Vanadium titano-magnetite iron-titanium co-separation method based on magnetic separation-flotation synergistic effect

Abstract

The invention relates to the technical field of vanadium titano-magnetite beneficiation, in particular to a vanadium titano-magnetite iron-titanium co-separation method based on a magnetic separation-flotation synergistic effect, which comprises the following steps: after grinding raw ore, carrying out wet-type low-intensity magnetic separation to obtain iron rough concentrate and iron separation tailings 1; after grinding the rough iron concentrate, performing wet low-intensity magnetic separation to obtain iron concentrate and iron separation tailings 2; mixing the iron separation tailings, and performing strong magnetic roughing to obtain strong magnetic concentrate 1 and strong magnetic tailings 1; performing strong magnetic concentration on the strong magnetic concentrate 1 to obtain strong magnetic concentrate 2 and strong magnetic tailings 2; the strong magnetic tailings 2 are subjected to strong magnetic scavenging, and scavenged concentrate and scavenged tailings are obtained; mixing the iron ore concentrate, the strong magnetic concentrate 2 and the scavenged concentrate, adjusting the pulp concentration, and desulfurizing to obtain desulfurized concentrate and desulfurized tailings; adjusting the pulp concentration of the desulfurized tailings, and then carrying out combined flotation to obtain iron-titanium concentrate and flotation tailings; and mixing the strong magnetic tailings 1, the scavenging tailings and the flotation tailings to obtain total tailings. According to the method, the synergistic effect of magnetic separation and flotation is utilized, the technological process is simple, iron and titanium in the vanadium titano-magnetite can be recovered at the same time, and the iron and titanium recovery rate is high.

Description

Technical Field

[0001] The present application relates to the technical field of vanadium-titanium magnetite beneficiation, and in particular to a method for co-selecting iron and titanium from vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation. Background Art

[0002] Vanadium-titanium magnetite is an important strategic resource in my country, primarily existing in the form of titanomagnetite and ilmenite. The current mainstream beneficiation process is "stage grinding for iron separation - strong magnetic separation + flotation for titanium separation," whereby titanomagnetite is recovered through magnetic separation, and ilmenite is recovered from the tailings through high-gradient magnetic separation and flotation. However, this process has the following key issues:

[0003] (1) Serious loss of fine-grained ilmenite. Existing high-intensity magnetic separation equipment has poor selectivity for -38μm fine-grained ilmenite. When the background magnetic field intensity is low, it cannot effectively capture particles. However, high magnetic fields easily adsorb gangue minerals, resulting in the loss of fine-grained ilmenite in the form of sludge or overflow.

[0004] (2) Insufficient flotation recovery rate. Conventional flotation machines have a weak ability to collect fine-grained ilmenite and require high-dose reagents for enhancement. However, existing collectors (such as butyl xanthate) are easily affected by ore slime and multi-metal ion coverage, resulting in a low recovery rate of titanium concentrate.

[0005] (3) The process is complex and the separation efficiency is low. The traditional process uses multiple stages of magnetic separation and flotation in series, but the close symbiosis of ilmenite and titanomagnetite makes it difficult to achieve efficient separation through physical separation. It is necessary to rely on a chemical-physical combined process, but there are problems such as high cost and complex operation. For example, although the non-blast furnace direct reduction-grinding method can improve the separation efficiency of iron and titanium, the high energy consumption and reducing agent cost limit its industrial application.

[0006] In recent years, new beneficiation processes for vanadium-titanium magnetite have emerged. For example, Li Yuankun et al. disclosed in CN 102179292B a method for separating and extracting iron, vanadium, and titanium from vanadium-titanium magnetite, comprising: magnetic separation of ore: vanadium-titanium magnetite is subjected to magnetic separation to obtain iron-vanadium concentrate and tailings; tailings separation and titanium concentrate: the tailings are subjected to flotation to obtain titanium concentrate; titanium concentrate roasting and magnetic separation: the titanium concentrate is roasted and then subjected to titanium-enriched magnetic separation; iron-vanadium concentrate beneficiation: the iron-vanadium concentrate obtained by magnetic separation is subjected to a further magnetic separation; reduction smelting: the titanium concentrate obtained by the above impurity removal treatment is mixed according to the beneficiation yield ratio, and a reducing agent and soda ash are added to reduce iron and vanadium smelting; titanium slag purification: the titanium slag obtained by reduction smelting is subjected to acid leaching to remove impurities to obtain a high-quality titanium slag product with a TiO2 content of >92%; and vanadium extraction from pig iron: the vanadium-containing pig iron obtained by reduction smelting is subjected to converter vanadium extraction to obtain semi-steel and vanadium slag. This method can improve the utilization rate of titanium, iron, and vanadium, and can produce a high-titanium slag product with a TiO2 content greater than 92%, broadening the application range of titanium. However, this technology requires first obtaining iron concentrate with a TFe grade greater than 58% and titanium concentrate with a TiO2 grade greater than 46% through mineral processing. The preparation conditions are relatively harsh and the preparation process is overly complex.

[0007] Therefore, a new beneficiation process for vanadium-titanium magnetite is needed to achieve efficient co-selection of iron and titanium resources in vanadium-titanium magnetite, while simplifying the process and reducing energy consumption. Summary of the Invention

[0008] The purpose of this application is to overcome the shortcomings of the existing technology and provide a method for co-selection of iron and titanium from vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation. This method utilizes the synergistic effect of magnetic separation and flotation, which can not only simultaneously recover iron and titanium in vanadium-titanium magnetite, but also has a high iron and titanium recovery rate and a simple process flow.

[0009] The object of the present invention is achieved through the following technical solutions:

[0010] The present invention provides a method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation, comprising the following steps:

[0011] S1. The vanadium-titanium magnetite ore is crushed to -3 mm and then subjected to a first grinding to obtain a ground product 1;

[0012] S2. The product 1 is subjected to a wet weak magnetic roughing operation to obtain a coarse iron concentrate and an iron tailings 1;

[0013] S3. After the second grinding of the iron ore concentrate, the ground product 2 is obtained;

[0014] S4. The product 2 is subjected to wet weak magnetic separation and concentrating operation to obtain iron concentrate and iron tailings 2;

[0015] S5. The iron ore tailings 1 and the iron ore tailings 2 are mixed and subjected to strong magnetic roughing operations to obtain a strong magnetic concentrate 1 and a strong magnetic tailings 1;

[0016] S6. The strong magnetic concentrate 1 is subjected to a strong magnetic separation operation to obtain a strong magnetic concentrate 2 and a strong magnetic tailings 2;

[0017] S7. The strong magnetic tailings 2 are subjected to strong magnetic separation and scavenging operations to obtain strong magnetic scavenging concentrates and strong magnetic scavenging tailings;

[0018] S8. The iron concentrate, the strong magnetic concentrate 2 and the strong magnetic scavenging concentrate are mixed and the slurry concentration is adjusted, and then desulfurization operation is performed to obtain desulfurized concentrate and desulfurized tailings;

[0019] S9. After adjusting the slurry concentration of the desulfurized tailings, an iron-titanium combined flotation operation is performed to obtain an iron-titanium mixed concentrate and flotation tailings;

[0020] S10. The strong magnetic tailings 1, the strong magnetic scavenging tailings and the flotation tailings are mixed to obtain total tailings.

[0021] In the above technical scheme, the raw ore comprehensive sample is subjected to grinding-magnetic separation to obtain iron concentrate and iron tailings, the iron tailings are subjected to strong magnetic separation to obtain strong magnetic concentrate, the iron concentrate and strong magnetic concentrate are mixed and then subjected to desulfurization-mixed flotation to obtain iron-titanium mixed concentrate. This scheme adopts the process of iron-titanium co-selection to fully recover the titanium in the iron concentrate and the iron in the titanium concentrate, which can greatly improve the utilization rate of iron and titanium resources in vanadium-titanium magnetite.

[0022] Furthermore, the first grinding and the second grinding are performed by ball milling.

[0023] Furthermore, in S1, the particle size of the ground product 1 is -0.074 mm, accounting for 50% to 65%.

[0024] Furthermore, in S4, the particle size of the ground product 2 is -0.074 mm, accounting for 75% to 85%.

[0025] Furthermore, in S2, the pulp concentration in the wet weak magnetic roughing operation is 20% to 25%.

[0026] Furthermore, in S4, the pulp concentration in the wet weak magnetic separation operation is 20% to 25%.

[0027] Furthermore, in S2, the magnetic field strength of the wet weak magnetic separation roughing operation is 2500-3500 GS.

[0028] Furthermore, in S4, the magnetic field strength of the wet weak magnetic separation operation is 1500-2500 GS.

[0029] Furthermore, the equipment used in the high-intensity magnetic separation roughing operation, the high-intensity magnetic separation finishing operation and the high-intensity magnetic separation scavenging operation is a vertical ring pulsating high-gradient high-intensity magnetic separator.

[0030] Furthermore, in S5, the magnetic field strength of the high-intensity magnetic separation roughing operation is 557.2-716.4 kA / ml.

[0031] Furthermore, in S6, the magnetic field strength of the strong magnetic separation operation is 398.0 to 577.2 kA / m.

[0032] Furthermore, in S7, the magnetic field intensity of the strong magnetic separation and sweeping operation is 477.6-636.8 kA / m.

[0033] Furthermore, in S8, the desulfurization operation adopts a method including flotation desulfurization.

[0034] Furthermore, in S8, the slurry concentration of the desulfurization operation is 25% to 40%.

[0035] Furthermore, in S8, the pH value of the desulfurization operation is 6-7.

[0036] Furthermore, in S8, the pH adjuster of the desulfurization operation is sulfuric acid, the collector includes one of butyl xanthate, amyl xanthate and butylamine black medicine, and the foaming agent is 2# oil.

[0037] Preferably, the amount of the collector and the foaming agent is as follows: 200 g of the collector and 20 g of the foaming agent are added per 1 t of the vanadium-titanium magnetite ore.

[0038] Furthermore, in S9, the pulp concentration of the iron-titanium combined flotation operation is 20% to 30%.

[0039] Furthermore, in S9, the pH value of the iron-titanium combined flotation operation is 2.5-4.0.

[0040] Furthermore, in S9, the pH adjuster of the iron-titanium combined flotation operation is sulfuric acid, the inhibitor includes one of oxalic acid, water glass, and sodium fluorosilicate, the collector includes MOH, and the auxiliary collector includes diesel.

[0041] Preferably, the dosage of the inhibitor, the collector and the auxiliary collector is: 1000 g of the inhibitor, 2500 g of the collector and 200 g of the auxiliary collector are added per 1 t of the vanadium-titanium magnetite ore.

[0042] The beneficial effects of the present invention are:

[0043] 1. The method of the present application can significantly improve the utilization rate of iron and titanium resources in vanadium-titanium magnetite, and obtain an iron-titanium mixed concentrate with a TFe grade of >46% and a TiO2 grade of >22%, providing high-quality raw materials for the subsequent mixed smelting process of vanadium-titanium magnetite;

[0044] 2. The present application adopts an iron-titanium co-selection process. Compared with the existing process, it is not necessary to select iron concentrate with TFe grade > 58% and titanium concentrate with TiO2 grade > 46%. It is only necessary to obtain an iron-titanium mixed concentrate with TFe grade > 46% and TiO2 grade > 22%;

[0045] 3. Compared with the existing process, the method of the present application shortens the process flow and involves simpler equipment, which can reduce the investment in industrial equipment. In addition, the process route is clean and environmentally friendly, providing a better process technology for the development and utilization of vanadium-titanium magnetite. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a process flow chart for the co-selection of iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation in this application. DETAILED DESCRIPTION

[0047] The technical solution of the present application is described in further detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0048] The following is a method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation in this application:

[0049] S1. The vanadium-titanium magnetite ore was crushed to -3 mm and then ball milled to -0.074 mm with a content of 50% to 65% to obtain product 1;

[0050] S2. The product 1 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 2500 to 3500 GS, with a slurry concentration of 20% to 25% to obtain a coarse iron concentrate and an iron ore tailings 1;

[0051] S3. The coarse iron concentrate is ball milled to -0.074mm with a content of 75% to 85% to obtain product 2;

[0052] S4. The product 2 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 1500 to 2500 GS, the slurry concentration being 20% ​​to 25%, to obtain an iron concentrate and an iron ore tailings 2;

[0053] S5. The iron ore tailings 1 and the iron ore tailings 2 are mixed and subjected to a strong magnetic roughing operation using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 557.2 to 716.4 kA / m to obtain a strong magnetic concentrate 1 and a strong magnetic tailings 1;

[0054] S6. The strong magnetic concentrate 1 is subjected to a strong magnetic separation operation using a vertical ring pulsating high gradient strong magnetic separator at a magnetic field strength of 398.0 to 577.2 kA / m to obtain a strong magnetic concentrate 2 and a strong magnetic tailings 2;

[0055] S7. The strong magnetic tailings 2 are subjected to strong magnetic separation and scavenging operations using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 477.6 to 636.8 kA / m to obtain a strong magnetic scavenging concentrate and a strong magnetic scavenging tailings;

[0056] S8. After mixing the iron concentrate, the strong magnetic concentrate 2 and the strong magnetic scavenging concentrate, the mixture is used as the raw material for the desulfurization operation, the slurry concentration of the mixture is adjusted to 25% to 40%, sulfuric acid is added to adjust the pH value to 6 to 7, and 200g / t of butyl xanthate, amyl xanthate and butylamine black medicine is added as a collector based on the mass of the vanadium titanomagnetite ore, and 20g / t of 2 is added. # Oil is used as a foaming agent for conventional flotation desulfurization operations to obtain desulfurized concentrate and desulfurized tailings;

[0057] S9. Using the desulfurized tailings as the raw material for the iron-titanium combined flotation operation, adjusting the pulp concentration of the desulfurized tailings to 20% to 30%, adding sulfuric acid to adjust the pH value to 2.5 to 4.5, calculating the mass of the vanadium-titanium magnetite ore, adding oxalic acid, water glass, and sodium fluorosilicate as an inhibitor, 2500g / t of MOH as a collector, and 200g / t of diesel as an auxiliary collector to perform an iron-titanium combined flotation operation to obtain an iron-titanium mixed concentrate and flotation tailings;

[0058] S10. The strong magnetic tailings 1, the strong magnetic scavenging tailings and the flotation tailings are mixed to obtain total tailings.

[0059] In order to demonstrate the effect of co-selection of iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation in this application, this application will be based on the above steps and set up Examples 1 to 3 in a preferred scheme to carry out iron and titanium co-selection on ores of different grades respectively, and at the same time set up Comparative Examples 1 to 6 to highlight the effect produced by the scheme of this application.

[0060] Example 1

[0061] The following steps are used to carry out iron-titanium co-selection of vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation:

[0062] S1. The vanadium-titanium magnetite ore with a TFe grade of 20.10% and a TiO2 grade of 9.24% was crushed to -3mm and then ball milled to -0.074mm with a content of 50% to obtain product 1;

[0063] S2. The product 1 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 3000GS, with a slurry concentration of 20% to obtain a coarse iron concentrate and an iron ore tailings 1;

[0064] S3. The coarse iron concentrate was ball milled to -0.074mm with a content of 80% to obtain product 2;

[0065] S4. The product 2 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 2000GS, the slurry concentration being 20%, to obtain an iron concentrate and an iron ore tailings 2;

[0066] S5. The iron ore tailings 1 and the iron ore tailings 2 are mixed and subjected to a strong magnetic roughing operation using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 636.8kA / m to obtain a strong magnetic concentrate 1 and a strong magnetic tailings 1;

[0067] S6. The strong magnetic concentrate 1 is subjected to a strong magnetic separation operation using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 477.6kA / m to obtain a strong magnetic concentrate 2 and a strong magnetic tailings 2;

[0068] S7. The strong magnetic tailings 2 are subjected to strong magnetic separation and scavenging operations using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 557.2kA / m to obtain a strong magnetic scavenging concentrate and a strong magnetic scavenging tailings;

[0069] S8. After mixing the iron concentrate, the strong magnetic concentrate 2 and the strong magnetic scavenging concentrate, the mixture is used as the raw material for the desulfurization operation, the slurry concentration of the mixture is adjusted to 30%, sulfuric acid is added to adjust the pH value to 6.5, and 200g / t butyl xanthate is added as a collector based on the mass of the vanadium titanomagnetite ore, and 20g / t of 2 is added. # Oil is used as a foaming agent for conventional flotation desulfurization operations to obtain desulfurized concentrate and desulfurized tailings;

[0070] S9. Using the desulfurized tailings as the raw material for the iron-titanium combined flotation operation, the pulp concentration of the desulfurized tailings was adjusted to 28%, sulfuric acid was added to adjust the pH to 3.5, and 1000 g / t of sodium fluorosilicate was added as an inhibitor, 2500 g / t of MOH as a collector, and 200 g / t of diesel as a subsequent iron-titanium combined flotation operation to obtain an iron-titanium mixed concentrate and flotation tailings.

[0071] S10. The strong magnetic tailings 1, the strong magnetic scavenging tailings and the flotation tailings are mixed to obtain total tailings.

[0072] Through the above-mentioned vanadium-titanium magnetite iron-titanium co-selection method based on the synergistic effect of magnetic separation and flotation, an iron-titanium mixed concentrate with a TFe grade of 46.87%, a TiO2 grade of 20.38%, a TFe recovery rate of 66.87%, and a TiO2 recovery rate of 66.07% can be finally obtained.

[0073] Example 2

[0074] The following steps are used to carry out iron-titanium co-selection of vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation:

[0075] S1. The vanadium-titanium magnetite ore with a TFe grade of 20.10% and a TiO2 grade of 9.24% was crushed to -3mm and then ball milled to -0.074mm with a content of 50% to obtain product 1;

[0076] S2. The product 1 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 3000GS, with a slurry concentration of 20% to obtain a coarse iron concentrate and an iron ore tailings 1;

[0077] S3. The coarse iron concentrate was ball milled to -0.074mm with a content of 80% to obtain product 2;

[0078] S4. The product 2 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 2000GS, the slurry concentration being 20%, to obtain an iron concentrate and an iron ore tailings 2;

[0079] S5. The iron ore tailings 1 and the iron ore tailings 2 are mixed and subjected to a strong magnetic roughing operation using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 636.8kA / m to obtain a strong magnetic concentrate 1 and a strong magnetic tailings 1;

[0080] S6. The strong magnetic concentrate 1 is subjected to a strong magnetic separation operation using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 477.6kA / m to obtain a strong magnetic concentrate 2 and a strong magnetic tailings 2;

[0081] S7. The strong magnetic tailings 2 are subjected to strong magnetic separation and scavenging operations using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 557.2kA / m to obtain a strong magnetic scavenging concentrate and a strong magnetic scavenging tailings;

[0082] S8. After mixing the iron concentrate, the strong magnetic concentrate 2 and the strong magnetic scavenging concentrate, the mixture is used as the raw material for the desulfurization operation, the slurry concentration of the mixture is adjusted to 30%, sulfuric acid is added to adjust the pH value to 6.5, and 200g / t butyl xanthate is added as a collector based on the mass of the vanadium titanomagnetite ore, and 20g / t of 2 is added. # Oil is used as a foaming agent for conventional flotation desulfurization operations to obtain desulfurized concentrate and desulfurized tailings;

[0083] S9. Using the desulfurized tailings as the raw material for the iron-titanium combined flotation operation, the pulp concentration of the desulfurized tailings was adjusted to 28%, sulfuric acid was added to adjust the pH to 3.5, and 1000 g / t of sodium fluorosilicate was added as an inhibitor, 2500 g / t of MOH as a collector, and 200 g / t of diesel as a subsequent iron-titanium combined flotation operation to obtain an iron-titanium mixed concentrate and flotation tailings.

[0084] S10. The strong magnetic tailings 1, the strong magnetic scavenging tailings and the flotation tailings are mixed to obtain total tailings.

[0085] Through the above-mentioned vanadium-titanium magnetite iron-titanium co-selection method based on the synergistic effect of magnetic separation and flotation, an iron-titanium mixed concentrate with a TFe grade of 47.21%, a TiO2 grade of 20.97%, a TFe recovery rate of 68.92%, and a TiO2 recovery rate of 67.84% can be finally obtained.

[0086] Example 3

[0087] The following steps are used to carry out iron-titanium co-selection of vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation:

[0088] S1. The vanadium-titanium magnetite ore with a TFe grade of 20.10% and a TiO2 grade of 9.24% was crushed to -3mm and then ball milled to -0.074mm with a content of 50% to obtain product 1;

[0089] S2. The product 1 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 3000GS, with a slurry concentration of 20% to obtain a coarse iron concentrate and an iron ore tailings 1;

[0090] S3. The coarse iron concentrate was ball milled to -0.074mm with a content of 80% to obtain product 2;

[0091] S4. The product 2 is subjected to a weak magnetic separation operation using a wet weak magnetic separator at a magnetic field strength of 2000GS, the slurry concentration being 20%, to obtain an iron concentrate and an iron ore tailings 2;

[0092] S5. The iron ore tailings 1 and the iron ore tailings 2 are mixed and subjected to a strong magnetic roughing operation using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 636.8kA / m to obtain a strong magnetic concentrate 1 and a strong magnetic tailings 1;

[0093] S6. The strong magnetic concentrate 1 is subjected to a strong magnetic separation operation using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 477.6kA / m to obtain a strong magnetic concentrate 2 and a strong magnetic tailings 2;

[0094] S7. The strong magnetic tailings 2 are subjected to strong magnetic separation and scavenging operations using a vertical ring pulsating high gradient magnetic separator at a magnetic field strength of 557.2kA / m to obtain a strong magnetic scavenging concentrate and a strong magnetic scavenging tailings;

[0095] S8. After mixing the iron concentrate, the strong magnetic concentrate 2 and the strong magnetic scavenging concentrate, the mixture is used as the raw material for the desulfurization operation, the slurry concentration of the mixture is adjusted to 30%, sulfuric acid is added to adjust the pH value to 6.5, and 200g / t butyl xanthate is added as a collector based on the mass of the vanadium titanomagnetite ore, and 20g / t of 2 is added. # Oil is used as a foaming agent for conventional flotation desulfurization operations to obtain desulfurized concentrate and desulfurized tailings;

[0096] S9. Using the desulfurized tailings as the raw material for the iron-titanium combined flotation operation, the pulp concentration of the desulfurized tailings was adjusted to 28%, sulfuric acid was added to adjust the pH to 3.5, and 1000 g / t of sodium fluorosilicate was added as an inhibitor, 2500 g / t of MOH as a collector, and 200 g / t of diesel as a subsequent iron-titanium combined flotation operation to obtain an iron-titanium mixed concentrate and flotation tailings.

[0097] S10. The strong magnetic tailings 1, the strong magnetic scavenging tailings and the flotation tailings are mixed to obtain total tailings.

[0098] Through the above-mentioned vanadium-titanium magnetite iron-titanium co-selection method based on the synergistic effect of magnetic separation and flotation, an iron-titanium mixed concentrate with a TFe grade of 46.36%, a TiO2 grade of 20.17%, a TFe recovery rate of 65.79%, and a TiO2 recovery rate of 65.56% can be finally obtained.

[0099] Comparative Example 1

[0100] Comparative Example 1 The steps of conducting iron-titanium co-selection based on the magnetic separation-flotation synergistic effect on vanadium-titanium magnetite are referred to Example 1; wherein, the difference between Comparative Example 1 and Example 1 is only that:

[0101] In S1, the vanadium titanomagnetite ore crushed to -3 mm is ball milled to -0.074 mm with a content of 45%.

[0102] According to the method of comparative example 1, an iron-titanium mixed concentrate with a TFe grade of 46.97%, a TiO2 grade of 17.17%, a TFe recovery rate of 57.75%, and a TiO2 recovery rate of 50.18% can be finally obtained.

[0103] Comparative Example 2

[0104] Comparative Example 2 The steps of conducting iron-titanium co-selection based on the magnetic separation-flotation synergistic effect on vanadium-titanium magnetite are referred to Example 1; wherein, the difference between Comparative Example 2 and Example 1 is only that:

[0105] In S3, the iron concentrate is ball-milled to a particle size of -0.074 mm with a content of 70%.

[0106] According to the method of Comparative Example 2, an iron-titanium mixed concentrate with a TFe grade of 46.85%, a TiO2 grade of 19.72%, a TFe recovery rate of 59.59%, and a TiO2 recovery rate of 58.29% can be finally obtained.

[0107] Comparative Example 3

[0108] Comparative Example 3 The steps of conducting iron-titanium co-selection based on the magnetic separation-flotation synergistic effect on vanadium-titanium magnetite are referred to Example 1; wherein, the difference between Comparative Example 3 and Example 1 is only that:

[0109] In S5, the magnetic field strength of the high-intensity magnetic separation roughing is 796 kA / m.

[0110] According to the method of Comparative Example 3, an iron-titanium mixed concentrate with a TFe grade of 48.66%, a TiO2 grade of 18.13%, a TFe recovery rate of 68.62%, and a TiO2 recovery rate of 64.98% can be finally obtained.

[0111] Comparative Example 4

[0112] Comparative Example 4 The steps of conducting iron-titanium co-selection based on the magnetic separation-flotation synergistic effect on vanadium-titanium magnetite are referred to Example 1; wherein, the difference between Comparative Example 4 and Example 1 is only that:

[0113] In S5, the magnetic field strength of the high-intensity magnetic separation roughing is 477.6 kA / m.

[0114] According to the method of Comparative Example 4, an iron-titanium mixed concentrate with a TFe grade of 47.02%, a TiO2 grade of 20.54%, a TFe recovery rate of 60.55%, and a TiO2 recovery rate of 60.12% can be finally obtained.

[0115] Comparative Example 5

[0116] Comparative Example 5 The steps of conducting iron-titanium co-selection based on the magnetic separation-flotation synergistic effect on vanadium-titanium magnetite are referred to Example 1; wherein, the difference between Comparative Example 5 and Example 1 is only that:

[0117] In S6, the magnetic field strength of the strong magnetic separation is 636.8 kA / m.

[0118] According to the method of Comparative Example 6, an iron-titanium mixed concentrate with a TFe grade of 49.26%, a TiO2 grade of 18.72%, a TFe recovery rate of 68.05%, and a TiO2 recovery rate of 64.06% can be finally obtained.

[0119] Comparative Example 6

[0120] Comparative Example 6 The steps of conducting iron-titanium co-selection based on the magnetic separation-flotation synergistic effect on vanadium-titanium magnetite are referred to Example 1; wherein, the difference between Comparative Example 6 and Example 1 is only that:

[0121] In S6, the magnetic field strength of the strong magnetic separation is 318.4 kA / m.

[0122] According to the method of Comparative Example 6, an iron-titanium mixed concentrate with a TFe grade of 46.91%, a TiO2 grade of 20.48%, a TFe recovery rate of 61.86%, and a TiO2 recovery rate of 61.38% can be finally obtained.

[0123] The above description is merely a preferred embodiment of the present application. It should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be protected by the claims appended hereto.

Claims

1. A method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation, characterized in that: The following steps are involved: S1. The vanadium-titanium magnetite ore is crushed to -3 mm and then subjected to a first grinding to obtain a ground product 1; S2. The product 1 is subjected to a wet weak magnetic roughing operation to obtain a coarse iron concentrate and an iron ore tailings 1; S3. After the second grinding of the coarse iron concentrate, the grinding product 2 is obtained; S4. The product 2 is subjected to wet weak magnetic separation and concentrating operation to obtain iron concentrate and iron tailings 2; S5. The iron ore tailings 1 and the iron ore tailings 2 are mixed and subjected to strong magnetic roughing operations to obtain a strong magnetic concentrate 1 and a strong magnetic tailings 1; S6. The strong magnetic concentrate 1 is subjected to a strong magnetic separation operation to obtain a strong magnetic concentrate 2 and a strong magnetic tailings 2; S7. The strong magnetic tailings 2 are subjected to strong magnetic separation and scavenging operations to obtain strong magnetic scavenging concentrates and strong magnetic scavenging tailings; S8. The iron concentrate, the strong magnetic concentrate 2 and the strong magnetic scavenging concentrate are mixed and the slurry concentration is adjusted, and then desulfurization operation is performed to obtain desulfurized concentrate and desulfurized tailings; S9. After adjusting the slurry concentration of the desulfurized tailings, an iron-titanium combined flotation operation is performed to obtain an iron-titanium mixed concentrate and flotation tailings; S10. The strong magnetic tailings 1, the strong magnetic scavenging tailings and the flotation tailings are mixed to obtain total tailings.

2. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: The methods used for the first grinding and the second grinding include ball milling; And / or, in S1, the particle size of the ground product 1 is -0.074 mm, accounting for 50% to 65%; And / or, in S4, the particle size of the ground product 2 is -0.074 mm, accounting for 75% to 85%.

3. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: In S2, the pulp concentration in the wet weak magnetic roughing operation is 20% to 25%; And / or, in S4, the pulp concentration in the wet weak magnetic separation operation is 20% to 25%.

4. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: In S2, the magnetic field strength of the wet weak magnetic separation roughing operation is 2500-3500 GS; And / or, in S4, the magnetic field strength of the wet weak magnetic separation operation is 1500-2500 GS.

5. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: The equipment used in the strong magnetic roughing operation, the strong magnetic cleaning operation and the strong magnetic sweeping operation is a vertical ring pulsating high gradient strong magnetic separator; and / or, in S5, the magnetic field strength of the high-intensity magnetic separation roughing operation is 557.2 to 716.4 kA / ml; and / or, in S6, the magnetic field strength of the high-intensity magnetic separation operation is 398.0 to 577.2 kA / m; And / or, in S7, the magnetic field strength of the high-intensity magnetic separation and sweeping operation is 477.6-636.8 kA / m.

6. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: In S8, the desulfurization operation adopts a method including flotation desulfurization.

7. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: In S8, the slurry concentration of the desulfurization operation is 25% to 40%; And / or, in S8, the pH value of the desulfurization operation is 6-7.

8. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: In S8, the pH adjuster of the desulfurization operation is sulfuric acid, the collector includes one of butyl xanthate, amyl xanthate and butylamine black medicine, and the foaming agent is 2 # Oil; The amount of the collector and the foaming agent is as follows: 200g of the collector and 20g of the foaming agent are added per 1t of the vanadium-titanium magnetite ore.

9. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: In S9, the pulp concentration of the iron-titanium combined flotation operation is 20% to 30%; And / or, in S9, the pH value of the iron-titanium combined flotation operation is 2.5-4.

5.

10. The method for co-selecting iron and titanium in vanadium-titanium magnetite based on the synergistic effect of magnetic separation and flotation according to claim 1, characterized in that: In S9, the pH adjuster of the iron-titanium combined flotation operation is sulfuric acid, the inhibitor includes one of oxalic acid, water glass, and sodium fluorosilicate, the collector includes MOH, and the auxiliary collector includes diesel; The dosage of the inhibitor, the collector and the auxiliary collector is as follows: 1000g of the inhibitor, 2500g of the collector and 200g of the auxiliary collector are added per 1t of the vanadium-titanium magnetite ore.

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