CN113060960A - Efficient environment-friendly sea sand desalination treatment process and system - Google Patents
Efficient environment-friendly sea sand desalination treatment process and system Download PDFInfo
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- CN113060960A CN113060960A CN202110283612.6A CN202110283612A CN113060960A CN 113060960 A CN113060960 A CN 113060960A CN 202110283612 A CN202110283612 A CN 202110283612A CN 113060960 A CN113060960 A CN 113060960A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/068—Specific natural sands, e.g. sea -, beach -, dune - or desert sand
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Abstract
The invention relates to a high-efficiency environment-friendly sea sand desalination treatment process and a system, and the specific process comprises the following steps: 1) the raw material sea sand is conveyed to a raw material sand storage yard; 2) sea sand in the raw material sand storage yard is sent into a screening device for screening, and the sea sand passing through the screening device is conveyed to a first sand washing pool; 3) after primary desalting in the sand washing pool I, desalting sea sand of a semi-finished product, and feeding the desalted sea sand into a sand washing pool II; 4) after the second-stage desalinization in the sand washing pool, the semi-finished desalinized sea sand enters a third sand washing pool; 5) and after three-level desalination in the sand washing tank, the finished product desalinated sea sand is conveyed to a finished product sand storage yard. The system comprises a sea sand feeding system, a sea sand screening system and a sea sand desalting system. The invention adopts a three-level sea sand desalination treatment process, and the desalinated sea sand has better desalination quality and can meet the use requirement of national standard specifications on desalinated sea sand; the system can obtain sand with better gradation, and the sand has excellent shape and good gradation, and is suitable for preparing various grades of concrete.
Description
Technical Field
The invention belongs to the technical field of sea sand desalination, and particularly relates to a high-efficiency environment-friendly sea sand desalination treatment process and system.
Background
The sand is an important component of concrete, along with the rapid development of economy, the demand of the concrete is gradually increased, the demand of the sand is also increased day by day, and the contradiction between the supply and demand of river sand resources is increasingly prominent. The excessive exploitation of river sand causes serious damage to the environment, so that the country pays more attention to the serious damage, and various measures are limited by continuous production. Compared with river sand, the sea sand has rich resource reserves, good grading and convenient exploitation. However, the sea sand contains a large amount of chloride, and if the sea sand is directly used without dechlorination, the corrosion of the steel bars in the reinforced concrete structure is aggravated, the steel bars are continuously corroded, the strength of the reinforced concrete is further reduced, and the concrete protective layer is peeled off or the steel bars are cracked. The sea sand which is not purified easily causes early corrosion of reinforcing steel bars in concrete, and serious hidden quality troubles are buried in the building engineering. Therefore, the primary problem of using sea sand resources in buildings is to desalt the sea sand.
A lot of 'sea sand houses' appear in China and abroad due to abuse or misuse of sea sand, and great economic loss and severe social influence are caused. The technical specification of sea sand concrete application improves the requirement on the content of chloride ions in sea sand, and the ion content of the sea sand is regulated to be not more than 0.03 percent. Meanwhile, higher requirements are also put forward on the chloride ion content of other raw materials (cement, mixing water and the like) so as to achieve the purpose of strict control. The chloride ion content of sand in JGJ 52-2006 Standard for quality and inspection method of common concrete is stipulated as mandatory provisions: the content of chloride ions in the sand for reinforced concrete is not more than 0.06 percent; the content of chloride ions in the sand for prestressed reinforced concrete is not more than 0.02 percent. Desalination of sea sand is an essential step in using sea sand in construction engineering. The sea sand in the nature has good gradation, the conventional sea sand desalination treatment process only keeps the coarse sand part, and the medium sand or the fine sand part is wasted.
The sea sand desalting method includes natural stacking method, mechanical method, fresh water flushing method, chemical reaction method, etc. The natural stacking method has the advantages of simple operation but large required field, and the mechanical method is used for desalting sea sand by multiple working procedures of mechanical equipment in a grading manner, and has the advantages of high construction cost and serious water consumption while ensuring the quality. In the research on the performance and novel purification process of sea sand, which is published in journal of fly ash (1007 + 046X (2011)) 05-0012-03 in 5 months 2011 by forest peak and the like, a sea sand desalination process is provided, in the process, waste water after secondary fresh water washing enters a first washing procedure again, so that the water resource recycling is realized, but after multiple times of utilization, chlorine salt in water is gradually increased, and the sea sand desalination effect is gradually weakened and cannot meet the requirement. If the fresh water can not be recycled, the use amount of the fresh water is too large. Chinese patent publication No. CN105110668A, entitled "sea sand desalination treatment process and system", also proposes a sea sand desalination process, in which ozone water is used for heating in the sea sand desalination and dechlorination part, and the key point of the method is the dechlorination capability of the dechlorinating agent to the sea sand, but the dechlorination effect to the sea sand with large mud content or the sea sand with more colloid is difficult to ensure.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-efficiency environment-friendly sea sand desalination treatment process and system which have the characteristics of good desalination effect, excellent sand-soil gradation, convenient realization, water saving, environment friendliness and the like.
The invention is realized in this way, a high-efficiency environment-friendly sea sand desalination treatment process, which comprises the following steps:
1) the raw material sea sand is conveyed to a raw material sand storage yard;
2) sea sand in a raw material sand storage yard is sent into a screening device for screening, and the sea sand passing through the screening device is conveyed to a first sand washing pool of a sea sand desalination system;
3) after primary desalting in the first sand washing pool, feeding the semi-finished desalted sea sand into a second sand washing pool of a sea sand desalting system;
4) after the second-stage desalination of the second sand washing pool, the semi-finished product desalinated sea sand enters a third sand washing pool of a sea sand desalination system;
5) and after three-stage desalination in the sand washing tank III, the finished product desalinated sea sand is conveyed to a finished product sand storage yard.
Preferably, in the step 2), the impurities which do not pass through the screening device are transported to a waste storage yard.
Preferably, in the steps 3), 4) and 5), the wastewater desalinated by each sand washing tank enters a recovery tank.
Preferably, the wastewater entering the recovery tank is subjected to fine sand recovery through a recovery machine, the recovered fine sand is conveyed to a finished sand storage yard, and the discharged wastewater enters the sedimentation tank.
Preferably, the wastewater entering the sedimentation tank is precipitated, the slurry is subjected to pressure filtration to form a filter cake, and the rest of tail water enters the filter tank with the reverse osmosis membrane, is filtered and then enters the sand washing tank again to desalt the sea sand.
Preferably, in the steps 3), 4) and 5), the desalination method of the first-stage desalination, the second-stage desalination and the third-stage desalination is one of a fresh water flushing method, a mechanical vibration method and a chemical reaction method.
Preferably, in the steps 3) and 4), the desalted semi-finished desalted sea sand is continuously stirred and mixed and then is sent to a next-level sand washing tank.
A high-efficiency environment-friendly sea sand desalination treatment system comprises a sea sand feeding system, a sea sand screening system and a sea sand desalination system;
the sea sand feeding system comprises a sand carrier and a raw material sand storage yard, wherein the sand carrier is connected with the raw material sand storage yard;
the sea sand screening system comprises a screening device, the raw material sand storage yard is connected with an inlet of the screening device, and an impurity outlet of the screening device is connected with the waste material storage yard;
the sea sand desalting system comprises three-level sea sand dechlorination equipment and two-level fine sand recovery equipment, the three-level sea sand dechlorination equipment comprises a first sand washing tank, a second sand washing tank and a third sand washing tank, a sea sand outlet of the screening device is connected with the first sand washing tank, the first sand washing tank is connected with the second sand washing tank, the second sand washing tank is connected with the third sand washing tank, and the third sand washing tank is connected with a finished product sand yard;
the two-stage fine sand recovery equipment comprises a first recovery tank, a first recovery machine, a second recovery tank and a second recovery machine, wherein wastewater outlets of the first sand washing tank and the second sand washing tank are connected with the first recovery tank, the first recovery tank is connected with the first recovery machine, fine sand in the first recovery tank is recovered through the first recovery machine, a wastewater outlet of the third sand washing tank is connected with the second recovery tank, the second recovery tank is connected with the second recovery machine, and fine sand in the second recovery tank is recovered through the second recovery machine;
sea sand outlets of the first recovery machine and the second recovery machine are connected with a finished product sand storage yard, and waste water outlets of the first recovery machine and the second recovery machine are connected with a sedimentation tank; and the sedimentation tank is connected with the sand washing tank I.
Preferably, the sedimentation tank is provided with a filter pressing device and a filter tank, and the filter tank is provided with a reverse osmosis membrane.
Preferably, the first sand washing tank is connected with the second sand washing tank through the first stirring barrel, and the second sand washing tank is connected with the third sand washing tank through the second stirring barrel.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the invention adopts a three-stage sea sand desalination treatment process, and the desalinated sea sand has better desalination quality and can meet the use requirement of national standard specifications on desalinated sea sand.
2. The sea sand desalination treatment system can obtain sand materials with better gradation, particularly the recovery of fine silt. The sand grains after sea sand desalination have excellent shape and good gradation, and are suitable for preparing various grades of concrete.
3. The invention adopts a multi-stage water-sand separation device and desalting equipment containing salt water, realizes the recycling of water used in the sea sand desalting production line, saves water resources, and is more energy-saving and environment-friendly.
Drawings
Fig. 1 is a flow chart of a sea sand desalination processing system provided in embodiment 1 of the present invention.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
in the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "a," "an," "two," "three," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
The embodiment of the invention provides a high-efficiency environment-friendly sea sand desalination treatment process, which comprises the following steps:
1) the raw material sea sand is conveyed to a raw material sand storage yard;
2) sea sand in a raw material sand storage yard is sent into a screening device for screening, the sea sand passing through the screening device is conveyed to a first sand washing pool of a sea sand desalination system, and impurities not passing through the screening device are conveyed to a waste material storage yard;
3) after primary desalination in the first sand washing pool, continuously stirring and mixing semi-finished desalted sea sand, and then feeding the semi-finished desalted sea sand into a second sand washing pool of a sea sand desalting system, wherein desalted waste water is fed into a recovery pool;
4) after the second-stage desalination of the second sand washing pool, the semi-finished product desalinated sea sand is continuously stirred and mixed and then enters a third sand washing pool of a sea sand desalination system, and the desalinated wastewater enters a recovery pool;
5) and after three-stage desalination in the sand washing tank III, the finished product desalinated sea sand is conveyed to a finished product sand storage yard, and the desalinated waste water enters a recovery tank.
In a preferred embodiment, the wastewater entering the recovery tank is subjected to fine sand recovery through a recovery machine, the recovered fine sand is conveyed to a finished sand storage yard, and the discharged wastewater enters a sedimentation tank. And after the wastewater entering the sedimentation tank is precipitated, the slurry is subjected to pressure filtration to form a filter cake, and the rest of tail water enters a filter tank with a reverse osmosis membrane, is filtered and then enters the sand washing tank again for sea sand desalination.
As shown in fig. 1, the high-efficiency environment-friendly sea sand desalination treatment system of the invention comprises a sea sand feeding system, a sea sand screening system and a sea sand desalination system, wherein in the sea sand feeding system, a sand carrier or other sea sand feeding devices carry untreated sea sand to be placed in a raw material sand storage yard, the raw material sea sand in the raw material sand storage yard reaches the screening device of the sea sand screening system through a first conveyor belt, the screening device separates impurities in the sea sand, such as shells, gravels and the like, the separated impurities reach a waste material storage yard through a second conveyor belt, and the sea sand without impurities enters the sea sand desalination system for sea sand desalination.
The sea sand feeding system comprises a sand carrier, a raw material sand storage yard and a first conveying belt, wherein the raw material sea sand comprises gravels with larger particle diameters and sand grains with smaller particle diameters, and the pure natural sea sand has excellent gradation after being subjected to the actions of seawater scouring, rolling, collision and the like. The sea sand contains silicon dioxide, and also contains small amounts of chloride ions, sodium, magnesium, calcium and the like. One of the main uses of sea sand is as fine aggregate for engineering construction. Because the salinity chloride ions in the sea sand can erode the reinforcing steel bars, potential safety hazards are brought to the engineering. Sea sand is excavated and loaded to a sand carrier by a cutter suction dredger, a drag suction dredger or a sand extraction ship, and the sea sand is placed in a raw sand yard which is generally arranged at the sea or the shore, so that the sand carrier can conveniently place the sea sand in the raw sand yard.
In a preferred example, the sea sand feeding system further comprises a sand carrier, and the sand carrier is connected with the raw material sand dump through the sand carrier. Sea sand in the sand carrier reaches the raw material sand storage yard through the sand carrier, and the sand carrier can keep a certain distance from the raw material sand storage yard, so that the space rationality of arrangement of the sea sand desalting equipment is increased. Similarly, if the distance between the raw material sand yard and the sea is increased, the cost of sea sand desalination will be increased, and the raw material sand yard is generally arranged on the shore.
After the sea sand is placed in a raw material sand storage yard, because the gaps in the sea sand are large and the permeability coefficient is large, the seawater in the sea sand is gradually discharged through seepage action and then is collected to a specified drainage pipeline. The piled sea sand enters the first conveyor belt in a mode of first near and then far, wherein the mode of first near and then far means that the sea sand placed first enters the first conveyor belt, and the sea sand placed later enters the first conveyor belt, so that the sea sand entering the screening device through the first conveyor belt has a smaller water content.
The sea sand screening system comprises a screening device, a second conveyor belt and a waste storage yard, wherein a sea sand outlet of the screening device is connected with a first sand washing pool, an impurity outlet of the screening device is connected with the waste storage yard through the second conveyor belt, sea sand passing through the screening device enters the first sand washing pool of the sea sand desalting system to be desalted, and the sea sand which cannot pass through the screening device enters the second conveyor belt and is then conveyed to the waste storage yard.
Sea sand may contain shell, gravel, etc. in addition to chloride salt, and may contain partial clay or calcium component. The rotary screening device fully stirs and cleans the sea sand and screens and removes impurities such as stones and shells with larger diameters. The screening device can select a drum screen with cylindrical screen cylinders, the number of the screen cylinders can be one or more than one, and when a plurality of screen cylinders are arranged, the screening speed and the screening efficiency can be obviously improved. The axis of the screen drum can be designed to have a certain angle with the horizontal plane, the design angle is 10-15 degrees, under the rotation action of the screen drum, the sea sand particles with the particle diameter smaller than the aperture of the screen drum are thrown out by the centrifugal action, and the thrown sea sand particles enter a first sand washing pool; the sea sand impurity that particle diameter is greater than a sieve section of thick bamboo aperture stays inside a sieve section of thick bamboo, and under the effect of gravity, large granule sea sand impurity such as these gravel, shells removes along a sieve section of thick bamboo, then gets into the impurity export, and the impurity export is connected with conveyer belt two, and large granule sea sand impurity such as gravel, shells gets into conveyer belt two, gets into the waste material storage yard at last.
Since the composition of the sea sand is not constant, there may be larger gravel particles and some coral pieces, which cannot be discharged through the screen drum into the impurity outlet and then into the second conveyor belt and then into the waste dump. Therefore, in actual work, the included angle between the axis of the screen cylinder and the horizontal plane can be adjusted according to actual conditions, so that the effect of discharging sea sand impurities is the best.
The sea sand desalting system comprises three-level sea sand dechlorination equipment and two-level fine sand recovery equipment, the three-level sea sand dechlorination equipment comprises a first sand washing tank, a second sand washing tank and a third sand washing tank, a sea sand outlet of the screening device is connected with the first sand washing tank, the first sand washing tank is connected with the second sand washing tank, the second sand washing tank is connected with the third sand washing tank, and the third sand washing tank is connected with a finished product sand yard; the two-stage fine sand recovery equipment comprises a first recovery tank, a first recovery machine, a second recovery tank and a second recovery machine, wherein wastewater outlets of the first sand washing tank and the second sand washing tank are connected with the first recovery tank, the first recovery tank is connected with the first recovery machine, fine sand in the first recovery tank is recovered through the first recovery machine, the recovered fine sand enters a finished product sand yard, a wastewater outlet of the third sand washing tank is connected with the second recovery tank, the second recovery tank is connected with the second recovery machine, the fine sand in the second recovery tank is recovered through the second recovery machine, and the recovered fine sand enters the finished product sand yard; sea sand outlets of the first recycling machine and the second recycling machine are connected with a finished product sand storage yard, and waste water outlets of the first recycling machine and the second recycling machine are connected with a sedimentation tank.
Specifically, the sea sand desalination system comprises a first sand washing tank, a first chain bucket machine, a first stirring barrel, a second sand washing tank, a second chain bucket machine, a second stirring barrel, a first recovery tank, a first recovery machine, a third sand washing tank, a third chain bucket machine, a second recovery tank, a second recovery machine and a sedimentation tank. Sea sand still needs to pass through raw materials sand storage yard, conveyer belt one, screening plant, washing sand pond one, chain bucket machine one, agitator one, washing sand pond two, chain bucket machine two, agitator two, washing sand pond three, chain bucket machine three, conveyer belt three in proper order from fortune sand ship to finished product sand storage yard. The sea sand desalting and dechlorinating device is characterized in that the first sand washing tank, the second sand washing tank and the third sand washing tank are used for sea sand desalting or dechlorinating, the first chain bucket machine, the second chain bucket machine and the third chain bucket machine are used for carrying sea sand after desalting treatment, the first stirring barrel and the second stirring barrel are used for stirring the sea sand, the first recovery tank, the first recovery machine, the second recovery tank and the second recovery machine are used for recovering the sea sand, the sedimentation tank is used for desalting water, and the sedimentation tank is communicated with the first sand washing tank, so that the water is recycled, and the sea sand desalting and dechlorinating device is more energy-saving and environment-friendly.
In a preferred embodiment, the first sand washing tank is connected with the screening device, the first chain bucket machine and the first recovery tank, the first chain bucket machine is connected with the first stirring barrel, the first recovery tank is connected with the first recovery machine, and the first recovery machine is connected with the third conveyor belt and the sedimentation tank. Directly feeding the sea sand particles passing through the screening device into a first sand washing tank, dechlorinating and desalting the sea sand particles in the first sand washing tank, conveying the sea sand particles to a first stirring barrel through a first chain bucket machine, and continuously mixing the sea sand particles and the sea sand particles to enter a second sand washing tank; and (4) the desalted wastewater enters a first recovery tank.
The sand washing tank II is connected with the stirring barrel I, the chain bucket machine II and the recovery tank I, and the chain bucket machine II is connected with the stirring barrel II. The sea sand particles in the first stirring barrel are stirred, mixed and then enter a second sand washing tank, the sea sand particles are dechlorinated and desalted in the second sand washing tank and then reach the second stirring barrel through the conveying action of a chain bucket machine, and the sea sand particles are continuously mixed and then enter a third sand washing tank; and (4) the desalted wastewater enters a first recovery tank.
The sand washing tank III is connected with the stirring barrel II, the chain bucket machine III and the recovery tank II, the chain bucket machine III is connected with the conveying belt III, the recovery tank II is connected with the recovery machine II, and the recovery machine II is connected with the conveying belt III and the sedimentation tank. The sea sand particles in the second stirring barrel are stirred, mixed and then enter a third sand washing pool, are dechlorinated and desalted by the third sand washing pool, then reach a third conveyor belt through the conveying action of a third chain bucket machine, and finally enter a finished product sand storage yard; and the desalted wastewater enters a second recovery tank.
In addition, chain bucket machine one, chain bucket machine two, chain bucket machine three, when specifically using, the sand hopper of chain bucket machine can choose for use to have the bucket hole, and the bucket hole can discharge the water in the sand hopper sea sand, because the hole of sea sand is great, the drainage effect is showing. In the agitator, can also release some moisture after the sea sand intensive mixing, increase the collision between the sea sand, increased the hole of sea sand at last, the going on of the follow-up sea sand processing procedure of aspect.
In this embodiment, the first sand washing tank is dechlorinated by a fresh water flushing method, and the water entering the first sand washing tank is fresh water or water subjected to desalination treatment. After the sea sand is sieved and separated, the particles are relatively uniform, the impurity content is low, but clay or silt components mixed in the sea sand also need to be removed. After the sea sand is washed by water in the sand washing pool I, clay or silt components are dissolved in the water to form slurry, and sea sand particles are precipitated because of insolubility in the water. The precipitated sea sand is soaked in fresh water, and part of chloride salt is dissolved in water, so that the chlorine content of the sea sand is reduced.
And dechlorinating in the sand washing tank II by a mechanical vibration method, wherein the water entering the sand washing tank II is fresh water or water subjected to desalination treatment. After the sea sand is dechlorinated by the sand washing tank, the chlorine content is reduced. Wash sand pool two and have vibrating device, vibrating device is located wash two one sides in sand pool, vibrating device can make the shock wave of certain frequency, the shock wave has certain energy, and sea sand surface adhesion's viscid composition or calcareous composition receive the vibration and break away from the sea sand granule, and some chloride also receive the vibration and aggravate and dissolve, and after washing two dechlorinations in sand pool, the chlorine content of sea sand further reduces.
And dechlorinating in the sand washing tank III through a chemical reaction method, wherein water entering the sand washing tank III is fresh water or water subjected to desalination treatment. After the sea sand is subjected to dechlorination in the first sand washing tank and dechlorination in the second sand washing tank, the chlorine content is already low. Wash sand pool three and have the dechlorination device, the dechlorination device is located three one sides in sand washing pool, the dechlorination device has the dosing unit, and the dosing unit can make the dechlorination agent of certain concentration, and the dechlorination agent can take place chemical reaction with the chlorine salt that remains the sea sand surface, makes the chlorine salt consumed gradually, then after three dechlorinations in sand washing pool, the chlorine content of sea sand further reduces, and sea sand chloridion content at this moment can satisfy the requirement of national standard.
Preferably, the sand washing tank III for dechlorination by a chemical reaction method is provided with a chlorine gas recovery device, the chlorine gas recovery device is provided with an iron block, the chlorine gas recovery device absorbs chlorine gas as a solvent through a ferrous chloride solution, the solvent has strong chlorine gas absorption capacity, the ferrous chloride absorbs the chlorine gas to generate ferric chloride, and the ferric chloride solution can react with iron in the chlorine gas recovery device to generate ferrous chloride, so that the concentration of the ferrous chloride is continuously increased along with the absorption of the chlorine gas. The chlorine gas recovery device has strong solution self-renewal capacity and can be recycled. After chlorine is subjected to harmless treatment, the method is safer, more energy-saving and more environment-friendly.
The two-stage fine sand recovery comprises fine sand recovery in a first recovery tank and fine sand recovery in a second recovery tank, wherein the fine sand recovery in the first recovery tank is carried out sea sand recovery through a first recovery machine, the fine sand recovery in the second recovery tank is carried out sea sand recovery through a second recovery machine, the recovered sea sand enters a third conveying belt and finally enters a finished product sand storage yard. For example, after the second sand washing pool is dechlorinated, water and sand are separated, the dechlorinated sea sand is carried into the second stirring barrel by the second chain bucket machine, waste water carrying chlorine salt enters the first recovery pool, the waste water contains partial sea sand, and the sea sand mainly comprises fine sand and silt sand.
The first recovery machine can adopt a sand-water separator, a fine sand recovery machine or a spiral-flow type sand-water separator and the like, and preferably adopts a spiral-flow type sand-water centrifugal separator for recovering fine powder sand, and the specific working principle is as follows: the separation of the sand-water mixture under high-speed rotation is realized by utilizing centrifugal force, the sand-water mixture is pushed into the reclaimer at a higher speed by utilizing external pressure, and the sand-water mixture moves along the tangential direction of the reclaimer, so that water is driven to rotate along the cylinder wall. The particles in the rotational flow are acted by centrifugal force, the density of the particles is higher than that of the liquid around, the centrifugal force is higher and higher, once the centrifugal force is higher than the liquid resistance generated by the movement, the particles can overcome the resistance to move towards the wall of the device and are separated from the liquid around, the particles reaching the vicinity of the wall of the device are pushed by the liquid above the reclaimer to move downwards along the wall of the device, and finally the particles are discharged from the bottom flow port. The separated liquid rotates downwards to continue moving, and after entering the conical section, the liquid rotating speed is accelerated because the inner diameter of the recovery machine is gradually reduced. Due to the uneven pressure distribution of the liquid in the radial direction when the vortex is generated, the pressure distribution becomes smaller closer to the axis and is about zero when reaching the axis. Becomes a low pressure zone or even a vacuum zone, causing the liquid to tend to move in the axial direction. Meanwhile, because the bottom flow port of the reclaimer is greatly reduced, the liquid can not be quickly discharged from the bottom flow port, the center of the top cover of the reclaimer is provided with an overflow port, and because of the low-pressure area, a part of the liquid moves towards the overflow port, so that upward rotary motion is formed and the liquid is discharged from the overflow port.
And the fine sand recovery in the first recovery tank is to recover sea sand through a first recovery machine, and the sea sand discharged from a bottom flow port of the first recovery machine enters a third conveyor belt and then is collected to a finished sand storage yard. Waste water discharged from an overflow port of the first recovery machine enters a sedimentation tank, the chlorine salt content in the waste water is high, the waste water can enter the first sand washing tank again through the desalting function of the sedimentation tank, the next batch of sea sand needing desalting is washed, and the cyclic utilization of water resources is realized.
And recovering the fine sand in the second recovery tank by a second recovery machine to recover sea sand, and enabling the recovered sea sand to enter a third conveyor belt and then be collected to a finished product sand storage yard. Most of the sea sand is subjected to water-sand separation after dechlorination in the sand washing tank III, the dechlorinated sea sand is conveyed to the conveyor belt III by the chain bucket machine III, the waste water carrying chlorine salt and part of the sea sand enters the recovery tank II, and the sea sand mainly comprises fine sand and silt. The second recovery machine and the first recovery machine have the same working principle, and the sea sand discharged from the bottom flow port of the second recovery machine enters the third conveyor belt and then is collected to a finished sand storage yard. Waste water discharged from an overflow port of the second recovery machine enters the sedimentation tank, and the waste water is high in chloride content and needs to be treated through a desalting function of the sedimentation tank, so that the treated waste water is low in salt content and can enter the first sand washing tank again to wash subsequent sea sand, and the cyclic utilization of water resources is realized.
The effect of sedimentation tank is the cyclic utilization who realizes the water resource, and the waste water that gets into the sedimentation tank not only contains more chlorine salt, still has partial mud, and these mud pass through filter pressing device's filter-pressing effect, and earth in the mud becomes the mud cake of consolidation state, and the filter tank of sedimentation tank is passed through to remaining tail water, and the filter tank has reverse osmosis membrane, and these reverse osmosis membrane can prevent that chloride ion from spilling over, consequently does not contain chloride ion in the aquatic through the filter tank. The filter tanks can be arranged into a plurality of filter tanks according to the scale, so that the desalting efficiency of the sedimentation tank is improved. It is noted that reverse osmosis membranes need to be replaced periodically depending on the application.
And the third conveyor belt is connected with a finished product sand yard, and the content of chlorine salt in the sea sand is reduced to the minimum after three-stage dechlorination. The average content of chloride ions in the desalted sea sand is 0.001 percent. The chlorine ion content of the sea sand is not more than 0.03% according to the requirements of the chlorine ion content in the sea sand in the technical Specification for application of sea sand concrete, and the chlorine removal effect of the sea sand is far superior to the national standard and meets the requirements of the building industry.
In a preferable example, a three-level sea sand desalting treatment process is adopted, a fresh water flushing method, a mechanical vibration method and a chemical reaction method are respectively and sequentially adopted, the desalted sea sand has less chloride ions, the content of the chloride ions is far higher than the national standard, and the manufactured concrete is better and can meet the requirements of the building market.
The sea sand desalination treatment system adopts two-stage fine sand recovery measures, and can obtain the natural gradation of the sea sand to the maximum extent. The sand material can be better covered by coarse sand, medium sand, fine sand, silt and the like with full grain size. The sand grains after sea sand desalination have excellent shape and good gradation, improve the workability of concrete and are suitable for preparing concrete.
The sea sand desalination treatment system adopts a multi-stage water-sand separation device, separated water enters the sand washing tank again under the desalination effect of the sedimentation tank, and water resources can be reused after treatment, so that the water resource can be recycled, and the water for sea sand desalination is saved. In a preferred embodiment, chlorine salt in the sea sand is dissolved in water, then is changed into chlorine gas, and finally is subjected to harmless treatment by a chlorine gas recovery device, so that the energy is saved, and the environment is protected.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (10)
1. An efficient environment-friendly sea sand desalination treatment process is characterized by comprising the following steps:
1) the raw material sea sand is conveyed to a raw material sand storage yard;
2) sea sand in a raw material sand storage yard is sent into a screening device for screening, and the sea sand passing through the screening device is conveyed to a first sand washing pool of a sea sand desalination system;
3) after primary desalting in the first sand washing pool, feeding the semi-finished desalted sea sand into a second sand washing pool of a sea sand desalting system;
4) after the second-stage desalination of the second sand washing pool, the semi-finished product desalinated sea sand enters a third sand washing pool of a sea sand desalination system;
5) and after three-stage desalination in the sand washing tank III, the finished product desalinated sea sand is conveyed to a finished product sand storage yard.
2. The process of claim 1, wherein in step 2), the impurities which do not pass through the screening device are transported to a waste storage yard.
3. The process for desalinating sea sand in an efficient and environment-friendly manner according to claim 1, wherein in the steps 3), 4) and 5), the wastewater desalinated by each sand washing tank enters a recovery tank.
4. The process for desalinating sea sand in an efficient and environment-friendly manner as claimed in claim 3, wherein the wastewater entering the recovery tank is subjected to fine sand recovery by a recovery machine, the fine sand after recovery is transported to a finished sand storage yard, and the discharged wastewater enters a sedimentation tank.
5. The process for desalinating sea sand in high-efficiency and environment-friendly manner according to claim 4, wherein the wastewater entering the sedimentation tank is precipitated, the slurry is subjected to pressure filtration to form a filter cake, and the rest of tail water enters a filter tank with a reverse osmosis membrane, is filtered and then enters the sand washing tank again for desalinating sea sand.
6. The process for desalinating sea sand in an efficient and environment-friendly manner as claimed in claim 1, wherein in the steps 3), 4) and 5), the desalinating method of the primary desalinating method, the secondary desalinating method and the tertiary desalinating method is one of a fresh water flushing method, a mechanical vibration method and a chemical reaction method.
7. The process for desalinating sea sand in an efficient and environment-friendly manner according to claim 1, wherein in the steps 3) and 4), the desalinated semi-finished product desalinated sea sand is continuously stirred and mixed and then is sent to a next-stage sand washing tank.
8. A high-efficiency environment-friendly sea sand desalination treatment system is characterized by comprising a sea sand feeding system, a sea sand screening system and a sea sand desalination system;
the sea sand feeding system comprises a sand carrier and a raw material sand storage yard, wherein the sand carrier is connected with the raw material sand storage yard;
the sea sand screening system comprises a screening device, the raw material sand storage yard is connected with an inlet of the screening device, and an impurity outlet of the screening device is connected with the waste material storage yard;
the sea sand desalting system comprises three-level sea sand dechlorination equipment and fine sand recovery equipment, the three-level sea sand dechlorination equipment comprises a first sand washing tank, a second sand washing tank and a third sand washing tank, a sea sand outlet of the screening device is connected with the first sand washing tank, the first sand washing tank is connected with the second sand washing tank, the second sand washing tank is connected with the third sand washing tank, and the third sand washing tank is connected with a finished product sand yard;
the fine sand recovery equipment comprises a first recovery tank, a first recovery machine, a second recovery tank and a second recovery machine, wherein wastewater outlets of the first sand washing tank and the second sand washing tank are connected with the first recovery tank, the first recovery tank is connected with the first recovery machine, fine sand in the first recovery tank is recovered through the first recovery machine, a wastewater outlet of the third sand washing tank is connected with the second recovery tank, the second recovery tank is connected with the second recovery machine, and fine sand in the second recovery tank is recovered through the second recovery machine;
sea sand outlets of the first recovery machine and the second recovery machine are connected with a finished product sand storage yard, and waste water outlets of the first recovery machine and the second recovery machine are connected with a sedimentation tank; and the sedimentation tank is connected with the sand washing tank I.
9. The system for desalinating sea sand in high-efficiency and environment-friendly manner as claimed in claim 8, wherein said sedimentation tank is provided with a filter pressing device and a filter tank, and said filter tank is provided with a reverse osmosis membrane.
10. The system for desalinating sea sand in an environment-friendly and efficient manner according to claim 8, wherein the first sand washing tank is connected with the second sand washing tank through the first stirring barrel, and the second sand washing tank is connected with the third sand washing tank through the second stirring barrel.
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