CN114100845A - Method for controlling fineness of two-stage overflow of magnetite separation plant - Google Patents
Method for controlling fineness of two-stage overflow of magnetite separation plant Download PDFInfo
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- CN114100845A CN114100845A CN202111397759.4A CN202111397759A CN114100845A CN 114100845 A CN114100845 A CN 114100845A CN 202111397759 A CN202111397759 A CN 202111397759A CN 114100845 A CN114100845 A CN 114100845A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000000926 separation method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 33
- 238000007599 discharging Methods 0.000 claims description 18
- 238000007885 magnetic separation Methods 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 14
- 239000012141 concentrate Substances 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 7
- 239000012467 final product Substances 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000002002 slurry Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 11
- 230000006872 improvement Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 230000036632 reaction speed Effects 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
- B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
- B03B5/32—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions using centrifugal force
- B03B5/34—Applications of hydrocyclones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The invention discloses a method for controlling the fineness of two-stage overflow of a magnetite separation plant, and relates to the technical field of mineral separation. The method for controlling the fineness of the second-stage overflow of the magnetite separation plant comprises the following specific operations: the magnetite raw ore to be selected is crushed by a high-pressure roller and then fed into a dewatering screen, the oversize product is fed into a first-section ball mill for grinding, and the undersize product enters a first-section pump pool. According to the method for controlling the fineness of the second-stage overflow of the magnetite separation plant, the particle size of a product can be well controlled by adopting a grinding process flow of a high-pressure roller and a two-stage grinding, a grinding system has sufficient spare space to provide a foundation for subsequent production improvement, the water replenishing amount of a second-stage pump pool and the pressure of a grading device are adjusted, the field operation difficulty is small, the reaction speed is high, the fineness of the second-stage overflow can be stably controlled to be more than 90% of-200 meshes, and meanwhile, the process flow and the operation are simple, so that the method can be suitable for most of single magnetite separation plants.
Description
Technical Field
The invention relates to the technical field of mineral separation, in particular to a method for controlling the fineness of secondary overflow of a magnetite separation plant.
Background
Iron and steel are important foundations for national economic development, and the economic growth of China has no way to meet the demand of iron ore. However, iron ore resources in China have poor endowment, much lean ore and higher development and utilization cost, and the international iron ore supply is influenced by the combination of fresh water valley, force development, must and must development and the like, so that the gap between the supply and demand of iron ore in China is further expanded in recent years, and the external dependence continuously climbs. Under the background of the current supply side innovation and environmental protection yield limit of the steel industry, the improvement of the utilization rate of iron ores in China is urgently needed, and the stable high-level supply and demand relationship is maintained.
For magnetite separation plants, the secondary overflow is usually the final product of the ore grinding classification stage, which is the raw material for the separation operation. The fineness of the second-stage overflow can directly influence the iron ore sorting index and is a determining factor of the iron ore concentrate product.
In the prior art, most methods adopted by each large separation plant for stabilizing the fineness of the second-stage overflow are that high-pressure roller operation is increased, the granularity composition of raw materials entering an ore grinding classification system is reduced, and the working pressure of the ore grinding classification system is reduced, but even if the working pressure of the ore grinding classification system is reduced, the fineness of the second-stage overflow serving as a final product cannot be stably controlled, and the fluctuation range is +/-5%.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for controlling the fineness of the secondary overflow of a magnetite separation plant, and solves the problems that in the prior art, most methods are adopted by each large separation plant to stabilize the fineness of the secondary overflow, namely, high-pressure roller operation is increased, the granularity composition of raw materials entering an ore grinding classification system is reduced, the working pressure of the ore grinding classification section is reduced, but even if the working pressure of the ore grinding classification system is reduced, the fineness of the secondary overflow serving as a final product cannot be stably controlled, and the fluctuation range is +/-5%.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for controlling the fineness of a second-stage overflow of a magnetite separation plant specifically comprises the following operations:
(1) the magnetite raw ore to be selected is crushed by a high-pressure roller and then fed into a dewatering screen, the oversize product is fed into a first-section ball mill for grinding, and the undersize product enters a first-section pump pool.
(2) Discharging the ground pulp obtained in step (1) into a primary pump sump.
(3) And (3) pumping the pump pool products in the steps (1) and (2) into a section of grading hydrocyclone unit.
(4) Discharging the graded overflow product which is obtained in the step (3) and accounts for 63 +/-3 percent of the-200 meshes into a first-stage weak magnetic separation operation, and directly discharging the first-stage magnetic separation tailings as tailings.
(5) And (4) discharging the first-stage magnetic concentrate obtained in the step (4) into a second-stage grading hydrocyclone unit, wherein a second-stage grading overflow product is a final product of the grinding and grading system.
(6) And (4) discharging the secondary graded settled sand product obtained in the step (5) into a ball mill.
(7) And (4) discharging the ore grinding product of the ball mill in the step (6) into a two-stage pump pool.
(8) And (4) pumping the product of the second-stage pump pool in the step (7) back to the second-stage graded hydrocyclone unit through a slurry pump.
(9) And adjusting the pressure of the second-stage hydrocyclone to 140Kpa, adding water into the pump pool to 800m3/h, and controlling the concentration of the second-stage overflow product to be below 12%, namely controlling the fineness of the second-stage overflow to be-200 meshes and account for more than 90%.
(10) And (3) carrying out magnetic separation operation twice and concentrated magnetic dehydration operation once on a sample with the fineness of-200 meshes accounting for more than 90%, so as to obtain a high-purity iron concentrate product with the Fe grade of more than 65.80%, wherein the recovery rate of the magnetic separation operation can reach more than 85%.
(III) advantageous effects
The invention provides a method for controlling the fineness of secondary overflow of a magnetite separation plant. The method has the following beneficial effects:
according to the method for controlling the fineness of the second-stage overflow of the magnetite separation plant, the particle size of a product can be well controlled by adopting a grinding process flow of a high-pressure roller and a two-stage grinding, a grinding system has sufficient spare space to provide a foundation for subsequent production improvement, the water replenishing amount of a second-stage pump pool and the pressure of a grading device are adjusted, the field operation difficulty is small, the reaction speed is high, the fineness of the second-stage overflow can be stably controlled to be more than 90% of-200 meshes, and meanwhile, the process flow and the operation are simple, so that the method can be suitable for most of single magnetite separation plants.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: a method for controlling the fineness of a second-stage overflow of a magnetite separation plant specifically comprises the following operations:
(1) the magnetite raw ore to be selected is crushed by a high-pressure roller and then fed into a dewatering screen, the oversize product is fed into a first-section ball mill for grinding, and the undersize product enters a first-section pump pool.
(2) Discharging the ground pulp obtained in step (1) into a primary pump sump.
(3) And (3) pumping the pump pool products in the steps (1) and (2) into a section of grading hydrocyclone unit.
(4) Discharging the graded overflow product which is obtained in the step (3) and accounts for 63 +/-3 percent of the-200 meshes into a first-stage weak magnetic separation operation, and directly discharging the first-stage magnetic separation tailings as tailings.
(5) And (4) discharging the first-stage magnetic concentrate obtained in the step (4) into a second-stage grading hydrocyclone unit, wherein a second-stage grading overflow product is a final product of the grinding and grading system.
(6) And (4) discharging the secondary graded settled sand product obtained in the step (5) into a ball mill.
(7) And (4) discharging the ore grinding product of the ball mill in the step (6) into a two-stage pump pool.
(8) And (4) pumping the product of the second-stage pump pool in the step (7) back to the second-stage graded hydrocyclone unit through a slurry pump.
(9) And adjusting the pressure of the second-stage hydrocyclone to 140Kpa, adding water into the pump pool to 800m3/h, and controlling the concentration of the second-stage overflow product to be below 12%, namely controlling the fineness of the second-stage overflow to be-200 meshes and account for more than 90%.
(10) And (3) carrying out magnetic separation operation twice and concentrated magnetic dehydration operation once on a sample with the fineness of-200 meshes accounting for more than 90%, so as to obtain a high-purity iron concentrate product with the Fe grade of more than 65.80%, wherein the recovery rate of the magnetic separation operation can reach more than 85%.
Example (b):
(1) subjecting a sample which is crushed by a high-pressure roller and contains Fe of-3 mm and is 31 +/-1 percent to dehydration, classification and screening, wherein the size of a screen hole is 0.3mm, an oversize product (+0.3mm size fraction) enters a section of MQS4060 ball mill, and an undersize product (-0.3mm) enters a section of pump pool;
(2) and all the first-stage grinding products enter the first-stage pump pool after being discharged. Pumping the pump pool ore pulp into 4 hydrocyclone groups with the diameter of 350mm by a slurry pump, wherein the grading pressure is 100Kpa, and the fineness of a first-stage graded overflow product is-200 meshes (63 +/-3)%. Returning the first-stage graded sand setting product to a first-stage ball mill for regrinding;
(3) the first-stage classified overflow product enters an XCTB1236 weak magnetic separator, the first-stage weak magnetic concentrate enters a second-stage hydrocyclone, and the first-stage weak magnetic tailings are discharged as tailings;
(4) the two-section hydrocyclone group consists of 3 hydrocyclones with the diameter of 350mm, a two-section grading overflow product is a product entering a magnetic separation operation, and a two-section grading sand setting product enters a two-section MQS4060 ball mill;
(5) the fineness of the ground ore product of the second-stage ball mill is-200 meshes (72 +/-2)%, the ground ore product enters a second-stage pump pool, and then the ground ore product is pumped back to a second-stage hydrocyclone group by a slurry pump;
(6) and adjusting the pressure of the second-stage hydrocyclone to 140Kpa, adding water into the pump pool to 800m3/h, and controlling the concentration of the second-stage overflow product to be below 12%, namely controlling the fineness of the second-stage overflow to be-200 meshes and account for more than 90%.
(7) And (3) carrying out magnetic separation operation twice and concentrated magnetic dehydration operation once on a sample with the fineness of-200 meshes accounting for more than 90%, so as to obtain a high-purity iron concentrate product with the Fe grade of more than 65.80%, wherein the recovery rate of the magnetic separation operation can reach more than 85%.
In conclusion, the method for controlling the fineness of the second-stage overflow of the magnetite separation plant adopts the grinding process flow of the high-pressure roller and the two-stage grinding, can well control the particle size of a product, has sufficient spare space for a grinding system, provides a foundation for subsequent production improvement, adjusts the water replenishing amount of a second-stage pump pool and the pressure of a grading device, has small difficulty in field operation, high reaction speed, can stably control the fineness of the second-stage overflow to be more than 90 percent of-200 meshes, has simple process flow and operation, and can be suitable for most of single magnetite separation plants.
The invention provides a new method for controlling the fineness of two-stage overflow in an iron ore dressing plant, which mainly comprises a high-pressure roller, two-stage ore grinding, two-stage grading and three-magnetic separation process. The novel ore grinding grading adjustment process can be adopted for similar single magnetite ores, and the secondary overflow fineness can be stabilized to be more than 90 percent of minus 200 meshes by adjusting the supplemented water amount and the secondary grading pressure of a secondary pump pool, so that the grade of the final iron ore concentrate product is ensured to be more than 65.80 percent. The method can be suitable for popularization and application in the transformation of any single magnetite ore grinding process.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A method for controlling the fineness of two-stage overflow of a magnetite separation plant is characterized by comprising the following steps: the specific operation is as follows:
(1) the magnetite raw ore to be selected is crushed by a high-pressure roller and then fed into a dewatering screen, the oversize product is fed into a first-section ball mill for grinding, and the undersize product enters a first-section pump pool.
(2) Discharging the ground pulp obtained in step (1) into a primary pump sump.
(3) And (3) pumping the pump pool products in the steps (1) and (2) into a section of grading hydrocyclone unit.
(4) Discharging the graded overflow product which is obtained in the step (3) and accounts for 63 +/-3 percent of the-200 meshes into a first-stage weak magnetic separation operation, and directly discharging the first-stage magnetic separation tailings as tailings.
(5) And (4) discharging the first-stage magnetic concentrate obtained in the step (4) into a second-stage grading hydrocyclone unit, wherein a second-stage grading overflow product is a final product of the grinding and grading system.
(6) And (4) discharging the secondary graded settled sand product obtained in the step (5) into a ball mill.
(7) And (4) discharging the ore grinding product of the ball mill in the step (6) into a two-stage pump pool.
(8) And (4) pumping the product of the second-stage pump pool in the step (7) back to the second-stage graded hydrocyclone unit through a slurry pump.
(9) And adjusting the pressure of the second-stage hydrocyclone to 140Kpa, adding water into the pump pool to 800m3/h, and controlling the concentration of the second-stage overflow product to be below 12%, namely controlling the fineness of the second-stage overflow to be-200 meshes and account for more than 90%.
(10) And (3) carrying out magnetic separation operation twice and concentrated magnetic dehydration operation once on a sample with the fineness of-200 meshes accounting for more than 90%, so as to obtain a high-purity iron concentrate product with the Fe grade of more than 65.80%, wherein the recovery rate of the magnetic separation operation can reach more than 85%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921523A (en) * | 2012-12-03 | 2013-02-13 | 云南磷化集团有限公司 | Method for improving grinding efficiency and classification efficiency |
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| CN112742591A (en) * | 2020-11-30 | 2021-05-04 | 洛阳矿山机械工程设计研究院有限责任公司 | Intelligent control system and method for vertical stirring mill |
-
2021
- 2021-11-19 CN CN202111397759.4A patent/CN114100845A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921523A (en) * | 2012-12-03 | 2013-02-13 | 云南磷化集团有限公司 | Method for improving grinding efficiency and classification efficiency |
| CN106269204A (en) * | 2016-08-17 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of energy saving technique processing extreme poverty bloodstone wet type pre-selecting rough concentrate |
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Application publication date: 20220301 |