, primary grinding, primary grading, primary magnetic separation, secondary grading, secondary grinding, secondary magnetic separation, high-frequency fine screening, elutriation and concentrated magnetic separation.
3. The beneficiation process for improving the magnetic iron recovery rate of the tailings with the wide size fraction according to claim 2, wherein the concentrate obtained in the step S2 is subjected to primary screening and is divided into two size fractions of +0.5mm and-0.5mm, and a product of +0.5mm enters a first stage of ore grinding, and the first stage of ore grinding is followed by a first stage of classification.
4. A beneficiation process for improving the magnetic iron recovery rate of the tailings with wide size fractions according to claim 3, wherein the step of classifying the sand is returned to the step of grinding, and the step of classifying overflow is mixed with a product with the diameter of-0.5 mm and then subjected to the step of magnetic separation.
5. The beneficiation process for improving the magnetic iron recovery rate of the tailings with the wide size fraction according to claim 4, wherein the concentrate obtained by the first-stage magnetic separation enters a second-stage classification, and the tailings obtained by the first-stage magnetic separation are subjected to step S5.
6. The beneficiation process for improving the magnetic iron recovery rate of the tailings with the wide size fraction according to claim 5, wherein the overflow of the second stage classification is subjected to the second stage magnetic separation, the settled sand of the second stage classification is subjected to the second stage grinding, and the settled sand returns to the second stage classification after the second stage grinding treatment.
7. The beneficiation process for improving the magnetic iron recovery rate of the tailings with the wide size fraction according to claim 6, wherein the magnetic concentrate with the second-stage magnetic separation enters a high-frequency fine screen, and tailings obtained by the second-stage magnetic separation are subjected to step S5.
8. The beneficiation process for improving the magnetic iron recovery rate of the tailings with wide size fraction according to claim 7, wherein the high-frequency fine screen screens the two-stage magnetic concentrate and is divided into two size fractions of +0.076mm and-0.076 mm; The ore concentrate after elutriation is filtered and then is directly sold, and the tailings after elutriation are concentrated and magnetically separated; concentrating and magnetically separating with +0.076mm particle size; And (5) returning the concentrated and magnetically separated concentrate to the second-stage grinding, and carrying out step S5 on the concentrated and magnetically separated tailings.

Description

Ore dressing process for improving recovery rate of magnetic iron in tailings with wide size fraction Technical Field The invention relates to the technical field of mineral separation, in particular to a mineral separation process for improving the recovery rate of magnetic iron in tailings with wide grain size. Background The magnetic ore tailings are always lost in mineral resources and traditional energy industries, so that not only is the serious waste of resources caused, but also the serious environmental pollution is caused. The magnetic ore tailings have the characteristics of low mass concentration, large pulp volume, wide particle size distribution and the like, the recyclable iron-containing minerals are basically coarse-particle lean continuous organisms and micro-particle monomer iron minerals, the magnetic force is weak, and the selection of proper tailings recycling equipment is the key for recycling the magnetic iron minerals in the tailings to the maximum extent. In the prior art, a conventional permanent magnet drum type magnetic separator is generally used for tailing recleaning or tailing recycling, but the pulp treatment capacity of the type of magnetic separator is very low, the recycling rate is low, the occupied area in the process arrangement is too large, and a plurality of inconveniences are brought to the process design of a concentrating mill. Aiming at urgency and difficulty of tailing recovery, a disc type tailing recovery magnetic separation technology and equipment are developed, and the disc type magnetic separator has the advantages of large separation space and high recovery rate, is low in manufacturing cost, and is particularly suitable for tailing recovery operation. However, when tailings with low concentration and wide particle size distribution range are treated, the magnetic field gradient of the disc magnetic separator is low, the magnetic force acting range is narrow, the magnetic attraction force of the micro-fine magnetite is smaller than the acting force of water flow, and the micro-fine magnetite is more easily taken away by the water flow, so that resource waste is caused. Disclosure of Invention 1. Technical problem to be solved by the invention Aiming at the defects and shortcomings of the prior art, the invention provides a mineral separation process for improving the recovery rate of magnetic iron of tailings with wide size fraction, which can effectively reduce the grade of the magnetic iron of the tailings and improve the recovery rate of the magnetic iron, and solves the problems of resource waste caused by low concentration of the iron tailings, wide particle size distribution range and difficult recovery in the prior art. 2. Technical proposal In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the invention relates to a mineral separation process for improving the recovery rate of magnetic iron in tailings with wide grain size, which comprises the following specific operations: s1, collecting ores; S2, carrying out wet preselection tailing discarding operation on the ore obtained in the step S1, wherein the material with the specification of concentrate is subjected to the step S3, and the material with the specification of tailings is subjected to the step S4; S3, carrying out stage grinding sorting and elutriation and concentration operation on the concentrate obtained in the step S2, filtering materials with the specification of concentrate, directly selling the materials, and carrying out step S5 on the materials with the specification of tailings; S4, performing classification operation of a spiral classifier on the tailings obtained in the step S2, selling coarse tailings serving as building materials, mixing the fine tailings with the tailings in the step S3, and performing a step S5; s5, carrying out magnetic separation operation of a disc magnetic separator on the mixed tailings obtained in the steps S3 and S4, wherein the material with the specification of concentrate is subjected to step S7, and the material with the specification of tailings is subjected to step S6; S6, carrying out magnetic separation operation on the tailings obtained in the step S5 by using a cage magnetic separator, wherein the material with the specification of concentrate is subjected to the step S7, and the material with the specification of tailings is used as final tailings for filling or ecological reclamation; S7, mixing the concentrates obtained in S5 and S6, and then re-feeding the concentrate into the stage grinding separation and elutriation and concentration operation. Further, in the step S3, the stage grinding separation and elutriation selection operations include primary screening, primary grinding, primary grading, primary magnetic separation, secondary grading, secondary grinding, secondary magnetic separation, high-frequency fine screening, elutriation and concentration magnetic separation. Further