Method for recovering titanium from iron separation tailings of high sphene type ilmenite

Abstract

The invention relates to the technical field of mineral recovery, and provides a method for recovering titanium from iron separation tailings of high sphene type ilmenite, which comprises the following steps: carrying out gravity separation and tailing discarding on the iron separation tailings to obtain gravity separation and tailing discarding concentrate and gravity separation and tailing discarding tailings; the reselection tailings-discarding concentrate is subjected to sulfur removal flotation, and sulfur concentrate and sulfur removal flotation tailings are obtained; the desulfurization flotation tailings are subjected to gravity concentration and enrichment, and gravity concentration and enrichment concentrate and gravity concentration and enrichment tailings are obtained; carrying out weak magnetic iron removal on the reselection enriched concentrate to obtain iron ore concentrate and weak magnetic tailings; and strong magnetic enrichment recovery is conducted on the weak magnetic tailings, and titanium concentrate and strong magnetic tailings are obtained. The method provided by the invention at least can realize effective separation between low-titanium minerals such as sphene and high-titanium minerals such as ilmenite, and improves the recovery effect of titanium resources and the grade of the obtained titanium concentrate under the condition of reducing the production cost and secondary pollution caused by chemical agents used for flotation.

Description

Technical Field

[0001] The present disclosure relates to the technical field of mineral recovery, for example, to a method for recovering titanium from iron ore tailings of high-sphene ilmenite ore. Background Art

[0002] Titanium reserves on Earth are very abundant, with an abundance of 0.61% in the earth's crust. There are about 140 known titanium minerals, but the main ones used in industry are ilmenite (FeTiO3) and rutile (TiO2). At present, more than 30 countries in the world have titanium resources, but titanium resources are mainly distributed in Australia, South Africa, Canada, China and India; among them, Canada, China and India are mainly rock mines; Australia and the United States are mainly sand mines; and South Africa is very rich in rock mines and sand mines.

[0003] According to public data from the United States Geological Survey (USGS), the total global resources of anatase, ilmenite and rutile exceed 2 billion tons; among them, the reserves of ilmenite are about 720 million tons, accounting for 92% of the world's titanium ore, and the reserves of rutile are about 47 million tons. The total reserves of the two are about 767 million tons; China's ilmenite reserves account for 28% of the world's reserves, ranking first in the world.

[0004] The main titanium resources used in China include ilmenite, rutile and titanomagnetite. Ilmenite rock is mainly vanadium-titanium magnetite, and the main beneficiation process is gravity separation and magnetic separation pre-enrichment followed by flotation. However, 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 meet the grade of qualified titanium concentrate (TiO2≥46%); and the flotation properties of sphene are similar to those of other aluminosilicate gangue minerals, making it difficult to separate by flotation; at the same time, although the specific gravity of sphene is lower than that of ilmenite, it is much higher than that of other gangue minerals, and it is easy to mix with ilmenite minerals to affect the TiO2 grade of titanium concentrate, and it is not easy to achieve effective separation by gravity separation. Therefore, how to separate sphene minerals from high-titanium-containing minerals such as ilmenite is particularly important for producing high-quality titanium concentrate, thereby improving the quality and reducing impurities of titanium concentrate.

[0005] In this regard, Chinese patent document CN112121993A discloses a beneficiation process for wet-selected titanium concentrate of titanium middlings, which mainly discloses that the product obtained after desulfurization of titanium middlings (i.e., raw materials) with a TiO2 grade of about 34% is subjected to iron removal, and then the titanium rough concentrate obtained after iron removal is subjected to roughing and sweeping to obtain titanium concentrate; in addition, Chinese patent document CN112871438A discloses a method for recovering ilmenite from iron-selected tailings, including strong magnetic tailings, closed-circuit grinding, re-selection pre-enrichment to a TiO2 grade of about 35%, pre-enrichment concentrate desulfurization, desulfurization concentrate iron removal, and strong magnetic enrichment of iron-removed concentrate titanium concentrate, which can improve the grade of titanium concentrate while improving the recovery rate of titanium concentrate, thereby improving resource utilization and reducing environmental pollution. However, the above patent document is only applicable to Panxi and other titanium-containing minerals with ilmenite as the main ores.

[0006] In summary, there is an urgent need for a method for recovering titanium from the iron ore tailings of high-sphene ilmenite. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for recovering titanium from the iron ore tailings of high-sphene ilmenite, so as to at least achieve effective separation between low-titanium minerals such as sphene and high-titanium minerals such as ilmenite, and to improve the recovery effect of titanium resources and the grade of the obtained titanium concentrate under the conditions of reducing production costs and secondary pollution caused by chemical agents used in flotation.

[0008] The purpose of this disclosure is achieved through the following technical solutions:

[0009] On the one hand, a method for recovering titanium from the iron-separation tailings of high-sphene ilmenite is provided. The method comprises: performing gravity separation and tailings discarding on the iron-separation tailings to obtain gravity separation tailings concentrate and gravity separation tailings; performing desulfurization flotation on the gravity separation tailings concentrate to obtain sulfur concentrate and desulfurization flotation tailings; performing gravity separation and enrichment on the desulfurization flotation tailings to obtain gravity separation enrichment concentrate and gravity separation enrichment tailings; performing weak magnetic iron removal on the gravity separation enrichment concentrate to obtain iron concentrate and weak magnetic tailings; and performing strong magnetic enrichment and recovery on the weak magnetic tailings to obtain titanium concentrate and strong magnetic tailings.

[0010] In some embodiments, the gravity-separation and tailings discarding of the iron-separated tailings to obtain gravity-separation and tailings discarding concentrate and gravity-separation and tailings discarding tailings include: performing gravity-separation and tailings discarding roughing selection on the iron-separated tailings to obtain gravity-separation and tailings discarding roughing concentrate, gravity-separation and tailings discarding roughing mid-point and gravity-separation and tailings discarding roughing tailings; and performing gravity-separation and tailings discarding scavenging selection on the gravity-separation and tailings discarding roughing mid-point to obtain gravity-separation and tailings discarding scavenging concentrate and gravity-separation and tailings discarding scavenging tailings; wherein the gravity-separation and tailings discarding roughing concentrate and the gravity-separation and tailings discarding scavenging concentrate are combined into the gravity-separation and tailings discarding concentrate, and the gravity-separation and tailings discarding roughing tailings are combined into the gravity-separation and tailings discarding tailings.

[0011] In some examples, the equipment used for the gravity separation tailings discarding includes at least one of a spiral chute, a sludge shaking table, and a sand shaking table.

[0012] In some embodiments, the desulfurization flotation of the gravity separation tailings concentrate to obtain sulfur concentrate and desulfurization flotation tailings includes: performing desulfurization roughing selection on the gravity separation tailings concentrate to obtain desulfurization roughing concentrate and desulfurization roughing tailings; performing desulfurization scavenging selection on the desulfurization roughing tailings to obtain desulfurization scavenging concentrate and the desulfurization flotation tailings; and performing desulfurization concentration on the desulfurization roughing concentrate to obtain the sulfur concentrate and desulfurization concentration tailings.

[0013] In some examples, the desulfurization scavenging concentrate is combined with the desulfurization beneficiation tailings and returned to the desulfurization rougher.

[0014] 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.

[0015] In some examples, the sulfur removal roughing uses the media activator, the collector, and the frother.

[0016] 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.

[0017] In some examples, the desulfurization sweep employs the collector and the frother.

[0018] 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.

[0019] In some embodiments, the gravity-separation and enrichment of the desulfurized flotation tailings to obtain gravity-separation enriched concentrate and gravity-separation enriched tailings includes: performing gravity-separation enrichment and roughing selection on the desulfurized flotation tailings to obtain gravity-separation enriched roughing concentrate, gravity-separation enriched roughing mide and gravity-separation enriched roughing tailings; and performing gravity-separation enrichment and scavenging selection on the gravity-separation enriched roughing mide to obtain gravity-separation enriched scavenging concentrate and gravity-separation enriched scavenging tailings; wherein the gravity-separation enriched roughing concentrate and the gravity-separation enriched scavenging concentrate are combined into the gravity-separation enriched concentrate; and the gravity-separation enriched roughing tailings and the gravity-separation enriched scavenging tailings are combined into the gravity-separation enriched tailings.

[0020] In some examples, the equipment used for the gravity concentration includes at least one of a spiral chute, a slime shaker, and a sand shaker.

[0021] In some embodiments, the strong magnetic enrichment and recovery of the weak magnetic tailings to obtain titanium concentrate and strong magnetic tailings includes: performing strong magnetic roughing on the weak magnetic tailings to obtain strong magnetic roughing concentrate and strong magnetic roughing tailings; performing strong magnetic scavenging on the strong magnetic roughing tailings to obtain strong magnetic scavenging concentrate and the strong magnetic tailings; and performing strong magnetic concentration on the strong magnetic roughing concentrate to obtain the titanium concentrate and strong magnetic concentration tailings.

[0022] In some examples, the high-intensity magnetic scavenging concentrate is combined with the high-intensity magnetic concentrator tailings and returned to the high-intensity magnetic roughing.

[0023] In some embodiments, the magnetic field strength of the strong magnetic roughing is 0.7-0.8T.

[0024] In some embodiments, the magnetic field strength of the strong magnetic sweep is 0.7-0.8T.

[0025] In some embodiments, the magnetic field strength of the strong magnetic selection is 0.6-0.7T.

[0026] In some embodiments, the mass percentage concentration of the ore pulp recovered by strong magnetic enrichment is 25% to 50%.

[0027] In some examples, the equipment used for the high-intensity magnetic enrichment and recovery includes a wet drum-type high-intensity magnetic separator.

[0028] In some embodiments, the magnetic field strength of the weak magnetic iron removal is 0.1-0.3T.

[0029] In some embodiments, the mass percentage concentration of the slurry for weak magnetic iron removal is 25% to 50%.

[0030] In some examples, the equipment used for weak magnetic iron removal includes a wet weak magnetic separator.

[0031] 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.

[0032] It should be noted that the method provided by the present invention can avoid the disadvantage that it is extremely difficult to achieve effective separation between low-titanium minerals such as sphene and high-titanium minerals such as ilmenite in traditional flotation processes, thereby reducing the content of sphene in the obtained titanium concentrate to avoid its impact on the quality of the obtained titanium concentrate, and ultimately achieving the effect of improving the recovery effect of titanium resources and the grade of the obtained titanium concentrate under the conditions of reducing production costs and secondary pollution caused by chemical agents used in flotation.

[0033] Among them, the working principle of the method provided in the present disclosure includes: first, the gravity separation tailings concentrate can be obtained through the gravity separation tailings; then, by placing the desulfurization flotation before the gravity separation enrichment, the influence of sulfide minerals such as pyrite on the recovery of titanium minerals in the subsequent gravity separation enrichment can be eliminated, thereby obtaining the sulfur concentrate and the desulfurization flotation tailings; finally, the high-quality titanium concentrate can be produced through the weak magnetic iron removal and the strong magnetic enrichment recovery.

[0034] In this regard, it is worth noting that the method provided in the present invention can avoid the large amount of pyrite in the iron-separation tailings from affecting the zoning and separation of sphene and ilmenite during the gravity concentration by placing the desulfurization flotation before the gravity concentration enrichment, so that the two can be better separated, greatly improving the separation effect, thereby facilitating the output of the titanium concentrate; on this basis, the method provided in the present invention can avoid the process of combining flotation desulfurization with flotation titanium selection, and by placing the desulfurization flotation before the gravity concentration enrichment to improve the quality of the subsequent gravity concentration enrichment product, and by using the strong magnetic enrichment recovery instead of conventional flotation titanium selection, it can not only greatly reduce the production cost and the secondary pollution caused by the chemical agents used in flotation, but also improve the recovery effect of titanium resources and the grade of the titanium concentrate.

[0035] The beneficial effects of the present disclosure are:

[0036] 1. The present disclosure provides a method for recovering titanium from the iron ore tailings of high-phosphine ilmenite, which greatly improves the separation effect by placing desulfurization flotation before gravity concentration and enrichment, thereby facilitating the subsequent output of titanium concentrate.

[0037] 2. The present invention provides a method for recovering titanium from the iron ore tailings of high-sphene ilmenite ore, which adopts strong magnetic enrichment recovery instead of conventional flotation separation of titanium. It can not only greatly reduce the production cost and the secondary pollution caused by the chemical agents used in flotation, but also improve the recovery effect of titanium resources and the grade of the obtained titanium concentrate, avoiding the shortcomings of flotation separation of titanium that cannot produce qualified titanium concentrate and easily pollute the environment.

[0038] 3. The present invention provides a method for recovering titanium from the iron ore tailings of high-sphene ilmenite, which can not only produce sulfur concentrate with an S grade of more than 40%, but also solve the difficulty of producing qualified titanium concentrate from high-sphene ilmenite, thereby producing high-quality titanium concentrate and ultimately improving resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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.

[0040] Figure 1 The present invention provides a process flow chart of a method for recovering titanium from iron ore tailings of high-sphene ilmenite ore. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] Example 1

[0045] The present embodiment provides a method for recovering titanium from the iron-dressing tailings of high-sphene ilmenite, using the iron-dressing tailings of a large iron mine in northern China as raw materials. In the iron-dressing tailings, the grade of TiO2 is 4.0% to 4.5%, the content of titanium in sphene is 70% to 75%, and the content of titanium in ilmenite is 25% to 30%.

[0046] like Figure 1 As shown, the above method includes:

[0047] S1. Gravity separation and tailings discarding: using a sludge shaking table to carry out gravity separation and tailings discarding roughing selection on the iron ore tailings to obtain gravity separation and tailings discarding roughing concentrate, gravity separation and tailings discarding roughing medium and gravity separation and tailings discarding roughing tailings; using a sludge shaking table to carry out gravity separation and tailings discarding scavenging selection on the gravity separation and tailings discarding roughing medium to obtain gravity separation and tailings discarding scavenging concentrate and gravity separation and tailings discarding scavenging tailings; wherein, the gravity separation and tailings discarding roughing concentrate and the gravity separation and tailings discarding scavenging concentrate are combined into the gravity separation and tailings discarding concentrate, and the gravity separation and tailings discarding roughing tailings and the gravity separation and tailings discarding scavenging tailings are combined into the gravity separation and tailings discarding tailings;

[0048] S2. Desulfurization flotation: Desulfurization roughing is performed on the tailings concentrate of gravity separation, sulfuric acid 1300g / 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;

[0049] S3. Gravity selection and enrichment: using a sludge shaking table to perform gravity selection and enrichment roughing on the desulfurized flotation tailings to obtain gravity selection and enrichment roughing concentrate, gravity selection and enrichment roughing mid-point and gravity selection and enrichment roughing tailings; using a sludge shaking table to perform gravity selection and enrichment scavenging on the gravity selection and enrichment roughing mid-point to obtain gravity selection and enrichment scavenging concentrate and gravity selection and enrichment scavenging tailings; wherein, the gravity selection and enrichment roughing concentrate and the gravity selection and enrichment scavenging concentrate are combined into gravity selection and enrichment concentrate; the gravity selection and enrichment roughing tailings are combined into gravity selection and enrichment scavenging tailings;

[0050] S4. Weak magnetic iron removal: A wet permanent magnetic weak magnetic separator is used to perform weak magnetic iron removal on the re-selected enriched concentrate, the magnetic field strength is 0.15T, the mass percentage concentration of the slurry is 40%, and the iron concentrate and weak magnetic tailings are obtained;

[0051] S5. Strong magnetic enrichment and recovery: The weak magnetic tailings are subjected to strong magnetic roughing separation by a wet drum-type strong magnetic separator, with a magnetic field strength of 0.8T and a mass percentage concentration of 35% in the slurry, to obtain strong magnetic roughing concentrate and strong magnetic roughing tailings; the strong magnetic roughing tailings are subjected to strong magnetic scavenging separation by a wet drum-type strong magnetic separator, with a magnetic field strength of 0.8T and a mass percentage concentration of 25% in the slurry, to obtain strong magnetic scavenging concentrate and strong magnetic tailings; the strong magnetic roughing concentrate is subjected to strong magnetic concentration by a wet drum-type strong magnetic separator, with a magnetic field strength of 0.6T and a mass percentage concentration of 37% in the slurry, to obtain titanium concentrate and strong magnetic concentration tailings; wherein, the strong magnetic scavenging concentrate and the strong magnetic concentration tailings are combined and returned to the strong magnetic roughing to form a closed-loop operation.

[0052] The results of the above method show that the yield of the gravity separation tailings is 13.58%, the grade of TiO2 is 16.25%, the recovery rate of TiO2 is 50.15%, the grade of S in the sulfur concentrate is 47%, the grade of TiO2 in the desulfurization flotation tailings (i.e., titanium middlings) is 19.33%, the grade of TiO2 in the gravity separation enriched concentrate is 40.21%, the grade of TiO2 in the weak magnetic tailings is 41.18%, and the grade of TiO2 in the titanium concentrate is 46.23%.

[0053] Therefore, the grade of TiO2 in the titanium concentrate obtained by the method provided in this embodiment is 46.23%, which meets the quality requirements.

[0054] Example 2

[0055] This embodiment provides a method for recovering titanium from the iron-separation tailings of high-sphene ilmenite, using the iron-separation tailings of a large domestic vanadium-titanium magnetite mine as raw material. In the iron-separation tailings, the grade of TiO2 is 4.5% to 5.1%, the titanium content in the sphene is 60% to 64%, and the titanium content in the ilmenite is 36% to 40%.

[0056] like Figure 1 As shown, the above method includes:

[0057] S1. Gravity separation and tailings discarding: using a spiral chute to carry out gravity separation and tailings discarding roughing selection on the iron ore tailings to obtain gravity separation and tailings discarding roughing concentrate, gravity separation and tailings discarding roughing medium and gravity separation and tailings discarding roughing tailings; using a spiral chute to carry out gravity separation and tailings discarding scavenging selection on the gravity separation and tailings discarding roughing medium to obtain gravity separation and tailings discarding scavenging concentrate and gravity separation and tailings discarding scavenging tailings; wherein, the gravity separation and tailings discarding roughing concentrate and the gravity separation and tailings discarding scavenging concentrate are combined into the gravity separation and tailings discarding concentrate, and the gravity separation and tailings discarding roughing tailings and the gravity separation and tailings discarding scavenging tailings are combined into the gravity separation and tailings discarding tailings;

[0058] S2. Desulfurization flotation: Desulfurization roughing is performed on the tailings concentrate of gravity separation, and copper sulfate 400g / t·feed, butyl xanthate and isopentyl xanthate 200g / t·feed with 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 55g / 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;

[0059] S3. Gravity selection and enrichment: using a sludge shaking table to perform gravity selection and enrichment roughing on the desulfurized flotation tailings to obtain gravity selection and enrichment roughing concentrate, gravity selection and enrichment roughing mid-point and gravity selection and enrichment roughing tailings; using a sludge shaking table to perform gravity selection and enrichment scavenging on the gravity selection and enrichment roughing mid-point to obtain gravity selection and enrichment scavenging concentrate and gravity selection and enrichment scavenging tailings; wherein, the gravity selection and enrichment roughing concentrate and the gravity selection and enrichment scavenging concentrate are combined into gravity selection and enrichment concentrate; the gravity selection and enrichment roughing tailings are combined into gravity selection and enrichment scavenging tailings;

[0060] S4. Weak magnetic iron removal: Wet permanent magnetic weak magnetic separator is used to remove iron from the re-selected enriched concentrate with a magnetic field strength of 0.20T and a slurry mass percentage concentration of 40% to obtain iron concentrate and weak magnetic tailings;

[0061] S5. Strong magnetic enrichment and recovery: The weak magnetic tailings are subjected to strong magnetic roughing separation by a wet drum-type strong magnetic separator, with a magnetic field strength of 0.7T and a slurry mass percentage concentration of 38%, to obtain strong magnetic roughing concentrate and strong magnetic roughing tailings; the strong magnetic roughing tailings are subjected to strong magnetic scavenging separation by a wet drum-type strong magnetic separator, with a magnetic field strength of 0.8T and a slurry mass percentage concentration of 27%, to obtain strong magnetic scavenging concentrate and strong magnetic tailings; the strong magnetic roughing concentrate is subjected to strong magnetic concentration by a wet drum-type strong magnetic separator, with a magnetic field strength of 0.6T and a slurry mass percentage concentration of 33%, to obtain titanium concentrate and strong magnetic concentration tailings; wherein, the strong magnetic scavenging concentrate and the strong magnetic concentration tailings are combined and returned to the strong magnetic roughing to form a closed-loop operation.

[0062] The results of the above method show that the yield of the gravity separation tailings is 15.41%, the grade of TiO2 is 18.45%, the recovery rate of TiO2 is 56.88%, the grade of S in the sulfur concentrate is 43.24%, the grade of TiO2 in the desulfurization flotation tailings (i.e., titanium middlings) is 20.85%, the grade of TiO2 in the gravity separation enriched concentrate is 41.23%, the grade of TiO2 in the weak magnetic tailings is 42.54%, and the grade of TiO2 in the titanium concentrate is 46.55%.

[0063] Therefore, the grade of TiO2 in the titanium concentrate obtained by the method provided in this embodiment is 46.55%, which meets the quality requirements.

[0064] Comparative Example 1

[0065] Example 1 is compared with reference example 1, wherein the difference between reference example 1 and example 1 is:

[0066] Replace the strong magnetic enrichment recovery of S5 with titanium flotation, including:

[0067] Two cleaning operations were carried out, one roughing operation and one scavenging operation. In the roughing operation, 800g / t of sulfuric acid, 1500g / t of sodium fluorosilicate, 2000g / t of collector MOH and 200g / t of diesel were added in sequence; in the scavenging operation, 200g / t of sulfuric acid, 100g / t of sodium fluorosilicate, 200g / t of collector MOH and 10g / t of diesel were added in sequence; in the two cleaning operations, 200g / t of sulfuric acid and 100g / t of sulfuric acid were added respectively, and the dosage was calculated for the flotation operation.

[0068] 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 strong magnetic enrichment recovery with titanium flotation to prove that the method disclosed in the present invention is more effective).

[0069] The results show that the grade of TiO2 in the titanium concentrate is 45.12%, and the grade of S in the sulfur concentrate is 42.14%. 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 45.12%, which cannot reach the commercial concentrate grade of 46%.

[0070] Comparative Example 2

[0071] Example 1 is compared with reference example 2, wherein the difference between reference example 2 and example 1 is:

[0072] The order of S3 gravity enrichment and S2 desulfurization flotation is exchanged, including:

[0073] The gravity separation tailing concentrate is subjected to gravity separation enrichment and roughing by using a sludge shaking table to obtain gravity separation enrichment roughing concentrate, gravity separation enrichment roughing mid-point and gravity separation enrichment roughing tailing; then, the gravity separation enrichment and scavenging by using a sludge shaking table to obtain gravity separation enrichment and scavenging concentrate and gravity separation enrichment and scavenging tailing; wherein, the gravity separation enrichment roughing concentrate and the gravity separation enrichment and scavenging concentrate are combined into gravity separation enrichment concentrate; and the gravity separation enrichment roughing tailings and the gravity separation enrichment and scavenging tailings are combined into gravity separation enrichment tailings;

[0074] The re-selected concentrated ore was subjected to desulfurization and roughing, and sulfuric acid (1300 g / t·feed ore), butyl xanthate (150 g / 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;

[0075] 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 concentration 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).

[0076] The results show that the grade of TiO2 in the titanium concentrate is 45.32%, and the grade of S in the sulfur concentrate is 42.58%. 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 45.32%, which cannot reach the commercial concentrate grade of 46%.

[0077] In summary, the method for recovering titanium from the iron ore tailings of high-sphene ilmenite provided in the present invention can at least achieve the effective separation between low-titanium minerals such as sphene and high-titanium minerals such as ilmenite, and improve the recovery effect of titanium resources and the grade of the obtained titanium concentrate under the conditions of reducing production costs and secondary pollution caused by chemical agents used in flotation.

[0078] 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 recovering titanium from the iron ore tailings of high-sphene ilmenite, characterized in that: include: Carrying out gravity separation and discarding of the iron ore tailings to obtain gravity separation and discarding of tailings concentrate and gravity separation and discarding of tailings; Carrying out desulfurization flotation on the gravity separation tailings concentrate to obtain sulfur concentrate and desulfurization flotation tailings; Carrying out gravity concentration enrichment on the desulfurized flotation tailings to obtain gravity concentration enriched concentrate and gravity concentration enriched tailings; Performing weak magnetic iron removal on the re-selection enriched concentrate to obtain iron concentrate and weak magnetic tailings; and The weak magnetic tailings are subjected to strong magnetic enrichment and recovery to obtain titanium concentrate and strong magnetic tailings.

2. The method according to claim 1, characterized in that The method of performing gravity separation and tailings discarding on the iron ore tailings to obtain gravity separation and tailings discarding concentrate and gravity separation and tailings discarding comprises: Carrying out gravity separation and tailings discarding roughing separation on the iron ore tailings to obtain gravity separation and tailings discarding roughing concentrate, gravity separation and tailings discarding roughing concentrate and gravity separation and tailings discarding roughing tailings; and The gravity separation tailings roughing ore is subjected to gravity separation tailings scavenging to obtain gravity separation tailings scavenging concentrate and gravity separation tailings scavenging tailings; Among them, the gravity separation tailings discarded rougher concentrate and the gravity separation tailings discarded scavenging concentrate are combined into the gravity separation tailings discarded concentrate, and the gravity separation tailings discarded rougher tailings and the gravity separation tailings discarded scavenging tailings are combined into the gravity separation tailings discarded tailings.

3. The method according to claim 1, characterized in that The method of performing desulfurization flotation on the gravity separation tailings concentrate to obtain sulfur concentrate and desulfurization flotation tailings comprises: Performing desulfurization roughing on the gravity separation tailings 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 method of performing gravity concentration enrichment on the desulfurized flotation tailings to obtain gravity concentration enriched concentrate and gravity concentration enriched tailings comprises: Carrying out gravity enrichment and roughing separation on the desulfurized flotation tailings to obtain gravity enrichment and roughing concentrate, gravity enrichment and roughing mide and gravity enrichment and roughing tailings; and Carrying out gravity-concentration and scavenging on the gravity-concentration and roughing ore to obtain gravity-concentration and scavenging concentrate and gravity-concentration and scavenging tailings; Wherein, the gravity-concentrated enriched rougher concentrate and the gravity-concentrated enriched scavenging concentrate are combined into the gravity-concentrated enriched concentrate; and the gravity-concentrated enriched rougher tailings and the gravity-concentrated enriched scavenging tailings are combined into the gravity-concentrated enriched tailings.

6. The method according to claim 1, characterized in that The method of performing strong magnetic enrichment and recovery on the weak magnetic tailings to obtain titanium concentrate and strong magnetic tailings comprises: Performing strong magnetic roughing on the weak magnetic tailings to obtain strong magnetic roughing concentrate and strong magnetic roughing tailings; Performing strong magnetic sweeping on the strong magnetic rougher tailings to obtain strong magnetic sweeping concentrate and the strong magnetic tailings; and The strong magnetic roughing concentrate is subjected to strong magnetic concentration to obtain the titanium concentrate and strong magnetic concentration tailings.

7. The method according to claim 6, characterized in that The magnetic field strength of the strong magnetic roughing is 0.7-0.8T; And / or, the magnetic field strength of the strong magnetic sweep is 0.7-0.8T; And / or, the magnetic field strength of the strong magnetic selection is 0.6-0.7T.

8. The method according to claim 1, 6 or 7, characterized in that: The mass percentage concentration of the ore pulp recovered by strong magnetic enrichment is 25% to 50%.

9. The method according to claim 1, characterized in that: The magnetic field strength of the weak magnetic iron removal is 0.1-0.3T.

10. The method according to claim 1 or 9, characterized in that: The mass percentage concentration of the ore pulp for weak magnetic iron removal is 25% to 50%.

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