CN107162454B

CN107162454B - Desalination treatment process based on sea sand

Info

Publication number: CN107162454B
Application number: CN201710343451.9A
Authority: CN
Inventors: 钟天伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-05-16
Filing date: 2017-05-16
Publication date: 2020-06-19
Anticipated expiration: 2037-05-16
Also published as: CN107162454A

Abstract

The invention discloses a treatment process based on sea sand desalination, which comprises the following steps: (1) collecting sea sand in an offshore collection area by an offshore sea sand collection ship; (2) after collecting the sea sand, transporting the sea sand to a sea desalination ship; (3) the transport ship transports fresh water to a desalting device of the offshore desalting ship to desalt sea sand; (4) the sea sand desalting treatment process is advanced, the process steps are reduced, the shore-based transfer amount is reduced, the shore-based treatment discharge is reduced on the premise of ensuring the quality, the process flow of sea sand desalting treatment is shortened, the overall efficiency of sea sand desalting treatment is improved, the cost of the process scheme is reduced, the required fresh water can be provided by the transport ship after taking water from a fresh water area, the land pollution discharge is reduced, the land occupation area is reduced, and the influence on sea sand desalting treatment caused by field limitation is avoided.

Description

Desalination treatment process based on sea sand

Technical Field

The invention relates to the technical field of sea sand desalination, in particular to a sea sand desalination treatment process.

Background

At present, cement concrete is produced by 25 hundred million m3 in China every year, and more than 30 hundred million tons of building sand are needed every year in addition to mortar and other purposes. The contradiction that the river sand resource as concrete fine aggregate is short of supply is increasingly prominent. The situation that river (river) sand resources are deficient already occurs in many places; meanwhile, measures are gradually taken in various places to limit the natural landscape and the ecological environment so as to prevent the serious damage of the excessive exploitation of river sand.

In order to solve the conflict of river sand supply and demand, people project eyes to the ocean occupying 70.8 percent of the area of the earth, and the reasonable development and utilization of sea sand resources become an inevitable choice.

The construction house usually has no need of reinforced concrete, however, the sea sand contains a large amount of chloride which can cause the corrosion of the steel bar, so that the passive film on the surface of the steel bar is damaged, and then a corrosion battery is formed on the surface of the steel bar to generate electrochemical corrosion, a corrosion product generated by the continuous corrosion of the steel bar can generate tensile stress around the steel bar due to the increase of the volume by 4-7 times, and when the corrosion product is accumulated to a certain extent, the peeling of a concrete protective layer or the cracking of the steel bar can be caused; sulfate in the sea sand can generate calcium sulphoaluminate hydrate in the pores of the concrete, so that the concrete is cracked and peeled; the sea sand contains substances such as shells and the like, so that the workability of concrete can be obviously reduced, the mechanical properties such as tensile strength, folding resistance and compressive strength of the concrete are influenced, the durability such as frost resistance, abrasion resistance and impermeability of the concrete is reduced, and the volume stability of the concrete is even influenced; the sea sand contains minerals such as opal and flint and alkali metals such as sodium and potassium, and causes alkali-aggregate reaction of concrete, thereby reducing the durability and safety of the concrete structure; sea sand also contains harmful substances such as sulfur and phosphorus, and when the content of the substances is high, the strength of concrete is reduced.

In order to improve the earthquake-resistant and compressive strength of buildings, the desalination of sea sand is an essential step for using the sea sand in building engineering. The conventional sea sand desalination treatment process belongs to shore-based treatment, all treatment process flows including mud removal, shell stone removal, desalination and the like are realized on the shore base, and almost no treatment link exists in the process of collecting and transporting sea sand to the shore, so that problems are caused: the cost is high, a large site is needed to be arranged, and infrastructure construction is needed to meet the requirement of treating sea sand or half-light salty sand; secondly, sea sand or half-light salty sand is mined from the water, and is usually required to be circulated when being transported to a site, and the operation cost is inevitably increased each time of circulation. The site has specific requirements, and the site meeting the requirements is not necessarily close to the site of the project and a mining area, so that the transportation cost is increased; and thirdly, disposing of impurities generated by the shore-based process.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and in order to achieve the purpose, the technical scheme of the invention is as follows:

in the invention, the treatment process based on sea sand desalination comprises the following steps:

(1) collecting sea sand in an offshore collection area by an offshore sea sand collection ship;

(2) after collecting the sea sand, transporting the sea sand to a sea desalination ship;

(3) the transport ship transports fresh water to a desalting device of the offshore desalting ship to desalt sea sand;

(4) and after the desalting treatment, transporting the sea sand to a land sea sand finished product stacking area through a transport ship.

In order to further realize the invention, the desalting device comprises a silt separation device, a vibration screening device and a cleaning device.

In order to further realize the method, the sea sand sequentially passes through a mud-sand separating device, a vibration screening device and a cleaning device.

In order to further realize the method, the sea sand sequentially passes through a mud-sand separating device, a cleaning device and a vibration screening device.

In order to further realize the invention, the cleaning device adopts a double-helix washing and dehydrating machine.

In order to further realize the invention, the transport ship comprises a sand cabin arranged on the main ship body, and an air cabin which can be injected with air is arranged below the sand cabin.

In order to further realize the invention, a water tank which can be filled with water is arranged below the sand tank, and the water tank is arranged above or below the air tank.

In order to further realize the invention, the water tank is divided into a left interval and a right interval, the air tank is divided into a left interval and a right interval, and the ship body is inclined to the shore side to realize sand unloading by injecting water into one interval of the water tank and discharging air into one interval of the air tank.

In order to further realize the invention, the cleaning device adopts a fluidized backwashing machine and comprises a rotating part, a rotating shaft, a motor, a plurality of connecting supports and a backwashing device, wherein an output shaft of the motor is fixedly connected with the rotating shaft which is fixedly connected with a rotor, and the rotating part is driven by the motor to rotate at a high speed; one end of each connecting support is arranged on the rotating part at intervals, and the other end of each connecting support is fixedly connected with the backwashing device.

In order to further realize the invention, the vibrating screening device is integrated with the cleaning device.

Advantageous effects

1. The finished sand is stacked to the bank or directly sold to the bank by a shore-based production line, and the treatment process is added in the collection and transportation links of the sea sand.

2. The fresh water is conveyed to the desalting boat by the transport boat, the desalted sea sand is conveyed to the land by the transport boat, the traditional transport boat returns to the sea to convey the sea sand to the land, the sea boat is an empty boat, the utilization rate of the transport boat is low, the sea sand or the fresh water is filled in the process of returning by the transport boat, the utilization rate of the transport boat is improved, meanwhile, the transport boat is provided with the air cabin, the buoyancy borne by the boat body can be improved by injecting air into the air cabin, and under the same waterline, the sea sand or the fresh water can be loaded on the boat body without the air cabin, so that the loading capacity of the boat body is improved, and the boat body can have higher use efficiency under the condition of consuming the same fuel.

3. This transport ship sand cabin's lower extreme is equipped with the water tank, the air tank, through to water tank injected water, make the draft degree of hull increase, thereby make the hull more stable, let water tank and air tank divide into about two intervals, when the transport ship transports sea sand to land, need unload the sea sand, at this moment, the accessible will right or left retaining in-deck injected water, again with left or right air tank evacuation air, make whole main hull slope to the bank, and the sea sand in the sand cabin can be along with the slope of hull and pour out the sand tank, to land, simple structure.

4. Sea sand is sent to the desalting ship from the transport ship, then sequentially passes through the mud-sand separating device, the vibration screening device and the cleaning device, finally enters the transport ship, and is sent to land, wherein the cleaning device can be realized by adopting a double-helix washing and dehydrating machine, a fluidized back washing machine and vibration screening.

Drawings

FIG. 1 is a schematic process flow diagram of the present invention;

FIG. 2 is a schematic view of the structure of the transport vessel of the present invention;

FIG. 3 is a schematic structural diagram of a desalination vessel according to the present invention;

FIG. 4 is a schematic structural diagram of a sand conveying pipe;

FIG. 5 is a schematic diagram of the construction of the silt separation apparatus of the present invention;

FIG. 6 is a top view of a silt screen;

FIG. 7 is a side view of a silt screen;

FIG. 8 is a schematic diagram of the construction of a vibratory screening apparatus;

FIG. 9 is a schematic structural view of a shaker;

FIG. 10 is a side view of the twin screw washer-thresher with the conveyor belt and water-spinning ring apparatus removed;

FIG. 11 is a top view of FIG. 15;

FIG. 12 is a schematic view showing the overall structure of the twin screw washing and dehydrating machine of the present invention;

FIG. 13 is a partial schematic view of the screw shaft with paddles;

FIG. 14 is a schematic structural view of a blade;

FIG. 15 is a schematic diagram of the vibratory screening and washing machine of the second embodiment;

FIG. 16 is a schematic structural view of a vibratory screening device of example three;

FIG. 17 is a schematic illustration of an embodiment three shaker screen configuration;

FIG. 18 is a schematic illustration of an alternative vibratory screening arrangement according to yet another embodiment;

FIG. 19 is a schematic view of the internal structure of the screen of FIG. 18;

FIG. 20 is a schematic illustration of an embodiment tri-fluidized backwash machine configuration;

FIG. 21 is a schematic structural view showing a water inlet state of the backwashing device;

FIG. 22 is a schematic diagram of the backwash assembly in a reverse backwash configuration.

Detailed Description

Corresponding reference characters indicate corresponding parts throughout the several views of the drawings. A

Example 1

As shown in fig. 1, the treatment process for desalting sea sand comprises the following steps:

The carrier in step 2 is realized by adopting the following structure, as shown in fig. 2, the carrier comprises a sand cabin 12 arranged on a main ship body 11 and a bottom cabin positioned below the sand cabin 12, the sand cabin 12 is used for storing sea sand and fresh water, the sand cabin 12 is provided with a sand containing groove 121, the sand containing groove is preferably arranged at the central position, a vibration device is arranged below the sand containing groove 121, the vibration device has the same principle as a vibration disc, the sand containing groove is driven by a motor to vibrate, so that the sea sand at other positions of the sand cabin can be gathered on the sand containing groove 121, and when the carrier is close to land, a excavator can conveniently transport the sea sand to a target position.

The bottom cabin comprises a water storage cabin 13 and an air cabin 14, the water storage cabin 13 is arranged below the sand cabin 12, the air cabin 14 is arranged below the water cabin 13, the water storage cabin 13 and the air cabin 14 are divided into two sections, namely the water cabin 13 consists of a left water storage cabin 131 and a right water storage cabin 132, the air cabin 14 consists of a left air cabin 141 and a right air cabin 142, the preferable scheme is average arrangement, the left water cabin 131 and the right water cabin 132 are both provided with a water inlet 133 and a water inlet 134, the water inlet 133 is communicated with a water inlet pipe 135, the water inlet pipe 135 is provided with a first electromagnetic valve, the water inlet 134 is communicated with a water outlet pipe, the water outlet pipe 136 is provided with a second electromagnetic valve, water injection and water drainage are carried out on the water storage cabin 13 by controlling the first electromagnetic valve and the second electromagnetic valve, the left air cabin 141 and the right air cabin 142 of the air cabin 14 are both provided with a gas injection port 144 and an exhaust port 145, the gas, the exhaust port 145 communicates with an exhaust pipe, which is provided with a fourth valve, and a buoyancy generating device is formed by injecting gas into the air tank, thereby increasing buoyancy compared to the case where the air tank 14 is not present, at the same draft.

As shown in fig. 3 to 4, the desalination ship comprises a ship body 21, wherein the ship body 21 is positioned at sea by a plurality of positioning anchors 5, the ship body 21 comprises a bearing cabin 211 for bearing sea sand and a sea sand desalination device and a bottom cabin positioned below the bearing cabin 211, the bottom cabin comprises a water storage cabin 212 and an air cabin 213, the water storage cabin 212 is arranged below the bearing cabin 11, the air cabin 213 is arranged below the water storage cabin 212, the water storage cabin 212 and the air cabin 213 are divided into two sections, namely, the water storage cabin 212 comprises a left water storage cabin 2121 and a right water storage cabin 2122, the air cabin 213 comprises a left air cabin 2131 and a right air cabin 2132, preferably, the left water storage cabin 2121 and the right water storage cabin 2122 are both provided with a water injection port 2123 and a water discharge port 2124, the water inlet 123 is communicated with a water inlet pipe, the water inlet pipe is provided with a first electromagnetic valve, the water discharge port 2124 is communicated with a water outlet pipe, the water outlet pipe, the water is injected into and drained from the water storage tank 212 by controlling the first electromagnetic valve and the second electromagnetic valve, the left air tank 2131 and the right air tank 2132 of the air tank 213 are respectively provided with a gas injection port 2133 and a gas exhaust port 2134, the gas injection port 2133 is communicated with a gas inlet pipe, the gas inlet pipe is provided with a third valve, the gas exhaust port 2134 is communicated with a gas exhaust pipe, the gas exhaust pipe is provided with a fourth valve, and gas is injected into the air tanks to form a buoyancy generating device, so that buoyancy is increased, compared with the situation without the air tanks 213, under the same draft, because the desalination ship is provided with the air tanks 213, the buoyancy is larger, the bearing capacity is stronger, the service efficiency of the desalination ship is improved, the desalination efficiency of sea sand is improved, when the sea sand needs to be conveyed to the transport ship, the sea sand needs to be discharged, at the moment, water is injected into the right water storage tank 2122, and then the right air tank is evacuated, the whole ship body 21 inclines rightwards, or water is injected into the left water storage tank 2121, then air is used as an air tank for air evacuation, the whole ship body 21 inclines leftwards, the inclination direction of the ship body 1 faces the cabin position of the transport ship, desalted sea sand is conveyed into the sand containing cabin 214, a vibration device is arranged below the sand containing cabin 214, the vibration device has the same principle as a vibration disc, and is driven by a motor to vibrate a sand containing groove, so that the sea sand in the sand containing cabin 214 can be gathered at one position, and the sea sand on a bearing ship can be poured into the sand containing cabin of the transport ship 1 along with the inclination of the ship body 21;

in order to realize that sea sand is uniformly conveyed to a sand cabin of a transport ship and prevent the transport ship 1 from turning over due to the fact that the sea sand is gathered in one place, the embodiment adopts the following technical scheme;

the sand loading cabin 214 can be arranged in the middle or on two sides of the ship body 1, and according to specific conditions, the sand loading cabin 214 is preferably arranged on the right side, the right end of the sand loading cabin 214 is fixedly connected with a sand conveying pipe 215, the sand far pipe 215 comprises a main pipe 2151 and a plurality of branch pipes 2152, the main pipe 2151 is connected with the sand loading cabin 214, the branch pipes 2152 are uniformly and obliquely downwards arranged at two ends of the main pipe 2152, which exceed the end part of the ship body 21, the branch pipes 2152 comprise first branch pipes 21521 and second branch pipes 21522, a plurality of sand outlet ports 2153 are uniformly arranged on pipe walls along the length directions of the main pipe 2151 and the branch pipes 2152, the second branch pipes 21522 are further obliquely downwards arranged at two ends of the first branch pipes 21521, and the like, third branch pipes and the like are arranged on the second branch pipes, and sand outlet ports 2153 are respectively arranged, and the hole diameters of the sand outlet ports 2153 are sequentially increased, namely.

The process of pouring the sea sand transported to the transport ship by the sea sand of the desalination ship is as follows: firstly, water is injected into the water storage tank 212, so that the draught degree of the ship body 1 is increased, the ship body is more stable, when the desalinated sea sand needs to be conveyed to a transport ship, the water in the water storage tank is pumped away, the draught degree of the ship body is reduced, the desalinated ship is higher than the transport ship, and the sand pouring is facilitated;

a desalting device is arranged on the ship body 21, and the desalting device sequentially comprises a silt separation device 22, a vibration screening device 3, a cleaning device 4 and a plurality of positioning anchors 5 for stabilizing the desalting ship in the sea;

sea sand collected from a collection ship is conveyed to a desalination ship for desalination, the sea sand firstly passes through a mud-sand separation device, and the mud-sand separation device 22 comprises a fixed frame 221, a stirring cylinder 222, a stirring device 223, a sand suction device 224, a sand suction device 225 and a muddy water storage cylinder 226, wherein:

the fixing frame 221 is used for fixing the mixing drum 222 on the desalination ship, and the bottom end of the fixing frame 221 is fixed on the desalination ship. The mixing drum 222 is fixedly connected with the fixed frame, the mixing drum 222 is made of materials with acid and alkali resistance, corrosion resistance and high rigidity strength, a hollow cavity is arranged inside the mixing drum 222, the top end of the mixing drum is provided with an opening, the opening is covered by a cover plate 2221 above the opening, the cover plate 2221 is detachably connected with the mixing drum 222, a sea sand feeding port 2222 and a fresh water inlet 2223 are respectively arranged on the cover plate 2221, the sea sand feeding port 2212 is used for adding sea sand into the mixing drum 222, and the fresh water inlet 2223 is connected with a fresh water pipe and used for adding fresh water into the mixing drum 222. A sand outlet is arranged on the side wall of the mixing drum 222, and a sludge outlet 2224 is arranged at the lower end of the mixing drum 222.

The stirring device 223 includes a stirring paddle 2231, a stirring rod 2232, a motor 2233, and a shock-absorbing base 2234. The stirring paddle 2231 and the shock absorption base 2234 are fixedly arranged at the upper end of the stirring cylinder 222, a through hole is formed in the middle of the shock absorption base 2234, the stirring rod 2232 penetrates through the through hole, most of load is borne by the shock absorption base 2234, abrasion of gears is greatly reduced, a motor 2233 is arranged on the shock absorption base 234, an output shaft of the motor 2233 is fixedly connected with the stirring rod 2232, the bottom end of the stirring rod 2232 vertically extends into the stirring cylinder 222, and the stirring paddle 2231 is arranged on the stirring rod 2232; the motor 2233 drives the stirring rod 2232 to rotate, and the stirring paddles 2231 are arranged at intervals along the length direction of the stirring rod 2232;

the sand suction device 224 is used for sucking out sea sand from the mixing drum, the sand suction device 224 comprises a sand suction pipe 2241, a sand suction pump 2243 and a sand storage device 2244, wherein the sand suction pipe 2241 is connected with the sand outlet 2213, the sand suction pipe 2241 is provided with a connector 22415, the sand suction pump 2243 is connected with the connector 22415 and the sand suction pipe 2241 through a connecting pipe 2244, and the other end of the sand suction pipe 2241 is communicated with the sand storage device 2244;

the muddy water filter screen 225 is fixedly arranged at the mud outlet, and the meshes of the muddy water filter screen 225 are smaller than the particle size of the sea sand. In order to prevent the muddy water filter screen 225 from being blocked by the muddy water filter screen 225 due to the accumulation of the muddy sand in the center of the muddy water filter screen 225, the invention improves the muddy water filter screen 225, the upper surface of the muddy water filter screen 225 is set to be a conical plane with a high middle part and a low periphery, a rotary vane 2251 and a connecting rod 2252 can be further arranged at the edge of the muddy water filter screen 225, the rotary vane 2251 is rotatably connected with the connecting rod 2252, the connecting rod 2252 is fixedly connected to the upper surface at the edge of the muddy water filter screen 225, and the number of the rotary vanes 225. When the motor 233 starts to work, the motor drives the stirring paddle to rotate, water generates a vibration force in the stirring cylinder 22 under the shearing action of the stirring paddle, the rotary vane 2251 is driven to rotate, the rotary vane 2251 further increases the vibration force of the water in the stirring cylinder 22, sea sand is prevented from being gathered at the edge of the muddy water filter screen 225, and the sea sand can be further washed.

The muddy water storage cylinder 226 is made of acid-base-resistant and corrosion-resistant materials, an opening is formed in the upper end of the muddy water storage cylinder, the opening is detachably fixed on the outer peripheral surface of the side wall of the lower end of the mixing cylinder 1 and is positioned right below the sand suction device 225 for receiving muddy water flowing out of the mixing cylinder 1 through the sand suction device 225. The middle of the mud water storage cylinder 226 is provided with a filter screen or a filter cloth 261, so that the mud water storage cylinder 226 is divided into a mud area 2262 and a clear water area 2263, the side surface of the mud area 2262 is provided with a mud outlet 22621, the side wall of the clear water area 2263 is provided with an outlet 22631, mud water enters the mud water storage cylinder 2226, the mud water is filtered by the filter screen or the filter cloth, the mud water is left in the mud area 2262, the clear water is left in the clear water area, and the outlet 22631 is connected with a clear water pipe, so that the filtered water can be reused, and the purpose of saving water is achieved.

After silt separation, vibratory screening is carried out again to sea sand, and vibratory screening device 3 is used for being sieved by the sea sand after silt separation device separates, mainly includes fuselage 31, shale shaker 32, baffle box 33, wherein:

the body 31 is fixed on a target position, and the body 31 is made of acid-base-resistant and corrosion-resistant materials. A sand inlet is arranged at the upper end of the machine body 31 forming a cavity in the machine body 31, and a funnel-shaped feed hopper 311 is connected to the sand inlet;

the vibrating screen 32 is used for separating shells, broken stones, coarse sand and fine sand in the sea sand, the vibrating screen 32 is arranged in the cavity of the machine body 31, in order to realize the classification of the sea sand, the vibrating screen 32 at least comprises two layers of vibrating screens, and the vibrating screen with seven layers of vibrating screens is taken as an example below. The vibrating screen 32 comprises a screen 321, a screen frame 322, a vibrator 323 and a side plate 324, wherein the screen frame 322 is arranged at the lower end of the screen 321, the number of the screen frames 322 can be one or two, two ends of the screen frame 322 are fixedly connected with the inside of the machine body, the vibrator 323 is arranged at the bottom end of the screen frame 322, the vibrator adopts a vibrating motor, the side plate 324 surrounds three surfaces (except one surface at the discharging position) of the screen, and the vibrating screen consists of a first vibrating screen 3201, a second vibrating screen 3203, a third vibrating screen 3203, a fourth vibrating screen 3204, a fifth vibrating screen 3205, a sixth vibrating screen 3206 and a seventh vibrating screen 3207 from top to bottom respectively, wherein the aperture of the screen 321 is sequentially reduced from top to bottom, the aperture is sequentially 5.1mm, 4.75mm, 2.36mm, 1.18mm, 600m, 300m and 150m from top to bottom, the first vibrating screen 3201 is used for removing large-diameter particles, shells, broken stones and the like in sea sand, the second vibrating screen to the seventh vibrating screen are used for screening the sea sand according to the, when the diameter of the sea sand is smaller than the aperture of the screen 321, the sea sand will leak to the next screen 321, the screens 321 with different apertures screen out the sea sand with different diameters, and the structure of each vibrating screen is the same.

Preferably, the vibrating screens are all obliquely arranged and are inclined towards the discharge port.

The guide chute 33 is arranged at the sand outlet position of the screen, and sea sand flows out of the guide chute 33 and enters the cleaning device for dechlorination cleaning.

The cleaning device 4 of the embodiment adopts a double-helix washing and dehydrating machine;

the double-helix washing and dehydrating machine 4 comprises a bracket 41, a tank body 42, two helical shafts 43, blades 44, helical blades 45, a driving device 46, a conveying belt 47 and a water circulating device 48, wherein the tank body 42 is used for washing sand, the left end of the tank body 42 is provided with a water tank 421, ozone water (the mixture of ozone and water) is injected into the water tank 421, sea sand is soaked in the water tank before elution so as to remove free chlorine ions, the two helical shafts 43 are arranged in the tank body 42, the helical shafts 42 are provided with the helical blades 45, the helical blades 45 on the two helical shafts 43 are arranged in a staggered manner, and the blades 44 are arranged on the helical shafts 42 in a one-to-one manner, are arranged at intervals with the helical blades 45 and are arranged at two ends;

the paddle 44 includes a main paddle 441, an auxiliary paddle 442, a first side paddle 443, a second side paddle 444, wherein the main paddle 441 and the auxiliary paddle 442 are fixed on the screw shaft 42 in a staggered manner and are arranged in a 90-degree staggered manner, the main paddle 441 is arranged in three pieces, although not limited to the number, one piece, two pieces, three pieces, etc. are provided as required, the main paddle 441 is uniformly arranged around the screw shaft 43, and the auxiliary paddles 442 are uniformly arranged around the screw shaft 43, wherein two sides of the main paddle 441 and the first side paddle 443 are integrally arranged in 0-90-degree, preferably 60-degree, and a plurality of first material through holes 445 are provided on the main paddle 441 and the first side paddle 443, the first material through holes 445 are in a triangular structure, and the number of the material through holes 445 near the screw shaft 43 is greater than that of the material through holes 445 at the end, which can increase the central displacement of the screw shaft and shear the central displacement of the screw shaft, shear, Dispersing and mixing ability. The size of the auxiliary blade 442 is smaller than that of the main blade 441, the number of the auxiliary blade 442 is the same as that of the main blades, a plurality of second material through holes 446 are formed in the auxiliary blade 442 and the first side blade 444, the second material through holes 446 are of a triangular structure, the number of the material through holes 446 close to the screw shaft 43 is larger than that of the material through holes 446 at the end, and the central discharge capacity and the shearing, dispersing and mixing capabilities of the screw shaft can be improved; the two sides of the auxiliary blade 442 and the second side blade 444 are integrally arranged at an angle of 0-90 degrees, preferably 60 degrees;

the side blades are arranged on each blade, materials are divided into upper and lower parts different from the blades, axial division is increased, and the shearing effect is better. The arrangement of the material through holes in the main blade and the through holes in the side blades can further improve the capability of mixing sea sand and water, the leakage flow of the sea sand is more favorably realized, the shearing performance of the blades is better, the dislocation type main blade and the dislocation type auxiliary blade can interact with materials in different areas, and an included angle a between the blades and the screw shaft is an acute angle, generally speaking, the included angle a is 20-70 degrees. The paddle and the spiral shaft form a certain angle, so that the problem that the material can form regular radial rotational flow when the paddle works is avoided, the phenomenon that the material can be obviously layered from top to bottom under the laminar flow state is also avoided, under the double shearing action of the spiral blade and the paddle, insoluble salt and organic matters can be broken to be attached to the surface of sand to form a hydrated ion biomembrane, the material within 0-30mm can be treated, and soil and ash on the material can be washed into clean material.

The driving device 46 comprises an upper bearing assembly 461, a coupler 462, a speed reducer 463, a lower bearing assembly 464 and a motor 465, wherein the upper bearing assembly 461 is arranged on one side of the upper end of the spiral shaft, the upper bearing assembly 461 is abutted against the coupler 462, the speed reducer 463 is arranged on one side of the upper end of the coupler 462, the motor 465 is arranged on the upper end of the speed reducer, the motor is arranged on one side close to the coupler 462, the lower bearing assembly 464 is arranged on the other side of the spiral shaft, the spiral shaft is driven by the motor to rotate, and;

the upper part of the left end of the tank body 42 is provided with a sand inlet 422, the lower end is provided with a water outlet 423, the upper end of the right end of the tank body 42 is provided with a water inlet 424, the water inlet is connected with a water inlet pipe 426, the water inlet pipe is provided with a control valve 427, the lower end is provided with a sand outlet 425, water flow enters from the right end, sea sand enters from the left end, under the action of spiral stirring, the washing water flow generates convection from top to bottom opposite to the motion direction of the sea sand to achieve the cleaning,

the conveying belt 47 is arranged below the sand outlet, the sea sand is discharged from the sand outlet and then enters the conveying belt 47, and the other end of the conveying belt 47 is conveyed to the conveying belt at the sand inlet, so that the sea sand after the first elution is cleaned for the second time;

the water circulation device 48 comprises a circulating water pipe 481, a water storage tank 482, a centrifugal filter 483, a filter screen 484, a control valve 484 and a water pump 486, wherein the circulating water pipe 481 is connected with the water outlet, the centrifugal filter 483 is arranged on the circulating water pipe 481, the filter screen 484 is arranged at the front end of the water storage tank 482, sewage passes through the circulating water pipe 481, is filtered by the centrifugal filter 483 and the filter screen 484 and then enters the water storage tank 482, the other end of the circulating water pipe 481 is communicated with a fresh water inlet pipe 48, and the fresh water inlet pipe is provided with the control valve 484 and the water pump 486.

The working principle of the double-helix reverse washing and dehydrating machine is as follows: when the sea sand is cleaned for the first time, the sea sand enters the water tank from the sand inlet for soaking for a period of time, then the motion direction of the sea sand is opposite to the washing water flow from top to bottom under the action of spiral stirring to generate convection so as to achieve the cleaning action, then the sea sand enters the conveying belt through the sand outlet, the conveying belt conveys the cleaned sea sand to the sand inlet, then the second elution is carried out, the sewage enters the circulating water pipe, the sewage passes through the centrifugal filter and the filter screen, then enters the water storage tank after being filtered, the sea sand which is cleaned for the first time passes through the fresh water inlet pipe for the second time, the sea sand which is cleaned for the second time directly exits from the sand outlet, the conveying belt stops conveying, when the second batch of sea sand is cleaned, the fresh water inlet pipe valve is firstly closed, the control valve 484 of the circulating water pipe is opened, the water in the water storage tank enters the water inlet under the action of the water pump, the first, sea sand after the washing gets into conveyer belt 47, and conveyer belt 47 sends into sea sand into sand inlet and carries out the second time and wash, and at this moment, close circulating pipe's valve, open the valve of fresh water inlet tube, carry out the second time and wash, this spiral elution machine can realize the cyclic utilization to fresh water on the one hand, and on the other hand realizes the secondary elution to sea sand for sand washing efficiency is higher.

Example 2

The treatment process for desalting the sea sand comprises the following steps:

The structures of the transport ship and the desalination ship in the steps are the same as those of the first embodiment, the desalination process carried out on the desalination ship through the desalination device is carried out through the silt separation device and the vibration screening device, the screened sea sand enters the cleaning device to be cleaned, and then the sea sand is conveyed to the transport ship.

The vibrating screening device of the embodiment adopts the structure of the first embodiment, the structure which is not described is the same as that of the first embodiment, the vibrating screening device is integrally connected with a cleaning device, two chambers in the machine body 31 are distributed left and right to be divided into a screening area and a flushing chamber, the upper end of the machine body 31 is provided with a sand inlet, and a funnel-shaped feeding hopper 311 is connected to the sand inlet;

as shown in fig. 15, the cleaning device 4 is disposed in a washing area of the machine body, a sand inlet is disposed on the corresponding material guiding chute 33, the sand guiding chute is disposed at the sand inlet, sea sand directly enters the washing area along with the material guiding chute, the washing device is divided into seven layers, each layer corresponds to a vibrating screen, the machine body of the washing area is provided with a shell outlet cylinder 401, a water inlet 402, a dechlorinating agent inlet 403, a water outlet 404 and a sand outlet 405, the shell collecting cylinder 401 is fixedly disposed on the top end of the machine body, and the shell collecting cylinder 401 is used for receiving large particles such as shells, micas, and crushed stones; the water inlet 402 is connected with the inlet tube, the inlet tube is equipped with the control valve, the intake pump, the chlorine removal agent access connection has the chlorine removal agent pipe, be equipped with the control valve on the pipe, be equipped with the filter screen on the delivery port 404, the aperture of filter screen is less than sea sand aperture, thereby when drawing water, sea sand can not be taken out along with water, and still be equipped with chlorine ion detector 406, chlorine ion detector 406 is connected with external control ware, the controller and intake pump, go out the water pump, and foretell control valve is connected, the chlorine content in the sea sand in the controller detects the washing machine according to chlorine ion detector 406 in real time, thereby control the volume of intaking and entering chlorine removal agent, and go out sand and play water after the chlorine removal is clean.

Through the vibration screening and washing integrated machine, the problem that equipment and complex processes are separately spent on screening sea sand and washing in the prior art can be solved;

example 3

The treatment process for desalting the sea sand comprises the following steps:

The transport ship in the step is the same as the first embodiment, the process of desalting on the desalting ship is carried out by a silt separation device, a cleaning device and a vibration screening device, and the screened sea sand is conveyed to the transport ship.

The cleaning device adopts a fluidized back washing machine and comprises a rotating part 4001, a motor 4002, a plurality of connecting brackets 4003 and a back washing device 4004, wherein,

the rotating part 4001 adopts a rotor of a traditional centrifuge, is fixedly connected with an output shaft of a motor 4002 through a rotating shaft 40021, is fixedly connected with the rotor, and drives the rotor to rotate at a high speed through the motor;

the connecting brackets 43 are made of a material with higher strength, are arranged on the rotor at intervals, and one end of each connecting bracket is fixedly connected with the rotor;

the back-flushing device 4004 comprises a cylinder 40041, a water inlet valve 40042, a back-flushing valve 40043, a water outlet valve 40044, a water distributor 40045 and a water collector 40046, wherein;

the cylinder 40041 is made of stainless steel, carbon steel or glass fiber and has high weight ratio and high surface corrosion resistance, the connecting bracket 4003 is sleeved on the cylinder 40041, the cylinder 40041 is provided with a water inlet 400411, a sewage discharge outlet 4412, a water outlet 400413, a sand inlet 400414 and a sand outlet 400415,

the water inlet valve 40042 is arranged on a water inlet pipe connected with the water inlet, the backwashing valve is arranged on a drain pipe connected with the drain outlet, and the water outlet valve is arranged on a water outlet pipe of the water outlet;

the water distributor 40045 is connected with a water inlet, so that water flows through the sea sand layer uniformly;

the water collector 40046 is arranged at the bottom of the cylinder 40041, and the water collector 40046 adopts a mushroom-shaped differential pressure compensation filtering water collector, so that the water distribution pressure of the system is balanced in a filtering state, the filtering flow rate is high, the efficiency is high, and the internal circulation backwashing efficiency is high in a backwashing state; the lower end of the water collector 40046 is connected with the water outlet;

the principle of the fluidization centrifugal backwashing machine of the embodiment is as follows: firstly, opening a water inlet valve, enabling fresh water to enter the interior of the barrel, feeding sea sand from a feed inlet, enabling the fresh water to uniformly enter the barrel through a water distributor 40045, enabling water to flow through a water collector, enabling dirt on the sea sand to stay on the sea sand, enabling suspended matters to be fully accumulated in gaps of the sea sand, increasing resistance of the water flow, and needing backwashing when the flow is reduced; during backwashing, the water inlet valve is closed, the backwashing valve is opened, backwashing water enters the cylinder 40041 from the water outlet at the bottom, at the moment, the motor 42 is started, and under the action of centrifugal force and backwashing water, materials with low density are thrown to the inner wall of the cylinder by the centrifugal force due to the small centrifugal force and the difficulty in overcoming the action of the backwashing water.

Silt separator adopts embodiment structure, and vibratory screening device 3 is used for being sieved by the sea sand after centrifugal backwash machine washs, mainly includes fuselage 31, shale shaker 32, baffle box 33, wherein:

as shown in fig. 16, the body 31 is fixed at the target position, and the body 31 is made of acid-base-resistant and corrosion-resistant materials. A sand inlet is arranged at the upper end of the machine body 31 forming a cavity in the machine body 31, and a funnel-shaped feed hopper 311 is connected to the sand inlet;

the vibrating screen 32 is used for separating shells, broken stones, coarse sand and fine sand from sea sand, the vibrating screen 32 is arranged in the cavity of the machine body 31, and the vibrating screen is a two-layer vibrating screen; the first layer of vibrating screen 3201 is used for removing shells, gravels and the like with large particle size in sea sand, the aperture of the first layer of vibrating screen 3201 is 5.1mm, the vibrating screen 32 comprises a screen 321, a screen frame 322, a vibrator 323 and a side plate 324, wherein the screen frame 322 is arranged at the lower end of the screen 321, the number of the screen frames 322 can be one or two, two ends of the screen frame 322 penetrate through the side plate to be fixedly connected with the inside of the machine body, the vibrator 323 is arranged at the bottom end of the screen frame 322, the vibrator adopts a vibrating motor, and the side plate 324 surrounds three sides (except one side at the discharging position) of the.

As shown in fig. 17, the aperture of the second layer vibrating screen 3202 of the present embodiment is adjustable, the screen 321 adopts a grid structure, each node of the screen 321 is provided with an air bag 3211, each air bag 3211 and the screen can be bonded together by glue, one side end of each air bag 341 is provided with an inflation port, the air bags 3211 adopt an elastic rubber wear-resistant material, the structure similar to an automobile tire realizes the change of the size of the air bags by injecting air into the air bags 3211, and after the size of the air bags is changed, the aperture of the screen can also be changed;

as shown in fig. 18-19, the structure can also be adjusted, the screen 321 is made of a material with a relatively high strength and has a certain thickness of 0.5-2cm, a plurality of circular holes 3212 are uniformly formed on the screen 321, circular grooves are inwardly recessed in the inner walls of the circular holes 3212, and air bags 3211 are embedded in the circular grooves; each air bag 3211 and the screen mesh can be bonded together by glue, one side end of each air bag 341 is provided with an inflation inlet, the air bags 3211 are made of elastic rubber wear-resistant material similar to that of an automobile tire, the size of the air bags is changed by injecting air into the air bags 3211, and after the size of the air bags is changed, the aperture of the screen mesh can also be changed; an inflation port is formed in one side end of each air bag 341, the size of each air bag is changed by injecting air into the air bag 3211, and after the size of each air bag is changed, the aperture of the screen can be changed.

When in use, the grain size of the sand grains to be screened is determined firstly, and the screening is carried out from large to small. For example, the grade of sand screened is: 4.75mm, 2.36mm and 1.18mm, the pipes with the same diameter as the sea sand with the target grain diameter are selected to be inserted into the sieve holes, air is injected into each air bag, and when the pipes can be pulled out of the sieve holes by using larger strength, the sieve holes are adjusted to be in a proper range.

When in use, the grain size of the sand grains to be screened is determined firstly, and the screening is carried out from large to small. For example, the grade of sand screened is: 4.75mm, 2.36mm and 1.18mm, selecting sea sand with the aperture slightly larger than the target particle size of the screen, inserting the pipe with the diameter same as that of the sea sand with the target particle size into the sieve holes, injecting air into each air bag, and when the pipe can be pulled out of the sieve holes by using larger strength, indicating that the sieve holes are adjusted to be in a proper range.

As shown in fig. 20 to 22, the guide chute 33 is disposed at the screen sand discharging position, and the sea sand flows out of the guide chute 33.

Example 4

The treatment process for desalting the sea sand comprises the following steps:

The structures of the transport ship and the desalination ship in the steps are the same as those of the first embodiment, the process of desalination by the desalination device on the desalination ship is cleaned by the silt separation device and the cleaning device, and is screened by the vibration screening device, and the screened sea sand is conveyed to the transport ship.

The vibrating screen device of the embodiment adopts the structure of the embodiment 3, and the cleaning device adopts the double-helix washing and dehydrating machine of the first embodiment.

Example 5

The treatment process for desalting the sea sand comprises the following steps:

The structures of the transport ship and the desalination ship in the steps are the same as those of the first embodiment, the desalination process carried out on the desalination ship through the desalination device is carried out through the silt separation device, the vibration screening device and the cleaning device, and the screened sea sand is conveyed to the transport ship.

The vibrating screening device adopts the structure of the embodiment, and the cleaning device adopts the fluidization backwashing device of the embodiment 2.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The sea sand desalination-based treatment process is characterized by comprising the following steps: the method comprises the following steps:

(4) after the desalting treatment is finished, transporting the sea sand to a land sea sand finished product stacking area through a transport ship;

the transport ship comprises a sand cabin arranged on the main ship body, and an air cabin capable of being injected with air is arranged below the sand cabin; a water cabin capable of being filled with water is arranged below the sand cabin, and the water cabin is arranged above or below the air cabin; the water tank is divided into a left interval and a right interval, the air tank is divided into a left interval and a right interval, water is injected into one interval of the water tank, air is discharged into one interval of the air tank, and the ship body inclines to the shore to realize sand unloading.

2. The sea sand desalination-based treatment process according to claim 1, characterized in that: the desalting device comprises a mud-sand separating device, a vibration screening device and a cleaning device.

3. The sea sand desalination-based treatment process according to claim 2, characterized in that: the sea sand sequentially passes through a mud-sand separating device, a vibration screening device and a cleaning device.

4. The sea sand desalination-based treatment process according to claim 2, characterized in that: the sea sand sequentially passes through a mud-sand separating device, a cleaning device and a vibration screening device.

5. The sea sand desalination-based treatment process according to claim 3 or 4, characterized in that: the cleaning device adopts a double-helix washing and dehydrating machine.

6. The sea sand desalination-based treatment process according to claim 3 or 4, characterized in that: the cleaning device adopts a fluidized backwashing machine and comprises a rotating part, a rotating shaft, a motor, a plurality of connecting supports and a backwashing device, wherein an output shaft of the motor is fixedly connected with the rotating shaft, the rotating shaft is fixedly connected with a rotor, and the rotating part is driven to rotate at a high speed by the motor; one end of each connecting support is arranged on the rotating part at intervals, and the other end of each connecting support is fixedly connected with the backwashing device.

7. The sea sand desalination-based treatment process according to claim 2, characterized in that: the vibration screening device is integrated with the cleaning device.