CN117065917B - Novel process for reducing titanium of fine-particle iron concentrate extract - Google Patents
Novel process for reducing titanium of fine-particle iron concentrate extract Download PDFInfo
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- CN117065917B CN117065917B CN202311054528.2A CN202311054528A CN117065917B CN 117065917 B CN117065917 B CN 117065917B CN 202311054528 A CN202311054528 A CN 202311054528A CN 117065917 B CN117065917 B CN 117065917B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 239000012141 concentrate Substances 0.000 title claims abstract description 94
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 74
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000010936 titanium Substances 0.000 title claims abstract description 47
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 title claims abstract description 35
- 239000000284 extract Substances 0.000 title claims abstract description 12
- 239000010419 fine particle Substances 0.000 title claims description 5
- 238000005188 flotation Methods 0.000 claims abstract description 74
- 230000002441 reversible effect Effects 0.000 claims abstract description 54
- 229920000881 Modified starch Polymers 0.000 claims abstract description 26
- 239000004368 Modified starch Substances 0.000 claims abstract description 26
- 235000019426 modified starch Nutrition 0.000 claims abstract description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 239000003112 inhibitor Substances 0.000 claims abstract description 24
- 238000007885 magnetic separation Methods 0.000 claims abstract description 20
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 16
- JLXAQYGJCVUJLE-UHFFFAOYSA-N n-hydroxynonanamide Chemical compound CCCCCCCCC(=O)NO JLXAQYGJCVUJLE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920002472 Starch Polymers 0.000 claims abstract description 11
- 235000019698 starch Nutrition 0.000 claims abstract description 11
- 239000008107 starch Substances 0.000 claims abstract description 11
- 240000003183 Manihot esculenta Species 0.000 claims abstract description 8
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims abstract description 8
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 claims abstract description 8
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims abstract description 5
- 230000004048 modification Effects 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 8
- 230000002829 reductive effect Effects 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 239000003814 drug Substances 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 229910001200 Ferrotitanium Inorganic materials 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000004064 recycling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 150000004665 fatty acids Chemical class 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- NEAQRZUHTPSBBM-UHFFFAOYSA-N 2-hydroxy-3,3-dimethyl-7-nitro-4h-isoquinolin-1-one Chemical class C1=C([N+]([O-])=O)C=C2C(=O)N(O)C(C)(C)CC2=C1 NEAQRZUHTPSBBM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002542 deteriorative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 229910001608 iron mineral Inorganic materials 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- VJWWIRSVNSXUAC-UHFFFAOYSA-N arsinic acid Chemical class O[AsH2]=O VJWWIRSVNSXUAC-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000003636 chemical group Chemical group 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a novel process for reducing titanium in a fine-grained iron concentrate extract, and belongs to the field of mineral separation and resource comprehensive utilization. The process comprises the following steps: (1) superfine grinding: superfine grinding is carried out on the fine-grained iron ore concentrate, and the fineness of the ground ore product is controlled to be more than 95 percent when the occupation ratio of-20 mu m is controlled. (2) full open circuit short flow reverse flotation after weak magnetic separation: conventional weak magnetic separation is carried out on the ore pulp after superfine grinding, and then full open-circuit short-flow reverse flotation is carried out on weak magnetic concentrate, so that the requirements can be met through two-section open-circuit in general; the collecting agent is autonomously compounded and assembled, and the mass component ratio of the novel combined collecting agent NaOL-OHA is as follows: 70-90% sodium oleate (NaOL), 10-30% Octyl Hydroxamic Acid (OHA); the mass component ratio of the inhibitor modified starch is as follows: 50-70% of tapioca starch, 25-35% of hydrogen peroxide and 2-5% of sodium hydroxide. The new process can effectively reduce the titanium content in the iron concentrate on the premise of ensuring the iron recovery rate, so that the iron concentrate can be used as the raw material for blast furnace smelting of the ferrotitanium-containing refined powder, and has the advantages of simple flow, low medicament cost and convenient operation and implementation.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of mineral separation resources, and particularly relates to a novel process for reducing titanium in a fine-grained iron concentrate extract.
Background
The low quality iron ore resource is beneficiated to obtain high grade iron concentrate, but the iron ore resource still has two problems. Firstly, because the particle size is fine, the method cannot be directly used for blast furnace smelting, and the uniform particle size of furnace burden, less powder and high mechanical strength can be ensured by an iron ore sintering or pellet agglomeration method, so that the requirements of blast furnace ironmaking smelting are met, wherein the energy consumption and carbon emission of a pellet process are only 1/2 of that of sintering, and the main reason is that the raw materials suitable for pellet development are too few. Secondly, it contains a lot of impurities (especially titanium) and can have adverse effects on the blast furnace during smelting.
Aiming at the difficult problem of improving the quality of the iron concentrate, the key point is how to effectively remove impurities, especially titanium, and the aim is difficult to realize by the conventional single magnetic separation. In recent years, flotation has become an efficient method for enriching fine-grained ilmenite relative to gravity, magnetic separation and electroseparation methods due to the smaller grain size and reduced density, magnetic and electrical differences, but is rarely used in research on the titanium reduction of iron concentrate extracts. Therefore, on the basis of the conventional beneficiation process, a new process for reducing titanium in the iron concentrate extract is researched and developed, so that the process not only meets the requirements of technical economy and rationality, but also can effectively realize the purpose of comprehensive utilization of resources, and the process has great significance.
Disclosure of Invention
In order to solve the problem that the existing fine-grain iron concentrate contains more impurities (especially titanium), the invention provides a novel process for reducing titanium in the fine-grain iron concentrate, which can effectively reduce the titanium content in the fine-grain iron concentrate, so that the novel process can be used as a blast furnace smelting raw material of ferrotitanium-containing fine powder, and has the advantages of simple flow, low medicament cost and convenient operation and implementation.
In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that:
a novel process for reducing titanium in fine particle iron ore concentrate extract comprises the following steps:
(1) Superfine grinding: superfine grinding is carried out on the fine-grained iron ore concentrate, and the fineness of the ground ore product is controlled to be more than 95 percent when the occupation ratio of-20 mu m;
(2) Full open circuit short flow reverse flotation after weak magnetic separation: and carrying out conventional weak magnetic separation on the ore pulp after superfine grinding, and carrying out full open circuit short flow reverse flotation on the weak magnetic concentrate to obtain the final iron concentrate.
Further, the fine-grained iron concentrate raw ore has an occupancy of-45 μm of more than 85%, an iron grade of more than 64%, but a high titanium content of more than 4% (as TiO) 2 Meter, the same applies below).
Further, the magnetic field strength of the conventional weak magnetic separation is 1200-1500 Oe. The full open circuit reverse flotation is adopted, so that adverse effects of deteriorating the flotation environment, reducing the concentrate quality and the like caused by the return of middlings to the original flotation flow are avoided.
Further, the weak magnetic concentrate is subjected to full open circuit short flow reverse flotation, generally two sections of open circuit flotation can meet the requirements, the I section reverse flotation concentrate, the II section reverse flotation concentrate and the weak magnetic tailings can be combined to be used as titanium rough concentrate (the titanium rough concentrate can be further concentrated to obtain qualified titanium concentrate products in the follow-up process, and thus comprehensive recycling of resources is realized), the II section reverse flotation tailings are final iron concentrate, and the titanium content of the iron concentrate can be greatly reduced to below 1.5%.
Further, the collecting agent is autonomously compounded and assembled, and the mass component ratio of the novel combined collecting agent NaOL-OHA is as follows: 70-90% sodium oleate (NaOL) and 10-30% Octyl Hydroxamic Acid (OHA). The novel combined collector NaOL-OHA is 80-120 g/t in the reverse flotation of the section I and 40-60 g/t in the reverse flotation of the section II.
Further, the inhibitor modified starch comprises the following components in parts by mass: 50-70% of tapioca starch, 25-35% of hydrogen peroxide and 2-5% of sodium hydroxide, wherein the heating mode adopts microwave heating in the modification process, the microwave power is 400-800W, and the microwave treatment time is 20-90 s. The dosage of the inhibitor modified starch in the reverse flotation of the section I is 1000-1300 g/t, and the dosage of the inhibitor modified starch in the reverse flotation of the section II is 500-650 g/t.
By adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects.
1. Although the low-quality iron ore resource can obtain high-grade iron ore concentrate after beneficiation, the useful mineral is fine in embedded granularity, superfine grinding is needed before entering the magnetic separation, so that the iron ore is fully dissociated, the next weak magnetic separation is facilitated, the impurity titanium content in the iron ore concentrate is primarily reduced, and the quality of the iron ore concentrate is improved.
2. The aim of reducing titanium in the product cannot be completely achieved by single weak magnetic separation, and effective measures are needed to further reduce the titanium content in the iron ore concentrate, so that the deep separation can be achieved by considering reverse flotation of the weak magnetic concentrate based on the principle of less flotation and more inhibition and utilizing the floatability difference of ores. The existing ilmenite flotation process generally adopts closed flotation with one roughing and three fine flotation, and has the defects of long flow, complex process, large dosage of medicament and the like. The new process adopts full open circuit short flow flotation, and generally two sections of open circuit flotation can meet the requirements, thereby avoiding adverse effects of deteriorating flotation environment, reducing concentrate quality and the like caused by the return of middling to the original flotation flow, and having the advantages of simple flow, low medicament cost and convenient operation and implementation.
3. The properties of the flotation reagent have a great influence on the flotation effect, whereas the most important of the reagents for the flotation of ilmenite are collectors. The collector of ilmenite mainly comprises fatty acids, hydroxamic acids, arsinic acids, etc. The fatty acid collector has the advantage of strong collecting capability, but poor selectivity, while the hydroxamic acid collector has high selectivity, but has poorer collecting performance than the fatty acid collector. From this, the new technology collector is independently compound and assembled, and the novel combination collector NaOL-OHA mass component ratio is: 70-90% of sodium oleate (NaOL) and 10-30% of Octyl Hydroxamic Acid (OHA), has the advantages of excellent collecting capacity and strong selectivity, and is beneficial to reducing the titanium content in iron ore concentrate.
4. Starch is a commonly used inhibitor in iron ore flotation and is adsorbed on the surface of iron minerals to enhance their hydrophilicity, thereby inhibiting the upward flotation of the iron minerals. The modified starch can generate chemical groups with stronger polarity, thereby overcoming the defects of the natural starch and enhancing the inhibition effect. Therefore, the new technology selects to oxidize and modify the natural starch to obtain modified starch, and the mass component ratio of the modified starch is as follows: 50-70% of tapioca starch, 25-35% of hydrogen peroxide and 2-5% of sodium hydroxide, the heating mode adopts microwave heating in the modification process, the microwave power is 400-800W, the microwave treatment time is 20-90 s, the reaction time can be obviously shortened, and the process is simplified
By combining the above aspects, the novel process can effectively reduce the titanium content in the iron concentrate on the premise of ensuring the iron recovery rate, and can be used as a blast furnace smelting raw material containing ferrotitanium fine powder. The new process has low cost, simple process and convenient operation and implementation.
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention, without limitation to the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:
FIG. 1 is a process flow diagram of the present invention;
it should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
Example 1
The fine iron concentrate raw ore is taken from the ore of the Maillard Bai Quantie, wherein the occupation rate of-45 mu m is 88%, the iron grade is 64.44%, and the titanium content is 4.18%.
(1) Superfine grinding: superfine grinding is carried out on the fine-grained iron ore concentrate, and the fineness of the ground ore product is controlled to be-20 mu m with the occupation rate of 95 percent;
(2) Full open circuit short flow reverse flotation after weak magnetic separation: conventional weak magnetic separation is carried out on the ore pulp after superfine grinding, the magnetic field intensity is 1200Oe, and then full open circuit short flow reverse flotation is carried out on the weak magnetic concentrate, so that the final iron concentrate can be obtained.
The total open-circuit short-flow reverse flotation can meet the requirements, the I-stage reverse flotation concentrate and the II-stage reverse flotation concentrate can be combined with the weak magnetic tailings to serve as titanium rough concentrate (the titanium rough concentrate can be further concentrated to obtain qualified titanium concentrate products, and comprehensive recycling of resources is achieved), and the II-stage reverse flotation tailings are final iron concentrates.
The consumption of the novel combined collector NaOL-OHA in the I section reverse flotation is 80g/t, and the consumption of the inhibitor modified starch is 1000g/t; in the second stage reverse flotation, the NaOL-OHA dosage of the novel combined collector is 40g/t, and the inhibitor modified starch dosage is 500g/t.
The novel combined collector NaOL-OHA comprises the following components in parts by mass: 70% sodium oleate (NaOL), 30% Octyl Hydroxamic Acid (OHA). The mass component ratio of the inhibitor modified starch is as follows: 60% of tapioca starch, 35% of hydrogen peroxide and 5% of sodium hydroxide. In the modification process of the inhibitor modified starch, the microwave power is 800W, and the microwave treatment time is 20s.
TiO in final iron concentrate 2 Reduced to 1.38%.
Example 2
The fine iron concentrate raw ore is obtained from Kunzing steel Roots iron ore, wherein the occupation rate of-45 mu m is 90%, the iron grade is 64.57%, and the titanium content is 4.23%.
(1) Superfine grinding: superfine grinding is carried out on the fine-grained iron ore concentrate, and the fineness of the ground ore product is controlled to be-20 mu m with the occupancy of 96 percent;
(2) Full open circuit short flow reverse flotation after weak magnetic separation: conventional weak magnetic separation is carried out on the ore pulp after superfine grinding, the magnetic field intensity is 1300Oe, and then full open circuit short flow reverse flotation is carried out on the weak magnetic concentrate, so that the final iron concentrate can be obtained.
The two-stage open-circuit flotation can meet the requirements, the I-stage and II-stage reverse flotation concentrates and the weak magnetic tailings can be combined to be used as titanium rough concentrates (the titanium rough concentrates can be further concentrated to obtain qualified titanium concentrate products, and accordingly comprehensive recycling of resources is achieved), and the II-stage reverse flotation tailings are final iron concentrates.
The consumption of a novel combined collector NaOL-OHA in the I section reverse flotation is 100g/t, and the consumption of inhibitor modified starch is 1100g/t; in the second stage reverse flotation, the NaOL-OHA dosage of the novel combined collector is 50g/t, and the inhibitor modified starch dosage is 550g/t.
The novel combined collector NaOL-OHA comprises the following components in mass percentage: 85% sodium oleate (NaOL), 15% Octyl Hydroxamic Acid (OHA). The mass component ratio of the inhibitor modified starch is as follows: 64% of tapioca starch, 32% of hydrogen peroxide and 4% of sodium hydroxide. In the modification process of the inhibitor modified starch, the microwave power is 600W, and the microwave treatment time is 40s.
TiO in final iron concentrate 2 Reduced to 1.42%.
Example 3
The fine iron concentrate raw ore is obtained from Kunzhishan iron ore, wherein the occupation rate of-45 μm is 92%, the iron grade is 64.89%, and the titanium content is 4.32%.
(1) Superfine grinding: superfine grinding is carried out on the fine-grained iron ore concentrate, and the fineness of the ground ore product is controlled to be 97 percent with the occupation ratio of minus 20 mu m;
(2) Full open circuit short flow reverse flotation after weak magnetic separation: conventional weak magnetic separation is carried out on the ore pulp after superfine grinding, the magnetic field strength is 1400Oe, and then full open circuit short flow reverse flotation is carried out on the weak magnetic concentrate, so that the final iron concentrate can be obtained.
The two-stage open-circuit flotation can meet the requirements, the I-stage and II-stage reverse flotation concentrates and the weak magnetic tailings can be combined to be used as titanium rough concentrates (the titanium rough concentrates can be further concentrated to obtain qualified titanium concentrate products, and accordingly comprehensive recycling of resources is achieved), and the II-stage reverse flotation tailings are final iron concentrates.
The consumption of a novel combined collector NaOL-OHA in the I section reverse flotation is 110g/t, and the consumption of inhibitor modified starch is 1200g/t; in the second stage reverse flotation, the NaOL-OHA dosage of the novel combined collector is 55g/t, and the inhibitor modified starch dosage is 600g/t.
The novel combined collector NaOL-OHA comprises the following components in mass percentage: 80% sodium oleate (NaOL), 20% Octyl Hydroxamic Acid (OHA). The mass component ratio of the inhibitor modified starch is as follows: 67% of tapioca starch, 30% of hydrogen peroxide and 3% of sodium hydroxide. In the modification process of the inhibitor modified starch, the microwave power is 500W, and the microwave treatment time is 60s.
TiO in final iron concentrate 2 Reduced to 1.46%.
Example 4
The fine iron concentrate raw ore is obtained from Yunnan Wenshan iron ore, wherein the occupation rate of-45 mu m is 93%, the iron grade is 65.03%, and the titanium content is 4.38%.
(1) Superfine grinding: superfine grinding is carried out on the fine-grained iron ore concentrate, and the fineness of the ground ore product is controlled to be-20 mu m with the occupancy of 98 percent;
(2) Full open circuit short flow reverse flotation after weak magnetic separation: conventional weak magnetic separation is carried out on the ore pulp after superfine grinding, the magnetic field intensity is 1500Oe, and then full open circuit short flow reverse flotation is carried out on the weak magnetic concentrate, so that the final iron concentrate can be obtained.
The total open-circuit short-flow reverse flotation can meet the requirements, the I-stage reverse flotation concentrate and the II-stage reverse flotation concentrate can be combined with the weak magnetic tailings to serve as titanium rough concentrate (the titanium rough concentrate can be further concentrated to obtain qualified titanium concentrate products, and comprehensive recycling of resources is achieved), and the II-stage reverse flotation tailings are final iron concentrates.
The amount of NaOL-OHA of the novel combined collector in the I-stage reverse flotation is 120g/t, and the amount of modified starch of the inhibitor is 1300g/t; in the second stage reverse flotation, the NaOL-OHA dosage of the novel combined collector is 60g/t, and the inhibitor modified starch dosage is 650g/t.
The novel combined collector NaOL-OHA comprises the following components in mass percentage: 90% sodium oleate (NaOL), 10% Octyl Hydroxamic Acid (OHA). The mass component ratio of the inhibitor modified starch is as follows: 70% of tapioca starch, 28% of hydrogen peroxide and 2% of sodium hydroxide. In the modification process of the inhibitor modified starch, the microwave power is 400W, and the microwave treatment time is 90s.
TiO in final iron concentrate 2 Reduced to 1.48%.
The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the invention, may be made by those skilled in the art without departing from the scope of the invention.
Claims (5)
1. The novel process for reducing titanium in the fine-grained iron concentrate extract is characterized by comprising the following steps of:
step (1), superfine grinding: superfine grinding is carried out on the fine-grained iron ore concentrate, and the fineness of the ground ore product is controlled to be more than 95 percent when the occupation ratio of-20 mu m;
step (2), full open circuit short flow reverse flotation after weak magnetic separation: conventional weak magnetic separation is carried out on the ore pulp after superfine grinding, and then full-open short-process reverse flotation is carried out on the weak magnetic concentrate, so that the final iron concentrate can be obtained;
the short-process reverse flotation comprises two sections of open-circuit flotation, wherein the I section reverse flotation concentrate, the II section reverse flotation concentrate and the weak magnetic tailings are combined to be used as titanium rough concentrate, the II section reverse flotation tailings are final iron concentrate, and the titanium content of the iron concentrate is greatly reduced to below 1.5%; the collector used in reverse flotation is a novel combined collector NaOL-OHA, and the mass component ratio of the novel combined collector NaOL-OHA is as follows: 70-90% sodium oleate (NaOL), 10-30% Octyl Hydroxamic Acid (OHA); the inhibitor used in the reverse flotation is modified starch, and the mass component ratio of the modified starch is as follows: 50-70% of tapioca starch, 25-35% of hydrogen peroxide and 2-5% of sodium hydroxide.
2. The novel process for reducing titanium in fine iron ore concentrate extract according to claim 1, which is characterized in that: the occupation rate of-45 mu m in the fine particle iron concentrate raw ore is more than 85%, the iron grade of the fine particle iron concentrate raw ore is more than 64%, and the titanium content is more than 4%.
3. The novel process for reducing titanium in fine iron ore concentrate extract according to claim 1, which is characterized in that: the novel combined collector NaOL-OHA is 80-120 g/t in the reverse flotation of the section I and 40-60 g/t in the reverse flotation of the section II.
4. The novel process for reducing titanium in fine iron ore concentrate extract according to claim 1, which is characterized in that: the modified starch is heated by microwaves in the modification process, the microwave power is 400-800W, and the microwave treatment time is 20-90 s.
5. The novel process for reducing titanium in fine iron ore concentrate extract according to claim 4, which is characterized in that: the dosage of the inhibitor in the reverse flotation of the section I is 1000-1300 g/t, and the dosage of the inhibitor in the reverse flotation of the section II is 500-650 g/t.
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