Desert sand base artificial earthwork lattice sand barrier and preparation and use method thereof

Abstract

The invention discloses a desert sand-based artificial earthwork lattice sand barrier and a preparation and use method thereof, the artificial earthwork lattice sand barrier comprises the following components in percentage by mass: 93-97% of a coal-sand-ash mixture, 1-10% of an activating agent and 5-15% of externally doped water, and the artificial earthwork lattice sand barrier is prepared by compacting and molding, and the coal-sand-ash mixture accounts for 93-97%, the activating agent accounts for 1-10% and the externally doped water accounts for 5-15%. The desert sand base artificial earthwork grid is horizontally laid in the desert and a water and soil loss area, desert sand stabilization can be achieved, and surface layer floating sand and surface layer sandy soil loss in the water and soil loss area are prevented. Typical coal-fired solid wastes such as the coal ash and the coal slag are used as raw materials for preparing the desert sand-based artificial earthwork grid, collaborative resource utilization of the desert sand, the coal ash and the coal slag is achieved, resource utilization of a large amount of industrial solid wastes is combined with desertification prevention and control engineering, environmental pollution is reduced, and the desertification control cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of desert sand prevention and fixation and solid waste resource utilization, and in particular relates to a desert sand-based artificial earth grid sand barrier and a preparation and use method thereof. Background Art

[0002] The desertified land area in my country is 2.5737 million square kilometers, and the direct economic losses caused each year exceed 64 billion yuan. The western desert region has rich wind and solar energy resources and is the key development area for wind power and photovoltaic power in my country in the future. However, due to the flat and vast desert terrain, and the fact that most of the deserts are located on the downwind side of the wind outlet and the dust source area or the transmission path area, without sand control and sand fixation measures, it is very easy for solar panels to overturn and pile foundations to erode in extreme windy environments. This has limited the development of the "photovoltaic + ecological" "sand industry" model to a certain extent. At present, setting up sand barriers at the windward outlet of photovoltaic bases is one of the mainstream means of sand control and sand fixation, including sand willow, grass grid sand barriers, stone grid sand barriers, sand barrier fences (nets), etc. However, due to the harsh natural conditions in desert areas and the strong harm of wind and sand, firewood and grass sand barriers are easily eroded and decomposed, and lose their sand fixation function prematurely; sand barriers such as clay / sand and gravel consume a lot of natural resources and need to be transported over long distances, and the comprehensive cost is relatively high; sand barrier fences are mostly made of organic polymers such as HDPE, which are costly and have poor long-term durability.

[0003] In addition, in recent years, the average annual production of fly ash, a major coal-fired solid waste in my country, is nearly 827 million tons. The current level of resource utilization of fly ash and other major solid wastes is relatively low, with historical stockpiles exceeding 3 billion tons, and the occupation of land has caused great safety hazards to the ecological environment. Recycling fly ash with high added value, turning waste into treasure and harm into benefit, has become an important technical and economic policy in my country's economic construction, an important means to solve the contradiction between environmental pollution and resource shortage in my country's power production, and one of the tasks facing power production.

[0004] Based on my country's demand for desert wasteland management and the current status of fly ash treatment and disposal of typical coal-fired solid waste, we use typical coal-fired solid waste such as fly ash and coal slag from coal-fired power plants to develop specific active stimulating materials to consolidate desert sand at room temperature, and develop highly erosion-resistant, low-cost, and low-environmental-risk "desert sand-based artificial earth grid sand barrier" and its preparation method, which has great economic, environmental and social benefits. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing artificial earth grid sand barriers at room temperature using desert sand and typical coal-fired solid waste such as fly ash and coal slag as main raw materials, so as to achieve the coordinated resource utilization of desert sand, fly ash and coal slag, and combine the resource utilization of bulk industrial solid waste with sand prevention and control projects to reduce environmental pollution, reduce desert control costs, and provide technical support for subsequent scientific prevention and control of "desertification".

[0006] To achieve the above objectives, the technical solution of the present invention is:

[0007] A desert sand-based artificial earth grid sand barrier comprises a coal-sand-ash mixture and an activator, based on the mass percentage of each component. The coal-sand-ash mixture accounts for 93-97%, the activator accounts for 1-10%, and the external water ratio is 5-15%.

[0008] Furthermore, the coal-sand-ash mixture is formed by mixing coal slag, desert sand and fly ash in a mass ratio, and the mass ratio of each component is coal slag: desert sand: fly ash = 1:3~10:2~8.

[0009] Furthermore, the coal slag and fly ash are solid waste raw materials generated by burning coal.

[0010] Furthermore, the activator is made of the following raw materials in parts by weight: 70-85 parts by weight of mineral powder, 10-25 parts by weight of alkaline activator, and 1-5 parts by weight of surfactant.

[0011] Furthermore, the moisture content of the mineral powder is lower than 4%.

[0012] Furthermore, the alkaline activator includes one or more of Na2C03, NaOH, Na2S04, KAl(S04)2.6H20, K2N02, NaF, K2C03 in combination or with cement clinker.

[0013] Furthermore, the surfactant is a composite of one or more of triethanolamine, sulfite pulp waste liquor, sodium acetate, sodium lignosulfonate, calcium lignosulfonate or a composite of the surfactant and urea.

[0014] A method for preparing a desert sand-based artificial earth grid sand barrier, characterized in that it comprises the following steps:

[0015] S1: The coal slag is crushed by a crusher, the crushed coal slag is screened by a square hole sieve, and the part above the sieve is sealed;

[0016] S2: taking out the crushed coal slag sealed in step S1, mixing the coal slag with desert sand and fly ash in a mixer, adding water and stirring again to obtain a mixed material;

[0017] S3: filling the mixed material obtained in step S2 into a mold, and compacting and molding it using a press to obtain a compacted desert sand-based artificial earth grid;

[0018] S4: demolding the desert sand-based artificial earth grid compacted in step S3, encapsulating it with a waterproof film, and placing it in a curing box for curing. After the curing time reaches a specified age, the desert sand-based artificial earth grid is taken out, and the preparation of the desert sand-based artificial earth grid is completed.

[0019] A method for using a desert sand-based artificial earth grid sand barrier is characterized by comprising: horizontally laying the desert sand-based artificial earth grid in a desert or a soil erosion area.

[0020] Furthermore, the desert sand-based artificial soil grid is laid in a grid of 0.5m×0.5m-5×5m.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention not only solves the problem of handling coal-fired solid waste, but also solves the problem of preventing and fixing desert sand. The coal mine resources in Northwest my country are rich in reserves. Coal-fired power plants generate a large amount of coal-fired solid waste (fly ash, coal slag, etc.) during continuous operation. The disposal and resource utilization of coal-fired solid waste are also urgent problems to be solved at present. The present invention uses coal-fired solid waste as raw materials for preparing desert sand-based artificial earth grids, realizing the reuse of coal-fired solid waste; at the same time, the desertification area in Northwest China is vast, and preventing and controlling sand and preventing the further spread of deserts are also problems that continue to be solved at present. This desert sand-based artificial earth grid sand barrier and its preparation method utilize desert sand locally, and combine the solid waste of coal-fired power plants in the surrounding areas of the desert to prepare a "desert sand-based artificial earth grid sand barrier", which is used as a sand-fixing material (sand barrier) for the construction of photovoltaic bases in desert areas, which can prevent wind and sand from eroding photovoltaics, block the spread of desertification areas, and restore vegetation in desertified areas. At the same time, it can also realize the resource utilization of coal slag and fly ash.

[0023] 2. The main raw materials of the desert sand-based artificial earth grid sand barrier of the present invention are idle or untreated solid wastes, including the raw materials for preparing the activator, which are mainly slag waste to be treated. In addition, the preparation method of the desert sand-based artificial earth grid is also very efficient, fast and simple. It can be formed by simple stirring, mixing, filling and compacting. Therefore, the cost of the desert sand-based artificial earth grid sand barrier is very low. At the same time, while ensuring the requirements of various technical parameters such as product compressive strength and mass loss rate, the amount of activator and water infiltration is reduced, further reducing the cost.

[0024] 3. The compressive strength of this desert sand-based artificial earth grid sand barrier can reach 1.1-3.6MPa after 7 days of curing, and 1.8-6.1MPa after 28 days. The material compressive strength performance is stable, the mass loss rate in 28 days is about 2%, and the dry density is 1.7g / cm 3 . It can meet the performance requirements of sand barriers in desert areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Desert sand-based artificial earth grid sand barrier indoor experimental product. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the invention clearer, the present invention is further described below with reference to the accompanying drawings.

[0027] A desert sand-based artificial earth grid sand barrier, characterized in that it is made of the following raw materials in parts by weight: 93-97% of coal-sand-ash mixture (coal slag: desert sand: fly ash = 1:3-10:2-8), 1-10% of activator, and 5-15% of water.

[0028] The coal-sand-ash mixture is prepared by mixing and stirring coal-furnace slag, desert sand and fly ash according to the designed ratio and mass ratio. The water content of the three materials is negligible. The coal-furnace slag must be crushed by a jaw crusher, and the 0.15 mm sieve-surface crushed coal furnace is used as the mixing raw material. Desert sand and fly ash are directly taken from raw materials for mixing. Fly ash and coal-furnace slag are made of coal-fired solid waste raw materials produced by Jingneng Thermal Power Co., Ltd. in Kangbashi District, Ordos City, Inner Mongolia Autonomous Region, and desert sand is taken from the Kubuqi Desert in Ordos.

[0029] The activator is prepared from the following raw materials in parts by weight: 70-85 parts of mineral powder, 10-25 parts of alkaline activator, and 1-5 parts of surfactant. The moisture content of the mineral powder should be less than 4%, and the alkaline activator is prepared by compounding one or more of Na2C03, NaOH, Na2S04, KAl(S04)2.6H20, K2N02, NaF, and K2C03 or compounding with cement clinker. The surfactant is a compound of one or more of triethanolamine, sulfite pulp waste liquid, sodium acetate, sodium wood sulfonate, and calcium wood sulfonate or ... sodium wood sulfonate, and calcium wood sulfonate with urea.

[0030] The invention also provides a method for preparing a desert sand-based artificial earth grid sand barrier.

[0031] (1) Take an appropriate amount of coal slag and crush it with a jaw crusher. Pass the crushed coal slag through a 0.15 mm square hole sieve, and seal the part above the sieve for subsequent experiments.

[0032] (2) Take a set weight portion of crushed coal slag, desert sand, and fly ash in a mixer and stir for 3 minutes, then add a specific weight portion of water and stir for another minute.

[0033] (3) Fill the mold and compact it using a press with the pressure set to 160 kN.

[0034] (4) After demoulding, seal with a waterproof film and place in a curing box for standard curing at a temperature of 20°C and a humidity of 90% RH. Figure 1 It is an indoor experimental product of desert sand-based artificial earth grid sand barrier.

[0035] The invention also provides a method for using a desert sand-based artificial earth grid sand barrier, which is used for stabilizing surface floating sand and surface sandy soil in deserts and soil erosion areas.

[0036] As a preferred solution, the desert sand-based artificial soil grid is used in the desert and soil erosion areas by horizontal paving, and the preferred paving size is that the desert sand-based artificial soil grid is paved into a grid of 0.5m×0.5m-5m×5m. If the paving grid area is too small and the paving density is too high, the cost will increase on the one hand, and the increasing trend of the sand fixation effect will gradually slow down as the grid area is less than 0.5m×0.5m.

[0037] As a preferred solution, the relative slope of the paving in deserts and soil erosion areas is no more than 45°.

[0038] As a preferred solution, the soil particle size D of the desert and soil erosion area is 50 20~2000μm.

[0039] Example 1

[0040] A desert sand-based artificial earth grid sand barrier is prepared by the following raw materials in parts by weight: 93% of coal-sand-ash mixture (coal slag: desert sand: fly ash = 1:6:5), 7% of activator, and 11% of tap water. The coal slag must be crushed by a jaw crusher, and the 0.15mm sieve-surface crushed coal slag is used as the mixing raw material, and the desert sand and fly ash are directly used as raw materials for mixing; the fly ash and coal slag are from Jingneng Thermal Power Co., Ltd., Kangbashi District, Ordos City, Inner Mongolia Autonomous Region, and the desert sand is from the Kubuqi Desert in Ordos.

[0041] A method for preparing a desert sand-based artificial earth grid sand barrier comprises the following steps:

[0042] (1) Take an appropriate amount of coal slag and crush it with a jaw crusher. Pass the crushed coal slag through a 0.15 mm square hole sieve, and seal the part above the sieve for subsequent experiments.

[0043] (2) Take a set weight portion of crushed coal slag, desert sand, and fly ash in a mixer and stir for 3 minutes, then add a specific weight portion of water and stir for another minute.

[0044] (3) The mixture is filled into a mold and compacted using a press with the pressure set to 160 kN.

[0045] (4) After demoulding, the molded product is sealed with a water-proof film and placed in a curing box for standard curing at a temperature of 20°C and a humidity of 90% RH. The molded product is taken out at a specified age for analysis and testing.

[0046] After the above experiments, the experimental results of the indoor experimental product of the desert sand-based artificial earth grid sand barrier of this embodiment are as follows:

[0047]

[0048] Example 2

[0049] A desert sand-based artificial earth grid sand barrier is prepared by the following raw materials in parts by weight: 95% of coal-sand-ash mixture (coal slag: desert sand: fly ash = 1:6:5), 5% of activator, and 11% of tap water. The coal slag must be crushed by a jaw crusher, and the 0.15mm sieve-surface crushed coal slag is used as the mixing raw material, and the desert sand and fly ash are directly used as raw materials for mixing; the fly ash and coal slag are from Jingneng Thermal Power Co., Ltd., Kangbashi District, Ordos City, Inner Mongolia Autonomous Region, and the desert sand is from the Kubuqi Desert in Ordos.

[0050] A method for preparing a desert sand-based artificial earth grid sand barrier comprises the following steps:

[0051] (1) Take an appropriate amount of coal slag and crush it with a jaw crusher. Pass the crushed coal slag through a 0.15 mm square hole sieve, and seal the part above the sieve for subsequent experiments.

[0052] (2) Take a set weight portion of crushed coal slag, desert sand, and fly ash in a mixer and stir for 3 minutes, then add a specific weight portion of water and stir for another minute.

[0053] (3) The mixture is filled into a mold and compacted using a press with the pressure set to 160 kN.

[0054] (4) After demoulding, the molded product is sealed with a water-proof film and placed in a curing box for standard curing at a temperature of 20°C and a humidity of 90% RH. The molded product is taken out at a specified age for analysis and testing.

[0055] After the above experiments, the experimental results of the indoor experimental product of the desert sand-based artificial earth grid sand barrier of this embodiment are as follows:

[0056]

[0057] Example 3

[0058] A desert sand-based artificial earth grid sand barrier is prepared by the following raw materials in parts by weight: 97% coal-sand-ash mixture (coal furnace slag: desert sand: fly ash = 1:6:5), 3% activator, and 11% tap water. The coal furnace slag must be crushed by a jaw crusher, and the 0.15mm sieve-surface crushed coal furnace is used as the mixing raw material, and the desert sand and fly ash are directly taken from the raw materials for mixing; the fly ash and coal furnace slag are from Jingneng Thermal Power Co., Ltd., Kangbashi District, Ordos City, Inner Mongolia Autonomous Region, and the desert sand is taken from the Kubuqi Desert in Ordos.

[0059] A method for preparing a desert sand-based artificial earth grid sand barrier comprises the following steps:

[0060] (1) Take an appropriate amount of coal slag and crush it with a jaw crusher. Pass the crushed coal slag through a 0.15 mm square hole sieve, and seal the part above the sieve for subsequent experiments.

[0061] (2) Take a set weight portion of crushed coal slag, desert sand, and fly ash in a mixer and stir for 3 minutes, then add a specific weight portion of water and stir for another minute.

[0062] (3) The mixture is filled into a mold and compacted using a press with the pressure set to 160 kN.

[0063] (4) After demoulding, the molded product is sealed with a water-proof film and placed in a curing box for standard curing at a temperature of 20°C and a humidity of 90% RH. The molded product is taken out at a specified age for analysis and testing.

[0064] After the above experiments, the experimental results of the indoor experimental product of the desert sand-based artificial earth grid sand barrier of this embodiment are as follows:

[0065]

[0066] The above embodiments are applicable to the use of sand barriers in various terrains in desert areas. The sand barriers prepared by this method have high compressive strength and stable physical properties. They have been produced in construction and have high practical value.

[0067] Finally, it should be noted that the contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. The above description is only the preferred embodiment of the present invention and is not used to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A desert sand-based artificial earth grid sand barrier, wherein the components are calculated by mass percentage and are characterized by: It includes a coal-sand-ash mixture and an activator, wherein the coal-sand-ash mixture accounts for 93-97%, the activator accounts for 1-10%, and the external water ratio is 5-15%.

2. The desert sand-based artificial earth grid sand barrier according to claim 1, characterized in that: The coal-sand-ash mixture is prepared by mixing coal slag, desert sand and fly ash in a mass ratio, wherein the mass ratio of each component is coal slag: desert sand: fly ash = 1:3-10:2-8.

3. The desert sand-based artificial earth grid sand barrier according to claim 2, characterized in that: The coal slag and fly ash are solid waste raw materials generated by burning coal.

4. The desert sand-based artificial earth grid sand barrier according to claim 1, characterized in that: The activator is made of the following raw materials in parts by weight: 70-85 parts by weight of mineral powder, 10-25 parts by weight of alkaline activator, and 1-5 parts by weight of surfactant.

5. The desert sand-based artificial earth grid sand barrier according to claim 4, characterized in that: The mineral powder has a moisture content of less than 4%.

6. The desert sand-based artificial earth grid sand barrier according to claim 4, characterized in that: The alkaline activator includes one or more of Na2C03, NaOH, Na2S04, KAl(S04)2.6H20, K2N02, NaF, K2C03 or a combination thereof with cement clinker.

7. The desert sand-based artificial earth grid sand barrier according to claim 4, characterized in that: The surfactant is a composite of one or more of triethanolamine, sulfite pulp waste liquid, sodium acetate, sodium lignosulfonate, calcium lignosulfonate or a composite of the surfactant and urea.

8. A method for preparing a desert sand-based artificial earth grid sand barrier as claimed in claim 1, characterized in that: The following steps are involved: S1: The coal slag is crushed by a crusher, the crushed coal slag is screened by a square hole sieve, and the part above the sieve is sealed; S2: taking out the crushed coal slag sealed in step S1, mixing the coal slag with desert sand and fly ash in a mixer, adding water and stirring again to obtain a mixed material; S3: filling the mixed material obtained in step S2 into a mold, and compacting and molding it using a press to obtain a compacted desert sand-based artificial earth grid; S4: demolding the desert sand-based artificial earth grid compacted in step S3, encapsulating it with a waterproof film, and placing it in a curing box for curing. After the curing time reaches a specified age, the desert sand-based artificial earth grid is taken out, and the preparation of the desert sand-based artificial earth grid is completed.

9. A method for using the desert sand-based artificial earth grid sand barrier according to claim 1, characterized in that: include: The desert sand-based artificial soil grid is laid horizontally in the desert and soil erosion areas.

10. The method for using the desert sand-based artificial earth grid sand barrier according to claim 9, characterized in that: The desert sand-based artificial soil grid is laid in a grid of 0.5m×0.5m-5m×5m.

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