Efficient ore grinding and grading process for iron ore

Abstract

The invention discloses an efficient ore grinding and grading process for iron ore, and relates to the technical field of iron ore beneficiation. The efficient ore grinding and grading process for the iron ore is characterized by comprising the following specific operation steps that S1, materials are added into a first-section ball mill to be treated, and the treated materials are subjected to next-step operation; and S2, the materials obtained in the step S1 are subjected to primary magnetic operation, unqualified materials are selected as fine total tailings, and qualified materials are subjected to the step S3. According to the efficient ore grinding and grading process for the iron ore, the tower mill is adopted for two-stage ore grinding, the ore grinding granularity is more uniform, the ore grinding efficiency and the metal recovery rate are improved, and the ore dressing cost is reduced. The method provided by the invention is suitable for the dressing plant for treating the same type of ores, has the advantages of high ore grinding and grading efficiency and low production cost, adopts the efficient and energy-saving tower mill to replace a two-stage ball mill, can stabilize and even improve the existing production indexes, and can realize energy conservation, consumption reduction, cost reduction and efficiency improvement of the dressing plant.

Description

Technical Field

[0001] The invention relates to the technical field of iron ore beneficiation, and in particular to a high-efficiency iron ore grinding and separation process. Background Art

[0002] Iron ore beneficiation traditionally adopts stage grinding and stage separation, in which ball mills are used for grinding. The grinding particle size of ball mills is uneven and there are over-grinding sites, which affects the subsequent separation efficiency and the quality of concentrate products. At the same time, the tailings after the overflow separation of the second-stage ball mill are too fine in particle size, and the comprehensive utilization value is not high; the cost of filling and secondary utilization of fine-grained tailings is too high, which is not conducive to improving the economic benefits of the beneficiation plant.

[0003] As a stirring grinding equipment, tower mill has the characteristics of low grinding energy consumption, less secondary ore slime generated during the grinding process, minerals are not easily over-grinded, grinding particle size is uniform, equipment installation occupies a small area, simple foundation engineering, short installation period, good equipment safety, etc. It is widely used in grinding operations where minerals need to be dissociated. Application practice shows that tower mill grinding can save more than 20% energy compared with ball mill. The finer the grinding particle size, the more obvious the energy-saving effect. It is a high-efficiency and energy-saving grinding equipment generally recognized in the industry.

[0004] In the prior art, the iron ore grinding and separation process has low efficiency and relatively high labor costs, and product quality problems are prone to occur, which is not suitable for large-scale production. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides an efficient iron ore grinding and separation process, which solves the problems existing in the prior art.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an efficient iron ore grinding and separation process, the specific operation is as follows:

[0009] S1, adding the material into a first-stage ball mill for processing, and the processed material is subjected to the next step of operation;

[0010] S2, subjecting the material obtained in step S1 to a magnetic operation, selecting unqualified materials as fine tailings, and subjecting qualified materials to step S3;

[0011] S3, adding the obtained materials into the second cyclone, and carrying out step S4 for the large particle materials and step S5 for the small particle materials;

[0012] S4, processing the obtained material through a two-stage tower mill and then re-performing step S3;

[0013] S5, the obtained materials are subjected to a second magnetic operation, unqualified materials are selected as fine tailings, and qualified materials are subjected to step S6;

[0014] S6, demagnetize the obtained material, and then perform high-frequency fine screening operation, and perform step S7 on the material with particles larger than 0.11 mm, and perform step S8 on the material with particles smaller than 0.11 mm (if the particle size is equal to 0.11 mm, any one of steps S7 or S8 is randomly performed);

[0015] S7, perform the second concentration magnetic separation operation, unqualified materials are selected as fine total tailings, and qualified materials are repeated in step S4;

[0016] The under-screened materials in S8 and S6 are added to the first elutriator for operation, the overflowing materials are subjected to step S9, and the underflowing materials are subjected to step S10;

[0017] S9, perform a concentration magnetic separation operation to select unqualified materials as fine tailings, and proceed to step S7 for qualified materials;

[0018] S10, perform the three operations of the cyclone, the large particles of sedimentation are output as slag, and the overflow small particles are carried out to step S11;

[0019] S11, adding to the second elutriator for processing, the large particles of sedimentation are output as dregs, and the overflow small particles are processed into step S12;

[0020] S12, perform a concentration magnetic separation operation, unqualified products are selected as fine tailings, and qualified products proceed to step S7.

[0021] (III) Beneficial effects

[0022] The present invention provides an efficient iron ore grinding and separation process, which has the following beneficial effects:

[0023] The iron ore high-efficiency grinding and separation process feeds the crushed iron ore into a ball mill, the grinding product is fed into a hydrocyclone for classification, the cyclone overflow enters a magnetic separation, the cyclone sand settling returns to a ball mill for grinding, the primary magnetic separation concentrate enters the cyclone classification-two-stage tower mill closed-circuit grinding system, the cyclone overflow enters the secondary magnetic separation, the secondary magnetic separation concentrate is screened by a high-frequency fine screen, the product under the high-frequency fine screen is subjected to a first-stage elutriation magnetic separation, the first-stage elutriation concentrate is selected by a cyclone, the cyclone overflow is subjected to a second-stage elutriation magnetic separation, and a tower mill is used for two-stage grinding, the grinding particle size is more uniform, the grinding efficiency and metal recovery rate are improved, and the ore dressing cost is reduced. The method of the present invention is applicable to a ore dressing plant that processes the same type of ore, has high grinding separation efficiency, low production cost, and adopts an efficient and energy-saving tower mill to replace a two-stage ball mill, which can stabilize or even improve the existing production indicators, and can also achieve energy saving and consumption reduction, cost reduction and efficiency improvement of the ore dressing plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1 The present invention provides a technical solution: an efficient iron ore grinding and separation process, the specific operation is as follows:

[0027] S1, adding the material into a first-stage ball mill for processing, and the processed material is subjected to the next step of operation;

[0028] S2, subjecting the material obtained in step S1 to a magnetic operation, selecting unqualified materials as fine tailings, and subjecting qualified materials to step S3;

[0029] S3, adding the obtained materials into the second cyclone, and carrying out step S4 for the large particle materials and step S5 for the small particle materials;

[0030] S4, processing the obtained material through a two-stage tower mill and then re-performing step S3;

[0031] S5, the obtained materials are subjected to a second magnetic operation, unqualified materials are selected as fine tailings, and qualified materials are subjected to step S6;

[0032] S6, demagnetize the obtained material, and then perform high-frequency fine screening operation, and perform step S7 on the material with particles larger than 0.11 mm, and perform step S8 on the material with particles smaller than 0.11 mm (if the particle size is equal to 0.11 mm, any one of steps S7 or S8 is randomly performed);

[0033] S7, perform the second concentration magnetic separation operation, unqualified materials are selected as fine total tailings, and qualified materials are repeated in step S4;

[0034] The under-screened materials in S8 and S6 are added to the first elutriator for operation, the overflowing materials are subjected to step S9, and the underflowing materials are subjected to step S10;

[0035] S9, perform a concentration magnetic separation operation to select unqualified materials as fine tailings, and proceed to step S7 for qualified materials;

[0036] S10, perform the three operations of the cyclone, the large particles of sedimentation are output as slag, and the overflow small particles are carried out to step S11;

[0037] S11, adding to the second elutriator for processing, the large particles of sedimentation are output as dregs, and the overflow small particles are processed into step S12;

[0038] S12, perform a concentration magnetic separation operation, unqualified products are selected as fine tailings, and qualified products proceed to step S7.

[0039] In summary, the iron ore efficient grinding and separation process feeds the iron ore after crushing into a ball mill, the grinding product is fed into a hydrocyclone for classification, the cyclone overflow enters a magnetic separation, the cyclone sand settling returns to a ball mill, the primary magnetic separation concentrate enters the cyclone classification-two-stage tower mill closed-circuit grinding system, the cyclone overflow enters the secondary magnetic separation, the secondary magnetic separation concentrate is screened by a high-frequency fine screen, the high-frequency fine screen screened product undergoes a first-stage elutriation magnetic separation, the first-stage elutriation concentrate is selected by a cyclone, the cyclone overflow undergoes a second-stage elutriation magnetic separation, and the tower mill is used for the second-stage grinding, the grinding particle size is more uniform, the grinding efficiency and metal recovery rate are improved, and the ore dressing cost is reduced. The method of the present invention is applicable to a ore dressing plant that processes the same type of ore, has high grinding separation efficiency, low production cost, and adopts an efficient and energy-saving tower mill to replace a two-stage ball mill, which can stabilize or even improve the existing production indicators, and can also achieve energy saving and consumption reduction, cost reduction and efficiency improvement of the ore dressing plant.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient iron ore grinding and separation process, characterized in that: The specific operations are as follows: S1, adding the material into a first-stage ball mill for processing, and the processed material is subjected to the next step of operation; S2, subjecting the material obtained in step S1 to a magnetic operation, selecting unqualified materials as fine tailings, and subjecting qualified materials to step S3; S3, adding the obtained materials into the second cyclone, and carrying out step S4 for the large particle materials and step S5 for the small particle materials; S4, processing the obtained material through a two-stage tower mill and then re-performing step S3; S5, the obtained materials are subjected to a second magnetic operation, unqualified materials are selected as fine tailings, and qualified materials are subjected to step S6; S6, demagnetize the obtained material, and then perform high-frequency fine screening operation, and perform step S7 on the material with particles larger than 0.11 mm, and perform step S8 on the material with particles smaller than 0.11 mm (if the particle size is equal to 0.11 mm, any one of steps S7 or S8 is randomly performed); S7, perform the second concentration magnetic separation operation, unqualified materials are selected as fine total tailings, and qualified materials are repeated in step S4; The under-screened materials in S8 and S6 are added to the first elutriator for operation, the overflowing materials are subjected to step S9, and the underflowing materials are subjected to step S10; S9, perform a concentration magnetic separation operation, select unqualified materials as fine tailings, and proceed to step S7 for qualified materials; S10, perform the three operations of the cyclone, the large particles of sedimentation are output as slag, and the overflow small particles are carried out to step S11; S11, adding to the second elutriator for processing, the large particles of sedimentation are output as slag, and the overflow small particles are processed into step S12; S12, perform a concentration magnetic separation operation, unqualified products are selected as fine tailings, and qualified products proceed to step S7.

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