CN114178041B - Method for recycling silicon and iron from iron tailings - Google Patents
Method for recycling silicon and iron from iron tailings Download PDFInfo
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- CN114178041B CN114178041B CN202111396860.8A CN202111396860A CN114178041B CN 114178041 B CN114178041 B CN 114178041B CN 202111396860 A CN202111396860 A CN 202111396860A CN 114178041 B CN114178041 B CN 114178041B
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- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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Abstract
The invention provides a method for recycling silicon and iron from iron tailings, which comprises the steps of pre-grading the iron tailings, carrying out primary grinding, primary grading, secondary grinding grading operation, tertiary grinding grading operation, primary weak magnetic operation, primary strong magnetic operation, secondary weak magnetic operation, secondary strong magnetic operation, tertiary weak magnetic operation, tertiary strong magnetic operation, four strong magnetic operation, roughing spiral chute, selecting spiral chute, scavenging spiral chute, coarse grain floatation operation, coarse grain leaching device, iron extraction floatation operation, fine grain floatation operation and fine grain leaching device to obtain floatation concentrate, high-purity silica micropowder product and coarse grain silica product. The invention can realize the high added value recycling of the iron tailings, recycle coarse-grain silica products, iron concentrate and high-purity silica micropowder products according to market demands, fully realize the efficient development and utilization of resources, and has important practical significance and strategic significance.
Description
Technical Field
The invention relates to the technical field of recycling materials in iron tailings, in particular to a method for recycling silicon and iron from the iron tailings.
Background
The main components in the iron tailings in the Anshan region are silicon and iron, the process for extracting the silicon and the iron from the iron tailings in the prior art generally only considers the purity of silicon dioxide (the purity is below 99.7 percent), the granularity of the silicon dioxide is not considered, the coarse fraction and the fine fraction of the obtained silicon dioxide product are mixed together, and the granularity grade is wider, so that the subsequent high-added-value utilization is not facilitated. A method for recovering quartz from iron tailings as in patent (CN 108636591 a) only considers purity but does not consider particle size; the method comprises the steps that silicon dioxide with the purity lower than 99.7% is obtained in a system for preparing high-purity silicon dioxide by using iron tailings (CN 208308443A); the method for recovering quartz in iron tailings according to the patent has a purity of less than 99.7% of silica obtained from quartz ore (CN 104190533A) prepared by the method, and the purity of the patent is less than 99.7%, and the granularity of the silica is not considered. The silicon dioxide products required by the market mainly comprise coarse-grain silicon dioxide (silicon dioxide purity is larger than or equal to 99%, granularity is larger than or equal to 44) and high-purity silicon dioxide micro powder (silicon dioxide purity is larger than or equal to 99.9%, granularity is smaller than or equal to 10), the demand of the existing market for the high-purity silicon dioxide micro powder (silicon dioxide purity is larger than or equal to 99.9%, granularity is smaller than 10 microns) is increased year by year, and particularly the silicon dioxide product is more prominent in the field of chip manufacturing, but the existing recovery technology only can obtain silicon dioxide with the highest purity of 99.7%, and the demand of the market cannot be met well.
The existing technology for recovering silicon and iron from iron tailings has low silicon recovery rate and high production cost, such as a system for preparing high-purity silicon dioxide from iron tailings (CN 208308443), and the silicon recovery rate only reaches 20%. According to the method (CN 108636591A) for recovering quartz from iron tailings, the iron tailings are subjected to strong magnetic roughing to obtain iron rough concentrate and quartz rough concentrate, the quartz rough concentrate is subjected to classification, ore grinding, flotation, roughing and multiple scavenging, strong magnetic refining and leaching to obtain quartz products with the grade of more than 99.7%, and the iron rough concentrate is used for extracting iron concentrate, and all the grain grades are subjected to ore grinding, so that the ore grinding cost is increased.
Disclosure of Invention
For the above reasons, a method for recovering silicon and iron from iron tailings is provided.
The invention adopts the following technical means:
a method for recovering silicon and iron from iron tailings, the components of the iron tailings including silicon and iron, the recovery method comprising:
pre-classifying the iron tailings into coarse-grain products (granularity is larger than or equal to 44 microns) and fine-grain products (granularity is smaller than 44 microns); the coarse grain product is subjected to primary grinding, the monomer dissociation degree of iron minerals and gangue minerals is improved, and then primary classification is carried out, so that a primary coarse grain product (granularity is larger than or equal to 44 microns) and a primary fine grain product (granularity is smaller than 44 microns) are obtained.
The primary coarse-grain product enters a roughing spiral chute to obtain coarse-spiral concentrate (the concentrate with more iron content) and coarse-spiral tailings (the tailings with less iron content) in the invention; feeding the coarse spiro concentrate into a concentrating spiral chute to obtain concentrate (for enriching iron) and concentrate tailings; the coarse conch ore enters a scavenging spiral chute to obtain scavenging conch ore concentrate and scavenging conch ore (enriching silicon).
Carrying out a section of weak magnetic operation on the conch tailing, and removing ferromagnetic iron minerals in the conch tailing to obtain first weak concentrate and first weak tailing; the first weak tailings are subjected to one-stage strong magnetic operation, most weak magnetic iron minerals in the first weak tailings are removed, so that first strong concentrate and first strong tailings are obtained, one-stage weak magnetic operation is adopted to remove the strong magnetic iron minerals before one-stage strong magnetic operation, the blockage of a medium box in the strong magnetic operation can be prevented, and the smooth operation of the strong magnetic operation is ensured; carrying out coarse-grain flotation operation on the first strong tailings to obtain coarse-grain floating concentrate and coarse-grain floating tailings; the coarse-grain floating tailings enter a coarse-grain leaching device, and impurities in the product are further removed through flotation and leaching operations, so that a coarse-grain silicon dioxide product is obtained, the purity of silicon dioxide in the coarse-grain silicon dioxide product is larger than or equal to 99%, and the granularity of the silicon dioxide in the coarse-grain silicon dioxide product is larger than or equal to 44 microns.
Carrying out two-stage weak magnetic operation on the fine grain product obtained by pre-grading and primary grading and the primary fine grain product to obtain second weak concentrate and second weak tailings; and carrying out two-stage strong magnetic operation on the second weak tailings to obtain second strong concentrate and second strong tailings.
Combining the second weak concentrate with the conch concentrate, performing two-stage grinding classification operation, and performing three-stage weak magnetic operation on the obtained secondary product to obtain a third weak concentrate and third weak tailings; performing three-section strong magnetic operation on the third weak tailings to obtain third strong concentrate and third strong tailings; and carrying out iron extraction and floatation operation on the mixed magnetic concentrate formed by the third weak concentrate and the third strong concentrate to obtain floatation concentrate, wherein the total iron grade in the floatation concentrate is not less than 64%.
Combining the second strong tailings and the third strong tailings, and then carrying out three-stage grinding classification operation, and carrying out four-stage strong magnetic operation on the obtained three-stage product to obtain fourth strong concentrate and fourth strong tailings; feeding the fourth strong tailings into fine-grain flotation operation to obtain fine-grain floating concentrate and fine-grain floating tailings; feeding the fine-grain floating tailings into a fine-grain leaching device to obtain a high-purity silica micropowder product, wherein the purity of silica in the high-purity silica micropowder product is greater than or equal to 99.9%; the granularity of the silicon dioxide in the high-purity silicon dioxide micropowder product is less than or equal to 10 micrometers.
Further, the conch tailings and the conch concentrate are combined into a gravity middling, and the gravity middling is returned to the pre-classification for operation again.
Further, a ball mill is adopted for the primary ore grinding equipment; the two-stage grinding and classifying operation and the three-stage grinding and classifying operation both adopt closed-circuit grinding, the grinding equipment adopts a tower mill, the classifying equipment adopts a cyclone, and the grinding medium of the three-stage grinding adopts ceramic balls or ceramic rods.
Further, cyclone and/or fine screen are adopted in advance classification, coarse grain products are arranged on the sand settling and/or fine screen of the cyclone, and fine grain products are arranged under overflow and/or fine screen.
The primary classification adopts a cyclone and/or a fine screen, coarse grain products are arranged on the cyclone sand setting and/or the fine screen, and fine grain products are arranged under overflow and/or the fine screen.
Further, the coarse grain leaching device and the fine grain leaching device are both assisted by ultrasound.
Further, a section of strong magnetic operation adopts a high-efficiency strong magnetic machine, and the magnetic induction intensity is 1500-3000 mT.
The two-stage strong magnetic operation and the three-stage strong magnetic operation adopt a vertical ring strong magnetic machine, and the magnetic induction intensity is 1000-1500 mT.
The four-section strong magnetic operation adopts a superconducting strong magnetic machine, and the magnetic induction intensity is 2000-5000 mT.
Further, each stage of flotation operation (coarse flotation operation, fine flotation operation and iron extraction flotation operation) in the invention can be formed by adopting roughing, selecting and multi-stage scavenging according to the ore properties.
In each process step of the invention, the product with higher iron content is called as 'concentrate', and the product with lower iron content is called as 'tailing'.
The iron tailings are subjected to preliminary classification to obtain a fine grain product with the granularity of less than 44 microns and a coarse grain product with the granularity of more than or equal to 44 microns, wherein the coarse grain product is subjected to primary grinding (ball milling) to improve the monomer dissociation degree of iron minerals and gangue minerals, and the primary coarse grain product with the granularity of more than or equal to 44 microns and the primary fine grain product with the granularity of less than 44 microns are obtained after secondary classification; the fine grain product and the primary fine grain product are subjected to three-stage grinding and grading operation to obtain a product with the granularity less than or equal to 10 microns, and the product with the granularity less than or equal to 10 microns is subjected to sorting to obtain a high-purity silica micropowder product; and (3) selecting the primary coarse-grain product with the granularity of more than or equal to 44 microns to obtain the coarse-grain silicon dioxide product. Meanwhile, the invention recovers coarse silica products and high-purity silica micropowder products and also recovers iron minerals.
In the recovery of the high-purity silica micropowder product, firstly, after a section of weak magnetic operation, the ferromagnetic iron mineral is removed, then, most of the ferromagnetic iron mineral is removed by combining standing ring strong magnetic (two-section strong magnetic operation) and superconducting strong magnetic (four-section strong magnetic operation), and finally, floatation and leaching operation are adopted to further remove impurities in the product, so that the purity of the silica can be obviously improved, and the purity is more than or equal to 99.9%. According to the invention, on the recycling of coarse-grain silicon dioxide products, one section of weak magnetic operation and one section of strong magnetic operation (high-efficiency strong magnetic operation) are adopted, and then flotation and leaching operations are carried out, so that the purity of the obtained product is larger than or equal to 99%.
The invention utilizes the iron tailings for recycling, the granularity of the iron tailings is between 0 and 100 microns, and a large amount of crushing and grinding cost is saved. The invention utilizes the fine snail concentrate, the first weak concentrate and the second weak concentrate generated in the process of recovering the high-purity silica micropowder product in the process of recovering the coarse-grained silica product to recover the iron mineral. The invention utilizes the third strong tailings generated during the recovery of the iron minerals in the process of recovering the high-purity silica micropowder product. In the process of recycling coarse-grained silicon dioxide products, the conch-sweeping concentrate and the fine-spiral tailing are combined and then returned to the pre-classification and re-operation. The method reasonably and efficiently utilizes the iron tailings, effectively recovers the iron minerals while the recovery rate of the silicon dioxide reaches 60%, and realizes the efficient and full utilization of resources.
Compared with the prior art, the invention has the following advantages:
1. the invention can realize the high added value recovery of the iron tailings, the recovery rate of the recovered coarse-grain silicon dioxide product (silicon dioxide purity is not less than 99%, granularity is not less than 44 microns), the high-purity silicon dioxide micro-powder product (silicon dioxide purity is not less than 99.9%, granularity is not more than 10 microns) and the iron concentrate (total iron grade is not less than 64%), and the recovery rate of the silicon dioxide reaches 60%, thereby realizing the efficient development and utilization of resources.
2. The method adopts weak magnetic separation before strong magnetic separation to prevent strong magnetic blockage, and reduces the iron content in strong magnetic ore feeding, thereby providing favorable conditions for obtaining high-purity silicon dioxide. The combination of strong magnetism and flotation technology can not only effectively reduce the iron content in silicon dioxide, but also remove other non-magnetic minerals.
3. The iron tailings can be subjected to pre-grading to obtain grain raw materials with different granularities, so that the grinding amount of one-stage grinding is reduced, the production cost is reduced, the dissociation degree of iron minerals and quartz is increased by one-stage grinding, and the ground materials are separated into primary coarse grain products and primary fine grain products through primary grading. Thus, the granularity level of the subsequent sorting operation is narrow, and a good sorting effect can be obtained.
4. The primary coarse grain products are suitable for being fed into a spiral chute for sorting because of the coarse grain size, the sorting cost is low, no pollution is caused, the ore in the re-sorting is returned to the pre-sorting operation, so that the continuous bodies can be further dissociated, meanwhile, as much coarse grain products as possible are obtained, the recovery rate of silicon dioxide can be increased, and the ore grinding cost is saved.
5. The secondary and tertiary grinding classification operation adopts closed circuit grinding, and the secondary and tertiary grinding equipment adopts tower grinding to obtain fine-granularity grinding products; ceramic balls are adopted as the grinding medium for three-stage grinding, so that iron balls or steel balls are prevented from being used as the grinding medium to increase the iron content in the silicon dioxide product.
6. The leaching operation of the coarse grain leaching device and the fine grain leaching device adopts ultrasonic assistance, so that the reagent consumption can be reduced, and the leaching speed can be improved.
Based on the reasons, the method can be widely popularized in the fields of iron tailing recovery and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for recovering silicon and iron from iron tailings in accordance with an embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In addition, the technical features are defined by terms such as "first", "second", etc., which are merely for convenience in distinguishing the corresponding technical features, and the terms have no special meaning unless otherwise stated, and thus should not be construed as limiting the scope of the present invention.
As shown in fig. 1, a method for recovering silicon and iron from iron tailings, wherein the components of the iron tailings comprise silicon and iron (the total iron grade in the iron tailings is 10.69%, the silicon dioxide content is 79.15%, and the particle size is less than or equal to 0 and less than 100 microns), and the recovery method comprises the following steps:
pre-classifying the iron tailings by a cyclone or a fine screen (325 meshes), wherein coarse-grain products (with granularity not less than 44 microns) on a sand setting or fine screen, and overflow or fine-grain products (with granularity less than 44 microns) under the fine screen; the coarse-grain product is subjected to primary grinding by adopting a ball mill, so as to improve the monomer dissociation degree of iron minerals and gangue minerals, the primary grinding is performed by adopting open-circuit grinding, and then primary classification is performed by adopting a cyclone or a fine screen, so that a primary coarse-grain product with the granularity of more than or equal to 44 microns and a primary fine-grain product with the granularity of less than 44 microns are obtained.
The primary coarse-grain product enters a roughing spiral chute to obtain coarse-spiral concentrate with more iron and coarse-spiral tailings with less iron (in the embodiment, the coarse-spiral concentrate with more iron and the coarse-spiral tailings with less iron in each working procedure are called as 'concentrate', and the coarse-spiral concentrate with less iron is called as 'tailings', which are not repeated later); feeding the coarse spiro concentrate into a concentrating spiral chute to obtain concentrate and tailings of the concentrate with the full iron grade of 33.26%; feeding the coarse conch tailings into a scavenging spiral chute to obtain scavenging conch concentrate and scavenging conch tailings; and combining the conch tailings and the conch concentrate to obtain a gravity concentrate, and returning to the pre-classification to perform the operation again.
Carrying out a section of weak magnetic operation on the conch tailing, and removing ferromagnetic iron minerals in the conch tailing to obtain first weak concentrate and first weak tailing; performing one-stage strong magnetic operation on the first weak tailings, and removing most weak magnetic iron minerals in the first weak tailings to obtain first strong concentrate and first strong tailings; carrying out coarse-grain flotation operation on the first strong tailings to obtain coarse-grain floating concentrate and coarse-grain floating tailings; the coarse grain floating tail enters a coarse grain leaching device to obtain a coarse grain silicon dioxide product; the purity of the silica in the coarse-grained silica product was 99.23%, and the particle size of the silica in the coarse-grained silica product was ≡ 44. Mu.m.
Carrying out second-stage weak magnetic operation on the fine grain product and the primary fine grain product to obtain second weak concentrate and second weak tailings; and carrying out two-stage strong magnetic operation on the second weak tailings to obtain second strong concentrate and second strong tailings.
The second weak concentrate and the fine spiral concentrate are combined and then subjected to secondary grinding classification operation, the secondary grinding classification operation is closed circuit grinding, cyclone is adopted for classification, tower grinding is adopted for grinding, and the obtained secondary product (secondary overflow product) is subjected to three-stage weak magnetic operation; obtaining third weak concentrate and third weak tailings; performing three-section strong magnetic operation on the third weak tailings to obtain third strong concentrate and third strong tailings; and carrying out iron extraction and floatation operation on the mixed magnetic concentrate formed by the third weak concentrate and the third strong concentrate to obtain floatation concentrate, wherein the total iron grade in the floatation concentrate is 64.35%.
The second strong tailings and the third strong tailings are combined and then subjected to three-section grinding classification operation, wherein the three-section grinding classification operation is closed-circuit grinding, cyclone is adopted for classification, tower grinding is adopted for grinding, ceramic balls or ceramic rods are adopted for grinding mediums, and the obtained three-time product (three-time overflow product) is subjected to four-section strong magnetic operation to obtain fourth strong concentrate and fourth strong tailings; feeding the fourth strong tailings into fine-grain flotation operation to obtain fine-grain floating concentrate and fine-grain floating tailings; and enabling the fine floating tailings to enter a fine leaching device to obtain a high-purity silica micropowder product. The purity of the silicon dioxide in the high-purity silicon dioxide micro powder product is 99.90 percent; the granularity of the silicon dioxide in the high-purity silicon dioxide micropowder product is less than or equal to 10 micrometers.
The coarse grain leaching device and the fine grain leaching device are both assisted by ultrasound, namely, leaching operation is carried out in an ultrasonic environment.
The magnetic induction intensity of the first-section weak magnetic operation, the second-section weak magnetic operation and the third-section weak magnetic operation is 200 mT to 400mT.
The first stage of strong magnetic operation adopts a high-efficiency strong magnetic machine, and the magnetic induction intensity is 1500-3000 mT.
The two-stage strong magnetic operation and the three-stage strong magnetic operation adopt a vertical ring strong magnetic machine, and the magnetic induction intensity is 1000-1500 mT.
The four-section strong magnetic operation adopts a superconducting strong magnetic machine, and the magnetic induction intensity is 2000-5000 mT.
In each step of this embodiment, the product having a high iron content is referred to as "concentrate", and the product having a low iron content is referred to as "tailings".
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A method for recovering silicon and iron from iron tailings, the components of the iron tailings including silicon and iron, the method comprising:
pre-grading the iron tailings to obtain coarse grain products and fine grain products; carrying out primary classification after carrying out primary grinding on the coarse grain product to obtain a primary coarse grain product and a primary fine grain product;
the primary coarse grain product enters a roughing spiral chute to obtain rough spiral concentrate and rough spiral tailings; the coarse spiro concentrate enters a concentrating spiral chute to obtain concentrate and tailings; the coarse conch tailings enter a scavenging spiral chute to obtain scavenging conch concentrate and scavenging conch tailings;
performing one-stage weak magnetic operation on the conch mine to obtain first weak concentrate and first weak tailings; performing one-section strong magnetic operation on the first weak tailings to obtain first strong concentrate and first strong tailings; coarse-grain flotation operation is carried out on the first strong tailings, so that coarse-grain floating concentrate and coarse-grain floating tailings are obtained; the coarse-grain floating tailings enter a coarse-grain leaching device to obtain a coarse-grain silicon dioxide product, wherein the purity of silicon dioxide in the coarse-grain silicon dioxide product is larger than or equal to 99%, and the granularity of silicon dioxide in the coarse-grain silicon dioxide product is larger than or equal to 44 microns;
carrying out two-stage weak magnetic operation on the fine grain product and the primary fine grain product to obtain second weak concentrate and second weak tailings; performing two-stage strong magnetic operation on the second weak tailings to obtain second strong concentrate and second strong tailings;
the second weak concentrate and the concentrate are combined and then subjected to secondary grinding classification operation, and the obtained secondary product is subjected to three-stage weak magnetic operation to obtain third weak concentrate and third weak tailings; performing three-section strong magnetic operation on the third weak tailings to obtain third strong concentrate and third strong tailings; carrying out iron extraction and floatation operation on the mixed magnetic concentrate formed by the third weak concentrate and the third strong concentrate to obtain floatation concentrate;
the second strong tailings and the third strong tailings are combined and then subjected to three-section grinding and grading operation, and the obtained three-time product is subjected to four-section strong magnetic operation to obtain fourth strong concentrate and fourth strong tailings; feeding the fourth strong tailings into fine-grain flotation operation to obtain fine-grain floating concentrate and fine-grain floating tailings; feeding the fine-grain floating tailings into a fine-grain leaching device to obtain a high-purity silica micropowder product, wherein the purity of silica in the high-purity silica micropowder product is not less than 99.9%; the granularity of the silicon dioxide in the high-purity silicon dioxide micro powder product is less than or equal to 10 microns.
2. A method for recovering silicon and iron from iron tailings according to claim 1, wherein the total iron grade in the flotation concentrate is ∈ 64%.
3. A method of recovering silicon and iron from iron tailings according to claim 1, wherein the concentrate and the scavenger concentrate are combined as a gravity concentrate, returned to the pre-classification for re-operation.
4. A method for recovering silicon and iron from iron tailings according to claim 1, wherein the primary grinding apparatus employs a ball mill; the two-stage grinding and classifying operation and the three-stage grinding and classifying operation both adopt closed-circuit grinding, the grinding equipment adopts a tower mill, the classifying equipment adopts a cyclone, and the grinding medium in the three-stage grinding and classifying operation adopts ceramic balls or ceramic rods.
5. A method for recovering silicon and iron from iron tailings according to claim 1, wherein the pre-classification employs a cyclone and/or fine screen with coarse product on the cyclone sand setting and/or fine screen and fine product under the overflow and/or fine screen;
the primary classification adopts a cyclone and/or a fine screen, coarse grain products are arranged on the sand setting and/or the fine screen of the cyclone, and fine grain products are arranged under overflow and/or the fine screen.
6. A method for recovering silicon and iron from iron tailings according to claim 1, wherein the coarse leaching apparatus and the fine leaching apparatus are both ultrasonically assisted.
7. The method for recycling silicon and iron from iron tailings according to claim 1, wherein the one section of strong magnetic operation adopts a high-efficiency strong magnetic machine, and the magnetic induction intensity is 1500-3000 mT;
the two-section strong magnetic operation and the three-section strong magnetic operation adopt a vertical ring strong magnetic machine, and the magnetic induction intensity is 1000-1500 mT;
the four-section strong magnetic operation adopts a superconducting strong magnetic machine, and the magnetic induction intensity is 2000-5000 mT.
8. A method for recovering silicon and iron from iron tailings according to claim 1, wherein the particle size of the fine product obtained by the pre-classification is less than 44 microns and the particle size of the coarse product is ∈ 44 microns.
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| PCT/CN2021/132786 WO2023092331A1 (en) | 2021-11-23 | 2021-11-24 | Method for recovering silicon and iron from iron tailings |
| AU2021475883A AU2021475883A1 (en) | 2021-11-23 | 2021-11-24 | Method for recovering silicon and iron from iron tailings |
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| AU2021475883A1 (en) | 2023-08-10 |
| CN114178041A (en) | 2022-03-15 |
| WO2023092331A1 (en) | 2023-06-01 |
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