Fiber foam light soil prepared from municipal solid waste incineration bottom ash and method thereof

Abstract

The invention relates to the technical field of building material manufacturing, in particular to fiber foam light soil prepared from municipal solid waste incineration bottom ash and a method of the fiber foam light soil. The fiber foam light soil is prepared from the following substances: cement, municipal solid waste incineration bottom ash, raw material soil, a fiber admixture, a water reducing agent, an alkaline reagent and water. The solid waste-municipal solid waste incineration bottom ash is adopted as the foaming agent to replace a traditional organic foaming agent, on one hand, the cost of the foaming agent is reduced, and on the other hand, the treatment problem of municipal solid waste incineration bottom ash solid waste is effectively solved. Meanwhile, the light soil is solidified by hydrated calcium aluminosilicate gel generated through alkali excitation by adopting the municipal waste incineration bottom ash, so that the cement can be greatly replaced, the carbon emission is reduced, and the strength performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building material production, in particular to a kind of fiber foam light soil prepared by application of municipal solid waste incineration bottom ash and a method thereof. BACKGROUND

[0002] With the increasingly serious problem of "garbage around the city", municipal solid waste incineration technology is becoming the main development direction of municipal solid waste treatment due to its significant advantages. This technology efficiently converts the chemical energy in waste into heat and electricity, with high processing efficiency, small land occupation, complete reduction, and high degree of harmlessness. The bottom ash produced during incineration, as the main by-product, accounts for 80% to 90% of the total output. If such a large amount of incineration bottom ash cannot be effectively recycled, it will not only waste resources, but also pose a serious secondary pollution risk to the atmospheric environment and soil ecology.

[0003] Foam light soil is a new type of light filling material applied in the field of civil engineering in recent years. Foam light soil is mainly prepared by mixing cement, soil and foam. Traditional foam light soil uses a large amount of foaming agent to produce a large number of pores, thereby achieving lightweight, insulation and heat insulation. However, due to the high price of foaming agent, easy cracking, low strength and potential chemical pollution risk, its market acceptance is limited, making it difficult to be widely applied and promoted. Therefore, it is necessary to develop a foam light soil with low cost, high toughness, high strength and no pollution.

[0004] The existing foam light soil is prepared by mixing a foaming agent aqueous solution mechanically foamed by a bubble machine with cement paste and admixtures (such as fly ash, slag, etc.) in a specific ratio, stirring, and pouring and natural curing process. The material forms a large number of uniformly distributed closed pore structures inside, making it have excellent properties such as light weight, thermal insulation and sound insulation. The above-mentioned foaming agents such as rosin-type foaming agent, protein-type foaming agent and surfactant-type foaming agent are composed of organic molecules, which are relatively expensive and some foaming agents have certain organic chemical pollution risk, making the market acceptance of existing foam light soil relatively limited. It is necessary to find a new type of foaming agent that is low in price and environmentally friendly. In addition, the existing foam light soil has problems such as low compressive and flexural strength (insufficient toughness), easy cracking (poor toughness, rapid shrinkage of light soil matrix after water loss, difficulty in removing heat generated during curing chemical reaction, resulting in temperature rise and volume expansion), which further limits the application of existing foam light soil. In summary, it is urgent to develop a new type of foam light soil preparation method with low foaming cost, low carbon, environmental protection, no pollution, high strength and high toughness. SUMMARY

[0005] The present application aims at the technical problems of high foaming cost, easy cracking, low strength, high carbon emission and potential environmental pollution of the existing foamed lightweight soil, which results in limited market acceptance and difficulty in large-scale application. The present application provides a method for preparing fiber foamed lightweight soil from municipal solid waste incineration bottom ash.

[0006] The foamed lightweight soil can solve the problems of high foaming cost, easy cracking, low strength, high carbon emission and potential environmental pollution of the existing foamed lightweight soil. The foamed lightweight soil has the characteristics of low foaming cost, high strength, high toughness, low carbon, environmental protection and no pollution.

[0007] The object of the present application is achieved at least by one of the following technical solutions.

[0008] A fiber foamed lightweight soil prepared from municipal solid waste incineration bottom ash, prepared from the following substances in mass fraction: 300-500 parts of cement, 0.3-450 parts of municipal solid waste incineration bottom ash, 100-500 parts of raw soil, 1.5-15 parts of fiber admixture, 0.3-15 parts of water reducing agent, 0-15 parts of alkaline reagent, and 120-500 parts of water.

[0009] Further preferably, the cement is ordinary portland cement according to the national standard GB 175-2020 "General Portland Cement".

[0010] Further preferably, the fiber admixture is plant fiber and / or mineral fiber, with a fiber length of 5-20 mm and a diameter of 0.01-0.8 mm.

[0011] Further preferably, the municipal solid waste incineration bottom ash contains elemental aluminum, with an oxide content (Al2O3) of ≥3wt%.

[0012] Further preferably, the raw soil is construction waste soil, silt soil, or fine sand with a particle size of less than 8 mm.

[0013] Further preferably, the alkaline reagent is sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate, sodium silicate or potassium silicate, or a mixture of one or more of the above.

[0014] Further preferably, the mass ratio of the municipal solid waste incineration bottom ash to cement is 0.1% to 95%.

[0015] A method for preparing a fiber foamed lightweight soil, comprising the following steps (flow chart as shown in Figure 1 .

[0016] (1) Measure each component material according to the mass ratio in claim 1;

[0017] (2) drying the municipal solid waste incineration bottom ash to remove free water, and then performing physical screening or disc (ball) milling treatment, and taking the bottom ash below 200 mesh for use;

[0018] (3) drying the fiber admixture and taking it for use;

[0019] (4) pre-feeding the cement and raw soil into a stirring container, slowly stirring, and then adding the fiber admixture in small amounts and multiple times to ensure that the mixed materials are uniformly mixed and the fibers are not wound together;

[0020] (5) compounding water, a water reducing agent and an alkaline reagent according to a proportion, adding the municipal solid waste incineration bottom ash mixed uniformly, and then pouring into the stirring container to stir together with the cement, the raw soil and the fiber admixture for 2-6 minutes to obtain a foamed lightweight soil slurry;

[0021] (6) pouring the obtained fresh foamed lightweight soil slurry into a mold for static pressure forming, curing for 1-2 days to remove the mold, obtaining a pre-solidified foamed lightweight soil, and then placing it in a standard curing room for curing until a specified age to obtain a new type of fiber foamed lightweight soil based on municipal solid waste incineration bottom ash.

[0022] In the above method, in step (2), the drying temperature is 100±5℃, and the time is 12-24h.

[0023] In the above method, in step (3), the drying temperature is 40-60℃, and the drying time is 8-24h.

[0024] In the above method, in step (4), the slow stirring speed is 200-600r / min, and the stirring time is 2-6min; after adding the fiber admixture, the stirring speed is 400-800r / min, and the stirring time is 2-6min.

[0025] The mechanism of the present application is that the composition of elemental aluminum in the municipal solid waste incineration bottom ash is used to perform an alkali metal aluminum swelling reaction (Al+2OH - →AlO2 -On the one hand, the production of hydrogen gas, H2↑, realizes the foaming effect; on the other hand, the excitation of the alkaline OH- to the silicate and aluminate in the bottom ash can generate hydrated calcium silicate and aluminate gel, further solidifying the soil and improving the mechanical properties of the lightweight soil. The plant fiber or mineral fiber incorporated can provide bridging action to enhance the toughness of the lightweight soil; and due to the high stiffness of the plant fiber and the high compressive strength of the mineral fiber, the compressive strength of the foamed lightweight soil is improved; importantly, the plant fiber (hollow structure) and the hollow structure mineral fiber not only can guide out the gas heat and reduce the generation of cracks in the foamed lightweight soil, but also can realize the solidification and stability of the pollutants in the foamed lightweight soil through the action of capillary force and the surface of hydroxyl, so the foamed lightweight soil has the advantages of safety and environmental protection.

[0026] Compared with the prior art, the advantages of the present application are as follows:

[0027] (1) The present application uses solid waste-city garbage incineration bottom ash as a foaming agent to replace the traditional organic foaming agent, which not only reduces the cost of the foaming agent, but also effectively solves the problem of disposal of solid waste-city garbage incineration bottom ash. At the same time, the hydrated calcium silicate and aluminate gel solidified lightweight soil generated by the alkaline excitation of the city garbage incineration bottom ash can greatly replace the amount of cement, reduce carbon emissions and improve the strength performance.

[0028] (2) Compared with the existing foamed lightweight soil, the incorporation of plant fiber or hollow structure mineral fiber can enhance the toughness performance of the foamed lightweight soil; the chemical reaction heat generated in the preparation process of the existing foamed lightweight soil is difficult to discharge, which makes it prone to cracking. The incorporated fiber can act as a pore guide to effectively reduce the cracking risk of the foamed lightweight soil. On the other hand, the high stiffness of the plant fiber and the high compressive strength of the mineral fiber can effectively enhance the strength performance of the foamed lightweight soil; the hollow structure of the fiber can adsorb and solidify potential pollutants in the foamed lightweight soil, realizing the environmental protection, safety and reliability of the foamed lightweight soil. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is the process flow chart of the present application for preparing a new type of fiber foamed lightweight soil using city garbage incineration bottom ash.

[0030] Figure 2 is a schematic diagram of the action mechanism of the new type of fiber foamed lightweight soil prepared by the present application.

[0031] Figure 3 is the internal structure of the fiber foamed lightweight soil sample of the present application: (a) foamed lightweight soil without fiber (product prepared in Example 1), (b) foamed lightweight soil with bamboo fiber (product prepared in Example 2). DETAILED DESCRIPTION

[0032] The application provides a method for preparing fiber foam light soil by using municipal solid waste incineration bottom ash. In order to make the technical solutions, implementation purposes and beneficial effects of the application clearer and more explicit, the following detailed description is made. It should be pointed out that the following specific embodiments are only used to explain the application and do not constitute a limitation on the protection scope of the application.

[0033] The raw soil used in the following examples is the spoil produced in the process of engineering construction; the municipal solid waste incineration bottom ash is from a certain waste incineration power plant in the south, and its composition contains elemental aluminum, and its oxide (Al2O3) is ≥3wt%.

[0034] Example 1: (cement to bottom ash ratio 4:1, no fiber added)

[0035] A fiber foam light soil prepared by using municipal solid waste incineration bottom ash (by mass) takes the following raw material components: 400 parts of P.O 42.5 ordinary portland cement, 100 parts of municipal solid waste incineration bottom ash, 200 parts of raw soil, 300 parts of water, and no additional agent is added.

[0036] (1) The municipal solid waste incineration bottom ash used is dried at 100±5℃ for 24h to remove free water, and then disc milled for 10min, and the obtained product below 200 mesh is screened. The cement and raw soil are pre-put into a stirring container and slowly stirred at a stirring speed of 600r / min for 5min;

[0037] (2) The water and municipal solid waste incineration bottom ash are mixed uniformly according to the proportion, and then poured into the stirring container to be stirred with the cement and municipal solid waste incineration bottom ash for 5min to obtain a foam light soil slurry;

[0038] (3) The obtained fresh foam light soil slurry is poured into a mold for static pressure forming, cured for 1 day to remove the mold, to obtain a pre-solidified foam light soil, which is then placed in a standard curing room for curing for 7 days and 28 days respectively to obtain a new type of fiber foam light soil based on municipal solid waste incineration bottom ash, and related density, porosity and strength performance tests are carried out.

[0039] The test results of the related density, porosity and strength performance tests are shown in Table 1.

[0040] Example 2: (cement to bottom ash ratio 4:1, plant fiber added)

[0041] A kind of application city life garbage incineration bottom ash preparation fiber foam light soil (by mass parts) takes the following raw material components: P.O 42.5 type ordinary portland cement 400 parts, city life garbage incineration bottom ash 100 parts, raw material soil 200 parts, water 300 parts, plant fiber (bamboo fiber) 5 parts, polycarboxylic acid water reducing agent 0.5 parts (considering the influence of fiber water absorption), basic reagent is not added (considering the more cement content).

[0042] (1) the city life garbage incineration bottom ash used is dried at 100±5 ℃ for 24 h to remove free water, then disc mill treatment 10 min, and the obtained below 200 mesh is screened. The plant fiber (bamboo fiber) is dried at 50 ℃ for 12 h, and then used. The cement and raw material soil are pre-placed in a stirring container and slowly stirred at a stirring speed of 600 r / min for 5 min. Then, the plant fiber (bamboo fiber) is added in small amounts and stirred at a stirring speed of 400 r / min for 3 min to ensure that the mixed materials are uniformly mixed and the fibers are not wound together.

[0043] (2) water and polycarboxylic acid water reducing agent are compounded according to the proportion, added to the city garbage incineration bottom ash, mixed uniformly, and then poured into the stirring container. The cement, city life garbage incineration bottom ash and plant fiber (bamboo fiber) obtained in step (1) are stirred together for 5 min to obtain a foam light soil slurry.

[0044] (3) The obtained fresh foam light soil slurry is poured into a mold and statically formed. After 1 day of curing, the mold is removed to obtain a pre-solidified foam light soil. Then, the foam light soil is placed in a standard curing room for curing for 7 days and 28 days, respectively, to obtain a city life garbage incineration bottom ash-based new type of fiber foam light soil. The density, porosity and strength performance tests are carried out.

[0045] The fiber foam light soil is obtained by the above preparation process. The test results of the related density, porosity and strength performance tests are shown in Table 1.

[0046] Example 3: (cement to bottom ash ratio 4:1, mineral fiber addition)

[0047] A kind of application city life garbage incineration bottom ash preparation fiber foam light soil (by mass parts) takes the following raw material components: P.O 42.5 type ordinary portland cement 400 parts, city life garbage incineration bottom ash 100 parts, raw material soil 200 parts, water 300 parts, mineral fiber (halloysite nanotube) 5 parts, polycarboxylic acid water reducing agent 0.5 parts (considering the influence of fiber water absorption), basic reagent is not added (considering the more cement content).

[0048] (1) The municipal solid waste incineration bottom ash used is dried at 100±5°C for 24h to remove free water, then disk milled for 10min, and sieved to obtain the product below 200 mesh. The cement and raw soil are pre-put into the stirring container and slowly stirred at a stirring speed of 600r / min for 5min, then the mineral fiber (halloysite nanotube) is added in small amounts and stirred at a stirring speed of 400r / min for 3min to ensure that the mixed materials are uniformly mixed and do not flocculate together; (2) The water and polycarboxylic acid water reducing agent are compounded according to the proportion, added to the municipal waste incineration bottom ash and mixed uniformly, then poured into the stirring container, and stirred with the cement, municipal solid waste incineration bottom ash and mineral fiber (halloysite nanotube) obtained in step (1) for 5min to obtain a foam lightweight soil slurry;

[0049] (3) The obtained fresh foam lightweight soil slurry is poured into a mold for static pressure forming, demolded after 1 day of curing to obtain a pre-solidified foam lightweight soil, and then placed in a standard curing room for curing for 7 days and 28 days respectively to obtain a new type of fiber foam lightweight soil based on municipal solid waste incineration bottom ash, and related density, porosity and strength performance tests are carried out.

[0050] The fiber foam lightweight soil is obtained by the above preparation process. The test results of the related density, porosity and strength performance are shown in Table 1.

[0051] Example 4: (cement to bottom ash ratio 1:4, addition of alkaline reagent, addition of plant fiber) A kind of application municipal solid waste incineration bottom ash preparation fiber foam lightweight soil (by mass fraction) takes the following raw material components: P.O 42.5 type ordinary Portland cement 100 parts, municipal solid waste incineration bottom ash 400 parts, raw soil 200 parts, water 300 parts, plant fiber (bamboo fiber) 5 parts, polycarboxylic acid water reducing agent 1 part (considering the influence of excess bottom ash water absorption and fiber water absorption), alkaline reagent (compound of sodium silicate and sodium hydroxide) 2 parts.

[0052] (1) The municipal solid waste incineration bottom ash used is dried at 100±5°C for 24h to remove free water, then disk milled for 10min, and sieved to obtain the product below 200 mesh. The cement and raw soil are pre-put into the stirring container and slowly stirred at a stirring speed of 600r / min for 5min, then the mineral fiber (halloysite nanotube) is added in small amounts and stirred at a stirring speed of 400r / min for 3min to ensure that the mixed materials are uniformly mixed and do not flocculate together;

[0053] (2) The water, alkaline reagent and polycarboxylic acid water reducing agent are compounded according to the proportion, added to the municipal waste incineration bottom ash and mixed uniformly, then poured into the stirring container, and stirred with the cement, municipal solid waste incineration bottom ash and plant fiber (bamboo fiber) obtained in step (1) for 5min to obtain a foam lightweight soil slurry;

[0054] (3) Pour the obtained fresh foamed lightweight soil slurry into the mold for static pressure forming, remove the mold after 1 day of curing, obtain the pre-solidified foamed lightweight soil, and then place it in a standard curing chamber for curing for 7 days and 28 days respectively to obtain the new type of fiber foamed lightweight soil based on the bottom ash of municipal solid waste incineration, and perform relevant density, porosity and strength performance tests.

[0055] The fiber foamed lightweight soil is obtained through the above preparation process. The relevant density, porosity and strength performance test results are shown in Table 1.

[0056] Example 5: (cement to bottom ash ratio 1:4, addition of alkaline reagent, addition of mineral fiber) A kind of fiber foamed lightweight soil (by mass) prepared by using municipal solid waste incineration bottom ash takes the following raw material components: P.O 42.5 ordinary portland cement 100 parts, municipal solid waste incineration bottom ash 400 parts, raw soil 200 parts, water 300 parts, plant fiber (bamboo fiber) 5 parts, polycarboxylic acid water reducer 1 part (considering the influence of excess bottom ash water absorption and fiber water absorption), alkaline reagent (sodium silicate and sodium hydroxide compound) 2 parts.

[0057] (1) The municipal solid waste incineration bottom ash used is dried at 100±5℃ for 24h to remove free water, then disk milled for 10min, and sieved to obtain the product below 200 mesh. The cement and raw soil are pre-put into the stirring container and slowly stirred at a stirring speed of 600r / min for 5min, then plant fiber (bamboo fiber) is added in small amounts and stirred at a stirring speed of 400r / min for 3min to ensure that the mixed materials are uniformly mixed and the fibers are not wound together;

[0058] (2) Mix water, alkaline reagent and polycarboxylic acid water reducer according to the proportion, add to the municipal solid waste incineration bottom ash, mix uniformly, then pour into the stirring container, and stir with the cement, municipal solid waste incineration bottom ash and plant fiber (bamboo fiber) obtained in step (1) for 5min to obtain a foamed lightweight soil slurry;

[0059] (3) Pour the obtained fresh foamed lightweight soil slurry into the mold for static pressure forming, remove the mold after 1 day of curing, obtain the pre-solidified foamed lightweight soil, and then place it in a standard curing chamber for curing for 7 days and 28 days respectively to obtain the new type of fiber foamed lightweight soil based on the bottom ash of municipal solid waste incineration, and perform relevant density, porosity and strength performance tests.

[0060] The fiber foamed lightweight soil is obtained through the above preparation process. The relevant density, porosity and strength performance test results are shown in Table 1.

[0061] Table 1 Density and strength performance indicators of fiber foamed lightweight soil

[0062]

[0063] The porosity and density data from Example 1 show that municipal solid waste incineration bottom ash can act as a foaming agent to achieve the formation of foamed lightweight soil; a comparison between Example 2 and Example 1 reveals that the addition of fiber admixtures can densify the matrix structure. Figure 3 This effectively improves the compressive and flexural strength of foamed lightweight soil and reduces the risk of cracking. A comparison of Examples 3 and 2 reveals that the strengthening effect of mineral fibers on the foamed lightweight soil is greater than that of plant fibers, possibly because the polysaccharide components in the plant fibers delay the setting time of the cement. A comparison of Examples 4 and 2, or Examples 5 and 3, shows that the effect of alkali activation on the gel consolidation strengthening of foamed lightweight soil is slightly lower than that of cement.

[0064] This invention uses solid waste—municipal solid waste incineration bottom ash (general solid waste)—as a foaming agent. This is because the bottom ash contains a high content of elemental aluminum, which, in an alkaline, light soil environment, undergoes an alkali metal aluminum swelling reaction (Al + 2OH⁻). - →AlO2 - (+H2↑) generates hydrogen gas, achieving the foaming effect of lightweight soil. Compared with the disadvantages of existing organic foaming agents, which are expensive and pose a certain risk of organic environmental pollution, the foaming agent of this invention is low in cost and safe and environmentally friendly.

[0065] Using solid waste—specifically, municipal solid waste incineration bottom ash (general solid waste)—can serve not only as a foaming agent (as described in point 1) but also as a solidifying agent, replacing high-carbon-emission cement. This is because, in an alkaline lightweight soil environment, the cementing properties of the bottom ash are activated by alkali, achieving the consolidation of the lightweight soil. Compared to existing cement or small amounts of other solid waste solidifying agents, the waste incineration bottom ash used in this invention can significantly replace high-carbon-emission cement, achieving low-carbon production of foamed lightweight soil.

[0066] This invention incorporates environmentally friendly fibers (plant fibers or hollow mineral fibers, such as halloysite nanotubes, etc.) Figure 2As a guide hole effect, toughening (bridging) effect and supporting effect, prevent the foamed lightweight soil from cracking, improve its strength performance, especially the bending strength. In addition, the hollow structure of plant fiber and mineral fiber can realize the solidification and stabilization of pollutants in foamed lightweight soil through the action of capillary force and the surface of hydroxyl group. Compared with the existing problem of easy cracking (crack) of foamed concrete in the curing process, it is due to the poor toughness of foamed lightweight soil, the rapid shrinkage of lightweight soil matrix after curing and the difficulty of heat removal of curing chemical reaction, and the volume expansion caused by temperature rise; Furthermore, the existing foamed lightweight soil has low compressive strength and bending strength, which further limits the application of the existing foamed lightweight soil. The plant fiber or mineral fiber added in the present application can effectively solve the problem of easy cracking of foamed lightweight soil and realize the significant improvement of strength performance.

[0067] It should be understood that the preparation method of the present application is not limited to the above examples, and can be improved or changed according to the above description for those skilled in the art, and all these improvements and changes shall belong to the protection scope of the present application.

Claims

1. A fiber-foamed lightweight soil prepared using bottom ash from municipal solid waste incineration, characterized in that, The product is prepared by weight of the following substances: 300-500 parts cement, 0.3-450 parts municipal solid waste incineration bottom ash, 100-500 parts raw soil, 1.5-15 parts fiber admixture, 0.3-15 parts water-reducing agent, 0-15 parts alkaline reagent, and 120-500 parts water.

2. The fiber-foamed lightweight soil prepared from the bottom ash of municipal solid waste incineration according to claim 1, characterized in that, The fiber blend is plant fiber and / or mineral fiber, with a fiber length of 5 to 20 mm and a diameter of 0.01 to 0.8 mm.

3. The fiber-foamed lightweight soil prepared from the bottom ash of municipal solid waste incineration according to claim 1, characterized in that, The composition of the municipal solid waste incineration bottom ash contains elemental aluminum, expressed as its oxide (Al2O3) ≥3wt%.

4. The fiber-foamed lightweight soil prepared from the bottom ash of municipal solid waste incineration according to claim 1, characterized in that, The raw material soil is construction waste soil, silty soil, or fine sand generated during construction, with a particle size of less than 8 mm.

5. The fiber-foamed lightweight soil prepared from the bottom ash of municipal solid waste incineration according to claim 1, characterized in that, The alkaline reagent is one or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate, sodium silicate, or potassium silicate.

6. The fiber-foamed lightweight soil prepared from the bottom ash of municipal solid waste incineration according to claim 1, characterized in that, The mass ratio of the bottom ash from the incineration of municipal solid waste to cement is 0.1% to 95%.

7. The method for preparing fiber-foamed lightweight soil according to any one of claims 1 to 6, characterized in that, Includes the following steps: (1) Each component material is measured according to the mass ratio in claim 1; (2) Dry the bottom ash of municipal solid waste incineration to remove free moisture, and then perform physical screening or disc (ball) milling to obtain bottom ash with a mesh size of less than 200 for later use; (3) Dry the fiber blend and set aside for later use; (4) Put cement and raw soil into the mixing container in advance and stir slowly. Then add fiber admixture in small amounts several times to ensure that the mixed materials are mixed evenly and that the fibers do not tangle together. (5) Mix water, water-reducing agent and alkaline reagent in proportion, add to municipal solid waste incineration bottom ash and mix evenly, pour into a mixing container, and mix with cement, raw soil and fiber admixture for 2 to 6 minutes to obtain foamed lightweight soil slurry; (6) Pour the obtained freshly mixed foamed lightweight soil slurry into a mold and press it into shape. After curing for 1 to 2 days, remove the mold to obtain pre-cured foamed lightweight soil. Then place it in a standard curing room to cure for the specified age to obtain a new type of fiber foamed lightweight soil based on the bottom ash of municipal solid waste incineration.

8. The preparation method according to claim 7, characterized in that, In step (2), the drying temperature is 100±5℃ and the time is 12~24h.

9. The preparation method according to claim 7, characterized in that, In step (3), the drying temperature is 40-60℃ and the drying time is 8-24h.

10. The preparation method according to claim 7, characterized in that, In step (4), the slow stirring speed is 200-600 r / min and the stirring time is 2-6 min; after adding the fiber admixture, the stirring speed is 400-800 r / min and the stirring time is 2-6 minutes.

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