Sorting system for removing shells in sea sand

Abstract

The utility model discloses a sorting system for removing shells in sea sand, and relates to the technical field of sea sand treatment. The sorting system comprises a pre-screening device, a wind power sorting device, a crushing sorting device and a first conveying assembly. The pre-screening device is used for receiving original sea sand containing sea sand and shells and screening the original sea sand into a first particle size part, a second particle size part, a third particle size part and a fourth particle size part of which the particle sizes are increased in sequence; the wind power sorting device is used for receiving the third particle size part and screening the third particle size part into a first screened-out part and a first remaining part of which the shell content is sequentially increased; the crushing and sorting device is used for receiving the second particle size part and screening the second particle size part into a second screened-out part and a second remaining part of which the shell content is sequentially increased; and the first conveying assembly is used for conveying the third particle size part to the wind power sorting device and conveying the second particle size part to the crushing sorting device. The method can effectively reduce the content of shells in the sea sand.

Description

Technical Field

[0001] This application relates to the field of marine sand treatment technology, and more specifically to a sorting system for removing seashells from marine sand. Background Technology

[0002] Sea sand has been used in construction both domestically and internationally for a long time. However, the presence of seashells in sea sand has become a major factor restricting its application. Because sea sand contains a large number of seashells, and these seashells have low strength, their subsequent use is severely affected.

[0003] The density of seashells is 2.86 g / cm³, while the density of sea sand is 2.78 g / cm³. Their densities are very close, making them difficult to separate using conventional methods. Existing sea sand and seashell separation technologies are insufficient to effectively reduce the seashell content in sea sand.

[0004] Therefore, how to effectively reduce the shell content in sea sand remains a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, in order to solve the above-mentioned technical problems, this application provides a sorting system for removing shells from sea sand, the sorting system comprising:

[0006] A pre-screening device is used to receive raw sea sand containing sea sand and shells, and screen the raw sea sand into a first particle size fraction, a second particle size fraction, a third particle size fraction, and a fourth particle size fraction with increasing particle size in sequence;

[0007] A wind-powered sorting device is used to receive the third particle size fraction and sieve it into a first screened-out fraction and a first remaining fraction, with the shell content increasing sequentially.

[0008] A crushing and sorting device is used to receive the second particle size fraction and screen the second particle size fraction into a second screened portion and a second remaining portion with increasing shell content.

[0009] And a first conveying assembly for conveying the third particle size portion to the wind-powered sorting device and the second particle size portion to the crushing and sorting device.

[0010] Beneficial Effects: Unlike existing technologies, this application utilizes a pre-screening device to separate the second and third particle sizes, which lie between the first and fourth particle sizes. Using a wind-powered separator to classify the larger third particle size effectively separates the flaky shells into the first remaining portion, thus retaining more sea sand in the first screened portion and increasing its sea sand content. Using a crushing and sorting device to classify the second particle size effectively crushes and sorts the shells into the second remaining portion, further retaining more sea sand in the second screened portion. Through this method, the first particle size, the first screened portion, and the second screened portion represent the high sea sand content, and by removing the fourth particle size, the first remaining portion, and the second remaining portion, shells can be effectively removed. This effectively reduces the shell content in the sea sand. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the sorting system of this application.

[0012] Explanation of reference numerals in the attached figures:

[0013] 10 sorting system; 100 pre-screening device; 200 air-powered sorting device; 300 crushing and sorting device; 400 conveying components; 500 mixing device; 20 sea sand stockpile; 30 raw sea sand; 40 mine cars;

[0014] First feeding area 101; First discharging area 102; Second discharging area 103; Third discharging area 104; Fourth discharging area 105; Second feeding area 201; Fifth discharging area 202; Sixth discharging area 203; Third feeding area 301; Seventh discharging area 302; Eighth discharging area 303;

[0015] Primary screening device 110; Ninth discharge zone 111; First screen 112; Second screen 113; Secondary screening device 120; Fourth feed zone 121; Third screen 122; Fourth conveying device 130; First conveying device 140;

[0016] Crushing device 310; Three-stage screening device 320; Fourth screen 321;

[0017] Second conveying device 410; Third conveying device 420; Fifth conveying device 610; Sixth conveying device 620; Seventh conveying device 630; Eighth conveying device 710; Finished sea sand storage 720; Ninth conveying device 810; Tenth conveying device 820; Eleventh conveying device 830; Shell storage 840. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In this application, each feeding area and discharging area is represented by a line segment with an arrow, wherein the direction in which the arrow points is the direction of material conveying.

[0020] Please see Figure 1 The sea sand sorting system 10 of this application for removing seashells includes a pre-screening device 100, a wind-powered sorting device 200, a crushing and sorting device 300, and a conveying assembly 400.

[0021] A pre-screening device 100 receives raw sea sand 30 containing sea sand and shells, and screens the raw sea sand 30 into a first particle size fraction, a second particle size fraction, a third particle size fraction, and a fourth particle size fraction in ascending order of particle size. An air-powered separator 200 receives the third particle size fraction and screens it into a first screened portion and a first remaining portion in ascending order of shell content. A crushing and separating device 300 receives the second particle size fraction and screens it into a second screened portion and a second remaining portion in ascending order of shell content. A conveying assembly 400 conveys the third particle size fraction to the air-powered separator 200 and the second particle size fraction to the crushing and separating device 300.

[0022] Through the above method, the pre-screening device 100 can separate the second and third particle sizes, which are located between the first and fourth particle sizes. The wind-powered sorting device 200 effectively separates the larger third particle size portion into the first remaining portion, thus retaining more sea sand in the first screened portion and increasing its sea sand content. The crushing and sorting device 300 effectively crushes and sorts the second particle size portion into the second remaining portion, further retaining more sea sand in the second screened portion. In this way, the first particle size portion, the first screened portion, and the second screened portion contain the highest sea sand content. By removing the fourth particle size portion, the first remaining portion, and the second remaining portion, the purpose of effectively removing seashells can be achieved. This effectively reduces the seashell content in the sea sand.

[0023] Optionally, such as Figure 1As shown, the pre-screening device 100 has a first feeding area 101, a first discharge area 102, a second discharge area 103, a third discharge area 104, and a fourth discharge area 105. The air-powered sorting device 200 has a second feeding area 201, a fifth discharge area 202, and a sixth discharge area 203. The crushing and sorting device 300 has a third feeding area 301, a seventh discharge area 302, and an eighth discharge area 303. The sorting system 10 includes a first conveying device 140, and the first conveying assembly 400 includes a second conveying device 410 and a third conveying device 420.

[0024] The first conveying device 140 extends to the first feeding area 101 for conveying raw sea sand 30 to the pre-screening device 100. The second conveying device 410 extends to the third discharge area 104 and the second feeding area 201 respectively for conveying the third particle size portion output from the third discharge area 104 to the air-powered separator 200. The third conveying device 420 extends to the second discharge area 103 and the third feeding area 301 respectively for conveying the second particle size portion output from the second discharge area 103 to the crushing and sorting device 300.

[0025] Specifically, the first discharge zone 102 outputs the first particle size fraction, and the fourth discharge zone 105 outputs the fourth particle size fraction. The fifth discharge zone 202 outputs the first sieved portion, and the sixth discharge zone 203 outputs the first remaining portion. The seventh discharge zone 302 outputs the second sieved portion, and the eighth discharge zone 303 outputs the second remaining portion.

[0026] The raw sea sand 30 in the sea sand stockpile 20 can be transported to the first conveying device 140 by the mine car 40, so that the first conveying device 140 can transport the raw sea sand 30 to the pre-screening device 100.

[0027] Optionally, such as Figure 1 As shown, the pre-screening device 100 includes a primary screening device 110, a secondary screening device 120, and a fourth conveying device 130.

[0028] The first feeding area 101, the first discharging area 102, and the fourth discharging area 105 are located in the primary screening device 110. The primary screening device 110 is provided with a ninth discharging area 111. The second discharging area 103 and the third discharging area 104 are located in the secondary screening device 120, which is provided with a fourth feeding area 121. The fourth conveying device 130 extends to both the ninth discharging area 111 and the fourth feeding area 121, and is used to convey the material output from the ninth discharging area 111 to the secondary screening device 120.

[0029] The primary screening device 110 is used to screen the raw sea sand 30 into a first particle size fraction, a first mixed fraction, and a fourth particle size fraction, with the first mixed fraction containing the second and third particle size fractions. The material output from the ninth discharge zone 111 is the first mixed fraction. The secondary screening device 120 is used to screen the first mixed fraction into a second and third particle size fraction, with the second and third particle size fractions, respectively, with increasing particle size.

[0030] Through the above method, the sea sand content in the first particle size fraction, the first mixed fraction, and the fourth particle size fraction decreases sequentially. Therefore, the first particle size fraction does not need further screening, while the first mixed fraction can be further screened in conjunction with the secondary screening device 120, the air separation device 200, and the crushing and separation device 300 to remove the first and second remaining fractions. Thus, the first particle size fraction, the first screened fraction, and the second screened fraction can be considered as fractions with higher sea sand content, effectively reducing the shell content in the sea sand.

[0031] Optionally, such as Figure 1 As shown, the crushing and sorting device 300 includes a crushing device 310 and a three-stage screening device 320.

[0032] The third feeding zone 301 is located within the crushing device 310. The crushing device 310 receives the second particle size fraction and crushes the shells in the second particle size fraction to form a pre-treatment section containing sea sand and crushed shells. The seventh discharge zone 302 and the eighth discharge zone 303 are located within the three-stage screening device 320. The three-stage screening device 320 is used to screen the pre-treatment section into a second screening portion and a second remaining portion.

[0033] Through the above method, because sea sand is harder than seashells, in the second particle size fraction, the sea sand is not easily crushed by the crushing device 310 and easily retains its original particle size, while the seashells are easily crushed into smaller fragments. Therefore, in the pretreatment section, the particle size of the seashells is smaller than that of the sea sand. Furthermore, the three-stage screening device 320 can further separate the sea sand and the crushed seashells in the pretreatment section, screening them into a second screening portion and a second remaining portion.

[0034] Optionally, such as Figure 1 As shown, the primary screening device 110 has a first screen 112 and a second screen 113, the secondary screening device 120 has a third screen 122, and the tertiary screening device 320 has a fourth screen 321.

[0035] The first screen 112 is used to separate the raw sea sand 30 into a fourth particle size fraction and a second mixed fraction, the second mixed fraction containing the first, second, and third particle size fractions. The second screen 113 is used to separate the second mixed fraction into a first particle size fraction and a first mixed fraction, the first mixed fraction containing the second and third particle size fractions. The third screen 122 is used to separate the first mixed fraction into a second and third particle size fraction. The fourth screen 321 has the same aperture as the second screen 113 and is used to separate the pre-treated portion into a second sieved portion and a second remaining portion.

[0036] By using the above method, the sea sand in the pretreatment section can be further separated from the crushed shells by using the fourth screen 321 with the same aperture as the second screen 113, so as to be screened into the second screened part and the second remaining part.

[0037] Optionally, such as Figure 1 As shown, the aperture of the first screen 112 is d1mm, the aperture of the second screen 113 is d2mm, the aperture of the third screen 122 is d3mm, and the aperture of the fourth screen 321 is d2mm.

[0038] Where 0 < d2 < d3 < d1, d2 ∈ [1.00, 1.40], d3 ∈ [2.00, 2.80], and d1 ∈ [4.50, 5.00].

[0039] For example, and not as a limitation, in one example, d2=1.18, d3=2.36, d1=4.75, but not limited to these. In another example, d2=1.40, d3=2.80, d1=5.00, but not limited to these. In yet another example, d2=1.00, d3=2.00, d1=4.50, but not limited to these.

[0040] Optionally, such as Figure 1 As shown, the primary screening device 110 is a double-vibrating drum screen, and the secondary screening device 120 and the tertiary screening device 320 are both vibrating screens, but are not limited to these. The cross-section of the drum of the double-vibrating drum screen is, but is not limited to, octagonal, circular or other polygonal.

[0041] Optionally, such as Figure 1 As shown, the sorting system 10 includes a mixing device 500, a fifth conveying device 610, a sixth conveying device 620, and a seventh conveying device 630.

[0042] The mixing device 500 receives and mixes the first particle size fraction, the first screened portion, and the second screened portion to obtain mixed sea sand. The fifth conveying device 610 extends to the first discharge area 102 and the mixing device 500, respectively, to convey the first particle size fraction to the mixing device 500. The sixth conveying device 620 extends to the fifth discharge area 202 and the mixing device 500, respectively, to convey the first screened portion to the mixing device 500. The seventh conveying device 630 extends to the seventh discharge area 302 and the mixing device 500, respectively, to convey the second screened portion to the mixing device 500.

[0043] By mixing the first particle size fraction, the first sieve fraction, and the second sieve fraction using the mixing device 500, a mixed sea sand with a preset fineness modulus can be obtained. In one example, the mixed sea sand can be used directly as finished sea sand; for example, the mixed sea sand can be conveyed to the finished sea sand storage silo 720 via the eighth conveying device 710. In another example, the mixed sea sand can be used as construction sand after dechlorination treatment.

[0044] Optionally, such as Figure 1 As shown, the sorting system 10 includes a ninth conveying device 810, a tenth conveying device 820, and an eleventh conveying device 830. The ninth conveying device 810 extends to the fourth discharge area 105 and the shell storage silo 840, respectively, for conveying the fourth particle size fraction to the shell storage silo 840. The tenth conveying device 820 extends to the sixth discharge area 203 and the shell storage silo 840, respectively, for conveying the first remaining fraction to the shell storage silo 840. The eleventh conveying device 830 extends to the eighth discharge area 303 and the shell storage silo 840, respectively, for conveying the second remaining fraction to the shell storage silo 840.

[0045] In this way, the fourth particle size portion, the first remaining portion, and the second remaining portion, as the portions with the highest shell content, can be transported to the shell storage silo 840 for later use.

[0046] Optionally, such as Figure 1 As shown, any one of the first conveying device 140 to the fourth conveying device 130 can be one or more of a belt conveyor, scraper conveyor, screw conveyor, and bucket elevator. The fifth conveying device 610 can be one or more of a belt conveyor, scraper conveyor, screw conveyor, bucket elevator, and pneumatic conveyor. Any one of the sixth conveying device 620 to the eleventh conveying device 830 can be one or more of a belt conveyor, scraper conveyor, screw conveyor, and bucket elevator.

[0047] The sorting method of the sorting system 10 of this application will be described below through specific embodiments, such as the aperture of the first screen 112 being 4.75 mm, the aperture of the second screen 113 being 1.18 mm, the aperture of the third screen 122 being 2.36 mm, and the aperture of the fourth screen 321 being 1.18 mm. Specific implementation examples:

[0049] The sorting method of the sorting system 10 includes a first screen 112 screening step, a second screen 113 screening step, a third screen 122 screening step, a wind-powered sorting device 200 sorting step, a crushing device 310 crushing step, a fourth screen 321 screening step, and a mixing device 500 mixing step.

[0050] The first screen 112 screening steps: The first screen 112 with an aperture of 4.75mm screens the original sea sand 30 into a fourth particle size part with a particle size > 4.75mm and a second mixed part with a particle size ≤ 4.75mm.

[0051] The second mixing portion, with a particle size ≤ 4.75 mm, is mixed with a first particle size portion with a particle size < 1.18 mm, a second particle size portion with a particle size ≤ 1.18 mm and a particle size < 2.36 mm, and a third particle size portion with a particle size ≤ 2.36 mm and a particle size ≤ 4.75 mm.

[0052] The second screen 113 screening steps: The second screen 113 with an aperture of 1.18 mm screens the second mixed part with a particle size ≤ 4.75 mm into a first particle size part with a particle size < 1.18 mm and a first mixed part with a particle size ≤ 1.18 mm and a particle size ≤ 4.75 mm.

[0053] The mixture consists of a first part with a particle size of 1.18mm ≤ particle size ≤ 4.75mm, a second part with a particle size of 1.18mm ≤ particle size < 2.36mm, and a third part with a particle size of 2.36mm ≤ particle size ≤ 4.75mm. Testing revealed that the shell content of the first part (particle size < 1.18mm) was < 3%.

[0054] The third screen 122 screening steps: The third screen 122 with an aperture of 2.36mm screens the first mixed part with a particle size of 1.18mm≤particle size≤4.75mm into a second part with a particle size of 1.18mm≤particle size<2.36mm and a third part with a particle size of 2.36mm≤particle size≤4.75mm.

[0055] The sorting steps of the wind-powered sorting device 200 are as follows: The wind-powered sorting device 200 screens the third particle size portion of 2.36mm≤particle size≤4.75mm into the first screened portion of 2.36mm≤particle size≤4.75mm with increasing shell content and the first remaining portion of 2.36mm≤particle size≤4.75mm.

[0056] Crushing steps of crushing device 310: Crushing device 310 crushes the shells in the second particle size range of 1.18mm≤particle size<2.36mm to form a pre-treatment section containing sea sand and crushed shells.

[0057] The pretreatment section contains a mixture of sea sand with a particle size of 1.18 mm to 2.36 mm and seashells with a particle size of 1.18 mm.

[0058] The fourth screen 321 screening steps: The fourth screen 321 with an aperture of 1.18mm screens the pre-treated part into a second screening part with a particle size of 1.18mm ≤ particle size < 2.36mm and a second remaining part with a particle size < 1.18mm.

[0059] The fourth screen 321 can, as far as possible, separate sea sand with a particle size of 1.18mm ≤ particle size < 2.36mm into the second screening portion (1.18mm ≤ particle size < 2.36mm), and also separate seashells with a particle size < 1.18mm into the second remaining portion. Testing showed that the seashell content in the second screening portion (1.18mm ≤ particle size < 2.36mm) was < 3%.

[0060] Mixing steps of mixing device 500: Mixing device 500 mixes the first particle size portion with a particle size < 1.18 mm, the first screened portion with a particle size ≤ 2.36 mm ≤ 4.75 mm, and the second screened portion with a particle size ≤ 1.18 mm < 2.36 mm to form mixed sea sand.

[0061] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A sorting system for removing seashells from sea sand, characterized in that, The sorting system includes: A pre-screening device is used to receive raw sea sand containing sea sand and shells, and screen the raw sea sand into a first particle size portion, a second particle size portion, a third particle size portion and a fourth particle size portion with increasing particle size in sequence; A wind-powered sorting device is used to receive the third particle size fraction and sieve the third particle size fraction into a first sieved portion and a first remaining portion with the shell content increasing sequentially. A crushing and sorting device is used to receive the second particle size fraction and screen the second particle size fraction into a second screened portion and a second remaining portion with the shell content increasing in sequence. and a first conveying assembly for conveying the third particle size portion to the wind-powered sorting device and the second particle size portion to the crushing and sorting device.

2. The sorting system according to claim 1, characterized in that, The pre-screening device has a first feeding area, a first discharging area, a second discharging area, a third discharging area, and a fourth discharging area; the air-powered sorting device has a second feeding area, a fifth discharging area, and a sixth discharging area; the crushing and sorting device has a third feeding area, a seventh discharging area, and an eighth discharging area; the first conveying assembly includes: The second conveying device extends to the third discharge area and the second feed area respectively, and is used to convey the third particle size portion output from the third discharge area to the wind-powered sorting device. And a third conveying device, which extends to the second discharge area and the third feed area respectively, for conveying the second particle size portion output from the second discharge area to the crushing and sorting device; Wherein, the first discharge area is used to output the first particle size portion, the fourth discharge area is used to output the fourth particle size portion; the fifth discharge area is used to output the first screened portion, the sixth discharge area is used to output the first remaining portion; the seventh discharge area is used to output the second screened portion, and the eighth discharge area is used to output the second remaining portion.

3. The sorting system according to claim 2, characterized in that, The pre-screening device includes: A primary screening device, wherein a first feeding area, a first discharging area, and a fourth discharging area are disposed in the primary screening device; the primary screening device is provided with a ninth discharging area; A secondary screening device, wherein the second discharge area and the third discharge area are disposed in the secondary screening device, and the secondary screening device is provided with a fourth feed area; And a fourth conveying device, which extends to the ninth discharge area and the fourth feed area respectively, for conveying the material output from the ninth discharge area to the secondary screening device; The primary screening device is used to screen the raw sea sand into a first particle size portion, a first mixed portion, and a fourth particle size portion, with the particle size increasing sequentially. The first mixed portion is mixed with the second particle size portion and the third particle size portion. The material output from the ninth discharge area is the first mixed portion. The secondary screening device is used to screen the first mixed portion into the second particle size portion and the third particle size portion, with the particle size increasing sequentially.

4. The sorting system according to claim 3, characterized in that, The crushing and sorting device includes: A crushing device, wherein the third feeding area is disposed in the crushing device; the crushing device is used to receive the second particle size portion and crush the shells in the second particle size portion to form a pre-treatment portion containing sea sand and crushed shells; The device includes a three-stage screening unit, wherein the seventh discharge area and the eighth discharge area are located within the three-stage screening unit; the three-stage screening unit is used to screen the pretreatment portion into the second screened portion and the second remaining portion.

5. The sorting system according to claim 4, characterized in that, The primary screening device has a first screen and a second screen, the secondary screening device has a third screen, and the tertiary screening device has a fourth screen. The first screen is used to sieve the raw sea sand into the fourth particle size part and the second mixed part, the second mixed part being a mixture of the first particle size part, the second particle size part and the third particle size part; The second screen is used to sieve the second mixed portion into the first particle size portion and the first mixed portion, wherein the first mixed portion contains the second particle size portion and the third particle size portion; The third screen is used to sieve the first mixed portion into the second particle size portion and the third particle size portion; The fourth screen has the same aperture as the second screen and is used to sieve the pre-processed portion into the second screened portion and the second remaining portion.

6. The sorting system according to claim 5, characterized in that, The aperture of the first screen is d1mm, the aperture of the second screen is d2mm, the aperture of the third screen is d3mm, and the aperture of the fourth screen is d2mm. Where 0 < d2 < d3 < d1, d2 ∈ [1.00, 1.40], d3 ∈ [2.00, 2.80], and d1 ∈ [4.50, 5.00].

7. The sorting system according to claim 6, characterized in that, d2=1.18, d3=2.36, d1=4.

75.

8. The sorting system according to claim 5, characterized in that, The primary screening device is a double-vibrating drum screen, and the secondary and tertiary screening devices are both vibrating screens.

9. The sorting system according to claim 2, characterized in that, The sorting system includes: A mixing device is used to receive and mix the first particle size fraction, the first sieved fraction, and the second sieved fraction to obtain mixed sea sand.

10. The sorting system according to claim 9, characterized in that, The sorting system includes: The fifth conveying device extends to the first discharge area and the mixing device respectively, and is used to convey the first particle size portion to the mixing device; The sixth conveying device extends to the fifth discharge area and the mixing device respectively, and is used to convey the first screened portion to the mixing device; A seventh conveying device extends to both the seventh discharge area and the mixing device, and is used to convey the second screened portion to the mixing device.

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