CN116603972B - Regeneration and selection process for Baozhu sand - Google Patents
Regeneration and selection process for Baozhu sand Download PDFInfo
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- CN116603972B CN116603972B CN202310889296.6A CN202310889296A CN116603972B CN 116603972 B CN116603972 B CN 116603972B CN 202310889296 A CN202310889296 A CN 202310889296A CN 116603972 B CN116603972 B CN 116603972B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02W30/62—Plastics recycling; Rubber recycling
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Abstract
The invention relates to the technical field of casting material treatment, in particular to a process for regenerating and carefully selecting Baozhu sand, which sequentially comprises the following steps: s1, demolding: demolding the waste sand, and removing mud in the waste sand; s2, roasting: roasting the demolded waste sand, and removing resin and coal dust in the waste sand; s3, strong magnetic separation: carrying out strong magnetic separation on the roasted waste sand with the magnetic field intensity of more than or equal to 15000Gs, sucking out the precious sand, iron powder and sintered silica sand in the waste sand, and simultaneously attaching part of silica sand; s4, carrying out low-intensity magnetic separation: performing weak magnetic separation on the mixture selected by strong magnetism with the magnetic field intensity of 1500Gs to 1800Gs to remove iron powder in the mixture; s5, carefully selecting: and (3) concentrating the mixture obtained by the low-intensity magnetic separation to obtain the Baozhu sand. The process for regenerating and carefully selecting the baozzle sand can realize the recycling of the baozzle sand so as to meet the larger demand of the baozzle sand.
Description
Technical Field
The invention relates to the technical field of casting material treatment, in particular to a process for regenerating and carefully selecting Baozhu sand.
Background
The Baozhu sand, which is known as 'molten ceramic sand', has the advantages of high temperature resistance, no crushing, no dust, sphericity, high air permeability, good filling property, no silicon dust hazard and the like, and is green casting environment-friendly sand.
The main components of the Baozhu sand comprise aluminum oxide, silicon dioxide, ferric oxide, titanium dioxide and the like, and the Baozhu sand is commonly used for manufacturing oil ducts such as engine cylinders, cylinder covers and the like, water jackets and sand cores of thin-wall castings so as to solve the problem of sintering; the precoated sand used in the hot core box is also added with unequal proportion of precious sand.
After casting is completed, the foundry sand enters a waste sand system. For this kind of waste sand, the existing treatment modes are: as solid waste treatment or magnetic separation of iron powder in the waste sand, the residual waste sand is directly used after being regenerated by adopting a thermal method or a thermal wet method, and the recovery and the utilization of the precious sand are not carried out. But the price of the precious sand is more than 10 times of that of the common silica sand, the annual demand in China is about 25 ten thousand tons, and the economic and environmental protection values can be brought by recycling. Therefore, a process for regenerating and refining the baozzle sand is needed.
Disclosure of Invention
The invention provides a process for regenerating and carefully selecting the foundry sand, which aims to solve the technical problem of recycling the foundry sand in the existing waste sand.
The invention provides a process for regenerating and carefully selecting Baozhu sand, which comprises the following steps:
s1, demolding: demolding the waste sand, and removing mud in the waste sand;
s2, roasting: roasting the demolded waste sand, and removing resin and coal dust in the waste sand;
s3, strong magnetic separation: carrying out strong magnetic separation on the roasted waste sand with the magnetic field intensity of more than or equal to 15000Gs, sucking out the precious sand, iron powder and sintered silica sand in the waste sand, and simultaneously attaching part of silica sand;
s4, carrying out low-intensity magnetic separation: performing weak magnetic separation on the mixture selected by strong magnetism with the magnetic field intensity of 1500Gs to 1800Gs to remove iron powder in the mixture;
s5, carefully selecting: and (3) concentrating the mixture obtained by the low-intensity magnetic separation to obtain the Baozhu sand.
Optionally, in step S1, the waste sand sequentially passes through two stripper machines to complete the secondary stripping.
Optionally, in step S3, the roasted waste sand is subjected to strong magnetic separation by using a belt type strong magnetic separator, wherein the magnetic field intensity of a magnetic roller used by the belt type strong magnetic separator is greater than or equal to 15000Gs.
Optionally, the belt strong magnetic separator is equipped with two at least and is the upper and lower stream and distributes, and every belt strong magnetic separator all includes magnet separator body and vibration chute, the vibration chute is the U type groove structure that web and two pterygoid lamina are constituteed, and the material gets into the magnet separator body through the vibration chute, and the non-magnetic material export of upstream magnet separator body corresponds the setting with the entry of adjacent low-reaches vibration chute.
Optionally, be equipped with the sand blocking board in the vibration chute, the sand blocking board with the web of vibration chute is perpendicular, the sand blocking board with form the clearance that is suitable for letting the material pass through between the web of vibration chute, sand blocking board height-adjustable.
Optionally, a plurality of sand guide blocks are arranged on the web plate of the vibration chute, and the plurality of sand guide blocks are distributed at intervals along the width direction of the vibration chute.
Optionally, in step S4, a belt type weak magnetic separator is used to perform weak magnetic separation on the mixture subjected to strong magnetic separation, and the magnetic field strength of a magnetic roller used by the belt type weak magnetic separator is between 1500Gs and 1800Gs.
Optionally, in step S5, the mixture obtained by the weak magnetic separation is carefully selected by using a specific gravity concentrator, where the specific gravity concentrator is provided with a first group of outlets, a second group of outlets and a third group of outlets with sequentially increased purity of the baozzle sand, the baozzle sand selected from the first group of outlets is used as common sand, the baozzle sand selected from the second group of outlets is returned to the inlet of the specific gravity concentrator for carefully selecting again, and the baozzle sand selected from the third group of outlets is collected as a finished product.
Optionally, a screening step is added between the step S3 and the step S4: and (3) carrying out vibration screening on the mixture selected by the strong magnet to remove impurities in the mixture.
Optionally, a water washing step is added after the step S5: and (3) washing the refined pearl sand to obtain regenerated refined pearl sand.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
according to the process for regenerating and carefully selecting the precious sand, mud in the waste sand is removed through demolding, resin and coal dust in the waste sand are removed through roasting, the precious sand, iron powder and sintered silica sand are screened out through strong magnetic separation, and the precious sand is screened out through carefully selecting. The method can realize recycling of the baozzle sand so as to meet the larger demand of the baozzle sand. In addition, after demolding and roasting the waste sand, the method utilizes the weak magnetism of the sand, and separates out the sand, iron powder and sintered silica sand as much as possible through strong magnetism, and although the magnetic roller is also accompanied with part of silica sand, the amount of the part of silica sand is greatly reduced relative to the amount of silica sand in the initial waste sand, and meanwhile, the sand in the initial waste sand can be basically separated out through strong magnetism, so that the selection efficiency of the sand can be greatly improved during subsequent selection, and the production process requirement can be met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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 to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 shows a schematic diagram of an apparatus for high intensity magnetic separation in an embodiment of the present invention;
FIG. 2 is a schematic top view of a vibratory chute according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of equipment used in the screening, low intensity magnetic separation and beneficiation steps in an embodiment of the present invention.
In the figure:
1. a magnetic separator body; 11. a non-magnetic material outlet; 12. a magnetic material outlet; 2. vibrating the chute; 21. a web; 211. a sand guide block; 22. a wing plate; 221. a connecting plate; 3. a sand baffle; 4. a belt type weak magnetic separator; 5. a specific gravity concentrator; 6. feeding a hopper; 7. a vibratory screening machine; 8. bucket elevator.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the invention.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In one embodiment, the process for regenerating and refining the baozzle sand sequentially comprises the following steps: demoulding, roasting, strong magnetic separation, weak magnetic separation and concentration.
S1, demolding: demolding the waste sand, and removing mud in the waste sand.
It is easy to understand that the demolding is completed in the demolding machine operation, and the main purpose is to remove the mud in the waste sand so as to avoid the interference of the mud to the subsequent process.
Further, the waste sand sequentially passes through two demolding machines to finish secondary demolding. Through secondary demoulding, mud in the waste sand can be removed more thoroughly.
S2, roasting: roasting the demolded waste sand, and removing resin and coal dust in the waste sand.
It is easy to understand that the roasting is performed in a roasting furnace, and the main purpose of the roasting is to remove resin and coal dust in the waste sand so as to avoid the interference of the resin and the coal dust on the subsequent process.
Specifically, the roasting temperature is controlled to 590 ℃ to 610 ℃, and the roasting temperature can be 590 ℃, 600 ℃ or 610 ℃.
S3, strong magnetic separation: and (3) carrying out high-intensity magnetic separation on the roasted waste sand with the magnetic field intensity of more than or equal to 15000Gs, sucking out the precious sand, iron powder and sintered silica sand in the waste sand, and simultaneously adding part of silica sand.
It is noted that, through experimental observation, when the magnetic field strength is 12000Gs, the weakly magnetic baozzle sand can be sucked. In order to improve the recovery rate of the baozzle sand, the higher the magnetic field strength is, the better the magnetic field strength is. When the magnetic separation strength reaches 15000GS, the recovery rate of the baozhu sand can reach the production requirement, so the method requires that the magnetic field strength of the strong magnetic separation is larger than or equal to 15000GS.
Specifically, the calcined waste sand was subjected to strong magnetic separation at a magnetic field strength of 15000Gs. The highest magnetic field intensity of the magnetic separation structure in the current market is 16000Gs, but when 16000Gs are adopted, the production process has high precision requirement and high price, so the embodiment combines the factors, and the magnetic field intensity of 15000Gs is selected for high-intensity magnetic separation. In other embodiments, if the cost factor is not considered, the magnetic field intensity of 16000Gs can be selected for high-intensity magnetic separation.
Specifically, the calcined waste sand is subjected to strong magnetic separation by using a belt type strong magnetic separator, and the magnetic field intensity of a magnetic roller used by the belt type strong magnetic separator is larger than or equal to 15000Gs. It is easy to understand that the belt type strong magnetic separator comprises a magnetic roller and a magnetic permeable belt wound around the periphery of the magnetic roller, the magnetic roller is generally arranged according to the volume and the magnetic poles, and is made of common magnet blocks in a combined mode, and then stainless steel without magnetism is wrapped around the periphery of the magnetic roller. The belt type strong magnetic separator has low manufacturing difficulty and convenient operation. In other embodiments, the pipeline permanent magnet iron remover can also be used for carrying out strong magnetic separation on the roasted waste sand.
More specifically, the belt type strong magnetic separator is provided with at least two belt type strong magnetic separators which are distributed in the upstream and downstream directions, each belt type strong magnetic separator comprises a magnetic separator body 1 and a vibrating chute 2, the vibrating chute 2 is of a U-shaped groove structure formed by a web 21 and two wing plates 22, materials enter the magnetic separator body 1 through the vibrating chute 2, and a non-magnetic material outlet 11 of the upstream magnetic separator body 1 is correspondingly arranged with an inlet of an adjacent downstream vibrating chute 2.
It is easy to understand that the vibrating chute 2, i.e. the trough-like structure with the vibrator, can realize the vibratory feeding of the vibrating chute 2 by the vibration of the vibrator, thereby making the feeding more uniform.
In detail, referring to fig. 1, the belt type strong magnetic separator is provided with two belt type strong magnetic separators which are arranged up and down, the vibrating chute 2 of the upper Fang Daishi strong magnetic separator receives the roasted waste sand, the material output by the non-magnetic material outlet 11 of the upper magnetic separator body 1 enters the vibrating chute 2 of the lower belt type strong magnetic separator to carry out secondary strong magnetic separation, and the materials output by the magnetic material outlets 12 of the two belt type strong magnetic separators all flow into a weak magnetic procedure to carry out weak magnetic separation, and the materials output by the non-magnetic material outlets 11 of the lower magnetic separator body 1 are collected and then used as common sand. Of course, as an alternative embodiment, the belt type strong magnetic separator may be provided with three or more and distributed upstream and downstream.
The two or more belt type strong magnetic separators can be used for completing the two-stage or multi-stage strong magnetic separation of the roasted waste sand, so that the waste sand can be sucked out as much as possible, and the recovery rate of the waste sand is further improved.
Further, referring to fig. 2, a sand baffle 3 is provided in the vibration chute 2, the sand baffle 3 is perpendicular to the web 21 of the vibration chute 2, a gap suitable for passing materials is formed between the sand baffle 3 and the web 21 of the vibration chute 2, and the height of the sand baffle 3 is adjustable.
Specifically, referring to fig. 2, two wing plates 22 of the vibration chute 2 are provided with a connecting plate 221, a plurality of mounting holes are formed in the connecting plate 221 along the groove depth direction of the vibration chute 2, two ends of the sand baffle 3 are fixed on the wing plates 22 of the vibration chute 2 through bolts penetrating through the mounting holes, and the height of the sand baffle 3 is adjusted by penetrating the bolts into the mounting holes at different heights. As an alternative embodiment, a chute arranged along the depth direction of the chute is formed inside two wing plates 22 of the vibrating chute 2, two ends of the sand baffle 3 are arranged in the chute, the height of the sand baffle 3 is adjusted by sliding the sand baffle 3 along the chute, jackscrews are screwed at positions, corresponding to the chute, on the outer sides of the wing plates 22 of the vibrating chute 2, and the sand baffle 3 is fixed in the chute by abutting the jackscrews against the sand baffle 3.
Through the height adjustment of the sand baffle 3, the height of the gap between the sand baffle 3 and the web 21 of the vibration chute 2 can be adjusted, so that the thickness of the material passing through the gap is adjusted, and the precious sand can be sucked out from the waste sand as much as possible under the premise of ensuring the production efficiency.
Further, referring to fig. 2, a plurality of sand guide blocks 211 are provided on the web 21 of the vibration chute 2, and the plurality of sand guide blocks 211 are distributed at intervals in the width direction of the vibration chute 2.
As described above, the magnetic rollers of the belt type strong magnetic separator are generally assembled by using common magnet blocks according to the volume and the arrangement of magnetic poles, and then are made of stainless steel by wrapping the periphery of the magnet blocks. Adjacent common magnet blocks attract each other at the joint, and the magnetism is strongest. The sand guide block 211 can guide the waste sand to pass through the place with the strongest magnetism so as to improve the recovery rate of the baozzle sand.
S4, carrying out low-intensity magnetic separation: and carrying out weak magnetic separation on the mixture selected by strong magnetism with the magnetic field intensity of 1500Gs to 1800Gs to remove iron powder in the mixture.
It should be noted that, through experimental observation, when the magnetic field strength is 1800Gs, the baozzle sand cannot be absorbed, and when the magnetic field strength is 1500Gs, the absorption efficiency of the iron powder can meet the production requirement, so the method requires the magnetic field strength of weak magnetic separation to be between 1500Gs and 1800Gs.
Specifically, referring to fig. 3, the mixture subjected to strong magnetic separation is subjected to weak magnetic separation by using a belt type weak magnetic separator 4, and the magnetic field strength of a magnetic drum used for the belt type weak magnetic separator 4 is between 1500Gs and 1800Gs. The belt type weak magnetic separator 4 has low manufacturing difficulty and convenient operation. In other embodiments, the mixture selected by the strong magnetism can be subjected to weak magnetic separation by adopting a pipeline permanent magnet iron remover.
S5, carefully selecting: and (3) concentrating the mixture obtained by the low-intensity magnetic separation to obtain the Baozhu sand.
Specifically, referring to fig. 3, the mixture obtained by the low-intensity magnetic separation is concentrated by using a gravity concentrator 5, the gravity concentrator 5 is provided with a first group of outlets, a second group of outlets and a third group of outlets, the purity of the baozzle sand is sequentially increased, the baozzle sand selected from the first group of outlets is used as common sand, the baozzle sand selected from the second group of outlets is returned to the inlet of the gravity concentrator 5 to be concentrated again, and the baozzle sand selected from the third group of outlets is collected as a finished product.
More specifically, this embodiment employs a waste sand concentrator used in the patent with publication number CN217369171U, which is provided with ten outlets, and for convenience of explanation, the ten outlets are named as a first outlet, a second outlet …, a first group of outlets from the first outlet to the third outlet, a second group of outlets from the fourth outlet to the seventh outlet, and a third group of outlets from the eighth outlet to the tenth outlet in this order from low purity of the baozhu sand. As an alternative embodiment, the gravity concentrator 5 may also employ a baozhu sand screening device as used in the patent with publication No. CN 210730890U.
The efficiency of fine selection of the baozzle sand can be ensured by directly using the baozzle sand selected from the first group of outlets as common sand; the yield of the baozzle sand can be improved by returning the second group of outlets to the inlet of the gravity concentrator 5 for concentration again; the purity of the baozzle sand can be ensured by collecting the baozzle sand selected from the third group of outlets as a finished product.
According to the process for regenerating and carefully selecting the precious sand, mud in the waste sand is removed through demolding, resin and coal dust in the waste sand are removed through roasting, the precious sand, iron powder and sintered silica sand are screened out through strong magnetic separation, and the precious sand is screened out through carefully selecting. The method can realize recycling of the baozzle sand so as to meet the larger demand of the baozzle sand. In addition, after demolding and roasting the waste sand, the invention utilizes the weak magnetism of the sand, and separates out the sand, iron powder and sintered silica sand as much as possible through strong magnetism, and although the magnetic roller is also accompanied with part of silica sand, the amount of the part of silica sand is greatly reduced relative to the amount of silica sand in the initial waste sand, and meanwhile, the sand in the initial waste sand can be basically separated out through strong magnetism, so that the selection efficiency of the sand can be greatly improved during subsequent selection, and the production process requirement can be met.
In some embodiments, referring to fig. 3, a screening step is added between step S3 and step S4: and (3) carrying out vibration screening on the mixture selected by the strong magnetism so as to remove impurities in the mixture, thereby avoiding the influence of the impurities on the subsequent weak magnetic separation or selection.
Specifically, the mixture selected by the strong magnetism is subjected to vibration screening by using a vibration screening machine 7.
In specific implementation, referring to fig. 3, the mixture selected by strong magnetism sequentially passes through a feeding hopper 6, a vibration screening machine 7 and a bucket elevator 8 to enter a belt type weak magnetic separator 4, after iron powder is screened by weak magnetic separation, the rest materials enter a specific gravity fine separator 5 for fine separation.
In some embodiments, a water washing step is added after step S5: and (3) washing the refined pearl sand to obtain regenerated refined pearl sand.
Specifically, the washing step comprises the steps of washing by a water wiper, dehydrating by a dehydrator, drying by a drying roller, cooling by a boiling cooling bed, and finally entering a finished sand bin through a sand generating tank.
The effectiveness of the water wash is demonstrated in connection with a set of experiments:
selecting the Baozhu sand obtained in the step S5, adding 1.4% of resin, wherein the initial strength of the prepared sand core is 1.7MPa, and the strength after 24 hours is 3.05MPa; the ball sand obtained after the water washing step is selected, 1.4% of resin is added, and the initial strength of the prepared sand core is 2.1MPa, and the strength after 24 hours is 3.1MPa.
Therefore, after the selected Baozhu sand is washed by water, not only can the surface dust be removed and the visible brightness be improved, but also the strength of the manufactured sand core can be improved.
The foregoing is merely exemplary of embodiments of the present invention to enable those skilled in the art to understand or practice the invention. Although 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 embodiments, and they should be construed as covering the scope of the appended claims.
Claims (2)
1. The process for regenerating and carefully selecting the baozhu sand is characterized by comprising the following steps of:
s1, demolding: demolding the waste sand, and removing mud in the waste sand; sequentially passing the waste sand through two demolding machines to finish secondary demolding;
s2, roasting: roasting the demolded waste sand, and removing resin and coal dust in the waste sand;
s3, strong magnetic separation: carrying out strong magnetic separation on the roasted waste sand with the magnetic field intensity of more than or equal to 15000Gs, sucking out iron powder, sintered silica sand and weakly magnetic precious sand in the waste sand, and simultaneously attaching part of silica sand; carrying out strong magnetic separation on the roasted waste sand by adopting a belt type strong magnetic separator, wherein the belt type strong magnetic separator comprises a magnetic roller and a magnetic permeable belt wound on the periphery of the magnetic roller, and the magnetic field intensity of the magnetic roller used by the belt type strong magnetic separator is larger than or equal to 15000Gs; the belt type strong magnetic separators are provided with two belt type strong magnetic separators which are distributed in the upstream and downstream directions, each belt type strong magnetic separator comprises a magnetic separator body (1) and a vibrating chute (2), the vibrating chute (2) is of a U-shaped groove structure formed by a web plate (21) and two wing plates (22), materials enter the magnetic separator body (1) through the vibrating chute (2), a non-magnetic material outlet (11) of the upstream magnetic separator body (1) is correspondingly arranged with an inlet of an adjacent downstream vibrating chute (2), the belt type strong magnetic separators are provided with two belt type strong magnetic separators which are arranged in the up-down direction, the vibrating chute (2) of each upper Fang Daishi strong magnetic separator receives roasted waste sand, the materials output by the non-magnetic material outlet (11) of the upper magnetic separator body (1) enter the vibrating chute (2) of the lower belt type strong magnetic separator to carry out secondary strong magnetic separation, and the materials output by the magnetic material outlets (12) of the two belt type strong magnetic separators all flow into a weak magnetic process to carry out weak magnetic separation, and the materials output by the non-magnetic material outlet (11) of the lower magnetic separator body (1) are collected and used as ordinary sand; the vibrating chute (2) is internally provided with a sand baffle (3), the sand baffle (3) is vertical to a web plate (21) of the vibrating chute (2), a gap suitable for materials to pass through is formed between the sand baffle (3) and the web plate (21) of the vibrating chute (2), the height of the sand baffle (3) is adjustable, two wing plates (22) of the vibrating chute (2) are both provided with connecting plates (221), a plurality of mounting holes are formed in the connecting plates (221) along the groove depth direction of the vibrating chute (2), two ends of the sand baffle (3) are fixed on the wing plates (22) of the vibrating chute (2) through bolts penetrating through the mounting holes, and the height adjustment of the sand baffle (3) is realized by penetrating the bolts into the mounting holes with different heights; a plurality of sand guide blocks (211) are arranged on a web plate (21) of the vibration chute (2), the sand guide blocks (211) are distributed at intervals along the width direction of the vibration chute (2), and the sand guide blocks (211) guide waste sand to pass through the place with the strongest magnetism so as to improve the recovery rate of the precious sand;
vibrating and screening the mixture selected by the strong magnet to remove impurities in the mixture;
s4, carrying out low-intensity magnetic separation: performing weak magnetic separation on the mixture selected by strong magnetism with the magnetic field intensity of 1800Gs to remove iron powder in the mixture;
s5, carefully selecting: the mixture obtained by the low-intensity magnetic separation is carefully chosen to obtain the baozzle sand, a specific gravity finely choosing machine (5) is adopted to finely choose the mixture obtained by the low-intensity magnetic separation, the specific gravity finely choosing machine (5) is provided with a first group of outlets, a second group of outlets and a third group of outlets, the baozzle sand chosen from the first group of outlets is used as common sand, the baozzle sand chosen from the second group of outlets is returned to the inlet of the specific gravity finely choosing machine (5) to be finely chosen again, and the baozzle sand chosen from the third group of outlets is collected as finished products;
s6, washing: and (3) washing the refined pearl sand to obtain regenerated refined pearl sand.
2. The process for regenerating and refining the baozzle sand according to claim 1 is characterized in that in the step S4, a belt type weak magnetic separator (4) is adopted to carry out weak magnetic separation on the mixture subjected to strong magnetic separation, and the magnetic field strength of a magnetic roller used by the belt type weak magnetic separator (4) is 1800Gs.
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