Method for preparing telegraph pole from high-water-content solid waste

Abstract

The invention discloses a method for preparing a telegraph pole by using high-water-content solid waste, which comprises the following steps: replacing a reinforcement cage net in a traditional telegraph pole with a composite cage net constructed by fiber reinforced plastic-high-strength fiber gridding cloth, and scientifically proportioning various high-water-content solid wastes according to the following mass proportion to replace cement as a cementing material: 165-205 parts of marine sludge, 80-130 parts of magnetic separation red mud, 20-30 parts of mineral powder, 20-30 parts of mineral powder, 20-30 parts of mineral powder, 20-30 parts of mineral powder and 20-30 parts of mineral powder. The cement grinding aid comprises the following components in parts by weight: 220-290 parts of carbide slag, 5-15 parts of nano C-S-H gel seed crystal, 10-30 parts of zeolite powder, 2-5 parts of sodium hexametaphosphate and 8-15 parts of potassium permanganate. According to the production method, the telegraph poles with various specifications and excellent mechanical performance can be produced through the processes of rib binding, pouring, centrifuging, autoclaving and the like. The preparation method provided by the invention not only completes resource utilization under combination of various solid wastes, but also provides a new mode for deep utilization of high-water-content solid wastes.

Description

Technical Field

[0001] The invention relates to the technical field of solid waste resource utilization, and in particular to a method for preparing electric poles from high-water-content solid waste. Background Art

[0002] As the domestic industrial sectors develop and infrastructure enters new areas, various new types of solid waste emerge in an endless stream, posing a serious threat to the environment. Among them, the problems caused by high-water solid waste are particularly prominent. On the one hand, they not only show all the harmful forms of dry-based solid waste, but also the highly polluted waste liquid components put forward higher requirements for storage sites. Therefore, it is particularly urgent to develop a resource treatment method suitable for high-water solid waste.

[0003] Marine silt is the main form of solid waste generated during port dredging and coastal construction. Its huge volume, high salinity and low activity make it difficult to be used directly as a concrete admixture like other ground materials.

[0004] Calcium carbide slag is the main solid waste generated after the industrial preparation of acetylene. It has a high dry basis calcium content and has great potential for resource utilization. However, its high water content leads to high energy consumption in processing, which greatly weakens its economic value.

[0005] Magnetic separation red mud is the tailings after red mud is further treated by magnetic separation process, in which the high value-added cost has been basically completely extracted, and the residual components have high water content and high alkalinity. Compared with ordinary red mud, it has lower utilization value and greater harm. It can be seen that the three types of high-water content solid wastes all face problems such as high dehydration cost, great environmental harm and low utilization value. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preparing electric poles from high-water-content solid waste, and at the same time utilize carbide slag, seabed silt and magnetic separation red mud to achieve coordinated disposal and reuse of multiple solid wastes.

[0007] The present invention proposes to construct a balanced CaO-Al2O3-SiO2 ternary equilibrium state based on the original marine silt-magnetic separation red mud-carbide slag, and promote its complete release of activity through pressure steaming. At the same time, using the form of electric poles as carriers, the dehydration cost is greatly reduced. This provides a new method for low-cost treatment of high-water-content solid waste.

[0008] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0009] A method for preparing electric poles from high-water-content solid waste, comprising the following steps:

[0010] Step 1: Take the fiber reinforced plastic rib and put it into the annular fixture, impregnate the high-strength fiber mesh cloth with a layer of thermosetting phenolic resin, firstly wrap the high-strength fiber mesh cloth impregnated with the thermosetting phenolic resin on the inner side of the fiber reinforced plastic rib, and then wrap the high-strength fiber mesh cloth impregnated with the thermosetting phenolic resin on the outer side of the fiber reinforced plastic rib to obtain a reinforced rib cage net;

[0011] Step 2: After curing the reinforcing rib cage net obtained in step 1, a cured reinforcing rib cage net is obtained, and the cured reinforcing rib cage net is placed in a utility pole mold;

[0012] Step 3: Weigh the following raw materials by weight:

[0013] 165-205 parts of marine sludge, 80-130 parts of magnetically separated red mud, 220-290 parts of carbide slag, 5-15 parts of nano CSH gel seeds, 10-30 parts of zeolite powder, 2-5 parts of sodium hexametaphosphate, and 8-15 parts of potassium permanganate;

[0014] After the above raw materials are stirred until uniform, they are evenly distributed into the electric pole mold in step 2;

[0015] Step 4: Move the electric pole mold after the treatment in step 3 as a whole to a centrifuge, demould it after centrifugal treatment, and prepare the electric pole prepared from the high-water content solid waste.

[0016] Furthermore, the fiber reinforced plastic ribs in step 1 are one of glass fiber reinforced plastic ribs, carbon fiber reinforced plastic ribs or aramid fiber reinforced plastic ribs;

[0017] The high-strength fiber mesh cloth in step 1 is one of aramid fiber mesh cloth, glass fiber mesh cloth, polypropylene fiber mesh cloth or carbon fiber mesh cloth.

[0018] Furthermore, in step 1, the high-strength fiber mesh cloth is impregnated with a layer of thermosetting phenolic resin, and the thickness of the impregnated thermosetting phenolic resin is 2-3 mm.

[0019] Furthermore, the curing conditions in step 2 are: curing at a curing temperature of 150-180° C. for 1-3 hours to obtain a cured reinforcing rib cage mesh;

[0020] The conditions of the centrifugal treatment in step 4 are: centrifugation at a speed of 300-700 r / min for 3-10 min, autoclave curing at 0.6-1.0 MPa and 150-200° C. for 4-8 h, and then demolding.

[0021] Furthermore, the marine sludge in step 3 is original marine sludge with a water content of 40-60%.

[0022] Furthermore, the magnetically separated red mud in step 3 is original magnetically separated red mud, with a moisture content of 50-80% and a dry basis F2O3 content of less than 2%.

[0023] Furthermore, the carbide slag in step 3 is original carbide slag, with a moisture content of 45-70% and a dry basis CaO greater than 90%.

[0024] Furthermore, the nano-CSH gel seed crystals, sodium hexametaphosphate and potassium permanganate in step 3 are all industrial-grade products with a purity greater than 99%.

[0025] Furthermore, the zeolite powder in step 3 is a powder obtained by grinding natural zeolite rock, and has a specific surface area greater than 600 m 2 / g.

[0026] The present invention also discloses a utility pole, which is prepared according to the method for preparing a utility pole from high-water-content solid waste. The utility pole produced by the present invention has excellent bending and compression resistance and good durability.

[0027] In the present invention, the fiber reinforced plastic ribs taken and placed in the annular fixture in step 1 may be 8 to 16.

[0028] In the present invention, high-strength fiber mesh cloth impregnated with thermosetting phenolic resin is wound on the fiber-reinforced plastic ribs in two layers, one layer on the inner side and one layer on the outer side.

[0029] In the present invention, the distribution of materials in step 3 to the electric pole mold in step 2 is achieved by a material distribution machine.

[0030] In the present invention, the various components for preparing the utility poles complement each other and are indispensable, forming a mutually coordinated system, the mechanism of which is as follows:

[0031] Using marine silt as the source of silica and aluminum, carbide slag as the source of calcium, and magnetically separated red mud as the activating component, a set of practical alkali-activated cementitious material system was constructed through scientifically designed proportions.

[0032] At the same time, in order to solve the defect of low activity of the above materials, the pressure steam curing process and nano CSH gel seeds are introduced to promote the hydration reaction and give the products high-quality mechanical properties.

[0033] Since the powder particles in the selected solid waste are extremely fine and prone to agglomeration, an appropriate amount of sodium hexametaphosphate is introduced to assist in the dispersion of the powder particles.

[0034] At the same time, the moisture content of the original high-water solid waste fluctuates greatly. Zeolite powder is introduced in the present invention to absorb excess moisture and adjust the slurry consistency. The above means ensure that the slurry workability meets the production process requirements of the electric pole.

[0035] At the same time, the nano-CSH gel seeds act as crystal nuclei in the reaction system, reducing the nucleation barrier and accelerating the hydration reaction.

[0036] It should be noted that marine silt contains high chloride components and certain organic matter, which will have a great impact on the hydration reaction and product durability. The present invention uses potassium permanganate to oxidize and remove organic components, replaces the traditional steel skeleton with a fiber-reinforced plastic bar-high-strength fiber mesh composite skeleton, eliminates the risk of steel corrosion, and at the same time, the composite skeleton is light in weight and has better mechanical properties than steel bars, giving the product stronger mechanical properties.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The present invention replaces the steel cage net in the traditional electric pole with a composite cage net constructed of fiber reinforced plastic-high-strength fiber mesh cloth, and uses a variety of high-water-content solid wastes in the following mass ratios to replace cement as a cementitious material: After processes such as reinforcing bars-casting-centrifugal-pressure steaming, various specifications of electric poles with excellent mechanical properties can be produced. The preparation method of the present invention not only completes the resource utilization of multiple solid wastes, but also provides a new model for the deep utilization of high-water-content solid wastes.

[0039] 2. The main raw materials used in the present invention are marine silt, magnetically separated red mud and carbide slag, which realizes the "waste treatment with waste" and the coordinated disposal of multiple solid wastes, with significant social and environmental benefits.

[0040] 3. The present invention utilizes the centrifugal process in the preparation process of electric poles to achieve the dehydration of high-water-content solid waste, so that no additional mixing water is required in the configuration of cementitious materials, and the hardened body is in a low-water content state, thereby achieving the purpose of saving water resources and saving waste disposal costs.

[0041] 4. The method for preparing electric poles from high-water-content solid waste of the present invention produces electric poles with excellent bending and compression resistance and good durability.

[0042] 5. The method for preparing electric poles from high-water-content solid waste of the present invention can be directly applied to existing mature industrial production processes, with low startup costs and high economic value. DETAILED DESCRIPTION

[0043] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0044] In the embodiments of the present invention, the nano CSH gel seeds, sodium hexametaphosphate and potassium permanganate used are all industrial grade products with a purity greater than 99%. The marine sludge is original marine sludge, the red mud is original magnetically separated red mud, and the dry basis F2O3 content is less than 2%; the carbide slag is original carbide slag, and the dry basis CaO content is greater than 90%.

[0045] Example 1

[0046] Step 1: Take 8 carbon fiber reinforced plastic ribs and put them into a ring fixture, impregnate the carbon fiber mesh cloth with a layer of thermosetting phenolic resin, firstly wrap a layer of the carbon fiber mesh cloth impregnated with thermosetting phenolic resin on the inside of the carbon fiber reinforced plastic rib, and then wrap a layer of the carbon fiber mesh cloth impregnated with thermosetting phenolic resin on the outside of the carbon fiber reinforced plastic rib to obtain a reinforcement rib cage;

[0047] Step 2: Curing the reinforced rib cage net obtained in step 1 at a curing temperature of 150° C. for 2 hours, and after curing, obtaining a cured reinforced rib cage net, and placing it in a mold of an equal-diameter electric pole (specification: Φ400mm×9m);

[0048] Step 3: Then take 237 parts of carbide slag (52% moisture content), 190 parts of marine silt (49% moisture content), 107 parts of magnetically separated red mud (56% moisture content), 14 parts of nano CSH gel seeds, and zeolite powder (specific surface area of ​​730m 2 / g) 13 parts, sodium hexametaphosphate 2.9 parts, potassium permanganate 11 parts, after stirring evenly, use a distribution machine to evenly distribute the materials to the electric pole mold.

[0049] Step 4: Move the electric pole mold after the treatment in step 3 to a centrifuge as a whole, and demould it after centrifugal treatment. The centrifugal treatment conditions are centrifugation at a speed of 500r / min for 5 minutes, and then autoclave curing in an environment of 0.8MPa and 180℃ for 6 hours before demoulding to obtain an electric pole.

[0050] At the same time, another part of the uniformly stirred gelling material is put into a cylindrical mold, and after the same centrifugal and pressure steaming process as the above-mentioned electric pole production, a 100mm×100mm×100mm test block is cut out.

[0051] The cracking bending moment of the utility pole prepared in Example 1 was tested (the test standard is GB 4623-2014).

[0052] The prepared test blocks were subjected to compressive strength tests (test standard is GB / T 50081-2019). The test showed that the cracking moment was 303.1 kN·m and the concrete compressive strength was 113.4 MPa.

[0053] Example 2

[0054] Step 1: Take 12 glass fiber reinforced plastic bars and put them into a ring fixture, impregnate the glass fiber mesh cloth with a layer of thermosetting phenolic resin, firstly wrap the glass fiber mesh cloth impregnated with thermosetting phenolic resin on the inner side of the glass fiber reinforced plastic bar, and then wrap the glass fiber mesh cloth impregnated with thermosetting phenolic resin on the outer side of the glass fiber reinforced plastic bar to obtain a reinforced bar cage net;

[0055] Step 2: Curing the reinforced rib cage net obtained in step 1 at a curing temperature of 180° C. for 1 h. After the curing treatment, a cured reinforced rib cage net is obtained, and the cured reinforced rib cage net is placed in a mold of an equal-diameter electric pole (specification: Φ400mm×9m);

[0056] Step 3: Then take 290 parts of carbide slag (45% moisture content), 205 parts of marine silt (40% moisture content), 80 parts of magnetically separated red mud (80% moisture content), 15 parts of nano CSH gel seed crystals, and zeolite powder (specific surface area of ​​810m 2 / g) 30 parts, sodium hexametaphosphate 5 parts, potassium permanganate 15 parts, stir well and evenly distribute them to the electric pole mold through a distribution machine.

[0057] Step 4: Move the electric pole mold after the treatment in step 3 as a whole to a centrifuge, demould it after centrifugal treatment, the centrifugal treatment condition is centrifugal speed of 300r / min for 10min, and then autoclave curing in an environment of 1.0MPa and 150℃ for 8h before demoulding to obtain the electric pole.

[0058] At the same time, another part of the uniformly stirred gelling material is put into a cylindrical mold, and after the same centrifugal and pressure steaming process as the above-mentioned electric pole production, a 100mm×100mm×100mm test block is cut out.

[0059] The cracking bending moment of the utility pole prepared in Example 2 was tested (test standard is GB 4623-2014).

[0060] The prepared test blocks were subjected to compressive strength tests (test standard is GB / T 50081-2019). The test showed that the cracking moment was 378.4 kN·m and the concrete compressive strength was 104.9 MPa.

[0061] Example 3

[0062] Step 1: Take 16 aramid fiber reinforced plastic bars and put them into a ring fixture, impregnate the aramid fiber mesh cloth with a layer of thermosetting phenolic resin, firstly wrap the aramid fiber mesh cloth impregnated with thermosetting phenolic resin on the inner side of the aramid fiber reinforced plastic bar, and then wrap the aramid fiber mesh cloth impregnated with thermosetting phenolic resin on the outer side of the aramid fiber reinforced plastic bar to obtain a reinforced bar cage;

[0063] Step 2: Curing the reinforced rib cage net obtained in step 1 at a curing temperature of 160° C. for 3 hours, and after curing, obtaining a cured reinforced rib cage net, placing it in a mold of an equal-diameter electric pole (specification: Φ400mm×12m);

[0064] Step 3: Then take 220 parts of carbide slag (70% moisture content), 165 parts of marine silt (60% moisture content), 130 parts of magnetically separated red mud (50% moisture content), 5 parts of nano CSH gel seed crystals, and zeolite powder (specific surface area of ​​780m 2 / g) 10 parts, sodium hexametaphosphate 2 parts, potassium permanganate 8 parts, stir well and evenly distribute them to the electric pole mold through a distribution machine.

[0065] Step 4: Move the electric pole mold after the treatment in step 3 as a whole to a centrifuge, demould it after centrifugal treatment, the centrifugal treatment condition is centrifugal speed of 700r / min for 3min, and then autoclave curing for 4h in 0.6MPa, 200℃ environment before demoulding to obtain the electric pole.

[0066] At the same time, another part of the uniformly stirred gelling material is put into a cylindrical mold, and after the same centrifugal and pressure steaming process as the above-mentioned electric pole production, a 100mm×100mm×100mm test block is cut out.

[0067] The cracking bending moment of the utility pole prepared in this embodiment was tested (the test standard is GB 4623-2014), and the prepared test block was subjected to a compressive strength test (the test standard is GB / T 50081-2019). The test showed that the cracking bending moment was 240.4 kN·m, and the concrete compressive strength was 118.2 MPa.

[0068] It can be seen from the above embodiments that the method for preparing electric poles with high water content solid waste of the present invention is suitable for preparing various concrete electric poles of different specifications, and the cracking bending moments of the prepared electric poles meet or even exceed the relevant standards. The cementitious system constructed with marine sludge-magnetic red mud-carbide slag as the main raw materials, and additionally mixed with some other admixtures and mixed materials, after centrifugation and autoclave treatment, the obtained concrete compressive strength is greater than 100MPa, ensuring the excellent mechanical properties of the product.

[0069] The present invention is described exemplarily above in conjunction with the embodiments. It is obvious that the implementation of the present invention is not limited to the above-mentioned methods. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for preparing electric poles from high-water-content solid waste, characterized in that: The following steps are involved: Step 1: Take the fiber reinforced plastic rib and put it into the annular fixture, impregnate the high-strength fiber mesh cloth with a layer of thermosetting phenolic resin, firstly wrap the high-strength fiber mesh cloth impregnated with the thermosetting phenolic resin on the inner side of the fiber reinforced plastic rib, and then wrap the high-strength fiber mesh cloth impregnated with the thermosetting phenolic resin on the outer side of the fiber reinforced plastic rib to obtain a reinforced rib cage net; Step 2: After curing the reinforcement cage net obtained in step 1, a cured reinforcement cage net is obtained, and the cured reinforcement cage net is placed in a pole mold; Step 3: Weigh the following raw materials by weight: 165-205 parts of marine sludge, 80-130 parts of magnetically separated red mud, 220-290 parts of carbide slag, 5-15 parts of nano CSH gel seeds, 10-30 parts of zeolite powder, 2-5 parts of sodium hexametaphosphate, and 8-15 parts of potassium permanganate; After the above raw materials are stirred until uniform, they are evenly distributed into the electric pole mold in step 2; Step 4: Move the electric pole mold processed in step 3 as a whole to a centrifuge, demould it after centrifugal treatment, and prepare the electric pole prepared from the high-water content solid waste.

2. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: The fiber reinforced plastic ribs in step 1 are glass fiber reinforced plastic ribs, carbon fiber reinforced plastic ribs or aramid fiber reinforced plastic ribs; The high-strength fiber mesh cloth in step 1 is one of aramid fiber mesh cloth, glass fiber mesh cloth, polypropylene fiber mesh cloth or carbon fiber mesh cloth.

3. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: In step 1, the high-strength fiber mesh cloth is impregnated with a layer of thermosetting phenolic resin, and the thickness of the impregnated thermosetting phenolic resin is 2-3 mm.

4. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: The curing conditions in step 2 are: curing at a curing temperature of 150-180° C. for 1-3 hours to obtain a cured reinforcement cage mesh; The conditions of the centrifugal treatment in step 4 are: centrifugation at a speed of 300-700 r / min for 3-10 min, and autoclaving and curing at 0.6-1.0 MPa and 150-200° C. for 4-8 h before demoulding.

5. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: The marine sludge in step 3 is original marine sludge with a water content of 40-60%.

6. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: The magnetically separated red mud in step 3 is original magnetically separated red mud with a moisture content of 50-80% and a dry-basis F2O3 content of less than 2%.

7. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: The carbide slag in step 3 is original carbide slag with a moisture content of 45-70% and a dry basis CaO content of more than 90%.

8. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: The nano CSH gel seed crystals, sodium hexametaphosphate and potassium permanganate described in step 3 are all industrial grade products with a purity greater than 99%.

9. The method for preparing electric poles from high-water-content solid waste according to claim 1, characterized in that: The zeolite powder in step 3 is obtained by grinding natural zeolite rock into powder, and the specific surface area of ​​the zeolite powder is greater than 600m 2 / g.

10. A utility pole, characterized in that: The utility pole is prepared according to the method for preparing utility poles from high-water-content solid waste as described in any one of claims 1 to 9.