A method and system for separating artificial rutile and red iron oxide

Abstract

This invention discloses a method and system for separating synthetic rutile and iron oxide red. The separation method includes the following steps: subjecting a mixture of iron oxide red and synthetic rutile slurry to multi-stage magnetic separation; separating non-magnetic substances obtained from the previous stage of magnetic separation using the next stage, resulting in non-magnetic substances obtained from the final stage of magnetic separation and magnetic substances obtained from each subsequent stage, with the magnetic separation intensity increasing sequentially; subjecting the non-magnetic substances obtained from the final stage of magnetic separation to multi-stage gravity separation, resulting in an overflow and a bottom flow, wherein the overflow is iron oxide red concentrate; separating the bottom flow and the magnetic substances obtained from the final stage of magnetic separation using a sluice box, resulting in a concentrate and tailings; and combining the concentrate with the magnetic substances obtained from all other stages of magnetic separation except the final stage, to obtain synthetic rutile concentrate. The synthetic rutile and iron oxide red separation method provided in this application yields synthetic rutile with high yield and good grade.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing engineering, and in particular to a method and a system for separating artificial rutile and red iron oxide. Background Art

[0002] Artificial rutile is identical to natural rutile in composition and structural properties, and is a high-quality substitute for natural rutile. It is used in large quantities in the production of chloride-process titanium dioxide, as well as in the production of titanium tetrachloride, metallic titanium, enamel products, and welding rod coatings. It can also be used in the production of artificial rutile yellow pigments.

[0003] The production of artificial rutile by the rust method will produce a large amount of red iron oxide. The red iron oxide and artificial rutile form a slurry that needs to be separated. At present, the separation methods used at home and abroad are basically gravity separation, such as hydrocyclone + spiral chute, hydrocyclone + vibrating screen or shaking table for separation. The above separation methods all have the disadvantages of low separation accuracy, low separation efficiency, and large footprint. Because artificial rutile and red iron oxide slurry contain chloride ions and the pH is 2-3, the above separation methods also have the disadvantages of severe equipment corrosion, frequent equipment maintenance, and high production and operation costs.

[0004] Therefore, it is of great significance to invent a separation method that is simple and efficient, has a high equipment operating rate and low operating cost. Summary of the invention

[0005] The main purpose of the present invention is to provide a method and system for separating artificial rutile from red iron oxide, aiming to solve the problems of low efficiency and high production cost of the existing separation of artificial rutile and red iron oxide.

[0006] To achieve the above object, the present invention provides a method for separating artificial rutile from red iron oxide, comprising the following steps:

[0007] S10, subjecting the mixed slurry of hydrated iron oxide and artificial rutile to multi-stage magnetic separation, and subjecting the non-magnetic material obtained by the previous stage of magnetic separation to the next stage of magnetic separation, so as to obtain the non-magnetic material obtained by the last stage of magnetic separation and the magnetic material obtained by each stage of magnetic separation; wherein the magnetic separation intensity of the multi-stage magnetic separation increases successively;

[0008] S20, performing multi-stage gravity separation on the non-magnetic material obtained by the last stage of magnetic separation to obtain overflow and underflow, wherein the overflow is red iron ore concentrate;

[0009] S30, mixing the underflow obtained by multi-stage gravity separation with the magnetic material obtained by the last stage of magnetic separation, and performing chute separation to obtain concentrate and tailings;

[0010] S40, combining the concentrate obtained by chute separation with the magnetic materials obtained by magnetic separation at all levels except the last level to obtain artificial rutile concentrate.

[0011] Optionally, in step S10, the multi-stage magnetic separation includes a first-stage magnetic separation, a second-stage magnetic separation, and a third-stage magnetic separation;

[0012] Wherein, the magnetic field strength of the first-stage magnetic separation is 0.3T to 0.4T; and / or,

[0013] The magnetic field strength of the second-stage magnetic separation is 0.5T to 0.6T; and / or,

[0014] The magnetic field strength of the third-stage magnetic separation is 0.8T to 1.0T.

[0015] Optionally, step S20 includes:

[0016] The non-magnetic material obtained by the last stage of magnetic separation is subjected to multi-stage gravity separation, the overflow obtained by the previous stage of gravity separation is subjected to the next stage of gravity separation, and the overflow obtained by the last stage of gravity separation is iron ore concentrate.

[0017] Optionally, step S20 further includes:

[0018] The underflow obtained from the next stage of gravity separation is returned to the previous stage for gravity separation, and the underflow obtained from the first stage of gravity separation is used for chute separation.

[0019] Optionally, step S30 further includes:

[0020] The tailings obtained by separation in the chute are used for multi-stage gravity separation.

[0021] The present invention also provides a system for separating artificial rutile from red iron oxide, the system comprising a multi-stage magnetic separation device, a multi-stage gravity separation device and a chute which are sequentially arranged;

[0022] The multi-stage magnetic separation device comprises a plurality of magnetic separators arranged in sequence, for performing multi-stage magnetic separation on the mixed slurry of hydrated iron oxide and artificial rutile; wherein the plurality of magnetic separators each comprises a feed port, a magnetic material discharge port and a non-magnetic material discharge port, and in two adjacent magnetic separators, the feed port of the next-stage magnetic separator is connected to the non-magnetic material discharge port of the previous-stage magnetic separator;

[0023] The multi-stage gravity separation device comprises a plurality of classification buckets arranged in series, which are used to perform multi-stage gravity separation on the non-magnetic materials separated by the multi-stage magnetic separation device; wherein the plurality of classification buckets each comprises an inlet, an overflow outlet and an underflow outlet, and the non-magnetic material outlet of the last-stage magnetic separator is connected to the inlet of the first classification bucket; in two adjacent classification buckets, the overflow outlet of the upper-stage classification bucket is connected to the inlet of the lower-stage classification bucket;

[0024] The feed port of the chute is connected to the underflow discharge port of the first-stage grading bucket and the magnetic material outlet of the last-stage magnetic separator, so as to perform chute separation on the underflow separated by the multi-stage gravity separation device and the magnetic material separated by the last-stage magnetic separator.

[0025] Optionally, in the multi-stage gravity separation device, in two adjacent grading buckets, the bottom flow outlet of the lower grading bucket is connected to the feed inlet of the upper grading bucket, and the bottom flow outlet of the first grading bucket is connected to the feed inlet of the chute.

[0026] Optionally, the magnetic separator is a plate magnetic separator; and / or,

[0027] The grading bucket is an inclined plate gravity hydraulic grading bucket or an inclined tube gravity hydraulic grading bucket; and / or,

[0028] The chute is a belt chute.

[0029] Optionally, a rising water flow mechanism is provided at the bottom of each grading bucket; and / or,

[0030] A valve is provided on the bottom flow outlet of each grading bucket.

[0031] Optionally, it is characterized in that the chute is a belt chute, and the belt of the belt chute is an anti-corrosion rubber belt.

[0032] The technical solution of the present invention utilizes the differences in magnetism, particle size, density, etc. between artificial rutile and red iron oxide, and separates and recovers artificial rutile from red iron oxide in gradients through multi-stage magnetic separation, multi-stage gravity separation, and chute separation. First, the mixed slurry of hydrated iron oxide and artificial rutile is subjected to multiple magnetic separations with successively increasing magnetic field intensities. Artificial rutile with strong magnetism is screened out first, and the last stage of magnetic separation may mis-magnetize some red iron oxide. Therefore, the magnetic material obtained by the last stage of magnetic separation cannot be directly used as artificial rutile concentrate. Among the non-magnetic materials obtained by the last stage of magnetic separation, there is still a small amount of artificial rutile with extremely weak magnetism or no magnetism. By utilizing the differences in particle size and specific gravity between these weakly magnetic and non-magnetic rutile and red iron oxide, multi-stage gravity separation is adopted, and the rutile with large and heavy particle size is selected. With the bottom flow being screened out, and because the precision of multi-stage gravity separation is not high, the bottom flow is mixed with some iron red, so the present application uses a chute to enrich the bottom flow obtained by multi-stage gravity separation, and further separates the iron red in the bottom flow obtained by multi-stage gravity separation, so that the grade of artificial rutile is improved. At the same time, the magnetic material obtained by the last stage of magnetic separation is also mixed with iron red. Based on the above reasons, the present application also uses a chute to enrich artificial rutile with the magnetic material obtained by the last stage of magnetic separation and the bottom flow obtained by multi-stage gravity separation, so that the grade of artificial rutile is improved. Therefore, a method for separating artificial rutile from iron red provided by the present application not only has high separation efficiency, but also has high yield and good grade of separated artificial rutile. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0034] Figure 1 This is a schematic flow chart of an embodiment of a method for separating artificial rutile from red iron oxide according to the present invention;

[0035] Figure 2 The figure is a schematic flow chart of multi-stage gravity separation in one embodiment of the method for separating artificial rutile from red iron oxide of the present invention.

[0036] Description of the accompanying drawings of the embodiments provided by the present invention:

[0037]

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The production of artificial rutile by the rust method will produce a large amount of red iron oxide, which forms a slurry with artificial rutile and needs to be separated. At present, the separation methods used at home and abroad are basically gravity separation, such as using hydrocyclone + spiral chute, hydrocyclone + vibrating screen or shaking table for separation. The above separation methods all have the disadvantages of low separation accuracy, low separation efficiency, and large floor space. Because artificial rutile and red iron oxide slurry contain chloride ions and the pH is 2-3, the above separation methods also have the disadvantages of serious equipment corrosion, frequent equipment maintenance, and high production and operation costs. Therefore, it is of great significance to invent a simple and efficient separation method with high equipment operation rate and low operation cost.

[0043] In view of this, the present invention proposes a method and system for separating artificial rutile from red iron oxide, aiming to solve the problems of low efficiency and high production cost of the existing separation of artificial rutile from red iron oxide. Figure 1 to Figure 2 , Figure 1This is a schematic flow chart of an embodiment of a method for separating artificial rutile from red iron oxide according to the present invention; Figure 2 The figure is a schematic flow chart of multi-stage gravity separation in one embodiment of the method for separating artificial rutile from red iron oxide of the present invention.

[0044] See also Figure 1 The method for separating artificial rutile from red iron oxide comprises the following steps:

[0045] S10, subjecting the mixed slurry of hydrated iron oxide and artificial rutile to multi-stage magnetic separation, and subjecting the non-magnetic material obtained by the previous stage of magnetic separation to the next stage of magnetic separation, so as to obtain the non-magnetic material obtained by the last stage of magnetic separation and the magnetic material obtained by each stage of magnetic separation; wherein the magnetic separation intensity of the multi-stage magnetic separation increases successively;

[0046] S20, performing multi-stage gravity separation on the non-magnetic material obtained by the last stage of magnetic separation to obtain overflow and underflow, wherein the overflow is red iron ore concentrate;

[0047] S30, mixing the underflow obtained by multi-stage gravity separation with the magnetic material obtained by the last stage of magnetic separation, and performing chute separation to obtain concentrate and tailings;

[0048] S40, combining the concentrate obtained by chute separation with the magnetic materials obtained by magnetic separation at all levels except the last level to obtain artificial rutile concentrate.

[0049] The technical solution of the present invention utilizes the differences in magnetism, particle size, density, etc. between artificial rutile and red iron oxide, and separates and recovers artificial rutile from red iron oxide in gradients through multi-stage magnetic separation, multi-stage gravity separation, and chute separation. First, the mixed slurry of hydrated iron oxide and artificial rutile is subjected to multiple magnetic separations with successively increasing magnetic field intensities. Artificial rutile with strong magnetism is screened out first, and the last stage of magnetic separation may mis-magnetize some red iron oxide. Therefore, the magnetic material obtained by the last stage of magnetic separation cannot be directly used as artificial rutile concentrate. Among the non-magnetic materials obtained by the last stage of magnetic separation, there is still a small amount of artificial rutile with extremely weak magnetism or no magnetism. By utilizing the differences in particle size and specific gravity between these weakly magnetic and non-magnetic rutile and red iron oxide, multi-stage gravity separation is adopted, and the rutile with large and heavy particle size is selected. With the bottom flow being screened out, and because the precision of multi-stage gravity separation is not high, the bottom flow is mixed with some iron red, so the present application uses a chute to enrich the bottom flow obtained by multi-stage gravity separation, and further separates the iron red in the bottom flow obtained by multi-stage gravity separation, so that the grade of artificial rutile is improved. At the same time, the magnetic material obtained by the last stage of magnetic separation is also mixed with iron red. Based on the above reasons, the present application also uses a chute to enrich artificial rutile with the magnetic material obtained by the last stage of magnetic separation and the bottom flow obtained by multi-stage gravity separation, so that the grade of artificial rutile is improved. Therefore, a method for separating artificial rutile from iron red provided by the present application not only has high separation efficiency, but also has high yield and good grade of separated artificial rutile.

[0050] It should be noted that the multi-stage magnetic separation refers to multiple magnetic separations of materials, and the previous stage magnetic separation and the next stage magnetic separation are relative to the flow order of the materials. For example, when performing secondary magnetic separation, that is, two magnetic separations, the material is first subjected to the first magnetic separation, and the non-magnetic material obtained by the first magnetic separation is then subjected to the second magnetic separation, wherein the first magnetic separation is the previous stage of the second magnetic separation, and the last stage of magnetic separation is the second magnetic separation.

[0051] Further, in step S10, the multi-stage magnetic separation includes first-stage magnetic separation, second-stage magnetic separation and third-stage magnetic separation; wherein the magnetic field strength of the first-stage magnetic separation is 0.3T~0.4T; the magnetic field strength of the second-stage magnetic separation is 0.5T~0.6T; the magnetic field strength of the third-stage magnetic separation is 0.8T~1.0T. In some embodiments of the present invention, a mixed slurry of hydrated iron oxide and artificial rutile is subjected to three magnetic separations, that is, three-stage magnetic separation. The mixed slurry of hydrated iron oxide and artificial rutile is subjected to the first magnetic separation with a magnetic field strength of 0.3T to 0.4T, thereby separating the artificial rutile with the strongest magnetism. The non-magnetic material obtained by the first magnetic separation is subjected to the second magnetic separation with a magnetic field strength of 0.5T to 0.6T, thereby separating the artificial rutile with slightly weaker magnetism. The first and second magnetic separations can prevent red iron oxide from being entrained in the artificial rutile, resulting in incomplete separation and affecting the quality of the artificial rutile. The non-magnetic material obtained by the second magnetic separation is subjected to the third magnetic separation with a magnetic field strength of 0.8T to 1.0T, thereby separating the artificial rutile with weaker magnetism. However, under this magnetic field strength, a part of the red iron oxide will be magnetically separated together. Therefore, the magnetic material obtained by the third magnetic separation, that is, the last stage of magnetic separation, is processed by subsequent operations. It should be noted that four-stage magnetic separation, five-stage magnetic separation, etc. can also be performed, and the magnetic field strength of each stage can be adjusted accordingly, and the present invention does not limit this. However, a better separation effect can be achieved by using three-stage magnetic separation and subsequent separation operations, and more magnetic separation times will result in higher production costs.

[0052] Combined with reference Figure 2 Step S20 includes: performing multi-stage gravity separation on the non-magnetic material obtained from the last stage of magnetic separation, the overflow obtained from the previous stage of gravity separation is separated by the next stage of gravity separation, and the overflow obtained from the last stage of gravity separation is iron ore concentrate. It should be noted that Figure 2 Taking three-stage gravity separation as an example, the multi-stage gravity separation in this application can also be four-stage gravity separation, five-stage gravity separation, etc., and is not limited to the attached Figure 2 In each level of gravity separation, the artificial rutile with large particle size and heavy weight will be screened out with the bottom flow, and the overflow will be fed into the next level of gravity separation device for further gravity separation, and the artificial rutile that has not been screened out in the previous level will be screened out. And so on, after multiple gravity separations, the red iron oxide is enriched in the overflow obtained at last, so as to obtain a red iron oxide concentrate with less impurities and high yield.

[0053] In addition, step S20 also includes: the underflow obtained by the next-stage gravity separation is returned to the previous stage for gravity separation, and the underflow obtained by the first-stage gravity separation is used for chute separation. The underflow obtained by the next-stage gravity separation is returned to the previous stage for gravity separation to form a cycle, and the unscreened rutile can be screened multiple times. The underflow obtained by the first-stage gravity separation contains not only most of the artificial rutile, but also a small amount of red iron oxide, so chute separation can be performed to further enrich the artificial rutile, thereby improving the yield of the artificial rutile.

[0054] Furthermore, step S30 also includes: the tailings obtained by the chute separation are used for multi-stage gravity separation. After the chute separation, in addition to the enriched artificial rutile concentrate, there are also tailings containing artificial red iron oxide, which are gravity-separated again to form a cycle and can better separate the artificial rutile and red iron oxide, thereby improving the yield of red iron oxide.

[0055] The present invention also proposes a system for separating artificial rutile from iron oxide, the system comprising a multi-stage magnetic separation device, a multi-stage gravity separation device and a chute arranged in sequence; the multi-stage magnetic separation device comprises a plurality of magnetic separators arranged in sequence, for performing multi-stage magnetic separation on a mixed slurry of hydrated iron oxide and artificial rutile; wherein the plurality of magnetic separators each comprises a feed inlet, a magnetic material discharge port and a non-magnetic material discharge port, and in two adjacent magnetic separators, the feed inlet of the magnetic separator of the next stage is connected to the non-magnetic material discharge port of the magnetic separator of the previous stage; the multi-stage gravity separation device comprises a plurality of grading buckets arranged in series, Used to perform multi-stage gravity separation on the non-magnetic material separated by the multi-stage magnetic separation device; wherein the multiple grading buckets all include an inlet, an overflow outlet and an underflow outlet, and the non-magnetic material outlet of the last-stage magnetic separator is connected to the inlet of the first grading bucket; in two adjacent grading buckets, the overflow outlet of the upper-stage grading bucket is connected to the inlet of the lower-stage grading bucket; the feed inlet of the chute is connected to the underflow outlet of the first-stage grading bucket and the magnetic material outlet of the last-stage magnetic separator, so as to perform chute separation on the underflow separated by the multi-stage gravity separation device and the magnetic material separated by the last-stage magnetic separator.

[0056] In the artificial rutile and iron red separation system provided by the present invention, a multi-stage magnetic separation device is first used to perform multi-stage magnetic separation on the iron red and artificial rutile mixed slurry, the magnetic field strength of the multi-stage magnetic separation device is successively increased, so as to successively screen out artificial rutile with increasingly weak magnetic strength, while a small amount of artificial rutile with extremely weak or no magnetic strength still exists in the material discharged from the non-magnetic material discharge port of the last-stage magnetic separator, and a plurality of grading buckets arranged in series are used to further gravity separate the material discharged from the non-magnetic material discharge port of the last-stage magnetic separator, the grading buckets are used to grade the material according to the specific gravity of the mineral and the difference in the sedimentation velocity of the mineral particles in the medium, since the particle size of red iron oxide is very fine and the particle size of artificial iron oxide is slightly coarse, there is a difference in sedimentation velocity between the two, so the material at the overflow discharge port is mainly red iron oxide, the overflow discharge port of the upper-stage grading bucket is connected to the feed port of the lower-stage grading bucket, so that the artificial rutile in the overflow is gravity screened multiple times, thereby increasing the content of red iron oxide in the overflow to increase the yield of red iron oxide. Since the material coming out of the bottom flow outlet of the first-stage grading bucket is mixed with some iron oxide, the material coming out of the bottom flow outlet of the first-stage grading bucket is passed into the feed port of the chute to enrich the artificial rutile, and the iron oxide in the material coming out of the bottom flow outlet of the first-stage grading bucket is further separated out, so that the grade of the artificial rutile is improved. At the same time, the material coming out of the magnetic material outlet of the last-stage magnetic separator is also mixed with iron oxide. Based on the above reasons, the material coming out of the magnetic material outlet of the last-stage magnetic separator is passed into the feed port of the chute to enrich the artificial rutile, so that the grade of the artificial rutile is improved. Therefore, the separation system of artificial rutile and iron oxide provided by the present application not only has high separation efficiency, but also has high yield and good grade of separated artificial rutile.

[0057] Furthermore, in the multi-stage gravity separation device, in two adjacent grading buckets, the bottom flow outlet of the next grading bucket is connected to the feed port of the previous grading bucket, and the bottom flow outlet of the first grading bucket is connected to the feed port of the chute. The material coming out of the bottom flow outlet of the next grading bucket returns to the feed port of the previous grading bucket for gravity separation, which can make the separation system form a closed loop to improve the separation efficiency of artificial rutile and iron oxide red, and can screen the unscreened rutile multiple times. The material coming out of the bottom flow outlet of the first grading bucket contains not only most of the artificial rutile, but also a small amount of iron oxide red, so it can be passed into the feed port of the chute for separation to further enrich the artificial rutile, thereby improving the yield of artificial rutile.

[0058] Furthermore, the magnetic separator is a plate magnetic separator. Since the rust slurry containing artificial rutile and iron oxide still has a temperature of about 60°C during separation, and the rust slurry is strongly acidic and contains chloride ions, the use of a plate magnetic separator can reduce the corrosion of the rust slurry containing artificial rutile and iron oxide to the magnetic separator, thereby improving the service life of the equipment. The grading bucket is an inclined plate gravity hydraulic grading bucket or an inclined tube gravity hydraulic grading bucket. The grading bucket can also be lined with anti-corrosion materials, and the coarse-grained artificial rutile is magnetically recovered. Most of the slurry particle size entering the gravity grading tank is less than 30μm, and the wear capacity of the gravity grading tank is limited. The chute is a belt chute. When the material enters the belt chute, the artificial rutile is deposited at the bottom of the chute, and is brought to the concentrate end with the movement of the belt. The material is unloaded under the action of flushing water. The iron oxide cannot be deposited at the bottom of the belt due to its fine particles and light specific gravity, and enters the tailings end, which can be transported to the gravity separation device for re-separation. It should be noted that the present invention does not limit the type of the chute, but the use of a belt chute can improve the efficiency and effect of separation compared to an ordinary chute. The plate magnetic separator and the belt chute can be used simultaneously or separately. When used simultaneously, the system structure is simple, the failure rate is low, and the parts in contact with the slurry are corrosion-resistant rubber, the equipment is not easy to corrode, has a long service life, and a low maintenance rate. In addition, the belt chute can adjust the slope and the belt running speed according to demand, so as to accurately control the separation accuracy of artificial rutile and iron red; the plate magnetic separator can adjust the distance between the belt and the magnetic system to achieve a small range of magnetic field strength adjustment, so as to accurately control the separation accuracy of artificial rutile and iron red of the plate magnetic separator.

[0059] In addition, the bottom of each grading bucket is provided with an ascending water flow mechanism, and the bottom flow outlet of each grading bucket is provided with a valve. The bottom of each grading bucket is independently provided with an ascending water flow device and a bottom flow valve, so that the separation of artificial rutile and iron red can be accurately controlled by adjusting the ascending water flow rate and the bottom flow valve opening.

[0060] Furthermore, the chute is a belt chute, and the belt of the belt chute is an anti-corrosion rubber belt. Since the temperature of the rusty slurry is about 60°C during separation, and the rusty slurry is strongly acidic and contains chloride ions, the use of an anti-corrosion rubber belt can prevent the belt from being corroded and extend the service life of the equipment.

[0061] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0062] Example

[0063] The following method is used to separate the mixed slurry of artificial rutile and red iron oxide:

[0064] (1) subjecting the mixed slurry of red iron oxide and artificial rutile to three-stage magnetic separation, wherein the magnetic field strength of the first stage magnetic separation is 0.35T, the magnetic field strength of the second stage magnetic separation is 0.5T, and the magnetic field strength of the third stage magnetic separation is 0.9T, and the non-magnetic material obtained by the previous stage magnetic separation is separated by the next stage magnetic separation to obtain the non-magnetic material obtained by the third stage magnetic separation and the magnetic material obtained by each stage magnetic separation;

[0065] (2) The non-magnetic material obtained by the last stage of magnetic separation is subjected to multi-stage gravity separation, the overflow obtained by the previous stage of gravity separation is used for the next stage of gravity separation, the underflow obtained by the next stage of gravity separation is returned to the previous stage for gravity separation, and the underflow obtained by the first stage of gravity separation is used for chute separation; the overflow obtained by the last stage of gravity separation is iron ore concentrate;

[0066] (3) mixing the underflow obtained by the first stage gravity separation with the magnetic material obtained by the third stage magnetic separation, and performing chute separation to obtain concentrate and tailings, wherein the tailings obtained by the chute separation are used for multi-stage gravity separation;

[0067] (4) The concentrate obtained by chute separation is combined with the magnetic materials obtained by magnetic separation at all levels except the last level to obtain artificial rutile concentrate.

[0068] Comparative Example

[0069] First, a cyclone is used to perform preliminary separation of artificial rutile and red iron oxide. The bottom flow of the cyclone is fed into a shaking table for separation. The shaking table concentrate is the artificial rutile concentrate, and the shaking table tailings and cyclone overflow are red iron oxide concentrate.

[0070] The data comparison of production indicators of the methods for separating artificial rutile and red iron oxide provided in the embodiments and comparative examples is shown in Table 1.

[0071] Table 1 Production indicators obtained in the embodiments and comparative examples

[0072]

[0073] As can be seen from Table 1, the production index of the artificial rutile and red iron oxide method adopted in the embodiment of the present invention is significantly better than that of the comparative example, which is specifically reflected in that the TiO2 content of the artificial rutile concentrate obtained in the embodiment is 1.2 percentage points higher than that of the comparative example, and the recovery rate is 4.5 percentage points higher, while the TFe content in the red iron oxide concentrate is also about 4.7 percentage points higher, and the recovery rate is also about 2 percentage points higher. It shows that the artificial rutile separated by the artificial rutile and red iron oxide separation method provided in this application has a high yield and good grade.

[0074] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A method for separating artificial rutile and red iron oxide, characterized in that: The following steps are involved: S10, subjecting the mixed slurry of red iron oxide and artificial rutile to multi-stage magnetic separation, and subjecting the non-magnetic material obtained by the previous stage of magnetic separation to the next stage of magnetic separation, to obtain the non-magnetic material obtained by the last stage of magnetic separation and the magnetic material obtained by each stage of magnetic separation, wherein the magnetic separation intensity of the multi-stage magnetic separation increases successively; S20, performing multi-stage gravity separation on the non-magnetic material obtained by the last stage of magnetic separation to obtain overflow and underflow, wherein the overflow is red iron ore concentrate; S30, mixing the underflow obtained by multi-stage gravity separation with the magnetic material obtained by the last stage of magnetic separation, and performing chute separation to obtain concentrate and tailings; S40, combining the concentrate obtained by chute separation with the magnetic substances obtained by magnetic separation at all levels except the last level to obtain artificial rutile concentrate; Wherein, step S20 includes: The non-magnetic material obtained by the last stage of magnetic separation is subjected to multi-stage gravity separation, the overflow obtained by the previous stage of gravity separation is subjected to the next stage of gravity separation, and the overflow obtained by the last stage of gravity separation is iron ore concentrate; The underflow obtained from the next stage of gravity separation is returned to the previous stage for gravity separation, and the underflow obtained from the first stage of gravity separation is used for chute separation.

2. The method for separating artificial rutile from red iron oxide according to claim 1, wherein: In step S10, the multi-stage magnetic separation includes a first stage magnetic separation, a second stage magnetic separation and a third stage magnetic separation; Wherein, the magnetic field strength of the first-stage magnetic separation is 0.3T~0.4T; and / or, The magnetic field strength of the second-stage magnetic separation is 0.5T~0.6T; and / or, The magnetic field strength of the third-stage magnetic separation is 0.8T~1.0T.

3. The method for separating artificial rutile and red iron oxide as claimed in claim 1, characterized in that, Step S30 also includes: The tailings obtained by separation in the chute are used for multi-stage gravity separation.

4. A system for separating artificial rutile and red iron oxide, characterized in that: It includes a multi-stage magnetic separation device, a multi-stage gravity separation device and a chute which are arranged in sequence; The multi-stage magnetic separation device comprises a plurality of magnetic separators arranged in sequence, for performing multi-stage magnetic separation on the mixed slurry of hydrated iron oxide and artificial rutile; wherein the plurality of magnetic separators each comprises a feed port, a magnetic material discharge port and a non-magnetic material discharge port, and in two adjacent magnetic separators, the feed port of the next-stage magnetic separator is connected to the non-magnetic material discharge port of the previous-stage magnetic separator; The multi-stage gravity separation device comprises a plurality of classification buckets arranged in series, which are used to perform multi-stage gravity separation on the non-magnetic materials separated by the multi-stage magnetic separation device; wherein the plurality of classification buckets each comprises an inlet, an overflow outlet and an underflow outlet, and the non-magnetic material outlet of the last-stage magnetic separator is connected to the inlet of the first classification bucket; in two adjacent classification buckets, the overflow outlet of the upper-stage classification bucket is connected to the inlet of the lower-stage classification bucket; The feed end of the chute is connected to the underflow discharge port of the first-stage grading bucket and the magnetic material outlet of the last-stage magnetic separator, so as to perform chute separation on the underflow separated by the multi-stage gravity separation device and the magnetic material separated by the last-stage magnetic separator.

5. The system for separating artificial rutile and red iron oxide according to claim 4, characterized in that: In the multi-stage gravity separation device, in two adjacent grading buckets, the bottom flow outlet of the next grading bucket is connected to the feed port of the previous grading bucket, and the bottom flow outlet of the first grading bucket is connected to the feed port of the chute.

6. The system for separating artificial rutile and red iron oxide according to claim 4, characterized in that: The magnetic separator is a plate type magnetic separator; and / or, The grading bucket is an inclined plate gravity hydraulic grading bucket or an inclined tube gravity hydraulic grading bucket; and / or, The chute is a belt chute.

7. The system for separating artificial rutile and red iron oxide according to claim 4, characterized in that: A rising water flow mechanism is provided at the bottom of each grading bucket; and / or, A valve is provided on the bottom flow outlet of each grading bucket.

8. The system for separating artificial rutile and red iron oxide according to claim 4, characterized in that: The chute is a belt chute, and the belt of the belt chute is an anti-corrosion rubber belt.

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