A high-efficiency magnetic separation method for titanium concentrate

Abstract

The present invention relates to the field of magnetic ore separation technology, and in particular to a high-efficiency magnetic separation method for titanium concentrate. The technical key points are as follows: the titanium concentrate includes at least one of magnetic titanium concentrate, iron-containing mineral impurities, non-magnetic minerals and other non-magnetic impurities; the method comprises: performing weak magnetic separation on the titanium concentrate to obtain a first separation and a strongly magnetic iron-containing mineral impurity; performing component analysis on the first separation, and if the Fe in the first separation is 3+ The content of is greater than a first preset value, first magnetic particles and second magnetic particles are added to obtain a first magnetized separation; the first magnetized separation is subjected to a first strong magnetic separation to obtain a second separation, non-magnetic minerals and other non-magnetic impurities; the second separation is acidified and subjected to a second strong magnetic separation to obtain magnetic titanium concentrate and iron-based weakly magnetic mineral impurities; the non-magnetic minerals and other non-magnetic impurities are subjected to solid-liquid separation to obtain non-magnetic titanium concentrate.

Description

Technical Field

[0001] The present invention relates to the technical field of ore concentration, and in particular to a high-efficiency magnetic separation method for titanium concentrate. Background Art

[0002] Magnetic separation of titanium concentrate is a key method for extracting titanium minerals, particularly for separating magnetic titanium concentrate from other impurities. Magnetic separation primarily utilizes the magnetic properties of minerals to separate titanium minerals from gangue minerals. During the magnetic separation of titanium concentrate, the appropriate magnetic separation method must be selected based on the specific properties of the ore (such as mineral composition and particle size). Sometimes, it is also necessary to combine it with other beneficiation methods such as gravity separation and flotation to achieve optimal separation results.

[0003] As high-grade ore resources gradually decrease, the beneficiation process increasingly requires processing low-grade and complex ores. These ores contain low concentrations of target minerals, high levels of impurities, and fine mineral distribution. This makes it difficult for magnetic separation to effectively separate the target minerals, resulting in reduced beneficiation efficiency and concentrate grade.

[0004] In particular, the subtle magnetic differences between some minerals make them difficult to separate effectively during magnetic separation. For example, the small magnetic difference between magnetic titanium concentrate and some iron-containing impurities (such as pseudo-hematite) makes traditional magnetic separation difficult to achieve, resulting in high impurity levels in the concentrate. Improving the precision of magnetic separation equipment and enhancing the ability to separate minerals with subtle magnetic differences is an important research direction for improving the effectiveness of magnetic separation processes. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-efficiency magnetic separation method for titanium concentrate, which can more finely separate magnetic titanium concentrate, iron-based weak magnetic mineral impurities, non-magnetic minerals and other non-magnetic impurities by introducing multiple magnetic separation steps, including weak magnetic separation, strong magnetic separation and multiple magnetization separation. This multi-stage separation process can significantly improve the purity of titanium concentrate. 3+ The use of content-adjusting magnetic particles can specifically process minerals with different impurity contents, further improving the accuracy and effect of sorting.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] The present invention provides a high-efficiency magnetic separation method for titanium concentrate, wherein the titanium concentrate includes at least one of magnetic titanium concentrate, iron-containing mineral impurities, non-magnetic minerals and other non-magnetic impurities;

[0008] The method comprises:

[0009] Conducting weak magnetic separation on the titanium concentrate to obtain the first separation product and strongly magnetic iron-containing mineral impurities;

[0010] The first sorted material is subjected to component analysis. If Fe 3+ The content of is greater than a first preset value, adding first magnetic particles and second magnetic particles to obtain a first magnetic separation product;

[0011] Performing a first strong magnetic separation on the first magnetized separated product to obtain a second separated product, non-magnetic minerals and other non-magnetic impurities;

[0012] The second separated product is subjected to acidification treatment and second strong magnetic separation to obtain magnetic titanium concentrate and iron-based weakly magnetic mineral impurities.

[0013] Further, the first sorted material is subjected to a composition analysis. If the Fe 3+ If the content of is less than or equal to the first preset value and greater than the second preset value, the first magnetic particles are added to obtain a second magnetically separated product;

[0014] performing a third strong magnetic separation on the second magnetized separated product to obtain iron-based weakly magnetic mineral impurities and a third separated product;

[0015] adding second magnetic particles to the third fraction to obtain a third magnetized fraction;

[0016] The third magnetized separated product is subjected to a fourth strong magnetic separation to obtain magnetic titanium concentrate, non-magnetic minerals and other non-magnetic impurities.

[0017] Further, the first sorted material is subjected to a composition analysis. If the Fe 3+ If the content of is less than or equal to the second preset value, the second magnetic particles are added to obtain a fourth magnetically separated product;

[0018] performing a fifth strong magnetic separation on the fourth magnetized separated product to obtain magnetic titanium concentrate and a fourth separated product;

[0019] adding the first magnetic particles to the fourth separated product to obtain a fifth magnetized separated product;

[0020] The fifth magnetic separation product is subjected to a sixth strong magnetic separation to obtain iron-based weakly magnetic mineral impurities, non-magnetic minerals and other non-magnetic impurities.

[0021] Furthermore, in the weak magnetic separation, the magnetic flux is 0.1 to 0.3T.

[0022] Furthermore, in the first strong magnetic separation, the magnetic flux used is 0.5 to 2T.

[0023] Furthermore, in the second strong magnetic separation, the magnetic flux used is 0.8-1.5T.

[0024] Furthermore, in the third strong magnetic separation, the magnetic flux used is 0.5-1.2T, and in the fourth strong magnetic separation, the magnetic flux used is 0.8-1.5T.

[0025] Furthermore, in the fifth strong magnetic separation, the magnetic flux used is 0.8 to 1.5 T; in the sixth strong magnetic separation, the magnetic flux used is 0.8 to 1.5 T.

[0026] Furthermore, the first magnetic particles are manganese-zinc ferrite nanoparticles or manganese ferrite nanoparticles, wherein the manganese content is not less than 25 wt %.

[0027] Furthermore, the second magnetic particles are iron oxide nanoparticles.

[0028] In summary, the present invention has the following beneficial effects:

[0029] (1) The present invention introduces multiple magnetic separation steps, including weak magnetic separation, strong magnetic separation, and multiple magnetic separations, to more finely separate magnetic titanium concentrate, iron-based weakly magnetic mineral impurities, non-magnetic minerals, and other non-magnetic impurities. This multi-stage separation process can significantly improve the purity of titanium concentrate.

[0030] (2) The present invention is based on the Fe 3+ The use of content-adjusting magnetic particles can specifically process minerals with different impurity contents, further improving the accuracy and effect of sorting.

[0031] (3) The present invention detects Fe in the first sorted product. 3+ Whether to add magnetic particles and perform subsequent magnetic separation steps is determined by the content, so that the method can be flexibly adapted to mineral raw materials with different compositions, thereby improving the applicability of the process.

[0032] (4) The present invention uses different types of magnetic particles (such as manganese zinc ferrite nanoparticles and iron oxide nanoparticles) for surface modification, combines the characteristics of different magnetic particles, enhances the magnetic modification effect on specific minerals, and further improves the sorting efficiency.

[0033] (5) The present invention introduces first magnetic particles and second magnetic particles to perform surface modification on the magnetic titanium concentrate and impurity minerals, thereby enhancing their magnetic differences, so that in subsequent strong magnetic separation, the magnetic titanium concentrate can be more effectively separated from the iron-based weakly magnetic mineral impurities.

[0034] (6) The present invention can process mineral impurities of different properties separately through strong magnetic separation steps with different magnetic fluxes, optimize the separation process, reduce the loss of magnetic titanium concentrate, and improve the quality of the final product. DETAILED DESCRIPTION

[0035] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, a high-efficiency titanium concentrate magnetic separation method proposed in the present invention, its specific implementation method, characteristics and effects are described in detail as follows.

[0036] Titanium concentrate usually includes magnetic titanium concentrate, non-magnetic titanium concentrate, iron-containing mineral impurities, non-magnetic minerals and other non-magnetic impurities; among them, the iron-containing mineral impurities contain not only strongly magnetic impurities such as hematite and magnetite, but also some weakly magnetic impurities such as pseudo-hematite.

[0037] In the existing technology, strongly magnetic impurities are usually separated from titanium concentrate by magnetic separation. However, magnetic titanium concentrate and some weakly magnetic impurities such as pseudo-hematite have very similar magnetic properties, particle size and density, so they cannot be distinguished by physical methods.

[0038] In response to the above problems, this specific embodiment provides the following solutions to achieve the purpose of directly distinguishing them by physical methods, thereby improving the yield and accuracy of titanium concentrate.

[0039] This specific embodiment provides a high-efficiency magnetic separation method for titanium concentrate, wherein the titanium concentrate includes at least one of magnetic titanium concentrate, iron-containing mineral impurities, non-magnetic minerals and other non-magnetic impurities;

[0040] Methods include:

[0041] Conducting weak magnetic separation on the titanium concentrate to obtain the first separation product and strongly magnetic iron-containing mineral impurities;

[0042] The first sorted material is subjected to composition analysis. If the Fe 3+ The content of is greater than a first preset value, adding first magnetic particles and second magnetic particles to obtain a first magnetic separation product;

[0043] Performing a first strong magnetic separation on the first magnetized separated product to obtain a second separated product, non-magnetic minerals and other non-magnetic impurities;

[0044] The second separated product is subjected to acidification treatment and second strong magnetic separation to obtain magnetic titanium concentrate and iron-based weakly magnetic mineral impurities;

[0045] The non-magnetic minerals and other non-magnetic impurities are separated into solid and liquid to obtain non-magnetic titanium concentrate.

[0046] It can be understood that the main component of Martite is iron oxide (α-Fe O), which is the same as the composition of hematite. Martite is a variant of hematite, usually formed by oxidation of magnetite (Fe O); Martite has the same hexagonal crystal structure as hematite. This structure is very stable and highly symmetrical. Martite is usually formed by oxidation of magnetite. This transformation usually occurs in an oxygen-rich environment. The Fe in magnetite is 2+ ions are oxidized to Fe 3+ , thus forming a pseudo hematite with a hematite structure, which retains the appearance of magnetite, but its internal crystal structure has been transformed into the structure of hematite. This transformation process usually does not change the morphology of the mineral, so it is called "pseudo"; in actual mining, the magnetism of pseudo hematite is very close to that of magnetic titanium concentrate, and it will be coated with some other metals during the formation process, resulting in more complex magnetism, making it difficult to distinguish between pseudo hematite and magnetic titanium concentrate by magnetic separation.

[0047] False hematite usually contains a certain amount of Fe 3+ , while the Fe in magnetic titanium concentrate is Fe 2+ After weak magnetic separation, strong magnetic impurities such as magnetite and hematite are removed, and the remaining first separation products include Fe 3+ Most of them come from pseudo-hematite. At this time, the Fe 3+ By measuring, the content of pseudo-hematite can be estimated.

[0048] When Fe 3+ When the content is greater than the first threshold, it indicates that the content of pseudo-hematite in the first separation is high. If magnetic separation is directly used at this time, it is impossible to separate it from the magnetic titanium concentrate, and it is also impossible to accurately separate the weakly magnetic magnetic titanium concentrate from the non-magnetic minerals.

[0049] In this specific embodiment, first magnetic particles and second magnetic particles are added, and the surface of the magnetic titanium concentrate and the pseudo-hematite is modified by the first magnetic particles and the second magnetic particles to improve the magnetism of the magnetic titanium concentrate and the pseudo-hematite. The magnetic titanium concentrate and the pseudo-hematite can be accurately separated from the non-magnetic minerals and non-magnetic impurities by the first strong magnetic separation to obtain a mixture of the magnetic titanium concentrate and the pseudo-hematite, i.e., the second separation product; wherein, the amount of the first magnetic particles added is 1.5 to 2 times the first preset value, and the amount of the second magnetic particles added is 3 to 5 times the amount of the first magnetic particles added.

[0050] It should be noted that, in this specific embodiment, the first magnetic particles and Fe 3+ The binding ability is strong, and the2+ The binding ability of the first magnetic particles is weak, which makes the first magnetic particles preferentially bind to the pseudo-hematite under the same conditions; while the second magnetic particles have poor acid resistance; therefore, when the second separation is acid-washed, the second magnetic particles are dissolved. At the same time, the magnetic titanium concentrate is weakly bound to the first magnetic particles and will be damaged and fall off under acidic conditions. The pseudo-hematite, on the other hand, is tightly bound to the first magnetic particles and is not damaged by the acid. This makes the pseudo-hematite more magnetic than the magnetic titanium concentrate. At this time, the second strong magnetic separation can accurately separate the magnetic titanium concentrate and the pseudo-hematite. At the same time, the non-magnetic titanium concentrate separated from the pseudo-hematite can also be recovered by other means, such as solid-liquid separation, greatly improving the yield and purity of the titanium concentrate.

[0051] In this embodiment, the first sorted material is subjected to component analysis. If Fe 3+ If the content of is less than or equal to the first preset value and greater than the second preset value, the first magnetic particles are added to obtain a second magnetically separated product;

[0052] performing a third strong magnetic separation on the second magnetized separated product to obtain iron-based weakly magnetic mineral impurities and a third separated product;

[0053] adding second magnetic particles to the third sorted product to obtain a third magnetized sorted product;

[0054] The third magnetized separated product is subjected to a fourth strong magnetic separation to obtain magnetic titanium concentrate, non-magnetic minerals and other non-magnetic impurities.

[0055] It is understandable that when the Fe 3+ The content is less than or equal to the first preset value and greater than the second preset value, which indicates that the first sorted material contains a certain amount of iron-based weakly magnetic mineral impurities, such as pseudo-hematite, but the content is not high. If the first magnetic particles are added, they will preferentially combine with the iron-based weakly magnetic mineral impurities to improve the magnetism of the pseudo-hematite-type iron-based weakly magnetic mineral impurities, while the first magnetic particles have a weak binding force with the magnetic titanium concentrate and cannot significantly improve the magnetism of the magnetic titanium concentrate. Furthermore, the iron-based weakly magnetic mineral impurities can be extracted through strong magnetic separation to obtain the third sorted material.

[0056] At this time, the second magnetic particles are added to the third sorted material. The second magnetic particles greatly improve the magnetism of the magnetic titanium concentrate, making it different from other non-magnetic substances. The magnetic titanium concentrate can be extracted by strong magnetic separation. The remaining non-magnetic substances contain rutile, anatase, silica and other substances, which can be distinguished by traditional solid-liquid separation methods, thereby obtaining high-yield, high-purity titanium concentrate. Among them, the amount of the first magnetic particles added is greater than or equal to the first preset value, and the amount of the second magnetic particles added is 4 to 6 times the amount of the first magnetic particles added.

[0057] In this embodiment, the first sorted material is subjected to component analysis. If Fe 3+ If the content of is less than or equal to the second preset value, the second magnetic particles are added to obtain a fourth magnetically separated product;

[0058] performing a fifth strong magnetic separation on the fourth magnetized separated product to obtain magnetic titanium concentrate and a fourth separated product;

[0059] adding the first magnetic particles to the fourth separated product to obtain a fifth magnetized separated product;

[0060] The fifth magnetic separation product is subjected to a sixth strong magnetic separation to obtain iron-based weakly magnetic mineral impurities, non-magnetic minerals and other non-magnetic impurities.

[0061] It is understandable that when the Fe 3+ If the content is less than or equal to the second preset value, it means that the content of iron-based weak magnetic mineral impurities whose magnetism is close to that of magnetic titanium concentrate in the first selected material is small. At this time, directly adding the second magnetic particles can greatly improve the magnetism of the magnetic titanium concentrate, and a small amount of iron-based weak magnetic mineral impurities can be distinguished by strong magnetic separation with more accurate magnetic flux because their magnetism is weaker than that of magnetic titanium concentrate; at this time, the first magnetized particles are added to the fourth selected material to obtain the fifth magnetized selected material; the fifth magnetized selected material is subjected to the sixth strong magnetic separation to obtain iron-based weak magnetic mineral impurities such as pseudo-hematite and other impurities, non-magnetic minerals and other non-magnetic impurities; the remaining non-magnetic minerals and other non-magnetic impurities can also be obtained by solid-liquid separation to obtain non-magnetic titanium concentrate such as rutile and anatase in the remaining solid; wherein, the amount of the first magnetic particles added is 1.2 to 1.5 times the second preset value; the amount of the second magnetic particles added is less than or equal to the mass of the first selected material.

[0062] In some preferred embodiments, during weak magnetic separation, the magnetic flux is 0.1 to 0.3 T. In the weak magnetic field, only strongly magnetic impurities such as magnetite and hematite are separated, while weakly magnetic magnetic titanium concentrate is not separated. Selecting the above magnetic field can effectively separate strongly magnetic mineral impurities, improve the purity of the titanium concentrate, avoid carrying out the magnetic titanium concentrate, and improve the yield of the titanium concentrate.

[0063] In some preferred embodiments, the magnetic flux used in the first strong magnetic separation is 0.5 to 2 T. In the strong magnetic field, the magnetized magnetic titanium concentrate and weakly magnetic iron-based mineral impurities such as pseudo-hematite can be separated to the greatest extent, thereby ensuring the purity and yield of the non-magnetic titanium concentrate.

[0064] In some preferred embodiments, the second strong magnetic separation uses a magnetic flux of 0.8 to 1.5 T. This magnetic field strength ensures that the pseudo-hematite that still retains a relatively strong magnetism is separated out, while preventing the magnetic titanium concentrate that has lost its magnetization effect from remaining in the separation product, thereby significantly improving the purity and yield of the magnetic titanium concentrate.

[0065] In some preferred embodiments, the magnetic flux used in the third strong magnetic separation is 0.5 to 1.2 T, and the magnetic flux used in the fourth strong magnetic separation is 0.8 to 1.5 T. Under the magnetic flux selected for the third strong magnetic separation in this specific embodiment, it is possible to separate out the pseudo-hematite that still retains a relatively strong magnetism, while retaining the magnetic titanium concentrate with a weaker magnetization effect in the separation product, thereby significantly improving the purity and yield of the magnetic titanium concentrate. Under the magnetic flux selected for the fourth strong magnetic separation in this specific embodiment, it is possible to ensure that the magnetic titanium concentrate, which has been magnetized again, is better separated from other non-magnetic substances.

[0066] In some preferred embodiments, the fifth high-intensity magnetic separation uses a magnetic flux of 0.8 to 1.5 T, and the sixth high-intensity magnetic separation uses a magnetic flux of 0.8 to 1.5 T. In the high-intensity magnetic separation step, a magnetic flux of 0.8 to 1.5 T is used for the final ilmenite purification process to ensure maximum separation of high-purity ilmenite or maximum separation of weakly magnetic iron-based mineral impurities. This magnetic flux range is strong enough to attract residual ilmenite or the weakest magnetic iron-based mineral impurities.

[0067] In some preferred embodiments, the first magnetic particles are manganese zinc ferrite nanoparticles or manganese ferrite nanoparticles, wherein the manganese content is not less than 25 wt %.

[0068] It is understood that the surface chemistry of ilmenite is determined by the iron (Fe 2+ ) and titanium (Ti 4+ ) oxide. The iron oxide portion can form chemical bonds with the iron oxide in the manganese iron zinc magnetic particles, for example, through a Fe-O-Fe or Fe-O-Mn bridge structure. The titanium oxide portion (TiO) can also form chemical bonds with the manganese iron zinc magnetic particles under certain conditions, but this bond is weaker than that of the iron oxide portion; while the surface of the pseudo-hematite is almost entirely composed of Fe 3+ Oxide (α-FeO) composition, Fe 3+The surface activity is high and it is easy to react with other oxides (such as Mn in manganese iron zinc magnetic particles) 2+ 、Fe 2+ / Fe 3+ ) are bonded by chemical bonds. Fe 3+ With Mn 2+ Strong bonds (such as Fe-O-Mn bonds) may be formed between them, so the binding force with manganese iron zinc magnetic particles is stronger. That is to say, when manganese zinc ferrite nanoparticles or manganese ferrite nanoparticles are used to modify the surface of ilmenite and pseudo hematite, the binding force between pseudo hematite and manganese zinc ferrite nanoparticles or manganese ferrite nanoparticles is stronger. This is because the surface of pseudo hematite is mainly composed of Fe 3+ Oxide composition, can be combined with Mn in manganese iron zinc magnetic particles 2+ 、Fe 2+ / Fe 3+ The TiO2 in ilmenite has a weaker binding force with the manganese-iron-zinc magnetic particles, making the overall binding force weaker than that of the pseudo-hematite. Therefore, during surface modification, the manganese-zinc ferrite nanoparticles or manganese-ferrite nanoparticles will preferentially bind to the pseudo-hematite. The higher the manganese content, the more obvious the difference in binding force.

[0069] In some preferred embodiments, the second magnetic particles are iron oxide nanoparticles. FeO nanoparticles have high solubility in acidic environments, especially in acidic solutions such as dilute hydrochloric acid and dilute sulfuric acid, where FeO is dissolved into soluble iron salts (such as FeCl and FeSO). Manganese zinc ferrite nanoparticles or manganese ferrite nanoparticles are relatively stable in acidic solutions such as dilute hydrochloric acid and dilute sulfuric acid and are not easily eluted. Applying this difference in the present embodiment can, under acidic conditions, cause the magnetic titanium concentrate that easily binds to the iron oxide nanoparticles to lose its magnetizing effect, while retaining the magnetizing effect of iron-based weakly magnetic mineral impurities such as pseudo-hematite that easily bind to the manganese zinc ferrite nanoparticles or manganese ferrite nanoparticles. This can further increase the difference in magnetic strength between the magnetic titanium concentrate and the pseudo-hematite, facilitating magnetic separation of the two.

[0070] It should be noted that, in this specific embodiment, the first preset value and the second preset value are based on the Fe 3+ The content of Fe in the mineral composition is determined by assuming the difference in magnetic susceptibility between hematite and magnetic ilmenite concentrate. In this embodiment, the first preset value is preferably 10% and the second preset value is 3%. 3+ Different contents indicate that their magnetic susceptibility and physical and chemical properties may be significantly different. By setting the preset value, the mineral with high content (Fe 3+Content exceeding 10% (10%) enters a more complex processing path, including multiple magnetic separations and chemical treatments to ensure the complete removal of impurities. This graded treatment ensures that minerals with different characteristics are processed according to their specific needs, avoiding a "one-size-fits-all" approach and improving processing precision and effectiveness. This refined classification minimizes the mixing of ilmenite with impurity minerals and improves the purity of the final product.

[0071] Example 1

[0072] In this embodiment, 400 kg of Panzhihua titanium concentrate is subjected to magnetic separation, and the method is as follows:

[0073] S1. Perform weak magnetic separation on the titanium concentrate with a magnetic flux of 0.2T to obtain 352kg of first separation material and strongly magnetic iron-containing mineral impurities;

[0074] S2. Analyze the composition of the first sorted material. 3+ The content of 12 wt.% is greater than the first preset value of 10 wt.%, and 35.2 kg of manganese iron zinc magnetic particles and 176 kg of iron oxide nanoparticles are added to obtain a first magnetized separation;

[0075] S3, performing a first strong magnetic separation on the first magnetized separation, with a magnetic flux of 1.2 T, to obtain a second separation, non-magnetic minerals and other non-magnetic impurities;

[0076] S4. Acidification treatment is performed on the second separation product, and a second strong magnetic separation is performed with a magnetic flux of 1.0 T to obtain 201.5 kg of magnetic titanium concentrate and iron-based weakly magnetic mineral impurities;

[0077] S5. Perform solid-liquid separation on the non-magnetic minerals and other non-magnetic impurities to obtain 97.8 kg of non-magnetic titanium concentrate.

[0078] Example 2

[0079] In this embodiment, 400 kg of Panzhihua titanium concentrate is subjected to magnetic separation, and the method is as follows:

[0080] S1. Perform weak magnetic separation on the titanium concentrate with a magnetic flux of 0.2T to obtain 348kg of first separation material and strongly magnetic iron-containing mineral impurities;

[0081] S2. Analyze the composition of the first sorted material. 3+ The content of 6 wt.% is less than the first preset value of 10 wt.%, and greater than the second preset value of 3 wt.%, and 12.5 kg of manganese iron zinc magnetic particles are added to obtain a second magnetized separation;

[0082] S3, performing a third strong magnetic separation on the second magnetized separated product, with a magnetic flux of 0.9 T, to obtain iron-based weakly magnetic mineral impurities and a third separated product;

[0083] S4, adding 238 kg of iron oxide nanoparticles to the third fraction to obtain a third magnetically separated product;

[0084] S5. The second magnetized separated product is subjected to a fourth strong magnetic separation with a magnetic flux of 0.5 T to obtain 306.8 kg of magnetic titanium concentrate, non-magnetic minerals and other non-magnetic impurities;

[0085] S6. Perform solid-liquid separation on the non-magnetic minerals and other non-magnetic impurities to obtain 88.2 kg of non-magnetic titanium concentrate.

[0086] Example 3

[0087] In this embodiment, 400 kg of Panzhihua titanium concentrate is subjected to magnetic separation, and the method is as follows:

[0088] S1. Perform weak magnetic separation on the titanium concentrate with a magnetic flux of 0.2T to obtain 365kg of first separation material and strongly magnetic iron-containing mineral impurities;

[0089] S2. Analyze the composition of the first sorted material. 3+ The content of is 2 wt.%, which is less than the second preset value, and 301 kg of iron oxide nanoparticles are added to obtain a fourth magnetically separated product;

[0090] S3, the fourth magnetized separated product is subjected to the fifth strong magnetic separation with a magnetic flux of 0.9 T to obtain 295 kg of magnetic titanium concentrate and the fourth separated product;

[0091] S4, adding 10.8 kg of manganese iron zinc magnetic particles to the fourth separated product to obtain a fifth magnetized separated product;

[0092] S5, performing a sixth strong magnetic separation on the fifth magnetically separated product to obtain iron-based weakly magnetic mineral impurities, non-magnetic minerals and other non-magnetic impurities;

[0093] S6. Perform solid-liquid separation on the non-magnetic minerals and other non-magnetic impurities to obtain 103.2 kg of non-magnetic titanium concentrate.

[0094] Comparative Example 1

[0095] In this embodiment, 400 kg of Panzhihua titanium concentrate of the same batch as in Example 1 was subjected to magnetic separation, and the method was as follows:

[0096] S1. Perform weak magnetic separation on the titanium concentrate with a magnetic flux of 0.2T to obtain 352kg of first separation material and strongly magnetic iron-containing mineral impurities;

[0097] S2, adding 211.2 kg of manganese iron zinc magnetic particles to the first separated material to obtain a first magnetized separated material;

[0098] S3. Performing a first strong magnetic separation on the first magnetized separated product with a magnetic flux of 1.2 T to obtain 225.5 kg of magnetic titanium concentrate, non-magnetic minerals and other non-magnetic impurities;

[0099] S4. Perform solid-liquid separation on the non-magnetic minerals and other non-magnetic impurities to obtain 97.8 kg of non-magnetic titanium concentrate.

[0100] Comparative Example 2

[0101] In this embodiment, 400 kg of Panzhihua titanium concentrate of the same batch as in Example 2 was subjected to magnetic separation, and the method was as follows:

[0102] S1. Perform weak magnetic separation on the titanium concentrate with a magnetic flux of 0.2T to obtain 348kg of first separation material and strongly magnetic iron-containing mineral impurities;

[0103] S2, adding 260.5 kg of iron oxide nanoparticles to the first separated material to obtain a first magnetized separated material;

[0104] S3. Performing a first strong magnetic separation on the first magnetized separated product with a magnetic flux of 1.2 T to obtain 225.5 kg of magnetic titanium concentrate, non-magnetic minerals and other non-magnetic impurities;

[0105] S4. Perform solid-liquid separation on the non-magnetic minerals and other non-magnetic impurities to obtain 97.8 kg of non-magnetic titanium concentrate.

[0106] Comparative Example 3

[0107] In this embodiment, 400 kg of Panzhihua titanium concentrate of the same batch as in Example 3 was subjected to magnetic separation, and the method was as follows:

[0108] S1. Perform weak magnetic separation on the titanium concentrate with a magnetic flux of 0.2T to obtain 365kg of first separation material and strongly magnetic iron-containing mineral impurities;

[0109] S2. Add 311.8 kg of iron oxide nanoparticles to the first separated product to obtain a fourth magnetized separated product;

[0110] S3. The fourth magnetized separation product is subjected to a fifth strong magnetic separation with a magnetic flux of 0.9 T to obtain 295 kg of magnetic titanium concentrate, non-magnetic minerals and other non-magnetic impurities;

[0111] S4. Perform solid-liquid separation on the non-magnetic minerals and other non-magnetic impurities to obtain 103.2 kg of non-magnetic titanium concentrate.

[0112] Performance Testing

[0113] The components of the impurities in the titanium concentrates obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were determined, and the results are shown in Table 1.

[0114] Table 1. Composition determination results

[0115]

[0116] According to the above test results, the technical solution provided by the present invention can accurately distinguish the pseudo-hematite with similar magnetic properties to ilmenite, thereby greatly improving the purity of the titanium concentrate.

[0117] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been presented as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency magnetic separation method for titanium concentrate, characterized in that: The titanium concentrate includes at least one of magnetic titanium concentrate, iron-containing mineral impurities, non-magnetic minerals and other non-magnetic impurities; The method comprises: Conducting weak magnetic separation on the titanium concentrate to obtain the first separation product and strongly magnetic iron-containing mineral impurities; The first sorted material is subjected to component analysis. If Fe 3+ The content of is greater than a first preset value, adding first magnetic particles and second magnetic particles to obtain a first magnetic separation product; Performing a first strong magnetic separation on the first magnetized separated product to obtain a second separated product, non-magnetic minerals and other non-magnetic impurities; The second separated product is subjected to acidification treatment and second strong magnetic separation to obtain magnetic titanium concentrate and iron-based weakly magnetic mineral impurities; The non-magnetic minerals and other non-magnetic impurities are separated into solid and liquid to obtain non-magnetic titanium concentrate.

2. A high-efficiency magnetic separation method for titanium concentrate according to claim 1, characterized in that: The first sorted material is subjected to component analysis. If Fe 3+ If the content of is less than or equal to the first preset value and greater than the second preset value, the first magnetic particles are added to obtain a second magnetically separated product; performing a third strong magnetic separation on the second magnetized separated product to obtain iron-based weakly magnetic mineral impurities and a third separated product; adding second magnetic particles to the third sorted product to obtain a third magnetized sorted product; The third magnetized separated product is subjected to a fourth strong magnetic separation to obtain magnetic titanium concentrate, non-magnetic minerals and other non-magnetic impurities.

3. A high-efficiency magnetic separation method for titanium concentrate according to claim 1, characterized in that: The first sorted material is subjected to component analysis. If Fe 3+ If the content of is less than or equal to the second preset value, the second magnetic particles are added to obtain a fourth magnetically separated product; performing a fifth strong magnetic separation on the fourth magnetized separated product to obtain magnetic titanium concentrate and a fourth separated product; adding the first magnetic particles to the fourth separated product to obtain a fifth magnetized separated product; The fifth magnetic separation product is subjected to a sixth strong magnetic separation to obtain iron-based weakly magnetic mineral impurities, non-magnetic minerals and other non-magnetic impurities.

4. A high-efficiency magnetic separation method for titanium concentrate according to claim 1, characterized in that: In the weak magnetic separation, the magnetic flux is 0.1-0.3T.

5. A high-efficiency magnetic separation method for titanium concentrate according to claim 1, characterized in that: In the first strong magnetic separation, the magnetic flux used is 0.5-2T.

6. A high-efficiency magnetic separation method for titanium concentrate according to claim 1, characterized in that: In the second strong magnetic separation, the magnetic flux used is 0.8-1.5T.

7. A high-efficiency magnetic separation method for titanium concentrate according to claim 2, characterized in that: In the third strong magnetic separation, the magnetic flux used is 0.5-1.2T, and in the fourth strong magnetic separation, the magnetic flux used is 0.8-1.5T.

8. A high-efficiency magnetic separation method for titanium concentrate according to claim 3, characterized in that: In the fifth strong magnetic separation, the magnetic flux used is 0.8-1.5T; in the sixth strong magnetic separation, the magnetic flux used is 0.8-1.5T.

9. A high-efficiency magnetic separation method for titanium concentrate according to claim 1, characterized in that: The first magnetic particles are manganese-zinc ferrite nanoparticles or manganese ferrite nanoparticles, wherein the content of manganese is not less than 25 wt %.

10. A high-efficiency magnetic separation method for titanium concentrate according to claim 1, characterized in that: The second magnetic particles are iron oxide nanoparticles.

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