CN-121988446-A - Ore dressing process for improving magnetic iron recovery rate through graded magnetic separation of tailings with wide size fraction

CN121988446ACN 121988446 ACN121988446 ACN 121988446ACN-121988446-A

Abstract

The invention discloses a mineral separation process for improving the recovery rate of magnetic iron by grading and magnetic separation of tailings with wide size fractions, and belongs to the technical field of mineral separation. According to the invention, the fine tailings after wet pre-separation and classification and the fine tailings generated by stage grinding and elutriation and classification are subjected to pre-classification operation, the advantages of good coarse particle recovery effect and good fine particle recovery effect of the disc type magnetic separator are utilized to respectively carry out magnetic separation on the underflow and overflow generated by classification, and coarse and fine particles containing magnetic iron in the tailings are uniformly recovered, so that the technical effect of improving the recovery rate of the magnetic iron of the tailings in wide size range is achieved, the comprehensive utilization of resource recovery and the effect of compliance and yield increase are realized, meanwhile, the whole improvement does not cause the abandonment of the existing equipment, the tailings are pre-split, the equipment consumption and initial investment can be effectively reduced, the system processing capacity is improved, the improvement cost is relatively low, and the method is suitable for large-scale production.

Inventors

CHANG LUPING
MIAO TAO
WU HONG
WANG RONGLIN
LI MINGJUN
FENG JIAN
Zheng Siran
WANG TAO

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 by grading and magnetic separation of 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, grading the mixed tailings obtained in the steps S3 and S4, wherein the material with the specification of overflow is subjected to the step S6, and the material with the specification of underflow is subjected to the step S7; S6, carrying out magnetic separation operation of a cage magnetic separator on the overflow obtained in the step S5, wherein the material with the specification of concentrate is subjected to the step S8, and the material with the specification of tailings is subjected to the step S9; s7, carrying out magnetic separation operation of a disc magnetic separator on the underflow obtained in the step S5, wherein the material with the specification of concentrate is subjected to the step S8, and the material with the specification of tailings is subjected to the step S9; S8, mixing the concentrates obtained in the steps S6 and S7, and then re-feeding the concentrate into the stage grinding separation and elutriation and concentration operation; s9, concentrating the tailings obtained in the steps S6 and S7 through a large tailings well, and then using the concentrated tailings for underground filling or ecological reclamation.
2. The beneficiation process for improving the recovery rate of magnetic iron by the graded magnetic separation 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 recovery rate of the magnetic iron by the graded magnetic separation of the tailings with wide size fraction according to claim 2 is characterized in that 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 stage of grinding, and the stage of grinding is followed by a stage of grading.
4. A mineral separation process for improving the recovery rate of magnetic iron by using the graded magnetic separation of tailings with wide grain size range as claimed in claim 3, wherein the step of graded sand setting returns to the step of grinding, and the step of graded overflow is mixed with a product with the size of-0.5 mm and then subjected to the step of magnetic separation.
5. The beneficiation process for improving the recovery rate of magnetic iron by graded magnetic separation of tailings with wide size fraction according to claim 4, wherein the concentrate obtained by the primary magnetic separation enters a secondary grading, and the tailings obtained by the primary magnetic separation are subjected to step S5.
6. The beneficiation process for improving the recovery rate of the magnetic iron by the graded magnetic separation of the tailings with wide grain size range according to claim 5, wherein the overflow of the second-stage grading is subjected to the second-stage magnetic separation, the settled sand of the second-stage grading is subjected to the second-stage ore grinding, and the settled sand returns to the second-stage grading after the second-stage ore grinding treatment.
7. The beneficiation process for improving the recovery rate of magnetic iron by graded magnetic separation of tailings with wide size fraction according to claim 6, wherein the magnetic concentrate obtained by the two-stage magnetic separation enters a high-frequency fine screen, and tailings obtained by the two-stage magnetic separation are subjected to step S5.
8. The mineral separation process for improving the recovery rate of magnetic iron by grading and magnetic separation of tailings with wide size fraction according to claim 7, wherein the high-frequency fine screen is used for screening the two-stage magnetic separation 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 magnetic iron recovery rate through graded magnetic separation of 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 by grading and magnetic separation of tailings with wide size fractions. 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 and process is the key for recycling the magnetic iron minerals in the tailings to the maximum extent. In the aspects of tailing recleaning or tailing recycling in the prior art, a conventional permanent magnet drum type magnetic separator is often adopted, but the type of magnetic separator has low pulp treatment capacity and recovery rate during operation, and the occupied area in the process arrangement is too large, so that 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 and cage-type tailing recovery magnetic separation technology and equipment are developed, and the disc-type and cage-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 are treated, the throughput of ore pulp is high, and the number of equipment is increased to improve the equipment treatment capacity, so that the amount of investment for transformation is too high. 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 by grading and magnetic separation of tailings with wide size fraction, and aims to solve the problems of low concentration of the iron tailings, wide particle size distribution range, resource waste caused by difficult recovery, high equipment consumption and high initial investment 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 beneficiation process for improving the recovery rate of magnetic iron by graded magnetic separation of tailings with wide size fraction, 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, grading the mixed tailings obtained in the steps S3 and S4, wherein the material with the specification of overflow is subjected to the step S6, and the material with the specification of underflow is subjected to the step S7; S6, carrying out magnetic separation operation of a cage magnetic separator on the overflow obtained in the step S5, wherein the material with the specification of concentrate is subjected to the step S8, and the material with the specification of tailings is subjected to the step S9; s7, carrying out magnetic separation operation of a disc magnetic separator on the underflow obtained in the step S5, wherein the material with the specification of concentrate is subjected to the step S8, and the material with the specification of tailings is subjected to the step S9; S8, mixing the concentrates obtained in the steps S6 and S7, and then re-feeding the concentrate into the stage grinding separation and elutriation and concentration operation; s9, concentrating the tailings obtained in the steps S6 and S7 through a large tailings well, and then using the concentrated tailings for underground filling or ecological reclamation. Further, in the s