A method for recovering titanium concentrate from beach placer mud and its application

Abstract

The present invention relates to the field of ore dressing, and specifically, to a method for recovering titanium concentrate from beach placer slime and its application. The pulp is subjected to rough wet magnetic separation to obtain wet magnetic rough concentrate and wet magnetic rough tailings; the wet magnetic rough tailings are subjected to scavenging wet magnetic separation to obtain wet magnetic scavenging concentrate and wet magnetic scavenging tailings; the wet magnetic scavenging tailings are subjected to the first gravity scavenging to obtain the first gravity scavenging concentrate and the first gravity scavenging tailings; the first gravity scavenging tailings are subjected to the second gravity scavenging to obtain the second gravity scavenging concentrate; the first gravity scavenging concentrate and the second gravity scavenging concentrate are combined for gravity concentration to obtain gravity concentration concentrate and gravity concentration tailings; the wet magnetic rough concentrate is subjected to cleaning wet magnetic separation to obtain wet magnetic cleaning concentrate and wet magnetic cleaning tailings; the wet magnetic cleaning tailings and the wet magnetic scavenging concentrate are combined for the third gravity scavenging to obtain the third gravity scavenging concentrate; the third gravity scavenging concentrate, the gravity concentration concentrate and the wet magnetic cleaning concentrate are mixed to obtain titanium concentrate. The titanium concentrate obtained by this method has a grade of ≥ 55%.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing waste treatment, and in particular to a method for recovering titanium concentrate from seaside sand ore and its application. Background Art

[0002] Seaside sand ore is a key source of titanium concentrate. Its high degree of weathering makes it easy to mine and sort, making it a high-quality upstream raw material for titanium-related products. However, due to its high silicon content, seaside sand ore typically requires screening and desludging before heavy mineral sand separation. Screening primarily removes foreign matter such as rocks and branches, while desludging primarily removes impurities such as fine-grained quartz.

[0003] The main purpose of desludging is to reduce the impurity content and separate fine-grained minerals to facilitate the next step of mineral sorting. The removed mud and sand are usually piled up as waste or landfilled, resulting in a waste of resources. In seaside sand mines, which are usually titanium-based, the main phases in the mud and sand are quartz, as well as fine-grained ilmenite, leucoxene, rutile, etc. Compared with the main body of seaside sand mines, rutile accounts for a high proportion of titanium-containing minerals, while ilmenite and leucoxene account for a low proportion. Due to the non-magnetic physical property of rutile, it is impossible to effectively separate the seaside sand mud and sand using only the commonly used magnetic separation method; at the same time, its particle size is fine, making sorting more difficult.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The first purpose of the present invention is to provide a method for recovering titanium concentrate from seaside sand ore mud. The method can recover ilmenite, leucoxene and rutile in the waste mud. The obtained titanium concentrate has a grade of more than 55% and a titanium yield of more than 65%.

[0006] The second object of the present invention is to provide a method for recovering titanium concentrate from seaside sand ore and its application in mineral processing.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0008] The present invention provides a method for recovering titanium concentrate from seaside sand ore, comprising the following steps:

[0009] (a) mixing mud and sand produced after desludging of seaside sand ore with water to form a slurry, and subjecting the slurry to wet magnetic roughing to obtain wet magnetic roughing concentrate and wet magnetic roughing tailings;

[0010] (b), subject the wet magnetic roughing tailings obtained in step (a) to wet magnetic scavenging to obtain wet magnetic scavenging concentrate and wet magnetic scavenging tailings; after subjecting the wet magnetic scavenging tailings to the first gravity scavenging, obtain the first gravity scavenging concentrate and the first gravity scavenging tailings; after subjecting the first gravity scavenging tailings to the second gravity scavenging, obtain the second gravity scavenging concentrate and the second gravity scavenging tailings; mix the first gravity scavenging concentrate and the second gravity scavenging concentrate and perform gravity cleaning to obtain gravity cleaning concentrate and gravity cleaning tailings;

[0011] (c), subject the wet magnetic roughing concentrate obtained in step (a) to wet magnetic cleaning to obtain wet magnetic cleaning concentrate and wet magnetic cleaning tailings;

[0012] (d), mix the wet magnetic cleaning tailings obtained in step (c) and the wet magnetic scavenging concentrate obtained in step (b) and perform the third gravity scavenging to obtain the third gravity scavenging concentrate and the third gravity scavenging tailings; mix the third gravity scavenging concentrate, the gravity cleaning concentrate obtained in step (b), and the wet magnetic cleaning concentrate obtained in step (c) to obtain titanium concentrate.

[0013] The present invention also provides an application of the above method for recovering titanium concentrate from beach placer muck in mineral processing.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) The method for recovering titanium concentrate from beach placer muck provided by the present invention can enrich and extract ilmenite, leucoxene, and rutile in the muck according to their respective properties by de-sludging the beach placer, and can recover titanium dioxide in the muck to the greatest extent. The grade of the obtained titanium concentrate is above 55%, and the titanium recovery rate is above 65%.

[0016] (2) The method for recovering titanium concentrate from beach placer muck provided by the present invention adopts the methods of high-gradient magnetic field intensity, medium magnetic field intensity, and repeated gravity separation according to the different magnetisms of ilmenite, leucoxene, and rutile, and separates the three from impurities such as silica in the muck to the greatest extent, while improving the titanium grade and ensuring the titanium recovery rate.

[0017] (3) The method for recovering titanium concentrate from beach placer muck provided by the present invention utilizes the relatively fine characteristics of the muck itself, and adopts wet separation means throughout the process, only requiring one-time pressure filtration and drying, which saves energy while ensuring the maximum titanium recovery rate. Description of the Drawings

[0018] 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 work, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a process flow diagram of the method for recovering ilmenite from the mud and sand of beach placer. Specific Embodiments

[0020] 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, not all embodiments. They 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 work belong to the scope of protection of the present invention. For those conditions not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified for the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0021] In the first aspect, the present invention provides a method for recovering ilmenite from the mud and sand produced after de-sludging beach placer. Refer to Figure 1 as shown, which specifically includes the following steps:

[0022] (a) Mix the mud and sand produced after de-sludging beach placer with water to form a pulp, and conduct rough wet magnetic separation on the pulp to obtain wet magnetic rough concentrate and wet magnetic rough tailings.

[0023] (b) Conduct scavenging wet magnetic separation on the wet magnetic rough tailings obtained in step (a) to obtain wet magnetic scavenging concentrate and wet magnetic scavenging tailings.

[0024] After the wet magnetic scavenging tailings are subjected to the first gravity separation scavenging, the first gravity separation scavenging concentrate and the first gravity separation scavenging tailings are obtained.

[0025] After the first gravity separation scavenging tailings are subjected to the second gravity separation scavenging, the second gravity separation scavenging concentrate and the second gravity separation scavenging tailings are obtained.

[0026] Mix the first gravity separation scavenging concentrate and the second gravity separation scavenging concentrate and conduct gravity separation cleaning to obtain gravity separation cleaning concentrate and gravity separation cleaning tailings.

[0027] (c) Conduct cleaning wet magnetic separation on the wet magnetic rough concentrate obtained in step (a) to obtain wet magnetic cleaning concentrate and wet magnetic cleaning tailings.

[0028] There is no sequence priority between the above steps (b) and (c).

[0029] (d), Mix the wet magnetic separation tailings obtained in step (c) with the wet magnetic scavenging concentrate obtained in step (b) and perform a third gravity separation scavenging to obtain a third gravity separation scavenging concentrate and a third gravity separation scavenging tailings.

[0030] Mix the third gravity separation scavenging concentrate, the gravity separation cleaning concentrate obtained in step (b), and the wet magnetic separation cleaning concentrate obtained in step (c) to obtain titanium concentrate.

[0031] The method for recovering titanium concentrate from beach placer mud and sand provided by the present invention can enrich and extract ilmenite, leucoxene and rutile in the mud and sand step by step according to their respective properties by de-sludging the beach placer, and can recover titanium dioxide in the mud and sand to the greatest extent. The grade of the obtained titanium concentrate is above 55%, and the titanium recovery rate is above 65%.

[0032] Moreover, this method has the advantages of simple process, conventional equipment used, and easy large-scale production.

[0033] In a preferred embodiment, in step (a), the mass fraction of the mud and sand in the pulp is 25% - 35%, including but not limited to any point value of 27%, 29%, 30%, 32%, 34% or the range value between any two of them.

[0034] In a preferred embodiment, in step (a), the magnetic field intensity of the wet magnetic separation roughing is 9000 - 11000 GS, including but not limited to any point value of 9500 GS, 10000 GS, 10500 GS or the range value between any two of them.

[0035] In a preferred embodiment, in step (b), the magnetic field intensity of the wet magnetic separation scavenging is 13000 - 16000 GS, including but not limited to any point value of 13500 GS, 14000 GS, 14500 GS, 15000 GS, 15500 GS or the range value between any two of them.

[0036] In a preferred embodiment, in step (b), the stroke of the first gravity separation scavenging is 12 - 20 mm, including but not limited to any point value of 13 mm, 15 mm, 16 mm, 18 mm or the range value between any two of them; the stroke frequency is 225 - 300 times / min, including but not limited to any point value of 230 times / min, 250 times / min, 270 times / min, 290 times / min or the range value between any two of them.

[0037] In a preferred embodiment, in step (b), the stroke of the second re-election scavenging is 15-25 mm, including but not limited to the point value of any one of 17 mm, 19 mm, 20 mm, 22 mm, 24 mm or the range value between any two of them; the stroke frequency is 200-275 times / min, including but not limited to the point value of any one of 210 times / min, 230 times / min, 250 times / min, 270 times / min or the range value between any two of them.

[0038] In a preferred embodiment, in step (b), the stroke of the re-election cleaning is 8-15 mm, including but not limited to the point value of any one of 9 mm, 10 mm, 12 mm, 14 mm or the range value between any two of them; the stroke frequency is 250-350 times / min, including but not limited to the point value of any one of 260 times / min, 270 times / min, 290 times / min, 300 times / min, 320 times / min, 340 times / min or the range value between any two of them.

[0039] In a preferred embodiment, in step (c), the magnetic field strength of the wet magnetic separation cleaning is 5000-7000 GS, including but not limited to the point value of any one of 5500 GS, 6000 GS, 6500 GS or the range value between any two of them.

[0040] In a preferred embodiment, in step (d), the stroke of the third re-election scavenging is 8-15 mm, including but not limited to the point value of any one of 9 mm, 10 mm, 12 mm, 14 mm or the range value between any two of them; the stroke frequency is 250-350 times / min, including but not limited to the point value of any one of 260 times / min, 270 times / min, 290 times / min, 300 times / min, 320 times / min, 340 times / min or the range value between any two of them.

[0041] In a preferred embodiment, in step (d), the grade of the titanium concentrate ≥ 55%; including but not limited to the point value of any one of 58%, 60%, 63%, 65%, 68%, 70%, 73%, 75%, 78%, 80% or the range value between any two of them.

[0042] Wherein, the grade of the titanium concentrate refers to the mass fraction of titanium dioxide in the titanium concentrate.

[0043] In a preferred embodiment, the main components of the titanium concentrate include at least one of leucoxene, rutile and ilmenite.

[0044] Specifically, the main component of the third gravity-selection scavenging concentrate is leucoxene, the main component of the gravity-selection beneficiation concentrate is rutile, and the main component of the wet magnetic beneficiation concentrate is ilmenite.

[0045] The principle of the method for recovering titanium concentrate from seaside sand ore provided by the present invention is as follows:

[0046] The mud and sand of coastal sand ore are relatively fine-grained, and the titanium dioxide present in them exists in three forms, namely ilmenite, leucoxene, and rutile, depending on the strength of its magnetism. Due to the fineness of the mud and sand, wet separation is selected to prevent dust from being blown away during the separation process, which would weaken the separation effect.

[0047] Using a high-magnetic-strength wet magnetic roughing process, most of the magnetic ilmenite and leucoxene present in the mud and sand can be concentrated in the wet magnetic roughing concentrate. However, due to the fine particle size and weak magnetic properties, a single roughing process cannot fully concentrate all of the magnetic ilmenite and leucoxene. Therefore, a higher magnetic-strength scavenging process is required to concentrate the ilmenite and leucoxene not enriched in the roughing process into the wet magnetic scavenging concentrate, thereby increasing the titanium yield. The wet magnetic scavenging tailings primarily consist of rutile and quartz. While both phases are non-magnetic, their specific gravitational density differs significantly, allowing gravity separation to separate the rutile from the gangue. However, due to the fine particle size, a single gravity separation process cannot fully concentrate the rutile, so a third gravity separation scavenging process is required to further enrich the rutile. To obtain a higher-grade rutile concentrate, the concentrates from these two gravity separations must be refined. The resulting gravity separation concentrate is the high-grade rutile concentrate.

[0048] Wet magnetic roughing concentrate is obtained by wet magnetic separation with high magnetic field strength, in which impurities such as quartz inevitably enter. These impurities are mainly introduced by white titanite with weaker magnetic properties. Therefore, it is necessary to reduce the magnetic field strength for wet magnetic separation. The wet magnetic selection concentrate is mainly composed of ilmenite mineral phase. This part has reached a higher titanium grade through two wet magnetic separations, one roughing and one fine, and has become a high-grade ilmenite concentrate.

[0049] The wet magnetic scavenging concentrate and wet magnetic beneficiation tailings are mainly composed of weakly magnetic white titanium stone, a small amount of ilmenite, rutile and quartz and other impurities. The magnetic difference between this part of the mixed phase of various titanium dioxide and quartz is relatively small, but there is a big difference in specific gravity. The two can be effectively separated by the third gravity scavenging to obtain high-grade titanium concentrate. By mixing this part of titanium concentrate with rutile concentrate and ilmenite concentrate, the titanium dioxide in the seaside sand ore mud can be recovered to the greatest extent, and high-quality ilmenite can be obtained at the same time.

[0050] In a preferred embodiment, in step (a), the mud and sand produced after desliming the beach placer are mixed with water and stirred into pulp to obtain pulp. The stirring time for pulping is 20 - 40 min, including but not limited to any point value among 25 min, 30 min, and 35 min or the range values between any two of them.

[0051] In a preferred embodiment, in step (b), the equipment used for the first gravity separation scavenging, the second gravity separation scavenging, and the gravity separation concentration is gravity separation equipment, more preferably a shaking table, but not limited thereto.

[0052] In a preferred embodiment, in step (d), the equipment used for the third gravity separation scavenging is gravity separation equipment, such as a shaking table, but not limited thereto.

[0053] In a preferred embodiment, after mixing the concentrate from the third gravity separation scavenging, the concentrate from the gravity separation concentration obtained in step (b), and the concentrate from the wet magnetic concentration obtained in step (c), it further includes the steps of pressure filtering and drying the mixed material.

[0054] In a second aspect, the present invention also provides the application of the method for recovering ilmenite concentrate from beach placer mud and sand in ore dressing.

[0055] During the process of ore dressing for beach placer, the above method is used to reprocess the generated waste mud and sand to recover ilmenite in the mud and sand, which can not only avoid waste of resources, but also increase the added value and reduce the production cost of ilmenite concentrate and its subsequent products.

[0056] The following will describe the implementation schemes of the present invention in detail with reference to the embodiments. However, those skilled in the art will understand that the following embodiments 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 embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified for the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0057] The titanium grade (referring to the mass fraction of titanium dioxide in the mud and sand) of the mud and sand produced after desliming the beach placer used in each of the following embodiments of the present invention is 28.19% (the same batch).

[0058] Example 1

[0059] The method for recovering ilmenite concentrate from beach placer mud and sand provided in this example includes the following steps:

[0060] (1) The mud and sand produced after desliming the beach placer are mixed with water and pulped for 30 min, and the pulp concentration (i.e., the mass fraction of mud and sand in the pulp) is controlled to be 30%. Then, the pulp is separated by rough wet magnetic separation at 10000 GS to obtain wet magnetic rough concentrate and wet magnetic rough tailings.

[0061] (2) The wet magnetic roughing tailings obtained in step (1) are subjected to wet magnetic scavenging at 16,000 GS to obtain wet magnetic scavenging concentrate and wet magnetic scavenging tailings. Then, a shaking table is used to perform the first gravity scavenging on the wet magnetic scavenging tailings, controlling the stroke of the shaking table to be 15 mm and the stroke frequency to be 250 r / min to obtain the first gravity scavenging concentrate and the first gravity scavenging tailings. The first gravity scavenging tailings are then subjected to the second gravity scavenging, controlling the stroke of the shaking table to be 20 mm and the stroke frequency to be 225 times / min to obtain the second gravity scavenging concentrate and the second gravity scavenging tailings. Subsequently, the first gravity scavenging concentrate and the second gravity scavenging concentrate are mixed and subjected to gravity concentration and cleaning using a shaking table, controlling the stroke of the shaking table to be 10 mm and the stroke frequency to be 300 times / min to obtain the gravity concentration and cleaning concentrate and the gravity concentration and cleaning tailings.

[0062] (3) The wet magnetic roughing concentrate obtained in step (1) is subjected to wet magnetic cleaning at 6,000 GS to obtain wet magnetic cleaning concentrate and wet magnetic cleaning tailings.

[0063] (4) The wet magnetic cleaning tailings obtained in step (3) are mixed with the wet magnetic scavenging concentrate obtained in step (2) and subjected to the third gravity scavenging, controlling the stroke of the shaking table to be 12 mm and the stroke frequency to be 300 times / min to obtain the third gravity scavenging concentrate and the third gravity scavenging tailings. Then, the third gravity scavenging concentrate (mainly composed of leucoxene), the gravity concentration and cleaning concentrate (mainly composed of rutile) obtained in step (2), and the wet magnetic cleaning concentrate (mainly composed of ilmenite) obtained in step (3) are mixed, filtered under pressure, and dried to obtain titanium concentrate.

[0064] Example 2

[0065] The method for recovering titanium concentrate from beach placer sand mud provided in this example includes the following steps:

[0066] (1) The mud sand generated after desliming the beach placer sand is mixed with water and slurried for 20 min, controlling the pulp concentration (i.e., the mass fraction of mud sand in the pulp) to be 25%, and then the pulp is subjected to rough separation by wet magnetic separation at 9,000 GS to obtain wet magnetic roughing concentrate and wet magnetic roughing tailings.

[0067] (2) The wet magnetic roughing tailings obtained in step (1) are subjected to wet magnetic scavenging at 15,000 GS to obtain wet magnetic scavenging concentrate and wet magnetic scavenging tailings. Then, a shaking table is used to perform the first gravity scavenging on the wet magnetic scavenging tailings, controlling the stroke of the shaking table to be 12 mm and the stroke frequency to be 230 r / min to obtain the first gravity scavenging concentrate and the first gravity scavenging tailings. The first gravity scavenging tailings are then subjected to the second gravity scavenging, controlling the stroke of the shaking table to be 15 mm and the stroke frequency to be 200 r / min to obtain the second gravity scavenging concentrate and the second gravity scavenging tailings. Subsequently, the first gravity scavenging concentrate and the second gravity scavenging concentrate are mixed and subjected to gravity concentration and cleaning using a shaking table, controlling the stroke of the shaking table to be 8 mm and the stroke frequency to be 260 r / min to obtain the gravity concentration and cleaning concentrate and the gravity concentration and cleaning tailings.

[0068] (3) The wet magnetic roughing concentrate obtained in step (1) is subjected to wet magnetic cleaning at 5,000 GS to obtain wet magnetic cleaning concentrate and wet magnetic cleaning tailings.

[0069] (4) The wet magnetic cleaning tailings obtained in step (3) are mixed with the wet magnetic scavenging concentrate obtained in step (2) and subjected to the third gravity scavenging, controlling the stroke of the shaking table to be 10 mm and the stroke frequency to be 250 r / min to obtain the third gravity scavenging concentrate and the third gravity scavenging tailings. Then, the third gravity scavenging concentrate (mainly composed of leucoxene), the gravity concentration and cleaning concentrate (mainly composed of rutile) obtained in step (2), and the wet magnetic cleaning concentrate (mainly composed of ilmenite) obtained in step (3) are mixed, filtered, and dried to obtain titanium concentrate.

[0070] Example 3

[0071] The method for recovering titanium concentrate from beach placer mud and sand provided in this example includes the following steps:

[0072] (1) The mud and sand generated after desliming the beach placer are mixed with water and slurried for 40 min, and the pulp concentration (i.e., the mass fraction of mud and sand in the pulp) is controlled to be 35%. Then, the pulp is separated by rough wet magnetic separation at 11,000 GS to obtain wet magnetic roughing concentrate and wet magnetic roughing tailings.

[0073] (2) The wet magnetic roughing tailings obtained in step (1) are subjected to wet magnetic scavenging at 13,000 GS to obtain wet magnetic scavenging concentrate and wet magnetic scavenging tailings. Then, a shaking table is used to perform the first gravity scavenging on the wet magnetic scavenging tailings, controlling the stroke of the shaking table to be 20 mm and the impulse to be 300 r / min to obtain the first gravity scavenging concentrate and the first gravity scavenging tailings. The first gravity scavenging tailings are then subjected to the second gravity scavenging, controlling the stroke of the shaking table to be 25 mm and the impulse to be 270 times / min to obtain the second gravity scavenging concentrate and the second gravity scavenging tailings. Subsequently, the first gravity scavenging concentrate and the second gravity scavenging concentrate are mixed and subjected to gravity concentration by a shaking table, controlling the stroke of the shaking table to be 15 mm and the impulse to be 350 times / min to obtain the gravity concentration concentrate and the gravity concentration tailings.

[0074] (3) The wet magnetic roughing concentrate obtained in step (1) is subjected to wet magnetic cleaning at 7,000 GS to obtain wet magnetic cleaning concentrate and wet magnetic cleaning tailings.

[0075] (4) The wet magnetic cleaning tailings obtained in step (3) are mixed with the wet magnetic scavenging concentrate obtained in step (2) and subjected to the third gravity scavenging, controlling the stroke of the shaking table to be 15 mm and the impulse to be 330 times / min to obtain the third gravity scavenging concentrate and the third gravity scavenging tailings. Then, the third gravity scavenging concentrate (mainly composed of leucoxene), the gravity concentration concentrate (mainly composed of rutile) obtained in step (2), and the wet magnetic cleaning concentrate (mainly composed of ilmenite) obtained in step (3) are mixed, filtered by pressure, and dried to obtain titanium concentrate.

[0076] Example 4 [[ID=?]] [[ID=?]]

[0077] The method for recovering titanium concentrate from beach placer mud and sand provided in this example includes the following steps:

[0078] (1) The mud and sand produced after desliming the beach placer are mixed with water and slurried for 35 min, controlling the pulp concentration (i.e., the mass fraction of mud and sand in the pulp) to be 33%. Then, the pulp is subjected to rough separation by wet magnetic separation at 9,500 GS to obtain wet magnetic roughing concentrate and wet magnetic roughing tailings.

[0079] It should be noted that the two "?" in the English translation correspond to the original " " and "

[0077] " which seem to be some kind of specific identifiers without clear semantic meaning in this context, so they are left as they are in the translation.(2) The wet magnetic roughing tailings obtained in step (1) are subjected to wet magnetic scavenging at 16,000 GS to obtain wet magnetic scavenging concentrate and wet magnetic scavenging tailings. Then, a shaking table is used to perform the first gravity scavenging on the wet magnetic scavenging tailings, controlling the stroke of the shaking table to be 18 mm and the impulse to be 260 r / min to obtain the first gravity scavenging concentrate and the first gravity scavenging tailings. The first gravity scavenging tailings are then subjected to the second gravity scavenging, controlling the stroke of the shaking table to be 22 mm and the impulse to be 240 times / min to obtain the second gravity scavenging concentrate and the second gravity scavenging tailings. Subsequently, the first gravity scavenging concentrate and the second gravity scavenging concentrate are mixed and subjected to gravity concentration and cleaning using a shaking table, controlling the stroke of the shaking table to be 12 mm and the impulse to be 300 times / min to obtain the gravity concentration and cleaning concentrate and the gravity concentration and cleaning tailings.

[0080] (3) The wet magnetic roughing concentrate obtained in step (1) is subjected to wet magnetic cleaning at 6,500 GS to obtain wet magnetic cleaning concentrate and wet magnetic cleaning tailings.

[0081] (4) The wet magnetic cleaning tailings obtained in step (3) are mixed with the wet magnetic scavenging concentrate obtained in step (2) and subjected to the third gravity scavenging, controlling the stroke of the shaking table to be 10 mm and the impulse to be 320 times / min to obtain the third gravity scavenging concentrate and the third gravity scavenging tailings. Then, the third gravity scavenging concentrate (mainly composed of leucoxene), the gravity concentration and cleaning concentrate (mainly composed of rutile) obtained in step (2), and the wet magnetic cleaning concentrate (mainly composed of ilmenite) obtained in step (3) are mixed, filtered, and dried to obtain titanium concentrate.

[0082] Example 5

[0083] The method for recovering titanium concentrate from beach placer mud and sand provided in this example is basically the same as that in Example 1, except that in step (1), the pulp concentration is replaced with 60%.

[0084] Example 6

[0085] The method for recovering titanium concentrate from beach placer mud and sand provided in this example is basically the same as that in Example 1, except that: in step (1), the magnetic field intensity of wet magnetic roughing is replaced with 16,000 GS, and in step (2), the magnetic field intensity of wet magnetic scavenging is replaced with 10,000 GS.

[0086] Example 7

[0087] The method for recovering titanium concentrate from beach placer mud and sand provided in this example is basically the same as that in Example 1, except that: in step (2), the stroke of the first gravity scavenging is replaced with 25 mm and the impulse is replaced with 200 r / min, and the stroke of the second gravity scavenging is replaced with 12 mm and the impulse is replaced with 300 times / min.

[0088] Example 8

[0089] The method for recovering ilmenite concentrate from beach placer mud and sand provided in this embodiment is basically the same as that in Embodiment 1, except that: in step (3), the magnetic field intensity of the wet magnetic separation concentration is replaced with 8000 GS; and in step (4), the stroke of the third gravity separation scavenging is replaced with 20 mm and the stroke frequency is 200 times / min.

[0090] Comparative Example 1

[0091] The method for recovering ilmenite from beach placer mud and sand provided in this comparative example includes the following steps:

[0092] (1) Screening and separating the beach placer mud and sand with a screen aperture of 1 mm to obtain the undersize material;

[0093] (2) Conducting weak magnetic separation on the undersize material with a magnetic field intensity of 800 Oe and a drum rotation speed of 10 rpm during weak magnetic separation to obtain magnetite and weak magnetic tailings;

[0094] (3) Conducting strong magnetic separation on the weak magnetic tailings with a heavy magnetic separator. The magnetic field intensity during strong magnetic separation is 5000 Oe to obtain ilmenite rough concentrate and strong magnetic tailings;

[0095] (4) Drying the ilmenite rough concentrate with a rotary kiln to remove moisture with a moisture content of 0.5% as the feed for electrostatic separation;

[0096] (5) Conducting electrostatic separation on the feed for electrostatic separation with a separation voltage of 25 kV and a rotation speed of 80 rpm.

[0097] Experimental Example

[0098] The grades of the ilmenite concentrates obtained in each of the above embodiments and Comparative Example 1 and the titanium recovery rate of the total titanium dioxide were measured respectively, and the results are shown in Table 1.

[0099] Among them, the grade of the ilmenite concentrate refers to the mass fraction of titanium dioxide in the ilmenite concentrate.

[0100] The titanium recovery rate of the total titanium dioxide refers to the percentage of the mass of titanium dioxide in the recovered ilmenite concentrate to the mass of titanium dioxide in the original beach placer mud and sand ore.

[0101] Table 1 Ilmenite Concentrate Grade and Titanium Recovery Rate

[0102]

[0103]

[0104] It can be seen by comparing Examples 1-4 with Examples 5-8 that parameters such as pulp concentration, magnetic field intensity of magnetic separation, stroke and stroke frequency of re-election scavenging, etc. will all have a certain impact on the grade of titanium concentrate and titanium recovery rate. And Examples 1-4 improved the grade of titanium concentrate and titanium recovery rate by adopting better process parameters.

[0105] The titanium recovery rate of the recovery method of Comparative Example 1 is significantly lower than that of each example, and the grade of the obtained titanium concentrate is also lower than that of each example. It can be seen that the method of Comparative Example 1 is only applicable to the beneficiation of beach placer, but not applicable to the recovery of muddy sand, and the titanium recovery rate is too low.

[0106] Although the present invention has been illustrated and described with specific examples, it should be realized that the above examples are only used to illustrate the technical solutions of the present invention, rather than to limit it; 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 examples 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 each example of the present invention; therefore, this means that all such replacements and modifications that belong to the scope of the present invention are included in the appended claims.

Claims

1. A method for recovering titanium concentrate from beach placer mud and sand, characterized in that, It includes the following steps: (a) The mud and sand produced after desliming the beach placer are mixed with water to form a pulp. The pulp is subjected to rough wet magnetic separation to obtain a rough wet magnetic separation concentrate and a rough wet magnetic separation tailing; (b) The rough wet magnetic separation tailing obtained in step (a) is subjected to scavenging wet magnetic separation to obtain a scavenging wet magnetic separation concentrate and a scavenging wet magnetic separation tailing; the scavenging wet magnetic separation tailing is subjected to first gravity scavenging to obtain a first gravity scavenging concentrate and a first gravity scavenging tailing; the first gravity scavenging tailing is subjected to second gravity scavenging to obtain a second gravity scavenging concentrate and a second gravity scavenging tailing; the first gravity scavenging concentrate and the second gravity scavenging concentrate are mixed and subjected to gravity concentration cleaning to obtain a gravity concentration cleaning concentrate and a gravity concentration cleaning tailing; (c) The rough wet magnetic separation concentrate obtained in step (a) is subjected to cleaning wet magnetic separation to obtain a cleaning wet magnetic separation concentrate and a cleaning wet magnetic separation tailing; (d) The cleaning wet magnetic separation tailing obtained in step (c) and the scavenging wet magnetic separation concentrate obtained in step (b) are mixed and subjected to third gravity scavenging to obtain a third gravity scavenging concentrate and a third gravity scavenging tailing; the third gravity scavenging concentrate, the gravity concentration cleaning concentrate obtained in step (b), and the cleaning wet magnetic separation concentrate obtained in step (c) are mixed to obtain titanium concentrate.

2. The method for recovering ilmenite concentrate from beach placer mud and sand according to claim 1, wherein, In step (a), the mass fraction of the mud and sand in the pulp is 25% - 35%.

3. The method for recovering ilmenite concentrate from beach placer mud and sand according to claim 1, characterized in that, In step (a), the magnetic field intensity of the rough wet magnetic separation is 9000 - 11000 GS.

4. The method for recovering titanium concentrate from beach placer mud and sand according to claim 1, characterized in that, In step (b), the magnetic field intensity of the scavenging wet magnetic separation is 13000 - 16000 GS.

5. The method for recovering ilmenite concentrate from beach placer mud and sand according to claim 1, characterized in that, In step (b), the stroke of the first gravity scavenging is 12 - 20 mm, and the stroke frequency is 225 - 300 times / min; And / or, in step (b), the stroke of the second gravity scavenging is 15 - 25 mm, and the stroke frequency is 200 - 275 times / min.

6. The method for recovering titanium concentrate from beach placer mud and sand according to claim 1, characterized in that, In step (b), the stroke of the gravity concentration cleaning is 8 - 15 mm, and the stroke frequency is 250 - 350 times / min.

7. The method for recovering ilmenite concentrate from beach placer mud and sand according to claim 1, characterized in that, In step (c), the magnetic field intensity of the cleaning wet magnetic separation is 5000 - 7000 GS.

8. The method for recovering ilmenite concentrate from beach placer mud and sand according to claim 1, characterized in that, In step (d), the stroke of the third gravity scavenging is 8 - 15 mm, and the stroke frequency is 250 - 350 times / min.

9. The method for recovering ilmenite concentrate from beach placer mud and sand according to claim 1, characterized in that, In step (d), the grade of the titanium concentrate ≥ 55%; And / or, in step (d), the main components of the titanium concentrate include at least one of leucoxene, rutile, and ilmenite.

10. The application of the method for recovering titanium concentrate from beach placer mud and sand according to any one of claims 1 - 9 in ore dressing.

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