Beneficiation and purification method for rutile in beach placer

Abstract

The invention belongs to the technical field of mineral separation, and particularly relates to a mineral separation and purification method for rutile in beach placer. 2, magnetic minerals are separated, and first rutile rough concentrate is obtained; 3, conducting electric separation to obtain a conductor product and a non-conductor product; compared with the prior art, the method has the advantages that magnetic minerals are separated firstly, then electric separation and concentration are performed, rutile and impurity minerals can be separated thoroughly, the grade and the recovery rate of TiO2 in the rutile concentrate are improved, and the purity of the rutile concentrate is improved through screening, magnetic separation, multi-stage electric separation and high-intensity magnetic separation. The TiO2 grade of the final rutile concentrate is greater than or equal to 90% and is far higher than the initial grade range of 40-90% of the raw materials, and the application requirements of high-purity rutile are met.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, specifically relating to a method for beneficiation and purification of rutile in coastal placer deposits. Background Technology

[0002] Currently, coastal placer deposits are important mineral resources distributed in coastal areas. Their formation is closely related to wave transport and sedimentation. They are characterized by rich mineral types, uniform particle size, high degree of liberation of individual particles, and low mud content. They can be directly introduced into the sorting process without crushing and grinding. Coastal placer deposits often contain a variety of valuable minerals such as ilmenite, zircon, rutile, and monazite. Among them, rutile has a high titanium content and is an important titanium-bearing mineral. It has excellent properties such as high temperature resistance, low temperature resistance, corrosion resistance, high strength, and low specific gravity. It is widely used in military, aviation, aerospace, navigation, machinery, chemical industry, and seawater desalination. It is also an important raw material for the production of rutile titanium dioxide and high-grade welding electrodes.

[0003] However, rutile content in coastal placer deposits is usually low, and it is closely associated with minerals such as ilmenite and zircon, making it difficult to separate efficiently using traditional beneficiation methods. In existing technologies, single magnetic separation, single electrostatic separation, or a combination of magnetic and electrostatic separation can easily lead to incomplete separation of rutile from impurity minerals, resulting in low concentrate grade and recovery rate. Some beneficiation plants have introduced flotation, acid washing, or roasting processes, which not only increase costs but may also cause environmental pollution and fail to fully utilize the natural characteristics of coastal placer deposits, while also making it difficult to achieve comprehensive recovery of multiple minerals. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for beneficiation and purification of rutile in coastal placer deposits.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: a method for beneficiation and purification of rutile in coastal placer deposits, comprising the following steps: Step 1: Raw material processing; Step 2: Separate the magnetic minerals to obtain rutile rough concentrate 1; Step 3: Electrostatic separation yields conductor and non-conductor products; Step 4: Pass the conductor product through multi-stage electrostatic separation and strong magnetic separation to obtain rutile concentrate.

[0006] Preferably, the raw material in step one contains ilmenite, zircon, rutile, garnet and monazite, and the TiO2 grade in the raw material is 40-90%.

[0007] Preferably, the raw materials in step one need to be screened and separated by a 40-200 mesh sieve to remove coarse particles from the raw materials.

[0008] Preferably, step two includes: feeding the raw material processed in step one into a permanent magnet drum separator, setting the magnetic field strength to 0.4-0.9T and the drum speed to 20-40r / min, removing magnetic minerals, and obtaining a non-magnetic product, rutile rough concentrate.

[0009] Preferably, step three includes: feeding the rutile rough concentrate obtained in step two into a cylindrical high-voltage electrostatic separator, setting the separation voltage to 20-40kV and the cylinder rotation speed to 100-300r / min, and obtaining the conductor product as rutile rough concentrate.

[0010] Preferably, the TiO2 grade in the rutile rough concentrate separated in step three is ≥80%, and the TiO2 recovery rate in this process is ≥90%.

[0011] Preferably, step four includes: feeding the rutile rough concentrate II obtained in step three into a screen plate electrostatic separator and an arc plate electrostatic separator in sequence to obtain the conductor product as rutile rough concentrate III.

[0012] Preferably, the TiO2 grade in the refined rutile concentrate obtained in step four is ≥90%, and the TiO2 recovery rate in this process is ≥90%.

[0013] As a preferred option, the rutile rough concentrate obtained in step four is fed into a roller-type high-intensity magnetic separator, with the magnetic field strength set at 1.0-2.0T and the drum speed at 20-40r / min, to obtain rutile concentrate.

[0014] Preferably, the rutile concentrate obtained by the roller-type high-intensity magnetic separator has a TiO2 grade of ≥90%, a ZrO2 grade of ≤1%, and a TiO2 comprehensive recovery rate of ≥70%.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows: (1) Existing technologies, such as single magnetic separation, single electro-separation, or magnetic separation followed by electro-separation, are prone to incomplete separation of rutile from impurity minerals. However, this invention, by first separating magnetic minerals and then performing multi-stage electro-separation and strong magnetic separation, can completely separate rutile from impurity minerals and improve the TiO2 grade and recovery rate in rutile concentrate. (2) The raw materials contain magnetic impurities. These magnetic impurities not only have magnetism, but also overlap with the conductivity of rutile due to the surface characteristics of the particles. If they directly enter the electrostatic separation, they will be judged as conductive products mixed in with rutile, resulting in a significant decrease in the electrostatic separation accuracy. Therefore, the present invention performs weak magnetic separation before multi-stage electrostatic separation to remove magnetic impurities, so that the raw materials entering the multi-stage electrostatic separation are only non-magnetic rutile rough concentrate, thereby enabling multi-stage electrostatic separation to achieve accurate separation purely by the difference in conductivity, ensuring the enrichment effect of multi-stage electrostatic separation from the source. (3) If magnetic impurities enter the multi-stage cylindrical electrostatic separation, they will gradually accumulate with the rutile conductor products. When they finally enter the strong magnetic separation stage, the types of impurities are more complex, that is, a mixture of magnetic and non-magnetic impurities. In this case, the strong magnetic separation needs to process multiple impurities at the same time, which may lead to incomplete separation or loss of rutile with the impurities. The present invention removes magnetic impurities first, so that only non-magnetic rutile rough concentrate needs to be processed in the subsequent process. This makes the target of the subsequent strong magnetic separation highly singular, targeting only the small amount of weak magnetic impurities remaining after multi-stage electrostatic separation, which greatly reduces the separation difficulty. (4) The multi-stage cylindrical electrostatic separation in this invention increases the TiO2 grade in non-magnetic rutile rough concentrate to ≥90% through gradient enrichment, while removing most of the non-magnetic impurities, so that the material entering the strong magnetic separation is only the high-grade rutile conductor product after electrostatic separation, and the processing volume is greatly reduced. (5) The presence of altered rutile in coastal placer deposits often forms intergrowths with zircon and quartz. If directly subjected to strong magnetic separation, the intergrowth particles will have uneven magnetic field action due to the coexistence of magnetic and non-magnetic parts, resulting in incomplete separation. However, this invention achieves precise separation of altered mineral particles through multi-stage electrostatic separation, ensuring the quality and recovery rate of rutile concentrate. When subjected to strong magnetic separation, the difference in magnetic field response between rutile monomers and weakly magnetic impurity monomers is more obvious, resulting in more thorough impurity separation. (6) Through screening, magnetic separation, multi-stage electric separation and strong magnetic separation, the final rutile concentrate TiO2 grade is ≥90%, which is much higher than the initial grade range of 40-90% of the raw material, meeting the application requirements of high-purity rutile. (7) The overall recovery rate of TiO2 is ≥70%, and the recovery rate of TiO2 is relatively stable; (8) Depending on the properties of the raw materials, steps such as magnetic separation, arc plate electric separation, and roller strong magnetic separation can be flexibly omitted; multi-stage electric separation can be repeated 1-2 times according to the purity of the product to achieve accurate sorting and avoid over-processing or incomplete sorting. (9) The purification method of the present invention does not involve complex chemical processing, but mainly physical sorting, which has low energy consumption, good environmental protection and high efficiency. (10) The high-grade rutile concentrate obtained through purification can be widely used in high-end fields such as titanium dioxide, special ceramics, and aerospace materials. Compared with low-grade raw materials, the added value of the products is significantly improved, providing an efficient path for the in-depth development of coastal sand resources. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below: Figure 1 The flowchart shows the beneficiation and purification method for rutile in coastal placer deposits provided in Example 1. Figure 2A detailed flowchart of the beneficiation and purification method for rutile in coastal placer deposits; Figure 3 The flowchart shows the beneficiation and purification method for rutile in coastal placer deposits provided in Example 2. Figure 4 The flowchart shows the beneficiation and purification method for rutile in coastal placer deposits provided in Example 3. Detailed Implementation

[0017] To better understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0019] Example 1 The following is in conjunction with the appendix Figure 1 and Figure 2 To further describe the present invention, a method for beneficiation and purification of rutile from coastal placer deposits is provided, such as... Figure 1 As shown, it includes the following steps: Step 1: Raw material processing; Step 2: Separate the magnetic minerals to obtain rutile rough concentrate 1; Step 3: Electrostatic separation yields conductor and non-conductor products; Step 4: Pass the conductor product through multi-stage electrostatic separation and strong magnetic separation to obtain rutile concentrate.

[0020] like Figure 2 As shown, the mineral composition of the raw material in step one is ilmenite, zircon, rutile, garnet and monazite, and the TiO2 grade in the raw material is 40-90%.

[0021] like Figure 2 As shown, the raw materials in step one need to be screened and separated through a 40-200 mesh sieve to remove coarse particles.

[0022] like Figure 2 As shown, step two includes: feeding the raw material processed in step one into a permanent magnet drum separator, setting the magnetic field strength to 0.4-0.9T and the drum speed to 20-40r / min, removing magnetic minerals, and obtaining a non-magnetic product, rutile rough concentrate.

[0023] like Figure 2As shown, step three includes: feeding the rutile rough concentrate obtained in step two into a cylindrical high-voltage electrostatic separator, setting the separation voltage to 20-40kV, the cylinder rotation speed to 100-300r / min, and obtaining the conductor product as rutile rough concentrate two.

[0024] like Figure 2 As shown, the TiO2 grade in the rutile rough concentrate 2 separated in step three is ≥80%, and the TiO2 recovery rate in this process is ≥90%.

[0025] like Figure 2 As shown, step four includes: feeding the rutile rough concentrate II obtained in step three into a screen plate electrostatic separator and an arc plate electrostatic separator in sequence to obtain the conductor product as rutile rough concentrate III.

[0026] like Figure 2 As shown, in step four, the TiO2 grade in the refined rutile concentrate is ≥90%, and the TiO2 recovery rate in this process is ≥90%.

[0027] like Figure 2 As shown, the rutile rough concentrate obtained in step four is fed into a roller-type high-intensity magnetic separator. The magnetic field strength is set to 1.0-2.0T and the drum speed is 20-40r / min to obtain rutile concentrate.

[0028] like Figure 2 As shown, the TiO2 grade in the rutile concentrate obtained by the roller high-intensity magnetic separator is ≥90%, the ZrO2 grade is ≤1%, and the overall TiO2 recovery rate is ≥70%.

[0029] In this embodiment, the raw materials in step one are the electrostatically separated conductor products from the zircon sand process of the coastal sand mine polymetallic integrated recycling and beneficiation plant, the second and third bucket materials of the shaking table, and various high-titanium mid- and tailing materials from the Jin Hong process, or a mixture of the above products.

[0030] In this embodiment, the permanent magnet drum separator is model CTGMΦ400, and the magnetic minerals removed are mainly ilmenite, garnet, or a small amount of monazite, pseudomorphic hematite, etc. However, when the raw material does not contain magnetic minerals such as ilmenite and garnet, step two can be omitted.

[0031] In this embodiment, the high-voltage drum electrostatic separator in step three is a YD series Φ270. This step is repeated 1-2 times depending on the purity of the separated conductor products.

[0032] In this embodiment, the sieve plate electrostatic separator in step four is a CRIMM series model. This sieve plate electrostatic separator can be repeatedly operated 1-2 times depending on the purity of the separated conductor products.

[0033] In this embodiment, the arc plate electrostatic separator in step four is a CRIMM series model, which is omitted based on the purity of the separated conductor products.

[0034] In this embodiment, the electrostatic separation step of the roller-type high-intensity magnetic separator can be omitted depending on the properties of the raw material.

[0035] In this embodiment, the non-conducting product obtained by the sieve plate electrostatic separator is mainly altered high-titanium minerals.

[0036] In this embodiment, the non-conducting products obtained by the arc plate electrostatic separator are mainly residual zircon and quartz sand.

[0037] In this embodiment, if the mineral composition of the raw material is ilmenite, zircon, rutile, zircon, etc., then the comprehensive recovery rate of rutile concentrate is ≥80%.

[0038] Example 2 The main difference between this embodiment and Embodiment 1 is: like Figure 3 As shown, step one: The coarse and fine coarse material of a coastal sand mine in Mozambique is passed through a 100-mesh sieve to remove coarse zircon particles and coarse sand. Step 2: The gold-red coarse and fine material from a coastal sand mine in Mozambique after screening is fed into a cylindrical high-voltage electrostatic separator. The separation voltage is set to 30kV and the cylinder rotation speed is 150r / min. Step 3: The conductor products separated by the cylindrical high-voltage electrostatic separator enter the sieve plate electrostatic separator to obtain rutile concentrate.

[0039] In this embodiment, the TiO2 grade in the raw material is 80.75%, the TiO2 grade in the conductor product obtained by the cylindrical high-voltage electrostatic separator is 93.61%, the TiO2 grade in the rutile concentrate obtained by the sieve plate electrostatic separator is 96.38%, and the overall TiO2 recovery rate is 91.99%.

[0040] In this embodiment, the steps for calculating the TiO2 recovery rate in rutile concentrate are as follows: The formula for calculating the recovery rate is: A = (B C) / (D) E) 100%, where A is TiO2 recovery rate, B is rutile concentrate yield, C is TiO2 grade in rutile concentrate, D is TiO2 grade in rutile rough, and E is rutile rough yield.

[0041] like Figure 3 As shown, B is 77.7%, C is 96.38%, D is 80.75%, E is 100%, and A is 91.99%.

[0042] Example 3 The main difference between this embodiment and Embodiment 1 is: like Figure 4 As shown, step one: The gold-red product obtained by the three buckets of shaking table material from a coastal sand mine in South Africa through traditional process is put into a cylindrical high-voltage electrostatic separator for electrostatic separation to obtain non-conductor, middlings and conductor products; Step 2: The middlings obtained in Step 1 are put back into a cylindrical high-voltage electrostatic separator for electrostatic separation to obtain non-conductor and conductor products; Step 3: Mix the conductor products obtained in Step 1 and Step 2 to obtain rutile concentrate.

[0043] In this embodiment, the TiO2 grade in the conductor product obtained in step two is 91.82%, and the ZrO2 grade is 0.89%.

[0044] In this embodiment, the TiO2 grade in the conductor product obtained in step three is 93.5%, and the ZrO2 grade is 0.6%.

[0045] As a technical solution of this invention, the provided hardware configuration is merely for facilitating the implementation of specific braking control based on the hardware facilities. How to specifically implement braking control and the braking control method are not the technical problems to be solved or the objects of protection of this invention. Furthermore, the communication methods between the devices all employ existing communication methods and are not the inventive point of this invention.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for beneficiation and purification of rutile in coastal placer deposits, characterized in that, Includes the following steps: Step 1: Raw material processing; Step 2: Separate the magnetic minerals to obtain rutile rough concentrate 1; Step 3: Electrostatic separation yields conductor and non-conductor products; Step 4: Pass the conductor product through multi-stage electrostatic separation and strong magnetic separation to obtain rutile concentrate.

2. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 1, characterized in that, The raw materials in step one contain ilmenite, zircon, rutile, garnet and monazite, and the TiO2 grade in the raw materials is 40-90%.

3. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 2, characterized in that, The raw materials in step one need to be screened and separated through a 40-200 mesh sieve to remove coarse particles.

4. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 1, characterized in that, Step two includes: feeding the raw material processed in step one into a permanent magnet drum separator, setting the magnetic field strength to 0.4-0.9T and the drum speed to 20-40r / min, removing magnetic minerals, and obtaining a non-magnetic product, rutile rough concentrate.

5. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 1, characterized in that, Step three includes: feeding the rutile rough concentrate obtained in step two into a cylindrical high-voltage electrostatic separator, setting the separation voltage to 20-40kV and the cylinder rotation speed to 100-300r / min, and obtaining the conductor product as rutile rough concentrate.

6. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 5, characterized in that, The TiO2 grade in the rutile rough concentrate separated in step three is ≥80%, and the TiO2 recovery rate in this process is ≥90%.

7. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 5, characterized in that, Step four includes: feeding the rutile rough concentrate II obtained in step three into a screen plate electrostatic separator and an arc plate electrostatic separator in sequence to obtain the conductor product as rutile rough concentrate III.

8. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 7, characterized in that, In step four, the TiO2 grade in the refined rutile concentrate is ≥90%, and the TiO2 recovery rate in this process is ≥90%.

9. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 7, characterized in that, The rutile rough concentrate obtained in step four is fed into a roller-type high-intensity magnetic separator. The magnetic field strength is set to 1.0-2.0T and the drum speed is 20-40r / min to obtain rutile concentrate.

10. The method for beneficiation and purification of rutile in coastal placer deposits according to claim 9, characterized in that, The rutile concentrate obtained by the roller-type high-intensity magnetic separator has a TiO2 grade of ≥90%, a ZrO2 grade of ≤1%, and a TiO2 comprehensive recovery rate of ≥70%.

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