CN116747997A - Method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic separation tailings and application of method - Google Patents
Method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic separation tailings and application of method Download PDFInfo
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- 239000012141 concentrate Substances 0.000 title claims abstract description 208
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 173
- 239000010936 titanium Substances 0.000 title claims abstract description 173
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 173
- 239000004576 sand Substances 0.000 title claims abstract description 102
- 229910052845 zircon Inorganic materials 0.000 title claims abstract description 101
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 238000007885 magnetic separation Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000002000 scavenging effect Effects 0.000 claims abstract description 140
- 230000005484 gravity Effects 0.000 claims abstract description 77
- 238000000926 separation method Methods 0.000 claims abstract description 52
- 238000002156 mixing Methods 0.000 claims abstract description 33
- 238000012216 screening Methods 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 54
- 239000000463 material Substances 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims description 6
- 239000002516 radical scavenger Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 abstract description 3
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 13
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 12
- 229960000907 methylthioninium chloride Drugs 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 238000001035 drying Methods 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 238000003825 pressing Methods 0.000 description 8
- 238000004537 pulping Methods 0.000 description 8
- 238000001179 sorption measurement Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 238000005363 electrowinning Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- 238000002835 absorbance Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 235000010215 titanium dioxide Nutrition 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 241001411320 Eriogonum inflatum Species 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000004408 titanium dioxide Substances 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910000365 copper sulfate Inorganic materials 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009854 hydrometallurgy Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012088 reference solution Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 150000003755 zirconium compounds Chemical class 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
-
- 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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
Abstract
The invention relates to the technical field of chemical solid waste treatment, in particular to a method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic separation tailings and application thereof. The reduced titanium magnetic separation tailings are subjected to screening, gravity concentration, roughing separation and magnetic separation roughing to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings; the magnetic separation roughing tailings are subjected to first scavenging to obtain primary scavenging concentrate and primary scavenging tailings; the first-stage scavenging concentrate is subjected to first electric concentration to obtain first-stage electric concentration concentrate and first-stage electric concentration tailings; the first-stage scavenging tailings are subjected to second scavenging to obtain second-stage scavenging concentrate and second-stage scavenging tailings, and the second-stage scavenging concentrate is subjected to second electric concentration to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings; and (5) the second-stage scavenging tailings are subjected to electric scavenging to obtain electric scavenging concentrate and electric scavenging tailings. Mixing the concentrates to obtain titanium concentrate; and mixing the first-stage electric separation tailings, the second-stage electric separation tailings and the electric separation tailings, and re-separating to obtain zircon sand. The method can recover titanium concentrate and zircon sand.
Description
Technical Field
The invention relates to the technical field of chemical solid waste treatment, in particular to a method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic separation tailings and application thereof.
Background
Reduced titanium refers to the product of ilmenite reduction at high temperature by gas-based or coal-based reduction conditions, which is a common method for treating ilmenite, enriching ferrotitanium, and producing a titanium-rich material. The reduced titanium is generally used as an intermediate product of the titanium-rich material, and can be used as a raw material for pyrometallurgy or hydrometallurgy to produce high-titanium slag or rutile titanium-rich material.
In addition to high-temperature reduction in the production process of the reduced titanium, the reduced titanium is separated from the reducing agent which is not fully reacted and the weak magnetic substances in the titanium concentrate by magnetic separation, wherein the magnetic concentrate obtained by magnetic separation of the reduced product is the reduced titanium, and the magnetic tailings mainly consist of weak magnetic titanium concentrate, white titanium stone, rutile, zircon sand, quartz, coal-based reducing agent and the like.
Because unreacted coal-based reducing agent in the reduced titanium magnetic separation tailings can be used as active carbon, the reduced titanium magnetic separation tailings are directly used as low-quality active carbon or carbon powder in the prior art, and the recovery of titanium concentrate and zircon sand in the reduced titanium magnetic separation tailings is omitted, so that the resource waste is caused.
In view of this, the present invention has been made.
Disclosure of Invention
The first aim of the invention is to provide a method for recovering titanium concentrate and zircon sand in reduced titanium magnetic separation tailings, which can effectively recover and enrich the titanium concentrate and the zircon sand in the reduced titanium magnetic separation tailings while obtaining active carbon, and can recycle waste byproducts, thereby avoiding waste of resources and improving added value.
The second object of the invention is to provide an application of the method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic separation tailings in the production of titanium-rich materials.
In order to achieve the above object of the present invention, the following technical solutions are specifically adopted:
the invention provides a method for recovering titanium concentrate and zircon sand in reduced titanium magnetic tailings, which comprises the following steps:
(a) Screening the reduced titanium magnetic tailings to obtain oversize materials and undersize materials, carrying out gravity concentration and roughing separation on the undersize materials to obtain gravity concentration roughing concentrate and gravity concentration roughing tailings, and mixing the gravity concentration roughing tailings with the oversize materials to obtain activated carbon;
wherein the reduced titanium magnetic tailings comprise magnetic tailings obtained by reducing and magnetically separating ilmenite;
(b) Carrying out magnetic separation roughing on the gravity concentration roughing concentrate to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings; the magnetic separation roughing tailings are subjected to first scavenging to obtain primary scavenging concentrate and primary scavenging tailings;
(c) Performing first electric concentration on the first-stage scavenging concentrate obtained in the step (b) to obtain first-stage electric concentration concentrate and first-stage electric concentration tailings;
(d) Performing second scavenging on the first-stage scavenging tailings obtained in the step (b) to obtain second-stage scavenging concentrate and second-stage scavenging tailings, wherein the second-stage scavenging concentrate is subjected to second electric concentration to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings;
(e) Performing electric scavenging on the two-stage scavenging tailings obtained in the step (d) to obtain electric scavenging concentrate and electric scavenging tailings;
(f) Mixing the magnetic separation roughing concentrate obtained in the step (b), the one-stage electric separation concentrating concentrate obtained in the step (c), the two-stage electric separation concentrating concentrate obtained in the step (d) and the electric separation scavenging concentrate obtained in the step (e) to obtain titanium concentrate;
mixing the primary electric concentration tailings obtained in the step (c), the secondary electric concentration tailings obtained in the step (d) and the electric scavenger tailings obtained in the step (e) to obtain zircon sand coarse ore; and (3) carrying out gravity concentration on the zircon sand coarse ore to obtain the zircon sand.
The invention also provides application of the method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic separation tailings in producing titanium-rich materials.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the method for recycling the titanium concentrate and the zircon sand in the reduced titanium magnetic separation tailings, the active carbon is obtained through separation, and meanwhile, the titanium concentrate and the zircon sand in the reduced titanium magnetic separation tailings can be effectively recycled and enriched.
(2) According to the method for recovering and reducing the titanium concentrate and the zircon sand in the titanium magnetic separation tailings, the grade of the separated titanium concentrate is more than or equal to 55wt.% and the grade of the zircon sand is more than or equal to 50wt.%.
(3) According to the method for recycling and reducing the titanium concentrate and the zircon sand in the titanium magnetic separation tailings, impurities in the activated carbon are further removed, and the decolorizing capacity of the activated carbon is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a process flow diagram of a method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings provided by the invention.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative of the present invention only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In a first aspect, the present invention provides a method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic separation tailings, referring to fig. 1, which is a process flow chart of the method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic separation tailings, specifically comprising the following steps:
(a) And screening the reduced titanium magnetic separation tailings to obtain oversize products and undersize products. Wherein, the oversize material refers to the material left on the screen surface or the screen, and the undersize material refers to the material passing through the screen surface or the screen. The reduced titanium magnetic separation tailings comprise magnetic separation tailings obtained after ilmenite is reduced and magnetically separated.
And (3) obtaining gravity concentration roughing concentrate and gravity concentration roughing tailings after gravity concentration roughing separation of the undersize material, and obtaining the activated carbon after mixing the gravity concentration roughing tailings with the oversize material.
In a preferred embodiment, in the reduced titanium magnetic separation tailings, the grade of the titanium concentrate is less than or equal to 20wt.% and the grade of the zircon sand is less than or equal to 5wt.%.
(b) And (c) carrying out magnetic separation roughing of low magnetic field strength on the gravity roughing concentrate obtained in the step (a) to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings. And the magnetic separation roughing tailings are subjected to first scavenging with medium magnetic field intensity to obtain a section of scavenging concentrate and a section of scavenging tailings.
(c) And (c) heating the primary scavenging concentrate obtained in the step (b) and then carrying out primary electric concentration to obtain primary electric concentration concentrate and primary electric concentration tailings.
(d) And (c) performing second scavenging on the first-stage scavenging tailings obtained in the step (b) to obtain second-stage scavenging concentrate and second-stage scavenging tailings, wherein the second-stage scavenging concentrate is subjected to second electric concentration to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings.
(e) And (d) performing electric scavenging on the two-stage scavenging tailings obtained in the step (d) to obtain electric scavenging concentrate and electric scavenging tailings.
(f) Mixing the magnetic separation rough concentration concentrate obtained in the step (b), the one-stage electric concentration concentrate obtained in the step (c), the two-stage electric concentration concentrate obtained in the step (d) and the electric scavenging concentrate obtained in the step (e) to obtain titanium concentrate.
And mixing the primary electric concentration tailings obtained in the step (c), the secondary electric concentration tailings obtained in the step (d) and the electric scavenging tailings obtained in the step (e) to obtain zircon sand coarse ore.
And (3) carrying out gravity concentration on the zircon sand coarse ore to obtain the zircon sand.
It will be appreciated that in fig. 1, to distinguish the consolidated term of the titanium concentrate (the lines are marked as solid lines), the consolidated term of zircon sand is marked as a dashed line.
The principle of the method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic tailings is as follows:
the reduced titanium magnetic separation tailings comprise active carbon particles with larger particle sizes and active carbon particles with smaller particle sizes, and the active carbon particles with larger particle sizes can be separated through a simple screening method; compared with titanium, zirconium and gangue components, the smaller activated carbon particles have lighter specific gravity, can enter tailings through reselection to achieve the purpose of effective separation, and the coarse and fine activated carbon particles are combined to obtain the high-quality activated carbon. Separating the low-magnetic-field-strength unseparated titanium concentrate in the reduced titanium magnetic-separation tailings through magnetic separation roughing; in the subsequent first scavenging process, the magnetic field intensity is improved, the separation of the weak magnetic white titanium stones in the reduced titanium magnetic tailings is completed, but because of the enhancement of the magnetic field intensity, the probability of zircon sand and gangue entering the white titanium stones is increased, the concentrate subjected to the first scavenging needs to be separated through the first electric concentration, according to the principle that the zircon sand and the gangue are non-conductive, the first electric concentration concentrate obtained after the first electric concentration of the first-stage scavenging concentrate is the high-quality titanium concentrate after impurity removal, and the main components of the first-stage electric concentration tailings comprise the zircon sand and the gangue. The main components of the first section of scavenging tailings comprise rutile, zircon sand and gangue, the rutile can be separated out through electric separation by the difference of conductivity, and finally, the titanium concentrate, the white titanium stone and the rutile are combined to obtain the high-grade titanium concentrate. And combining the electric separation tailings, and then effectively removing gangue through reselection according to the difference of specific gravity of zircon sand and gangue components to obtain high-grade zircon sand.
According to the method for recycling the titanium concentrate and the zircon sand in the reduced titanium magnetic separation tailings, the reduced titanium magnetic separation tailings are subjected to screening and gravity concentration roughing separation to obtain carbon particles with coarser specific gravity and lighter specific gravity, the titanium concentrate and the zircon sand are separated in a step-by-step magnetic separation-electric separation mode, impurities in the zircon sand are removed through gravity separation, and finally the titanium concentrate and the zircon sand can be recycled.
In addition, the invention gradually recovers the titanium concentrate according to different grades of the magnetism of the titanium concentrate, the white titanium stone and the rutile, separates the rutile from the zircon sand according to different conductivity of the rutile, the zircon sand and the gangue, removes impurities from the zircon sand according to different specific gravities of the zircon sand and the zircon sand, and improves the overall recovery rate of the titanium concentrate and the zircon sand.
Further, according to the method, impurities in the activated carbon are further removed while the titanium concentrate and zircon sand in the reduced titanium magnetic separation tailings are recovered, and the decolorizing capacity of the obtained activated carbon is further improved.
In addition, the method has the advantages of simple process, conventional equipment used, easiness in realizing mass production and the like.
In a preferred embodiment, the grade of the titanium concentrate obtained in step (f) is not less than 55wt.%; including but not limited to a point value of any one of 58wt.%, 60wt.%, 63wt.%, 65wt.%, 67wt.%, 70wt.%, or a range value therebetween; more preferably ≡58wt.%.
In a preferred embodiment, the grade of the zircon sand obtained in step (f) is ≡50wt.%, including, but not limited to, a point value of any one of 50wt.%, 53wt.%, 55wt.%, 58wt.%, 60wt.%, 63wt.%, 65wt.%, 68wt.%, 70wt.% or a range value between any two; more preferably not less than 55wt.%.
The grade refers to the content ratio (mass fraction) of oxides of useful elements in the ore. Specifically, the grade of the titanium concentrate refers to the mass percent of titanium dioxide in the titanium concentrate. The grade of zircon sand refers to the mass percent of zirconium dioxide in the zircon sand.
In order to further improve the overall recovery rate of the titanium concentrate and the zircon sand, the invention optimizes the technological parameters of the processes of screening, gravity concentration and roughing separation, magnetic separation and roughing, first scavenging, first electric concentration, second scavenging, second electric concentration, electric scavenging, gravity concentration and the like as follows.
In a preferred embodiment, in step (a), the mesh size of the screen used in the screening is 20-60 mesh, including but not limited to a point size of any one of 30 mesh, 40 mesh, 50 mesh or a range of values between any two.
In a preferred embodiment, in the step (a), the undersize is mixed with water to form pulp, and then the gravity separation and roughing separation are performed, wherein the mass fraction of the pulp is 25% -40%; including but not limited to a point value of any one of 27%, 30%, 32%, 35%, 38%, or a range value between any two.
In a preferred embodiment, in the step (a), the stroke of the gravity concentration and roughing separation is 10-20 mm, including but not limited to any one of 12mm, 14mm, 15mm and 18mm, or a range value between any two; the washing frequency of the gravity concentration roughing separation is 150-250 times/min, including but not limited to any one point value or any range value between 170 times/min, 190 times/min, 200 times/min, 220 times/min and 240 times/min.
In a preferred embodiment, the gravity rougher separation may be performed in any conventional gravity separation equipment, including, but not limited to, shaker and spiral chute, for example.
In a preferred embodiment, before the gravity rougher tailings are mixed with the oversize material, the gravity rougher tailings are subjected to pressure filtration and drying, and then are mixed with the oversize material to obtain the activated carbon.
In a preferred embodiment, the gravity rougher concentrate is press filtered and dried before the magnetic separation rougher.
In a preferred embodiment, in the step (b), the magnetic field strength of the magnetic separation rougher is 3000-5000 GS; including but not limited to a point value of any one of 3300GS, 3500GS, 3800GS, 4000GS, 4200GS, 4500GS, 4800GS, or a range value therebetween.
In a preferred embodiment, in the step (b), the magnetic field strength of the first scan is 5000-7000 GS, including but not limited to any one of 5300GS, 5500GS, 5800GS, 6000GS, 6200GS, 6500GS, 6800GS, or a range between any two of them.
In a preferred embodiment, in the step (c), the selected electric selection voltage of the first electric selection is 18000 to 22000V, including but not limited to any one of 19000V, 20000V, 21000V, or a range of values between any two.
In a preferred embodiment, in the step (d), the magnetic field strength of the second sweep is 7000 to 9000GS; including but not limited to a point value of any one of 7300GS, 7500GS, 7800GS, 8000GS, 8300GS, 8500GS, 8800GS, or a range value between any two.
In a preferred embodiment, in the step (d), the second electroconcentration has a selected electroconcentration voltage of 18000 to 22000V, including but not limited to any one of 19000V, 20000V, 21000V, or a range of values between any two.
In a preferred embodiment, in the step (e), the electric selecting voltage of the electric selecting and sweeping is 18000V to 22000V, including but not limited to any one of 19000V, 20000V and 21000V or a range of values between any two.
In a preferred embodiment, in the step (f), the zircon sand coarse ore is mixed with water to form ore pulp, and then the ore pulp is subjected to the reselection and concentration, wherein the mass fraction of the ore pulp is 25% -40%; including but not limited to a point value of any one of 27%, 30%, 32%, 35%, 38%, or a range value between any two.
In a preferred embodiment, in step (f), the reselection selection is performed with a stroke of 20-30 mm, including but not limited to a point value of any one of 22mm, 24mm, 25mm, 28mm or a range value between any two; the flushing frequency of the gravity concentration roughing separation is 250-350 times/min, including but not limited to any one point value or any range value between any two of 270 times/min, 290 times/min, 300 times/min, 320 times/min and 340 times/min.
In a preferred embodiment, in step (f), the reselection beneficiation can be performed in any conventional reselection equipment, including, but not limited to, shaking tables and spiral trays, for example.
In a preferred embodiment, the activated carbon obtained by the method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic tailings has a decolorizing power (methylene blue adsorption value) of more than or equal to 200mg/g, including but not limited to a point value of any one of 210mg/g, 220mg/g, 230mg/g, 240mg/g, 250mg/g or a range value between any two.
In a second aspect, the invention also provides application of the method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic separation tailings in producing titanium-rich materials.
In the process of producing the titanium-rich material, after the reduced titanium magnetic separation tailings are obtained, the method is adopted to recycle the titanium concentrate and zircon sand in the reduced titanium magnetic separation tailings, the separated titanium concentrate can be used for producing high titanium slag, titanium white, acid sludge, titanium tetrachloride, titanium sponge and the like, and the separated zircon sand can be used for producing refractory materials, sand for industry casting molds, ceramics and enamelware, glass, zirconium compounds, iron alloys, medicines, paints, abrasives, tanning and the like.
Meanwhile, the activated carbon separated by the method can be used for air purification, sewage treatment, decolorization, soil conditioning performance, vegetable fresh-keeping and the like, and has better adsorption capacity.
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The reduced titanium magnetic separation tailings adopted in each example and each comparative example are magnetic separation tailings (same batch) obtained after ilmenite is reduced and magnetically separated, wherein in the reduced titanium magnetic separation tailings, the grade of titanium concentrate is 18.35wt.%, the grade of zircon sand is 2.22wt.%, the mass fraction of active carbon in the reduced titanium magnetic separation tailings is 47.03wt.%, and the decolorizing force (namely methylene blue adsorption value) of the reduced titanium magnetic separation tailings is 120mg/g.
In the invention, the decolorizing force is measured as methylene blue adsorption value, and the measuring method is as follows: preparing methylene blue solution with mass concentration of 1.5g/L for later use, grinding the sample to be tested to more than 90%, enabling the sample to pass through a 0.045mm test sieve, mixing the sieved sample with the sample, drying the mixture in an electrothermal constant-temperature drying oven at 150 ℃ for 2 hours, and cooling the mixture in a dryer for later use. Weighing 0.1 g+/-0.0004 g of a sample to be measured, placing the sample into a 100mL conical flask, adding 5mL-15mL of methylene blue solution into the conical flask by using a dropper, plugging a bottle stopper, and placing the bottle stopper on an oscillator to oscillate for 30min; filtering the methylene blue solution adsorbed by the sample to be detected into a colorimetric tube, and uniformly mixing; measuring the absorbance value of the filtrate by using a 10mL cuvette at a wavelength of 665nm and using water as a reference solution, wherein the absorbance value of the filtrate is within +/-0.020 from the absorbance reading difference of the standard solution of copper sulfate; if the content of the methylene blue solution exceeds the above range, the milliliters of the methylene blue solution should be adjusted and added, and the above operation is repeated until the content meets the requirement. The methylene blue adsorption value E is expressed in units of (mg/g) at this time, and is calculated as follows: e=cv/m, where c is the methylene blue solution concentration number in milligrams per milliliter (mg/mL); v is the value of the volume of the methylene blue solution consumed by the measurement sample, and the unit is mL; m is the value of the sample mass in grams (g).
Example 1
The method for recovering and reducing the titanium concentrate and the zircon sand in the titanium magnetic separation tailings provided by the embodiment comprises the following steps:
(1) And sieving the reduced titanium magnetic separation tailings through a 40-mesh sieve to obtain oversize products and undersize products. And (3) mixing and pulping undersize materials and water to obtain ore pulp with the mass fraction of 30%, carrying out gravity concentration and roughing separation on the ore pulp through a shaking table, wherein the stroke of the gravity concentration and roughing separation is 12mm, and the stroke frequency is 200 times/min, so as to obtain gravity concentration and gravity concentration tailings. And mixing the gravity concentration roughing tailings with the oversize materials after filter pressing and drying to obtain the activated carbon.
(2) And (3) carrying out magnetic separation roughing on the gravity concentration roughing concentrate obtained in the step (1) under the magnetic field intensity of 4000GS to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings, and carrying out first scavenging on the magnetic separation roughing tailings under the magnetic field intensity of 6000GS to obtain first-stage scavenging concentrate and first-stage scavenging tailings.
(3) And (3) heating the first-stage scavenging concentrate obtained in the step (2) to 150 ℃ and carrying out first electric concentration, wherein the electric concentration voltage is 20000V, so as to obtain first-stage electric concentration concentrate and first-stage electric concentration tailings.
(4) Performing second scavenging on the first section of scavenging tailings obtained in the step (2) under the magnetic field strength of 8000GS to obtain second section of scavenging concentrate and second section of scavenging tailings; then, carrying out second electric concentration on the second-stage scavenging concentrate, wherein the electric concentration voltage is 20000V, so as to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings; mixing the two-stage electric concentration concentrate, the magnetic separation roughing concentrate obtained in the step (2) and the one-stage electric concentration concentrate obtained in the step (3) to obtain the titanium concentrate.
(5) And (3) performing electric scavenging on the two-stage scavenging tailings obtained in the step (4), wherein the electric scavenging voltage is 20000V, and electric scavenging concentrate and electric scavenging tailings are obtained.
(6) The magnetic separation rough concentration concentrate obtained in the step (2), the primary electric concentration concentrate obtained in the step (3), the secondary electric concentration concentrate obtained in the step (4) and the electric scavenging concentrate obtained in the step (5) are mixed to obtain the titanium concentrate.
And (3) mixing the electric scavenging tailings obtained in the step (5), the first-stage electric scavenging tailings obtained in the step (3) and the second-stage electric scavenging tailings obtained in the step (4) to obtain zircon sand coarse ore. And (3) mixing and pulping the zircon sand coarse ore with water to obtain ore pulp with the mass fraction of 30%, then using a shaking table to perform gravity concentration on the ore pulp, obtaining gravity concentration concentrate with the gravity concentration stroke of 20mm and the stroke frequency of 350 times/min, and performing filter pressing and drying to obtain the zircon sand.
Example 2
The method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic separation tailings provided by the embodiment comprises the following steps:
(1) And sieving the reduced titanium magnetic separation tailings through a 40-mesh sieve to obtain oversize products and undersize products. And (3) mixing and pulping undersize materials and water to obtain pulp with the mass fraction of 25%, carrying out gravity concentration and roughing separation on the pulp through a shaking table, wherein the stroke of the gravity concentration and roughing separation is 10mm, and the stroke frequency is 150 times/min, so as to obtain gravity concentration and gravity concentration tailings. And mixing the gravity concentration roughing tailings with the oversize materials after filter pressing and drying to obtain the activated carbon.
(2) And (3) carrying out magnetic separation roughing on the gravity concentration roughing concentrate obtained in the step (1) under the magnetic field intensity of 3000GS to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings, and carrying out first scavenging on the magnetic separation roughing tailings under the magnetic field intensity of 5000GS to obtain a section of scavenging concentrate and a section of scavenging tailings.
(3) And (3) heating the first-stage scavenging concentrate obtained in the step (2) to 150 ℃ and carrying out first electric concentration, wherein the electric concentration voltage is 20000V, so as to obtain first-stage electric concentration concentrate and first-stage electric concentration tailings.
(4) Performing second scavenging on the first section of scavenging tailings obtained in the step (2) under the magnetic field intensity of 7500GS to obtain second section of scavenging concentrate and second section of scavenging tailings; then, carrying out second electric concentration on the second-stage scavenging concentrate, wherein the electric concentration voltage is 19000V, so as to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings; mixing the two-stage electric concentration concentrate, the magnetic separation roughing concentrate obtained in the step (2) and the one-stage electric concentration concentrate obtained in the step (3) to obtain the titanium concentrate.
(5) And (3) performing electric scavenging on the two-stage scavenging tailings obtained in the step (4), wherein the electric scavenging voltage is 20000V, and electric scavenging concentrate and electric scavenging tailings are obtained.
(6) The magnetic separation rough concentration concentrate obtained in the step (2), the primary electric concentration concentrate obtained in the step (3), the secondary electric concentration concentrate obtained in the step (4) and the electric scavenging concentrate obtained in the step (5) are mixed to obtain the titanium concentrate.
And (3) mixing the electric scavenging tailings obtained in the step (5), the first-stage electric scavenging tailings obtained in the step (3) and the second-stage electric scavenging tailings obtained in the step (4) to obtain zircon sand coarse ore. And (3) mixing and pulping the zircon sand coarse ore with water to obtain ore pulp with the mass fraction of 25%, then using a shaking table to perform gravity concentration on the ore pulp, wherein the gravity concentration stroke is 25mm, the stroke frequency is 250 times/min, obtaining gravity concentration concentrate, and then performing filter pressing and drying to obtain the zircon sand.
Example 3
The method for recovering the titanium concentrate and the zircon sand in the reduced titanium magnetic separation tailings provided by the embodiment comprises the following steps:
(1) And sieving the reduced titanium magnetic separation tailings through a 40-mesh sieve to obtain oversize products and undersize products. And (3) mixing and pulping undersize materials and water to obtain ore pulp with the mass fraction of 35%, carrying out gravity concentration and roughing separation on the ore pulp through a shaking table, wherein the stroke of the gravity concentration and roughing separation is 15mm, and the stroke frequency is 220 times/min, so as to obtain gravity concentration and gravity concentration tailings. And mixing the gravity concentration roughing tailings with the oversize materials after filter pressing and drying to obtain the activated carbon.
(2) And (3) carrying out magnetic separation roughing on the gravity roughing concentrate obtained in the step (1) under the magnetic field strength of 5000GS to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings, and carrying out first scavenging on the magnetic separation roughing tailings under the magnetic field strength of 7000GS to obtain a section of scavenging concentrate and a section of scavenging tailings.
(3) And (3) heating the first-stage scavenging concentrate obtained in the step (2) to 150 ℃ and carrying out first electric concentration, wherein the electric concentration voltage is 21000V, so as to obtain first-stage electric concentration concentrate and first-stage electric concentration tailings.
(4) Performing second scavenging on the first section of scavenging tailings obtained in the step (2) under the magnetic field strength of 8000GS to obtain second section of scavenging concentrate and second section of scavenging tailings; then, carrying out second electric concentration on the second-stage scavenging concentrate, wherein the electric concentration voltage is 21000V, so as to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings; mixing the two-stage electric concentration concentrate, the magnetic separation roughing concentrate obtained in the step (2) and the one-stage electric concentration concentrate obtained in the step (3) to obtain the titanium concentrate.
(5) And (3) performing electric scavenging on the two-stage scavenging tailings obtained in the step (4), wherein the electric scavenging voltage is 19000V, and electric scavenging concentrate and electric scavenging tailings are obtained.
(6) The magnetic separation rough concentration concentrate obtained in the step (2), the primary electric concentration concentrate obtained in the step (3), the secondary electric concentration concentrate obtained in the step (4) and the electric scavenging concentrate obtained in the step (5) are mixed to obtain the titanium concentrate.
And (3) mixing the electric scavenging tailings obtained in the step (5), the first-stage electric scavenging tailings obtained in the step (3) and the second-stage electric scavenging tailings obtained in the step (4) to obtain zircon sand coarse ore. And (3) mixing and pulping the zircon sand coarse ore with water to obtain ore pulp with the mass fraction of 35%, then using a shaking table to perform gravity concentration on the ore pulp, wherein the stroke of gravity concentration is 30mm, the stroke frequency is 350 times/min, obtaining gravity concentration concentrate, and then performing filter pressing and drying to obtain the zircon sand.
Example 4
The method for recovering the titanium concentrate and the zircon sand in the reduced titanium magnetic separation tailings provided by the embodiment comprises the following steps:
(1) And (5) sieving the reduced titanium magnetic separation tailings through a 50-mesh sieve to obtain oversize products and undersize products. And (3) mixing and pulping undersize materials and water to obtain ore pulp with the mass fraction of 40%, carrying out gravity concentration and roughing separation on the ore pulp through a shaking table, wherein the stroke of the gravity concentration and roughing separation is 20mm, and the stroke frequency is 250 times/min, so as to obtain gravity concentration and gravity concentration tailings. And mixing the gravity concentration roughing tailings with the oversize materials after filter pressing and drying to obtain the activated carbon.
(2) And (3) carrying out magnetic separation roughing on the gravity concentration roughing concentrate obtained in the step (1) under the magnetic field intensity of 4500GS to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings, and carrying out first scavenging on the magnetic separation roughing tailings under the magnetic field intensity of 6500GS to obtain first-stage scavenging concentrate and first-stage scavenging tailings.
(3) And (3) heating the first-stage scavenging concentrate obtained in the step (2) to 150 ℃ and carrying out first electric concentration, wherein the electric concentration voltage is 22000V, so as to obtain first-stage electric concentration concentrate and first-stage electric concentration tailings.
(4) Performing second scavenging on the first section of scavenging tailings obtained in the step (2) under the magnetic field intensity of 9000GS to obtain second section of scavenging concentrate and second section of scavenging tailings; then, carrying out second electric concentration on the second-stage scavenging concentrate, wherein the electric concentration voltage is 22000V, so as to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings; mixing the two-stage electric concentration concentrate, the magnetic separation roughing concentrate obtained in the step (2) and the one-stage electric concentration concentrate obtained in the step (3) to obtain the titanium concentrate.
(5) And (3) performing electric scavenging on the two-stage scavenging tailings obtained in the step (4), wherein the electric scavenging voltage is 22000V, and electric scavenging concentrate and electric scavenging tailings are obtained.
(6) The magnetic separation rough concentration concentrate obtained in the step (2), the primary electric concentration concentrate obtained in the step (3), the secondary electric concentration concentrate obtained in the step (4) and the electric scavenging concentrate obtained in the step (5) are mixed to obtain the titanium concentrate.
And (3) mixing the electric scavenging tailings obtained in the step (5), the first-stage electric scavenging tailings obtained in the step (3) and the second-stage electric scavenging tailings obtained in the step (4) to obtain zircon sand coarse ore. And (3) mixing and pulping the zircon sand coarse ore with water to obtain ore pulp with the mass fraction of 40%, then using a shaking table to perform gravity concentration on the ore pulp, obtaining gravity concentration concentrate with the gravity concentration stroke of 25mm and the stroke frequency of 300 times/min, and performing filter pressing and drying to obtain the zircon sand.
Example 5
The method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic tailings provided in this example is basically the same as that in example 1, except that in step (2), the magnetic field strength of the magnetic separation roughing is replaced with 3500GS, and the magnetic field strength of the first scavenging is replaced with 5500GS.
Example 6
The method for recovering the titanium concentrate and the zircon sand in the reduced titanium magnetic tailings provided in this example is basically the same as that in example 1, except that the electric separation voltage for the first electric separation and concentration in step (3) is replaced with 18000V, and the electric separation voltage for the electric separation and scavenging in step (5) is replaced with 18000V.
Example 7
The method for recovering the titanium concentrate and the zircon sand in the reduced titanium magnetic tailings provided in the present embodiment is basically the same as that in embodiment 1, except that in step (4), the magnetic field strength of the second scavenging is replaced with 7000GS; and replacing the electrowinning voltage of the second electrowinning selection with 18000V.
Comparative example 1
The method for recovering the titanium concentrate and zircon sand in the reduced titanium magnetic tailings provided in this comparative example is substantially the same as in example 1, except that in step (2), the magnetic field strength of the magnetic separation rougher is replaced with 2000GS.
Comparative example 2
The method for recovering the titanium concentrate and zircon sand in the reduced titanium magnetic tailings provided in this comparative example is substantially the same as in example 1, except that in step (3), the electrowinning voltage of the first electrowinning is replaced with 15000V.
Comparative example 3
The method for recovering the titanium concentrate and zircon sand in the reduced titanium magnetic tailings provided in this comparative example is substantially the same as in example 1, except that in step (4), the magnetic field strength of the second scavenger is replaced with 5000GS.
Experimental example
The grade of the titanium concentrate (mass% of titanium dioxide in the titanium concentrate) and the grade of zircon sand (mass% of zirconium dioxide in the zircon sand) obtained by separating the above examples and comparative examples were measured, respectively, and the results are shown in table 1 below.
The activated carbon obtained by separation of each example and each comparative example was tested for decolorizing power and methylene blue adsorption value thereof is shown in table 1 below.
TABLE 1 titanium concentrate grade, zircon sand grade and activated carbon decolorizing force results
As can be seen from table 1, the grade of the titanium concentrate obtained by separation in each embodiment of the present invention is not less than 55wt.%, and the grade of the zircon sand is not less than 50wt.%, whereas the grade of the titanium concentrate and the zircon sand in each comparative example are lower than those in embodiment 1, and it can be seen that the overall recovery rate of the titanium concentrate and the zircon sand can be further improved by optimizing the process parameters of magnetic separation roughing, first electric separation and second scavenging.
In addition, by comparing the decolorizing force of the reduced titanium magnetic separation tailings before separation with the decolorizing force of the activated carbon obtained after separation, the method for recycling the titanium concentrate and the zircon sand in the reduced titanium magnetic separation tailings can further remove impurities in the activated carbon, and further improve the adsorption capacity of the activated carbon.
While the invention has been illustrated and described with reference to specific embodiments, it is to be understood that the above embodiments are merely illustrative of the technical aspects of the invention and not restrictive thereof; those of ordinary skill in the art will appreciate that: modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some or all of the technical features thereof, without departing from the spirit and scope of the present invention; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; it is therefore intended to cover in the appended claims all such alternatives and modifications as fall within the scope of the invention.
Claims (10)
1. The method for recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic separation tailings is characterized by comprising the following steps:
(a) Screening the reduced titanium magnetic tailings to obtain oversize materials and undersize materials, carrying out gravity concentration and roughing separation on the undersize materials to obtain gravity concentration roughing concentrate and gravity concentration roughing tailings, and mixing the gravity concentration roughing tailings with the oversize materials to obtain activated carbon;
wherein the reduced titanium magnetic tailings comprise magnetic tailings obtained by reducing and magnetically separating ilmenite;
(b) Carrying out magnetic separation roughing on the gravity concentration roughing concentrate to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings; the magnetic separation roughing tailings are subjected to first scavenging to obtain primary scavenging concentrate and primary scavenging tailings;
(c) Performing first electric concentration on the first-stage scavenging concentrate obtained in the step (b) to obtain first-stage electric concentration concentrate and first-stage electric concentration tailings;
(d) Performing second scavenging on the first-stage scavenging tailings obtained in the step (b) to obtain second-stage scavenging concentrate and second-stage scavenging tailings, wherein the second-stage scavenging concentrate is subjected to second electric concentration to obtain second-stage electric concentration concentrate and second-stage electric concentration tailings;
(e) Performing electric scavenging on the two-stage scavenging tailings obtained in the step (d) to obtain electric scavenging concentrate and electric scavenging tailings;
(f) Mixing the magnetic separation roughing concentrate obtained in the step (b), the one-stage electric separation concentrating concentrate obtained in the step (c), the two-stage electric separation concentrating concentrate obtained in the step (d) and the electric separation scavenging concentrate obtained in the step (e) to obtain titanium concentrate;
mixing the primary electric concentration tailings obtained in the step (c), the secondary electric concentration tailings obtained in the step (d) and the electric scavenger tailings obtained in the step (e) to obtain zircon sand coarse ore; and (3) carrying out gravity concentration on the zircon sand coarse ore to obtain the zircon sand.
2. The method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein in the step (a), the mesh size of the screen used for the screening is 20 to 60 mesh.
3. The method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein in the step (a), the undersize is mixed with water to form ore pulp, and then the re-separation and the roughing separation are carried out, wherein the mass fraction of the ore pulp is 25% -40%;
and/or in the step (a), the stroke of the gravity concentration and roughing separation is 10-20 mm, and the stroke frequency of the gravity concentration and roughing separation is 150-250 times/min.
4. The method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein in step (b), the magnetic field strength of the magnetic separation rougher is 3000-5000 GS;
and/or, in the step (b), the magnetic field intensity of the first scavenging is 5000-7000 GS.
5. The method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein in step (c), the first electroconcentration has an electroconcentration voltage of 18000V to 22000V.
6. The method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein in step (d), the second scavenger has a magnetic field strength of 7000 to 9000GS;
and/or, in the step (d), the electric selection voltage of the second electric selection is 18000-22000V.
7. The method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein in step (e), the electric separation voltage of the electric separation scavenger is 18000 to 22000V.
8. The method of recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein in step (f), the re-concentration is performed after the zircon sand coarse ore is mixed with water to form a pulp, and the mass fraction of the pulp is 25% -40%;
and/or in the step (f), the stroke of the gravity concentration and the rough concentration is 20-30 mm, and the stroke frequency of the gravity concentration and the rough concentration is 250-350 times/min.
9. The method for recovering and reducing titanium concentrate and zircon sand in titanium magnetic tailings according to claim 1, wherein the grade of the titanium concentrate obtained in step (f) is not less than 55wt.%;
and/or, the grade of the zircon sand obtained in the step (f) is more than or equal to 50 wt%.
10. Use of the method of recovering and reducing the titanium concentrate and zircon sand in the titanium magnetic tailings according to any one of claims 1 to 9 in the production of a titanium rich material.
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