Gangue mineral dispersion inhibitor as well as preparation method and application thereof

Abstract

The invention 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, sodium silicate and water to obtain a sodium silicate solution; wherein the mass ratio of the phytic acid to the oxalic acid to 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 separation tailings, phytic acid is matched with oxalic acid and sodium silicate, various gangue minerals can be effectively inhibited, the grade and the recovery rate of ilmenite are effectively improved, and the problem that ilmenite in the iron separation tailings is difficult to efficiently recover is solved.

Description

Technical Field

[0001] The present application relates to the field of mineral flotation, and in particular to a gangue mineral dispersion inhibitor and a preparation method and application thereof. Background Art

[0002] As one of my country's key mineral resources, titanium is vital 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] How to achieve efficient recovery of ilmenite has always been the research focus of ilmenite beneficiation technology. In order to solve the increasing scarcity of titanium mineral resources and meet the needs of social and economic development for titanium metal, recycling ilmenite from iron ore tailings has become a new way. The strong magnetic-flotation combined process is widely used due to its high recovery rate and good concentrate quality. Iron ore tailings often contain magnetic gangue minerals such as sphene, tremolite, hornblende, biotite, etc. during the magnetic pre-enrichment process. These gangue minerals affect the flotation of ilmenite, resulting in increased difficulty in beneficiation.

[0004] Conventional dispersible depressants make it difficult to efficiently recover ilmenite from iron ore tailings. Specifically, it is difficult to obtain ilmenite concentrate with a TiO2 grade higher than 45% using conventional dispersible depressants. Summary of the invention

[0005] The purpose of the present application is to provide a gangue mineral dispersion inhibitor and a preparation method and application thereof to solve the above problems.

[0006] To achieve the above objectives, this application adopts the following technical solutions: A method for preparing a gangue mineral dispersion inhibitor comprises: mixing phytic acid, oxalic acid, sodium silicate and water to obtain a sodium silicate solution; wherein the mass ratio of the phytic acid to the oxalic acid and the sodium silicate is 1:(1-2):(2-4).

[0007] According to an embodiment of the present application, the preparation method comprises: mixing phytic acid with water to obtain a phytic acid solution; mixing oxalic acid with water to obtain an oxalic acid solution; mixing sodium silicate 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 mass concentrations of the phytic acid solution, the oxalic acid solution and the sodium silicate solution are the same, 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).

[0008] According to an embodiment of the present application, the mass concentration of the phytic acid solution, the oxalic acid solution, and the sodium silicate solution is 5-15%.

[0009] The present application also provides a gangue mineral dispersion inhibitor, which is prepared by the preparation method of the gangue mineral dispersion inhibitor described above.

[0010] The present application also provides the use of the gangue mineral dispersion inhibitor as described above in the process of recovering ilmenite from iron ore tailings.

[0011] According to an embodiment of the present application, the process of recovering ilmenite from iron ore tailings includes: subjecting the iron ore tailings to magnetic separation, mixing the magnetically separated iron ore tailings with a collector, an auxiliary collector, a pH adjuster, and the gangue mineral dispersion inhibitor, and performing flotation to obtain ilmenite.

[0012] According to an embodiment of the present application, the pH adjuster includes sulfuric acid, and the pH adjuster is used to control the pH value of the slurry within a range of 2-6.

[0013] According to an embodiment of the present application, after the iron ore tailings are subjected to magnetic separation, the process of recovering ilmenite from the iron ore tailings further comprises: Grinding the iron ore tailings obtained through magnetic separation; Desulfurizing the iron ore tailings after the grinding to obtain sulfide and sulfur-floating tailings; The tailings after sulfur flotation are subjected to a roughing separation and a scavenging separation to obtain a titanium rough concentrate; The titanium crude concentrate is subjected to multiple beneficiation to obtain ilmenite concentrate; wherein the number of times of beneficiation is 4 to 5 times; When the roughing, scavenging and cleaning are carried out, the method further includes: adding a collector, an auxiliary collector, a pH adjuster and the gangue mineral dispersion inhibitor into the flotation system.

[0014] According to an embodiment of the present application, the amount of the gangue mineral dispersion inhibitor used during the roughing is 1000-2000 g / t.

[0015] According to an embodiment of the present application, the desulfurization treatment of the iron ore tailings after the ore grinding includes: mixing the iron ore tailings after the ore grinding with sulfuric acid, butyl xanthate and No. 2 oil, and performing sulfide flotation to obtain sulfide and sulfur-floated tailings; And / or, the collector includes any one of a MOH collector and a MOS collector; And / or, the auxiliary collector includes any one of diesel and No. 2 oil.

[0016] Compared with the prior art, the beneficial effects of this application include: The gangue mineral dispersion inhibitor of the present application can be used to recover ilmenite from iron ore tailings. The components in the gangue mineral dispersion inhibitor of the present application support and cooperate with each other in function, and can have the effect of dispersing and inhibiting various gangue minerals in the iron ore tailings. In the process of recovering ilmenite from iron ore tailings, the gangue mineral dispersion inhibitor of the present application can be used to achieve the flotation separation of ilmenite and gangue minerals such as sphene, tremolite, hornblende, biotite, etc. in the iron ore tailings, and can also play the role of dispersing ore mud and activating ilmenite, which can effectively improve the grade and recovery rate of ilmenite.

[0017] The preparation method of the gangue mineral dispersion inhibitor provided in the present application has the advantages of simple operation, green and environmentally friendly raw materials, and low production cost. The gangue mineral dispersion inhibitor prepared by this method has excellent flotation separation effect and can be used in the process of recovering ilmenite from iron ore tailings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0019] Figure 1 This is a flow chart of the open circuit test in Application Example 1 of this application. DETAILED DESCRIPTION

[0020] In order to better explain the technical solution provided by this application, before the embodiments, the technical solution is first described as a whole, as follows: It is difficult to efficiently recover ilmenite from iron ore tailings using existing dispersible depressants. Specifically, it is difficult to obtain ilmenite concentrate with a TiO2 grade higher than 45% using existing dispersible depressants.

[0021] The present 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 the phytic acid to the oxalic acid and the sodium silicate is 1:(1-2):(2-4).

[0022] HSiO3 produced by hydrolysis of sodium silicate - and SiO3 2-It can produce chemical adsorption with gangue minerals, hinder the adsorption of collectors on the surface of gangue minerals, and have a dispersing effect on gangue minerals; in addition, sodium silicate can enhance the hydrophilicity and hydration layer strength of ore mud, and improve the selectivity and efficiency of flotation. Phytic acid can increase the negative potential of ore mud through chelation, and at the same time increase the electrostatic repulsion between ore muds, thereby dispersing the ore pulp; moreover, phytic acid can combine with the active sites on the surface of gangue minerals, prevent the adsorption of collectors on the surface of gangue minerals, reduce the flotation activity of gangue minerals, and improve the separation efficiency of ilmenite and gangue minerals. Oxalic acid has an activation effect on ilmenite, and can improve the flotation separation efficiency of ilmenite and gangue minerals. Oxalic acid can also chelate with gangue minerals, prevent the collector from adsorbing gangue minerals, and thus improve the separation efficiency of ilmenite and gangue minerals. The gangue mineral dispersion inhibitor of the present application can be used to recover ilmenite from iron ore tailings. Phytic acid cooperates with oxalic acid and sodium silicate to effectively inhibit a variety of gangue minerals, effectively improve the grade and recovery rate of ilmenite, and improve the problem of difficult efficient recovery of ilmenite in iron ore tailings.

[0023] Specifically, phytic acid and oxalic acid are ionized in water to generate a large number of anions. The generated anions react with calcium and magnesium ions exposed on the surface of gangue minerals after dissociation to form insoluble salts, which are then converted into stable and non-decomposable complexes, occupying adsorption points on the surface of gangue minerals. At the same time, the mixture of phytic acid, oxalic acid and sodium silicate will produce a large number of hydrophilic silicate colloids. These silicate colloids can selectively adsorb on the surface of gangue minerals, so that the collector has no adsorption points and can inhibit the collector from adsorbing gangue minerals. When the dosage of phytic acid and / or oxalic acid and / or sodium silicate is too low, the inhibitor will not be able to bind to all calcium and magnesium active sites exposed by gangue minerals, and some gangue minerals will be adsorbed by the collector, resulting in poor selective inhibition of gangue minerals. When the dosage of sodium silicate is too large, a large amount of Si(OH)3 will be 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.

[0024] Furthermore, the mass ratio of the phytic acid to the oxalic acid and the sodium silicate can be 1:1:3, 1:2:4, 1:2:2 or any value between 1:(1-2):(2-4).

[0025] Furthermore, the gangue mineral includes at least one of sphene, tremolite, hornblende and biotite.

[0026] According to an embodiment of the present application, the preparation method comprises: mixing phytic acid with water to obtain a phytic acid solution; mixing oxalic acid with water to obtain an oxalic acid solution; mixing sodium silicate 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 mass concentrations of the phytic acid solution, the oxalic acid solution and the sodium silicate solution are the same, 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).

[0027] The product obtained by this method has excellent flotation separation effect on gangue minerals in iron ore tailings. In addition, this method has the advantages of simple operation and low raw material price, which is conducive to large-scale application and promotion.

[0028] According to an embodiment of the present application, the mass concentration of the phytic acid solution, the oxalic acid solution, and the sodium silicate solution is 5-15%.

[0029] Specifically, the mass concentration of the phytic acid solution, the oxalic acid solution, and the sodium silicate solution is 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, or any value between 5% and 15%.

[0030] The present application also provides a gangue mineral dispersion inhibitor, which is prepared by the preparation method of the gangue mineral dispersion inhibitor described above.

[0031] The present application also provides the use of the gangue mineral dispersion inhibitor as described above in the process of recovering ilmenite from iron ore tailings.

[0032] According to an embodiment of the present application, the process of recovering ilmenite from iron ore tailings includes: subjecting the iron ore tailings to magnetic separation, mixing the magnetically separated iron ore tailings with a collector, an auxiliary collector, a pH adjuster, and the gangue mineral dispersion inhibitor, and performing flotation to obtain ilmenite.

[0033] According to an embodiment of the present application, the pH adjuster includes sulfuric acid, and the pH adjuster is used to control the pH value of the slurry within a range of 2-6.

[0034] In the process of recovering ilmenite from iron ore tailings, the pH adjuster can adjust the pH and inhibit the gangue minerals. The gangue mineral dispersion inhibitor of the present application also has the effect of inhibiting gangue minerals. The use of the gangue mineral dispersion inhibitor of the present application can reduce the amount of the pH adjuster and effectively improve the grade and recovery rate of ilmenite.

[0035] Furthermore, the amount of pH adjuster used during roughing is 1000-1200 g / t.

[0036] According to an embodiment of the present application, after the iron ore tailings are subjected to magnetic separation, the process of recovering ilmenite from the iron ore tailings further comprises: Grinding the iron ore tailings obtained through magnetic separation; Desulfurizing the iron ore tailings after the grinding to obtain sulfide and sulfur-floating tailings; The tailings after sulfur flotation are subjected to a roughing separation and a scavenging separation to obtain a titanium rough concentrate; The titanium crude concentrate is subjected to multiple beneficiation to obtain ilmenite concentrate; wherein the number of times of beneficiation is 4 to 5 times; When the roughing, scavenging and cleaning are carried out, the method further includes: adding a collector, an auxiliary collector, a pH adjuster and the gangue mineral dispersion inhibitor into the flotation system.

[0037] Furthermore, performing magnetic separation refers to performing two-stage high-intensity magnetic separation.

[0038] According to an embodiment of the present application, the amount of the gangue mineral dispersion inhibitor used during the roughing is 1000-2000 g / t. Thus, flotation separation of ilmenite and gangue minerals can be achieved, ensuring that the ilmenite has a higher grade and a higher recovery rate. If the amount of the gangue mineral dispersion inhibitor used is too small, the recovery rate of the ilmenite will be lower. If the amount of the gangue mineral dispersion inhibitor used is too large, the excessive gangue mineral dispersion inhibitor will hinder the adsorption of the collector on the surface of the ilmenite, resulting in a lower recovery rate of the ilmenite.

[0039] Furthermore, the amount of the gangue mineral dispersion inhibitor used during the roughing can be 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 any value between 1000 and 2000 g / t.

[0040] According to an embodiment of the present application, the iron ore tailings after the ore grinding are subjected to desulfurization treatment: the iron ore tailings after the ore grinding are mixed with sulfuric acid, butyl xanthate and No. 2 oil, and sulfide flotation is performed to obtain sulfide and sulfur-floated tailings; And / or, the collector includes any one of a MOH collector and a MOS collector; And / or, the auxiliary collector includes any one of diesel and No. 2 oil.

[0041] As used herein: "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0042] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0043] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0044] In these examples, parts and percentages are by mass unless otherwise indicated.

[0045] "Mass parts" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass parts of component A are a parts and the mass parts of component B are b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass parts of all components is not limited to 100 parts.

[0046] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0047] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0048] 1. Example of preparing gangue mineral dispersion inhibitor Example 1 The preparation method of the gangue mineral dispersion inhibitor in Example 1 comprises the following steps: Step 1, weigh phytic acid, oxalic acid and sodium silicate respectively, and prepare phytic acid solution, oxalic acid solution and sodium silicate solution with a mass concentration of 10%.

[0049] Step 2, taking 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.

[0050] Step 3, fully stirring and mixing the three solutions taken out in step 2 to obtain a gangue mineral dispersion inhibitor.

[0051] Example 2 The preparation method of the gangue mineral dispersion inhibitor in Example 2 comprises the following steps: Step 1, weigh phytic acid, oxalic acid and sodium silicate respectively, and prepare phytic acid solution, oxalic acid solution and sodium silicate solution with a mass concentration of 10%.

[0052] Step 2, taking 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.

[0053] Step 3, fully stirring and mixing the three solutions taken out in step 2 to obtain a gangue mineral dispersion inhibitor.

[0054] Example 3 The preparation method of the gangue mineral dispersion inhibitor in Example 3 comprises the following steps: Step 1, weigh phytic acid, oxalic acid and sodium silicate respectively, and prepare phytic acid solution, oxalic acid solution and sodium silicate solution with a mass concentration of 10%.

[0055] Step 2, taking 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.

[0056] Step 3, fully stirring and mixing the three solutions taken out in step 2 to obtain a gangue mineral dispersion inhibitor.

[0057] Comparative Example 1 The gangue mineral dispersion inhibitor was prepared by referring to the method of Example 1. The other steps were the same as those of Example 1, except that no phytic acid solution was added in the preparation method of Example 1, and the mass ratio of oxalic acid to sodium silicate in Example 1 was 1:3.

[0058] Comparative Example 2 The gangue mineral dispersion inhibitor was prepared by referring to the method of Example 1. The other steps were the same as those of Example 1, except that no oxalic acid solution was added in the preparation method of Comparative Example 2. In Comparative Example 2, the mass ratio of phytic acid to sodium silicate was 1:3.

[0059] Comparative Example 3 The gangue mineral dispersion inhibitor was prepared by referring to the method of Example 1. The other steps were the same as those of Example 1, except that no sodium silicate solution was added in the preparation method of Comparative Example 3, and in Comparative Example 3, the mass ratio of phytic acid to oxalic acid was 1:1.

[0060] Comparative Example 4 The gangue mineral dispersion inhibitor was prepared by referring to the method of Example 1. The other steps were the same as those of 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.

[0061] Comparative Example 5 The gangue mineral dispersion inhibitor was prepared by referring to the method of Example 1. The other steps were the same as those of 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.

[0062] 2. Application examples of gangue mineral dispersion inhibitors Application Example 1 Application Example 1 is an application example of the gangue mineral dispersion inhibitor prepared in Example 1 in recovering ilmenite from an iron ore tailings in Inner Mongolia.

[0063] Mineral composition of iron ore tailings: Iron ore tailings are mainly ilmenite and titanite, with rutile occasionally seen. Other metal 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 garnet, albite, potassium feldspar, apatite and calcite.

[0064] After the strong magnetic pre-enrichment process, the iron tailings were used to obtain the flotation raw materials containing tremolite, diopside and biotite. The total iron TFe grade in the flotation material was 14.12% and the TiO2 grade was 19.85%. The gangue composition in the flotation material was complex, and flotation separation was difficult.

[0065] The iron tailings after magnetic separation are Figure 1 Titanium ore selection in the process.

[0066] The floating material is ground and stirred to prepare the slurry. The slurry undergoes desulfurization, a roughing operation, a scavenging operation and four concentration processes to obtain ilmenite concentrate.

[0067] Among them, the reagents and dosage used in the desulfurization operation are: sulfuric acid 500g / t, butyl xanthate 60g / t, No. 2 oil 20g / t; The reagents and dosages used in titanium roughing are: sulfuric acid 1000g / t, gangue mineral dispersion inhibitor 1000g / t, MOH collector 1600g / t, diesel 200g / t; The amount of titanium sweeping agent used is halved; The rougher concentrate and scavenger concentrate are combined for four rounds of concentration. The amounts of sulfuric acid are 500g / t, 400g / t, 300g / t and 200g / t respectively, the amounts of gangue mineral dispersion inhibitor are 600g / t, 300g / t, 200g / t and 100g / t respectively, the amounts of MOH collector are 800g / t, 600g / t, 400g / t and 200g / t respectively, and the amounts of diesel are 80g / t, 60g / t, 40g / t and 20g / t respectively.

[0068] Open circuit and closed circuit tests are carried out on the floating minerals respectively. The open circuit process is as follows: Figure 1 As shown, in the closed-circuit test, the intermediate ores are returned sequentially (intermediate ores 4 and 5 are returned to titanium roughing; intermediate ores 3 are returned to titanium concentration I; intermediate ores 2 are returned to titanium concentration II, and intermediate ores 1 are returned to titanium concentration III). The test results are shown in Table 1.

[0069] Table 1 Test results of recovering ilmenite from iron ore tailings in Application Example 1

[0070] It can be seen from Table 1 that by adding the gangue mineral dispersion inhibitor of Example 1, an ilmenite concentrate with a grade of 48.56% can be obtained in the open circuit test, the ilmenite concentrate grade is 47.55% in the closed circuit test, and the operating recovery rate is 81.63%, which shows that the gangue mineral dispersion inhibitor of Example 1 can effectively inhibit the gangue minerals, thereby obtaining a qualified ilmenite concentrate.

[0071] Application Example 2 Application Example 2 is an application example of the gangue mineral dispersion inhibitor prepared in Example 2 in recovering ilmenite from an iron ore tailings in Hubei.

[0072] The iron minerals in the iron tailings are mostly magnetite, with trace amounts of hematite, siderite and limonite; the titanium minerals are mainly ilmenite and sphene. Other metal minerals are mainly pyrite, with trace amounts of pyrrhotite. Non-metallic minerals are mainly hornblende, biotite, albite, quartz, with a small amount of potassium feldspar, grossular garnet, chlorite, etc.

[0073] After two stages of strong magnetic pre-enrichment, the iron tailings were used to obtain flotation raw materials containing amphibole, biotite and chlorite. The total iron TFe grade in the flotation material was 15.89% and the TiO2 grade was 18.76%. The gangue content in the flotation material was high, making subsequent flotation separation difficult.

[0074] After grinding, the floating material is desulfurized by adding 400g / t sulfuric acid, 50g / t butyl xanthate and 20g / t No. 2 oil. Then, a one-roughing-one-sweeping-four-fine process is adopted to carry out titanium flotation separation to obtain ilmenite concentrate.

[0075] Among them, the reagents and dosages used in the roughing are: sulfuric acid 1200g / t, gangue mineral dispersion inhibitor 1400g / t, MOS collector 1800g / t, diesel 200g / t; The amount of titanium sweeping agent used is halved; The rougher concentrate and scavenger concentrate are combined for four rounds of concentration. The amounts of sulfuric acid are 600g / t, 300g / t, 200g / t and 100g / t respectively, the amounts of gangue mineral dispersion inhibitor are 700g / t, 400g / t, 200g / t and 100g / t respectively, the amounts of MOS collector are 900g / t, 800g / t, 400g / t and 200g / t respectively, and the amounts of diesel are 90g / t, 80g / t, 40g / t and 20g / t respectively.

[0076] According to the above process and reagent dosage, open-circuit and closed-circuit tests were carried out on the floating raw materials. In the closed-circuit test, the intermediate ores were returned in sequence (intermediate ores 4 and 5 were returned to titanium roughing; intermediate ores 3 were returned to titanium concentration I; intermediate ores 2 were returned to titanium concentration II, and intermediate ores 1 were returned to titanium concentration III). The test results are shown in Table 2.

[0077] Table 2 Test results of application example 2 for recovering ilmenite from iron ore tailings

[0078] It can be seen from Table 2 that by adding the gangue mineral dispersion inhibitor of Example 2, an ilmenite concentrate with a grade of 47.81% can be obtained in the open circuit test, the ilmenite concentrate grade is 46.77% in the closed circuit test, and the operating recovery rate is 80.46%, which shows that the gangue mineral dispersion inhibitor of Example 2 can effectively inhibit the gangue minerals, thereby obtaining a titanium concentrate with TiO2>45% in the ilmenite.

[0079] Application Example 3 Application Example 3 is an application example of the gangue mineral dispersion inhibitor prepared in Example 3 in recovering ilmenite from iron ore tailings.

[0080] Mineral composition of iron ore tailings in Application Example 3: Most of the titanium minerals in iron ore tailings are ilmenite, with a small amount of titanium-containing magnetite and rutile. Gangue minerals are mainly plagioclase and quartz, followed by biotite, chlorite, amphibole, a small amount of sphene, pyrite, potassium feldspar, muscovite, and trace amounts of calcite, chalcopyrite, grossular garnet, etc.

[0081] After two stages of strong magnetic pre-enrichment, the iron tailings were used to obtain flotation raw materials containing plagioclase, biotite and chlorite. The total iron TFe grade in the flotation material was 14.21% and the TiO2 grade was 18.52%. The gangue content in the flotation material was high, making subsequent flotation separation difficult.

[0082] The recovery conditions of ilmenite from iron ore tailings in Application Example 3 are the same as those in Application Example 1, with the only difference being that the gangue mineral dispersion inhibitor prepared in Example 3 is used in Application Example 3.

[0083] The test results of Application Example 3 are shown in Table 3.

[0084] Table 3 Test results of recovering ilmenite from iron ore tailings in Application Example 3

[0085] It can be seen from Table 3 that by adding the gangue mineral dispersion inhibitor of Example 3, an ilmenite concentrate with a grade of 48.45% can be obtained in the open circuit test, the ilmenite concentrate grade is 47.54% in the closed circuit test, and the operating recovery rate is 81.53%, which shows that the gangue mineral dispersion inhibitor of Example 3 can effectively inhibit the gangue minerals, thereby obtaining a qualified ilmenite concentrate.

[0086] Comparative application example 1 Comparative Application Example 1 is an application example of the gangue mineral dispersion inhibitor prepared in Comparative Example 1 in recovering ilmenite from iron ore tailings.

[0087] The mineral composition of the iron ore tailings and the recovery conditions of ilmenite from the iron ore tailings in Comparative Application Example 1 are the same as those in Application Example 1, with the only difference being that the gangue mineral dispersion inhibitor prepared in Comparative Example 1 is used in Comparative Application Example 1.

[0088] The test results of 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 the ilmenite concentrate is less than 45%.

[0089] Table 4 Comparative Application Example 1 Closed Circuit Test Results of Recovering Ilmenite from Iron Ore Tailings

[0090] Comparative Application Example 2 Comparative Application Example 2 is an application example of the gangue mineral dispersion inhibitor prepared in Comparative Example 2 in recovering ilmenite from iron ore tailings.

[0091] The mineral composition of the iron ore tailings and the recovery conditions of ilmenite from the iron ore tailings in Comparative Application Example 2 are the same as those in Application Example 1, with the only difference being that the gangue mineral dispersion inhibitor prepared in Comparative Example 2 is used in Comparative Application Example 2.

[0092] The test results of comparative application example 2 are shown in Table 5. The TiO2 grade of the ilmenite concentrate obtained in the closed-circuit test is 43.56%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0093] Table 5 Comparative Application Example 2 Closed Circuit Test Results of Recovering Ilmenite from Iron Ore Tailings

[0094] Comparative Application Example 3 Comparative Application Example 3 is an application example of the gangue mineral dispersion inhibitor prepared in Comparative Example 3 in recovering ilmenite from iron ore tailings.

[0095] The mineral composition of the iron ore tailings and the recovery conditions of ilmenite from the iron ore tailings in Comparative Application Example 3 are the same as those in Application Example 1, with the only difference being that the gangue mineral dispersion inhibitor prepared in Comparative Example 3 is used in Comparative Application Example 3.

[0096] The test results of comparative application example 3 are shown in Table 6. The TiO2 grade of the ilmenite concentrate obtained in the closed-circuit test is 42.91%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0097] Table 6 Comparative Application Example 3 Closed Circuit Test Results of Recovering Ilmenite from Iron Ore Tailings

[0098] Comparative Application Example 4 Comparative Application Example 4 is an application example of the gangue mineral dispersion inhibitor prepared in Comparative Example 4 in recovering ilmenite from iron ore tailings.

[0099] The mineral composition of the iron ore tailings and the recovery conditions of ilmenite from the iron ore tailings in Comparative Application Example 4 are the same as those in Application Example 1, with the only difference being that the gangue mineral dispersion inhibitor prepared in Comparative Example 4 is used in Comparative Application Example 4.

[0100] The test results of comparative application example 4 are shown in Table 7. The TiO2 grade of the ilmenite concentrate obtained in the closed-circuit test is 41.59%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0101] Table 7 Comparative Application Example 4 Closed Circuit Test Results of Recovering Ilmenite from Iron Ore Tailings

[0102] Comparative Application Example 5 Comparative Application Example 5 is an application example of the gangue mineral dispersion inhibitor prepared in Comparative Example 5 in recovering ilmenite from iron ore tailings.

[0103] The mineral composition of the iron ore tailings and the recovery conditions of ilmenite from the iron ore tailings in Comparative Application Example 5 are the same as those in Application Example 1, with the only difference being that the gangue mineral dispersion inhibitor prepared in Comparative Example 5 is used in Comparative Application Example 5.

[0104] The test results of comparative application example 5 are shown in Table 8. The TiO2 grade of the ilmenite concentrate obtained in the closed-circuit test is 44.11%, and the TiO2 grade of the ilmenite concentrate is less than 45%.

[0105] Table 8 Comparative Application Example 5 Closed Circuit Test Results of Recovering Ilmenite from Iron Ore Tailings

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0107] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A method for preparing a gangue mineral dispersion inhibitor, 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 the phytic acid to the oxalic acid and the sodium silicate is 1:(1-2):(2-4).

2. The method for preparing a gangue mineral dispersion inhibitor according to claim 1, characterized in that: The preparation method comprises: mixing phytic acid with water to obtain a phytic acid solution; mixing oxalic acid with water to obtain an oxalic acid solution; mixing sodium silicate 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 mass concentrations of the phytic acid solution, the oxalic acid solution and the sodium silicate solution are the same, 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).

3. The preparation method according to claim 2, characterized in that: The mass concentration of the phytic acid solution, the oxalic acid solution and the sodium silicate solution is 5-15%.

4. A gangue mineral dispersion inhibitor, characterized in that: The gangue mineral dispersion inhibitor is prepared by the preparation method of the gangue mineral dispersion inhibitor according to any one of claims 1 to 3.

5. Use of the gangue mineral dispersion inhibitor as claimed in claim 4 in the process of recovering ilmenite from iron ore tailings.

6. The use according to claim 5, characterized in that: The process of recovering ilmenite from iron ore tailings comprises: subjecting the iron ore tailings to magnetic separation, mixing the magnetically separated iron ore tailings with a collector, an auxiliary collector, a pH adjuster, and the gangue mineral dispersion inhibitor, and flotating to obtain ilmenite.

7. The use according to claim 6, characterized in that: The pH adjuster includes sulfuric acid, and the pH adjuster is used to control the pH value of the slurry to be between 2 and 6.

8. The use according to claim 6, characterized in that: After the iron ore tailings are subjected to magnetic separation, the process of recovering ilmenite from the iron ore tailings also includes: Grinding the iron ore tailings obtained through magnetic separation; Desulfurizing the iron ore tailings after the grinding to obtain sulfide and sulfur-floating tailings; The tailings after sulfur flotation are subjected to a roughing separation and a scavenging separation to obtain a titanium rough concentrate; The titanium crude concentrate is subjected to multiple beneficiation to obtain ilmenite concentrate; wherein the number of times of beneficiation is 4 to 5 times; When the roughing, scavenging and cleaning are carried out, the method further includes: adding a collector, an auxiliary collector, a pH adjuster and the gangue mineral dispersion inhibitor into the flotation system.

9. The use according to claim 8, characterized in that: The amount of the gangue mineral dispersion inhibitor used during the roughing process is 1000-2000 g / t.

10. The use according to claim 8 or 9, characterized in that: The desulfurization treatment of the iron ore tailings after the ore grinding includes: mixing the iron ore tailings after the ore grinding with sulfuric acid, butyl xanthate and No. 2 oil, and performing sulfide flotation to obtain sulfide and sulfur-floated tailings; And / or, the collector includes any one of a MOH collector and a MOS collector; And / or, the auxiliary collector includes any one of diesel and No. 2 oil.

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