CN115382662B - Waste-free comprehensive utilization process and system for ultra-lean magnetite resources - Google Patents
Waste-free comprehensive utilization process and system for ultra-lean magnetite resources Download PDFInfo
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- CN115382662B CN115382662B CN202211330652.2A CN202211330652A CN115382662B CN 115382662 B CN115382662 B CN 115382662B CN 202211330652 A CN202211330652 A CN 202211330652A CN 115382662 B CN115382662 B CN 115382662B
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Abstract
The invention relates to the technical field of comprehensive utilization, energy conservation, emission reduction and circular economy of ore resources, in particular to a waste-free comprehensive utilization process and a waste-free comprehensive utilization system for super-lean magnetite resources, wherein coarse-grained ores are subjected to dry magnetic separation, the recovery rate of dry-separated concentrate is improved, the loss of metal quantity is reduced, and the high-efficiency recovery of resources is realized; in the stage, gangue minerals can be removed by 60-70%, so that the subsequent operation treatment capacity is greatly reduced, and the energy consumption is reduced; performing wet low-intensity magnetic separation on fine-fraction ores, thereby realizing early recovery and enrichment of iron ore resources and improving the grade of concentrate; the subsequent dry separation rough concentrate II is finely crushed by a re-crushing machine, the grinding granularity of the ball mill is reduced, and the qualified ore grinding fineness can be realized through a section of ball milling operation; the ore after re-crushing operation and the rough concentrate I are subjected to wet pre-selection together, 20% -30% of gangue minerals are further removed, the grinding amount of a ball mill is further reduced, the ore grinding efficiency is improved, the energy consumption is reduced, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of ore resources, energy conservation, emission reduction and circular economy, in particular to a process and a system for waste-free comprehensive utilization of ultra-lean magnetite resources.
Background
The magnetic iron content of the ultra-lean magnetite ore is lower than that of the magnetic iron ore of the existing iron ore needing to be sorted, the ore grade is low, the ore dressing ratio is small, in the development and utilization processes, the discharge amount of waste rocks and tailings is large, the mining and utilization cost is high, the ore dressing is difficult to carry out economically, and meanwhile, a tailing pond and a refuse dump cause huge pressure on production safety and ecological environment.
Therefore, the comprehensive utilization of ore resources and the improvement of the comprehensive development value are imperative. In recent years, a great deal of research on comprehensive utilization of iron ore resources is carried out at home and abroad, such as production of building materials, filling, land making and the like by using waste rocks and tailings, and the problems of ecological environment and geological safety are solved, but the problems of industrial lag and large cost investment exist.
The natural sandstone aggregate is a non-renewable resource, and through excessive and disordered mining for decades, more than half of areas in China have the condition of resource shortage of the natural sandstone aggregate, even the natural sandstone in areas rich in the raw sandstone resource is greatly reduced and even nearly exhausted, and a plurality of problems and hidden dangers of river and lake ecological environment damage, embankment bridge collapse, channel damage and the like are caused. In recent years, governments at all levels continuously increase the supervision on natural sandstone exploitation, and the policy of forbidding river sand exploitation is brought out from many places, so that the development of mechanism sand is encouraged and supported.
The ultra-lean magnetite ore in China is rich in resources, along with rapid economic development, a large amount of iron ore resources are developed, the ore resources are not efficiently and comprehensively utilized, so that waste rocks are accumulated into mountains, a tailing pond occupies a large amount of land, farmland vegetation is damaged, land pollution and water resource pollution are caused, a large amount of capital is invested for safety maintenance every year for governments and enterprises, and hidden dangers are caused to the life and property safety of surrounding residents.
Under the background, the invention is particularly provided by combining the difficulties of ore resource development and utilization and the problems of ecological environment, and taking a way of changing waste into valuable, comprehensively utilizing resources and recycling economy to realize the concept of 'green water green mountain, namely Jin Shanyin mountain'.
Disclosure of Invention
In order to solve the technical problems, the invention provides a process and a system for the waste-free comprehensive utilization of ultra-lean magnetite resources, which realize the enrichment of low-grade iron ores to high-grade iron ore resources, and carry out wet magnetic separation and dry magnetic separation on fine-grained ores and coarse-grained ores according to the principles of early throwing, early grading and early enrichment of gangue minerals, and the high-pressure roller grinding and fine crushing of coarse concentrate reduce the grinding amount of ores and the grinding granularity of the ores, and solve the problems of large abrasion, high cost and large water consumption.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a waste-free comprehensive utilization process of an ultra-lean magnetite resource, which comprises the following steps:
s1, pre-screening raw ores of the super-lean magnetic iron ores, crushing the raw ores through a closed circuit, grading the ores according to the requirement of preset granularity, and returning the ores with the granularity of more than 30mm to perform secondary crushing; coarse and fine ores with the grain sizes of 30 mm-5 mm and minus 5mm are used as screening products;
s2, performing wet type low-intensity magnetic separation on ores with the sizes of minus 5mm to obtain rough concentrate I, and performing sand washing and grading operation on wet type low-intensity magnetic separation tailings to obtain building sand with different size grades; carrying out dry separation and strong magnetic separation on the ore with the particle size of 30-5 mm to obtain dry separation rough concentrate II, and screening and grading the discarded dry separation tailings to obtain building aggregate with different particle size grades;
s3, feeding the rough concentrate II into a re-crushing machine for crushing, and performing wet pre-magnetic separation on the rough concentrate II and the rough concentrate I together through inspection and screening; feeding the pre-magnetic tailings into a sand washing machine to perform sand washing and screening operation;
s4, carrying out classification operation on the wet-type pre-magnetic concentrate through a cyclone, feeding settled sand into a first-stage ball mill for grinding, and feeding overflow into a high-frequency fine sieve for classification;
s5, feeding the primary grinding ore discharge into wet type low-intensity magnetic separation equipment B for magnetic separation, and returning magnetic concentrate to the cyclone in the step S4 for classification to form a closed circuit; magnetically separating the product under the high-frequency fine sieve by at least one wet type low-intensity magnetic separation device C, concentrating and magnetically separating the magnetic concentrate by a concentration magnetic separator, and filtering the magnetic concentrate by a disc filter to generate a final iron concentrate product; and feeding the tailings subjected to wet pre-magnetic separation, the tailings subjected to wet low-intensity magnetic separation equipment B and the tailings subjected to wet low-intensity magnetic separation equipment C into a sand washing machine for sand washing, screening and filter pressing to obtain building sand and stone powder.
The ultra-lean magnetite ore refers to iron ore which has the total iron grade of 10-20% and the magnetic iron grade of more than or equal to 5% and can be developed and utilized and has profit under the current technical and economic conditions. In the prior art, the ultra-lean magnetite ore dressing process adopts crushing-grinding-magnetic separation, and mainly adopts two-section crushing, two-section grinding and three-section or four-section magnetic separation processes, wherein the energy consumption of crushing and grinding accounts for more than 50% of the whole ore dressing plant, and the energy consumption of grinding accounts for more than 70% of the whole crushing and grinding operation. The ultra-lean magnetic iron ore has low grade of raw ore, and high-grade ore is more enriched in fine-grained ore, which is different from the conventional crushed product full-grain dry separation waste disposal process; in the stage, gangue minerals can be removed by 60-70%, so that the subsequent operation treatment capacity is greatly reduced, and the energy consumption is reduced; due to the limitation of the separation principle of dry magnetic separation equipment, the dry magnetic pulley is poor in effect under the condition of high fine granularity and high humidity; the yield of dry magnetic separation tailings discarding is 10-15%, the grade is improved by less than 2%, the loss of tailings magnet is 1.5%, and the part is as high as 3.6%, in the invention, wet-type low-intensity magnetic separation is carried out on fine-fraction ore, so that the early recovery and enrichment of iron ore resources are realized, the energy consumption is reduced, and the grade of concentrate is improved; the subsequent dry separation rough concentrate II is finely crushed by a re-crushing machine, the grinding granularity of the ball mill is reduced, and the qualified ore grinding fineness can be realized through a section of ball milling operation; the ore after re-crushing operation and the rough concentrate I are subjected to wet pre-separation together, 20% -30% of gangue minerals are further removed, the grinding amount of the ball mill is further reduced, the ore grinding efficiency is improved, the energy consumption is reduced, and the cost is reduced.
In the aspect of comprehensive utilization of resources, because the quality standard requirements of sand and stone used in industries such as buildings, highways, metallurgy and the like are different, the conventional process for producing the machine-made sandstone by utilizing the ore waste stone tailings has poor granularity grading of products and low crushing strength, and limits the application range. The process strictly controls classification, and a pre-enrichment stage, the wet tailings and the dry waste rocks are respectively processed into building sand, stone powder and building aggregate with different granularity specifications, so that the secondary utilization of tailings and waste rock resources is realized while the value of ore resources is extracted, the machine-made sandstone aggregate meeting the standard is produced, the tailings which are crushed by a re-crushing machine and subjected to ore grinding operation are changed into valuable, and the different requirements of industries such as buildings, roads, municipal administration and the like on high-grade building sandstone are met; the ore after the follow-up rough concentrate is crushed by a re-crushing machine and ground by a ball mill enters sand washing operation, and the construction sand quality is not suitable for high-grade concrete due to the self strength defect, and can be used in low-strength concrete to reduce the concrete cost differentially.
In the aspect of ecological environment protection, because the ore dressing ratio of the ultra-lean magnetite ore is very high, about 10t of waste rocks and tailings are usually discharged when 1t of iron ore concentrate is produced, and the environment problem can be caused by improper treatment of a large amount of tailings; the production water is completely recycled as return water except for taking away part of water from the product, a tailing pond and a waste dump do not need to be built, potential safety hazards and environmental pollution approaches of the tailing pond and the waste dump are blocked from the source, and the ecological benefit is obvious.
The aggregate is a granular loose material which plays a role of framework or filling in concrete and can be divided into coarse aggregate with the grain diameter of 5-40 mm and fine aggregate with the grain diameter of less than 5mm according to the grain diameter. The tailings of the coarse ore obtained by pre-screening through dry separation and strong magnetic separation are screened and graded to obtain aggregates with different particle size grades, the coarse ore concentrate II is subjected to subsequent re-crushing and mechanical crushing after the dry separation and strong magnetic separation, the fine ore is subjected to wet type weak magnetic separation to improve the grade of the magnetite, and in order to improve the crushing efficiency and the mineral separation efficiency of the re-crushing and mechanical crushing, the particle size of the coarse ore is selected to be 30-5 mm, and the particle size of the fine ore is selected to be less than-5 mm.
The technical scheme of the invention is mainly provided for the ultra-lean magnetite ore with the granularity of the raw ore below-500 mm, the closed-circuit crushing is preferably performed by coarse crushing and then intermediate crushing, the intermediate crushed product is screened, and the ore with the granularity of more than 30mm returns to the two-stage one-closed-circuit crushing of the intermediate crushing again; coarse crushing is set as an open circuit, namely, the coarse crushing is not circulated; the coarse crushing ore discharge opening is set to be about 150mm, and the particle size of the medium crushing product is below 30 mm; for the magnetite ore with the raw ore granularity of more than 500mm, the one-section crushing operation can be added, namely, the magnetite ore is subjected to coarse crushing, intermediate crushing and then fine crushing, the fine crushed product is screened, and the magnetite ore with the granularity of more than 30mm returns to the three-section one-closed-circuit crushing for fine crushing again.
The pre-screening is to screen the raw magnetite ore by adopting screening equipment, only oversize products are coarsely crushed, and the processing amount of coarse crushing operation is reduced; carrying out medium crushing on the coarse crushed product and the undersize product; the middle crushing operation and the screening operation form a closed cycle, so that the inspection and screening are realized, and the qualified product granularity is ensured.
In the step S2, carrying out sand washing operation on the wet low-intensity magnetic separation tailings, and fishing out 5-3 mm of construction sand I after dehydration and screening; grading the rest ore by using a cyclone to obtain 3-0.15 mm settled sand, and dehydrating and screening to obtain building sand II; concentrating overflow products with the diameter of less than 0.15mm in the classifying operation of the cyclone, and performing filter pressing on the concentrated products to obtain product stone powder; the building sand I, the building sand II and the stone powder are fine aggregates with different granularity levels; the return water in the processes of dehydration, screening, concentration and filter pressing can be recycled.
In the step S2, the discarded dry tailings are screened and classified to obtain building aggregates (stones) I with the size of 30-20 mm, building aggregates (stones) II with the size of 20-10 mm and building aggregates (stones) III with the size of 10-5 mm, wherein the building aggregates with the three specifications are coarse aggregates with different granularity levels.
In the step S2, the rough concentrate I enters a fine ore bin to ensure the synchronization and the continuity with the downstream deep magnetic separation operation; the rough concentrate II enters a pre-crushing ore bin to ensure the continuity of subsequent operation;
in the step S3, the rough concentrate II is sent into a re-crushing machine for crushing, and is inspected and sieved by sieving equipment, and the particle size of undersize discharged materials is controlled to be below 5 mm; the oversize mineral aggregate and the recrushing machine form a closed circuit; the coarse concentrate II is crushed to be less than 5mm by the re-crushing machine, so that the grinding fineness is reduced to a greater extent, and the subsequent ore grinding efficiency is improved.
In the step S4 and the step S5, the pre-magnetic separation concentrate is graded by the cyclone, and overflow does not need to enter ore grinding operation, so that the ore grinding processing amount is further reduced; the wet-type pre-magnetic separation concentrate is subjected to two-stage grading and one-stage grinding closed-circuit operation, the qualified grinding fineness of the ore is guaranteed to be 70-85% of 200 meshes, and the concentrate grade is favorably improved.
Preferably, in the step S5, the undersize product of the high-frequency fine sieve is subjected to magnetic separation by the wet low-intensity magnetic separation device C twice, specifically, the undersize product of the high-frequency fine sieve is fed into the wet low-intensity magnetic separator C for magnetic separation, and the oversize product returns to the cyclone in the step S4 for classification to form a closed cycle; feeding the primary magnetic concentrate into a secondary wet-type low-intensity magnetic separator C for magnetic separation, and feeding magnetic tailings into a sand washing machine for sand washing operation; and feeding the secondary magnetic concentrate into a concentration magnetic separator for concentration and magnetic separation, and feeding the magnetic tailings into a sand washing machine for sand washing operation.
In the step S5, tailings of the wet-type pre-magnetic separation device B and the wet-type low-intensity magnetic separation device C are fed into a sand washer to be washed, the building sand III with the granularity of 5 mm-0.15 mm on the screen is obtained by screening through a dewatering screen, and a stone powder product with the granularity of 0.15 mm-0 mm is obtained by concentrating and filter-pressing the product below the screen; the return water in the processes of dehydration screening, concentration and filter pressing can be recycled.
The invention provides a waste-free comprehensive utilization system of super-lean magnetite resources, which is realized according to the waste-free comprehensive utilization process of the super-lean magnetite resources and comprises pre-screening equipment, crushing equipment, screening equipment I, wet type weak magnetic separation equipment A, sand washing equipment I, dry type strong magnetic separation equipment, screening equipment II, re-crushing machinery, pre-magnetic separation equipment and a section of ball mill, wherein the pre-screening equipment is used for pre-screening the super-lean magnetite raw ores and is arranged at the upstream of the crushing equipment; the screening equipment I is used for grading the ore subjected to closed circuit crushing and is arranged at the downstream of the crushing equipment; the wet type low-intensity magnetic separation equipment A, the sand washing equipment I, the dry type high-intensity magnetic separation equipment and the screening equipment II are respectively arranged at the downstream of the screening equipment I, and the screening equipment II is used for screening and grading the dry type tailings; a re-crushing front ore bin for storing coarse concentrate II is arranged at the downstream of the dry separation strong magnetic separation equipment, a re-crushing machine is simultaneously arranged at the downstream of the wet type weak magnetic separation equipment A and the re-crushing front ore bin, a discharge port of the re-crushing machine is connected with a feed port of a screening equipment III, a screen lower outlet of the screening equipment III is connected with pre-magnetic separation equipment, and a screen upper outlet is connected with a feed port of the re-crushing machine; a cyclone II and sand washing equipment II are arranged at the downstream of the pre-magnetic separation equipment; a section of ball mill and a high-frequency fine screen are arranged at the downstream of the cyclone II; the downstream of one section ball mill arranges wet-type low intensity magnetic separation equipment B, the downstream of high frequency fine screen has arranged wet-type low intensity magnetic separation equipment C once at least, the concentrate exit linkage of wet-type low intensity magnetic separation equipment C concentrates the pan feeding mouth of magnet separator, the pan feeding mouth of disk filter is connected to the discharge gate of concentrated magnet separator, the tailings export of premagnetization equipment, wet-type low intensity magnetic separation equipment B and wet-type low intensity magnetic separation equipment C all connects the pan feeding mouth of sand washing equipment II, the discharge gate of sand washing equipment II connects dewatering screening equipment, dewatering screening equipment's undersize export connects gradually concentrator and filter pressing equipment.
In a possible technical scheme, the crushing equipment comprises coarse crushing equipment and intermediate crushing equipment, and a discharge port of the coarse crushing equipment is connected with a feed port of the intermediate crushing equipment.
In one possible technical solution, the coarse crushing device is a jaw crusher; the middle crushing equipment is a cone crusher.
In one possible technical scheme, a vibrating bar feeder is selected by a pre-screening device; and the screening equipment I selects a double-layer banana screen.
In a possible technical scheme, a fine ore bin is arranged at the downstream of the wet low-intensity magnetic separation equipment A, so that the synchronization and the continuity of the downstream deep magnetic separation operation are ensured.
In one possible technical scheme, the sand washing equipment I comprises a wheel bucket sand washing machine, a linear vibration dewatering screen I, a cyclone I, a high-efficiency thickener and a belt filter press, wherein a discharge port of the wheel bucket sand washing machine is connected with a feed port of the linear vibration dewatering screen I, a screen outlet of the linear vibration dewatering screen I is connected with a feed port of the cyclone I, a sand settling port of the cyclone I is connected with a linear vibration dewatering screen II, an overflow port is connected with a feed port of the high-efficiency thickener, and a discharge port of the high-efficiency thickener is connected with a feed port of the belt filter press; the high-efficiency thickener is used for concentrating overflow products with the thickness of less than 0.15mm in the classifying operation of the cyclone, and the belt filter press is used for carrying out filter pressing on the concentrated products.
In a possible technical scheme, a CT type permanent magnetic roller is selected by a dry separation strong magnetic separation device; the screening equipment II selects a double-layer linear vibrating screen; selecting a high-pressure roller mill by a re-crushing machine; selecting a double-layer linear vibrating screen by the screening equipment III; the first-stage ball mill is an overflow ball mill, and the concentration of ore pulp is controlled to be 70-85%; selecting a wheel bucket type sand washer by the sand washing equipment II; the dewatering and screening equipment selects a linear vibration dewatering screen; the concentration equipment selects a high-efficiency thickener; the filter pressing equipment is a belt filter press.
In one possible technical scheme, the wet type weak magnetic separation equipment A and the pre-magnetic separation equipment are both concurrent wet type cylinder permanent magnetic separators; and the wet type low-intensity magnetic separation equipment B and the wet type low-intensity magnetic separation equipment C are both semi-counter current type wet type barrel low-intensity magnetic separators.
The ultra-lean magnetite resource waste-free comprehensive utilization system can be adjusted in applicability according to production scale, raw ore property and product quality requirements, such as the number of devices, the processing capacity and the installation angle, so as to meet the actual production requirements, and therefore the system has strong universality.
Compared with the prior art, the invention has the beneficial effects that: firstly, the invention realizes the development and utilization of the ultra-lean magnetite ore resources with low cost, low energy consumption and low water consumption; secondly, the invention realizes resource utilization of tailings and waste rocks, saves energy, reduces emission, realizes zero discharge of solid waste, solves the problems of environmental pollution and geological disasters caused by tailings reservoirs and waste dumps at the source, and reduces the cost of waste discharge and safety maintenance of enterprises; thirdly, the tailings and the waste rocks are recycled, so that waste is changed into valuable, the dilemma of the shortage of supply and demand of regional natural gravels is broken, and the society is benefited while the income is created for production enterprises; the application of the invention is an effective way for manufacturing 'green mines' by manufacturing enterprises, and is the practice of 'green water green mountains, namely Jin Shanyin mountains'.
Drawings
FIG. 1 is a flow chart of the process for the waste-free comprehensive utilization of the ultra-lean magnetite resource of the invention;
FIG. 2 is a schematic structural diagram of a waste-free comprehensive utilization system for ultra-lean magnetite resources, according to the present invention;
FIG. 3 is a schematic view of the connection structure of the sand washing equipment I;
reference numerals: 100-pre-screening equipment; 200-a crushing device; 210-coarse crushing equipment; 220-medium crushing equipment; 300-screening equipment I; 400-wet type weak magnetic separation equipment A; 500-sand washing equipment I; 510-wheel bucket sand washer; 520-linear vibration dewatering screen I; 530-swirler I; 540-high efficiency thickener; 550-belt filter press; 560-straight vibrating dewatering screen II; 600-dry separation strong magnetic separation equipment; 700-screening device II; 800-re-crushing the pre-ore bin; 900-a re-crushing machine; 1000-screening device III; 1100-pre-magnetic separation equipment; 1200-swirler ii; 1300-first stage ball mill; 1400-high frequency fine screening; 1500-wet type weak magnetic separation equipment B; 1600-primary wet type weak magnetic separation equipment C; 1700-secondary wet type weak magnetic separation equipment C; 1800-concentration magnetic separator; 1900-disc filter; 2000-sand washing equipment II; 2100-dewatering screening apparatus; 2200-a concentration device; 2300-a filter pressing device.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 and fig. 2, the process for the non-waste comprehensive utilization of the ultra-lean magnetite resource in the embodiment includes the following steps:
1. the method comprises the steps of pre-screening crude magnetite ore with the particle size of TFe14.80 percent and minus 500mm by a GZZ1360 vibrating bar feeder, coarsely crushing oversize products by a JC116 jaw crusher, setting the coarsely crushed ore discharge opening to be about 150mm, feeding the coarsely crushed products and undersize products of a bar sieve into a GPY300 cone crusher for intermediate crushing, feeding intermediate crushed products into a ZBD3061 double-layer banana sieve for screening, returning ore with the particle size of more than 30mm to the cone crusher for re-crushing to form closed circulation, and taking coarse and fine ore with the particle size of 30 mm-5 mm and minus 5mm as screened products.
2. Feeding the fine iron ore with the particle size of less than 5mm obtained in the step 1 into a CTY1245 downstream type wet cylinder type permanent magnet magnetic separator for wet type low intensity magnetic separation, wherein the magnetic field intensity can be controlled to be 1000-1500 Oe to obtain coarse concentrate I, and feeding the coarse concentrate I into a fine ore bin; sending the wet low-intensity magnetic separation tailings into a DX3220 wheel bucket sand washer 510 for sand washing operation, dehydrating and screening by a 2KK2460 linear vibration dewatering screen I520, and fishing out construction sand I with the thickness of 5-3 mm; the rest ore enters an FX250X6 cyclone I530 for grading to obtain 3-0.15 mm settled sand, and is subjected to dehydration and screening by a 2KK1560 linear vibration dehydration sieve II 560 to obtain construction sand II; feeding overflow products with the diameter of less than 0.15mm in the classifying operation of the cyclone into a ∅ 28 efficient thickener 540 for concentration, and feeding the concentrated products into a KXMGF700 belt filter press 550 for filter pressing to obtain product stone powder;
3. feeding the 30-5 mm ores obtained in the step (1) into a ∅ 1000CT type permanent magnetic roller, performing dry separation and strong magnetic separation, wherein the field intensity of a magnetic field is 4000-6000 Oe, so as to obtain dry separation rough concentrate II, and feeding the rough concentrate II into a pre-crushing ore bin 800; the thrown dry tailings enter a 2YK2460 double-layer linear vibrating screen for screening and grading to obtain building aggregates (stones) I with the granularity of 30-20 mm, building aggregates (stones) II with the granularity of 20-10 mm and building aggregates (stones) III with the granularity of 10-5 mm;
4. sending the rough concentrate II in the ore bin 800 before re-crushing into an HFKG140-60 high-pressure roller mill for crushing, performing double-layer linear vibration sieve inspection and screening operation by using a 2ZKK3061, and feeding the undersize product and the rough concentrate I into a CTY1540 downstream type wet-type cylindrical low-intensity magnetic separator for wet pre-magnetic separation, wherein the magnetic field intensity can be controlled to be 1500-2000Oe; the particle size of the discharged material below the sieve of the double-layer linear vibrating screen is less than 5 mm; returning the oversize coarse fraction product to the high-pressure roller mill to form closed cycle; feeding the pre-magnetic separation tailings into sand washing equipment II 2000 for sand washing and screening operation;
5. classifying the wet-type pre-magnetic concentrate by an FX350X8 hydrocyclone, feeding settled sand into a first-section overflow ball mill for grinding, feeding overflow into a D5Z122405 five-lamination high-frequency fine sieve for classification, and ensuring the qualified grinding fineness of the ore to be 70-85% of-200 meshes;
6. feeding the first-stage grinding ore discharge into a CTB1230 semi-counter-flow wet-type cylinder low-intensity magnetic separator for magnetic separation (first magnetism), wherein the field intensity can be selected to be 2000-3000 Oe, and returning the magnetic concentrate to the cyclone in the step 5 for classification to form a closed circuit; the product under the high-frequency fine sieve is magnetically separated (secondary magnetic) by a CTB1230 semi-counter-flow wet-type cylinder weak magnetic separator, the field intensity can be selected to be 2000-3000 Oe, and the product on the sieve returns to the cyclone in the step 5 for classification to form closed circulation; feeding the magnetic concentrate into a secondary CTB1230 semi-counter-flow type wet drum type weak magnetic separator for magnetic separation (three magnetic separation), wherein the field intensity can be selected from 2000 to 2500 Oe, concentrating and magnetic separating the secondary magnetic concentrate by a CTB1230 type concentration magnetic separator, the field intensity can be selected from 2000 to 3000 Oe, feeding the magnetic concentrate into a ZPG-8P disc type filter for filtering, and generating a final iron concentrate product; the tailings subjected to wet pre-magnetic separation and the tailings of three semi-counter-flow wet drum type weak magnetic separators are fed into a DX3220 wheel bucket type sand washer to be washed, are screened by a 2KK2460 linear vibration dewatering screen to obtain building sand III with the granularity of 5 mm-0.15 mm on the screen, and undersize products are concentrated by a ∅ 28 high-efficiency thickener and then enter a KXMGF700 quick-pressing type high-pressure diaphragm filter press to be subjected to filter pressing operation to obtain stone powder with the granularity of 0.15 mm-0 mm.
The method can realize that 83.18% gangue minerals are removed before the ores are ground, and finally iron ore concentrate and building sandstone products with the yield of 14.99%, the grade of 66.50% and the recovery rate of 67.36% can be obtained, and the specific process indexes are detailed in the technical parameter table 1.
TABLE 1 technical parameter indexes of the raw ore, intermediate ore and the products obtained in example 1
Example 2
As shown in fig. 1 and fig. 2, the system for comprehensively utilizing ultra-lean magnetite resources without waste in this embodiment includes a pre-screening device 100, a crushing device 200, a screening device i 300, a wet weak magnetic separation device a400, a sand washing device i 500, a dry strong magnetic separation device 600, a screening device ii 700, a re-crushing machine 900, a pre-magnetic separation device 1100, and a first-stage ball mill 1300;
the pre-screening device 100 is used for pre-screening the super-lean magnetite ore, and a vibrating bar feeder can be selected and arranged at the upstream of the crushing device 200;
the crushing device 200 comprises a coarse crushing device 210 and a middle crushing device 220, wherein a discharge port of the coarse crushing device 210 is connected with a feed port of the middle crushing device 220, the coarse crushing device 210 can be a jaw crusher, and the middle crushing device 220 can be a cone crusher;
the screening device I300 is used for grading the closed-circuit crushed ores and is arranged at the downstream of the crushing device 200, and a double-layer banana screen can be selected as the screening device I;
the wet type low-intensity magnetic separation equipment A400, the sand washing equipment I500, the dry type high-intensity magnetic separation equipment 600 and the screening equipment II 700 are respectively arranged at the downstream of the screening equipment I300;
the wet type weak magnetic separation equipment A400 can select a concurrent type wet type cylinder permanent magnetic separator;
as shown in fig. 3, the sand washing equipment i 500 comprises a wheel bucket sand washing machine 510, a linear vibration dewatering screen i 520, a cyclone i 530, a high-efficiency thickener 540 and a belt filter press 550, wherein a discharge port of the wheel bucket sand washing machine 510 is connected with a feed port of the linear vibration dewatering screen i 520, a screen outlet of the linear vibration dewatering screen i 520 is connected with a feed port of the cyclone i 530, a sand settling port of the cyclone i 530 is connected with a linear vibration dewatering screen ii 560, an overflow port is connected with a feed port of the high-efficiency thickener 540, and a discharge port of the high-efficiency thickener 540 is connected with a feed port of the belt filter press 550; the high-efficiency thickener 540 is used for concentrating overflow products with the thickness of less than 0.15mm in the classifying operation of the cyclone, and the belt filter press 550 is used for carrying out filter pressing on the concentrated products;
the dry separation strong magnetic separation device 600 can select a CT type permanent magnetic roller;
the screening equipment II 700 is used for screening and grading the dry separation tailings, and the screening equipment II 700 selects a double-layer linear vibrating screen;
a fine ore bin is arranged at the downstream of the wet type low-intensity magnetic separation device A400;
a re-crushing front ore bin 800 for storing the rough concentrate II is arranged at the downstream of the dry separation strong magnetic separation device 600, a re-crushing machine 900 is simultaneously arranged at the downstream of the wet type weak magnetic separation device A400 and the re-crushing front ore bin 800, and the re-crushing machine 900 can select a high-pressure roller mill; the discharge outlet of the re-crushing machine 900 is connected with the feed inlet of the screening equipment III 1000, and the screening equipment III 1000 can select a double-layer linear vibrating screen; the under-sieve outlet of the screening device III 1000 is connected with the pre-magnetic separation device 1100, and the over-sieve outlet is connected with the feeding port of the re-crushing machine 900; the pre-magnetic separation device 1100 may select a concurrent wet-type cylindrical permanent-magnet magnetic separator; a cyclone II 1200 and a sand washing device II 2000 are arranged at the downstream of the pre-magnetic separation device 1100; a section of ball mill 1300 and a high-frequency fine screen 1400 are arranged at the downstream of the cyclone II 1200; the first-stage ball mill 1300 can be an overflow ball mill, a wet low-intensity magnetic separation device B1500 is arranged at the downstream of the first-stage ball mill, and the wet low-intensity magnetic separation device B1500 can be a semi-counter-flow wet drum type low-intensity magnetic separator; a secondary wet type weak magnetic separation device C is arranged at the downstream of the high-frequency fine sieve 1400, a discharge port of a primary wet type weak magnetic separation device C1600 is connected with a feed port of a secondary wet type weak magnetic separation device C1700, the wet type weak magnetic separation device C can select a semi-countercurrent wet type cylindrical weak magnetic separator, a concentrate outlet of the secondary wet type weak magnetic separation device C1700 is connected with a feed port of a concentrated magnetic separator 1800, a discharge port of the concentrated magnetic separator 1800 is connected with a feed port of a disc type filter 1900, tailing outlets of a pre-magnetic separation device 1100, a wet type weak magnetic separation device B1500, the primary wet type weak magnetic separation device C1600 and the secondary wet type weak magnetic separation device C1700 are all connected with a feed port of a sand washing device II 2000, and the sand washing device II 2000 selects a wheel bucket type sand washing machine; a discharge port of the sand washing equipment II 2000 is connected with the dewatering and screening equipment 2100, and the dewatering and screening equipment 2100 can select a linear vibrating dewatering screen; the undersize outlet of the dewatering and screening device 2100 is sequentially connected with a concentration device 2200 and a filter pressing device 2300; the concentration equipment 2200 selects a high-efficiency thickener; the filter press apparatus 2300 is a belt filter press.
Example 3
As shown in fig. 1 and fig. 2, the process for the non-waste comprehensive utilization of the ultra-lean magnetite resource in the embodiment includes the following steps:
1. the method comprises the steps of pre-screening crude magnetite ore with the particle size of TFe13.50%, -500mm by a GZZ1360 vibrating bar feeder, roughly crushing oversize products by a JC116 jaw crusher, setting the coarsely crushed ore discharge opening to be about 150mm, feeding the coarsely crushed products and undersize products of a bar sieve into a GPY300 cone crusher for medium crushing, feeding the medium crushed products into a ZBD3061 double-layer banana sieve for sieving, returning ore with the particle size of more than 30mm to the cone crusher for re-crushing to form closed circulation, and taking coarse and fine ore with the particle size of 30 mm-5 mm and-5 mm as a screened product.
2. Feeding the fine iron ore with the particle size of less than 5mm obtained in the step 1 into a CTY1245 downstream type wet cylinder type permanent magnet magnetic separator for wet type low intensity magnetic separation, wherein the magnetic field intensity can be controlled to be 1000-1500 Oe to obtain coarse concentrate I, and feeding the coarse concentrate I into a fine ore bin; sending the wet low-intensity magnetic separation tailings into a DX3220 wheel bucket sand washer 510 for sand washing operation, dehydrating and screening by a 2KK2460 linear vibration dewatering screen I520, and fishing out 5 mm-3 mm building sand I; the rest ore enters a 2KK2460 cyclone I530 for grading to obtain 3-0.15 mm settled sand, and the settled sand is subjected to dehydration and screening by a 2KK1560 linear vibration dewatering screen II 560 to obtain building sand II; feeding overflow products with the diameter of less than 0.15mm in the classifying operation of the cyclone into a ∅ 28 efficient thickener 540 for concentration, and feeding the concentrated products into a KXMGF700 belt filter press 550 for filter pressing to obtain product stone powder;
3. feeding the 30 mm-5 mm ores obtained in the step (1) into a ∅ 1000CT type permanent magnetic roller for dry separation and strong magnetic separation, wherein the field intensity of a magnetic field is 400 Oe-6000 Oe, so as to obtain dry separation rough concentrate II, and feeding the rough concentrate II into a pre-crushing ore bin 800; the thrown dry tailings enter a 2YK2460 double-layer linear vibrating screen for screening and grading to obtain building aggregates (stones) I with the granularity of 30-20 mm, building aggregates (stones) II with the granularity of 20-10 mm and building aggregates (stones) III with the granularity of 10-5 mm;
4. sending the rough concentrate II in the ore bin 800 before re-crushing into an HFKG140-60 high-pressure roller mill for crushing, and performing double-layer linear vibration screen inspection and screening operation by using a 2ZKK3061, wherein undersize products and the rough concentrate I enter a CTY1540 downstream type wet barrel type weak magnetic separator together for wet pre-magnetic separation, and the magnetic field intensity can be controlled to be 1500-2000Oe; the particle size of the discharged material below the sieve of the double-layer linear vibrating screen is less than 5 mm; returning the oversize coarse fraction products to the high-pressure roller mill to form closed cycle; feeding the pre-magnetic tailings into sand washing equipment II 2000 for sand washing and screening;
5. classifying the wet-type pre-magnetic concentrate by an FX350X8 hydrocyclone, feeding settled sand into a first-section overflow ball mill for grinding, feeding overflow into a D5Z122405 five-lamination high-frequency fine sieve for classification, and ensuring the qualified grinding fineness of the ore to be 70-85% of-200 meshes;
6. feeding the first-stage grinding ore discharge into a CTB1230 semi-counter-flow wet-type cylinder low-intensity magnetic separator for magnetic separation (first magnetism), wherein the field intensity can be selected to be 2000-3000 Oe, and returning the magnetic concentrate to the cyclone in the step 5 for classification to form a closed circuit; magnetically separating (secondary magnetic) the undersize product of the high-frequency fine sieve by a CTB1230 semi-counter-flow wet-type cylinder weak magnetic separator, and returning the oversize product to the cyclone in the step 5 for grading to form closed cycle; feeding the magnetic concentrate into a secondary CTB1230 semi-counter-flow type wet drum type weak magnetic separator for magnetic separation (three magnetic separation), wherein the field intensity can be selected from 2000 to 2500 Oe, concentrating and magnetic separating the secondary magnetic concentrate by a CTB1230 type concentration magnetic separator, the field intensity can be selected from 2000 to 3000 Oe, feeding the magnetic concentrate into a ZPG-8P disc type filter for filtering, and generating a final iron concentrate product; the tailings subjected to wet pre-magnetic separation and the tailings of three semi-counter-flow wet drum type weak magnetic separators are fed into a DX3220 wheel bucket type sand washer to be washed, are screened by a 2KK2460 linear vibration dewatering screen to obtain building sand III with the granularity of 5 mm-0.15 mm on the screen, and undersize products are concentrated by a ∅ 28 high-efficiency thickener and then enter a KXMGF700 quick-pressing type high-pressure diaphragm filter press to be subjected to filter pressing operation to obtain stone powder with the granularity of 0.15 mm-0 mm.
The method can realize that 87.23% gangue minerals are removed before the ores are ground, and finally iron ore concentrate and building sandstone products with the yield of 13.53%, the grade of 65.48% and the recovery rate of 65.62% can be obtained, and the specific process indexes are detailed in the technical parameter table 2.
TABLE 2 technical parameter indexes of raw ore, intermediate ore and obtained product in example 3
Example 4
As shown in fig. 1 and fig. 2, the process for the waste-free comprehensive utilization of the ultra-lean magnetite resource in the embodiment includes the following steps:
1. the method comprises the steps of pre-screening crude magnetite ore with TFe12.85%, -500mm granularity by a GZZ1360 vibrating bar feeder, roughly crushing the oversize product by a JC116 jaw crusher, setting the roughly crushed ore discharge opening to be about 150mm, feeding the roughly crushed product and the undersize product of the bar sieve into a GPY300 cone crusher for intermediate crushing, feeding the intermediate crushed product into a ZBD3061 double-layer banana sieve for screening, returning the ore with the granularity of more than 30mm to the cone crusher for re-crushing to form closed circulation, and taking the coarse ore with the granularity of 30 mm-5 mm and minus 5mm as the screened product.
2. Feeding the fine iron ore with the particle size of less than 5mm obtained in the step 1 into a CTY1245 downstream type wet cylinder type permanent magnet magnetic separator for wet type low intensity magnetic separation to obtain coarse concentrate I, wherein the magnetic field intensity can be controlled to be 1000-1500 Oe, and the coarse concentrate I is fed into a fine ore bin; sending the wet low-intensity magnetic separation tailings into a DX3220 wheel bucket sand washer 510 for sand washing operation, dehydrating and screening by a 2KK2460 linear vibration dewatering screen I520, and fishing out 5 mm-3 mm building sand I; the rest ore enters an FX250X6 cyclone I530 for grading to obtain 3-0.15 mm settled sand, and is subjected to dehydration and screening by a 2KK1560 linear vibration dehydration sieve II 560 to obtain construction sand II; feeding overflow products with the diameter of less than 0.15mm in the classifying operation of the cyclone into a ∅ 28 efficient thickener 540 for concentration, and feeding the concentrated products into a KXMGF700 belt filter press 550 for filter pressing to obtain product stone powder;
3. feeding the 30 mm-5 mm ores obtained in the step 1 into a ∅ 1000CT type permanent magnetic roller for dry separation and strong magnetic separation, wherein the field intensity of a magnetic field is 4000 Oe-6000 Oe, so as to obtain dry separation rough concentrate II, and feeding the rough concentrate II into a pre-crushing ore bin 800; the thrown dry tailings enter a 2YK2460 double-layer linear vibrating screen for screening and grading to obtain building aggregates (stones) I with the granularity of 30-20 mm, building aggregates (stones) II with the granularity of 20-10 mm and building aggregates (stones) III with the granularity of 10-5 mm;
4. sending the rough concentrate II in the ore bin 800 before re-crushing into an HFKG140-60 high-pressure roller mill for crushing, performing double-layer linear vibration sieve inspection and screening operation by using a 2ZKK3061, feeding the undersize product and the rough concentrate I into a CTY1540 downstream type wet barrel type weak magnetic separator for wet pre-magnetic separation, and controlling the magnetic field intensity to be 1500-2000Oe; the particle size of the discharged material below the sieve of the double-layer linear vibrating screen is less than 5 mm; returning the oversize coarse fraction product to the high-pressure roller mill to form closed cycle; feeding the pre-magnetic tailings into sand washing equipment II 2000 for sand washing and screening;
5. classifying the wet-type pre-magnetic concentrate by an FX350X8 hydrocyclone, feeding settled sand into a first-section overflow ball mill for grinding, feeding overflow into a D5Z122405 five-lamination high-frequency fine sieve for classification, and ensuring the qualified grinding fineness of the ore to be 70-85% of-200 meshes;
6. feeding the primary grinding ore discharge into a primary CTB1230 semi-counter-flow wet-type cylinder low-intensity magnetic separator for magnetic separation (first magnetism), wherein the field intensity can be selected to be 2000-3000 Oe, and returning the magnetic concentrate to the cyclone in the step 5 for classification to form a closed circuit; the undersize product of the high-frequency fine sieve is magnetically separated (magnetized) by a CTB1230 semi-counter-flow type wet cylinder type weak magnetic separator, the field intensity can be selected to be 2000-3000 Oe, and the oversize product returns to the cyclone in the step 5 for classification to form closed circulation; feeding the magnetic concentrate into a secondary CTB1230 semi-counter-flow type wet-drum weak magnetic separator for magnetic separation (three-magnet separation), wherein the field intensity can be selected to be 2000-2500 Oe, concentrating and magnetic separating the secondary magnetic concentrate by a CTB1230 type concentration magnetic separator, the field intensity can be selected to be 2000-3000 Oe, feeding the magnetic concentrate into a ZPG-8P disc type filter for filtering, and generating a final iron concentrate product; the tailings subjected to wet pre-magnetic separation and the tailings of three semi-counter-current wet-type cylindrical low-intensity magnetic separators are fed into a DX3220 wheel bucket type sand washer to be washed, screening is carried out through a 2KK2460 linear vibration dewatering screen to obtain building sand III with the particle size on the screen of 5-0.15 mm, a product under the screen is concentrated through a ∅ 28 high-efficiency thickener, and then the building sand III enters a KXMGF700 high-pressure diaphragm filter press to be subjected to filter pressing operation to obtain stone powder with the particle size of 0.15-0 mm.
By the steps, 88.41% gangue minerals can be removed before the ores are ground, and finally iron ore concentrate and building sandstone products with the yield of 12.78%, the grade of 65.36% and the recovery rate of 64.98% can be obtained, and specific process indexes are detailed in the technical parameter table 3.
TABLE 3 technical parameter indexes of raw ore, intermediate ore and obtained product in example 4
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A waste-free comprehensive utilization process of ultra-lean magnetite resources is characterized by comprising the following steps:
s1, pre-screening raw ores of the super-lean magnetic iron ores, crushing the raw ores through a closed circuit, grading the ores according to the requirement of preset granularity, and returning the ores with the granularity of more than 30mm to perform secondary crushing; coarse and fine ores with the grain sizes of 30 mm-5 mm and minus 5mm are used as screening products;
s2, performing wet type low-intensity magnetic separation on ores with two coarse and fine grades and ores with a grain diameter of-5 mm to obtain coarse concentrate I, and performing sand washing and grading operation on wet type low-intensity magnetic separation tailings to obtain building sands with different grain grades; carrying out dry separation and strong magnetic separation on the ore with the particle size of 30-5 mm to obtain dry separation rough concentrate II, and screening and grading the discarded dry separation tailings to obtain building aggregate with different particle size grades;
s3, feeding the rough concentrate II into a re-crushing machine for crushing, and performing wet pre-magnetic separation on the rough concentrate II and the rough concentrate I together through inspection and screening; feeding the pre-magnetic tailings into a sand washing machine to perform sand washing and screening operation;
s4, carrying out classification operation on the pre-magnetic separation concentrate through a cyclone, feeding settled sand into a first-stage ball mill for grinding, and feeding overflow into a high-frequency fine sieve for classification;
s5, feeding the primary grinding ore discharge into wet low-intensity magnetic separation equipment B (1500) for magnetic separation, and returning magnetic concentrate to the cyclone in the step S4 for classification to form a closed circuit; magnetically separating the product under the high-frequency fine sieve by at least one wet type low-intensity magnetic separation device C, concentrating and magnetically separating the magnetic concentrate by a concentration magnetic separator, and filtering the magnetic concentrate by a disc filter to generate a final iron concentrate product; returning the oversize product to the cyclone in the step S4 for grading to form closed circulation; and feeding the tailings subjected to wet pre-magnetic separation, the tailings subjected to wet low-intensity magnetic separation equipment B and the tailings subjected to wet low-intensity magnetic separation equipment C into a sand washing machine for sand washing, screening and filter pressing to obtain building sand and stone powder.
2. The process for the waste-free comprehensive utilization of the ultra-lean magnetite resources as claimed in claim 1, wherein the closed-circuit crushing is two-stage one-closed-circuit crushing in which coarse crushing is performed before intermediate crushing, intermediate crushing products are screened, and ores with a particle size of more than 30mm are returned to the intermediate crushing again; or coarse crushing, medium crushing and fine crushing, sieving the fine crushed product, and returning ore with the granularity of more than 30mm to the three-section one-closed-circuit crushing of the fine crushed product.
3. The process for the non-waste comprehensive utilization of the ultra-lean magnetite ore resources as claimed in claim 2, wherein in the step S2, the wet low-intensity magnetic separation tailings are subjected to sand washing operation, and are dehydrated and screened to be fished out of 5mm to 3mm of construction sand i; grading the rest ore by using a cyclone to obtain 3-0.15 mm settled sand, and dehydrating and screening to obtain building sand II; and concentrating overflow products with the diameter of less than 0.15mm in the classifying operation of the cyclone, and performing filter pressing on the concentrated products to obtain product stone powder.
4. The process for the waste-free comprehensive utilization of the ultra-lean magnetite resources as claimed in claim 2, wherein in the step S2, the discarded dry tailings are screened and classified to obtain building aggregates with three specifications of 30mm to 20mm, 20mm to 10mm and 10mm to 5 mm.
5. The ultra-lean magnetite resource waste-free comprehensive utilization system is realized according to any one of claims 1 to 4, and comprises a pre-screening device (100), a crushing device (200), a screening device I (300), a wet type weak magnetic separation device A (400), a sand washing device I (500), a dry separation strong magnetic separation device (600), a screening device II (700), a re-crushing machine (900), a pre-magnetic separation device (1100) and a section of ball mill (1300), wherein the pre-screening device (100) is used for pre-screening the ultra-lean magnetite raw ore and is arranged at the upstream of the crushing device (200); the screening equipment I (300) is used for grading the ore subjected to closed circuit crushing and is arranged at the downstream of the crushing equipment (200); the wet type low-intensity magnetic separation equipment A (400), the sand washing equipment I (500), the dry separation high-intensity magnetic separation equipment (600) and the screening equipment II (700) are respectively arranged at the downstream of the screening equipment I (300), and the screening equipment II (700) is used for screening and grading the dry separation tailings; a re-crushing front ore bin (800) for storing coarse ore II is arranged at the downstream of the dry separation strong magnetic separation device (600), a re-crushing machine (900) is arranged at the downstream of the wet type weak magnetic separation device A (400) and the re-crushing front ore bin (800) at the same time, a discharge port of the re-crushing machine (900) is connected with a feed port of a screening device III (1000), a screen lower outlet of the screening device III (1000) is connected with a pre-magnetic separation device (1100), and a screen upper outlet is connected with a feed port of the re-crushing machine (900); a cyclone II (1200) and a sand washing device II (2000) are arranged at the downstream of the pre-magnetic separation device (1100); a section of ball mill (1300) and a high-frequency fine screen (1400) are arranged at the downstream of the cyclone II (1200); the downstream of one section of ball mill is provided with a wet type weak magnetic separation device B (1500), the downstream of the high-frequency fine sieve (1400) is provided with at least one wet type weak magnetic separation device C, a concentrate outlet of the wet type weak magnetic separation device C is connected with a feeding port of a concentrated magnetic separator (1800), a discharging port of the concentrated magnetic separator (1800) is connected with a feeding port of a disc type filter (1900), tailings outlets of the pre-magnetic separation device (1100), the wet type weak magnetic separation device B (1500) and the wet type weak magnetic separation device C are connected with a feeding port of a sand washing device II (2000), a discharging port of the sand washing device II (2000) is connected with a dewatering screening device (2100), and an undersize outlet of the dewatering screening device (2100) is sequentially connected with the concentrated device (2200) and a filter pressing device (2300).
6. The ultra-lean magnetite resource waste-free comprehensive utilization system according to claim 5, wherein the crushing device (200) comprises a coarse crushing device (210) and a middle crushing device (220), and a discharge port of the coarse crushing device (210) is connected with a feed port of the middle crushing device (220).
7. The ultra-lean magnetite resource waste-free comprehensive utilization system according to claim 6, wherein the coarse crushing plant (210) is a jaw crusher; the middle crushing equipment (220) is a cone crusher.
8. The ultra-lean magnetite resource waste-free comprehensive utilization system according to claim 5, wherein the screening device II (700) is a double-layer linear vibrating screen.
9. The ultra-lean magnetite resource waste-free comprehensive utilization system as claimed in claim 5, wherein the sand washing equipment I (500) comprises a wheel bucket sand washing machine (510), a linear vibration dewatering screen I (520), a cyclone I (530), a high-efficiency thickener (540) and a belt filter press (550), wherein a discharge port of the wheel bucket sand washing machine (510) is connected with a feed port of the linear vibration dewatering screen I (520), a screen bottom outlet of the linear vibration dewatering screen I (520) is connected with a feed port of the cyclone I (530), a sand settling port of the cyclone I (530) is connected with a linear vibration dewatering screen II (560), an overflow port is connected with a feed port of the high-efficiency thickener (540), and a discharge port of the high-efficiency thickener (540) is connected with a feed port of the belt filter press (550); the high-efficiency thickener (540) is used for concentrating overflow products with the thickness of less than 0.15mm in the classifying operation of the cyclone, and the belt filter press (550) is used for carrying out filter pressing on the concentrated products.
10. The ultra-lean magnetite resource waste-free comprehensive utilization system according to claim 5, wherein the wet weak magnetic separation device A (400) and the pre-magnetic separation device (1100) are both downstream wet barrel permanent magnetic separators; the wet type low-intensity magnetic separation equipment B (1500) and the wet type low-intensity magnetic separation equipment C are both semi-counter current type wet type barrel low-intensity magnetic separators.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107185686A (en) * | 2017-04-27 | 2017-09-22 | 酒泉钢铁(集团)有限责任公司 | A kind of ferric oxide ore combined mineral dressing technology |
| CN108212506A (en) * | 2018-03-09 | 2018-06-29 | 中钢集团马鞍山矿山研究院有限公司 | A kind of classification pre-selection of magnetic-red-water chestnut compound iron ore, fine New Method for Sorting |
| CN208695268U (en) * | 2018-06-21 | 2019-04-05 | 安徽金安矿业有限公司 | A kind of higher magnetic iron ore ore-dressing plant of obturation content |
| CN109675715A (en) * | 2018-11-14 | 2019-04-26 | 安徽工业大学 | A kind of pre-selection technique of the red mixing poor iron ore of magnetic- |
| CN110898957A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Particle size grading pre-selection tailing discarding process for extremely lean hematite |
| CN113333152A (en) * | 2021-06-03 | 2021-09-03 | 中冶北方（大连）工程技术有限公司 | Mineral separation pre-selection process for comprehensively utilizing barren rock of ultra-lean iron ore tailings |
| CN114247555A (en) * | 2021-12-22 | 2022-03-29 | 武钢资源集团金山店矿业有限公司 | Crushing and grinding magnetic separation treatment process for iron ore |
-
2022
- 2022-10-28 CN CN202211330652.2A patent/CN115382662B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107185686A (en) * | 2017-04-27 | 2017-09-22 | 酒泉钢铁(集团)有限责任公司 | A kind of ferric oxide ore combined mineral dressing technology |
| CN108212506A (en) * | 2018-03-09 | 2018-06-29 | 中钢集团马鞍山矿山研究院有限公司 | A kind of classification pre-selection of magnetic-red-water chestnut compound iron ore, fine New Method for Sorting |
| CN208695268U (en) * | 2018-06-21 | 2019-04-05 | 安徽金安矿业有限公司 | A kind of higher magnetic iron ore ore-dressing plant of obturation content |
| CN109675715A (en) * | 2018-11-14 | 2019-04-26 | 安徽工业大学 | A kind of pre-selection technique of the red mixing poor iron ore of magnetic- |
| CN110898957A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Particle size grading pre-selection tailing discarding process for extremely lean hematite |
| CN113333152A (en) * | 2021-06-03 | 2021-09-03 | 中冶北方（大连）工程技术有限公司 | Mineral separation pre-selection process for comprehensively utilizing barren rock of ultra-lean iron ore tailings |
| CN114247555A (en) * | 2021-12-22 | 2022-03-29 | 武钢资源集团金山店矿业有限公司 | Crushing and grinding magnetic separation treatment process for iron ore |
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