Gangue mineral dispersion inhibitors, methods of making and using same

Abstract

The application provides a gangue mineral dispersion inhibitor and a preparation method and application thereof, and relates to the field of mineral flotation. The preparation method of the gangue mineral dispersion inhibitor comprises the following steps: mixing phytic acid, oxalic acid and sodium silicate with water to obtain a sodium silicate solution; wherein the mass ratio of the phytic acid, the oxalic acid and the sodium silicate is 1:(1-2):(2-4). The gangue mineral dispersion inhibitor can be used in the process of recovering ilmenite from iron ore tailings. The phytic acid, the oxalic acid and the sodium silicate cooperate with each other, can effectively inhibit various gangue minerals, effectively improve the grade and recovery rate of ilmenite, and improve the problem that ilmenite in the iron ore tailings is difficult to be efficiently recovered.

Description

Technical Field

[0001] This application relates to the field of mineral flotation, and in particular to a gangue mineral dispersion inhibitor, its preparation method, and its application. Background Technology

[0002] Titanium is one of my country's key mineral resources and is of great importance to economic and social development. Due to its excellent properties, titanium is widely used in aerospace vehicles, military and defense equipment, welding anti-corrosion coatings, and advanced medical products.

[0003] Achieving efficient recovery of ilmenite has always been a key research focus in ilmenite beneficiation technology. To address the increasing scarcity of titanium mineral resources and meet the growing demand for titanium metal in socio-economic development, recovering ilmenite from iron ore tailings has become a new approach. The combined high-intensity magnetic-flotation process is widely used due to its high recovery rate and good concentrate quality. However, iron ore tailings often contain magnetic gangue minerals such as sphene, tremolite, amphibole, and biotite during the magnetic pre-enrichment process. These gangue minerals negatively impact the flotation of ilmenite, increasing the difficulty of beneficiation.

[0004] Conventional dispersion inhibitors are insufficient for the efficient recovery of ilmenite from iron ore tailings. Specifically, it is difficult to obtain ilmenite concentrate with a TiO2 grade higher than 45% using conventional dispersion inhibitors. Summary of the Invention

[0005] The purpose of this application is to provide a gangue mineral dispersion inhibitor, its preparation method, and its application, in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A method for preparing a gangue mineral dispersion inhibitor includes: mixing phytic acid, oxalic acid, sodium silicate and water to obtain a sodium silicate solution; wherein the mass ratio of phytic acid to oxalic acid and sodium silicate is 1:(1~2):(2~4).

[0008] According to an embodiment of this application, the preparation method includes:

[0009] Phytic acid is mixed with water to obtain a phytic acid solution;

[0010] Oxalic acid is mixed with water to obtain an oxalic acid solution;

[0011] Sodium silicate is mixed with water to obtain a sodium silicate solution;

[0012] The phytic acid solution is mixed with the oxalic acid solution and the sodium silicate solution to obtain a gangue mineral dispersion inhibitor.

[0013] The phytic acid solution has the same mass concentration as the oxalic acid solution and the sodium silicate solution, and the mass ratio of the phytic acid solution to the oxalic acid solution and the sodium silicate solution is 1:(1~2):(2~4).

[0014] According to embodiments of this application, the mass concentrations of the phytic acid solution, the oxalic acid solution, and the sodium silicate solution are 5-15%.

[0015] This application also provides a gangue mineral dispersion inhibitor, which is prepared by the method described above for preparing gangue mineral dispersion inhibitors.

[0016] This application also provides the application of the gangue mineral dispersion inhibitors as described above in the process of recovering ilmenite from iron ore tailings.

[0017] According to an embodiment of this application, the process of recovering ilmenite from iron ore tailings includes: magnetically separating the iron ore tailings; mixing the magnetically separated iron ore tailings with a collector, an auxiliary collector, a pH adjuster, and the gangue mineral dispersion inhibitor; and then performing flotation to obtain ilmenite.

[0018] According to an embodiment of this application, the pH adjuster includes sulfuric acid, and the pH adjuster is used to control the pH value of the slurry at 2 to 6.

[0019] According to embodiments of this application, the process of recovering ilmenite from iron ore tailings after magnetic separation further includes:

[0020] The iron tailings that have undergone magnetic separation are then ground.

[0021] The iron tailings after grinding are desulfurized to obtain sulfides and tailings after floating sulfur.

[0022] The tailings after sulfur flotation are subjected to one roughing and one scavenging process to obtain titanium rough concentrate.

[0023] The titanium rough concentrate is subjected to multiple fine-tuning processes to obtain ilmenite concentrate; wherein the fine-tuning process is performed 4 to 5 times.

[0024] The process of roughing, scavenging, and cleaning further includes adding a collector, an auxiliary collector, a pH adjuster, and a gangue mineral dispersion inhibitor to the flotation system.

[0025] According to an embodiment of this application, the amount of gangue mineral dispersion inhibitor used during the coarse selection is 1000~2000g / t.

[0026] According to an embodiment of this application, desulfurization treatment of iron ore tailings after grinding includes: mixing the iron ore tailings after grinding with sulfuric acid, butyl xanthate and No. 2 oil, and performing sulfide flotation to obtain sulfides and tailings after sulfur flotation.

[0027] And / or, the collector includes any one of MOH collectors and MOS collectors;

[0028] And / or, the auxiliary collector includes any one of diesel oil or No. 2 oil.

[0029] Compared with the prior art, the beneficial effects of this application include:

[0030] The gangue mineral dispersion inhibitor of this application can be used to recover ilmenite from iron ore beneficiation tailings. The components of this gangue mineral dispersion inhibitor function synergistically and mutually support each other, achieving both dispersion and inhibition effects on various gangue minerals in iron ore beneficiation tailings. Using this gangue mineral dispersion inhibitor in the process of recovering ilmenite from iron ore beneficiation tailings enables the flotation separation of ilmenite from gangue minerals such as sphene, tremolite, amphibole, and biotite. It also disperses slime and activates ilmenite, effectively improving the grade and recovery rate of ilmenite.

[0031] The method for preparing gangue mineral dispersion inhibitor provided in this application has the advantages of simple operation, green and environmentally friendly raw materials, and low production cost. Furthermore, the gangue mineral dispersion inhibitor prepared by this method has excellent flotation separation effect and can be applied to the process of recovering ilmenite from iron ore tailings. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope of this application.

[0033] Figure 1 The flowchart for the open-circuit test is shown in Application Example 1 of this application. Detailed Implementation

[0034] To better illustrate the technical solution provided in this application, the technical solution will be described in its entirety before the embodiments, as follows:

[0035] Existing dispersion inhibitors are insufficient for the efficient recovery of ilmenite from iron ore tailings. Specifically, it is difficult to obtain ilmenite concentrate with a TiO2 grade higher than 45% using existing dispersion inhibitors.

[0036] This application provides a method for preparing a gangue mineral dispersion inhibitor, comprising: mixing phytic acid, oxalic acid, sodium silicate and water to obtain a sodium silicate solution; wherein the mass ratio of phytic acid to oxalic acid and sodium silicate is 1:(1~2):(2~4).

[0037] HSiO3 produced by the hydrolysis of sodium silicate - and SiO3 2- Sodium silicate can chemically adsorb onto gangue minerals, hindering the adsorption of collectors on the gangue mineral surface and thus dispersing the gangue minerals. Additionally, sodium silicate can enhance the hydrophilicity and hydration layer strength of the slime, improving flotation selectivity and efficiency. Phytic acid can increase the negative potential of the slime through chelation, while simultaneously increasing the electrostatic repulsion between slimes, thereby dispersing the pulp. Furthermore, phytic acid can bind to active sites on the surface of gangue minerals, preventing collector adsorption and reducing the flotation activity of gangue minerals, thus improving the separation efficiency of ilmenite and gangue minerals. Oxalic acid has an activating effect on ilmenite, improving the flotation separation efficiency of ilmenite and gangue minerals. Oxalic acid can also chelate with gangue minerals, preventing collector adsorption of gangue minerals, thereby improving the separation efficiency of ilmenite and gangue minerals. The gangue mineral dispersion inhibitor of this application can be used to recover ilmenite from iron ore beneficiation tailings. The synergistic effect of phytic acid, oxalic acid, and sodium silicate can effectively inhibit various gangue minerals, thereby effectively improving the grade and recovery rate of ilmenite and solving the problem of inefficient recovery of ilmenite from iron ore beneficiation tailings.

[0038] Specifically, phytic acid and oxalic acid ionize in water to generate a large number of anions. These anions chelate with the calcium and magnesium ions exposed on the surface of gangue minerals after dissociation, forming insoluble salts. These salts then transform into stable and non-decomposable complexes, occupying adsorption sites on the gangue mineral surface. Simultaneously, the mixture of phytic acid, oxalic acid, and sodium silicate produces a large number of hydrophilic silicate particles. These particles selectively adsorb onto the gangue mineral surface, preventing the collector from adsorbing gangue minerals and thus inhibiting their adsorption. When the amount of phytic acid and / or oxalic acid and / or sodium silicate is too low, the inhibitor cannot bind to all the exposed calcium and magnesium active sites on the gangue minerals, resulting in some gangue minerals being adsorbed by the collector and leading to poor selective inhibition. When the amount of sodium silicate is too high, a large amount of Si(OH)3 is generated in the slurry system. - Si(OH)3 2- Si(OH)4 will hinder the adsorption of the collector on the surface of ilmenite, resulting in a low recovery rate of ilmenite.

[0039] Furthermore, the mass ratio of phytic acid to oxalic acid and sodium silicate can be any value between 1:1:3, 1:2:4, 1:2:2 or 1:(1~2):(2~4).

[0040] Furthermore, the gangue minerals include at least one of sphene, tremolite, amphibole, and biotite.

[0041] According to an embodiment of this application, the preparation method includes:

[0042] Phytic acid is mixed with water to obtain a phytic acid solution;

[0043] Oxalic acid is mixed with water to obtain an oxalic acid solution;

[0044] Sodium silicate is mixed with water to obtain a sodium silicate solution;

[0045] The phytic acid solution is mixed with the oxalic acid solution and the sodium silicate solution to obtain a gangue mineral dispersion inhibitor.

[0046] The phytic acid solution has the same mass concentration as the oxalic acid solution and the sodium silicate solution, and the mass ratio of the phytic acid solution to the oxalic acid solution and the sodium silicate solution is 1:(1~2):(2~4).

[0047] The product obtained using this method exhibits excellent flotation separation performance for gangue minerals in iron ore tailings. Furthermore, this method is simple to operate and uses inexpensive raw materials, making it suitable for large-scale application and promotion.

[0048] According to embodiments of this application, the mass concentrations of the phytic acid solution, the oxalic acid solution, and the sodium silicate solution are 5-15%.

[0049] Specifically, the mass concentrations of the phytic acid solution, oxalic acid solution, and sodium silicate solution are 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, or any value between 5% and 15%.

[0050] This application also provides a gangue mineral dispersion inhibitor, which is prepared by the method described above for preparing gangue mineral dispersion inhibitors.

[0051] This application also provides the application of the gangue mineral dispersion inhibitors as described above in the process of recovering ilmenite from iron ore tailings.

[0052] According to an embodiment of this application, the process of recovering ilmenite from iron ore tailings includes: magnetically separating the iron ore tailings; mixing the magnetically separated iron ore tailings with a collector, an auxiliary collector, a pH adjuster, and the gangue mineral dispersion inhibitor; and then performing flotation to obtain ilmenite.

[0053] According to an embodiment of this application, the pH adjuster includes sulfuric acid, and the pH adjuster is used to control the pH value of the slurry at 2 to 6.

[0054] In the process of recovering ilmenite from iron ore tailings, pH adjusters can adjust the pH and inhibit gangue minerals. The gangue mineral dispersion inhibitor of this application also has the effect of inhibiting gangue minerals. Using the gangue mineral dispersion inhibitor of this application can reduce the amount of pH adjuster required and effectively improve the grade and recovery rate of ilmenite.

[0055] Furthermore, the amount of pH adjuster used during rough selection is 1000~1200g / t.

[0056] According to embodiments of this application, the process of recovering ilmenite from iron ore tailings after magnetic separation further includes:

[0057] The iron tailings that have undergone magnetic separation are then ground.

[0058] The iron tailings after grinding are desulfurized to obtain sulfides and tailings after floating sulfur.

[0059] The tailings after sulfur flotation are subjected to one roughing and one scavenging process to obtain titanium rough concentrate.

[0060] The titanium rough concentrate is subjected to multiple fine-tuning processes to obtain ilmenite concentrate; wherein the fine-tuning process is performed 4 to 5 times.

[0061] The process of roughing, scavenging, and cleaning further includes adding a collector, an auxiliary collector, a pH adjuster, and a gangue mineral dispersion inhibitor to the flotation system.

[0062] Furthermore, magnetic separation refers to performing two-stage strong magnetic separation.

[0063] According to embodiments of this application, the amount of gangue mineral dispersion inhibitor used during the roughing process is 1000-2000 g / t. This enables flotation separation of ilmenite and gangue minerals, ensuring a high grade and high recovery rate for ilmenite. Insufficient gangue mineral dispersion inhibitor will result in a low ilmenite recovery rate. Excessive gangue mineral dispersion inhibitor will hinder the adsorption of the collector on the ilmenite surface, leading to a low ilmenite recovery rate.

[0064] Furthermore, the amount of gangue mineral dispersion inhibitor used during the roughing process can be any value between 1000 g / t, 1100 g / t, 1200 g / t, 1300 g / t, 1400 g / t, 1500 g / t, 1600 g / t, 1700 g / t, 1800 g / t, 1900 g / t, 2000 g / t, or 1000-2000 g / t.

[0065] According to an embodiment of this application, the iron ore tailings after grinding are subjected to desulfurization treatment: the iron ore tailings after grinding are mixed with sulfuric acid, butyl xanthate and No. 2 oil, and sulfide flotation is carried out to obtain sulfides and tailings after sulfur flotation.

[0066] And / or, the collector includes any one of MOH collectors and MOS collectors;

[0067] And / or, the auxiliary collector includes any one of diesel oil or No. 2 oil.

[0068] As used in this article:

[0069] "Prepared from" is synonymous with "comprising". The terms "comprising", "including", "having", "containing", or any other variations thereof as used herein are intended to cover non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0070] The conjunction "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for associated conventional impurities. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0071] When a quantity, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1–5” is disclosed, the described range should be interpreted as including ranges “1–4”, “1–3”, “1–2”, “1–2 and 4–5”, “1–3 and 5”, etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0072] In these embodiments, unless otherwise specified, the portions and percentages are all by weight.

[0073] "Parts by mass" refers to the basic unit of measurement that expresses the mass ratio of multiple components. One part can represent any unit mass, such as 1g or 2.689g. If we say that component A has "a" parts by mass and component B has "b" parts by mass, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it can mean that the mass of component A is aK and the mass of component B is bK (where K is any number representing a multiplier). It is important to understand that, unlike parts by mass, the sum of the mass parts of all components is not limited to 100 parts.

[0074] "And / or" is used to indicate that one or both of the described situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0075] The implementation schemes of this application will be described in detail below with reference to specific embodiments. However, those skilled in the art will understand that the following embodiments are only for illustrating this application and should not be regarded as limiting the scope of this application. Unless otherwise specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments used without specified manufacturers are all conventional products that can be purchased commercially.

[0076] I. Examples of Preparation of Gangue Mineral Dispersion Inhibitors

[0077] Example 1

[0078] The preparation method of the gangue mineral dispersion inhibitor in Example 1 includes the following steps:

[0079] Step 1: Weigh phytic acid, oxalic acid and sodium silicate separately, and prepare phytic acid solution, oxalic acid solution and sodium silicate solution with a mass concentration of 10% each.

[0080] Step 2: Take out the solution prepared in Step 1 according to the mass ratio of phytic acid solution: oxalic acid solution: sodium silicate solution of 1:1:3. In Example 1, the mass ratio of phytic acid to oxalic acid and sodium silicate is 1:1:3.

[0081] Step 3: Thoroughly stir and mix the three solutions taken in Step 2 to obtain the gangue mineral dispersion inhibitor.

[0082] Example 2

[0083] The preparation method of the gangue mineral dispersion inhibitor in Example 2 includes the following steps:

[0084] Step 1: Weigh phytic acid, oxalic acid and sodium silicate separately, and prepare phytic acid solution, oxalic acid solution and sodium silicate solution with a mass concentration of 10% each.

[0085] Step 2: Take out the solution prepared in Step 1 according to the mass ratio of phytic acid solution: oxalic acid solution: sodium silicate solution of 1:2:4. In Example 2, the mass ratio of phytic acid to oxalic acid and sodium silicate is 1:2:4.

[0086] Step 3: Thoroughly stir and mix the three solutions taken in Step 2 to obtain the gangue mineral dispersion inhibitor.

[0087] Example 3

[0088] The preparation method of the gangue mineral dispersion inhibitor in Example 3 includes the following steps:

[0089] Step 1: Weigh phytic acid, oxalic acid and sodium silicate separately, and prepare phytic acid solution, oxalic acid solution and sodium silicate solution with a mass concentration of 10% each.

[0090] Step 2: Take out the solution prepared in Step 1 according to the mass ratio of phytic acid solution: oxalic acid solution: sodium silicate solution of 1:2:2. In Example 3, the mass ratio of phytic acid to oxalic acid and sodium silicate is 1:2:2.

[0091] Step 3: Thoroughly stir and mix the three solutions taken in Step 2 to obtain the gangue mineral dispersion inhibitor.

[0092] Comparative Example 1

[0093] Gangue mineral dispersion inhibitors were prepared according to the method of Example 1, with other steps being the same as in Example 1, except that: phytic acid solution was not added in the preparation method of Comparative Example 1, and the mass ratio of oxalic acid to sodium silicate in Comparative Example 1 was 1:3.

[0094] Comparative Example 2

[0095] The gangue mineral dispersion inhibitor was prepared according to the method of Example 1, with the other steps being the same as in Example 1. The difference was that no oxalic acid solution was added in the preparation method of Comparative Example 2, and the mass ratio of phytic acid to sodium silicate in Comparative Example 2 was 1:3.

[0096] Comparative Example 3

[0097] The gangue mineral dispersion inhibitor was prepared according to the method of Example 1, with other steps being the same as in Example 1. The difference was that sodium silicate solution was not added in the preparation method of Comparative Example 3, and the mass ratio of phytic acid to oxalic acid in Comparative Example 3 was 1:1.

[0098] Comparative Example 4

[0099] The gangue mineral dispersion inhibitor was prepared according to the method of Example 1. The other steps were the same as in Example 1, except that: in Comparative Example 4, the mass ratio of phytic acid solution: oxalic acid solution: sodium silicate solution was 0.5:1:3, and in Example 1, the mass ratio of phytic acid to oxalic acid and sodium silicate was 0.5:1:3.

[0100] Comparative Example 5

[0101] The gangue mineral dispersion inhibitor was prepared according to the method of Example 1. The other steps were the same as in Example 1, except that: in Comparative Example 5, the mass ratio of phytic acid solution: oxalic acid solution: sodium silicate solution was 1.5:1:3, and in Example 1, the mass ratio of phytic acid to oxalic acid and sodium silicate was 1.5:1:3.

[0102] II. Application Examples of Gangue Mineral Dispersion Inhibitors

[0103] Application Example 1

[0104] Application Example 1 is an example of the application of the gangue mineral dispersion inhibitor prepared in Example 1 in the recovery of ilmenite from iron tailings in Inner Mongolia.

[0105] The mineral composition of iron tailings: Iron tailings are mainly composed of ilmenite and sphene, with rutile occasionally visible. Other metallic minerals are mainly pyrite, with trace amounts of pyrrhotite. Non-metallic minerals are mainly tremolite, followed by diopside, with small amounts of chlorite, biotite, epidote, grossular, albite, potassium feldspar, apatite, and calcite.

[0106] Iron tailings were subjected to a strong magnetic pre-enrichment process to obtain flotation feed containing tremolite, diopside, and biotite. The total iron (TFe) grade in the feed was 14.12%, and the TiO2 grade was 19.85%. The gangue composition in the feed was complex, making flotation separation quite difficult.

[0107] Iron tailings after magnetic separation Figure 1 Titanium feedstock in the process.

[0108] The feed material is ground and stirred to prepare the slurry. The slurry undergoes desulfurization, one roughing, one scavenging, and four cleaning processes to obtain ilmenite concentrate.

[0109] The desulfurization agents and dosages used are as follows: sulfuric acid 500g / t, butyl xanthate 60g / t, and No. 2 oil 20g / t.

[0110] The reagents and dosages used in the titanium roughing process are as follows: sulfuric acid 1000g / t, gangue mineral dispersion inhibitor 1000g / t, MOH collector 1600g / t, and diesel oil 200g / t.

[0111] The dosage of titanium sweeping reagents is halved;

[0112] The roughing concentrate and scavenging concentrate are combined for four cleaning processes. The sulfuric acid dosage is 500 g / t, 400 g / t, 300 g / t, and 200 g / t, respectively; the gangue mineral dispersion inhibitor dosage is 600 g / t, 300 g / t, 200 g / t, and 100 g / t, respectively; the MOH collector dosage is 800 g / t, 600 g / t, 400 g / t, and 200 g / t, respectively; and the diesel fuel dosage is 80 g / t, 60 g / t, 40 g / t, and 20 g / t, respectively.

[0113] Open-circuit and closed-circuit tests were conducted on the incoming minerals, respectively. The open-circuit procedure is as follows: Figure 1 As shown, the intermediate ore samples were returned sequentially during the closed-circuit test (intermediate ore 4 and intermediate ore 5 were returned to titanium roughing; intermediate ore 3 was returned to titanium cleaning I; intermediate ore 2 was returned to titanium cleaning II; and intermediate ore 1 was returned to titanium cleaning III). The test results are shown in Table 1.

[0114] Table 1. Experimental results of recovering ilmenite from iron ore tailings in Application Example 1.

[0115]

[0116] As shown in Table 1, adding the gangue mineral dispersion inhibitor of Example 1 resulted in an ilmenite concentrate with a grade of 48.56% in the open-circuit test and 47.55% in the closed-circuit test, with an operating recovery rate of 81.63%. This indicates that the gangue mineral dispersion inhibitor of Example 1 can effectively suppress gangue minerals, thereby obtaining qualified ilmenite concentrate.

[0117] Application Example 2

[0118] Application Example 2 is an example of the application of the gangue mineral dispersion inhibitor prepared in Example 2 in the recovery of ilmenite from iron ore tailings in Hubei Province.

[0119] The iron minerals in iron tailings are predominantly magnetite, with trace amounts of hematite, siderite, and limonite; the titanium minerals are mainly ilmenite and sphene. Other metallic minerals are primarily pyrite, with trace amounts of pyrrhotite. Non-metallic minerals are mainly amphibole, biotite, albite, and quartz, with minor amounts of potassium feldspar, grossular, and chlorite.

[0120] Iron tailings were pre-enriched using two strong magnetic processes to obtain flotation feed containing amphibole, biotite, and chlorite. The total iron (TFe) grade in the feed was 15.89%, and the TiO2 grade was 18.76%. The feed had a high gangue content, making subsequent flotation separation difficult.

[0121] After grinding, the feed material is first desulfurized by adding 400g / t of sulfuric acid, 50g / t of butyl xanthate, and 20g / t of No. 2 oil. Then, titanium is separated by flotation using a process of one roughing, one scavenging, and four cleaning steps to obtain ilmenite concentrate.

[0122] The reagents and dosages used in the roughing process are as follows: sulfuric acid 1200g / t, gangue mineral dispersion inhibitor 1400g / t, MOS collector 1800g / t, and diesel oil 200g / t.

[0123] The dosage of titanium sweeping reagents is halved;

[0124] The roughing concentrate and scavenging concentrate are combined for four cleaning processes. The sulfuric acid dosage is 600 g / t, 300 g / t, 200 g / t, and 100 g / t, respectively; the gangue mineral dispersion inhibitor dosage is 700 g / t, 400 g / t, 200 g / t, and 100 g / t, respectively; the MOS collector dosage is 900 g / t, 800 g / t, 400 g / t, and 200 g / t, respectively; and the diesel fuel dosage is 90 g / t, 80 g / t, 40 g / t, and 20 g / t, respectively.

[0125] According to the above procedures and reagent dosages, open-circuit and closed-circuit tests were conducted on the feedstock. In the closed-circuit test, the middlings were returned sequentially (middlings 4 and 5 were returned to titanium roughing; middlings 3 was returned to titanium cleaning I; middlings 2 was returned to titanium cleaning II; and middlings 1 was returned to titanium cleaning III). The test results are shown in Table 2.

[0126] Table 2. Experimental results of recovering ilmenite from iron ore tailings in Application Example 2.

[0127]

[0128] As shown in Table 2, adding the gangue mineral dispersion inhibitor of Example 2 resulted in an ilmenite concentrate with a grade of 47.81% in the open-circuit test and 46.77% in the closed-circuit test, with an operating recovery rate of 80.46%. This indicates that the gangue mineral dispersion inhibitor of Example 2 can effectively suppress gangue minerals, thereby obtaining a titanium concentrate with TiO2 > 45% in ilmenite.

[0129] Application Example 3

[0130] Application Example 3 is an example of the application of the gangue mineral dispersion inhibitor prepared in Example 3 in the recovery of ilmenite from iron ore tailings.

[0131] The mineral composition of the iron tailings in Application Example 3 is as follows: the titanium minerals in the iron tailings are mostly ilmenite, with small amounts of titanomagnetite and rutile. The gangue minerals are mainly plagioclase and quartz, followed by biotite, chlorite, and amphibole, with small amounts of sphene, pyrite, potassium feldspar, muscovite, and trace amounts of calcite, chalcopyrite, grossular, etc.

[0132] Iron tailings were pre-enriched using two strong magnetic processes to obtain flotation feed containing plagioclase, biotite, and chlorite. The total iron (TFe) grade in the feed was 14.21%, and the TiO2 grade was 18.52%. The feed had a high gangue content, making subsequent flotation separation difficult.

[0133] The recovery conditions for recovering ilmenite from iron ore tailings in Application Example 3 are the same as those in Application Example 1, except that the gangue mineral dispersion inhibitor prepared in Example 3 is used in Application Example 3.

[0134] The experimental results of Application Example 3 are shown in Table 3.

[0135] Table 3. Experimental Results of Recovering Ilmenite from Iron Ore Tailings in Application Example 3

[0136]

[0137] As shown in Table 3, adding the gangue mineral dispersion inhibitor of Example 3 resulted in an ilmenite concentrate with a grade of 48.45% in the open-circuit test and 47.54% in the closed-circuit test, with an operating recovery rate of 81.53%. This indicates that the gangue mineral dispersion inhibitor of Example 3 can effectively suppress gangue minerals, thereby obtaining qualified ilmenite concentrate.

[0138] Comparative Application Example 1

[0139] Comparative Application Example 1 is an example of the application of the gangue mineral dispersion inhibitor prepared in Comparative Example 1 in the recovery of ilmenite from iron ore tailings.

[0140] The mineral composition of the iron ore tailings and the recovery conditions for recovering ilmenite from the iron ore tailings in Comparative Application Example 1 are the same as those in Application Example 1. The only difference is that the gangue mineral dispersion inhibitor prepared in Comparative Example 1 is used in Comparative Application Example 1.

[0141] The experimental results of the comparative application example 1 are shown in Table 4. The closed-circuit test can only obtain ilmenite concentrate with a TiO2 grade of 42.97%, and the TiO2 grade of ilmenite concentrate is less than 45%.

[0142] Table 4. Closed-circuit test results for recovering ilmenite from iron ore tailings in Comparative Application Example 1

[0143]

[0144] Comparative Application Example 2

[0145] Comparative Application Example 2 is an example of the application of the gangue mineral dispersion inhibitor prepared in Comparative Example 2 in the recovery of ilmenite from iron ore tailings.

[0146] The mineral composition of the iron ore tailings in Comparative Application Example 2 and the recovery conditions for recovering ilmenite from the iron ore tailings are the same as those in Application Example 1. The only difference is that the gangue mineral dispersion inhibitor prepared in Comparative Example 2 is used in Comparative Application Example 2.

[0147] The experimental results of the comparative application example 2 are shown in Table 5. The TiO2 grade of the ilmenite concentrate obtained by the closed-circuit test is 43.56%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0148] Table 5. Closed-circuit test results for recovering ilmenite from iron ore tailings in Comparative Application Example 2

[0149]

[0150] Comparative Application Example 3

[0151] Comparative Application Example 3 is an example of the application of the gangue mineral dispersion inhibitor prepared in Comparative Example 3 in the recovery of ilmenite from iron ore tailings.

[0152] The mineral composition of the iron ore tailings in Comparative Application Example 3 and the recovery conditions for recovering ilmenite from the iron ore tailings are the same as those in Application Example 1. The only difference is that the gangue mineral dispersion inhibitor prepared in Comparative Example 3 is used in Comparative Application Example 3.

[0153] The experimental results of the comparative application example 3 are shown in Table 6. The TiO2 grade of the ilmenite concentrate obtained by the closed-circuit test is 42.91%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0154] Table 6. Closed-circuit test results for the recovery of ilmenite from iron ore tailings in Comparative Application Example 3

[0155]

[0156] Comparative Application Example 4

[0157] Comparative Application Example 4 is an example of the application of the gangue mineral dispersion inhibitor prepared in Comparative Example 4 in the recovery of ilmenite from iron ore tailings.

[0158] The mineral composition of the iron ore tailings in Comparative Application Example 4 and the recovery conditions for recovering ilmenite from the iron ore tailings are the same as those in Application Example 1. The only difference is that the gangue mineral dispersion inhibitor prepared in Comparative Example 4 is used in Comparative Application Example 4.

[0159] The experimental results of the comparative application example 4 are shown in Table 7. The TiO2 grade of the ilmenite concentrate obtained by the closed-circuit test is 41.59%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0160] Table 7. Closed-circuit test results for the recovery of ilmenite from iron ore tailings in Comparative Application Example 4

[0161]

[0162] Comparative Application Example 5

[0163] Comparative Application Example 5 is an example of the application of the gangue mineral dispersion inhibitor prepared in Comparative Example 5 in the recovery of ilmenite from iron ore tailings.

[0164] The mineral composition of the iron ore tailings in Comparative Application Example 5 and the recovery conditions for recovering ilmenite from the iron ore tailings are the same as those in Application Example 1. The only difference is that the gangue mineral dispersion inhibitor prepared in Comparative Example 5 is used in Comparative Application Example 5.

[0165] The test results of the comparative application example 5 are shown in Table 8. The TiO2 grade of the ilmenite concentrate obtained by the closed-circuit test is 44.11%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0166] Table 8. Closed-circuit test results for the recovery of ilmenite from iron ore tailings in Comparative Application Example 5

[0167]

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0169] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the foregoing claims, any of the claimed embodiments can be used in any combination. The information disclosed in this background section is intended only to enhance the understanding of the general background of this application and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A method for preparing a gangue mineral dispersion inhibitor for flotation recovery of ilmenite from iron ore tailings, characterized in that, include: Phytic acid, oxalic acid, sodium silicate, and water are mixed to obtain a sodium silicate solution; wherein the mass ratio of phytic acid to oxalic acid and sodium silicate is 1:(1~2):(2~4). The preparation method includes: Phytic acid is mixed with water to obtain a phytic acid solution; Oxalic acid is mixed with water to obtain an oxalic acid solution; Sodium silicate is mixed with water to obtain a sodium silicate solution; The phytic acid solution is mixed with the oxalic acid solution and the sodium silicate solution to obtain a gangue mineral dispersion inhibitor. The phytic acid solution has the same mass concentration as the oxalic acid solution and the sodium silicate solution, and the mass ratio of the phytic acid solution to the oxalic acid solution and the sodium silicate solution is 1:(1~2):(2~4). The mass concentrations of the phytic acid solution, the oxalic acid solution, and the sodium silicate solution are 5-15%. The flotation recovery of ilmenite from iron ore tailings includes: Magnetic separation will be performed on iron tailings; The iron tailings that have undergone magnetic separation are then ground. The iron tailings after grinding are mixed with sulfuric acid, butyl xanthate and No. 2 oil, and then subjected to sulfide flotation to obtain sulfides and tailings after sulfur flotation. The tailings after sulfur flotation are subjected to one roughing and one scavenging process to obtain titanium rough concentrate. The titanium rough concentrate is subjected to multiple fine-tuning processes to obtain ilmenite concentrate; wherein the fine-tuning process is performed 4 to 5 times. The process of roughing, scavenging, and cleaning further includes adding a collector, an auxiliary collector, a pH adjuster, and a gangue mineral dispersion inhibitor to the flotation system. The amount of gangue mineral dispersion inhibitor used during the roughing process is 1000~2000 g / t; The collector includes any one of MOH collector and MOS collector; The auxiliary collector includes either diesel or No. 2 oil.

2. A gangue mineral dispersion inhibitor, characterized in that, The gangue mineral dispersion inhibitor is prepared by the method described in claim 1 for preparing the gangue mineral dispersion inhibitor for flotation recovery of ilmenite from iron ore tailings.

3. The application of the gangue mineral dispersion inhibitor as described in claim 2 in the process of recovering ilmenite from iron ore tailings.

4. The application according to claim 3, characterized in that, The pH adjuster includes sulfuric acid, and is used to control the pH value of the slurry between 2 and 6.

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