CN114054204A - Method for improving quality, reducing titanium and reducing sulfur of Panxi ilmenite concentrate - Google Patents
Method for improving quality, reducing titanium and reducing sulfur of Panxi ilmenite concentrate Download PDFInfo
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- CN114054204A CN114054204A CN202111347143.6A CN202111347143A CN114054204A CN 114054204 A CN114054204 A CN 114054204A CN 202111347143 A CN202111347143 A CN 202111347143A CN 114054204 A CN114054204 A CN 114054204A
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- 239000012141 concentrate Substances 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 44
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 21
- 239000010936 titanium Substances 0.000 title claims abstract description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 15
- 239000011593 sulfur Substances 0.000 title claims abstract description 15
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 14
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 title claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 124
- 229910052742 iron Inorganic materials 0.000 claims abstract description 63
- 238000000227 grinding Methods 0.000 claims abstract description 40
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000007885 magnetic separation Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 230000002000 scavenging effect Effects 0.000 claims description 28
- 229910052720 vanadium Inorganic materials 0.000 claims description 10
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 10
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 8
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000010408 sweeping Methods 0.000 abstract 1
- 238000000498 ball milling Methods 0.000 description 13
- 239000006148 magnetic separator Substances 0.000 description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 229910001037 White iron Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000010334 sieve classification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
- B02C17/10—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 with one or a few disintegrating members arranged in the container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
-
- 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
Abstract
The invention provides a method for quality improvement and production of high-iron low-titanium low-sulfur vanadium-titanium magnetite concentrate, which comprises the following steps: preparing iron ore concentrate obtained by two-stage ore grinding-magnetic separation in Panxi area into ore pulp; conveying the ore pulp to ore grinding equipment (stirring mill) for grinding; and (3) carrying out iron separation on the finely ground iron concentrate through a primary-coarse-fine-sweeping magnetic separation process to obtain a fine iron concentrate. The iron ore concentrate prepared by the method provided by the invention has high taste and low titanium and sulfur contents.
Description
Technical Field
The invention belongs to the technical field of beneficiation of Panxi vanadium titano-magnetite, and particularly relates to a method for improving quality, reducing titanium and reducing sulfur of Panxi titano-magnetite concentrate, in particular to a method for improving quality, reducing titanium and reducing sulfur by fine grinding-magnetic separation.
Background
At present, Panzhihua-Xichang area vanadium titano-magnetite has rich reserves which are proved to reach more than 100 hundred million tons. But because of the characteristics of the deposit in the Panzhihua mining area, the grade of the selected iron ore concentrate has low iron grade, and TiO has low grade2High grade. TiO 22And is a harmful component in the blast furnace ironmaking process, generally causes the increase of slag viscosity, difficult slag-iron separation and the increase of blast furnace iron lossAnd the cost of ton iron fuel is increased, and foam slag can be generated in severe cases, so that iron removal is difficult and safety risk exists. Therefore, the quality improvement and impurity reduction of the iron ore concentrate, particularly the quality improvement and titanium reduction of the Panxi iron ore concentrate, is an important direction of the Panxi vanadium titano-magnetite. At present, the ore dressing process of Panzhihua vanadium-titanium magnetite needs to be carried out by grinding and grading, two-stage grinding and sorting are usually adopted for iron dressing, the first stage grinding is carried out until 45 percent of minus 200 meshes, and the magnetic field intensity is 1800-2500 oersted magnetic dressing; the second stage of grinding to about 55% -80% of-200 meshes, magnetic separation is carried out under the magnetic field strength of 1300-1800 oersted, both the two stages of grinding adopt ball mills, the granularity distribution after grinding is uneven, the grinding is dumbbell-shaped, the grade of the iron ore concentrate is difficult to be improved to more than 57% under the condition that the grade of the raw ore is higher than 27% (the grade of the raw ore of the Panzhihua-Xichang large-scale ore dressing plant is usually 27-33%, the grade of the produced iron ore concentrate such as Panzhi steel, Longdao and Taihe is 54-56%), and the high-grade titanium magnetite concentrate is difficult to be obtained by adopting 22-27% of the raw ore of the Panzhihua ore area.
Disclosure of Invention
In view of the above, the invention aims to provide a method for improving quality, reducing titanium and reducing sulfur of Panxi ilmenite concentrates, and the method provided by the invention can be used for preparing high-grade vanadium-titanium magnetite concentrates (TFe is more than or equal to 60%) and reducing titanium and sulfur.
The invention provides a method for improving quality, reducing titanium and reducing sulfur of Panxi titanium magnetite concentrate, which comprises the following steps:
preparing iron ore concentrate into ore pulp;
grinding the ore pulp to obtain fine ground iron concentrate;
and carrying out rough concentration, fine concentration and scavenging on the fine ground iron concentrate in sequence to carry out iron concentration, thus obtaining fine concentrated iron concentrate.
Preferably, the iron ore concentrate is prepared by carrying out secondary grinding and magnetic separation on vanadium-titanium magnetite in Panxi area.
Preferably, the mass concentration of the ore pulp is 30-55%.
Preferably, the grinding medium is ceramic balls or zirconium balls.
Preferably, the granularity of the ore grinding medium is 2.5 mm-5.5 mm.
Preferably, the stirring speed in the ore grinding process is 240-320 revolutions per minute.
Preferably, the particle size of the finely ground iron concentrate is D90 < 35 μm.
Preferably, the magnetic separation intensity of the rough separation is 1600-2000 oersted.
Preferably, the magnetic separation intensity of the concentration is 1300-1700 oersted.
Preferably, the magnetic separation intensity of the scavenging is 1800-2200 oersted.
In the process of improving quality and reducing impurities of Panxi iron ore concentrate, TiO is involved2The change rule is rarely reported, the fine grinding and magnetic separation are carried out in the two-stage or three-stage grinding and separating process, the grade of iron ore concentrate is improved while the grade of iron ore concentrate is basically kept unchanged or even slightly improved, mainly because the high-titanium-content guest crystal minerals (flaky ilmenite, ilmenite and the like) exist in the Panxi vanadium titano-magnetite particles, and the guest crystal minerals are difficult to dissociate in the grinding process, so that CaO, MgO and SiO in the quality improvement and impurity reduction process of the Panxi vanadium titano-magnetite are caused2、Al2O3More reduction which in turn leads to upgrading of TiO in the concentrate2There is an increasing trend. The main reason is that the existing process and equipment for processing Panzhihua vanadium titano-magnetite can not effectively dissociate or even partially dissociate the guest crystal minerals. The invention provides a process technology for producing high-grade vanadium-titanium magnetite concentrate (TFe is more than or equal to 60%) and simultaneously reducing titanium and sulfur by taking Panxi titanium magnetite concentrate as raw ore.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for improving quality, reducing titanium and reducing sulfur of Panxi titanium magnetite concentrate, which comprises the following steps:
preparing iron ore concentrate into ore pulp;
grinding the ore pulp to obtain fine ground iron concentrate;
and carrying out rough concentration, fine concentration and scavenging on the fine ground iron concentrate in sequence to carry out iron concentration, thus obtaining fine concentrated iron concentrate.
In the invention, the iron concentrate is preferably obtained by carrying out secondary grinding and magnetic separation on vanadium titano-magnetite in Panxi area.
In the present invention, the components of the iron concentrate preferably include:
54-56.5 wt% of TFe;
8-13 wt% of TiO2；
0.4 to 1 wt% of V2O5；
0.2-0.8 wt% CaO;
2.5 to 4.0 wt% of MgO;
2.0 to 5.0 wt% of SiO2；
2.5-4.8 wt% of Al2O3；
0.3 to 0.9 wt% of S.
In the invention, the mass content of TFe is preferably 55-56%, and more preferably 55.5%; the TiO is2The mass content of (A) is preferably 9-12%, more preferably 10-11%; the V is2O5The mass content of (b) is preferably 0.5 to 0.9%, more preferably 0.6 to 0.8%, most preferably 0.7%; the mass content of CaO is preferably 0.3-0.7%, more preferably 0.4-0.6%, and most preferably 0.5%; the mass content of MgO is preferably 3-3.5%, and more preferably 3.2-3.3%; the SiO2The mass content of (b) is preferably 3-4%, more preferably 3.5%; the Al is2O3The mass content of (b) is preferably 3 to 4.5%, more preferably 3.5 to 4%; the mass content of S is preferably 0.4 to 0.8%, more preferably 0.5 to 0.7%, and most preferably 0.6%.
In the invention, the mass content of the iron ore concentrate of-200 meshes is preferably 55-80%, more preferably 60-70%, and most preferably 65%.
In the present invention, the method for preparing the iron ore concentrate preferably includes:
crushing vanadium titano-magnetite, performing primary ball milling, and performing primary grading;
performing first-stage low-intensity magnetic separation on the classified fine-grained part to obtain first-stage iron-selecting rough concentrate;
performing secondary grading after performing secondary ball milling on the primary iron-selecting rough concentrate to obtain oversize products and undersize products;
performing two-stage primary weak magnetic concentration on the undersize to obtain first concentrate and first tailings;
performing secondary weak magnetic concentration on the first concentrate for two times to obtain a second concentrate and a second tailing;
mixing the first tailings and the second tailings, and then carrying out secondary scavenging to obtain scavenged concentrate;
and mixing the second concentrate and the scavenging concentrate to obtain iron concentrate.
In the invention, the crushing is preferably three-stage one-closed-circuit crushing, and the granularity of the crushing is preferably 10-15 mm, more preferably 11-14 mm, and most preferably 12-13 mm.
In the present invention, the primary classification is preferably a cyclone classification; the mesh number of the primary grading is preferably 180-220 meshes, more preferably 190-210 meshes, and most preferably 200 meshes.
In the present invention, the coarse fraction after the primary classification is preferably returned to a ball mill for ball milling again.
In the present invention, the fine fraction is preferably a-200 mesh mineral content of preferably 40 to 50% by weight, more preferably 43 to 47% by weight, most preferably 45% by weight.
In the invention, the magnetic field intensity of the one-stage weak magnetic separation is preferably 2800-3200 GS, more preferably 2900-3100 GS, and most preferably 3000 GS.
In the present invention, the secondary classification preferably includes:
and sequentially carrying out cyclone classification and high-frequency screen classification.
In the invention, the purpose of the cyclone classification is preferably 180-220 meshes, more preferably 190-210 meshes, and most preferably 200 meshes.
In the invention, the settled sand after the cyclone classification is preferably returned to the second-stage ball milling for ball milling again.
In the invention, the overflow after the cyclone classification enters a high-frequency sieve classification, and oversize products preferably return to the second-stage ball milling for ball milling again; and carrying out two-stage primary low-intensity magnetic separation on the undersize products.
In the invention, the magnetic field intensity of the two-stage primary low-intensity magnetic separation is preferably 1400-1600 GS, more preferably 1450-1550 GS, and most preferably 1500 GS.
In the invention, the magnetic field strength of the two-stage secondary low-intensity magnetic separation is preferably 1200-1400 GS, more preferably 1250-1230 GS, and most preferably 1300 GS.
In the invention, the magnetic field intensity of the scavenging is preferably 1400-1600 GS, more preferably 1450-1550 GS, and most preferably 1500 GS.
In the present invention, the method for preparing the iron ore concentrate more preferably comprises:
crushing raw ores (vanadium titano-magnetite) mined by a mining plant to 12mm through three sections and a closed circuit, performing first-section ball milling on the 12mm raw ores, classifying the ball-milled discharged ores into a cyclone according to 200 meshes, returning a coarse fraction to ball milling for regrinding, and feeding a fine fraction (-200 mass content about 45%) into a first-section weak magnetic separator (magnetic field intensity 3000GS) for iron separation to obtain first-section iron-separation coarse concentrate; the first-stage iron-separation rough concentrate enters a second-stage ball-milling ore grinding, the second-stage ball-milling ore discharge enters a second-stage cyclone for classification according to 200 meshes, the secondary cyclone sand setting returns to the second-stage ball-milling regrinding, the second-stage cyclone overflows into a second-stage high-frequency screen for classification, the minerals on the high-frequency screen return to the ball-milling regrinding, the minerals under the high-frequency screen enter a second-stage fine 1 weak magnetic separator (with the magnetic field intensity of 1500GS) to obtain fine 1 concentrate and fine 1 tailings, and the fine 1 concentrate is subjected to iron separation by a fine 2 weak magnetic separator (with the magnetic field intensity of 1300Gs) to obtain fine 2 concentrate and fine 2 tailings; mixing the fine 1 tailings and the fine 2 tailings, and then feeding the mixture into a two-stage scavenging low-intensity magnetic separator (with the magnetic field intensity of 1500Gs) to obtain scavenging concentrate and scavenging tailings; and mixing the concentrate of the concentrate 2 and the scavenging concentrate to obtain the iron concentrate.
In the invention, the iron ore concentrate is preferably prepared into ore pulp by adding water; the mass concentration of the ore pulp is preferably 30-55%, more preferably 35-50%, and most preferably 40-45%.
In the present invention, the grinding is preferably carried out in a stirred mill; the grinding medium is preferably ceramic balls or zirconium balls; the ceramic balls are preferably alumina balls; the granularity of the ore grinding medium is preferably 2.5-5.5 mm, more preferably 3-5 mm, and most preferably 4 mm; the stirring speed in the ore grinding process is preferably 240-320 rpm, more preferably 250-300 rpm, and most preferably 260-280 rpm.
In the present invention, the grinding is preferably carried out until (i.e. the resulting finely ground iron concentrate) D90 < 35 μm (i.e. a mesh size < 35 μm at 90% screen rating).
In the invention, the magnetic separation intensity of the rough separation is preferably 1600-2000 Oersted, more preferably 1700-1900 Oersted and most preferably 1800 Oersted.
In the invention, roughing concentrate and roughing tailings are obtained after the roughing;
and carrying out concentration on the roughed concentrate.
In the invention, the magnetic separation intensity of the concentration is preferably 1300-1700 oersted, more preferably 1400-1600 oersted, and most preferably 1500 oersted.
In the invention, after the concentration, a concentration concentrate and a concentration tailing are obtained.
In the present invention, it is preferred that the rougher tailings and the cleaner tailings are mixed and subjected to scavenging.
In the invention, the magnetic separation intensity of the scavenging is preferably 1800-2200 Oersted, more preferably 1900-2100 Oersted and most preferably 2000 Oersted.
In the invention, scavenged tailings are obtained after the scavenging; and mixing the concentrated concentrate and the scavenging tailings to obtain concentrated iron concentrate.
The method provided by the invention takes Panxi titanium magnetite concentrate as raw ore, and can prepare high-grade vanadium-titanium magnetite concentrate (TFe is more than or equal to 60%) and reduce titanium and sulfur.
Example 1
Grinding 1000t of iron ore concentrate obtained by secondary grinding in a Panzhihua white horse mining area until D90 is 21 mu m under the conditions that the mass concentration of grinding is 30%, ceramic balls (aluminum balls) with the size fraction of 2.5mm are used as grinding media, and the rotating speed of a stirring mill is 320 r/min, so as to obtain fine ground white horse iron ore concentrate;
the fine ground white horse iron concentrate is processed by a three-stage roughing weak magnetic separator (the magnetic field intensity is 1800GS) to obtain three-stage roughing concentrate and three-stage roughing tailings; separating the three-section roughing concentrates by a three-section concentration low-intensity magnetic separator (with the magnetic field intensity of 1500Gs) to obtain three-section concentration concentrates and three-section concentration tailings; mixing the three-section roughing tailings and the three-section concentrating tailings, and then feeding the mixture into a three-section scavenging weak magnetic separator (with the magnetic field intensity of 2000Gs) to obtain scavenging concentrate and scavenging tailings; and mixing the three-stage concentration concentrate and the scavenging concentrate to obtain the upgraded iron concentrate.
The iron ore concentrate method of the comparative example was: grinding the white horse second-stage iron ore concentrate to 90 percent of-200 meshes by a common ball mill, then obtaining third-stage rough concentration and third-stage rough tailings by a three-stage rough concentration low-intensity magnetic separator (the magnetic field intensity is 1800GS), and then separating the third-stage rough concentration by a three-stage fine concentration low-intensity magnetic separator (the magnetic field intensity is 1500Gs) to obtain third-stage fine concentration and third-stage fine tailings; mixing the three-section roughing tailings and the three-section concentrating tailings, and then feeding the mixture into a three-section scavenging weak magnetic separator (with the magnetic field intensity of 2000Gs) to obtain scavenging concentrate and scavenging tailings; and mixing the three-section concentration concentrate and the scavenging concentrate to obtain the upgraded iron concentrate.
GB/T6730.11-2007 is adopted to detect the content of aluminum element, YB/T4695-2018 is adopted to detect TFe and TiO2、V2O5、CaO、SiO2Content, GB/T6730.13-2007 tests the content of CaO and MgO, and the indexes of the product (iron ore concentrate) obtained in the embodiment 1 and the comparative example of the invention are as follows:
as can be seen from the test results, the TFe grade of the white iron concentrate can be improved from 56.44 percent to 60.00 percent by adopting the process parameters in the example 1 to carry out fine grinding-concentration, and the TiO content2The grade is reduced from 10.19 percent to 10.05 percent, and the S content is reduced from 0.37 percent to 0.23 percent; the comparative example is a process of concentration without grindingTFe grade is improved from 56.44% to 57.38%, TiO2Increasing from 10.19% to 10.25%, and decreasing sulfur from 0.37% to 0.33%; obviously, the fine grinding group (embodiment) has better quality improvement effect.
Example 2
Grinding 1000t of iron ore concentrate obtained by secondary grinding in a Panzhihua white horse mining area until D90 is 15 mu m under the conditions that the mass concentration of grinding is 45%, 3.0mm grain-size ceramic balls (aluminum balls) are used as grinding media and the rotating speed of a stirring grinder is 300 r/min, so as to obtain fine ground white horse ore concentrate;
the fine-ground white horse iron concentrate is subjected to three-section rough concentration and three-section rough concentration tailings by a three-section rough concentration low-intensity magnetic separator (the magnetic field intensity is 2000GS), and the three-section rough concentration is further subjected to three-section fine concentration low-intensity magnetic separator (the magnetic field intensity is 1500Gs) to obtain three-section fine concentration and three-section fine concentration tailings; mixing the three-section roughing tailings and the three-section concentrating tailings, and then feeding the mixture into a three-section scavenging weak magnetic separator (with the magnetic field intensity of 2200Gs), so as to obtain scavenging concentrate and scavenging tailings; and mixing the three-section concentration concentrate and the scavenging concentrate to obtain the upgraded iron concentrate.
The products obtained in example 2 and in the comparative example (iron ore concentrate) were tested according to the method of example 1, with the following indices:
as can be seen from the test results, the TFe grade of the white iron concentrate can be improved from 56.44 percent to 60.00 percent by adopting the process parameters in the example 2 to carry out fine grinding-concentration, and the TiO content2The grade is reduced from 10.19 percent to 10.09 percent, and the S content is reduced from 0.37 percent to 0.23 percent.
The method provided by the invention takes Panxi titanium magnetite concentrate as raw ore, and can prepare high-grade vanadium-titanium magnetite concentrate (TFe is more than or equal to 60%) and reduce titanium and sulfur.
While the invention has been described and illustrated with reference to specific embodiments thereof, such description and illustration are not intended to limit the invention. It will be clearly understood by those skilled in the art that various changes in form and details may be made therein without departing from the true spirit and scope of the invention as defined by the appended claims, to adapt a particular situation, material, composition of matter, substance, method or process to the objective, spirit and scope of this application. All such modifications are intended to be within the scope of the claims appended hereto. Although the methods disclosed herein have been described with reference to particular operations performed in a particular order, it should be understood that these operations may be combined, sub-divided, or reordered to form equivalent methods without departing from the teachings of the present disclosure. Accordingly, unless specifically indicated herein, the order and grouping of the operations is not a limitation of the present application.
Claims (10)
1. A method for improving quality, reducing titanium and reducing sulfur of Panxi ilmenite concentrate comprises the following steps:
preparing iron ore concentrate into ore pulp;
grinding the ore pulp to obtain fine ground iron concentrate;
and carrying out rough concentration, fine concentration and scavenging on the fine ground iron concentrate in sequence to carry out iron concentration, thus obtaining fine concentrated iron concentrate.
2. The method of claim 1, wherein the iron ore concentrate is prepared from vanadium titano-magnetite in Panxi region by secondary grinding and magnetic separation.
3. The method according to claim 1, characterized in that the pulp has a mass concentration of 30-55%.
4. The method of claim 1, wherein the grinding media are ceramic or zirconium balls.
5. The method according to claim 1, characterized in that the particle size of the grinding media is 2.5-5.5 mm.
6. The method according to claim 1, wherein the stirring speed during the ore grinding process is 240-320 rpm.
7. The method according to claim 1, characterized in that the particle size of the finely ground iron concentrate is D90 < 35 μm.
8. The method of claim 1, wherein the magnetic separation intensity of the roughing is 1600-2000 oersted.
9. The method of claim 1, wherein the concentration magnetic separation intensity is 1300-1700 oersted.
10. The method of claim 1, wherein the magnetic separation intensity of the scavenging is 1800 to 2200 oersteds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111347143.6A CN114054204A (en) | 2021-11-15 | 2021-11-15 | Method for improving quality, reducing titanium and reducing sulfur of Panxi ilmenite concentrate |
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| CN104437858A (en) * | 2014-11-24 | 2015-03-25 | 武汉中地西能科技有限公司 | Dephosphorizing method for high phosphorus magnetite ore |
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