Sea sand dechlorination device based on replaceable high-performance cement-based electrode plate

Abstract

A sea sand dechlorination device based on replaceable high-performance cement-based electrode plates comprises the cement-based electrode plates, a sea sand dechlorination channel body and sea sand stirring blades, electrode plate clamping grooves are formed in the inner walls of the two sides of the sea sand dechlorination channel body, and the cement-based electrode plates are installed in the electrode plate clamping grooves; a water inlet is formed in one side of the sea sand dechlorination channel main body, a water outlet is formed in the other side of the sea sand dechlorination channel main body, and the sea sand stirring blades are located in a channel of the sea sand dechlorination channel main body; the cement-based electrode plate is made of an aggregate modified cement-based material coated with synthetic nano graphene. The electrode can be replaced, the dechlorination efficiency is high, and intelligent control is achieved.

Description

Technical Field

[0001] This invention relates to the field of marine sand resource utilization technology, specifically to an electrochemical dechlorination device based on replaceable high-performance cement-based electrode plates, which is particularly suitable for rapid and efficient dechlorination treatment of marine sand with high chloride ion content, realizing the environmentally friendly recycling of construction sand. Background Technology

[0002] Rapid infrastructure development has led to a surge in demand for construction sand, but high-quality river sand resources are nearing depletion. While abundant nearshore sea sand can serve as a substitute, its high chlorine content can severely accelerate the corrosion of steel reinforcement in reinforced concrete, threatening structural safety and service life. Traditional sea sand dechlorination technologies, such as freshwater flushing and electric field adsorption, suffer from drawbacks including high freshwater consumption, high energy costs, and very limited dechlorination efficiency. These technologies are no longer sufficient to meet the current engineering requirements for rapid, energy-efficient, highly efficient, and integrated control processes in sea sand dechlorination.

[0003] Existing sea sand washing equipment suffers from the following technical challenges:

[0004] 1. Huge water consumption: per 1m³ of water treated 3 Sea sand requires more than 1.5 tons of fresh water, and its long-term use is unsustainable.

[0005] 2. Large wastewater output: After flushing, a large amount of chlorine-containing wastewater is generated. In a million-ton-level project, the chloride ion concentration can reach 8106.35 tons / year, which requires the construction of sedimentation tanks and electrolysis treatment facilities, increasing costs and easily causing secondary pollution;

[0006] 3. Low efficiency: The bucket filter method requires 0.8 tons of water / m³. 3 The scattered water method requires 0.2 tons of water / m³ 3 However, it still requires a 12–24 hour processing cycle, which cannot meet urgent needs.

[0007] In comparison, while traditional electric field sea sand dechlorination devices improve efficiency and reduce water consumption to some extent, they also have significant drawbacks:

[0008] 1. High cost: Electrolytic dechlorination requires continuous electrolysis. A single industrial unit typically has a power output of 280KW. At 75% load, the electricity cost for processing 1 cubic meter of sea sand is approximately 1.2 yuan / m³. Adding labor, equipment depreciation, and other costs, the total cost reaches 3.6 yuan / m³. 3 The cost is significantly higher than that of physical flushing (approximately 1.5 yuan / m³). 3 );

[0009] 2. Unstable dechlorination effect: The electric field method has a low removal rate of attached chloride ions (such as organic chlorides), and the residual chloride ion content after treatment fluctuates greatly. Some batches still reach 0.03%-0.06%, which is close to the standard limit (0.01%-0.03%). It is necessary to detect the chloride ion concentration every hour, but in actual engineering, due to the detection lag, the risk rate of exceeding the standard is as high as 15%.

[0010] 3. Difficult equipment maintenance: Electrode corrosion is often very severe in electric field dechlorination. The lifespan of the anode mesh plate in the salt spray environment is only 6-12 months, and the replacement cost accounts for 40% of the annual maintenance cost.

[0011] The existing Chinese patent CN111196692A proposes a sea sand dechlorination electrolysis box that relies on precise electric field control and requires the coordinated operation of multiple components such as anode mesh, diaphragm, and cathode plate. This results in low operational error tolerance and limited industrial application cases. The Chinese patent CN114798571B proposes a sea sand dechlorination method combining freshwater rinsing and chemical methods. While this reduces freshwater consumption, it uses medium- to high-risk reagents such as benzoyl peroxide and 4-vinylbenzoic acid, posing significant safety risks. The Chinese patent CN215142784U proposes a high-efficiency, energy-saving sea sand dechlorination system. Although this system boasts high production efficiency and low energy consumption, its dechlorination stability is lacking. None of these existing technologies simultaneously optimize efficiency, freshwater and electricity consumption, or system integration, making it difficult to meet the current engineering requirements for efficient, environmentally friendly, and low-energy-consumption sea sand dechlorination.

[0012] Therefore, there is an urgent need for a new type of sea sand dechlorination device with high dechlorination efficiency, low process pollution, low energy consumption, and integrated multi-functional system to meet the future engineering field's resource demand for sea sand to replace river sand. Summary of the Invention

[0013] To overcome the shortcomings of existing sea sand dechlorination methods, such as high dependence on freshwater for rinsing and soaking, short electrode life of electrochemical methods, and insufficient intelligence and integration, this invention provides a sea sand dechlorination device based on replaceable high-performance cement-based electrode plates. The electrode plates are made of graphene-modified high-performance cement-based materials, and a feasible integrated sea sand dechlorination device with replaceable electrodes, high dechlorination efficiency, and intelligent control is designed to solve problems such as electrode corrosion, high energy consumption, and crude process control.

[0014] The technical solution adopted by this invention to solve its technical problem is:

[0015] A sea sand dechlorination device based on replaceable high-performance cement-based electrode plates includes a cement-based electrode plate, a sea sand dechlorination channel body, and sea sand stirring blades. Electrode plate slots are provided on both inner walls of the sea sand dechlorination channel body, and the cement-based electrode plate is installed in the electrode plate slots. An inlet is provided on one side of the sea sand dechlorination channel body, and an outlet is provided on the other side. The sea sand stirring blades are located in the channel of the sea sand dechlorination channel body. The cement-based electrode plate is made of aggregate-modified cement-based material coated with synthetic nano-graphene.

[0016] Furthermore, the aggregate-modified cementitious material is composed of the following parts by weight: 450 parts of 525 cement, 1300-1400 parts of 20-70 mesh fine aggregate, 2-6 parts of graphene, 1-2 parts of ultra-fine steel fiber, 6-9 parts of ultra-high molecular weight polyethylene (UHMWPE) fiber, and 170-190 parts of other materials.

[0017] Preferably, in the 20-70 mesh fine aggregate, 20-40 mesh accounts for 25%-35%, and 40-70 mesh accounts for 65%-75%.

[0018] The cement is Portland cement of type 52.5, with a 28-day compressive strength ≥ 52.5 MPa and a specific surface area ≥ 300 m². 2 / kg; the fine aggregate is 20-70 mesh quartz sand with a silica content ≥98%; the graphene is highly conductive graphene with a specific surface area of ​​50-60m². 2 / g, four-probe test of film conductivity ≥200S / cm.

[0019] The ultrafine steel fiber monofilament has a diameter of 20μm, a length of 6-12mm, and a tensile strength greater than 2600MPa; the ultra-high molecular weight polyethylene fiber monofilament has a diameter of 14μm, a length of 6-12mm, an elastic modulus ≥120GPa, and a tensile strength greater than 3.0GPa.

[0020] The fine aggregate is grown by attaching phenolic resin as a site to grow a nano-graphene layer, which fills some of the defects in the aggregate; the ultrafine steel fibers are surface-oxidized at 30°C for 30 minutes to improve the bonding ability between the fibers and cement paste.

[0021] The cement-based electrode plate has a compressive strength ≥60MPa after 28 days of curing, a resistivity of less than 0.5Ωm after 28 days, and a wear resistance grade B. The length of a single piece is 1-1.5m, the width is 0.5-1.5m, and the thickness is 0.1-0.5m.

[0022] Furthermore, the sea sand dechlorination device also includes a protective net, which is installed inside the electrode plate slots. This protective net is close to but does not contact the electrode plate slots on both sides, and is typically made of stainless steel.

[0023] Furthermore, the electrode plate slot extension secures the cement-based electrode plate to the side of the channel. This extension is made of reinforced ABS resin material.

[0024] The main body of the sea sand dechlorination channel is provided with a front splicing interface and a rear splicing interface. The front and rear sea sand dechlorination devices are spliced ​​together to form the sea sand dechlorination channel.

[0025] The front splicing interface of the channel has a first channel, and the rear splicing interface of the channel has a second channel. The splicing reinforcement steel pipe passes through the second channel and the first channel for connection. The splicing reinforcement steel pipe passes through the channels at the splicing points of different adjacent units to strengthen the connection, and the shear strength of the high carbon stainless steel is >800MPa.

[0026] The sea sand dechlorination device also includes a water supply and drainage device and a multi-functional integrated control system. The water supply and drainage device consists of pipes at the inlet / outlet of the channel and an external water pump. The multi-functional integrated control system includes a power-on / power-off module, a water supply and drainage module, and a liquid chlorine content measurement module in the channel. It is remotely controlled locally or remotely through a central control panel. The electrode plate slot is provided with a reserved power port, which is electrically connected to the cement-based electrode plate and connected to the power-on / power-off module.

[0027] The beneficial effects of this invention are mainly reflected in:

[0028] 1. The main body of the sea sand dechlorination device is made of ABS resin with organosilicon modified resin coating, which has good impact resistance and heat resistance. The electrode plate used in sea sand dechlorination is made of graphene modified high-performance cement-based material, which has both durability and conductivity.

[0029] 2. The electrode plates and water supply and drainage system pipes can be assembled on-site with the main body of the sea sand dechlorination channel, and the discarded electrode plates can also be replaced on-site, making the whole system more flexible and convenient;

[0030] 3. It integrates three major systems: chlorine content detection, water supply and drainage, and power supply and shutdown. It can be uniformly controlled locally / remotely through a central control panel to achieve integrated functionality. Attached Figure Description

[0031] Figure 1 This is a two-dimensional structural diagram of the sea sand dechlorination device with replaceable high-performance cement-based electrode plates according to the present invention.

[0032] Figure 2 This is a schematic diagram of adjacent units of the sea sand dechlorination device with replaceable high-performance cement-based electrode plates according to the present invention.

[0033] Figure 3 This is an axial cross-sectional view of the electrode plate of the sea sand dechlorination device of the present invention, which has a replaceable high-performance cement-based electrode plate.

[0034] Figure 4 This is a schematic diagram of the electrode plate for the sea sand dechlorination device of the present invention, which features a replaceable high-performance cement-based electrode plate.

[0035] In the diagram: 1. Cement-based electrode plate; 2. Main body of the sea sand dechlorination channel; 3. Protective net; 4. Water outlet; 5. Water inlet; 6. Electrode plate slot; 7. Reserved power port; 8. Front splicing interface of the channel; 9. Rear splicing interface of the channel; 10. Spliced ​​reinforced steel pipe; 11. Sea sand stirring blade. Detailed Implementation

[0036] The present invention will now be further described with reference to the accompanying drawings.

[0037] Reference Figures 1-4 A sea sand dechlorination device based on replaceable high-performance cement-based electrode plates includes a cement-based electrode plate 1, a sea sand dechlorination channel body 2, and sea sand stirring blades 11. Electrode plate slots 6 are provided on both inner walls of the sea sand dechlorination channel body 1, and the cement-based electrode plate 1 is installed in the electrode plate slots 6. A water inlet 5 is provided on one side of the sea sand dechlorination channel body 1, and a water outlet 4 is provided on the other side. The sea sand stirring blades 11 are located in the channel of the sea sand dechlorination channel body 2. The cement-based electrode plate 1 is made of aggregate modified cement-based material coated with synthetic nano-graphene.

[0038] Furthermore, the aggregate-modified cementitious material is composed of the following parts by weight: 450 parts of 525 cement, 1300-1400 parts of 20-70 mesh fine aggregate, 2-6 parts of graphene, 1-2 parts of ultrafine steel fiber, 6-9 parts of ultra-high molecular weight polyethylene (UHMWPE) fiber, and 170-190 parts of water.

[0039] Preferably, in the 20-70 mesh fine aggregate, 20-40 mesh accounts for 25%-35%, and 40-70 mesh accounts for 65%-75%.

[0040] The cement is Portland cement of type 52.5, with a 28-day compressive strength ≥ 52.5 MPa and a specific surface area ≥ 300 m². 2 / kg; the fine aggregate is 20-70 mesh quartz sand with a silica content ≥98%; the graphene is highly conductive graphene with a specific surface area of ​​50-60m². 2 / g, four-probe test of film conductivity ≥200S / cm.

[0041] The ultrafine steel fiber monofilament has a diameter of 20μm, a length of 6-12mm, and a tensile strength greater than 2600MPa; the ultra-high molecular weight polyethylene fiber monofilament has a diameter of 14μm, a length of 6-12mm, an elastic modulus ≥120GPa, and a tensile strength greater than 3.0GPa.

[0042] The fine aggregate is grown by attaching phenolic resin as a site to grow a nano-graphene layer, which fills some of the defects in the aggregate; the ultrafine steel fibers are surface-oxidized at 30°C for 30 minutes to improve the bonding ability between the fibers and cement paste.

[0043] The cement-based electrode plate has a compressive strength ≥60MPa after 28 days of curing, a resistivity of less than 0.5Ωm after 28 days, and a wear resistance grade B. The length of a single piece is 1-1.5m, the width is 0.5-1.5m, and the thickness is 0.1-0.5m.

[0044] Furthermore, the sea sand dechlorination device also includes a protective net 3, which is installed on the inner side of the electrode plate slots 6. This protective net is close to but does not contact the electrode plate slots on both sides, and is typically made of stainless steel.

[0045] Furthermore, the extension portion of the electrode plate slot 6 secures the cement-based electrode plate 1 to the side of the channel. This extension portion is made of reinforced ABS resin material.

[0046] The main body of the sea sand dechlorination channel is provided with a front splicing interface 8 and a rear splicing interface 9. The front and rear sea sand dechlorination devices are spliced ​​together to form the sea sand dechlorination channel.

[0047] The front splicing interface 8 of the channel has a first channel, and the rear splicing interface 9 of the channel has a second channel. The splicing reinforcement steel pipe 10 passes through the second channel and the first channel for connection. The splicing reinforcement steel pipe passes through the channels at the splicing points of different adjacent units to strengthen the connection, and the shear strength of the high carbon stainless steel is >800MPa.

[0048] The sea sand dechlorination device also includes a water supply and drainage device and a multi-functional integrated control system. The water supply and drainage device consists of pipes at the inlet / outlet of the channel and an external water pump. The multi-functional integrated control system includes a power-on / power-off module, a water supply and drainage module, and a liquid chlorine content measurement module in the channel. It is remotely controlled locally or remotely through a central control panel. The electrode plate slot 6 is provided with a reserved power port 7, which is electrically connected to the cement-based electrode plate and connected to the power-on / power-off module.

[0049] The sea sand dechlorination device is equipped with no fewer than four monitoring points for solution chlorine content. Based on the ISE ion-selective electrode method, it can quickly test the solution chlorine content in the area within 120 seconds, and the test accuracy reaches 0.0001%.

[0050] The total power of the water pumps in the water supply and drainage system unit is ≥800W. Each side of the unit is equipped with 2 inlet / outlet ports, and the maximum flow rate of a single inlet / outlet port is ≥1.5L / s.

[0051] The protective netting is 0.1m away from the side electrode plate, and the mesh size is <0.15mm.

[0052] The axial water flow velocity of the sea sand dechlorination device is 0.1-0.2 m / s, the length of a single sea sand agitator blade is 0.5 m, and the agitator blade speed is set to five levels: 40 r / min, 60 r / min, 80 r / min, and 100 r / min.

[0053] The power-on and power-off module has two power-on time settings: 10s and 15s. The power-off duration can be adjusted at four time intervals: 5s, 10s, 15s, and 20s, based on the chlorine removal requirements of the sea sand and the feedback data from the chlorine content testing system.

[0054] This embodiment of the sea sand dechlorination device based on replaceable high-performance cement-based electrode plates includes a sea sand dechlorination channel body 2, a cement-based electrode plate 1, and a multi-functional integrated system. The sea sand dechlorination channel body 2 is made of reinforced ABS resin with an organosilicon-modified resin coating. The replaceable electrode plate is made of a graphene-modified high-performance cement-based material. The entire assembly can be completed quickly on-site. The specific implementation process is as follows:

[0055] 1. Production of replaceable conductive high-performance cement-based electrode plates

[0056] like Figure 1 As shown, based on the general slot size of the channel, a cement-based electrode plate 1 is made using a specific mold (taking a length of 1m, a height of 0.5m, and a thickness of 0.1m as an example). The gap between the cement-based electrode plate and the slotted assembly of the channel side wall is controlled at ±1.0mm / m, the dimensional tolerance is controlled at ≤±1mm / m, and the flatness is controlled at ≤0.5mm / m.

[0057] Prepare the following materials by weight: 450 parts of 525 cement, 1300-1400 parts of 20-70 mesh fine aggregate, 2-6 parts of graphene, 1-2 parts of ultra-fine steel fiber, 6-9 parts of ultra-high molecular weight polyethylene (UHMWPE) fiber, and 170-190 parts of water. Mix these materials and pour the mixture into a specific mold within the pre-designed electrode connection area. After molding, install a waterproof power interface on the cement-based electrode plate and steam-cur it at 60℃ and 95% humidity for 48 hours. After demolding, continue standard curing for 28 days. Use a laser scanner to check if the dimensional tolerances and flatness of the precast components meet the requirements. Typically, its 28-day compressive strength is ≥60MPa, and its resistivity is approximately 182Ω / cm.

[0058] 2. Production of the main body of the sea sand dechlorination channel

[0059] The channel unit made of ABS resin is mainly realized through thermoplastic processing technology: first, the resin particles are dried in an environment of 80℃ for 2-4 hours, then melted and plasticized in a barrel at a temperature of 190-230℃ and injected into an existing mold under high pressure, and then demolded after holding pressure and cooling at a temperature of 40-80℃ for 24 hours.

[0060] After demolding, the silicone-modified resin coating is applied to strengthen the channel unit: first spray with Sa2.5 grade clean sand, then coat with silicone-modified acrylate with a thickness of 20-50μm. After curing the coated channel unit at 120℃ for 30 minutes, the subsequent assembly work can be carried out.

[0061] 3. On-site assembly of the sea sand dechlorination channel

[0062] like Figure 1 The main body 2 of the sea sand dechlorination channel shown is fixed with electrode plates by electrode plate slots 6. Then, the front splicing interface 8 of the channel is connected to the rear splicing interface 9 of the channel of other adjacent units. Then, the sea sand stirring blades 11 are added. Finally, the splicing reinforced steel pipes 10 are installed to realize the overall connection of the channel. After the assembly is completed, its lower half water tightness should be strictly checked to see if it reaches the IPX7 level.

[0063] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this invention should not be considered limited to the specific forms described in these embodiments; rather, it extends to equivalent technical means conceived by those skilled in the art based on the inventive concept.

Claims

1. A sea sand chlorine removing device based on replaceable high-performance cement-based electrode plate, characterized in that, The device comprises a cement-based electrode plate, a sea sand chlorine removal channel body and a sea sand stirring blade, the inner wall of the two sides of the sea sand chlorine removal channel body is provided with an electrode plate clamping groove, the cement-based electrode plate is installed in the electrode plate clamping groove, one side of the sea sand chlorine removal channel body is provided with a water inlet, and the other side is provided with a water outlet, and the sea sand stirring blade is located in the channel of the sea sand chlorine removal channel body; the cement-based electrode plate is made of an aggregate modified cement-based material coated with synthetic nanometer graphene.

2. The sea sand de-chlorination device based on replaceable high performance cement-based electrode plate according to claim 1, characterized in that, The aggregate modified cement-based material is composed of the following components in mass fraction: 450 parts of 525 cement, 1300-1400 parts of 20-70 mesh fine aggregate, 2-6 parts of graphene, 1-2 parts of ultra-fine steel fiber, 6-9 parts of ultra-high molecular weight polyethylene fiber and 170-190 parts of water.

3. The sea sand de-chlorination device based on replaceable high performance cement-based electrode plate according to claim 2, characterized in that, In the 20-70 mesh fine aggregate, the proportion of 20-40 mesh is 25%-35%, and the proportion of 40-70 mesh is 65%-75%.

4. The sea sand de-chlorination device based on the replaceable high performance cement-based electrode plate according to any one of claims 1 to 3, characterized in that, The cement is 52.5 Portland cement, 28d compressive strength ≥ 52.5 MPa, specific surface area ≥ 300 m 2 / kg; the fine aggregate is 20-70 mesh quartz sand, silica content ≥ 98%; the graphene is high-conductivity graphene, specific surface area 50-60 m 2 / g, four-probe test film conductivity ≥ 200 S / cm.

5. The sea sand de-chlorination device based on replaceable high performance cement-based electrode plate according to any one of claims 1 to 3, characterized in that, The ultra-fine steel fiber has a single filament diameter of 20 μm, a length of 6-12 mm and a tensile strength greater than 2600 MPa; the ultra-high molecular weight polyethylene fiber has a single filament diameter of 14 μm, a length of 6-12 mm, an elastic modulus of ≥120 GPa and a tensile strength greater than 3.0 GPa.

6. The sea sand chlorine removing device based on the replaceable high-performance cement-based electrode plate according to claim 2 or 3, characterized in that, The fine aggregate is attached to the nanometer graphene layer as a growth site by phenolic resin, and part of the defects in the aggregate are filled; the ultra-fine steel fiber is surface-oxidized at 30°C for 30 min to improve the bonding capacity of the fiber and the cement paste.

7. The sea sand chlorine removing device based on the replaceable high-performance cement-based electrode plate according to claim 2 or 3, characterized in that, The cement-based electrode plate has a 28d compressive strength of ≥60 MPa, a 28d resistivity of less than 0.5 Ωm, a wear resistance of B grade, a single block length of 1-1.5 m, a width of 0.5-1.5 m and a thickness of 0.1-0.5 m.

8. The sea sand de-chlorination device based on replaceable high performance cement-based electrode plate according to any one of claims 1 to 3, characterized in that, The sea sand chlorine removal device further comprises a protective net, and the inner side of the electrode plate clamping groove is provided with the protective net.

9. The sea sand de-chlorination device based on replaceable high performance cement-based electrode plate according to any one of claims 1 to 3, characterized in that, The front part of the sea sand chlorine removal channel body is provided with a channel front splicing port, and the rear part is provided with a channel rear splicing port, and the front and rear sea sand chlorine removal devices are spliced to form a sea sand chlorine removal channel.

10. The sea sand de-chlorination device based on replaceable high performance cement-based electrode plate according to any one of claims 1 to 3, characterized in that, The sea sand chlorine removal device further comprises a water supply and drainage device and a multifunctional integrated control system, the water supply and drainage device is composed of a pipeline at the channel water inlet / outlet and an external water pump; the multifunctional integrated control system comprises a power-on and power-off module, a water supply and drainage module and a channel liquid chlorine content determination module, and is locally / remote unified remotely controlled through a central control panel, the electrode plate clamping groove is provided with a reserved power supply port, the reserved power supply port is electrically connected with the cement-based electrode plate, and the reserved power supply port is connected with the power-on and power-off module.

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