CN114178041A - Method for recovering silicon and iron from iron tailings - Google Patents
Method for recovering silicon and iron from iron tailings Download PDFInfo
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- CN114178041A CN114178041A CN202111396860.8A CN202111396860A CN114178041A CN 114178041 A CN114178041 A CN 114178041A CN 202111396860 A CN202111396860 A CN 202111396860A CN 114178041 A CN114178041 A CN 114178041A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
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- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/18—Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
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- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
Abstract
The invention provides a method for recovering silicon and iron from iron tailings, wherein the components of the iron tailings comprise silicon and iron, and the recovery method comprises the steps of pre-grading the iron tailings, primary grinding, primary grading, secondary grinding and grading, three-stage grinding and grading, one-stage weak magnetic operation, one-stage strong magnetic operation, two-stage weak magnetic operation, two-stage strong magnetic operation, three-stage weak magnetic operation, three-stage strong magnetic operation, four-stage strong magnetic operation, roughing spiral chute, fine selection spiral chute, scavenging spiral chute, coarse grain flotation operation, coarse grain leaching device, iron extraction flotation operation, fine grain flotation operation and fine grain leaching device to obtain flotation concentrate, high-purity silicon dioxide micropowder products and coarse grain silicon dioxide products. The invention can realize the high value-added recycling of the iron tailings, recover coarse-grained silicon dioxide products, iron ore concentrate and high-purity silicon dioxide micro powder products according to market demands, fully realize the high-efficiency development and utilization of resources, and has important practical significance and strategic significance.
Description
Technical Field
The invention relates to the technical field of materials recovered from iron tailings, in particular to a method for recovering silicon and iron from the iron tailings.
Background
The main components of the iron tailings in the Anshan area 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 less than 99.7%), does not consider the granularity of the silicon dioxide, the coarse fraction and the fine fraction of the obtained silicon dioxide product are mixed together, and the granularity level is wide and is not beneficial to the utilization of subsequent high added values. For example, the patent discloses a method (CN108636591A) for recovering quartz from iron tailings, which only considers purity, but does not consider particle size; for example, in a system (CN208308443A) for preparing high-purity silicon dioxide by using iron tailings, silicon dioxide with the purity of less than 99.7 percent is obtained; for example, in a patent, the purity of silica obtained in a method for recovering quartz in iron tailings and quartz ore (CN 104190533A) prepared by the method is lower than 99.7%, and the purity of the above patent is lower than 99.7%, and the particle size of the silica is not considered. The silicon dioxide products in market demand are mainly coarse-grained silicon dioxide (the purity of silicon dioxide is greater than or equal to 99%, the particle size is greater than or equal to 44) and high-purity silicon dioxide micro powder (the purity of silicon dioxide is greater than or equal to 99.9%, and the particle size is less than or equal to 10%), the demand of the market for the high-purity silicon dioxide micro powder (the purity of silicon dioxide is greater than 99.9%, and the particle size is less than or equal to 10 micrometers) is increased year by year, and the demand is particularly more prominent in the field of chip manufacturing, but the current recovery technology can only obtain silicon dioxide with the highest purity of 99.7%, and cannot well meet the market demand.
The existing technology for recovering silicon and iron from iron tailings has low silicon recovery rate and high production cost, and for example, in a system (CN208308443) for preparing high-purity silicon dioxide from iron tailings, the silicon recovery rate only reaches 20%. For example, in the patent, a method (CN108636591A) for recovering quartz from iron tailings is disclosed, wherein 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 scavenging for multiple times, strong magnetic concentration and leaching to obtain a quartz product with a grade of more than 99.7%, and the iron rough concentrate is used for extracting iron concentrate, and the iron rough concentrate is subjected to ore grinding by using all grain fractions, 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 technical means adopted by the invention are as follows:
a process for recovering silicon and iron from iron tailings, the constituents of the iron tailings comprising silicon and iron, the recovery process comprising:
pre-classifying the iron tailings into coarse grain products (the particle size is larger than or equal to 44 microns) and fine grain products (the particle size is smaller than 44 microns); and (3) grinding the coarse grain product for the first time to improve the monomer dissociation degree of the iron mineral and the gangue mineral, and then carrying out primary classification to obtain a primary coarse grain product (the grain size is larger than and equal to 44 microns) and a primary fine grain product (the grain size is smaller than 44 microns).
The primary coarse grain product enters a roughing spiral chute to obtain coarse snail concentrate (the concentrate containing more iron is called as "concentrate") and coarse snail tailings (the tailings containing less iron are called as "tailings"); the coarse snail concentrate enters a fine spiral chute to obtain fine snail concentrate (enriching iron) and fine snail tailings; and (4) feeding the crude snail tailings into a scavenging spiral chute to obtain scavenging snail concentrates and scavenging snail tailings (for enriching silicon).
Performing a section of weak magnetic operation on the snail scavenging tailings, and removing strong magnetic iron minerals in the snail scavenging tailings to obtain first weak concentrate and first weak tailings; the first weak tailings are subjected to a section of strong magnetic operation to remove most weak magnetic iron minerals in the first weak tailings to obtain first strong concentrate and first strong tailings, and the strong magnetic iron minerals are removed by adopting a section of weak magnetic operation before the section of strong magnetic operation, so that the medium box can be prevented from being blocked in the strong magnetic operation, and the smooth strong magnetic operation is ensured; performing coarse flotation operation on the first strong tailings to obtain coarse flotation concentrate and coarse flotation tailings; and (3) enabling the coarse-grained float tailings to enter a coarse-grained leaching device, and further removing impurities in the product through flotation and leaching operations to obtain a coarse-grained silicon dioxide product, wherein the purity of silicon dioxide in the coarse-grained silicon dioxide product is not less than 99%, and the particle size of the silicon dioxide in the coarse-grained silicon dioxide product is not less than 44 microns.
Carrying out secondary weak magnetic operation on fine grain products obtained by pre-grading and primary fine grain products 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 two-stage ore grinding grading operation, and the obtained secondary product is subjected to three-stage weak magnetic operation to obtain a third weak concentrate and a third weak tailing; carrying out three-stage strong magnetic operation on the third weak tailings to obtain third strong concentrate and third strong tailings; and carrying out iron extraction flotation operation on the mixed magnetic concentrate formed by the third weak concentrate and the third strong concentrate to obtain flotation concentrate, wherein the total iron grade in the flotation concentrate is not less than 64%.
Combining the second strong tailings and the third strong tailings, and then carrying out three-section grinding and grading operation, and carrying out four-section strong magnetic operation on the obtained three-section product to obtain fourth strong concentrate and fourth strong tailings; feeding the fourth strong tailings into fine flotation operation to obtain fine flotation concentrate and fine flotation tailings; feeding the fine-particle floating tailings into a fine-particle leaching device to obtain a high-purity silicon dioxide micro-powder product, wherein the purity of silicon dioxide in the high-purity silicon dioxide micro-powder 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.
And further, combining the refined snail tailings and the snail sweeping concentrates into gravity middlings, and returning to the pre-grading for operation again.
Further, the first-stage ore grinding equipment adopts a ball mill; the two-stage ore grinding grading operation and the three-stage ore grinding grading operation both adopt closed circuit ore grinding, the ore grinding equipment adopts a tower mill, the grading equipment adopts a swirler, and the ore grinding medium of the three-stage ore grinding adopts ceramic balls or ceramic rods.
Furthermore, a cyclone and/or a fine screen are adopted for pre-classification, coarse products are arranged on the sand settling and/or fine screen of the cyclone, and fine products are arranged below the overflow and/or fine screen.
The primary classification adopts a cyclone and/or a fine screen, primary coarse grain products are arranged on the sand settling and/or fine screen of the cyclone, and primary fine grain products are arranged under the overflow and/or fine screen.
Furthermore, the coarse grain leaching device and the fine grain leaching device are both assisted by ultrasound.
Furthermore, a high-efficiency strong magnetic machine is adopted in one-stage strong magnetic operation, 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 section of flotation operation (coarse flotation operation, fine flotation operation and iron extraction flotation operation) can be formed by adopting roughing, concentrating and multi-section scavenging according to the ore property.
In each process of the invention, the product with high iron content is called 'concentrate', and the product with low iron content is called 'tailing'.
The iron tailings are subjected to pre-classification to obtain a fine grain product with the particle size less than 44 microns and a coarse grain product with the particle size greater than or equal to 44 microns, the coarse grain product is subjected to primary grinding (ball milling) to improve the monomer dissociation degree of iron minerals and gangue minerals, and a primary coarse grain product with the particle size greater than or equal to 44 microns and a primary fine grain product with the particle size less than or equal to 44 microns are obtained after primary classification; carrying out three-stage ore grinding and grading operation on the fine grain product and the primary fine grain product to obtain a product with the granularity of less than or equal to 10 microns, and sorting the product with the granularity of less than or equal to 10 microns to obtain a high-purity silicon dioxide micro powder product; and (3) sorting the primary coarse-grained product with the particle size not smaller than 44 microns to obtain a coarse-grained silicon dioxide product. Meanwhile, the invention recovers the iron mineral while recovering the coarse-grained silicon dioxide product and the high-purity silicon dioxide micro powder product.
According to the invention, on the recovery of a high-purity silicon dioxide micro powder product, firstly, after a first-stage weak magnetic operation, strong magnetic iron minerals are removed, then, a vertical ring strong magnetic operation (a second-stage strong magnetic operation) and a superconducting strong magnetic operation (a fourth-stage strong magnetic operation) are combined to remove most of the weak magnetic iron minerals, and finally, flotation and leaching operations are adopted to further remove impurities in the product, so that the purity of silicon dioxide can be obviously improved, and the silicon dioxide can meet the requirement that the purity is not less than 99.9%. In the invention, on the recovery of coarse-grained silicon dioxide products, one-stage weak magnetic operation and one-stage 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 products is not less than 99%.
The invention utilizes the iron tailings for recovery, 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 spiral concentrate, the first weak concentrate and the second weak concentrate generated in the process of recovering the high-purity silicon dioxide micropowder product in the process of recovering the coarse-grain silicon dioxide product to recover iron minerals. In the process of recovering the high-purity silicon dioxide micropowder product, the third strong tailings generated in the process of recovering iron minerals are utilized. In the process of recovering coarse-grained silicon dioxide products, the snail sweeping concentrate and the snail concentrate are merged and then returned to the previous classification for re-operation. The method reasonably and efficiently utilizes the iron tailings, effectively recovers iron minerals while the recovery rate of the silicon dioxide reaches 60%, and realizes efficient and full utilization of resources.
Compared with the prior art, the invention has the following advantages:
1. the method can realize high value-added recovery of the iron tailings, the recovered coarse-grained silicon dioxide products (the purity of silicon dioxide is greater than or equal to 99%, and the particle size is greater than or equal to 44 micrometers), the high-purity silicon dioxide micro powder products (the purity of silicon dioxide is greater than or equal to 99.9%, and the particle size is less than or equal to 10 micrometers) and the iron ore concentrate (the total iron grade is greater than or equal to 64%), the recovery rate of silicon dioxide reaches 60%, and efficient development and utilization of resources are realized.
2. The weak magnetic separation is adopted before the strong magnetism, so that the strong magnetism is prevented from being blocked, the iron content in the strong magnetism feeding ore is reduced, and favorable conditions are provided for obtaining high-purity silicon dioxide. The combination of strong magnetism and flotation process can effectively reduce the iron content in the silicon dioxide and remove other nonmagnetic minerals.
3. The iron tailings can be subjected to pre-classification to obtain granular raw materials with different particle sizes, the ore grinding amount of the first-stage ore grinding is reduced, the production cost is reduced, the dissociation degree of iron minerals and quartz is increased by the first-stage ore grinding, and the materials after the ore grinding are divided into a primary coarse grain product and a primary fine grain product through primary classification. Thus, the granularity level of the subsequent sorting operation is narrow, and a better sorting effect can be obtained.
4. The primary coarse grain products are suitable for being fed into the spiral chute for sorting due to the coarse grain size, the sorting cost is low, no pollution is caused, the intergrowth can be further dissociated by re-selecting middlings and returning to the pre-grading operation, meanwhile, the coarse grain products as much as possible are obtained, the recovery rate of silicon dioxide can be increased, and the ore grinding cost is saved.
5. Closed circuit grinding is adopted in the second-stage and third-stage grinding grading operation, and the second-stage and third-stage grinding equipment adopts a tower mill to obtain ground ore products with fine granularity; the grinding medium of the three-stage grinding adopts ceramic balls, 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 to reduce the dosage of reagents and improve the leaching speed.
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 used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow diagram of a process for recovering silicon and iron from iron tailings in an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the 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 particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
It should be noted that the terms "first", "second", and the like are used to define the technical features, and are only used for convenience of distinguishing the corresponding technical features, and the terms have no special meanings unless otherwise stated, so that the scope of the present invention is not to be construed as being limited.
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 content of silicon dioxide is 79.15%, and the particle size < 0 > is less than or equal to 100 microns), and the recovery method comprises the following steps:
pre-classifying the iron tailings through a cyclone or a fine screen (325 meshes), wherein coarse grain products (the particle size is larger than or equal to 44 microns) are on the settled sand or the fine screen, and fine grain products (the particle size is smaller than 44 microns) are under the overflow or the fine screen; and grinding the coarse grain products for the first section by adopting a ball mill to improve the monomer dissociation degree of iron minerals and gangue minerals, grinding the coarse grain products for the first section by adopting an open circuit, and then carrying out primary classification by adopting a cyclone or a fine screen to obtain primary coarse grain products with the particle size not less than 44 micrometers and primary fine grain products with the particle size not less than 44 micrometers.
The primary coarse product enters a roughing spiral chute to obtain a coarse snail concentrate containing more iron and coarse snail tailings containing less iron (in the embodiment, the coarse snail concentrate containing more iron and the coarse snail tailings containing less iron in each process are referred to as "concentrate", and the coarse snail tailings containing less iron are referred to as "tailings", which are not repeated hereinafter); the coarse snail concentrate enters a fine spiral chute to obtain fine snail concentrate and fine snail tailings with the total iron grade of 33.26 percent; the crude snail tailings enter a scavenging spiral chute to obtain a scavenging snail concentrate and scavenging snail tailings; and combining the refined snail tailings and the snail sweeping concentrates into gravity middlings, and returning to the pre-grading for operation again.
Performing a section of weak magnetic operation on the snail scavenging tailings, and removing strong magnetic iron minerals in the snail scavenging tailings to obtain first weak concentrate and first weak tailings; performing a section of strong magnetic operation on the first weak tailings to remove most weak magnetic iron minerals in the first weak tailings to obtain first strong concentrate and first strong tailings; performing coarse flotation operation on the first strong tailings to obtain coarse flotation concentrate and coarse flotation tailings; the coarse particle floating tail enters a coarse particle leaching device to obtain a coarse particle silicon dioxide product; the purity of the silicon dioxide in the coarse-grained silicon dioxide product is 99.23%, and the particle size of the silicon dioxide in the coarse-grained silicon dioxide product is not less than 44 microns.
Performing 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; 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 refined spiral concentrate are combined and then subjected to secondary grinding grading operation, the secondary grinding grading operation is closed circuit grinding, a cyclone is adopted for grading, a tower mill is adopted for grinding, and the obtained secondary product (secondary overflow product) is subjected to three-section weak magnetic operation; obtaining third weak concentrate and third weak tailings; carrying out three-stage strong magnetic operation on the third weak tailings to obtain third strong concentrate and third strong tailings; and carrying out iron extraction flotation operation on the mixed magnetic concentrate formed by the third weak concentrate and the third strong concentrate to obtain flotation concentrate, wherein the total iron grade in the flotation concentrate is 64.35%.
Combining the second strong tailings and the third strong tailings, and then carrying out three-stage grinding classification operation, wherein the three-stage grinding classification operation is closed circuit grinding, a cyclone is adopted for classification, a tower mill is adopted for grinding, ceramic balls or ceramic rods are adopted for grinding media, and four-stage strong magnetic operation is carried out on the obtained tertiary product (tertiary overflow product) to obtain fourth strong concentrate and fourth strong tailings; feeding the fourth strong tailings into fine flotation operation to obtain fine flotation concentrate and fine flotation tailings; and (4) enabling the fine-grained floating tailings to enter a fine-grained leaching device to obtain a high-purity silicon dioxide micro powder 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 micro powder product is less than or equal to 10 microns.
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-stage weak magnetic operation, the second-stage weak magnetic operation and the third-stage weak magnetic operation is 200-400 mT.
One-stage 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 "tailing".
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A process for the recovery of silicon and iron from iron tailings, the constituents of which include silicon and iron, the recovery process comprising:
pre-grading the iron tailings to obtain coarse grain products and fine grain products; performing primary classification on the coarse grain product after primary ore grinding 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 coarse snail concentrate and coarse snail tailings; the coarse snail concentrate enters a fine spiral chute to obtain fine snail concentrate and fine snail tailings; the coarse snail tailings enter a scavenging spiral chute to obtain a scavenging snail concentrate and scavenging snail tailings;
performing a section of weak magnetic operation on the snail scavenging tailings to obtain first weak concentrate and first weak tailings; performing a section of strong magnetic operation on the first weak tailings to obtain first strong concentrate and first strong tailings; performing coarse flotation operation on the first strong tailings to obtain coarse flotation concentrate and coarse flotation tailings; the coarse-grained floating tailings enter a coarse-grained leaching device to obtain a coarse-grained silicon dioxide product, wherein the purity of silicon dioxide in the coarse-grained silicon dioxide product is larger than or equal to 99%, and the particle size of silicon dioxide in the coarse-grained silicon dioxide product is larger than or equal to 44 microns;
performing secondary 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 fine spiral concentrate are combined and then subjected to secondary grinding grading operation, and the obtained secondary product is subjected to three-stage weak magnetic operation to obtain a third weak concentrate and a third weak tailing; carrying out three-stage strong magnetic operation on the third weak tailings to obtain third strong concentrate and third strong tailings; carrying out iron extraction flotation operation on the mixed magnetic concentrate formed by the third weak concentrate and the third strong concentrate to obtain flotation concentrate;
combining the second strong tailings and the third strong tailings, and then carrying out three-section grinding and grading operation, and carrying out four-section strong magnetic operation on the obtained three-section product to obtain fourth strong concentrate and fourth strong tailings; feeding the fourth strong tailings into fine flotation operation to obtain fine flotation concentrate and fine flotation tailings; feeding the fine-particle floating tailings into a fine-particle leaching device to obtain a high-purity silicon dioxide micro powder product, wherein the purity of silicon dioxide in the high-purity silicon dioxide micro powder 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. The method of claim 1, wherein the flotation concentrate has an overall iron grade of 64% or higher.
3. The method for recovering silicon and iron from iron tailings of claim 1, wherein the fine spiral tailings and the sweep spiral concentrate are combined into gravity middlings, returned to the pre-classification and reused.
4. The method for recovering silicon and iron from iron tailings according to claim 1, wherein the primary grinding equipment adopts a ball mill; the two-stage ore grinding grading operation and the three-stage ore grinding grading operation both adopt closed circuit ore grinding, the ore grinding equipment adopts a tower mill, the grading equipment adopts a swirler, and the ore grinding medium in the three-stage ore grinding grading operation adopts ceramic balls or ceramic rods.
5. The method for recovering silicon and iron from iron tailings according to claim 1, wherein the pre-classification adopts a cyclone and/or a fine screen, coarse products are obtained on the screen of the cyclone, and fine products are obtained under the screen of the overflow and/or the fine screen;
the primary classification adopts a cyclone and/or a fine screen, primary coarse grain products are arranged on the upper part of the cyclone sand setting and/or fine screen, and primary fine grain products are arranged on the lower part of the overflow and/or fine screen.
6. The method for recovering silicon and iron from iron tailings of claim 1 wherein the coarse leaching unit and the fine leaching unit are both ultrasonically assisted.
7. The method for recovering silicon and iron from iron tailings according to claim 1, wherein a high-efficiency strong magnetic machine is adopted for the first-stage strong magnetic operation, 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.
8. The method of claim 1, wherein the pre-classified fine product has a particle size of less than 44 microns, and the coarse product has a particle size of greater than 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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| WO2023092331A1 (en) | 2023-06-01 |
| CN114178041B (en) | 2023-09-12 |
| AU2021475883A1 (en) | 2023-08-10 |
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