CN117019377A - Magnetite efficient preselection process for associated sulphide ores - Google Patents
Magnetite efficient preselection process for associated sulphide ores Download PDFInfo
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- CN117019377A CN117019377A CN202311188475.3A CN202311188475A CN117019377A CN 117019377 A CN117019377 A CN 117019377A CN 202311188475 A CN202311188475 A CN 202311188475A CN 117019377 A CN117019377 A CN 117019377A
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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
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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Abstract
The invention discloses a magnetite efficient preselection process for associated sulphide ores, and belongs to the technical field of ore dressing. The preselection process comprises a full closed-circuit high-pressure roller grinding process, wherein the full closed-circuit high-pressure roller grinding process comprises the steps of carrying out high-pressure roller grinding treatment on crushed raw ores with the granularity of 12-2 mm, carrying out wet screening, carrying out dry separation treatment on screened oversize products by a dry belt type magnetic roller, carrying out wet separation and tail discarding treatment on undersize products by a drum type magnetic separator, and returning concentrate subjected to the dry separation treatment to the high-pressure roller grinding to form a closed circuit; the whole process reduces the grinding granularity, reduces the raw ore quantity entering the roller mill, improves the grinding grade, comprehensively utilizes the associated sulfide ore and waste stone resources, has the effects of energy conservation, consumption reduction and synergy, and comprehensively recovers the associated sulfide ore and waste stone resources; solves the technical problem of associated sulfide ore loss caused by magnetite of associated sulfide ore treated by the high-pressure roller grinding process flow in the prior art.
Description
Technical Field
The invention belongs to the technical field of ore dressing, and particularly relates to a magnetite efficient preselection process for associated sulphide ores.
Background
The Chinese iron ore is characterized by 'lean, fine and impurity', the production cost of the iron ore concentrate is high, and the market competitiveness can be improved only by comprehensively recovering various elements and waste stones by adopting a high-efficiency energy-saving low-cost ore dressing method. The basic principle of efficient mineral separation is that the mineral separation is more crushed and less ground, the mineral separation can be thrown earlier, the quality and the impurity are improved, and the mineral separation is comprehensively utilized. Based on the basic principle, the latest high-efficiency equipment and the matched process technology are adopted aiming at the characteristics of different ores, so that the aims of energy conservation, cost reduction, quality improvement and synergy are achieved. The mineral separation method which is economical for mineral separation of the magnetite ore comprises a weak magnetic bulk dry separation (bulk dry separation machine and magnetic pulley) and a fine fraction weak magnetic wet magnetic separation method.
The high-pressure roller mill is novel crushing equipment developed based on the static pressure crushing principle in the 80 th century, has the remarkable characteristics of small occupied area, simple structure, high treatment capacity, high grinding ratio, low unit energy consumption, low abrasion and the like, and is used as super-fine crushing equipment in metallurgical mines in China at present. Compared with the conventional ore grinding process flow, the high-pressure roller grinding process flow has strong adaptability, is easy to realize automatic control, can improve the grindability of ores, realizes the advantages of wet coarse grain tailing discarding, energy saving, consumption reduction, low investment and operation cost and the like, and the high-pressure roller grinding superfine grinding process flow applied to magnetite mines at present mainly comprises a high-pressure roller grinding process flow, a wet screening process flow, a full closed circuit process, an undersize wet magnetic separation tailing discarding process flow, a magnetic separation coarse concentrate entering a grinding system, a high-pressure roller grinding process flow, a dry screening process flow, a full closed circuit process flow, an undersize wet magnetic separation tailing discarding process flow, a magnetic separation coarse concentrate entering a grinding system and the like. Conventional feeding granularity of the magnet mine high-pressure roller mill is 20-60 mm, the granularity range of screening closed circuit is 3-5 mm, such as the granularity of feeding granularity of the high-pressure roller mill of the concave mountain ore dressing plant of Ma Gangna mountain mining company, the Fujian Makuh iron ore dressing plant and the inner Mongolian Bao iron ore dressing plant is 20mm, and the granularity of wet type closed circuit screening is 3mm. The granularity of the roller mill is controlled to be-3 mm through high-pressure roller mill wet screening, wet magnetic separation and tailing discarding are carried out, the grinding amount is reduced, the grade of raw ore is improved, and the purposes of reducing cost and enhancing efficiency are achieved. However, when magnetite associated with sulphide ores is treated by the high-pressure roller grinding process flow, the sulphide ores (chalcopyrite and pyrite) associated with the raw ores are nonmagnetic useful minerals and enter tailings, so that the loss of the useful minerals is caused, and the economic benefit is adversely affected.
Through retrieval, chinese patent application No. CN201810728974.X discloses a 'magnetite high-pressure roller grinding wet preselection-stage grinding-fine screen tower grinding magnetic separation process', wherein a high-pressure roller grinding wet screening full closed process is adopted, -wet preselection is carried out by 3mm, and raw ore entering grinding is reduced. The process is only suitable for single magnetite ore, and if the single magnetite ore contains associated pyrite or chalcopyrite and other sulfide ores needing comprehensive recovery, the sulfide ores are non-magnetic minerals and enter tailings, so that the loss of the associated sulfide ores is caused.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the loss of associated sulfide ores can be caused when magnetite of the associated sulfide ores is treated by the high-pressure roller grinding process flow in the prior art, the invention provides an efficient magnetite preselection process of the associated sulfide ores.
2. Technical proposal
In order to solve the problems, the invention adopts the following technical scheme:
the magnetite high-efficiency pre-selection process of the associated sulphide ore comprises a full closed-circuit high-pressure roller grinding process, wherein the full closed-circuit high-pressure roller grinding process comprises the steps of carrying out high-pressure roller grinding treatment on crushed raw ore with the granularity of 12-2 mm by a high-pressure roller grinder, carrying out wet screening, carrying out dry separation treatment on screened oversize products by a dry type belt type magnetic roller, carrying out wet separation and tail discarding treatment on undersize products by a drum type magnetic separator, and returning concentrate subjected to the dry separation treatment to the high-pressure roller grinder to form a closed circuit; the whole process reduces the grinding granularity, reduces the raw ore quantity entering the roller mill, improves the grinding grade, comprehensively utilizes the associated sulfide ore and waste stone resources, has the effects of energy conservation, consumption reduction and synergy, and comprehensively recovers the associated sulfide ore and waste stone resources.
The further technical proposal comprises the following specific steps:
a) Crushing raw ore to the granularity of-12 mm, and carrying out wet medium-field magnetic separation on the raw ore by a magnetic separator to obtain magnetic concentrate and magnetic tailings;
b) Screening the magnetic concentrate obtained in the step a) by using a vibrating screen to obtain an oversize product and an undersize product, wherein the undersize product enters an iron grinding system of a concentrating mill;
c) Performing high-pressure roller grinding superfine grinding treatment on the vibrating screen oversize product obtained in the step b) to obtain a high-pressure roller grinding ore discharge product;
d) Screening the high-pressure roller mill ore discharge product obtained in the step c) by a vibrating screen to obtain an on-screen product and an under-screen product of the vibrating screen;
e) Carrying out dry type weak magnetic separation on the oversize product obtained in the step d) to obtain magnetic concentrate and magnetic tailings, and mixing the magnetic concentrate with the oversize product obtained in the step b) to serve as ore feeding of a high-pressure roller mill;
f) Carrying out weak magnetic wet magnetic separation on the undersize product obtained in the step d) to obtain magnetic concentrate and magnetic tailings, wherein the magnetic concentrate enters an iron grinding system of a concentrating mill;
g) Screening the magnetic separation tailings in the step f) and the step a) by a vibrating screen to obtain an on-screen coarse grain product and an undersize ore pulp product; and (3) throwing the coarse grain product on the screen into a tail, and enabling the ore pulp product under the screen to enter a copper-sulfur flotation system so as to recover chalcopyrite and pyrite.
According to a further technical scheme, the TFe grade of the raw ore is 30-40%, mFe 25.8.8-35.0%, cu 0.02-0.09% and S1.5-3.2%.
According to a further technical scheme, the magnetic separator in the step a) is an external magnetic type magnetic separator, the rotating speed of the rotary drum is 8-16 revolutions per minute, the gradient is 9-12 ℃, the concentration of ore-feeding solids is 30-50%, and the magnetic field strength is 350-450 mT; in the step b), the vibrating screen is a linear vibrating screen, and the size of the screen holes is 2mm; in the step c), the high-pressure roller mill is a cylindrical pin roller surface, and the pressure of the roller surface of the high-pressure roller mill is 4.5-5.5N/mm 2 The method comprises the steps of carrying out a first treatment on the surface of the In the step e), dry type low-intensity magnetic separation uses a dry type belt type magnetic roller, the magnetic field intensity is 250-350 mT, and the belt speed is 1.25-2.0 m/s; in the step f), a wet downstream type drum type magnetic separator is used for weak magnetic wet magnetic separation, and the magnetic field intensity of a drum surface is 250-300 mT; in the step g), the vibrating screen is a linear vibrating screen, and the screen holes are 1mm.
3. Advantageous effects
(1) The magnetite high-efficiency preselection process of the associated sulphide ore adopts a full-closed-circuit high-pressure roller grinding process of 12-2 mm high-pressure roller grinding, 2mm wet screening, on-screen dry separation and undersize wet separation and tailing discarding, so that the purposes of more crushing, less grinding and early polishing are realized, and the purposes of energy conservation and consumption reduction are achieved; the roller mill product is subjected to screening and grading magnetic separation, products with different particle sizes are treated by adopting different magnetic separation equipment, the tailing discarding effect is good, and the recovery rate of iron is high. The product under the screen of the high-pressure roller mill is subjected to roller milling of the high-pressure roller mill, so that the grindability is improved, and the energy conservation and consumption reduction of an ore milling system are facilitated;
(2) According to the magnetite efficient preselection process for associated sulphide ores, wet magnetic separation is carried out on the finely crushed products of-12 mm, so that the yield of subsequent operation is reduced to the greatest extent through tail discarding, the equipment model specification is reduced, and investment and cost are reduced; because the concentrate concentration of the magnetic concentrate products is lower than 12mm, the moisture content is high, the magnetic concentrate products cannot directly enter a high-pressure roller mill, the magnetic concentrate products are sieved by a linear vibrating screen, the moisture of the products with the size of 12-2 mm on the screen is controlled to be less than 6%, the requirements of entering the high-pressure roller mill are met, the granularity of the products under the screen is controlled to be less than 2mm, and the products directly enter a subsequent ore grinding system, so that the load of the high-pressure roller mill is also reduced;
(3) According to the magnetite efficient preselection process for the associated sulphide ores, 1mm screening classification is carried out on the-2 mm magnetic separation tailings according to the granularity characteristic that the fine fraction distribution of the sulphide ores in the tailings is high, the content of the sulphide ores on the screen is low, and the magnetite is sold as building materials, so that the ore quantity of subsequent operations is reduced, and the purposes of reducing cost and enhancing efficiency are achieved; the content of sulfide ore of the undersize product is higher, and the undersize product enters a sulfide ore grinding and selecting system to comprehensively recover chalcopyrite and pyrite, thereby comprehensively recovering sulfide ore;
(4) According to the magnetite efficient preselection process for the associated sulphide ores, through the wet preselection tailing discarding process and the high-pressure roller grinding ultrafine tailing discarding process for the finely crushed products, the grinding granularity is reduced, the raw ore quantity entering a roller mill is reduced, the grinding grade is improved, the associated sulphide ores and waste stone resources are comprehensively utilized, and the effects of energy conservation, consumption reduction and synergy are achieved, and meanwhile the associated sulphide ores and the waste stone resources are comprehensively recovered.
Drawings
FIG. 1 is a process flow diagram of an efficient magnetite pre-selection process for associated sulphide ores in accordance with an embodiment of the invention;
FIG. 2 is a schematic diagram of a high efficiency preselected production system according to an embodiment of the present invention.
In the figure: 1. a finely divided product bin; 2. a first adhesive tape machine; 3. a slurry making distribution box; 4. an external magnetic concentrator; 5. a first linear vibrating screen; 6. a second linear vibrating screen; 7. a second adhesive tape machine; 8. a third adhesive tape machine; 9. buffering the first ore bin; 10. a variable frequency feeding adhesive tape machine; 11. a pressure stabilizing bearing bucket; 12. high-pressure roller mill; 13. a fifth adhesive tape machine; 14. buffering a second ore bin; 15. a sixth adhesive tape machine; 16. a linear vibrating screen III; 17. dry belt type magnetic roller; 18. seventh, the adhesive tape machine; 19. a tape machine eight; 20. a drum magnetic separator; 21. an iron grinding and selecting system; 22. copper sulfur flotation systems.
Detailed Description
The invention is further described below in connection with specific embodiments and the accompanying drawings.
Example 1
The magnetite high-efficiency pre-selection process of the associated sulphide ore comprises a full closed-circuit high-pressure roller grinding process, wherein the full closed-circuit high-pressure roller grinding process comprises the steps of carrying out high-pressure roller grinding treatment on crushed raw ore with the granularity of 12-2 mm by a high-pressure roller grinder, carrying out wet screening, carrying out dry separation treatment on screened oversize products by a dry belt type magnetic roller, carrying out wet separation post-tailing discarding treatment on undersize products by a drum type magnetic separator, and returning concentrate after the dry separation treatment to the high-pressure roller grinder to form a closed circuit;
the magnetite high-efficiency pre-selection process of the associated sulphide ore reduces the grinding granularity, reduces the raw ore quantity entering the roller mill, improves the grinding grade, comprehensively utilizes the associated sulphide ore and waste stone resources, has the effects of energy conservation, consumption reduction and synergy, and comprehensively recovers the associated sulphide ore and the waste stone resources.
Example 2
The magnetite high-efficiency pre-selection process of the associated sulphide ore comprises the following specific steps:
a) Crushing raw ore to the granularity of-12 mm (namely the granularity not more than 12 mm), and carrying out wet medium-field magnetic separation on the magnetic separator, wherein the magnetic separator is an external magnetic separator, the rotating speed of a rotary drum is 8-16 revolutions per minute, the gradient is 9-12 ℃, the concentration of ore feeding solids is 30-50%, and the magnetic field strength is 350-450 mT, so as to obtain magnetic concentrate and magnetic tailings;
b) Screening the magnetic concentrate obtained in the step a) by using a vibrating screen, wherein the vibrating screen is a linear vibrating screen, the mesh size is 2mm, so that an oversize product and an undersize product are obtained, and the undersize product enters an iron grinding system of a concentrating mill;
c) Performing high-pressure roller grinding superfine grinding treatment on the vibrating screen oversize product obtained in the step b) by using a high-pressure roller mill, wherein the high-pressure roller mill is a cylindrical pin roller surface, and the pressure of the roller surface of the high-pressure roller mill is 4.5-5.5N/mm 2 Obtaining a high-pressure roller mill ore discharge product;
d) Screening the high-pressure roller mill ore discharge product obtained in the step c) by using a vibrating screen, wherein the vibrating screen is a linear vibrating screen, and the screen holes are 2mm, so that the screen upper and screen lower products of the vibrating screen are obtained;
e) Carrying out dry type weak magnetic separation on the oversize product of the vibrating screen obtained in the step d), wherein the dry type weak magnetic separation uses a dry type belt type magnetic roller, the magnetic field strength is 250-350 mT, the belt speed is 1.25-2.0 m/s, magnetic separation concentrate and magnetic separation tailings are obtained, and the magnetic separation concentrate is mixed with the oversize product obtained in the step b) and then is used as ore feeding of a high-pressure roller mill;
f) Carrying out weak magnetic wet magnetic separation on the undersize product obtained in the step d), wherein the weak magnetic wet magnetic separation uses a wet concurrent drum type magnetic separator, the magnetic field intensity of a drum surface is 250-300 mT, magnetic concentrate and magnetic tailings are obtained, and the magnetic concentrate enters an iron grinding system of a concentrating mill;
g) Screening the magnetic separation tailings in the step f) and the step a) by using a vibrating screen, wherein the vibrating screen is a linear vibrating screen, and the screen holes are 1mm, so that coarse grain on the screen and ore pulp under the screen are obtained; the coarse-grained product on the screen is thrown off, and the ore pulp product under the screen enters a copper-sulfur flotation system 22 to recover chalcopyrite and pyrite.
According to the preselection production system and the preselection production process, wet preselection tailing discarding and high-pressure roller grinding of finely-divided products are carried out, so that the grinding granularity is reduced, the raw ore quantity entering a roller mill is reduced, the grinding grade is improved, associated sulfide ore and waste stone resources are comprehensively utilized, the effects of energy conservation, consumption reduction and synergy are achieved, the associated sulfide ore and waste stone resources are comprehensively recovered, and the efficient and accurate preselection effect is achieved.
Example 3
The magnetite high-efficiency pre-selection process of the associated sulphide ore is processed by using a high-efficiency pre-selection production system, and as shown in fig. 2, the magnetite high-efficiency pre-selection process comprises a finely crushed product bin 1, a pulp making distribution box 3, an external magnetic separator 4 and a linear vibration sieve I5 which are sequentially fed, wherein the finely crushed product in the finely crushed product bin 1 is a finely crushed product with the particle size not more than 12mm, the magnetic system of the external magnetic separator 4 is arranged outside a separation cylinder, after the pulp fed by the pulp making distribution box 3 is separated by the external magnetic separator 4, the magnetic separation tailings enter the linear vibration sieve I5, the magnetic separation concentrate is fed to a linear vibration sieve II 6 and enters a full-closed-circuit high-pressure roller grinding device, and the oversize products of the linear vibration sieve I5 are thrown to be subjected to wet pre-selection tailing so as to reduce the roller grinding amount. The full-closed-circuit high-pressure roller grinding device comprises a second linear vibrating screen 6, a third adhesive tape machine 8, a first buffer bin 9, a variable-frequency feeding adhesive tape machine 10, a pressure stabilizing bearing bucket 11, a high-pressure roller mill 12, a third linear vibrating screen 16, a dry type belt type magnetic roller 17 and a cylindrical magnetic separator 20, wherein the granularity of the oversize product of the second linear vibrating screen 6 is between 12 and 2mm, the oversize product of the second linear vibrating screen 6 is fed to the first buffer bin 9 above the variable-frequency feeding adhesive tape machine 10 through the third adhesive tape machine 8, the head of the variable-frequency feeding adhesive tape machine 10 is in butt joint with the pressure stabilizing bearing bucket 11 of the high-pressure roller mill, the first buffer bin 9 feeds the material in the first buffer bin 9 to the pressure stabilizing bearing bucket 11 above the high-pressure roller mill 12 through the variable-frequency feeding adhesive tape machine 10, the pressure stabilizing bearing bucket 11 feeds to the high-pressure roller mill 12 so as to ensure the stable feeding of the high-pressure roller mill 12, and the undersize pulp of the second linear vibrating screen 6 automatically flows into the magnetite iron selection system 21 through a pipeline, and four-splashing of the slurry is avoided at the same time of recycling; the discharged material of the high-pressure roller mill 12 is fed to a third linear vibrating screen 16, and the undersize product of the third linear vibrating screen 16 is fed to a cylinder magnetic separator 20; concentrate of the barrel magnetic separator 20 enters an iron grinding system 21 to recycle magnetite, and tailings are fed into a linear vibrating screen I5; feeding the undersize product of the first linear vibrating screen 5 into a copper-sulfur grinding flotation system 22 to recycle sulfide ores, wherein the sulfide ores comprise chalcopyrite and pyrite, and the oversize product is thrown into the tail; feeding the oversize products of the third 16 linear vibrating screen into a dry belt type magnetic roller 17; tailings of the dry belt type magnetic roller 17 are thrown off, and concentrate returns to the high-pressure roller mill 12 to form a closed circuit.
In order to improve the length of the whole process and stable and uniform feeding and avoid long-distance material transfer, the finely divided product bin 1 is fed to the pulping distribution box 3 through the first belt conveyor 2; the oversize product of the first linear vibrating screen 5 is subjected to tail throwing through a second belt conveyor 7; tailing of the dry belt type magnetic roller 17 is thrown through a seventh belt conveyor 18; concentrate of the dry belt type magnetic roller 17 is fed to a third 8 of the belt machine through an eighth 19 of the belt machine and returns to the full-closed-circuit high-pressure grinding device; the high-pressure roller mill 12 is fed to a buffer ore bin II 14 through a tape machine V13 below the high-pressure roller mill and passes through each tape machine; the inside of the slurry making distribution box 3 is supplemented with water, and the concentration of the ore pulp after water supplement is 30-45 percent, so that the external magnetic separator 4 can obtain proper feeding concentration. The mesh size of the first linear vibrating screen 5 is 1mm; the mesh sizes of the second linear vibrating screen 6 and the third linear vibrating screen 16 are 2mm. The gravity sensor is arranged in the pressure-stabilizing bucket 11, the ore material level height in the pressure-stabilizing bucket 11 and the variable frequency feeding belt conveyor 10 control the ore feeding speed through the gravity sensor and the speed regulating belt, and the stable material level in the pressure-stabilizing bucket is ensured.
According to the magnetite efficient preselection process of the associated sulphide ores, TFe grade of raw ores is 30-40%, mFe 25.8.8-35.0%, cu 0.02-0.09% and S1.5-3.2%, as shown in FIG. 1, the method comprises the following specific steps:
a) Crushing raw ore to the granularity of-12 mm, and carrying out wet medium-field magnetic separation on the raw ore by using an external magnetic separator 4, wherein the rotating speed of a rotary drum is 8-16 revolutions per minute, the gradient is 9-12 ℃, the concentration of ore-feeding solid is 30-50%, and the magnetic field strength is 350-450 mT, so as to obtain magnetic concentrate and magnetic tailings;
b) Screening the magnetic concentrate obtained in the step a) by using a vibrating screen, wherein the vibrating screen is a linear vibrating screen II 6, the mesh size is 2mm, so as to obtain an oversize product and an undersize product, and the undersize product enters an iron grinding and selecting system 21 of a concentrating mill;
c) Performing high-pressure roller grinding superfine grinding treatment on the vibrating screen oversize product obtained in the step b) by using a high-pressure roller mill 12, wherein the high-pressure roller mill 12 is a column nail roller surface, and the pressure of the high-pressure roller mill roller surface is 4.5-5.5N/mm 2 Obtaining a high-pressure roller mill ore discharge product;
d) Screening the high-pressure roller mill ore discharge product obtained in the step c) by using a vibrating screen, wherein the vibrating screen is a linear vibrating screen III 16, and the screen holes are 2mm, so that the on-screen and under-screen products of the vibrating screen are obtained;
e) Carrying out dry type weak magnetic separation on the oversize product of the vibrating screen obtained in the step d), wherein the dry type weak magnetic separation uses a dry type belt type magnetic roller 17, the magnetic field strength is 250-350 mT, the belt speed is 1.25-2.0 m/s, magnetic separation concentrate and magnetic separation tailings are obtained, and the magnetic separation concentrate is mixed with the oversize product obtained in the step b) and then is used as ore feeding of a high-pressure roller mill 12;
f) Carrying out weak magnetic wet magnetic separation on the undersize product obtained in the step d), wherein the weak magnetic wet magnetic separation uses a wet forward-flow type drum-type magnetic separator 20, the drum surface magnetic field strength is 250-300 mT, magnetic concentrate and magnetic tailings are obtained, and the magnetic concentrate enters an iron grinding system of a concentrating mill;
g) Screening the magnetic separation tailings in the step f) and the step a) by using a vibrating screen, wherein the vibrating screen is a linear vibrating screen I5, and the screen holes are 1mm, so as to obtain coarse grain products on the screen and ore pulp products under the screen; the coarse-grained product on the screen is thrown off, and the ore pulp product under the screen enters a copper-sulfur flotation system 22 to recover chalcopyrite and pyrite.
The magnetite high-efficiency pre-selection system and the magnetite high-efficiency pre-selection process for the associated sulphide ores are used for carrying out wet magnetic separation on finely crushed products of-12 mm, so that the yield of subsequent operation is reduced to the greatest extent through tail discarding, the equipment model specification is reduced, and investment and cost are reduced; because the concentrate concentration of the magnetic concentrate products is lower than 12mm, the moisture content is high, the magnetic concentrate products cannot directly enter a high-pressure roller mill, the magnetic concentrate products are sieved by a linear vibrating screen, the moisture of the products with the size of 12-2 mm on the screen is controlled to be less than 6%, the requirements of entering the high-pressure roller mill are met, the granularity of the products under the screen is controlled to be less than 2mm, and the products directly enter a subsequent ore grinding system, so that the load of the high-pressure roller mill is also reduced; the full-closed high-pressure roller grinding process of 12-2 mm high-pressure roller grinding, 2mm wet screening, on-screen dry separation, undersize wet separation and tailing discarding is adopted, so that the purposes of more grinding, less grinding, early polishing and energy saving and consumption reduction are realized; the roller mill product is subjected to screening and grading magnetic separation, products with different particle sizes are treated by adopting different magnetic separation equipment, the tailing discarding effect is good, and the recovery rate of iron is high. The product under the screen of the high-pressure roller mill is subjected to roller milling of the high-pressure roller mill, so that the grindability is improved, and the energy conservation and consumption reduction of the ore milling system are facilitated.
Example 4
The basic structure of the magnetite efficient preselection system and the magnetite efficient preselection process of associated sulphide ores in the embodiment are the same as those in the embodiment 3, and the main industrial metal minerals in the applicable iron ores are magnetite, contain a small amount of hematite and specularite, and the associated minerals which can be comprehensively recovered are mainly pyrite and chalcopyrite; the gangue minerals mainly comprise quartz, feldspar, chlorite, diopside, tremolite, actinolite and the like, and as shown in figure 2, the gangue minerals comprise a finely divided product bin 1 with the diameter of-12 mm, a first belt conveyor 2, a slurry making distribution box 3, an external magnetic separator 4, a first linear vibrating screen 5, a second linear vibrating screen 6, a second belt conveyor 7, a third belt conveyor 8, a buffer bin 9 with the diameter of-12+2 mm for feeding materials (-12+2 mm, namely the granularity is 2-12 mm), a variable frequency feeding belt conveyor 10, a hopper bin 11, a high pressure roller mill 12, a fifth belt conveyor 13, a second buffer bin 14, a sixth belt conveyor 15, a third linear vibrating screen 16, a dry belt type magnetic roller 17, a seventh belt conveyor 18, a eighth belt conveyor 19 and a barrel type magnetic separator 20.
Raw ore with the grade of TFe of 35.14%, mFe 30.05.05%, cu0.046% and S1.9% for storing crushed products of-12 mm is firstly fed into a pulp making distribution box 3 through a feeding belt machine I2 with variable frequency speed regulation, and water is added into the pulp making distribution box 3, so that the pulp concentration is 30-45%. The ore after pulping enters an external magnetic concentrating machine 4, after separation, the magnetic separation tailings enter a linear vibrating screen I5, the oversize products are conveyed to a storage yard through a belt conveyor to be sold as building material products, and the undersize products enter a copper-sulfur flotation system 22 of a concentrating plant to recycle sulfide ores, including chalcopyrite and pyrite.
Concentrate of the external magnetic separator 4 is fed into the ore feeding end of the second linear vibrating screen 6, ore pulp of the concentrate under the screen of the second linear vibrating screen 6 automatically flows into the first-stage iron grinding and separating system 21 through a pipeline for magnetite grinding and separating, and magnetite is recovered;
the oversize material of the linear vibrating screen II 6 is fed into a buffer ore bin I9 of a high-pressure roller mill 12 through a belt conveyor III 8, a variable-frequency feeding belt conveyor 10 is arranged at the lower part of the buffer ore bin I9, and the material in the buffer ore bin I9 is fed into a pressure stabilizing bearing bucket 11 of the high-pressure roller mill. The pressure stabilizing bearing bucket 11 is arranged above the two compression roller gaps of the high-pressure roller mill 12 and is used as a hopper for stabilizing ore feeding of the high-pressure roller mill 12; the ore is conveyed to a buffer bin II 14 by a belt conveyor III 13 of which the discharge of the high-pressure roller mill 12 falls below, the ore is fed to a linear vibrating screen III 16 by a feeding belt conveyor III 15, the undersize product of the linear vibrating screen III 16 is fed to a cylinder magnetic separator 20, the oversize product of the linear vibrating screen III 16 is fed to a dry belt type magnetic roller 17, tailings of the dry belt type magnetic roller 17 are sold as building material products, concentrate of the dry belt type magnetic roller 17 is conveyed to a belt conveyor III 8 by a belt conveyor V19, and the concentrate is fed to a buffer bin I9 by the belt conveyor III 8 to form a closed circuit.
The hydraulic gate valve is arranged at the lower discharge port of the fine crushing product bin 1, the first buffer bin 9, the pressure stabilizing hopper 11 and the second buffer bin 14, and can be used for controlling the size of the discharge port. The pulp concentration of the pulp after water is added into the pulp distribution box 3 is 30-45%. The rotating speed of the rotary drum of the external magnetic concentrating machine 4 is 12 revolutions per minute, the gradient is 10 degrees, the concentration of ore feeding solid is 40 percent, and the magnetic field strength is 400mT. The high-pressure roller mill 12 is a cylindrical nail roller surface, the feeding is required to be fully extruded, and the pressure of the roller surface of the high-pressure roller mill is 5.0N/mm 2 。
A first linear vibrating screen 5, wherein the screen hole size is 1mm; the second linear vibrating screen 6 and the third linear vibrating screen 16 have a screen hole size of 2mm. The gravity sensor is arranged on the pressure-stabilizing bearing bucket 11, the motor of the belt conveyor 10 is used for variable frequency speed regulation, the ore material level height in the pressure-stabilizing bearing bucket 11 and the variable frequency feeding belt conveyor 10 control the ore feeding speed through the gravity sensor and the speed regulating belt, and the stable material level in the pressure-stabilizing bearing bucket is ensured. The dry belt type magnetic roller 17 is a dry permanent magnetic roller magnetic separator, the magnetic field intensity of the roller surface is 300mT, and the belt speed is 1.6m/s; the drum magnetic separator 20 is a wet concurrent drum magnetic separator, and the magnetic field intensity of the drum surface is 280mT.
The method comprises the following specific steps:
a) Crushing raw ore to the granularity of-12 mm, and carrying out wet medium-field magnetic separation on the raw ore by an external magnetic separator 4, wherein the equipment model is phi 630 ZCPA, the rotating speed of a rotating drum is 14 revolutions per minute, the gradient is 11 ℃, the concentration of ore-feeding solid is 35%, and the magnetic field strength is 400mT, so as to obtain magnetic separation concentrate and magnetic separation tailings;
b) Screening the magnetic concentrate obtained in the step a) by a second linear vibrating screen (model XSZ-600X 300) with a screen hole size of 2mm to obtain an oversize product and an undersize product, wherein the undersize product enters an iron grinding system 21 of a concentrating mill;
c) On-screen production of the vibrating screen obtained in step b)The product is subjected to high-pressure roller grinding superfine grinding treatment of a high-pressure roller mill 12, the high-pressure roller mill 12 is a column nail roller surface, the high-pressure roller mill 12 model GLGY0825 (roller diameter 800mm, width 250 mm) and the high-pressure roller mill roller surface pressure is 5.0N/mm 2 The rotating speed of the press roller is 0.335m/s, and the high-pressure roller mill ore discharge product is obtained;
d) Screening the high-pressure roller mill ore discharge product obtained in the step c) by a linear vibrating screen III 16, wherein the model is XSZ-600X300, and the screen holes are 2mm, so as to obtain the on-screen and under-screen products of the vibrating screen;
e) Carrying out dry type weak magnetic separation on the oversize product obtained in the step d) by using a dry type belt type magnetic roller 17, wherein the model is CTL0810, the roller diameter is 750mm, the magnetic field strength is 350mT, the belt speed is 1.25m/s, magnetic separation concentrate and magnetic separation tailings are obtained, and the magnetic separation concentrate is mixed with the oversize product obtained in the step b) and then used as ore feeding of a high-pressure roller mill 12;
f) Carrying out weak magnetic wet magnetic separation on the undersize product obtained in the step d) by using a drum type magnetic separator 20, wherein the weak magnetic wet magnetic separation uses a wet forward flow type drum type magnetic separator 20, the model is CCT9010, the drum surface magnetic field strength is 300mT, magnetic separation concentrate and magnetic separation tailings are obtained, and the magnetic separation concentrate enters an iron grinding system 21 of a concentrating mill;
g) Screening the magnetic separation tailings in the step f) and the step a) by a linear vibrating screen I5, wherein the model is XSZ-600X300, and the screen holes are 1mm, so as to obtain an on-screen coarse grain product and an under-screen ore pulp product; the coarse-grained product is sold as a building material product and the undersize pulp product is fed to a copper-sulfur flotation system 22 for recovery of chalcopyrite and pyrite.
Through detection, the yield of the iron entering the iron grinding and selecting system 21 is 66.38%, the iron grade is 48.02%, the iron grade is improved by 12.88%, and the effects of energy conservation and cost reduction are achieved through tail-discarding and quality improvement; the granularity of the raw ore entering the subsequent ball mill after the pre-selection treatment is reduced from-12 mm to-2 mm, and the aim of saving the ore grinding cost is achieved by reducing the granularity. The yield of tailings sold as building materials is 18.68%, the contents of sulfur element and copper element are low, and the sales income of the products as building materials is far higher than the benefit of recycling copper and sulfur element into a selection factory; the yield of the magnetic separation tailings, namely 1mm, is 15.55%, the content of copper element and sulfur element is high, and the tailings enter a copper-sulfur flotation system 22 to realize recovery.
The magnetite high-efficiency pre-selection system and the magnetite high-efficiency pre-selection process for the associated sulphide ores can carry out 1mm screening classification on the-2 mm magnetic separation tailings according to the granularity characteristic that the fine particle size distribution of the sulphide ores in the tailings is high, the content of the sulphide ores on the screen is low, and the magnetite high-efficiency pre-selection system and the magnetite high-efficiency pre-selection process are sold as building materials, so that the ore quantity of subsequent operations is reduced, and the purposes of reducing cost and enhancing efficiency are achieved; the content of sulfide ore of the undersize product is higher, and the undersize product enters a sulfide ore grinding and selecting system to comprehensively recover chalcopyrite and pyrite, thereby comprehensively recovering the sulfide ore.
The examples of the present invention are merely for describing the preferred embodiments of the present invention, and are not intended to limit the spirit and scope of the present invention, and those skilled in the art should make various changes and modifications to the technical solution of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A magnetite high-efficiency preselection process of associated sulphide ores is characterized in that: the full closed-circuit high-pressure roller grinding process comprises the steps of carrying out high-pressure roller grinding treatment on crushed raw ore with the granularity of 12-2 mm by a high-pressure roller mill, carrying out wet screening, carrying out dry separation treatment on screened oversize products by a dry type belt type magnetic roller, carrying out wet separation and tail discarding treatment on undersize products by a drum type magnetic separator, and returning concentrate after the dry separation treatment to the high-pressure roller mill to form a closed circuit.
2. The magnetite efficient preselection process for associated sulphide ores according to claim 1, wherein: the method comprises the following specific steps:
a) Crushing raw ore to the granularity of-12 mm, and carrying out wet medium-field magnetic separation on the raw ore by a magnetic separator to obtain magnetic concentrate and magnetic tailings;
b) Screening the magnetic concentrate obtained in the step a) by using a vibrating screen to obtain an oversize product and an undersize product, wherein the undersize product enters an iron grinding system of a concentrating mill;
c) Performing high-pressure roller grinding superfine grinding treatment on the vibrating screen oversize product obtained in the step b) to obtain a high-pressure roller grinding ore discharge product;
d) Screening the high-pressure roller mill ore discharge product obtained in the step c) by a vibrating screen to obtain an on-screen product and an under-screen product of the vibrating screen;
e) Carrying out dry type weak magnetic separation on the oversize product obtained in the step d) to obtain magnetic concentrate and magnetic tailings, and mixing the magnetic concentrate with the oversize product obtained in the step b) to serve as ore feeding of a high-pressure roller mill;
f) Carrying out weak magnetic wet magnetic separation on the undersize product obtained in the step d) to obtain magnetic concentrate and magnetic tailings, wherein the magnetic concentrate enters an iron grinding system of a concentrating mill;
g) Screening the magnetic separation tailings in the step f) and the step a) by a vibrating screen to obtain an on-screen coarse grain product and an undersize ore pulp product; and (5) throwing the coarse grain product on the screen into a tail, and enabling the ore pulp product under the screen to enter a copper-sulfur flotation system.
3. The magnetite efficient preselection process for associated sulphide ores according to claim 2, wherein: TFe grade of the raw ore is 30-40%, mFe 25.8.8-35.0%, cu is 0.02-0.09%, and S is 1.5-3.2%.
4. A magnetite efficient preselection process for associated sulphide ores according to claim 3, wherein: the magnetic separator in the step a) is an external magnetic separator, the rotating speed of the rotary drum is 8-16 revolutions per minute, the gradient is 9-12 ℃, the concentration of ore-feeding solids is 30-50%, and the magnetic field strength is 350-450 mT.
5. A magnetite efficient preselection process for associated sulphide ores according to claim 3, wherein: in the step b), the vibrating screen is a linear vibrating screen, and the mesh size is 2mm.
6. The magnetite efficient preselection process for associated sulphide ores according to claim 4, wherein: in the step c), the high-pressure roller mill is a cylindrical pin roller surface, and the pressure of the roller surface of the high-pressure roller mill is 4.5-5.5N/mm 2 。
7. The magnetite efficient preselection process for associated sulphide ores according to claim 5, wherein: in the step e), dry type magnetic field weakening and separation are performed by using a dry type belt type magnetic roller, wherein the magnetic field strength is 250-350 mT, and the belt speed is 1.25-2.0 m/s.
8. The magnetite efficient preselection process for associated sulphide ores according to claim 7, wherein: in the step f), the weak magnetic wet magnetic separation uses a wet forward-flow type drum magnetic separator, and the magnetic field intensity of the drum surface is 250-300 mT.
9. The magnetite efficient preselection process for associated sulphide ores according to any of claims 2 to 8, wherein: in the step g), the vibrating screen is a linear vibrating screen, and the screen holes are 1mm.
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