CN210585354U - Magnetite iron separation equipment - Google Patents
Magnetite iron separation equipment Download PDFInfo
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- CN210585354U CN210585354U CN201920809442.9U CN201920809442U CN210585354U CN 210585354 U CN210585354 U CN 210585354U CN 201920809442 U CN201920809442 U CN 201920809442U CN 210585354 U CN210585354 U CN 210585354U
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Abstract
The utility model discloses magnetite iron separation equipment, which comprises a coarse crushing unit, a middle crushing unit, a screening unit, a fine crushing unit, a powder ore storage unit, a ball milling unit, a grading unit, a magnetic separation coarse separation unit, a magnetic separation fine separation unit and a magnetic separation scavenging unit; the coarse crushing unit, the middle crushing unit and the screening unit are sequentially connected, the screening unit is further respectively connected with the powder storage unit and the fine crushing unit, the powder storage unit is further connected with the ball milling unit, the ball milling unit comprises four billiard ball mills, the ball milling unit is further connected with the grading unit, the grading unit is further connected with the magnetic separation coarse separation unit, and the magnetic separation coarse separation unit is further respectively connected with the magnetic separation fine separation unit and the magnetic separation sweeping unit; by adopting the equipment, high-purity fine iron powder with TFe grade of more than 71.5 percent can be obtained, the content of acid insoluble substances is reduced to be less than 0.3 percent, the grade of mFe in the magnetic separation tailings is lower than 0.38 percent, the recovery rate of magnetic iron reaches 98 percent, and the equipment has remarkable economic benefit and environmental protection effect.
Description
Technical Field
The utility model relates to a mineral processing technology field especially relates to a magnetite selection iron equipment.
Background
In the field of iron ore separation, different processes are needed to be adopted for raw ores of different producing areas due to different components, so that the iron content in tailings is reduced as much as possible, and the recovery rate of iron is improved.
For example, for magnetite concentrate from Wenchuan green of Alba, Sichuan, the lumpiness of the mined raw ore is 400-plus 500 mm, and the current iron separation process of the ore comprises the following steps: after the crushing-screening process of three-section one-closed-circuit (the vibration sieve hole is 35 mm multiplied by 45 mm), a CT0809 magnetic roller is adopted to carry out dry magnetic separation and tailing discarding (the magnetic field intensity is 1800 Gs); after the dry magnetic concentrate is subjected to closed circuit grinding to a certain fineness, recovering iron concentrate (scavenging is a permanent magnet disc type machine) by adopting a 'primary coarse and fine sweeping' wet type low-intensity magnetic separation process, and obtaining the iron concentrate with the TFe grade of about 65.7%; the high-purity iron concentrate powder can be further obtained through regrinding and sorting.
The problems existing in the current iron separation process comprise: (1) the dry type tailing throwing granularity is too large, the content of magnetic iron in tailings is too high, the mFe grade is about 6%, the overall magnetic iron recovery rate of the process is low, about 80%, and (2) the ore grinding efficiency is low, and an optimization space exists; (3) the recovery rate of the magnetic iron is low, and the loss amount of the magnetic iron in the magnetic separation tailings is large.
Disclosure of Invention
An object of the utility model is to provide an iron equipment is selected to magnetite to solve above-mentioned problem.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a magnetite iron separation device comprises a coarse crushing unit, a medium crushing unit, a screening unit, a fine crushing unit, a fine ore storage unit, a ball milling unit, a grading unit, a magnetic separation coarse separation unit, a magnetic separation fine separation unit and a magnetic separation sweeping unit;
coarse crushing unit, well garrulous unit, screening unit connect gradually (delete and improve the magnetic pulley dry separation before), screening unit still connects respectively unit and the fine crushing unit are stored to the powder ore, unit still connects are stored to the powder ore ball-milling unit, the ball-milling unit includes four billiard ball mills, hierarchical unit is still connected to the ball-milling unit, hierarchical unit still connects the magnetic separation roughing unit, the magnetic separation roughing unit still connects respectively the unit is swept to choice magnetic separation unit and magnetic separation.
As a preferred technical scheme: the iron concentrate regrinding unit is connected with the magnetic separation and concentration unit.
As a preferred technical scheme: the screening unit is a vibrating screen, and the screen holes are 19.5mm multiplied by 19.5 mm.
As a preferred technical scheme: the four-billiard ball mill comprises three MQG1530 ball mills and one MQG2130 ball mill.
As a further preferable technical scheme: the initial steel ball loading scheme of the MQG2130 ball mill is as follows: phi 70: phi 60: phi 50: phi 40: phi 30= 10: 20: 20: 25: 25; the supplement scheme is as follows: phi 70: phi 60: phi 50: phi 40= 30: 20: 25: 25.
as a further preferable technical scheme: the initial steel ball loading scheme of the MQG1530 ball mill is as follows: phi 80: phi 70: phi 50: phi 40: phi 30= 10: 20: 20: 25: 25; the supplement scheme is as follows: phi 80: phi 70: phi 50: phi 40= 30: 10: 35: 25.
the method for selecting iron by adopting the equipment comprises the following steps:
(1) carrying out coarse crushing and intermediate crushing on raw ores and then screening;
(2) the sieved undersize materials enter a ball mill for ball milling, and the oversize materials are returned for sieving after fine crushing;
(3) pre-screening and grading after ball milling;
(4) carrying out wet low-intensity magnetic separation and rough separation on the classified overflow, and returning the sediment to ball milling;
(5) carrying out wet low-intensity magnetic separation and concentration on the magnetic separation rough concentrate after wet low-intensity magnetic separation rough concentration; after scavenging is carried out on the magnetic separation rough tailings after wet low-intensity magnetic separation rough separation, scavenged concentrate returns to wet low-intensity magnetic separation rough separation, and scavenged tailings are primary tailings;
(6) and carrying out wet low-intensity magnetic separation and concentration to obtain iron ore concentrate, and regrinding the iron ore concentrate to obtain high-purity iron ore concentrate and second-stage tailings.
In the step (1), the raw ore comprises, by mass, 40-50% of magnetite, 25-30% of muscovite, 10-15% of chlorite, 8-12% of quartz, 3-7% of calcite, and the average raw ore density is 3.2g/cm3。
Utility model people have carried out detailed analysis through the composition and the nature to the target raw ore, including having carried out X-ray diffraction and X-ray fluorescence spectrum, carry out mineral composition and be the semi-quantitative analysis of chemical composition, according to having constituteed nature, carried out the improvement of corresponding selection iron method, improve the rate of recovery of iron in the raw ore on the one hand, on the other hand reduces mFe's in the tailing grade to below 0.38% to can obtain the high-purity iron concentrate powder of TFe grade > 71.5%.
In the step (2), the grain diameter of the grinding raw ore is controlled to be-16 mm.
As a preferred technical scheme: in the step (2), ball milling is carried out until the grinding fineness is-200 meshes and accounts for 60 percent.
At present, aiming at the magnetite, the ball milling steel ball scheme adopted is phi 120: phi 100: phi 80: phi 60= 40: 40: 10: 10; the yield of the +0.3mm and +0.15mm fractions of the obtained ore is the highest by adopting the scheme for ball milling, namely the effective grinding effect is poor, and although the yield of the-0.01 mm over-grinding fraction of the scheme is the lowest, the effective grinding efficiency in production is low, and the grading circulation load of the ore is increased. By adopting the improved ball loading scheme, the phenomenon of overflow and crushing of ball milling can be reduced, the ore grinding effect is obviously improved, the yield of-0.045 mm size fraction is only 11.28 percent, and is 30.37 percent before improvement; the yield of-0.18 +0.045mm size fraction as an intermediate easy-to-select grade is as high as 78.37%, while the yield is only 30.63% before improvement;
by adopting the ball milling scheme, the ball milling can reach-200 meshes and account for about 60 percent; and to the definite of grinding ore size fraction, utility model people have carried out a large amount of experiments and have found: for magnetic separation feeding ore (namely, ore subjected to ball milling and classification and entering the wet low-intensity magnetic separation) with different grinding fineness and the maximum particle size of 0.3mm, the magnetic separation feeding ore grade is sequentially increased along with the increase of the grinding fineness, when the grinding fineness of minus 200 meshes is lower than 60%, the concentrate grade and the recovery rate are sequentially increased, but when the grinding fineness of minus 200 meshes reaches 70%, high-grade iron concentrate can be obtained, but the recovery rate begins to be reduced, which indicates that the over-ground magnetite cannot be effectively recovered, the grade and the recovery rate of the obtained iron concentrate are comprehensively considered, and the grinding fineness of minus 200 meshes is 60% which is the best.
The results of the ore grinding fineness test are shown in Table 1
TABLE 1 results of magnetic separation test of grinding fineness
In addition, in the existing ore grinding process, part of magnetite is over-ground, and the over-ground magnetite is difficult to effectively recover under a specific magnetic field intensity; therefore, the method reduces the yield of the over-grinding grade-0.04 mm grade fraction through the optimization of the ore grinding process, namely increases the yield of the optional grade fraction, thereby improving the recovery rate of the magnetite.
As a preferred technical scheme: in the step (3), the overflow maximum particle size during classification is controlled to be 0.25 mm. After the particle size is controlled according to the particle size, better mineral separation indexes can be obtained.
As a preferred technical scheme: in the step (4), the magnetic field intensity of the wet low-intensity magnetic separation rough concentration is 190 mT; in the step (5), the magnetic field intensity of the wet low-intensity magnetic separation is 150 mT.
Through a large number of experiments, the utility model discovers that the TFe grade is in a small descending trend along with the rise of the magnetic field intensity, the recovery rate is not obvious though rising in sequence, so the rougher magnetic field intensity is 190mT, and the experimental result is shown in a table 2; regarding the magnetic field strength of concentration, when the field strength is 120mT, the TFe grade of the obtained iron ore concentrate is high, but the recovery rate is reduced, the TFe grade of the concentrated ore concentrate is gradually increased along with the increase of the fineness of ore feeding by magnetic separation, and the experiment of the magnetic field strength of concentration is determined to be 150mT by comprehensive consideration, and is shown in Table 3.
TABLE 2 rough concentration magnetic separation intensity experiment results
TABLE 3 magnetic concentration Strength test results
Compared with the prior art, the utility model has the advantages of: high-purity iron concentrate with TFe grade of more than 71.5 percent and common iron concentrate with TFe grade of more than 65.7 percent can be obtained, acid insoluble substances are reduced to be less than 0.3 percent, mFe grade in magnetic separation tailings is lower than 0.38 percent, the recovery rate of magnetic iron can reach about 98 percent (the original method can only reach about 80 percent) under the condition that the content of the magnetic iron in the raw ore is about 16.5 percent, and the method has obvious economic benefit and environmental protection effect.
Drawings
Fig. 1 is a schematic structural diagram of an iron selecting device according to an embodiment of the present invention.
In the figure: 1. a coarse crushing unit; 2. a middle crushing unit; 3. a screening unit; 4. a fine crushing unit; 5. a fine ore bin; 6. a ball milling unit; 7. a classification unit; 8. a magnetic separation roughing unit; 9. a magnetic separation and fine selection unit; 10. a magnetic separation scavenging unit; 11. and an iron concentrate regrinding unit.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example (b):
referring to fig. 1, a magnetite iron separation device includes a coarse crushing unit 1 (in this embodiment, jaw type, PE-750 × 1060 ii), a medium crushing unit 2 (in this embodiment, cone, CS 420C), a sieving unit 3 (in this embodiment, vibrating screen), a fine crushing unit 4 (in this embodiment, cone CH430 MF), a powder ore bin 5, a ball milling unit 6, a classification unit 7 (spiral classifier), a magnetic separation coarse separation unit 8 (wet type), a magnetic separation unit 9 (wet type), a magnetic separation scavenging unit 10 (disk type magnetic separator), and an iron concentrate regrinding unit 11;
The method for selecting iron by adopting the equipment comprises the following steps:
(1) carrying out coarse crushing and intermediate crushing on raw ores and then screening;
the raw ore is analyzed to be light green gray, the ore mineral magnetite is magnetite, the gangue minerals mainly comprise muscovite, chlorite and a small amount of calcite, quartz, garnet and green cord stone, the composition of the raw ore is, by mass percent, about 45% of magnetite, about 27% of muscovite, about 12% of chlorite, about 10% of quartz, about 5% of calcite, about 1% of garnet and green cord stone, and the average density of the raw ore is 3.2g/cm3Belonging to fragile ores; the magnetic iron content in the raw ore is about 16.5 percent;
coarse crushing in jaw type PE-750X 1060 II; the middle-sized pieces are cone, CS 420C;
the sieve holes are 19.5mm multiplied by 19.5mm when in sieving;
(2) the sieved undersize materials enter a ball mill through a powder ore bin for ball milling, and the oversize materials are returned for sieving after fine crushing;
wherein the particle size of the grinding raw ore is controlled to be-16 mm;
during ball milling, four billiard ball mills are adopted in sequence, namely 1# MQG1530, 2# MQG1530, 3# MQG1530 and 4# MQG 2130;
the initial steel ball loading scheme of the MQG1530 ball mill is as follows: phi 80: phi 70: phi 50: phi 40: phi 30= 10: 20: 20: 25: 25; the supplement scheme is as follows: phi 80: phi 70: phi 50: phi 40= 30: 10: 35: 25
The initial steel ball loading scheme of the MQG2130 ball mill is as follows: phi 70: phi 60: phi 50: phi 40: phi 30= 10: 20: 20: 25: 25; the supplement scheme is as follows: phi 70: phi 60: phi 50: phi 40= 30: 20: 25: 25;
after 8 '18' ore grinding, the content of-200 meshes in the ore grinding product accounts for 60 percent;
(3) pre-screening and grading by adopting a spiral classifier after ball milling; the maximum overflow particle size during classification is controlled to be 0.25 mm;
(4) carrying out wet low-intensity magnetic separation and rough separation on the classified overflow, and returning the sediment to ball milling; in the step (4), the magnetic field intensity of the wet low-intensity magnetic separation rough concentration is 190 mT;
(5) carrying out wet low-intensity magnetic separation and concentration on the magnetic separation rough concentrate after wet low-intensity magnetic separation rough concentration; after scavenging is carried out on the magnetic separation rough tailings after wet low-intensity magnetic separation rough separation, scavenged concentrate returns to wet low-intensity magnetic separation rough separation, and scavenged tailings are primary tailings;
the magnetic field intensity of the wet low-intensity magnetic separation selection is 150 mT;
(6) and carrying out wet low-intensity magnetic separation and concentration to obtain iron ore concentrate, and regrinding the iron ore concentrate to obtain high-purity iron ore concentrate and second-stage tailings.
By adopting the method, the high-purity fine iron powder with TFe grade reaching 73.5 percent can be obtained, the acid insoluble substance is reduced to 0.3 percent, the mFe grade in the magnetic separation tailings is only 0.38 percent, and the recovery rate of the magnetic iron reaches about 98 percent.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The magnetite iron separation equipment is characterized by comprising a coarse crushing unit, a medium crushing unit, a screening unit, a fine crushing unit, a powder ore storage unit, a ball milling unit, a grading unit, a magnetic separation coarse separation unit, a magnetic separation fine separation unit and a magnetic separation sweeping unit;
coarse crushing unit, well garrulous unit, screening unit connect gradually, the screening unit still connects respectively unit and the fine crushing unit are stored to the powder ore, unit still connects is stored to the powder ore ball-milling unit, the ball-milling unit includes four billiard ball mills, grading unit is still connected to the ball-milling unit, grading unit still connects the magnetic separation roughing unit, the magnetic separation roughing unit still connects respectively magnetic separation choice unit and magnetic separation are swept and are selected the unit.
2. A magnetite iron separation apparatus according to claim 1, characterised in that: the iron concentrate regrinding unit is connected with the magnetic separation and concentration unit.
3. A magnetite iron separation apparatus according to claim 1, characterised in that: the screening unit is a vibrating screen, and the screen holes are 19.5mm multiplied by 19.5 mm.
4. A magnetite iron separation apparatus according to claim 1, characterised in that: the four-billiard ball mill comprises three MQG1530 ball mills and one MQG2130 ball mill.
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| CN201920809442.9U CN210585354U (en) | 2019-05-31 | 2019-05-31 | Magnetite iron separation equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090474A (en) * | 2020-09-21 | 2020-12-18 | 马钢集团设计研究院有限责任公司 | Production system and process of high-grade chromite lump ore |
| CN116966981A (en) * | 2023-07-28 | 2023-10-31 | 武汉海剑环保材料有限公司 | Device for manufacturing recycled concrete by using building solid waste |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090474A (en) * | 2020-09-21 | 2020-12-18 | 马钢集团设计研究院有限责任公司 | Production system and process of high-grade chromite lump ore |
| CN116966981A (en) * | 2023-07-28 | 2023-10-31 | 武汉海剑环保材料有限公司 | Device for manufacturing recycled concrete by using building solid waste |
| CN116966981B (en) * | 2023-07-28 | 2024-03-26 | 武汉海剑环保材料有限公司 | Device for manufacturing recycled concrete by using building solid waste |
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