Method for extracting titanium and reducing impurities from iron separation tailings containing ilmenite
Through the steps of strong magnetic tailing throwing, reselection pre-enrichment, sulfur removal flotation and dry magnetic separation, the problems of high production costs and secondary pollution in the existing technology are solved, and high-grade titanium concentrate is achieved. The separation and recycling of the company has improved resource utilization.
Patent Information
- Application Number
- CN202411521370.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-01-03
AI Technical Summary
The prior art When separating and producing high-quality titanium concentrate from iron-coated tailings containing ilmenite, the production cost is high and it is easy to cause secondary pollution, especially due to the pollution problems caused by chemical agents used for flotation. .
Using strong magnetic tailings, reselection pre-enrichment, sulfur desulfurization flotation, reselection and quality improvement and dry magnetic separation, etc., to avoid pyrite titanium by placing sulfur desulfurization flotation before reselection and quality improvement. The influence of minerals and the use of dry magnetic separation replaces flotation and titanium selection process to reduce production costs and secondary pollution.
It has achieved the improvement of the grade and recycling effect of titanium concentrate under the conditions of reducing production costs and secondary pollution, and produced titanium concentrate with TiO2 grade of more than 46%, sulfur concentrate with S grade of more than 43%, and TFe grade It is more than 60% iron concentrate, which solves the difficulty of high-calcium ilmenite to produce qualified titanium concentrate and improves resource utilization.
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Figure CN119237143A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of mineral recovery, for example, to a method for extracting titanium and reducing impurities from iron ore tailings containing ilmenite. Background Art
[0002] Titanium is a light luxury metal. Due to its light weight, high strength, corrosion resistance, oxidation resistance, and good biocompatibility, it is widely used in aerospace, medical, automotive, chemical, food processing, shipbuilding, cosmetics, sports equipment and other fields, especially in fields that require strength and corrosion resistance.
[0003] There are more than 80 minerals in the earth's crust that contain more than 1% titanium, 15 of which have industrial value. The main ones used in China include ilmenite, rutile, and titanomagnetite. In recent years, as high-quality and easy-to-select titanium resources have been exhausted, low-grade, complex, and difficult-to-process titanium ore resources have become the main raw material for China's titanium industry.
[0004] In this regard, Chinese patent document CN201910246325.0 discloses a titanium magnetite ilmenite beneficiation process, specifically discloses a method for recovering titanium concentrate from iron tailings, including strong magnetic separation, shaking table gravity separation, desulfurization flotation and titanium flotation, etc. The method can obtain titanium concentrate with a TiO2 content of 44.0%, a S content of 0.14% and a TiO2 recovery rate of 32.0%. However, the method disclosed in the above patent document adopts a process flow combining desulfurization flotation and titanium flotation, which is not only prone to secondary pollution caused by the chemical agents used in flotation, but also has the problem of high production costs.
[0005] In summary, there is an urgent need for a method that can separate and produce high-quality titanium concentrate from iron ore tailings containing ilmenite minerals, so that it can achieve the effect of titanium extraction and impurity reduction under the conditions of reducing production costs and secondary pollution caused by chemical agents used in flotation. Summary of the invention
[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for extracting titanium and reducing impurities in iron-separated tailings containing ilmenite, so as to at least achieve the effect of separating and producing high-quality titanium concentrate from iron-separated tailings containing ilmenite while reducing production costs and secondary pollution caused by chemical agents used for flotation.
[0007] The purpose of this disclosure is achieved through the following technical solutions:
[0008] On the one hand, a method for extracting titanium and reducing impurities in iron-separated tailings containing ilmenite is provided. The method comprises: performing strong magnetic tailings discarding on the iron-separated tailings to obtain strong magnetic concentrate and strong magnetic tailings; performing gravity pre-enrichment on the strong magnetic concentrate to obtain gravity pre-enrichment concentrate and a first tailings; performing desulfurization flotation on the gravity pre-enrichment concentrate to obtain a sulfur concentrate and desulfurization flotation tailings; performing gravity upgrading on the desulfurization flotation tailings to obtain gravity upgraded concentrate, gravity upgraded middlings and a second tailings; and performing dry magnetic separation on the gravity upgraded concentrate to obtain a secondary iron concentrate, a titanium concentrate and a third tailings.
[0009] In some examples, the gravity-concentration upgrading middlings are returned to the gravity-concentration upgrading.
[0010] In some examples, the equipment used for the gravity separation and upgrading includes at least one of a spiral chute, a sludge shaking table, and a sand shaking table.
[0011] In some embodiments, the gravity-separation pre-enrichment of the strong magnetic concentrate to obtain a gravity-separation pre-enriched concentrate and a first tailings includes: performing gravity-separation pre-enrichment roughing separation on the strong magnetic concentrate to obtain a gravity-separation pre-enriched rougher concentrate, a gravity-separation pre-enriched rougher mide and a gravity-separation pre-enriched rougher tailings; and performing gravity-separation pre-enrichment scavenging separation on the gravity-separation pre-enriched rougher mide to obtain a gravity-separation pre-enriched scavenging concentrate and a gravity-separation pre-enriched scavenging tailings; wherein the gravity-separation pre-enriched rougher concentrate and the gravity-separation pre-enriched scavenging concentrate are combined into the gravity-separation pre-enriched concentrate; and the gravity-separation pre-enriched rougher tailings, the gravity-separation pre-enriched scavenging tailings and the strong magnetic tailings are combined into the first tailings.
[0012] In some examples, the equipment used for the gravity concentration pre-enrichment includes at least one of a spiral chute, a sludge shaking table, and a sand shaking table.
[0013] In some embodiments, the desulfurization flotation of the gravity-separation pre-enriched concentrate to obtain a sulfur concentrate and a desulfurization flotation tailings includes: performing desulfurization roughing selection on the gravity-separation pre-enriched concentrate to obtain a desulfurization roughing concentrate and a desulfurization roughing tailings; performing desulfurization scavenging selection on the desulfurization roughing tailings to obtain a desulfurization scavenging concentrate and the desulfurization flotation tailings; and performing desulfurization concentration selection on the desulfurization roughing concentrate to obtain the sulfur concentrate and the desulfurization concentration tailings.
[0014] In some examples, the desulfurization scavenging concentrate is combined with the desulfurization beneficiation tailings and returned to the desulfurization rougher.
[0015] In some embodiments, the reagents used in the desulfurization flotation include a medium activator, a collector and a frother; wherein the medium activator includes one of sulfuric acid and copper sulfate; the collector includes at least one of butyl xanthate, isopentyl xanthate and black medicine; the frother includes 2 # Oil.
[0016] In some examples, the sulfur removal roughing uses the media activator, the collector, and the frother.
[0017] For example, in the desulfurization roughing, the dosage of the medium activator is 300-1500 g / t·feed ore, the dosage of the collector is 100-300 g / t·feed ore, and the dosage of the frother is 20-50 g / t·feed ore.
[0018] In some examples, the desulfurization sweep employs the collector and the frother.
[0019] For example, in the desulfurization sweep, the amount of the collector is 50-150 g / t·feed ore, and the amount of the foaming agent is 10-30 g / t·feed ore.
[0020] In some embodiments, the dry magnetic separation of the gravity-separated upgraded concentrate to obtain a sub-iron concentrate, a titanium concentrate and a third tailings includes: performing dry magnetic roughing separation on the gravity-separated upgraded concentrate to obtain a dry magnetic roughing concentrate, a dry magnetic roughing ore, a dry magnetic roughing tailings and the sub-iron concentrate; and performing dry magnetic scavenging separation on the dry magnetic roughing ore to obtain a dry magnetic scavenging concentrate and a dry magnetic scavenging tailings; wherein the dry magnetic roughing concentrate and the dry magnetic scavenging concentrate are combined into the titanium concentrate; and the dry magnetic roughing tailings and the dry magnetic scavenging tailings are combined into the third tailings.
[0021] In some embodiments, the equipment used for dry magnetic separation includes a titanium dry separator, which includes an iron roller and a titanium roller; wherein the magnetic field strength of the iron roller is 1000-1200 Gs; and the magnetic field strength of the titanium roller is 8600-9100 Gs.
[0022] In some embodiments, the magnetic field strength of the strong magnetic tail is 0.7-0.9T.
[0023] In some examples, the equipment used for the strong magnetic tailings discarding includes at least one of a flat ring strong magnetic separator, a vertical ring strong magnetic separator, a flat ring high gradient strong magnetic separator and a vertical ring high gradient strong magnetic separator.
[0024] In some embodiments, the method further comprises: grinding the secondary iron concentrate to obtain dissociated ore; and performing weak magnetic iron separation on the dissociated ore to obtain iron concentrate and iron middlings.
[0025] In some embodiments, the mass percentage of minerals with a particle size of -0.075 mm in the dissociated minerals is 80% to 95%.
[0026] It should be noted that “the mass percentage of minerals with a particle size of -0.075 mm in the dissociated minerals is 80% to 95%” can also be understood as “the grinding fineness of the grinding is -0.075 mm 80% to 95%”, and both have the same meaning.
[0027] In some embodiments, the magnetic field strength of the weak magnetic iron separation is 0.1-0.2T.
[0028] In some examples, the mass percent concentration of the slurry for weak magnetic iron separation is 25% to 50%.
[0029] In some examples, the equipment used for the weak magnetic iron separation includes a wet weak magnetic separator.
[0030] Exemplarily, the wet weak magnetic separator includes at least one of a wet permanent magnet weak magnetic separator and a wet electromagnetic weak magnetic separator.
[0031] It should be noted that the working principle of the method provided in the present disclosure includes: first, a large amount of gangue minerals can be discarded through the strong magnetic tailings discarding, thereby reducing the production cost of subsequent processes; secondly, the gravity separation pre-enriched concentrate can be obtained through the gravity separation pre-enrichment; then, by placing the desulfurization flotation before the gravity separation and upgrading, the influence of sulfide minerals such as pyrite on the recovery of titanium minerals in the subsequent gravity separation and upgrading can be eliminated; then, high-quality titanium concentrate can be produced through the dry magnetic separation; on this basis, the sub-iron concentrate produced by the dry magnetic separation can also be subjected to the grinding and weak magnetic iron separation to produce qualified iron concentrate.
[0032] It is worth noting that the method provided in the present disclosure can avoid the large amount of pyrite in the iron-separation tailings from affecting the zoning and separation of titanium minerals in the subsequent gravity separation and upgrading by placing the desulfurization flotation before the gravity separation and upgrading, thereby greatly improving the separation effect and facilitating the output of the titanium concentrate; in addition, the method provided in the present disclosure avoids the process of combining flotation desulfurization with flotation titanium selection, and adopts the gravity separation and the dry magnetic separation to replace the conventional flotation titanium selection, which can not only greatly reduce the production cost and the secondary pollution caused by the chemical agents used in flotation, but also improve the grade of the titanium concentrate and the recovery effect of titanium resources, thereby ensuring the output of high-quality titanium concentrate.
[0033] In some embodiments, the ilmenite-containing mineral comprises high titanite ilmenite.
[0034] It should be noted that the theoretical TiO2 content of ilmenite is 55.66%, and the theoretical TiO2 content of rutile is 90-99%, both of which are ideal sources for producing qualified titanium concentrate. However, for the high-sphene ilmenite, sphene is a monoclinic island structure silicate titanium-containing mineral with a molecular formula of CaTi[SiO4]O, a specific gravity of 3.52-3.54, and a theoretical TiO2 content of 40.82%, which does not reach the grade of qualified titanium concentrate (TiO2≥46%), and is very likely to affect the grade of the obtained titanium concentrate; in addition, the flotation properties of sphene are similar to those of other aluminosilicate gangue minerals, making it difficult to separate by flotation process; and, although the specific gravity of sphene is lower than that of ilmenite, it is much higher than that of other gangue minerals, and is easily mixed into ilmenite minerals to affect the TiO2 grade of the obtained titanium concentrate, and it is not easy to achieve effective separation by gravity separation process. Therefore, it can be seen that compared with ilmenite and rutile, it is significantly more difficult to extract titanium and reduce impurities in the iron-draining tailings of the high-sphene ilmenite, because it also requires the separation of sphene minerals from high-titanium-containing minerals such as ilmenite.
[0035] In this regard, it is worth noting that the method provided by the present disclosure can not only remove a large amount of gangue minerals through the strong magnetic tailings when the high-sphene ilmenite is subjected to titanium extraction and impurity reduction, but also can prevent a large amount of pyrite in the iron-separation tailings from affecting the zoning and separation of sphene and ilmenite in the subsequent gravity separation and upgrading by placing the desulfurization flotation in advance, so that sphene and ilmenite can be better separated in the gravity separation and upgrading, and finally achieve the effect of avoiding the disadvantage that the traditional flotation process is extremely difficult to achieve effective separation of low-titanium minerals such as sphene and high-titanium minerals such as ilmenite, reducing the content of sphene in the titanium concentrate, thereby avoiding its effect on the quality of the titanium concentrate.
[0036] The beneficial effects of the present disclosure are:
[0037] 1. The present disclosure provides a method for extracting titanium and reducing impurities in iron tailings containing ilmenite, which greatly improves the separation effect by placing sulfur removal flotation before gravity separation and quality improvement, and facilitates the subsequent output of titanium concentrate;
[0038] 2. The present disclosure provides a method for titanium extraction and impurity reduction of iron ore tailings containing ilmenite, which adopts gravity separation and dry magnetic separation to replace conventional flotation titanium selection, which can not only greatly reduce production costs and secondary pollution caused by chemical agents used in flotation, but also improve the grade of titanium concentrate and the recovery effect of titanium resources, avoiding the shortcomings of flotation titanium selection that cannot produce qualified titanium concentrate and easily pollute the environment;
[0039] 3. The present invention provides a method for extracting titanium and reducing impurities in iron-separated tailings containing ilmenite minerals, which can not only produce titanium concentrate with a TiO2 grade of more than 46%, sulfur concentrate with an S grade of more than 43%, and iron concentrate with a TFe grade of more than 60%, but also solve the difficulty of producing qualified titanium concentrate from high-sphene ilmenite ore, thereby improving resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS
[0040] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual process of the method involved in the embodiments of the present disclosure.
[0041] Figure 1 The present invention provides a process flow chart of a method for extracting titanium and reducing impurities in iron ore tailings containing ilmenite. DETAILED DESCRIPTION
[0042] The technical solutions in some embodiments of the present disclosure are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.
[0043] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.
[0044] When describing some embodiments, the expression "A and / or B" may be used. It is easy to understand that "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.
[0045] When describing some embodiments, the expressions "at least one of A, B and C" and "at least one of A, B or C" may be used, both of which have the same meaning and include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.
[0046] Example 1
[0047] This embodiment provides a method for extracting titanium and reducing impurities in iron-separated tailings containing ilmenite minerals, using iron-separated tailings from a large domestic iron mine as raw material. In the iron-separated tailings, the grade of TiO2 is 4.0% to 4.5%, the titanium content in sphene is 70% to 75%, and the titanium content in ilmenite is 25% to 30%.
[0048] like Figure 1 As shown, the above method includes:
[0049] S1. Strong magnetic tailings discarding: A vertical ring strong magnetic separator is used to discard the iron tailings with a magnetic field strength of 0.7T to obtain strong magnetic concentrate and strong magnetic tailings;
[0050] S2. Gravity separation pre-enrichment: using a sludge shaking table to perform gravity separation pre-enrichment roughing selection on the strong magnetic concentrate to obtain gravity separation pre-enrichment roughing concentrate, gravity separation pre-enrichment roughing middling and gravity separation pre-enrichment roughing tailings; using a sludge shaking table to perform gravity separation pre-enrichment scavenging selection on the gravity separation pre-enrichment roughing middling to obtain gravity separation pre-enrichment scavenging concentrate and gravity separation pre-enrichment scavenging tailings; wherein, the gravity separation pre-enrichment roughing concentrate and the gravity separation pre-enrichment scavenging concentrate are combined into the gravity separation pre-enrichment concentrate; the gravity separation pre-enrichment roughing tailings, the gravity separation pre-enrichment scavenging tailings and the strong magnetic tailings are combined into tailings 1;
[0051] S3. Desulfurization flotation: Desulfurization roughing is performed on the gravity pre-enriched concentrate, and sulfuric acid 1250g / t·feed ore, butyl xanthate 150g / t·feed ore and 2 # Oil 30g / t·feed ore, to obtain desulfurized roughing concentrate and desulfurized roughing tailings; desulfurized roughing tailings were subjected to desulfurization scavenging, and butyl xanthate 50g / t·feed ore and 2 # The desulfurization scavenging concentrate and the desulfurization flotation tailings are obtained by feeding the desulfurization roughing concentrate with 15g / t oil to form a closed-loop operation; the desulfurization scavenging concentrate and the desulfurization flotation tailings are subjected to desulfurization concentration (i.e., blank concentration) to form a sulfur concentrate and a desulfurization concentration tailings; wherein the desulfurization scavenging concentrate and the desulfurization concentration tailings are combined and returned to the desulfurization roughing to form a closed-loop operation;
[0052] S4. Gravity separation and upgrading: The desulfurized flotation tailings are subjected to gravity separation and upgrading by using a sludge shaking table to obtain gravity separation and upgrading concentrate, gravity separation and upgrading middlings, and tailings 2; wherein the gravity separation and upgrading middlings are returned to the gravity separation and upgrading process to achieve self-circulation;
[0053] S5. Dry magnetic separation: Dry magnetic separation is carried out using a titanium dry separator, in which the magnetic field strength of the iron roller is 1200Gs and the magnetic field strength of the titanium roller is 9000Gs, including:
[0054] S51. performing dry magnetic roughing on the gravity-selected upgraded concentrate to obtain a dry magnetic roughing concentrate, a dry magnetic roughing ore, a dry magnetic roughing tailings and a secondary iron concentrate;
[0055] S52. The dry magnetic roughing ore is subjected to dry magnetic scavenging to obtain a dry magnetic scavenging concentrate and a dry magnetic scavenging tailings; wherein the dry magnetic roughing concentrate and the dry magnetic scavenging concentrate are combined into a titanium concentrate; the dry magnetic roughing tailings and the dry magnetic scavenging tailings are combined into tailings 3;
[0056] S6. Grinding: Grinding the secondary iron concentrate, the grinding fineness is -0.075mm 90.18%, to obtain dissociated minerals;
[0057] S7. Weak magnetic iron separation: A wet permanent magnetic weak magnetic separator is used to perform weak magnetic iron separation on the dissociated ore. The magnetic field strength is 0.14T and the mass percentage concentration of the slurry is 25% to obtain iron concentrate and iron middlings.
[0058] The results showed that the grade of TiO2 in the titanium concentrate was 46.75%, the grade of S in the sulfur concentrate was 45.12%, and the grade of TFe in the iron concentrate was 60.77%.
[0059] Example 2
[0060] This embodiment provides a method for extracting titanium and reducing impurities in iron-separated tailings containing ilmenite minerals, using iron-separated tailings from a large domestic vanadium-titanium magnetite mine as raw material. In the iron-separated tailings, the grade of TiO2 is 4.5% to 5.1%, the titanium content in sphene is 60% to 64%, and the titanium content in ilmenite is 36% to 40%.
[0061] like Figure 1 As shown, the above method includes:
[0062] S1. Strong magnetic tailings: Use a flat ring strong magnetic separator to carry out strong magnetic tailings on the iron ore tailings, the magnetic field strength is 0.8T, and obtain strong magnetic concentrate and strong magnetic tailings;
[0063] S2. Gravity separation pre-enrichment: using a spiral chute to carry out gravity separation pre-enrichment roughing selection on the strong magnetic concentrate to obtain gravity separation pre-enrichment roughing concentrate, gravity separation pre-enrichment roughing middling and gravity separation pre-enrichment roughing tailings; using a spiral chute to carry out gravity separation pre-enrichment scavenging selection on the gravity separation pre-enrichment roughing middling to obtain gravity separation pre-enrichment scavenging concentrate and gravity separation pre-enrichment scavenging tailings; wherein, the gravity separation pre-enrichment roughing concentrate and the gravity separation pre-enrichment scavenging concentrate are combined into gravity separation pre-enrichment concentrate; the gravity separation pre-enrichment roughing tailings, the gravity separation pre-enrichment scavenging tailings and the strong magnetic tailings are combined into tailings 1;
[0064] S3. Desulfurization flotation: Desulfurization roughing is performed on the gravity pre-enriched concentrate, and copper sulfate 380g / t·feed, butyl xanthate and isopentyl xanthate 220g / t·feed in a mass ratio of 1:1 and 2 #Oil 30g / t·feed ore, to obtain desulfurized rougher concentrate and desulfurized rougher tailings; desulfurized rougher tailings were subjected to desulfurization scavenging, and butyl xanthate and isopentyl xanthate 50g / t·feed ore and 2 # The desulfurization scavenging concentrate and the desulfurization flotation tailings are obtained by feeding the desulfurization roughing concentrate with 15g / t oil to form a closed-loop operation; the desulfurization scavenging concentrate and the desulfurization flotation tailings are subjected to desulfurization concentration (i.e., blank concentration) to form a sulfur concentrate and a desulfurization concentration tailings; wherein the desulfurization scavenging concentrate and the desulfurization concentration tailings are combined and returned to the desulfurization roughing to form a closed-loop operation;
[0065] S4. Gravity separation and upgrading: The desulfurized flotation tailings are subjected to gravity separation and upgrading by using a sludge shaking table to obtain gravity separation and upgrading concentrate, gravity separation and upgrading middlings, and tailings 2; wherein the gravity separation and upgrading middlings are returned to the gravity separation and upgrading process to achieve self-circulation;
[0066] S5. Dry magnetic separation: Dry magnetic separation is carried out using a titanium dry separator, in which the magnetic field strength of the iron roller is 1200Gs and the magnetic field strength of the titanium roller is 9000Gs, including:
[0067] S51. performing dry magnetic roughing on the gravity-selected upgraded concentrate to obtain a dry magnetic roughing concentrate, a dry magnetic roughing ore, a dry magnetic roughing tailings and a secondary iron concentrate;
[0068] S52. The dry magnetic roughing ore is subjected to dry magnetic scavenging to obtain a dry magnetic scavenging concentrate and a dry magnetic scavenging tailings; wherein the dry magnetic roughing concentrate and the dry magnetic scavenging concentrate are combined into a titanium concentrate; the dry magnetic roughing tailings and the dry magnetic scavenging tailings are combined into tailings 3;
[0069] S6. Grinding: Grinding the secondary iron ore concentrate, the grinding fineness is -0.075mm 93.25%, to obtain dissociated minerals;
[0070] S7. Weak magnetic iron separation: A wet electromagnetic weak magnetic separator is used to perform weak magnetic iron separation on the dissociated ore, with a magnetic field strength of 0.12T and a slurry mass percentage concentration of 25% to obtain iron concentrate and iron middlings.
[0071] The results showed that the grade of TiO2 in the titanium concentrate was 46.54%, the grade of S in the sulfur concentrate was 43.18%, and the grade of TFe in the iron concentrate was 64.20%.
[0072] Comparative Example 1
[0073] Example 1 is compared with reference example 1, wherein the difference between reference example 1 and example 1 is:
[0074] Replace the gravity separation and quality upgrading of S4 and the dry magnetic separation of S5 with titanium flotation, including:
[0075] One roughing, one scavenging and five concentrating operations are carried out. In the roughing operation, 1000g / t of sulfuric acid, 2000g / t of sodium fluorosilicate, 2500g / t of collector MOH and 500g / t of diesel are added in sequence; in the scavenging operation, 300g / t of sulfuric acid, 100g / t of sodium fluorosilicate, 300g / t of collector MOH and 10g / t of diesel are added in sequence; in the five concentrating operations, 400g / t, 300g / t, 200g / t, 100g / t and 100g / t of sulfuric acid are added respectively, and the amounts are all calculated for the flotation operation.
[0076] Other conditions such as the selection of iron ore tailings, the remaining process flow, the selection and dosage of reagents, and condition parameters are the same as those in Example 1 (compared with Example 1, this control example replaces gravity separation and dry magnetic separation with titanium flotation to prove that the method disclosed in the present invention is more effective).
[0077] The results show that the grade of TiO2 in the titanium concentrate is 44.25%, the grade of S in the sulfur concentrate is 42.28%, and the grade of TFe in the iron concentrate is 63.18%. It can be seen that compared with the method provided in Example 1, the quality of the titanium concentrate obtained by the method provided in Comparative Example 1 is poor, and the grade of TiO2 is only 44.25%, which cannot reach the commercial concentrate grade of 46%.
[0078] Comparative Example 2
[0079] Example 1 and Reference Example 2 are used for comparison. Both use the same raw ore. The difference between Reference Example 2 and Example 1 is:
[0080] The order of gravity separation and upgrading of S3 and desulfurization and flotation of S4 is changed, including:
[0081] The gravity separation pre-enriched concentrate is subjected to gravity separation and upgrading by using a sludge shaking table to obtain gravity separation and upgrading concentrate, gravity separation and upgrading middlings and gravity separation and upgrading tailings; wherein the gravity separation and upgrading middlings are returned to the gravity separation and upgrading process to achieve self-circulation;
[0082] The re-selected upgraded concentrate was subjected to desulfurization and roughing, and sulfuric acid 1250g / t·feed ore, butyl xanthate 150g / t·feed ore and 2 # Oil 30g / t·feed ore, to obtain desulfurized roughing concentrate and desulfurized roughing tailings; desulfurized roughing tailings were subjected to desulfurization scavenging, and butyl xanthate 50g / t·feed ore and 2 # The desulfurization scavenging concentrate and the desulfurization flotation tailings are obtained by feeding the desulfurization roughing concentrate with 15g / t oil to form a closed-loop operation; the desulfurization scavenging concentrate and the desulfurization flotation tailings are subjected to desulfurization concentration (i.e., blank concentration) to form a sulfur concentrate and a desulfurization concentration tailings; wherein the desulfurization scavenging concentrate and the desulfurization concentration tailings are combined and returned to the desulfurization roughing to form a closed-loop operation;
[0083] Other conditions such as the selection of iron ore tailings, the remaining process flow, the selection and dosage of reagents, and condition parameters are the same as those in Example 1 (compared with Example 1, this control example swaps the order of gravity separation and desulfurization flotation, and does not put desulfurization flotation in front, in order to prove that the method disclosed in the present invention is more effective).
[0084] The results show that the grade of TiO2 in the titanium concentrate is 45.18%, the grade of S in the sulfur concentrate is 42.89%, and the grade of TFe in the iron concentrate is 63.12%. It can be seen that compared with the method provided in Example 1, the quality of the titanium concentrate obtained by the method provided in Comparative Example 2 is poor, and the grade of TiO2 is only 45.18%, which still cannot reach the commercial concentrate grade of 46%.
[0085] In summary, the method for extracting titanium and reducing impurities in iron-separation tailings containing ilmenite minerals provided in the present invention at least achieves the effect of separating and producing high-quality titanium concentrate from iron-separation tailings containing ilmenite minerals under the conditions of reducing production costs and secondary pollution caused by chemical agents used in flotation.
[0086] The above is only a preferred embodiment of the present disclosure. It should be understood that the present disclosure is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but 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 the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present disclosure, and should be within the scope of protection of the claims attached to the present disclosure.
Claims
1. A method for extracting titanium and reducing impurities from iron ore tailings containing ilmenite, characterized in that: include: The iron ore tailings are subjected to strong magnetic tailings discarding to obtain strong magnetic concentrate and strong magnetic tailings; Carrying out gravity pre-enrichment on the strong magnetic concentrate to obtain gravity pre-enriched concentrate and first tailings; Performing desulfurization flotation on the gravity pre-enriched concentrate to obtain a sulfur concentrate and desulfurization flotation tailings; Gravity separation and upgrading are performed on the desulfurized flotation tailings to obtain gravity separation and upgrading concentrate, gravity separation and upgrading middlings, and second tailings; and The gravity-selected upgraded concentrate is subjected to dry magnetic separation to obtain secondary iron concentrate, titanium concentrate and third tailings.
2. The method according to claim 1, characterized in that The method of performing gravity pre-enrichment on the strong magnetic concentrate to obtain the gravity pre-enriched concentrate and the first tailings comprises: Carrying out gravity separation pre-enrichment roughing on the strong magnetic concentrate to obtain gravity separation pre-enrichment roughing concentrate, gravity separation pre-enrichment roughing mide and gravity separation pre-enrichment roughing tailings; and Carrying out gravity-separation pre-enrichment scavenging on the gravity-separation pre-enrichment roughing ore to obtain gravity-separation pre-enrichment scavenging concentrate and gravity-separation pre-enrichment scavenging tailings; The gravity-separation pre-enriched rougher concentrate and the gravity-separation pre-enriched scavenger concentrate are combined into the gravity-separation pre-enriched concentrate; the gravity-separation pre-enriched rougher tailings, the gravity-separation pre-enriched scavenger tailings and the strong magnetic tailings are combined into the first tailings.
3. The method according to claim 1, characterized in that The method of performing desulfurization flotation on the gravity pre-enriched concentrate to obtain a sulfur concentrate and desulfurization flotation tailings comprises: Performing desulfurization roughing on the gravity pre-enriched concentrate to obtain desulfurization roughing concentrate and desulfurization roughing tailings; Carrying out desulfurization scavenging on the desulfurized rougher tailings to obtain desulfurized scavenging concentrate and the desulfurized flotation tailings; and The desulfurized rougher concentrate is subjected to desulfurization concentration to obtain the sulfur concentrate and desulfurized concentration tailings.
4. The method according to claim 1 or 3, characterized in that: The reagents used in the desulfurization flotation include medium activator, collector and frother; Wherein, the medium activator comprises one of sulfuric acid and copper sulfate; the collector comprises at least one of butyl xanthate, isopentyl xanthate and black medicine; the foaming agent comprises 2 # Oil.
5. The method according to claim 1, characterized in that The step of subjecting the gravity-selected upgraded ore to dry magnetic separation to obtain secondary iron concentrate, titanium concentrate and third tailings comprises: Performing dry magnetic roughing on the re-selected upgraded concentrate to obtain a dry magnetic roughing concentrate, a dry magnetic roughing middling, a dry magnetic roughing tailings and the sub-iron concentrate; and Performing dry magnetic separation scavenging on the dry magnetic roughing ore to obtain dry magnetic separation scavenging concentrate and dry magnetic separation scavenging tailings; Wherein, the dry magnetic separation rougher concentrate and the dry magnetic separation scavenger concentrate are combined into the titanium concentrate; and the dry magnetic separation rougher tailings and the dry magnetic separation scavenger tailings are combined into the third tailings.
6. The method according to claim 1 or 5, characterized in that: The equipment used in the dry magnetic separation includes a titanium dry separator, which includes an iron roller and a titanium roller; Among them, the magnetic field strength of the iron roller is 1000-1200 Gs; the magnetic field strength of the titanium roller is 8600-9100 Gs.
7. The method according to claim 1, characterized in that The magnetic field strength of the strong magnetic tail is 0.7-0.9T.
8. The method according to claim 1, characterized in that Also includes: Grinding the secondary iron ore concentrate to obtain dissociated ore; and The dissociated minerals are subjected to weak magnetic iron separation to obtain iron concentrate and iron middlings.
9. The method according to claim 8, characterized in that The mass percentage of the mineral with a particle size of -0.075 mm in the dissociated mineral is 80% to 95%; And / or, the magnetic field strength of the weak magnetic iron separation is 0.1-0.2T.
10. The method according to claim 1, characterized in that The ilmenite-containing mineral includes high titanite ilmenite.