CN114570524A - Comprehensive utilization method for low-grade vanadium titano-magnetite pre-concentration waste disposal - Google Patents
Comprehensive utilization method for low-grade vanadium titano-magnetite pre-concentration waste disposal Download PDFInfo
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- 239000002699 waste material Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 36
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052720 vanadium Inorganic materials 0.000 title claims abstract description 31
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000004094 preconcentration Methods 0.000 title claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 47
- 238000005498 polishing Methods 0.000 claims abstract description 24
- 230000002000 scavenging effect Effects 0.000 claims abstract description 19
- 230000005484 gravity Effects 0.000 claims abstract description 13
- 238000007885 magnetic separation Methods 0.000 claims abstract description 13
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 239000012141 concentrate Substances 0.000 claims description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 24
- 239000006148 magnetic separator Substances 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 12
- 229910052719 titanium Inorganic materials 0.000 claims description 12
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000007517 polishing process Methods 0.000 claims description 3
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000004134 energy conservation Methods 0.000 abstract 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 17
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 230000008901 benefit Effects 0.000 description 8
- 238000011084 recovery Methods 0.000 description 7
- 239000011435 rock Substances 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000004576 sand Substances 0.000 description 5
- 238000010408 sweeping Methods 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 4
- -1 titanium metals Chemical class 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000009435 building construction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 239000002516 radical scavenger Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
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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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of vanadium titano-magnetite, and particularly relates to a low-grade vanadium titano-magnetite pre-selection waste-throwing comprehensive utilization method. The invention aims to provide a comprehensive utilization method for low-grade vanadium titano-magnetite pre-selection polishing waste, thereby realizing the purposes of more crushing and less grinding of Panxi vanadium titano-magnetite, energy saving and consumption reduction and greatly improving the grinding grade. The low-grade vanadium titano-magnetite pre-concentration waste-throwing comprehensive utilization method comprises the following steps: carrying out rough polishing and fine polishing on the low-grade vanadium titano-magnetite in sequence; wherein, the rough polishing includes in proper order: coarse crushing, medium crushing, first-stage screening, fine crushing, magnetic pulley coarse separation, gravity magnetic pulling and scavenging and second-stage screening; finely throw and include in proper order: and the third stage of screening, rolling and grinding for superfine crushing, and magnetic separation for fine polishing. The method can achieve the purposes of energy conservation, consumption reduction, cost reduction and efficiency improvement, and is beneficial to the development and utilization of low-grade vanadium-titanium magnetite ores.
Description
Technical Field
The invention belongs to the technical field of vanadium titano-magnetite, and particularly relates to a low-grade vanadium titano-magnetite pre-selection waste-throwing comprehensive utilization method.
Background
With the sustainable and stable development of economy in China, the infrastructure also enters a high-speed development period, the demand of each place on the gravels and gravels for buildings is increased day by day, and even the phenomenon of short supply and demand occurs. At present, with the increasing comprehensive utilization rate of vanadium-titanium magnetite resources in the Panxi region, mine enterprises discard the low-grade extraterrestrial ores stripped from the dump to effectively recover the metal minerals (mainly comprising iron and titanium) with lower and lower grades (the iron-containing grade is 10-15%, and the titanium grade is 3-5.5%), and the recycling difficulty of iron and titanium metals of the partial discarded waste ores is increasing.
The key of improving the utilization rate of low-grade iron ore resources and reducing the production cost of ore dressing is that the ore dressing process has more crushing and less grinding and can throw and throw early. At present, the existing raw ore waste-throwing process of a selecting factory mainly adopts a section of dry magnetic pulley to pre-select waste-throwing or a section of dry magnetic separator to throw waste in a two-section or three-section crushing process. The disadvantages of this process are: the ore granularity of the raw ore is still larger after two-section or three-section crushing, the dissociation degree of the ore is not enough, the iron and titanium in tailings are higher, the waste of iron and titanium metals is serious, the grade amplitude of the concentrate is only about 1 percent, and the purposes of discarding waste, reducing consumption and improving the selected grade are not really achieved. Some ore dressing plants use the heavy magnetic pull to recycle the vanadium-titanium magnet tailings, and have the defects of low heavy magnetic pull processing capacity and high manufacturing cost, and equipment cost and operating cost are increased when a large amount of raw ores are processed.
Therefore, a process capable of improving the utilization rate of the low-grade vanadium titano-magnetite and reducing the production cost of ore dressing through a simple process is urgently needed to be developed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a comprehensive utilization method of low-grade vanadium titano-magnetite pre-selection waste throwing, so that the goals of increasing the amount of broken vanadium titano-magnetite, reducing the grinding amount, saving energy, reducing consumption and greatly improving the grinding grade of the low-grade vanadium titano-magnetite are realized.
The low-grade vanadium titano-magnetite pre-concentration waste-throwing comprehensive utilization method comprises the following steps: carrying out rough polishing and fine polishing on the low-grade vanadium titano-magnetite in sequence; wherein, the rough polishing includes in proper order: coarse crushing, medium crushing, first-stage screening, fine crushing, magnetic pulley coarse separation, gravity magnetic pulling and scavenging and second-stage screening; finely throw and include in proper order: and the third stage of screening, rolling and grinding for superfine crushing, and magnetic separation for fine polishing.
Further, the grain diameter of the material obtained after coarse crushing is less than or equal to 150mm, and preferably 100 mm.
Further, the particle size of the material obtained after the middle breaking is less than or equal to 80mm, preferably 50 mm.
Further, in the first stage of screening, coarse fraction materials which are screened to be larger than or equal to 25mm are subjected to fine crushing through conical crushing, and fine crushed products enter screening to form closed cycle.
Furthermore, the grain size of the fine-fraction material after the first stage of screening is less than or equal to 25 mm.
Further, coarsely sorting the screened fine-grained materials through a magnetic pulley, wherein the field intensity is 0.2-0.3T, and when TFe is less than or equal to 10 wt%, TiO is2Less than or equal to 3.5 wt%, and performing gravity magnetic scavenging on the tailings after the magnetic pulley roughing.
Further, after the scavenging concentrate is classified by a vibrating screen, the screen hole of the vibrating screen is 1-3 mm, and oversize products with the particle size of 1-25 mm and the concentrate roughly selected by a magnetic pulley are combined to enter a fine polishing process; grading scavenged tailings by a vibrating screen, wherein screen holes are 0.5-2 mm, and grading oversize materials into broken stones and gravels; and combining the undersize and the undersize of the scavenging concentrate into a fine throwing flow.
And further, the third stage of screening is to grade the rough-cast concentrate by a vibrating screen, the screen holes are 3-8 mm, the undersize material enters a magnetic separator, and the oversize material enters a rolling mill.
Further, the superfine crushing of the roller mill is to feed oversize materials into the roller mill for superfine crushing, and the crushed products enter a third section for screening to form closed cycle.
Further, the magnetic separation fine throwing is to feed the undersize of the second and third section sieves into a magnetic separator, the field intensity of the magnetic separator is 0.35-0.55T, fine throwing is carried out, a concentrate product is obtained, and an iron separation system is removed. And (3) classifying the tailings by a sieve with 1 mm-14 mm sieve pores, removing the undersize products to a titanium separation system, and taking the oversize products as sandstone products.
Has the advantages that:
the invention carries out four crushing industries, six screening operations and three pre-selection waste disposal on the low-grade vanadium-titanium magnetite ore, and has the advantages that:
1) in the invention, advantages and disadvantages of the magnetic pulley and the heavy magnetic pull are skillfully utilized, so that the advantages are complemented, the aim of fully recovering useful metals in the extremely low-grade vanadium titano-magnetite is fulfilled, and domestic precedents are created.
2) In the fine-grained products of the tailings after the heavy magnetic sweeping, part of dissociated useful metals exist, and the metal recovery is facilitated through secondary screening; and (4) the concentrate after the gravity magnetic separation is subjected to screening and dehydration again, so that the concentrate can enter a rolling mill for crushing, and the crushing amount is reduced.
3) The heavy magnetic pull tailings can be graded by the double-layer sieve again to produce gravels and gravels for building construction, so that the purpose of waste utilization is achieved, and the economic benefit is increased.
4) And (3) finely polishing the superfine crushed product by using the permanent magnet semi-countercurrent magnetic separator again, further polishing waste rocks, and reducing the ore amount entering a grinding and selecting system. Meanwhile, after the waste rocks are classified by screening, sand products can be produced.
5) By the method, the TFe of the raw ore entering the iron separation system is improved by 10.68 percent, and the TiO of the raw ore entering the grinding separation system2The recovery rate of iron is improved by 1.58 percent, the recovery rate of titanium is 81.2 percent, the comprehensive grade of waste rock TFe6.98 percent and the comprehensive grade of TiO are improved by 77.2 percent in the whole process21.90 percent and the waste throwing rate is 41.1 percent. The purposes of saving energy, reducing consumption, reducing cost and improving efficiency are achieved, and the development and utilization of low-grade vanadium-titanium magnetite ore are facilitated.
Drawings
FIG. 1 is a flow chart of the low-grade vanadium titano-magnetite pre-concentration waste-discarding comprehensive utilization method of the invention;
fig. 2 is a diagram showing specific operational parameters and data of a low-grade vanadium titano-magnetite pre-concentration waste-disposal comprehensive utilization method in embodiment 1 of the present invention.
Detailed Description
The comprehensive utilization method of the low-grade vanadium titano-magnetite pre-concentration waste disposal of the invention comprises two steps of rough disposal and fine disposal:
rough throwing, namely crushing the raw ore in three sections, then roughly separating the crushed raw ore by using a magnetic pulley, and enabling the roughly separated tailings to enter a gravity magnetic separator to remove part of waste rocks.
Fine throwing, namely crushing the rough thrown concentrate through a roller mill, then wet throwing the product with the diameter less than 5mm through a magnetic separator, classifying tailings by using a dewatering screen, utilizing oversize products as sand stones, and feeding undersize products into a classification system.
Meanwhile, rubble and sand for construction are respectively generated by twice waste throwing, so that the purposes of waste utilization and metal recovery rate improvement are achieved, the aim of comprehensive utilization of ore-containing waste rocks in Panxi is really achieved, and the comprehensive utilization rate of resources is greatly improved.
First, rough polishing
1) Coarse crushing: feeding low-grade ore from a stope into a jaw crusher for coarse crushing; the grain diameter of the material obtained after coarse crushing is less than or equal to 150mm, and preferably 100 mm;
2) breaking in middle: feeding the coarsely crushed product into a hydraulic cone for crushing again; the grain diameter of the material obtained after the medium crushing is less than or equal to 80mm, preferably 50 mm;
3) screening in the first stage: grading the medium-broken product by a screening machine;
4) fine breaking: carrying out fine crushing on coarse fraction products which are larger than or equal to 25mm in the screening process through conical crushing, and screening the fine crushed products to form closed cycle;
5) roughing a magnetic pulley: roughly sorting fine-grained products which are screened and are not more than 25mm through a magnetic pulley, wherein the field intensity is 0.2-0.3T;
6) heavy magnetic sweeping: when TFe is less than or equal to 10 wt% and TiO2 is less than or equal to 3.5 wt%, feeding the tailings after magnetic pulley roughing into a gravity magnetic pulling for scavenging;
7) and (3) second-stage screening: after the scavenging concentrate is classified by a vibrating screen with 1-3 mm sieve pores, oversize products with the particle size of 1-25 mm and the concentrate coarsely separated by a magnetic pulley are combined and enter a fine polishing process. The scavenged tailings are firstly classified by a vibrating screen with screen holes of 0.5-2 mm, and oversize products are classified to become broken stones and gravels. And combining the undersize and the undersize of the scavenging concentrate into a fine throwing flow.
Second, fine polishing
1) And (3) screening in a third stage: classifying the rough-polished concentrate through a vibrating screen with 3-8 mm screen holes, feeding undersize into a magnetic separator, and feeding oversize into a rolling mill;
2) rolling and grinding to obtain superfine powder: feeding the oversize material into a roller mill for superfine crushing, and feeding the crushed product into a third section for screening to form closed cycle;
3) magnetic separation and fine polishing: and feeding the undersize products of the third-stage sieve and the undersize products of the second-stage sieve into a magnetic separator (with the field intensity of 0.35-0.55T) for fine throwing to obtain a concentrate product, and removing iron in a system. And (3) classifying the tailings by a sieve with 1 mm-14 mm sieve pores, removing the undersize products to a titanium separation system, and taking the oversize products as sandstone products.
After the medium-sized breaking and the fine-sized breaking, the magnetic pulley with low field intensity is adopted to carry out primary pre-selection waste throwing on the ore with the granularity less than or equal to 25 mm. The magnetic pulley has the advantages of large processing capacity, low equipment cost and small installation space. Just make up the defects of the magnetic pull: small processing capacity, high equipment cost and large installation space.
The invention utilizes the gravity magnetic pull to carry out wet magnetic separation on the roughed tailings, can fully and effectively separate ores, can throw off most of waste rocks, and can recover useful metals, particularly titanium metals, as far as possible. The heavy magnetic drawing has the advantages of high metal recovery rate and low tailing grade. Just make up the shortcoming of magnetism pulley: the tailings are high in grade, the metal recovery rate is low, and particularly the loss of titanium metal is large.
In fine-grained products of tailings after heavy magnetic sweeping, part of dissociated useful metals exist, and metal recovery is facilitated through secondary screening; and (4) the concentrate after the gravity magnetic separation is subjected to screening and dehydration again, so that the concentrate can enter a rolling mill for crushing, and the crushing amount is reduced.
The heavy magnetic pull tailings can be graded by the double-layer sieve again to produce gravels and gravels for building construction, so that the purpose of waste utilization is achieved, and the economic benefit is increased.
The product after superfine crushing is finely thrown by using the permanent magnet semi-countercurrent magnetic separator again, so that the waste rocks are further thrown, and the ore amount entering a grinding and selecting system is reduced. Meanwhile, after the waste rocks are classified by screening, sand products can be produced.
The invention is further illustrated by the following examples in conjunction with the drawings. The percentages mentioned in the following experiments are all percentages by mass.
Example 1
First, rough polishing
1) Coarse crushing: low grade raw ore from stope (TFe 12.58%, TiO)24.16%) of the coarse powder is conveyed to a raw ore bin of a coarse crushing workshop of a sorting plant, and then the raw ore is fed into a jaw crusher for coarse crushing;
2) breaking in middle: feeding the coarsely crushed product into a hydraulic conical crusher for crushing again;
3) screening in the first stage: grading the medium broken product by a square hole sieve with 25mm by 25mm meshes to obtain two products, namely a first-section oversize product (for fine breaking) and a first-section undersize product (for magnetic pulley roughing);
4) fine breaking: performing fine crushing on the coarse fraction product in the first-stage screening process through hydraulic cone crushing, and enabling the fine crushed product to enter the first-stage screening again to form closed cycle;
5) roughing a magnetic pulley: roughing the fine fraction product (240T/h) screened at the first stage by a magnetic pulley (field intensity of 0.2T) to obtain two products, namely roughed concentrate (TFe 17.27%, TiO 17%25.15%, high pressure roller mill) and rougher tailings (TFe 9.25%, TiO)23.46 percent, removing the weight and carrying out magnetic pulling and scavenging);
6) heavy magnetic field sweeping: feeding the tailing product after magnetic pulley roughing into a gravity magnetic pulling to carry out wet scavenging, and scavenging to obtain two products, namely scavenging concentrate (TFe 11.28%, TiO)24.79%, descreening 2) and scavenger tail (TFe 7.05%, TiO)22.02%, go to sieve 5);
7) and (3) second-stage screening: sieving the concentrated concentrate by a sieve with 2 mm-16 mm sieve pores to obtain two products which are respectively sievedThe product on the second section concentrate screen (high pressure roller milling removal) and the product under the second section concentrate screen (magnetic separation removal). Sieving the heavy magnetic scavenging tailings by a sieve with 0.5 mm-14 mm sieve pores to obtain two products, namely the products on the second section of tailings (TFe6.9 percent and TiO)21.85%, yield 25.5%, go to sieve 6) and second section tailings undersize product (TFe 8.52%, TiO 8.52%)23.69%, yield 2.6%, magnetic separation removal);
second, fine polishing
1) Superfine crushing and third-stage screening: screening 3 and grading the magnetic pulley concentrate and the heavy magnetic pulling concentrate, crushing oversize products by a high-pressure roller mill, and performing magnetic separation on undersize products;
2) magnetic separation and fine polishing: feeding the undersize product of the screening 3 and the undersize product of the second stage of screening into a magnetic separator (the field intensity is 0.45T) for fine throwing to obtain a concentrate product (20.55 percent of TFe, TiO)26.60%, yield 39.3%, iron removal system), classifying the tailings by a sieve with 1mm x 14mm of sieve holes, and screening the tailings (TFe 8.12%, TiO 8)23.35% yield 24.1%) fraction of the titanium system, oversize (TFe 7.10%, TiO 2)22.58%, yield 11.1%) was sand product.
In the above steps, the specific operation parameters and data are shown in detail in fig. 2.
Comparative example 1
1) Coarse crushing: low grade raw ore from stope (TFe 12.58%, TiO)24.16%) of the coarse powder is conveyed to a raw ore bin of a coarse crushing workshop of a sorting plant, and then the raw ore is fed into a jaw crusher for coarse crushing;
2) breaking in the middle: feeding the coarsely crushed product into a hydraulic conical crusher for crushing again;
3) screening in the first stage: grading the medium broken product by a square hole sieve with 25mm by 25mm meshes to obtain two products, namely a first-section oversize product (for fine breaking) and a first-section undersize product (for magnetic pulley roughing);
4) fine breaking: carrying out fine crushing on the coarse fraction product in the first-stage screening process through hydraulic cone crushing, and feeding the fine crushed product into the first-stage screening again to form closed cycle;
5) heavy magnetic field sweeping: the undersize material (180t/h) of the first stage screening process is fed into a heavy magnetic pull for wettingTwo products are obtained by the formula scavenging, namely scavenging concentrate (TFe 14.04 percent, TiO)24.59%) and scavenger tail (TFe 8.15%, TiO)2 3.37％)。
Only adopting the gravity magnetic pulling to carry out the waste throwing process on the finely broken materials, wherein the average total broken treatment capacity is 180t/h, the TFe content in the tailings of the gravity magnetic pulling and waste throwing is 8.15 percent, and the TiO content in the tailings is TiO23.37 percent of coarse polished concentrate TFe 14.04 percent of TiO24.59 percent. And the waste is thrown by adopting a mode of combining a magnetic pulley and a heavy magnetic pull, the average total treatment capacity of the broken waste is 240t/h, TFe 7.05 percent and TiO 7 percent in the tailings of the heavy magnetic pull waste throwing22.02 percent, 14.74 percent of rough polished concentrate TFe and TiO2 5.00％。
Comparative example 2
The oversize product of the second stage of concentrate screening in rough polishing in example 1 was fed into a high pressure roller mill together with the concentrate roughed by the magnetic pulley, and since the oversize product was not screened, the throughput of the roller mill was 350t/h, and the total crushing throughput was only 350 tons. And after the ore is sieved by 5mm, 60 percent of undersize products and 40 percent of oversize products are obtained, the oversize products are subjected to high-pressure roller milling, and the undersize products directly enter a magnetic separator for fine polishing. The yield of the roll mill was thus still 350t/h, but the total crushing increased to 500 t/h.
Claims (10)
1. The comprehensive utilization method of the low-grade vanadium titano-magnetite pre-concentration waste disposal is characterized by comprising the following steps: the method comprises the following steps: carrying out rough polishing and fine polishing on the low-grade vanadium titano-magnetite in sequence; wherein, the rough polishing includes in proper order: coarse crushing, medium crushing, first-stage screening, fine crushing, magnetic pulley coarse separation, gravity magnetic pulling and scavenging and second-stage screening; finely throw and include in proper order: and the third stage of screening, rolling and grinding for superfine crushing, and magnetic separation for fine polishing.
2. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to claim 1, characterized in that: the grain size of the material obtained after coarse crushing is less than or equal to 150 mm; preferably 100 mm.
3. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to claim 1 or 2, characterized in that: the particle size of the material obtained after the middle breaking is less than or equal to 80 mm; preferably 50 mm.
4. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to any one of claims 1 to 3, characterized in that: in the first stage of screening, coarse fraction materials which are screened to be larger than or equal to 25mm are subjected to fine crushing through conical crushing, and fine crushed products enter screening to form closed cycle; furthermore, the grain size of the fine-fraction material after the first stage of screening is less than or equal to 25 mm.
5. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to any one of claims 1 to 4, characterized in that: coarsely selecting the screened fine-grained materials through a magnetic pulley, wherein the field intensity is 0.2-0.3T, and when TFe is less than or equal to 10 wt%, TiO is2Less than or equal to 3.5 wt%, and performing gravity magnetic scavenging on the tailings after the rough concentration of the magnetic pulley.
6. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to any one of claims 1 to 5, characterized in that: after the scavenging concentrate is classified by a vibrating screen, the screen hole of the vibrating screen is 1-3 mm, and oversize products with the particle size of 1-25 mm and the concentrate roughly selected by a magnetic pulley are combined and enter a fine polishing process; grading scavenged tailings by a vibrating screen, wherein screen holes are 0.5-2 mm, and grading oversize materials into broken stones and gravels; and combining the undersize and the undersize of the scavenging concentrate into a fine throwing flow.
7. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to any one of claims 1 to 6, characterized in that: and in the third stage of screening, the coarsely thrown concentrate is classified by a vibrating screen, screen holes are 3-8 mm, undersize materials enter a magnetic separator, and oversize materials enter a rolling mill.
8. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to any one of claims 1 to 7, characterized in that: and the rolling mill superfine crushing is to feed oversize materials into a rolling mill for superfine crushing, and the crushed product enters a third section for screening to form closed cycle.
9. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to any one of claims 1 to 8, characterized in that: and in the magnetic fine throwing, undersize materials of the second and third section sieves are fed into a magnetic separator, the field intensity of the magnetic separator is 0.35-0.55T, fine throwing is carried out to obtain a concentrate product, and an iron removing system is adopted.
10. The low-grade vanadium titano-magnetite preselection and waste disposal comprehensive utilization method according to any one of claims 1 to 9, characterized in that: and after the tailings subjected to magnetic separation and fine polishing are classified by a sieve with 1 mm-14 mm sieve pores, the undersize product is removed to a titanium separation system, and the oversize product is a sandstone product.
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| CN115501964A (en) * | 2022-09-23 | 2022-12-23 | 中钢设备有限公司 | Dry-wet separation method for superfine crushing and coarse-fine grading of low-grade magnetite |
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