CN117960413A - Deep quality improvement method for vanadium-titanium-iron concentrate - Google Patents
Deep quality improvement method for vanadium-titanium-iron concentrate Download PDFInfo
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- CN117960413A CN117960413A CN202311370958.5A CN202311370958A CN117960413A CN 117960413 A CN117960413 A CN 117960413A CN 202311370958 A CN202311370958 A CN 202311370958A CN 117960413 A CN117960413 A CN 117960413A
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- 239000012141 concentrate Substances 0.000 title claims abstract description 151
- MRHSJWPXCLEHNI-UHFFFAOYSA-N [Ti].[V].[Fe] Chemical compound [Ti].[V].[Fe] MRHSJWPXCLEHNI-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000000227 grinding Methods 0.000 claims abstract description 60
- 238000012216 screening Methods 0.000 claims abstract description 54
- 239000004576 sand Substances 0.000 claims abstract description 36
- 230000002000 scavenging effect Effects 0.000 claims description 28
- 239000006148 magnetic separator Substances 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 11
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 239000000203 mixture Substances 0.000 description 14
- 238000007885 magnetic separation Methods 0.000 description 13
- 235000013339 cereals Nutrition 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 11
- 239000000126 substance Substances 0.000 description 8
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000001238 wet grinding Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 235000011868 grain product Nutrition 0.000 description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 3
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910001608 iron mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The disclosure provides a method for deeply upgrading vanadium-titanium-iron concentrate, which comprises the following steps: screening vanadium-titanium-iron concentrate, grinding and swirling the obtained first oversize material to obtain first overflow and first sand setting, upgrading and roughing the obtained first undersize material to obtain first concentrate and first tailings, and screening the first concentrate to obtain second oversize material and second undersize material; screening the first overflow to obtain a third undersize material and a third oversize material, and swirling the second undersize material to obtain a second overflow and second sand setting; grinding and swirling the second oversize material, the third oversize material and the second overflow to obtain third overflow and third settled sand, carrying out quality improvement on the third overflow to obtain third concentrate and third tailings, and carrying out quality improvement on the third undersize material to obtain second concentrate and second tailings; and carrying out quality improvement and concentration operation on the second concentrate, the third concentrate and the second sand setting to obtain concentrate and tailings. The TFe grade of vanadium-titanium-iron concentrate is effectively improved.
Description
Technical Field
The disclosure relates to the field of vanadium-titanium-iron ore separation processes, in particular to a method for deeply upgrading vanadium-titanium-iron concentrate.
Background
The Panxi area of China has rich vanadium titano-magnetite resources, but is influenced by ore forming conditions, and the TFe grade of vanadium-titanium iron concentrate produced by adopting Panxi vanadium titano-magnetite as a raw material and adopting two-stage ore grinding and sorting is only 53-56% (influenced by ore areas) which is obviously lower than that of iron concentrate produced by common iron ore.
The smelting industry provides a demand for improving the TFe grade of vanadium-titanium-iron concentrate for the front-end ore dressing industry, and the quality improvement of the vanadium-titanium-iron concentrate becomes a necessary path for future development of Panxi vanadium-titanium magnetite ore dressing enterprises. However, the enterprises for upgrading the vanadium-titanium-iron concentrate generally adopt a process of classification, tower grinding and magnetic separation to upgrade the vanadium-titanium-iron concentrate, the TFe grade of the upgraded vanadium-titanium-iron concentrate can reach 55% -58% (influenced by a mining area), and due to the adopted process of 'pre-classification-coarse grain regrinding classification-classified fine grain combined magnetic separation', coarse-grain gangue and lean conjoined gangue are discharged and mixed into a fine particle grade along with overflow due to lighter specific gravity in the classification and grinding processes, and are not effectively ground and dissociated, so that more coarse-grain gangue and gangue are still in the upgraded vanadium-titanium-iron concentrate, the lean conjoined is still in the TFe grade, the upgrading amplitude is not large, and part of enterprises adopt a method for increasing grinding for fully decomposing the gangue, so that the grinding cost is increased, the granularity of the upgraded vanadium-iron concentrate is also finer, serious adverse effects are brought to the filtration of the rear-end upgraded iron concentrate, and the comprehensive upgrading cost is greatly increased.
Accordingly, the prior art is in need of improvement.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for deeply upgrading vanadium-titanium-iron concentrate, which optimizes the granularity composition of the upgraded concentrate by reducing the grinding total amount of upgraded grinding, effectively solves the problem that coarse gangue is mixed into the upgraded concentrate, reduces the content of gangue intergrowth in the upgraded concentrate, further improves the TFe grade of the upgraded iron concentrate, solves the problem of filtration of the upgraded concentrate, and reduces the comprehensive cost of upgrading.
In order to solve the technical problems, the invention adopts the following technical scheme:
According to aspects of the invention, there is provided a method for deep upgrading of vanadium-titanium-iron concentrate, comprising the steps of:
1) Performing a first screening operation on the vanadium-titanium-iron concentrate to obtain a first oversize product and a first undersize product;
2) Carrying out first cyclone operation after carrying out first section grinding operation on the first oversize product to obtain first overflow and first sand setting, carrying out first upgrading roughing operation on the first undersize product to obtain first concentrate and first tailings, and carrying out second screening operation on the first concentrate to obtain second oversize product and second undersize product;
3) Performing third screening operation on the first overflow to obtain a third undersize product and a third oversize product, and performing second rotational flow operation on the second undersize product to obtain a second overflow and second sand setting;
4) Mixing the second oversize product, the third oversize product and the second overflow to perform second-stage ore grinding operation, performing third rotational flow operation to obtain third overflow and third sand setting, performing third upgrading roughing operation on the third overflow to obtain third concentrate and third tailings, and performing second upgrading roughing operation on the third undersize product to obtain second concentrate and second tailings;
5) The second concentrate and the third concentrate are mixed and then subjected to upgrading and concentration operation after being mixed with the second sand setting so as to obtain concentrate and tailings, and the first tailings, the second tailings, the third tailings and the tailings are mixed and then subjected to upgrading and scavenging operation so as to obtain scavenging concentrate and scavenging tailings.
In one embodiment of the present invention, in step 2) further comprises: and carrying out a section of ore grinding operation on the first sand deposit to obtain a first overflow.
In one embodiment of the present invention, in step 4), the second stage grinding operation is further performed on the third grit to obtain a third overflow.
In one embodiment of the invention, in step 1), the vanadium-titanium-iron concentrate is subjected to a demagnetizing operation and then subjected to a first screening operation; in the step 2), the first concentrate is demagnetized and then subjected to the second screening operation; in the step 5), the second concentrate and the third concentrate are mixed, demagnetized and mixed with the second sand setting.
In one embodiment of the invention, the mesh apertures of the first screening operation, the second screening operation and the third screening operation are 0.1mm, 0.074mm and 0.074mm, respectively.
In one embodiment of the invention, the grinding concentration of the primary grinding operation and the secondary grinding operation is 60% -70% and 50% -60%, respectively; the grinding fineness of the first-stage grinding operation and the second-stage grinding operation is respectively more than 90% of-200 meshes and more than 90% of-325 meshes.
In one embodiment of the present invention, the first swirling operation has a swirling fineness of-325 mesh at least 90%, and the second swirling operation and the third swirling operation each have a swirling fineness of-325 mesh at least 95%.
In one embodiment of the invention, the magnetic field strength of the first upgrading roughing operation, the second upgrading roughing operation and the third upgrading roughing operation is 3000-3500Oe, the magnetic field strength of the upgrading selecting operation is 1300-1700Oe, and the magnetic field strength of the scavenging operation is 2300-2700Oe.
In one embodiment of the invention, the first screening operation, the second screening operation and the third screening operation all adopt high-frequency vibration screening machines, the first cyclone operation, the second cyclone operation and the third cyclone operation all adopt cyclones, the first section grinding operation and the second section grinding operation all adopt vertical stirring ball mills, the first quality-improving roughing operation, the second quality-improving roughing operation and the third quality-improving roughing operation all adopt roller magnetic separators, and the quality-improving carefully selecting operation and the scavenging operation all adopt high-frequency harmonic magnetic separators.
In one embodiment of the invention, the demagnetizing operation employs a high frequency pulse demagnetizer.
By adopting the technical scheme, compared with the prior art, the invention has the following advantages:
1. TFe grade of vanadium-titanium-iron concentrate is improved from 53.25% -56% to 56.48% -59.40%, and the improvement range reaches 3.23-3.40%;
2. The quality improvement and roughing of coarse grains on the sieve are more uniform in ore feeding granularity, coarse grain gangue is removed, the problem of gangue in the quality improvement product is effectively relieved, coarse grain gangue in fine-fraction magnetic concentrate is removed by the undersize fine grain product, and the intergrowth content of the fine grain gangue is reduced;
3. For the continuous bodies of coarse gangue and fine gangue, the dissociation degree of gangue and useful minerals is further improved, the recovery rate in the upgrading process is increased, and the content of continuous bodies of gangue in the subsequent concentrate is reduced; for concentrate products, the monomer and lean intergrowth gangue mixed in the concentrate are further reduced, and the TFe grade of the concentrate is improved;
4. The tailing products are subjected to concentrated scavenging operation, so that the loss of metal iron minerals in the tailings is further reduced, and the recovery rate of iron resources is improved
Drawings
FIG. 1 shows a flow chart of a method for deeply upgrading vanadium-titanium-iron concentrate provided by the invention;
Fig. 2 shows a schematic flow chart of a method for deeply upgrading vanadium-titanium-iron concentrate provided by the embodiment of the invention.
Detailed Description
It should be understood that the embodiments of the invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art will readily appreciate that many modifications are possible without materially departing from the teachings of the subject matter of this disclosure. Accordingly, all such modifications are intended to be included within the scope of present invention. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and parameters of the exemplary embodiments without departing from the spirit of the present inventions.
As shown in fig. 1, the invention provides a method for deeply upgrading vanadium-titanium-iron concentrate, which comprises the following steps:
Step S101: performing a first screening operation on the vanadium-titanium-iron concentrate to obtain a first oversize product and a first undersize product;
Step S102: carrying out first cyclone operation after carrying out first section grinding operation on the first oversize product to obtain first overflow and first sand setting, carrying out first upgrading roughing operation on the first undersize product to obtain first concentrate and first tailings, and carrying out second screening operation on the first concentrate to obtain second oversize product and second undersize product;
Step S103, performing third screening operation on the first overflow to obtain a third undersize product and a third oversize product, and performing second rotational flow operation on the second undersize product to obtain a second overflow and second sand setting;
Step S104, mixing the second oversize product, the third oversize product and the second overflow to perform second-stage ore grinding operation, performing third rotational flow operation to obtain third overflow and third sand setting, performing third upgrading roughing operation on the third overflow to obtain third concentrate and third tailings, and performing second upgrading roughing operation on the third undersize product to obtain second concentrate and second tailings;
And step 105, mixing the second concentrate and the third concentrate with the second sand, then carrying out upgrading and concentrating operation to obtain concentrate and tailings, and mixing the first tailings, the second tailings, the third tailings and the tailings, then carrying out upgrading and scavenging operation to obtain scavenging concentrate and scavenging tailings.
According to the technical scheme, the total grinding amount of the upgraded grinding is reduced, the granularity composition of the upgraded concentrate is optimized, the problem that coarse gangue is mixed into the upgraded concentrate is effectively solved, the content of gangue intergrowth in the upgraded concentrate is reduced, the TFe grade of the upgraded iron concentrate is further improved, the problem of filtration of the upgraded concentrate is solved, and the comprehensive cost of upgrading is reduced.
In the above method, in step S102, further includes: and carrying out a section of ore grinding operation on the first sand deposit to obtain a first overflow.
In the above method, in step S104, the second stage grinding operation is further performed on the third sand to obtain a third overflow.
In the method, in the step S101, the vanadium-titanium-iron concentrate is demagnetized and then subjected to first screening operation; in step S102, the first concentrate is demagnetized and then subjected to second screening operation; in step S105, the second concentrate and the third concentrate are mixed, demagnetized, and mixed with the second sand setting.
In the above method, the mesh diameters of the first screening operation, the second screening operation and the third screening operation are 0.1mm, 0.074mm and 0.074mm, respectively.
In the method, the grinding concentration of the primary grinding operation and the secondary grinding operation is respectively 60-70% and 50-60%; the grinding fineness of the first-stage grinding operation and the second-stage grinding operation is respectively more than 90% of-200 meshes and more than 90% of-325 meshes.
In the method, the rotational flow fineness of the first rotational flow operation is more than minus 325 meshes and accounts for 90 percent, and the rotational flow fineness of the second rotational flow operation and the third rotational flow operation is more than minus 325 meshes and accounts for 95 percent.
In the method, the magnetic field intensity of the first upgrading roughing operation, the second upgrading roughing operation and the third upgrading roughing operation is 3000-3500Oe, the magnetic field intensity of the upgrading selecting operation is 1300-1700Oe, and the magnetic field intensity of the scavenging operation is 2300-2700Oe.
In the method, the first screening operation, the second screening operation and the third screening operation all adopt high-frequency vibration screening machines, the first cyclone operation, the second cyclone operation and the third cyclone operation all adopt cyclones, the first-stage ore grinding operation and the second-stage ore grinding operation all adopt vertical stirring ball mills, the first upgrading roughing operation, the second upgrading roughing operation and the third upgrading roughing operation all adopt roller magnetic separators, and the upgrading selection operation and the scavenging operation all adopt high-frequency harmonic magnetic separators.
In the above method, the demagnetizing operation employs a high-frequency pulse demagnetizer.
The above technical solution of the present invention will be described in detail by a specific embodiment with reference to fig. 2.
Example 1
The vanadium-titanium-iron concentrate sample is from Panzhihua rice Yi certain vanadium-titanium-iron concentrate manufacturing enterprises, and the chemical compositions are shown in Table 1.
Table 1 example 1 analysis of chemical composition of vanadium-titanium-iron concentrate sample/%
The implementation steps are as follows:
firstly, uniformly mixing the vanadium-titanium-iron concentrate sample, then, demagnetizing by a high-frequency pulse demagnetizer, and then, carrying out high-frequency screening classification on the demagnetized vanadium-titanium-iron concentrate sample by a high-frequency vibration screening machine with the mesh size of 0.1mm to obtain coarse-grained vanadium-titanium-iron concentrate of an oversize material I with the size of +0.1mm and fine-grained vanadium-titanium-iron concentrate of an undersize material I with the size of-0.1 mm;
Secondly, carrying out quality improvement and roughing on minus 0.1mm undersize I fine-grade vanadium-titanium-iron concentrate by adopting a roller magnetic separator with a magnetic field strength of 3000Oe to obtain concentrate I and tailings I, carrying out high-frequency screening classification on concentrate I by adopting a high-frequency pulse demagnetizer and then adopting a high-frequency vibration screening machine with a screen mesh size of 0.074mm to obtain plus 0.074mm oversize II and minus 0.074mm undersize II, and carrying out cyclone classification on minus 0.074mm undersize II by adopting a high-efficiency cyclone to obtain overflow II and settled sand II, wherein the fineness of the overflow II is minus 325 meshes and accounts for 95.33%; adding oversize material I with the diameter of +0.1mm into an vertical stirring ball mill for wet grinding, controlling the grinding concentration to be 65%, enabling the fineness of a ground product to be-200 meshes to account for 90.82%, classifying the ground product by using a high-efficiency cyclone to obtain overflow I and sand setting I, controlling the overflow granularity to be-325 meshes to account for 91.03%, and returning the sand setting I to the vertical stirring ball mill for secondary grinding;
Carrying out high-frequency screening classification on overflow I by using a high-frequency vibration screening machine with the screen mesh size of 0.074mm to obtain an oversize material III with the screen size of +0.074mm and an undersize material III with the screen size of-0.074 mm, and carrying out quality improvement rough concentration II on the undersize material III by using a roller magnetic separator with the magnetic field strength of 3000Oe to obtain concentrate II and tailings II; mixing the oversize material II with the diameter of +0.074mm, the overflow II and the oversize material III with the diameter of +0.074mm, adding the mixture into an vertical stirring ball mill for wet grinding, controlling the grinding concentration to be 55%, and classifying the ground product by using a high-efficiency cyclone to obtain the overflow III and the sand setting III, wherein the overflow granularity is controlled to be 94.87% with-325 meshes;
Returning the settled sand III to an vertical stirring ball mill for re-grinding, and carrying out quality improvement and rough concentration III on the overflow III by using a drum magnetic separator with the magnetic field strength of 3000Oe to obtain concentrate III and tailings III; the concentrate II and the concentrate III obtained in the previous step are mixed and then demagnetized by a high-frequency pulse demagnetizer, and then mixed with the settled sand II, and then upgraded and carefully selected by a high-frequency harmonic magnetic separator with the magnetic field strength of 1500Oe, so as to obtain carefully selected concentrate and carefully selected tailings, wherein the carefully selected concentrate is used as upgraded vanadium-titanium-iron concentrate;
And mixing the concentrating tailings with the tailings I, II and III obtained above, and carrying out quality improvement scavenging on the mixture by a high-frequency harmonic magnetic separator with the magnetic field strength of 2500Oe to obtain scavenging concentrate and scavenging tailings, wherein the scavenging concentrate is used as secondary iron concentrate, and the scavenging tailings are used as quality improvement tailings.
The chemical composition analysis results of the finally obtained upgraded vanadium-titanium iron concentrate, secondary iron concentrate and upgraded tailings of example 1 are shown in table 2 below.
Table 2 example 1 analysis of chemical composition of upgraded vanadium-titanium-iron concentrate/%
Example 2
The vanadium-titanium-iron concentrate sample is from a Panzhihua certain vanadium-titanium-iron concentrate production enterprise, and the chemical composition is shown in the following table 3.
TABLE 3 analysis of chemical composition of samples of vanadium-titanium-iron concentrate example 2/%
The implementation steps are as follows:
firstly, uniformly mixing the vanadium-titanium-iron concentrate sample, then, demagnetizing by a high-frequency pulse demagnetizer, and then, carrying out high-frequency screening classification on the demagnetized vanadium-titanium-iron concentrate sample by a high-frequency vibration screening machine with the mesh size of 0.1mm to obtain coarse-grained vanadium-titanium-iron concentrate of an oversize material I with the size of +0.1mm and fine-grained vanadium-titanium-iron concentrate of an undersize material I with the size of-0.1 mm;
Secondly, carrying out quality improvement and roughing on minus 0.1mm undersize I fine-grade vanadium-titanium-iron concentrate by adopting a roller magnetic separator with a magnetic field strength of 3000Oe to obtain concentrate I and tailings I, carrying out high-frequency screening classification on concentrate I by adopting a high-frequency pulse demagnetizer and then adopting a high-frequency vibration screening machine with a screen mesh size of 0.074mm to obtain plus 0.074mm oversize II and minus 0.074mm undersize II, and carrying out cyclone classification on minus 0.074mm undersize II by adopting a high-efficiency cyclone to obtain overflow II and settled sand II, wherein the fineness of the overflow II is minus 325 meshes and accounts for 96.06%; adding oversize material I with the diameter of +0.1mm into an vertical stirring ball mill for wet grinding, controlling the grinding concentration to be 65%, enabling the fineness of a ground product to be 91.25% in terms of 200 meshes, classifying the ground product by using a high-efficiency cyclone to obtain overflow I and sand setting I, controlling the overflow granularity to be 90.67% in terms of 325 meshes, and returning the sand setting I to the vertical stirring ball mill for secondary grinding;
Carrying out high-frequency screening classification on overflow I by using a high-frequency vibration screening machine with the screen mesh size of 0.074mm to obtain an oversize material III with the screen size of +0.074mm and an undersize material III with the screen size of-0.074 mm, and carrying out quality improvement rough concentration II on the undersize material III by using a roller magnetic separator with the magnetic field strength of 3000Oe to obtain concentrate II and tailings II; mixing the oversize material II with the diameter of +0.074mm, the overflow II and the oversize material III with the diameter of +0.074mm, adding the mixture into an vertical stirring ball mill for wet grinding, and grading the ground product by using a high-efficiency cyclone to obtain overflow III and settled sand III, wherein the overflow granularity is controlled to be-325 meshes to be 95.64%; returning the settled sand III to an vertical stirring ball mill for re-grinding, and carrying out quality improvement and rough concentration III on the overflow III by using a drum magnetic separator with the magnetic field strength of 3000Oe to obtain concentrate III and tailings III;
Mixing the concentrate II and the concentrate III obtained in the previous step, demagnetizing by a high-frequency pulse demagnetizer, mixing with the settled sand II, and carrying out quality improvement and concentration by a high-frequency harmonic magnetic separator with the magnetic field strength of 1500Oe to obtain concentrate and tailings, wherein the concentrate is used as the quality improvement vanadium-titanium-iron concentrate; and mixing the concentrating tailings with the tailings I, II and III obtained above, and carrying out quality improvement scavenging on the mixture by a high-frequency harmonic magnetic separator with the magnetic field strength of 2500Oe to obtain scavenging concentrate and scavenging tailings, wherein the scavenging concentrate is used as secondary iron concentrate, and the scavenging tailings are used as quality improvement tailings.
The chemical composition analysis results of the finally obtained upgraded vanadium-titanium iron concentrate, secondary iron concentrate and upgraded tailings are shown in table 4 below.
Table 4 example 2 analysis results of chemical composition of upgraded vanadium-titanium-iron concentrate/%
The invention adopts the technological process of high-frequency demagnetizing-high-frequency screening classification (0.1 mm) -qualified fine fraction magnetic separation-fine fraction magnetic separation after two-stage classification after coarse grinding-coarse fraction magnetic separation concentrate demagnetizing-coarse fraction two-stage classification disqualification product to carry out second-stage grinding classification magnetic separation-coarse fraction magnetic separation concentrate, fine fraction magnetic separation classification sand setting, second-stage grinding magnetic separation concentrate demagnetizing and concentrating-concentrating tailings and roughing tailings mixed scavenging to finally obtain high-grade upgraded vanadium-titanium-iron concentrate with larger TFe grade improvement range, and the vanadium-titanium-iron concentrate grade is improved to 56.48% -59.40% from 53.25% -56%, and reaches 3.23% -3.40% percent.
According to the invention, after vanadium-titanium-iron concentrate before upgrading is screened by a high-frequency vibrating screen, the ore grinding classification flow of tower grinding, cyclone classification and high-frequency vibrating screening is adopted for coarse grain products on the screen, so that the ore feeding granularity of the upgraded coarse grain II is ensured to be more uniform, coarse grain gangue is removed, the problem of gangue contained in the upgraded products is effectively relieved, the flow of magnetic separation, high-frequency vibrating screening and cyclone classification is adopted for undersize fine grain products, coarse grain gangue in fine grain-level magnetic separation concentrate is removed, and the integral content of fine grain gangue is reduced.
According to the invention, a grinding and selecting process of tower grinding, cyclone grading and magnetic separation is adopted for coarse gangue and fine gangue intergrowth separated by a high-frequency vibrating screen and a high-efficiency cyclone, so that the dissociation degree of the gangue and useful minerals is further improved, the recovery rate in the upgrading process is increased, and the content of the gangue intergrowth in the subsequent concentrate is reduced; and (3) concentrating the concentrate product obtained by rough concentration and magnetic separation by adopting a high-frequency harmonic magnetic separator after demagnetization, so that the monomer and lean intergrowth gangue mixed in the concentrate can be further reduced, and the TFe grade of the upgraded concentrate can be improved.
The invention intensively carries out scavenging operation energy on the tailing products obtained by rough concentration magnetic separation and fine concentration magnetic separation, further reduces the loss of metal iron minerals in the tailings and improves the recovery rate of iron resources.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention; modifications and equivalent substitutions are intended to be included in the scope of the claims without departing from the spirit and scope of the present invention.
Claims (10)
1. The deep quality improvement method for vanadium-titanium-iron concentrate is characterized by comprising the following steps of:
1) Performing a first screening operation on the vanadium-titanium-iron concentrate to obtain a first oversize product and a first undersize product;
2) Carrying out first cyclone operation after carrying out first section ore grinding operation on the first oversize product to obtain first overflow and first sand setting, carrying out first upgrading roughing operation on the first undersize product to obtain first concentrate and first tailings, and carrying out second screening operation on the first concentrate to obtain second oversize product and second undersize product;
3) Performing a third screening operation on the first overflow to obtain a third undersize product and a third oversize product, and performing a second rotational flow operation on the second undersize product to obtain a second overflow and a second sand setting;
4) Mixing the second oversize product, the third oversize product and the second overflow to perform two-stage ore grinding operation, performing third rotational flow operation to obtain third overflow and third sand setting, performing third upgrading roughing operation on the third overflow to obtain third concentrate and third tailings, and performing second upgrading roughing operation on the third undersize product to obtain second concentrate and second tailings;
5) And mixing the second concentrate and the third concentrate and then mixing the second concentrate and the second sand to perform upgrading and concentration operation so as to obtain concentrate and tailings, and mixing the first tailings, the second tailings, the third tailings and the tailings to perform upgrading and scavenging operation so as to obtain scavenging concentrate and scavenging tailings.
2. The method for deep upgrading of vanadium-titanium-iron concentrate according to claim 1, further comprising in step 2): and carrying out a section of ore grinding operation on the first sand setting to obtain the first overflow.
3. The method of deep upgrading of vanadium-titanium-iron concentrate according to claim 1, further comprising, in step 4), performing a two-stage grinding operation on the third grit to obtain the third overflow.
4. The method for deeply upgrading vanadium-titanium-iron concentrate according to claim 1, wherein the first screening operation is performed after the demagnetizing operation is performed on the vanadium-titanium-iron concentrate in the step 1); in the step 2), the first concentrate is demagnetized and then subjected to second screening operation; and in the step 5), the second concentrate and the third concentrate are mixed, demagnetized and mixed with the second sand setting.
5. The method for deep upgrading of vanadium-titanium-iron concentrate according to claim 1, wherein the mesh sizes of the first screening operation, the second screening operation and the third screening operation are 0.1mm, 0.074mm and 0.074mm, respectively.
6. The method for deeply upgrading vanadium-titanium-iron concentrate according to claim 1, wherein the grinding concentration of the primary grinding operation and the secondary grinding operation is 60% -70% and 50% -60%, respectively; the grinding fineness of the first-stage grinding operation and the second-stage grinding operation is respectively more than 90% of-200 meshes and more than 90% of-325 meshes.
7. The method for deeply upgrading vanadium-titanium-iron concentrate according to claim 1, wherein the cyclone fineness of the first cyclone operation is more than 90% in terms of 325 mesh, and the cyclone fineness of the second cyclone operation and the third cyclone operation is more than 95% in terms of 325 mesh.
8. The method for deep upgrading of vanadium-titanium-iron concentrate according to claim 1, wherein the magnetic field intensity of the first upgrading roughing operation, the second upgrading roughing operation and the third upgrading roughing operation is 3000-3500Oe, the magnetic field intensity of the upgrading beneficiating operation is 1300-1700Oe, and the magnetic field intensity of the scavenging operation is 2300-2700Oe.
9. The method for deeply upgrading vanadium-titanium-iron concentrate according to claim 1, wherein the first screening operation, the second screening operation and the third screening operation all adopt high-frequency vibration screening machines, the first cyclone operation, the second cyclone operation and the third cyclone operation all adopt cyclones, the first-stage ore grinding operation and the second-stage ore grinding operation all adopt vertical stirring ball mills, the first upgrading roughing operation, the second upgrading roughing operation and the third upgrading roughing operation all adopt roller magnetic separators, and the upgrading carefully selecting operation and the scavenging operation all adopt high-frequency harmonic magnetic separators.
10. The method for deeply upgrading vanadium-titanium-iron concentrate according to claim 4, wherein the demagnetizing operation adopts a high-frequency pulse demagnetizer.
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