A full-process resource-based sea sand dechlorination and impurity removal system

Abstract

The invention discloses a full-process resource-based sea sand dechlorination and impurity removal system, including a screening unit, a cleaning and rinsing unit, an impurity separation unit, an ultrasonic generator, an alkaline potential water generator, a low-pressure ozone generation array stack, a linear vibration transmission water screening unit, a flocculation tank, a filter press, a water collection tank, a reverse osmosis treatment tank, a sun-evaporator and a concentrated brine collection unit, and also includes a caulking brick production unit and a mixing water collection unit. The system has good dechlorination and impurity removal effects on sea sand, and the chlorine content of the treated sea sand can be reduced to 0.0015%, and there is no permanent slow release of chloride ions, reaching and exceeding the standard of freshwater sand; the waste liquid and solid waste generated during the operation of the system can be recycled, without pollution to the environment, and the sea sand processing capacity can reach 300-600 tons per hour, with significant economic benefits.

Description

Technical Field

[0001] The invention relates to the field of building materials, and in particular to a full-process resource-based sea sand dechlorination and impurity removal system. Background Art

[0002] In order to protect the environment of inland river sand and sand mines, all parts of my country have been implementing a comprehensive ban on river sand mining. In addition, mineral sand has also been purified to extend its industrial chain. Under this situation, construction sand resources, especially those in coastal areas, are becoming increasingly scarce.

[0003] On the other hand, there are abundant sea sand mines along the coast of my country. After being soaked in seawater for a long time, a large amount of chloride will be produced on the surface of sea sand, so sea sand contains a large amount of chloride ion components, which will have a serious corrosive effect on cement and steel bars. In addition, sea sand also contains impurities such as silt, shells, mica, and light substances. These impurities also reduce the bonding strength between aggregates and cement and stone in concrete. Therefore, untreated sea sand greatly exceeds the standard for construction sand. After mixing concrete, it will have a serious corrosive effect on the steel bars inside the concrete when used in engineering construction, and will destroy the bonding structure of reinforced concrete, which will have a great impact on the durability of the project quality. Therefore, in order to meet the requirements of reinforced concrete sand, sea sand must be cleaned, dechlorinated and de-impurified.

[0004] Repeated flushing with fresh water is a common method for desalinating sea sand. The equipment used in this method has a simple structure and is economical and applicable. However, fresh water flushing alone cannot tear the protective film on the surface of the sea sand, and the effect of desalination of sea sand is not ideal. In the actual application of the sea sand desalination system, the sedimentation tanks are directly connected, that is, the sea sand cleaned in the previous level has not been dehydrated, but directly enters the next level sedimentation tank. A large amount of chloride ions are dissolved in the water and mixed with the sea sand and enter the next level sedimentation tank. The sea sand cleaning effect is poor and the efficiency is low. In addition, sea sand contains not only chloride salts, but also sulfates, etc., and ozone treatment cannot remove sulfates. Moreover, there is a lack of treatment measures for wastewater and solid waste after cleaning sea sand in public information and actual applications. Direct discharge will pollute the environment and cause waste of fresh water resources.

[0005] In summary, the current sea sand treatment system has the following problems:

[0006] 1. The core indicator of the purified sea sand - the chloride ion content is far lower than the national and international standards. The electrical flux test of the concrete samples shows that there is a slow release of excessive chloride ions.

[0007] 2. The high concentration of chloride salt water discharged from cleaning sea sand is directly discharged into the sea or directly transported to salt fields for crystallization and salt drying, or transported to saltwater aquaculture farms for supplementary water. For sea sand processing plants far away from the coast and salt fields or saltwater aquaculture farms, this method has low feasibility and high transportation costs, which increases the cost of processing sea sand.

[0008] 3. During the sea sand treatment process, a large amount of silt will be discharged, and a small amount of fine sand will be lost. The treatment is to use sedimentation tanks for multi-stage natural sedimentation until it is completely clarified and then overflowed and discharged, and then the silt is cleaned and landfilled. If this silt is not treated, it is easy to cause serious secondary pollution and ecological damage, polluting the soil, water sources and even the food chain. Summary of the invention

[0009] In view of the above problems, the present invention provides a full-process resource-based sea sand dechlorination and impurity removal system, which can remove impurities in sea sand and chloride ions on the surface and inside of sea sand, so that the treated sea sand meets the standards for construction use and the waste liquid and solid waste generated during the processing are all recycled.

[0010] To this end, the technical solution of the present invention is as follows:

[0011] A full-process resource-based sea sand dechlorination and impurity removal system, including a screening unit, a cleaning and rinsing unit, an impurity separation unit, an ultrasonic generator, an alkaline potential water generator, a low-pressure ozone generation array stack, a linear vibration transmission water screening unit, a flocculation tank, a filter press, a water collection tank, a reverse osmosis treatment tank, a sun-evaporator and a brine collection unit, wherein:

[0012] The screening unit is used to remove impurities and muddy sand from the sea sand, and send the removed sea sand to the cleaning and showering unit;

[0013] The ultrasonic generator is used to provide a power pulse source for the ultrasonic transducer;

[0014] The ultrasonic transducer is used to provide high-frequency ultrasonic waves to the cleaning and showering unit;

[0015] The alkaline potential water generator is used to provide the cleaning and showering unit with a water containing Na + and OH - Potential water;

[0016] The low-pressure ozone generating array stack is used to provide ozone to the cleaning and showering unit;

[0017] The cleaning and showering unit comprises a first cleaning tank, a first showering tank, a first bucket elevator, a second cleaning tank, a second showering tank and a second bucket elevator, wherein: the first cleaning tank is used to wash away the marine biological humus film on the surface of the sea sand under the action of the variable frequency ultrasonic wave; the first showering tank is used to rinse the sea sand treated in the first cleaning tank with fresh water; the first bucket elevator is used to send the sea sand rinsed in the first showering tank to the second cleaning tank; the second cleaning tank is used to clean the sea sand under the action of the potential water and ozone to wash away the internal chloride ions on the surface of the sea sand; the second showering tank is used to rinse the sea sand treated in the second cleaning tank with fresh water; the second bucket elevator is used to send the sea sand washed away with chloride ions into the linear vibration transmission water screening unit to separate sand and water;

[0018] The flocculation tank is used to collect muddy water from the screening unit and perform flocculation;

[0019] The filter press is used to filter the sediment at the bottom of the flocculation tank;

[0020] The water collection tank is used to collect the flushing water from the cleaning and flushing unit and the screen water from the linear vibration transmission screen water unit;

[0021] The reverse osmosis treatment tank is used to perform reverse osmosis treatment on the flushing water collected by the water collection tank, and the separated fresh water is sent to the cleaning and flushing unit through a pipeline to replenish the fresh water;

[0022] The solar evaporator is used to solar-evaporate and concentrate the salt water separated from the reverse osmosis treatment tank;

[0023] The concentrated brine collecting unit is used to collect the brine evaporated and concentrated by the solar evaporator.

[0024] Preferably, the system also includes a second cleaning and showering unit, which includes a third cleaning tank, a third showering tank, a third bucket elevator, a fourth cleaning tank, a fourth showering tank and a fourth bucket elevator, wherein: the third cleaning tank is used to wash away the marine biological humus film on the surface of the sea sand sent by the second bucket elevator under the action of the variable frequency ultrasonic wave; the third showering tank is used to rinse the sea sand treated in the third cleaning tank with fresh water; the third bucket elevator is used to send the sea sand rinsed in the third showering tank to the fourth cleaning tank; the fourth cleaning tank is used to clean the sea sand under the action of the potential water and ozone, and wash away the chloride ions, sulfides and marine biological humus on the surface and inside of the sea sand; the fourth showering tank is used to rinse the sea sand treated in the fourth cleaning tank with fresh water; the fourth bucket elevator is used to send the rinsed sea sand into the linear vibration transmission water screening unit for sand and water separation.

[0025] The screening unit includes a first vibrating screen, a second belt conveyor, a third vibrating screen and a third belt conveyor, wherein the first vibrating screen is used to screen out shells and pebbles in sea sand; the second belt conveyor is used to send the sea sand screened by the first vibrating screen into the second vibrating screen; the second vibrating screen is used to remove mud and coarse sand in the sea sand under the flushing of fresh water; the third belt conveyor is used to send the sea sand screened by the second vibrating screen into the first cleaning pool.

[0026] The alkaline potential water generator is used to generate Na by electrolyzing a sodium chloride aqueous solution. + OH - Potential water as well as chlorine and hydrogen are contained in the collecting chamber, and the chlorine and hydrogen are sprayed in the collecting chamber to generate hydrochloric acid.

[0027] Preferably, the system further comprises:

[0028] A mixing water collection unit, used to collect water in the upper layer of the flocculation tank and water filtered out by the filter press;

[0029] The caulking brick production unit is used to react the hydrochloric acid with excess magnesium oxide to generate magnesium chloride, use the magnesium chloride and excess magnesium oxide as cementitious materials, and use sand mud and shells separated from sea sand and the water collected by the mixing water collection unit as raw materials to produce caulking bricks.

[0030] Preferably, two solar evaporators are provided, and the brine separated from the reverse osmosis treatment tank is sent to the concentrated brine collection unit after two-stage solar evaporation.

[0031] The present invention has the following beneficial effects:

[0032] 1. The system has good effects on removing chlorine and impurities from sea sand. The chloride content of the treated sea sand is 0.001-0.002%, which is far lower than the national standard, and there is no permanent slow release of chloride ions. It reaches and exceeds the standard of freshwater sand and can fully meet the requirements of construction sand.

[0033] 2. The use of high-potential alkaline water and ozone to jointly treat sea sand greatly improves the chlorine removal efficiency. Therefore, the system can process 300-600 tons of sea sand per hour, with high production efficiency and significant economic benefits.

[0034] 3. The system does not require the addition of any chemicals during operation, and the fresh water, alkaline potential water, etc. required in the production process can be recycled and self-sufficient in the production process, which greatly saves water resources and reduces production costs.

[0035] 4. The waste liquid and solid waste generated during the operation of the system can be recycled and utilized without causing any pollution to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the composition of an embodiment of the full-process resource-based sea sand dechlorination and impurity removal system of the present invention.

[0037] in:

[0038] 1. Silo 2. First belt conveyor 3. First vibrating screen 4. Second belt conveyor 5. Second vibrating screen 6. Third belt conveyor 7. First cleaning tank 8. First shower tank 9. First bucket elevator 10. Second cleaning tank 11. Second shower tank 12. Second bucket elevator 13. Third cleaning tank 14. Third shower tank 15. Third bucket elevator 16. Fourth cleaning tank 17. Fourth shower tank 18. Fourth bucket elevator 19. Linear vibration transmission water screening unit 20. Ultrasonic generator 21. Alkaline potential water generator 22. Water collection tank 23. Reverse osmosis treatment tank

[0039] 24. First sun-drying evaporator 25: Second sun-drying evaporator 26, concentrated brine collection unit 27, flocculation tank 28, filter press 29, low-pressure ozone generation array stack 30, ultrasonic transducer 31, mixing water collection tank 32, caulking brick production unit DETAILED DESCRIPTION

[0040] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] Embodiment 1

[0042] like Figure 1 An embodiment of the whole-process resource-recycling sea sand dechlorination and impurity removal system of the present invention shown includes: a screening unit, a cleaning and rinsing unit, an impurity separation unit, an ultrasonic generator, an alkaline potential water generator, a low-pressure ozone generation array stack, a linear vibration transmission water screening unit 19, a flocculation tank 27, a filter press 28, a water collection tank 22, a reverse osmosis treatment tank 23, a first sun-evaporator 24, a second sun-evaporator 25 and a concentrated brine collection unit 26. The details are as follows:

[0043] The screening unit is used to remove impurities and muddy sand from the sea sand, and send the removed sea sand to the cleaning and showering unit. The screening unit includes a first vibrating screen 3, a second belt conveyor 4, a second vibrating screen 5 and a third belt conveyor 6. The first vibrating screen 3 is used to screen out shells and pebbles from the sea sand raw material; the second belt conveyor 4 is used to send the sea sand screened by the first vibrating screen 3 to the second vibrating screen 5; the second vibrating screen 5 is used to remove mud and coarse sand from the sea sand under the flushing of fresh water; the third belt conveyor 6 is used to send the sea sand screened by the second vibrating screen 5 to the first cleaning pool 7.

[0044] The ultrasonic generator 20 is used to provide a power pulse power supply for the ultrasonic transducer 30; the ultrasonic transducer 30 is used to provide high-frequency ultrasonic waves for the cleaning and showering unit. The alkaline potential water generator 21 is used to provide Na + and OH - The low-pressure ozone generating array stack 29 is used to provide ozone to the cleaning and showering unit.

[0045] There are two cleaning and showering units, and their composition, structure and function are the same.

[0046] The first cleaning and showering unit includes a first cleaning tank 7, a first showering tank 8, a first bucket elevator 9, a second cleaning tank 10, a second showering tank 11 and a second bucket elevator 12. The first cleaning tank 7 is used to wash away the marine biological humus film on the surface of the sea sand under the action of variable frequency ultrasonic waves; the first showering tank 8 is used to rinse the sea sand treated in the first cleaning tank 7 with fresh water; the first bucket elevator 9 is used to send the sea sand rinsed in the first showering tank 8 to the second cleaning tank 10; the second cleaning tank 10 is used to clean the sea sand under the action of the potential water and ozone, and wash away the chloride ions, sulfides and marine biological humus on the surface and inside of the sea sand; the second showering tank 11 is used to rinse the sea sand treated in the second cleaning tank 10 with fresh water; the second bucket elevator 12 is used to send the rinsed sea sand to the second cleaning and showering unit.

[0047] The second cleaning and showering unit includes a third cleaning pool 13, a third showering pool 14, a third bucket elevator 15, a fourth cleaning pool 16, a fourth showering pool 17 and a fourth bucket elevator 18. After being cleaned and showered by the two cleaning and showering units, the sea sand is sent to the linear vibration conveying and water screening unit 19 through the fourth bucket elevator 18 for sand and water separation. The clean sea sand after separation is sent to the desalinated sand yard for storage.

[0048] The flocculation tank 27 is used to collect muddy water from the screening unit and flocculate it; the filter press 28 is used to filter the sediment at the bottom of the flocculation tank 27. The water separated from the flocculation tank 27 and the filter press 28 enters the mixing water collection tank 31.

[0049] The water collection pool 22 is used to collect the flushing water from the cleaning and flushing unit and the screen water from the linear vibration conveying screen water unit 19 .

[0050] The reverse osmosis treatment tank 23 adopts Dow reverse osmosis technology and is used to perform reverse osmosis treatment on the shower water collected by the water collection tank 22. The separated fresh water is sent to the cleaning and showering unit through a pipeline to replenish the fresh water. The first solar evaporator 24 and the second solar evaporator 25 are used to perform two-stage solar evaporation and concentration on the salt water separated by the reverse osmosis treatment tank 23. The concentrated salt water collection unit 26 is used to collect the salt water after solar evaporation and concentration by the solar evaporator.

[0051] The alkaline potential water generator 21 is used to generate Na by electrolyzing a sodium chloride aqueous solution. + OH - Potential water as well as chlorine and hydrogen are contained in the collecting chamber, and the chlorine and hydrogen are sprayed in the collecting chamber to generate hydrochloric acid.

[0052] In addition, the system also includes a caulking brick production unit 32, which is used to react the hydrochloric acid with excess magnesium oxide to generate magnesium chloride, use the magnesium chloride and excess magnesium oxide as cementitious materials, and use the sand mud, shells separated from sea sand and the mixing water as raw materials to produce caulking bricks.

[0053] The process of removing chlorine and impurities from sea sand by the above system is as follows:

[0054] First, the raw material sea sand is sent from the silo 1 to the first vibrating screen 3 via the belt conveyor 2 to separate the coarse shells and pebbles. The sea sand is then sent to the second vibrating screen 5 via the second belt conveyor 4 to screen out the shells and sand mud, and then sent to the cleaning and showering unit via the third belt conveyor 6;

[0055] In the cleaning and showering unit, the sea sand first enters the first cleaning tank for ultrasonic cleaning to tear the organic protective film on the surface of the sea sand; then it enters the second cleaning tank 10 after being showered with fresh water in the first showering tank 8. In the second cleaning tank 10, the sea sand is subjected to the dual effects of electric potential water and ozone to remove the internal chloride ions on its surface. The electric potential water comes from the alkaline electric potential water generator 21, and the reaction of electrolyzing salt water occurs in the alkaline electric potential water generator 21:

[0056] 2NaCl+2H2O=Cl2↑+H2↑+2NaOH

[0057] Among them, Na + OH - Enter the cleaning solution and work together with O3 to remove chloride ions:

[0058] Na + +Cl - =NaCl

[0059] Chlorine and hydrogen are absorbed by the spray water to generate hydrochloric acid.

[0060] The sea sand after dechlorination enters the second flushing pool 11 and is flushed with fresh water.

[0061] In order to improve the effect of removing impurities and chlorine, two cleaning and flushing units are set up, that is, the sea sand is processed by the two cleaning and flushing units in turn to become clean sea sand, and after the sand and water are separated by the linear vibration transmission water screening unit 19, the clean sea sand is output to the sand storage yard.

[0062] In the above treatment process, impurities and sand and mud are removed by the action of two-stage vibrating screens; the protective film on the surface of sea sand is torn by ultrasound; the sodium ions in alkaline potential water react with chloride ions, and under the dual action of ozone, the system achieves extremely high effects of removing chlorine and impurities (mica, sulfate).

[0063] The sea sand processing capacity of the above system is 300-600 tons per hour.

[0064] In a specific embodiment of the above system, the test results of the desalinated sea sand obtained after treatment are as follows:

[0065]

[0066] In another specific embodiment of the above system, the chloride content of the desalinated sea sand obtained after treatment is 0.002%.

[0067] It should be noted that the chloride content and other impurity contents of the sea sand treated by the present invention can also meet the requirements of national and international standards.

[0068] It can be seen from the above test results that the chloride content of the desalinated sea sand obtained after treatment by this system is far lower than the industry standard and international standard. For example: the industry standard JG / J206-2010 "Technical Specifications for Application of Sea Sand Concrete" stipulates that the water-soluble chloride ion content is ≤0.03%; Japan's JASS-5S "Reinforced Concrete Engineering" stipulates that the sodium chloride content should be ≤0.01%; the London Committee's "Specifications for Marine Aggregates" stipulates that the sodium chloride content should be ≤0.03%.

[0069] In addition, after being treated by the above system, except for the chloride content which is far lower than the national and international standards, the contents of other harmful substances (such as mica, light substances, organic matter, sulfides and sulfates, shells, etc.) in the sea sand are in line with national and international standards.

[0070] The resource utilization process of the above system is as follows:

[0071] 1. The fresh water reuse process of the whole system is as follows:

[0072] Fresh water is injected from the upper part of the first flushing pool 8, the second flushing pool 11, the third flushing pool 14, and the fourth flushing pool 17. After stirring and flushing, the wastewater is discharged from the four flushing pools and the linear vibration transmission and screening unit 19 through pipelines to the water collection pool 22, and then sent to the reverse osmosis unit 23 through pipelines for treatment and reuse. Among them, the reused fresh water accounts for 95% of the total wastewater, and the remaining 5% is concentrated wastewater, which is sent to the first sun-evaporator 24 and the second sun-evaporator 25 for further treatment.

[0073] 2. The resource utilization process of wastewater is as follows:

[0074] The reverse osmosis unit 23 has two output pipes: a fresh water recycling pipe and a concentrated liquid pipe. As mentioned above, the recycled fresh water is recycled through the fresh water recycling pipe, and the concentrated brine is transported to the first solar evaporator 24 and the second solar evaporator 25 in sequence through the concentrated liquid pipe, and then enters the concentrated brine collection unit 26 and is transported to the alkaline potential water generator 21 as a raw material for generating alkaline potential water.

[0075] 3. The resource utilization process of muddy water used to clean sea sand is as follows:

[0076] Fresh water is injected from the second vibrating screen 5 , and the wastewater after cleaning and desilting the sea sand is discharged into the flocculation tank 27 , and then enters the mixing water collection tank 31 after being processed by the filter press unit 28 .

[0077] 4. The resource utilization process of the screened and cleaned shells, mud and fine sand:

[0078] The mixing water collected by the mixing water collection pool 30, the fine sand collected by the fine sand collection unit 32, and the screened mud and shells (processed into powder) can be condensed with magnesium oxychloride (the hydrochloric acid produced in the process of generating alkaline potential water reacts with excess magnesium oxide to generate magnesium chloride, and the magnesium chloride and excess magnesium oxide act as gelling agents) and used to make caulking bricks.

[0079] Embodiment 2

[0080] A full-process resource-recycling sea sand dechlorination and impurity removal system, which is different from the first embodiment in that only one cleaning and flushing unit, namely the first cleaning and flushing unit, is provided. After the sea sand is cleaned and flushed by the cleaning and flushing unit, it is sent to the linear vibration transmission water screening unit 19 through the second bucket elevator 12 for sand and water separation. The clean sea sand after separation is sent to the desalination sand yard for storage. The sea sand treated by this system meets all national and international standards in various indicators.

[0081] The chloride content and other impurity content of the sea sand treated by the above system can also meet the requirements of national and international standards.

Claims

1. A full-process resource-based sea sand dechlorination and impurity removal system, characterized by: It comprises a screening unit, a cleaning and rinsing unit, an impurity separation unit, an ultrasonic generator (20), an alkaline potential water generator (21), a low-pressure ozone generating array stack (29), a linear vibration transmission water screening unit (19), a flocculation tank (27), a filter press (28), a water collection tank (22), a reverse osmosis treatment tank (23), a sun-evaporator and a concentrated brine collection unit (26), wherein: The screening unit is used to remove impurities and muddy sand from the sea sand, and send the removed sea sand to the cleaning and showering unit; The ultrasonic generator (20) is used to provide a power pulse source for the ultrasonic transducer (30); The ultrasonic transducer (30) is used to provide high-frequency ultrasonic waves for the cleaning and showering unit; The alkaline potential water generator (21) is used to provide the cleaning and showering unit with a liquid containing Na + and OH - Potential water; The low-pressure ozone generating array stack (29) is used to provide ozone to the cleaning and showering unit; The cleaning and showering unit comprises a first cleaning tank (7), a first showering tank (8), a first bucket elevator (9), a second cleaning tank (10), a second showering tank (11) and a second bucket elevator (12), wherein: The first cleaning tank (7) is used to wash away the marine biological humus film on the surface of the sea sand under the action of variable frequency ultrasonic waves; The first flushing pool (8) is used to flush the sea sand treated in the first cleaning pool (7) with fresh water; The first bucket elevator (9) is used to transport the sea sand washed in the first flushing tank (8) into the second cleaning tank (10); The second cleaning pool (10) is used to clean the sea sand under the action of the electric potential water and ozone, so as to wash away the internal chloride ions on the surface of the sea sand; The second flushing pool (11) is used to flush the sea sand treated in the second cleaning pool (10) with fresh water; The second bucket elevator (12) is used to send the sea sand washed free of chloride ions into the linear vibration conveying water screening unit (19) to separate the sand from the water; The flocculation tank (27) is used to collect muddy water from the screening unit and perform flocculation; The filter press (28) is used to filter the sediment at the bottom of the flocculation tank (27); The water collection pool (22) is used to collect the flushing water from the cleaning and flushing unit and the screen water from the linear vibration transmission screen water unit (19); The reverse osmosis treatment pool (23) is used to perform reverse osmosis treatment on the flushing water collected by the water collection pool (22), and the separated fresh water is sent to the cleaning and flushing unit through a pipeline to replenish the fresh water; The solar evaporator is used to solar-evaporate and concentrate the salt water separated by the reverse osmosis treatment tank (23); The concentrated brine collection unit (26) is used to collect the brine evaporated and concentrated by the solar evaporator.

2. The system for removing chlorine and impurities from sea sand during the whole process of resource utilization according to claim 1 is characterized in that: It also includes a second cleaning and showering unit, which includes a third cleaning tank (13), a third showering tank (14), a third bucket elevator (15), a fourth cleaning tank (16), a fourth showering tank (17) and a fourth bucket elevator (18), wherein: The third cleaning tank (13) is used to wash away the marine biological humus film on the surface of the sea sand delivered by the second bucket elevator (12) under the action of the variable frequency ultrasonic wave; The third flushing pool (14) is used to flush the sea sand treated in the third cleaning pool (13) with fresh water; The third bucket elevator (15) is used to transport the sea sand washed in the third flushing tank (14) into the fourth cleaning tank (16); The fourth cleaning tank (16) is used to clean the sea sand under the action of the electric potential water and ozone, and wash away the chloride ions, sulfides and marine biological humus on the surface and inside of the sea sand; The fourth flushing pool (17) is used to flush the sea sand treated in the fourth cleaning pool (16) with fresh water; The fourth bucket elevator (18) is used to deliver the washed sea sand into the linear vibration conveying water screening unit (19) to separate the sand from the water.

3. The system for removing chlorine and impurities from sea sand during the whole process of resource utilization according to claim 1 or 2, characterized in that: The screening unit comprises a first vibrating screen (3), a second belt conveyor (4), a third vibrating screen (5) and a third belt conveyor (6), The first vibrating screen (3) is used to screen out shells and pebbles from sea sand; The second belt conveyor (4) is used to convey the sea sand screened by the first vibrating screen (3) to the second vibrating screen (5); The second vibrating screen (5) is used to remove mud and coarse sand from the sea sand under the flushing of fresh water; The third belt conveyor (6) is used to convey the sea sand screened by the second vibrating screen (5) into the first cleaning pool (7).

4. The system for removing chlorine and impurities from sea sand during the whole process of resource utilization according to claim 3 is characterized in that: The alkaline potential water generator (21) is used to generate Na by electrolyzing a sodium chloride aqueous solution. + OH - Potential water as well as chlorine and hydrogen are contained in the collecting chamber, and the chlorine and hydrogen are sprayed in the collecting chamber to generate hydrochloric acid.

5. The system for removing chlorine and impurities from sea sand during the whole process of resource utilization according to claim 4 is characterized in that Also includes: A mixing water collection unit, used to collect water in the upper layer of the flocculation tank (27) and water filtered out by the filter press (28); The caulking brick production unit (32) is used to react the hydrochloric acid with excess magnesium oxide to generate magnesium chloride, use the magnesium chloride and excess magnesium oxide as cementitious materials, and use sand mud and shells separated from sea sand and the water collected by the mixing water collection unit as raw materials to produce caulking bricks.

6. The system for removing chlorine and impurities from sea sand during the whole process of resource utilization according to claim 5 is characterized in that: The solar evaporator comprises a first solar evaporator (24) and a second solar evaporator (25). The brine separated by the reverse osmosis treatment tank (23) is sent to the concentrated brine collection unit (26) after two-stage solar evaporation.

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