Method for recovering titanium concentrate and zircon sand from recycled reduced ilmenite magnetic separation tailings and its application

Abstract

The present invention relates to the technical field of chemical solid waste treatment. Specifically, it relates to a method for recovering and reducing ilmenite concentrate and zircon sand from ilmenite magnetic separation tailings and its application. The ilmenite magnetic separation tailings are subjected to screening, gravity separation roughing separation, and magnetic separation roughing to obtain magnetic separation roughing concentrate and magnetic separation roughing tailings; the magnetic separation roughing tailings are subjected to the first scavenging to obtain first-stage scavenging concentrate and first-stage scavenging tailings; the first-stage scavenging concentrate is subjected to the first electrostatic separation concentration to obtain first-stage electrostatic separation concentration concentrate and first-stage electrostatic separation concentration tailings; the first-stage scavenging tailings are subjected to the second scavenging to obtain second-stage scavenging concentrate and second-stage scavenging tailings, and the second-stage scavenging concentrate is subjected to the second electrostatic separation concentration to obtain second-stage electrostatic separation concentration concentrate and second-stage electrostatic separation concentration tailings; the second-stage scavenging tailings are subjected to electrostatic separation scavenging to obtain electrostatic separation scavenging concentrate and electrostatic separation scavenging tailings. The above-mentioned concentrates are mixed to obtain ilmenite concentrate; the first-stage electrostatic separation concentration tailings, the second-stage electrostatic separation concentration tailings, and the electrostatic separation scavenging tailings are mixed and subjected to gravity separation concentration to obtain zircon sand. This method can recover ilmenite concentrate and zircon sand.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical solid waste treatment. Specifically, it relates to a method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings and its application. Background Art

[0002] Reduced titanium refers to the product obtained by reducing ilmenite under gas-based or coal-based reduction conditions at high temperature. This is a common method for treating titanium iron minerals, enriching titanium iron, and producing titanium-rich materials. Reduced titanium is usually used as an intermediate product of titanium-rich materials and can be used as a raw material for pyrometallurgy or hydrometallurgy to produce high-titanium slag or rutile titanium-rich materials.

[0003] In addition to high-temperature reduction during the production of reduced titanium, the reduction product also needs to be subjected to magnetic separation to separate the reduced titanium from the unreacted reducing agent and the weakly magnetic substances present in the titanium concentrate. The magnetic separation concentrate obtained from the reduction product magnetic separation is the reduced titanium, and the magnetic separation tailings mainly consist of weakly magnetic titanium concentrate, leucoxene, rutile, zircon sand, quartz, coal-based reducing agent, etc.

[0004] Since the unreacted coal-based reducing agent in the magnetic separation tailings of reduced titanium can be used as activated carbon, in the prior art, the magnetic separation tailings of reduced titanium are directly used as low-quality activated carbon or carbon powder, ignoring the recovery of titanium concentrate and zircon sand therein, resulting in waste of resources.

[0005] In view of this, the present invention is specifically proposed. Summary of the Invention

[0006] The first object of the present invention is to provide a method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings. This method can effectively recover and enrich the titanium concentrate and zircon sand in the reduced titanium magnetic separation tailings while obtaining activated carbon, recycle waste by-products, avoid waste of resources, and increase added value.

[0007] The second object of the present invention is to provide an application of the method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings in the production of titanium-rich materials.

[0008] In order to achieve the above objects of the present invention, the following technical solutions are specifically adopted:

[0009] The present invention provides a method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings, including the following steps:

[0010] (a), the reduced titanium magnetic separation tailings are screened to obtain oversize and undersize materials. The undersize materials are separated by gravity concentration roughing to obtain gravity concentration roughing concentrate and gravity concentration roughing tailings. The gravity concentration roughing tailings are mixed with the oversize materials to obtain activated carbon;

[0011] Among them, the reduced ilmenite magnetic separation tailings include the magnetic separation tailings obtained after the reduction and magnetic separation of ilmenite;

[0012] (b), subjecting the rough concentrate obtained by gravity separation to rough magnetic separation to obtain a rough magnetic separation concentrate and a rough magnetic separation tailings; the rough magnetic separation tailings are subjected to a first scavenging to obtain a first scavenging concentrate and a first scavenging tailings;

[0013] (c), subjecting the first scavenging concentrate obtained in step (b) to a first electrostatic separation beneficiation to obtain a first electrostatic separation beneficiation concentrate and a first electrostatic separation beneficiation tailings;

[0014] (d), subjecting the first scavenging tailings obtained in step (b) to a second scavenging to obtain a second scavenging concentrate and a second scavenging tailings, and the second scavenging concentrate is subjected to a second electrostatic separation beneficiation to obtain a second electrostatic separation beneficiation concentrate and a second electrostatic separation beneficiation tailings;

[0015] (e), subjecting the second scavenging tailings obtained in step (d) to an electrostatic separation scavenging to obtain an electrostatic separation scavenging concentrate and an electrostatic separation scavenging tailings;

[0016] (f), mixing the rough magnetic separation concentrate obtained in step (b), the first electrostatic separation beneficiation concentrate obtained in step (c), the second electrostatic separation beneficiation concentrate obtained in step (d), and the electrostatic separation scavenging concentrate obtained in step (e) to obtain titanium concentrate;

[0017] Mixing the first electrostatic separation beneficiation tailings obtained in step (c), the second electrostatic separation beneficiation tailings obtained in step (d), and the electrostatic separation scavenging tailings obtained in step (e) to obtain rough zircon sand; the rough zircon sand is subjected to gravity separation beneficiation to obtain zircon sand.

[0018] The present invention also provides an application of the method for recovering titanium concentrate and zircon sand from the reduced ilmenite magnetic separation tailings in the production of titanium-rich materials.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) The method for recovering titanium concentrate and zircon sand from the reduced ilmenite magnetic separation tailings provided by the present invention can effectively recover and enrich the titanium concentrate and zircon sand in the reduced ilmenite magnetic separation tailings while separating activated carbon.

[0021] (2) For the method for recovering titanium concentrate and zircon sand from the reduced ilmenite magnetic separation tailings provided by the present invention, the grade of the separated titanium concentrate ≥ 55 wt.%, and the grade of the zircon sand ≥ 50 wt.%.

[0022] (3) The method for recovering titanium concentrate and zircon sand from the reduced ilmenite magnetic separation tailings provided by the present invention further removes impurities in the activated carbon and improves the decolorizing power of the activated carbon. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a process flow diagram of the method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings and specific embodiments. However, those skilled in the art will understand that the following described embodiments are some embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments not specified by the manufacturer are all conventional products that can be obtained through commercial purchase.

[0026] In the first aspect, the present invention provides a method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings. Refer to Figure 1 The following shows a process flow diagram of the method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings provided by the present invention, which specifically includes the following steps:

[0027] (a) After screening the reduced titanium magnetic separation tailings, oversize and undersize materials are obtained. Among them, the oversize refers to the materials remaining on the screen surface or screen mesh, and the undersize refers to the materials passing through the screen surface or screen mesh. The reduced titanium magnetic separation tailings include the magnetic separation tailings obtained after the reduction and magnetic separation of ilmenite.

[0028] After rough separation by gravity separation of the undersize, gravity separation rough concentrate and gravity separation rough tailings are obtained. The gravity separation rough tailings are mixed with the oversize to obtain activated carbon.

[0029] In a preferred embodiment, in the reduced titanium magnetic separation tailings, the grade of titanium concentrate is ≤ 20 wt.%, and the grade of zircon sand is ≤ 5 wt.%.

[0030] (b), subject the reselected rough concentrate obtained in step (a) to rough magnetic separation with a low magnetic field intensity to obtain a rough magnetic separation concentrate and a rough magnetic separation tailing. The rough magnetic separation tailing is subjected to a first scavenging with a medium magnetic field intensity to obtain a first scavenging concentrate and a first scavenging tailing.

[0031] (c), heat the first scavenging concentrate obtained in step (b) and then conduct first electrostatic separation beneficiation to obtain a first electrostatic separation beneficiation concentrate and a first electrostatic separation beneficiation tailing.

[0032] (d), subject the first scavenging tailing obtained in step (b) to a second scavenging to obtain a second scavenging concentrate and a second scavenging tailing. The second scavenging concentrate is subjected to second electrostatic separation beneficiation to obtain a second electrostatic separation beneficiation concentrate and a second electrostatic separation beneficiation tailing.

[0033] (e), subject the second scavenging tailing obtained in step (d) to electrostatic separation scavenging to obtain an electrostatic separation scavenging concentrate and an electrostatic separation scavenging tailing.

[0034] (f), mix the rough magnetic separation concentrate obtained in step (b), the first electrostatic separation beneficiation concentrate obtained in step (c), the second electrostatic separation beneficiation concentrate obtained in step (d), and the electrostatic separation scavenging concentrate obtained in step (e) to obtain titanium concentrate.

[0035] And mix the first electrostatic separation beneficiation tailing obtained in step (c), the second electrostatic separation beneficiation tailing obtained in step (d), and the electrostatic separation scavenging tailing obtained in step (e) to obtain a rough zircon sand ore.

[0036] The rough zircon sand ore is subjected to reselected beneficiation to obtain zircon sand.

[0037] It can be understood that Figure 1 in order to distinguish the merging items of titanium concentrate (the line is marked as a solid line), the merging items of zircon sand are marked as dotted lines.

[0038] The principle of the above method for recovering titanium concentrate and zircon sand from the reduced titanium magnetic separation tailing is as follows:

[0039] The reduced titanium magnetic separation tailings contain activated carbon particles with larger particle sizes and those with smaller particle sizes. The activated carbon particles with larger particle sizes can be separated by a simple screening method. Compared with titanium, zircon, and gangue components, the smaller activated carbon particles have a lighter specific gravity and can enter the tailings through gravity separation to achieve effective separation. The coarse and fine activated carbon particles are combined to obtain high-quality activated carbon. The titanium concentrate that was not separated at low magnetic field strength in the reduced titanium magnetic separation tailings is separated by rough magnetic separation. In the subsequent first scavenging process, the magnetic field strength is increased, and the weakly magnetic leucoxene in the reduced titanium magnetic separation tailings is separated. However, due to the increase in the magnetic field strength, the probability of zircon sand and gangue entering the leucoxene increases. Therefore, the concentrate from the first scavenging needs to be separated by the first electrostatic separation. According to the principle that zircon sand and gangue are non-conductive, the concentrate obtained after the first electrostatic separation of the concentrate from the first scavenging is high-quality titanium concentrate after impurity removal, and the main components of the tailings from the first electrostatic separation include zircon sand and gangue. The main components of the tailings from the first scavenging include rutile, zircon sand, and gangue. Rutile can be separated by electrostatic separation due to the difference in conductivity. Finally, the titanium concentrate, leucoxene, and rutile are combined to obtain high-grade titanium concentrate. After the electrostatic separation tailings are combined, the gangue can be effectively removed by gravity separation according to the difference in specific gravity between zircon sand and gangue to obtain high-grade zircon sand.

[0040] The method for recovering titanium concentrate and zircon sand from the reduced titanium magnetic separation tailings provided by the present invention screens and performs rough gravity separation on the reduced titanium magnetic separation tailings to obtain relatively coarse and light carbon particles, and separates the titanium concentrate and zircon sand by a step-by-step magnetic separation - electrostatic separation method. The impurities in the zircon sand are removed by gravity separation, and finally, titanium concentrate and zircon sand can be recovered.

[0041] Moreover, the present invention gradually recovers titanium concentrate according to the different magnetisms of titanium concentrate, leucoxene, and rutile, separates rutile from zircon sand according to the different electrical conductivities of rutile, zircon sand, and gangue, and removes impurities from zircon sand according to the different specific gravities of gangue and zircon sand, thereby improving the overall recovery rates of titanium concentrate and zircon sand.

[0042] Furthermore, while recovering titanium concentrate and zircon sand from the reduced titanium magnetic separation tailings, the method further removes impurities in the activated carbon, and the decolorizing power of the obtained activated carbon is further improved.

[0043] In addition, the method also has the advantages of simple process, conventional equipment used, and easy realization of batch production.

[0044] In a preferred embodiment, the grade of the titanium concentrate obtained in step (f) is ≥ 55 wt.%, including but not limited to any point value among 58 wt.%, 60 wt.%, 63 wt.%, 65 wt.%, 67 wt.%, 70 wt.% or the range value between any two of them; more preferably ≥ 58 wt.%.

[0045] In a preferred embodiment, the grade of the zircon sand obtained in step (f) is ≥ 50 wt.%, including but not limited to any point value among 50 wt.%, 53 wt.%, 55 wt.%, 58 wt.%, 60 wt.%, 63 wt.%, 65 wt.%, 68 wt.%, 70 wt.% or the range value between any two of them; more preferably ≥ 55 wt.%.

[0046] The above grade refers to the content ratio (mass fraction) of the oxides of useful elements in the ore. Specifically, the grade of the titanium concentrate refers to the mass percentage of titanium dioxide in the titanium concentrate. The grade of the zircon sand refers to the mass percentage of zircon dioxide in the zircon sand.

[0047] In order to further improve the overall recovery rates of the titanium concentrate and the zircon sand, the present invention optimizes the process parameters of the processes such as screening, gravity separation rough separation, magnetic separation roughing, first scavenging, first electrostatic separation beneficiation, second scavenging, second electrostatic separation beneficiation, electrostatic separation scavenging, and gravity separation beneficiation as follows.

[0048] In a preferred embodiment, in step (a), the mesh number of the screen used for screening is 20 - 60 meshes, including but not limited to any point value among 30 meshes, 40 meshes, 50 meshes or the range value between any two of them.

[0049] In a preferred embodiment, in step (a), after the screen undersize is mixed with water to form a pulp, the gravity separation rough separation is carried out, and the mass fraction of the pulp is 25% - 40%; including but not limited to any point value among 27%, 30%, 32%, 35%, 38% or the range value between any two of them.

[0050] In a preferred embodiment, in step (a), the stroke of the gravity separation rough separation is 10 - 20 mm, including but not limited to any point value among 12 mm, 14 mm, 15 mm, 18 mm or the range value between any two of them; the stroke frequency of the gravity separation rough separation is 150 - 250 times / min, including but not limited to any point value among 170 times / min, 190 times / min, 200 times / min, 220 times / min, 240 times / min or the range value between any two of them.

[0051] In a preferred embodiment, the gravity rough separation can be carried out in any conventional gravity separation equipment, such as including shaking tables and spiral launders, but not limited thereto.

[0052] In a preferred embodiment, before the gravity roughing tailings are mixed with the oversize, the gravity roughing tailings are filtered and dried under pressure, and then mixed with the oversize to obtain activated carbon.

[0053] In a preferred embodiment, the gravity roughing concentrate is filtered and dried under pressure before the magnetic roughing.

[0054] In a preferred embodiment, in step (b), the magnetic field intensity of the magnetic roughing is 3000 - 5000 GS; including but not limited to the point value of any one of 3300 GS, 3500 GS, 3800 GS, 4000 GS, 4200 GS, 4500 GS, 4800 GS or the range value between any two of them.

[0055] In a preferred embodiment, in step (b), the magnetic field intensity of the first scavenging is 5000 - 7000 GS, including but not limited to the point value of any one of 5300 GS, 5500 GS, 5800 GS, 6000 GS, 6200 GS, 6500 GS, 6800 GS or the range value between any two of them.

[0056] In a preferred embodiment, in step (c), the electrostatic separation voltage of the first electrostatic separation for cleaning is 18000 - 22000 V, including but not limited to the point value of any one of 19000 V, 20000 V, 21000 V or the range value between any two of them.

[0057] In a preferred embodiment, in step (d), the magnetic field intensity of the second scavenging is 7000 - 9000 GS; including but not limited to the point value of any one of 7300 GS, 7500 GS, 7800 GS, 8000 GS, 8300 GS, 8500 GS, 8800 GS or the range value between any two of them.

[0058] In a preferred embodiment, in step (d), the electrostatic separation voltage of the second electrostatic separation for cleaning is 18000 - 22000 V, including but not limited to the point value of any one of 19000 V, 20000 V, 21000 V or the range value between any two of them.

[0059] In a preferred embodiment, in step (e), the electrostatic separation voltage of the electrostatic scavenging is 18000 - 22000 V, including but not limited to the point value of any one of 19000 V, 20000 V, 21000 V or the range value between any two of them.

[0060] In a preferred embodiment, in step (f), after the zircon sand concentrate is mixed with water to form a pulp, the gravity separation and concentration are carried out, and the mass fraction of the pulp is 25% to 40%; including but not limited to any point value among 27%, 30%, 32%, 35%, 38% or the range value between any two of them.

[0061] In a preferred embodiment, in step (f), the stroke of the gravity separation and concentration is 20 to 30 mm, including but not limited to any point value among 22 mm, 24 mm, 25 mm, 28 mm or the range value between any two of them; the stroke frequency of the rough gravity separation is 250 to 350 times / min, including but not limited to any point value among 270 times / min, 290 times / min, 300 times / min, 320 times / min, 340 times / min or the range value between any two of them.

[0062] In a preferred embodiment, in step (f), the gravity separation and concentration can be carried out in any conventional gravity separation equipment, such as including but not limited to shaking tables and spiral chutes.

[0063] In a preferred embodiment, the decolorizing power (methylene blue adsorption value) of the activated carbon obtained by the method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings of the present invention is ≥ 200 mg / g, including but not limited to any point value among 210 mg / g, 220 mg / g, 230 mg / g, 240 mg / g, 250 mg / g or the range value between any two of them.

[0064] In a second aspect, the present invention also provides an application of the method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings in the production of titanium-rich materials.

[0065] During the production of titanium-rich materials, after obtaining the reduced ilmenite magnetic separation tailings, the ilmenite concentrate and zircon sand in the reduced ilmenite magnetic separation tailings are recovered by the above method. The separated ilmenite concentrate can be used for the production of high-titanium slag, titanium dioxide, acid slag, titanium tetrachloride, sponge titanium, etc., and the separated zircon sand can be used for the production of refractory materials, sand for industrial casting molds, ceramic and enamel utensils, glass, zircon compounds, ferroalloys, medicine, paint and abrasives, as well as leather making, etc.

[0066] At the same time, the activated carbon separated by the above method can be used for air purification, sewage treatment, decolorization, conditioning soil properties and vegetable preservation, etc., and has better adsorption capacity.

[0067] The embodiments of the present invention will be described in detail below in conjunction with the examples. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be regarded as limiting the scope of the present invention. For those not specified in the examples, the operations are carried out under conventional conditions or conditions recommended by the manufacturer. All reagents or instruments not specified by the manufacturer can be obtained as conventional products through commercial purchase.

[0068] The reduced ilmenite magnetic separation tailings used in the following examples and comparative examples of the present invention are the magnetic separation tailings (the same batch) obtained after the reduction and magnetic separation of ilmenite. In this reduced ilmenite magnetic separation tailings, the grade of titanium concentrate is 18.35 wt.%, the grade of zircon sand is 2.22 wt.%, the mass fraction of activated carbon in the reduced ilmenite magnetic separation tailings is 47.03 wt.%, and the decolorizing power (i.e., methylene blue adsorption value) of the reduced ilmenite magnetic separation tailings is 120 mg / g.

[0069] In the present invention, the decolorizing power test is the methylene blue adsorption value, and the test method is as follows: Prepare a methylene blue solution with a mass concentration of 1.5 g / L for standby. Grind the sample to be tested so that more than 90% can pass through a 0.045 mm test sieve. Mix the sieved residue with it and dry it in an electric thermostatic drying oven at 150 °C for 2 h, then cool it in a desiccator for standby. Weigh 0.1 g ± 0.0004 g of the sample to be tested and place it in a 100 mL conical flask. Add 5 mL - 15 mL of methylene blue solution dropwise with a dropper, plug the bottle stopper tightly, and shake it on an oscillator for 30 min; Filter the methylene blue solution adsorbed by the above sample to be tested into a colorimetric tube and mix well; Use a 10 mL colorimetric cell at a wavelength of 665 nm, with water as the reference solution, to measure the absorbance value of the filtrate. The absorbance value of this filtrate should have a difference within ±0.020 from the absorbance reading of the copper sulfate standard solution; If it exceeds the above range, the number of milliliters of methylene blue solution added should be adjusted, and the above operations should be repeated until the requirements are met. Then the methylene blue adsorption value E is in the unit of (mg / g), and the calculation method is as follows: E = cV / m, where c is the numerical value of the methylene blue solution concentration, in the unit of milligrams per milliliter (mg / mL); V is the numerical value of the volume of methylene blue solution consumed for measuring the sample, in the unit of mL; m is the numerical value of the sample mass, in the unit of grams (g).

[0070] Example 1

[0071] The method for recovering titanium concentrate and zircon sand from the reduced ilmenite magnetic separation tailings provided in this example includes the following steps:

[0072] (1) Screen the reduced titanium magnetic separation tailings through a 40-mesh sieve to obtain oversize and undersize materials. Mix the undersize materials with water to make a pulp with a mass fraction of 30%, and subject this pulp to rough gravity separation using a shaking table. The stroke for rough gravity separation is 12 mm and the stroke frequency is 200 times / min to obtain rough gravity separation concentrate and rough gravity separation tailings. The rough gravity separation tailings are filtered and dried and then mixed with the oversize materials to obtain activated carbon.

[0073] (2) Subject the rough magnetic separation concentrate obtained in step (1) to rough magnetic separation at a magnetic field intensity of 4000 GS to obtain rough magnetic separation concentrate and rough magnetic separation tailings, and subject the rough magnetic separation tailings to the first scavenging at a magnetic field intensity of 6000 GS to obtain first scavenging concentrate and first scavenging tailings.

[0074] (3) Heat the first scavenging concentrate obtained in step (2) to 150 °C and conduct the first electrostatic separation beneficiation at an electrostatic separation voltage of 20000 V to obtain first electrostatic separation beneficiation concentrate and first electrostatic separation beneficiation tailings.

[0075] (4) Subject the first scavenging tailings obtained in step (2) to the second scavenging at a magnetic field intensity of 8000 GS to obtain second scavenging concentrate and second scavenging tailings; then conduct the second electrostatic separation beneficiation on the second scavenging concentrate at an electrostatic separation voltage of 20000 V to obtain second electrostatic separation beneficiation concentrate and second electrostatic separation beneficiation tailings; mix the second electrostatic separation beneficiation concentrate, the rough magnetic separation concentrate obtained in step (2), and the first electrostatic separation beneficiation concentrate obtained in step (3) to obtain titanium concentrate.

[0076] (5) Subject the second scavenging tailings obtained in step (4) to electrostatic separation scavenging at an electrostatic separation voltage of 20000 V to obtain electrostatic separation scavenging concentrate and electrostatic separation scavenging tailings.

[0077] (6) Mix the rough magnetic separation concentrate obtained in step (2), the first electrostatic separation beneficiation concentrate obtained in step (3), the second electrostatic separation beneficiation concentrate obtained in step (4), and the electrostatic separation scavenging concentrate obtained in step (5) to obtain titanium concentrate.

[0078] Mix the electrostatic separation scavenging tailings obtained in step (5), the first electrostatic separation beneficiation tailings obtained in step (3), and the second electrostatic separation beneficiation tailings obtained in step (4) to obtain zircon sand rough ore. Mix this zircon sand rough ore with water to make a pulp with a mass fraction of 30%, and then use a shaking table to conduct gravity separation beneficiation on this pulp. The stroke for gravity separation beneficiation is 20 mm and the stroke frequency is 350 times / min to obtain gravity separation beneficiation concentrate, which is then filtered and dried to obtain zircon sand.

[0079] Example 2

[0080] The method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings provided in this example includes the following steps:

[0081] (1) Screen the reduced titanium magnetic separation tailings through a 40-mesh sieve to obtain oversize and undersize materials. Mix the undersize materials with water to make a pulp with a mass fraction of 25%, and subject this pulp to rough gravity separation using a shaking table. The stroke for rough gravity separation is 10 mm and the stroke frequency is 150 times / min to obtain rough gravity separation concentrate and rough gravity separation tailings. The rough gravity separation tailings are filtered and dried and then mixed with the oversize materials to obtain activated carbon.

[0082] (2) Subject the rough magnetic separation concentrate obtained in step (1) to rough magnetic separation at a magnetic field intensity of 3000 GS to obtain rough magnetic separation concentrate and rough magnetic separation tailings, and subject the rough magnetic separation tailings to the first scavenging at a magnetic field intensity of 5000 GS to obtain first scavenging concentrate and first scavenging tailings.

[0083] (3) Heat the first scavenging concentrate obtained in step (2) to 150 °C and perform the first electrostatic separation beneficiation at an electrostatic separation voltage of 20000 V to obtain first electrostatic separation beneficiation concentrate and first electrostatic separation beneficiation tailings.

[0084] (4) Subject the first scavenging tailings obtained in step (2) to the second scavenging at a magnetic field intensity of 7500 GS to obtain second scavenging concentrate and second scavenging tailings; then subject the second scavenging concentrate to the second electrostatic separation beneficiation at an electrostatic separation voltage of 19000 V to obtain second electrostatic separation beneficiation concentrate and second electrostatic separation beneficiation tailings; mix the second electrostatic separation beneficiation concentrate, the rough magnetic separation concentrate obtained in step (2), and the first electrostatic separation beneficiation concentrate obtained in step (3) to obtain titanium concentrate.

[0085] (5) Subject the second scavenging tailings obtained in step (4) to electrostatic separation scavenging at an electrostatic separation voltage of 20000 V to obtain electrostatic separation scavenging concentrate and electrostatic separation scavenging tailings.

[0086] (6) Mix the rough magnetic separation concentrate obtained in step (2), the first electrostatic separation beneficiation concentrate obtained in step (3), the second electrostatic separation beneficiation concentrate obtained in step (4), and the electrostatic separation scavenging concentrate obtained in step (5) to obtain titanium concentrate.

[0087] Mix the electrostatic separation scavenging tailings obtained in step (5), the first electrostatic separation beneficiation tailings obtained in step (3), and the second electrostatic separation beneficiation tailings obtained in step (4) to obtain zircon sand rough concentrate. Mix this zircon sand rough concentrate with water to make a pulp with a mass fraction of 25%, and then use a shaking table to perform gravity separation beneficiation on this pulp. The stroke for gravity separation beneficiation is 25 mm and the stroke frequency is 250 times / min to obtain gravity separation beneficiation concentrate, and after filtering and drying, zircon sand is obtained.

[0088] Example 3

[0089] The method for recovering and reducing titanium concentrate and zircon sand from reduced titanium magnetic separation tailings provided in this embodiment includes the following steps:

[0090] (1) Screen the reduced titanium magnetic separation tailings through a 40-mesh sieve to obtain oversize and undersize materials. Mix the undersize materials with water to make a pulp with a mass fraction of 35%, and conduct rough gravity separation of the pulp using a shaking table. The stroke of the rough gravity separation is 15 mm and the stroke frequency is 220 times / min to obtain rough gravity separation concentrate and rough gravity separation tailings. The rough gravity separation tailings are filtered and dried and then mixed with the oversize materials to obtain activated carbon.

[0091] (2) Conduct rough magnetic separation on the rough gravity separation concentrate obtained in step (1) under a magnetic field intensity of 5000 GS to obtain rough magnetic separation concentrate and rough magnetic separation tailings, and conduct the first scavenging on the rough magnetic separation tailings under a magnetic field intensity of 7000 GS to obtain first scavenging concentrate and first scavenging tailings.

[0092] (3) Heat the first scavenging concentrate obtained in step (2) to 150 °C and conduct first electrostatic separation concentration. The electrostatic separation voltage is 21000 V to obtain first electrostatic separation concentration concentrate and first electrostatic separation concentration tailings.

[0093] (4) Conduct the second scavenging on the first scavenging tailings obtained in step (2) under a magnetic field intensity of 8000 GS to obtain second scavenging concentrate and second scavenging tailings; then conduct second electrostatic separation concentration on the second scavenging concentrate. The electrostatic separation voltage is 21000 V to obtain second electrostatic separation concentration concentrate and second electrostatic separation concentration tailings; mix the second electrostatic separation concentration concentrate, the rough magnetic separation concentrate obtained in step (2), and the first electrostatic separation concentration concentrate obtained in step (3) to obtain titanium concentrate.

[0094] (5) Conduct electrostatic separation scavenging on the second scavenging tailings obtained in step (4). The electrostatic separation voltage is 19000 V to obtain electrostatic separation scavenging concentrate and electrostatic separation scavenging tailings.

[0095] (6) Mix the rough magnetic separation concentrate obtained in step (2), the first electrostatic separation concentration concentrate obtained in step (3), the second electrostatic separation concentration concentrate obtained in step (4), and the electrostatic separation scavenging concentrate obtained in step (5) to obtain titanium concentrate.

[0096] Mix the electrostatic separation scavenging tailings obtained in step (5), the first electrostatic separation concentration tailings obtained in step (3), and the second electrostatic separation concentration tailings obtained in step (4) to obtain rough zircon sand ore. Mix the rough zircon sand ore with water to make a pulp with a mass fraction of 35%, and then use a shaking table to conduct fine gravity separation on the pulp. The stroke of the fine gravity separation is 30 mm and the stroke frequency is 350 times / min to obtain fine gravity separation concentrate, which is then filtered and dried to obtain zircon sand.

[0097] Example 4

[0098] The method for recovering and reducing ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings provided by this embodiment includes the following steps:

[0099] (1) Screen the reduced ilmenite magnetic separation tailings through a 50-mesh sieve to obtain oversize and undersize materials. Mix the undersize materials with water to make a pulp with a mass fraction of 40%, and perform rough gravity separation of the pulp using a shaking table. The stroke of the rough gravity separation is 20 mm and the stroke frequency is 250 times / min to obtain rough gravity separation concentrate and rough gravity separation tailings. The rough gravity separation tailings are filtered and dried under pressure and then mixed with the oversize materials to obtain activated carbon.

[0100] (2) Perform rough magnetic separation on the rough gravity separation concentrate obtained in step (1) under a magnetic field intensity of 4500 GS to obtain rough magnetic separation concentrate and rough magnetic separation tailings, and perform the first scavenging on the rough magnetic separation tailings under a magnetic field intensity of 6500 GS to obtain first scavenging concentrate and first scavenging tailings.

[0101] (3) Heat the first scavenging concentrate obtained in step (2) to 150 °C and perform first electrostatic separation concentration with an electrostatic separation voltage of 22000 V to obtain first electrostatic separation concentration concentrate and first electrostatic separation concentration tailings.

[0102] (4) Perform the second scavenging on the first scavenging tailings obtained in step (2) under a magnetic field intensity of 9000 GS to obtain second scavenging concentrate and second scavenging tailings; then perform second electrostatic separation concentration on the second scavenging concentrate with an electrostatic separation voltage of 22000 V to obtain second electrostatic separation concentration concentrate and second electrostatic separation concentration tailings; mix the second electrostatic separation concentration concentrate, the rough magnetic separation concentrate obtained in step (2), and the first electrostatic separation concentration concentrate obtained in step (3) to obtain ilmenite concentrate.

[0103] (5) Perform electrostatic separation scavenging on the second scavenging tailings obtained in step (4) with an electrostatic separation voltage of 22000 V to obtain electrostatic separation scavenging concentrate and electrostatic separation scavenging tailings.

[0104] (6) Mix the rough magnetic separation concentrate obtained in step (2), the first electrostatic separation concentration concentrate obtained in step (3), the second electrostatic separation concentration concentrate obtained in step (4), and the electrostatic separation scavenging concentrate obtained in step (5) to obtain ilmenite concentrate.

[0105] Mix the electrostatic separation scavenging tailings obtained in step (5), the first electrostatic separation concentration tailings obtained in step (3), and the second electrostatic separation concentration tailings obtained in step (4) to obtain zircon sand rough ore. Mix the zircon sand rough ore with water to make a pulp with a mass fraction of 40%, and then perform fine gravity separation on the pulp using a shaking table. The stroke of the fine gravity separation is 25 mm and the stroke frequency is 300 times / min to obtain fine gravity separation concentrate, which is then filtered and dried under pressure to obtain zircon sand.

[0106] Example 5

[0107] The method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings provided in this example is basically the same as that in Example 1, except that in step (2), the magnetic field intensity of rough magnetic separation is replaced with 3500 GS, and the magnetic field intensity of the first scavenging is replaced with 5500 GS.

[0108] Example 6

[0109] The method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings provided in this example is basically the same as that in Example 1, except that in step (3), the electrostatic separation voltage of the first electrostatic separation concentration is replaced with 18000 V, and in step (5), the electrostatic separation voltage of the electrostatic separation scavenging is replaced with 18000 V.

[0110] Example 7

[0111] The method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings provided in this example is basically the same as that in Example 1, except that in step (4), the magnetic field intensity of the second scavenging is replaced with 7000 GS; and the electrostatic separation voltage of the second electrostatic separation concentration is replaced with 18000 V.

[0112] Comparative Example 1

[0113] The method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings provided in this comparative example is basically the same as that in Example 1, except that in step (2), the magnetic field intensity of rough magnetic separation is replaced with 2000 GS.

[0114] Comparative Example 2

[0115] The method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings provided in this comparative example is basically the same as that in Example 1, except that in step (3), the electrostatic separation voltage of the first electrostatic separation concentration is replaced with 15000 V.

[0116] Comparative Example 3

[0117] The method for recovering ilmenite concentrate and zircon sand from reduced ilmenite magnetic separation tailings provided in this comparative example is basically the same as that in Example 1, except that in step (4), the magnetic field intensity of the second scavenging is replaced with 5000 GS.

[0118] Experimental Example

[0119] The grades of ilmenite concentrate (mass percentage of titanium dioxide in ilmenite concentrate) and zircon sand (mass percentage of zirconium dioxide in zircon sand) separated in each of the above examples and comparative examples were measured respectively, and the results are shown in Table 1 below.

[0120] The decolorizing power of the activated carbon separated from each example and each comparative example was tested respectively, and the methylene blue adsorption values are shown in Table 1 below.

[0121] Table 1 Results of titanium concentrate grade, zircon sand grade and activated carbon decolorizing power

[0122]

[0123]

[0124] As can be seen from Table 1, the grade of the titanium concentrate separated from each example of the present invention is ≥ 55 wt.%, and the grade of the zircon sand is ≥ 50 wt.%. The grades of the titanium concentrate and zircon sand in each comparative example are lower than those in Example 1. It can be seen that by optimizing process parameters such as magnetic separation roughing, first electrostatic separation concentration, and second scavenging, the overall recovery rates of titanium concentrate and zircon sand can be further improved.

[0125] Moreover, by comparing the decolorizing power of the reduced titanium magnetic separation tailings before separation with that of the obtained activated carbon after separation, it can be known that the method for recovering titanium concentrate and zircon sand from reduced titanium magnetic separation tailings provided by the present invention can further remove impurities in the activated carbon, thereby improving its adsorption capacity.

[0126] Although the present invention has been illustrated and described with reference to specific embodiments, it should be realized that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; those of ordinary skill in the art should understand that: without departing from the spirit and scope of the present invention, the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such replacements and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A method for recovering titanium concentrate and zircon sand from recycled reduced ilmenite magnetic separation tailings, characterized in that, It includes the following steps: (a) After screening the reduced ilmenite tailings, oversize and undersize materials are obtained. The undersize materials are separated by rough gravity separation to obtain rough gravity separation concentrate and rough gravity separation tailings. The rough gravity separation tailings are mixed with the oversize materials to obtain activated carbon; Among them, the reduced ilmenite tailings include the magnetic separation tailings obtained after reduction and magnetic separation of ilmenite; (b) The rough gravity separation concentrate is subjected to rough magnetic separation to obtain rough magnetic separation concentrate and rough magnetic separation tailings; The rough magnetic separation tailings are subjected to the first scavenging to obtain first scavenging concentrate and first scavenging tailings; (c) The first scavenging concentrate obtained in step (b) is subjected to the first electrostatic separation and concentration to obtain first electrostatic separation concentrate and first electrostatic separation tailings; (d) The first scavenging tailings obtained in step (b) are subjected to the second scavenging to obtain second scavenging concentrate and second scavenging tailings. The second scavenging concentrate is subjected to the second electrostatic separation and concentration to obtain second electrostatic separation concentrate and second electrostatic separation tailings; (e) The second scavenging tailings obtained in step (d) are subjected to electrostatic scavenging to obtain electrostatic scavenging concentrate and electrostatic scavenging tailings; (f) The rough magnetic separation concentrate obtained in step (b), the first electrostatic separation concentrate obtained in step (c), the second electrostatic separation concentrate obtained in step (d), and the electrostatic scavenging concentrate obtained in step (e) are mixed to obtain titanium concentrate; The first electrostatic separation tailings obtained in step (c), the second electrostatic separation tailings obtained in step (d), and the electrostatic scavenging tailings obtained in step (e) are mixed to obtain zircon sand rough ore; The zircon sand rough ore is subjected to gravity separation and concentration to obtain zircon sand.

2. The method for recovering ilmenite concentrate and zircon sand from recycled reduced ilmenite magnetic separation tailings according to claim 1, characterized in that, In step (a), the mesh number of the screen used for screening is 20 - 60 meshes.

3. The method for recovering titanium concentrate and zircon sand from recycled reduced ilmenite magnetic separation tailings according to claim 1, wherein, In step (a), the undersize materials are mixed with water to form a pulp, and then the rough gravity separation is carried out. The mass fraction of the pulp is 25% - 40%; And / or, in step (a), the stroke of the rough gravity separation is 10 - 20 mm, and the stroke frequency of the rough gravity separation is 150 - 250 times / min.

4. The method for recovering and reducing ilmenite concentrate and zircon sand from titanium magnetic separation tailings according to claim 1, characterized in that, In step (b), the magnetic field intensity of the rough magnetic separation is 3000 - 5000 GS; And / or, in step (b), the magnetic field intensity of the first scavenging is 5000 - 7000 GS.

5. The method for recovering and reducing ilmenite concentrate and zircon sand from titanium magnetic separation tailings according to claim 1, wherein In step (c), the electrostatic separation voltage of the first electrostatic separation and concentration is 18000 - 22000 V.

6. The method for recovering and reducing ilmenite concentrate and zircon sand from ilmenite magnetic separation tailings according to claim 1, characterized in that, In step (d), the magnetic field intensity of the second scavenging is 7000 - 9000 GS; And / or, in step (d), the electrostatic separation voltage of the second electrostatic separation and concentration is 18000 - 22000 V.

7. The method for recovering and reducing titanium concentrate and zircon sand from titanium magnetic separation tailings according to claim 1, wherein In step (e), the electrostatic separation voltage of the electrostatic scavenging is 18000 - 22000 V.

8. The method for recovering titanium concentrate and zircon sand from recycled reduced ilmenite magnetic separation tailings according to claim 1, characterized in that, In step (f), the zircon sand rough ore is mixed with water to form a pulp, and then the gravity separation and concentration are carried out. The mass fraction of the pulp is 25% - 40%; And / or, in step (f), the stroke of the gravity separation and concentration is 20 - 30 mm, and the stroke frequency of the rough gravity separation is 250 - 350 times / min.

9. The method for recovering and reducing titanium concentrate and zircon sand from titanium magnetic separation tailings according to claim 1, characterized in that, The grade of the titanium concentrate obtained in step (f) ≥ 55 wt.%; And / or, the grade of the zircon sand obtained in step (f) ≥ 50 wt.%.

10. Application of the method for recovering titanium concentrate and zircon sand from reduced titanomagnetite tailings according to any one of claims 1 to 9 in the production of titanium-rich materials.

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