Modified fly ash foam stabilizer, preparation method and application thereof

Abstract

The present application relates to the technical field of industrial solid waste resource utilization, in particular to a modified fly ash foam stabilizer and its preparation method and application, the foam stabilizer is composed of superfine fly ash (0.5%-1.0%), acetic acid (0.25‰-0.75‰) and water. The preparation process includes fly ash grinding and screening, acetic acid ultrasonic treatment, suction filtration and drying. The foam stabilizer has the characteristics of uniform bubbles and stable performance, and the production process is simple. The efficient and clean conversion and utilization of solid waste is realized, a new way of high-value utilization of fly ash is opened up, and the concept of circular economy is met. The foam stabilizer has significant economic and environmental benefits.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial solid waste resource utilization, and particularly relates to a modified fly ash foam stabilizer and a preparation method and application thereof. BACKGROUND

[0002] With the wide application of foam technology in various fields such as building materials, cosmetics, food industry, pharmaceutical manufacturing and mineral processing, the requirements for the stability and performance of foam are increasingly improved. Foam materials, including but not limited to foamed concrete, foamed plastic, foamed metal, food foaming agent and foam formula in cosmetics, all need to maintain stable foam structure from preparation to final application or consumption stage to ensure excellent physical properties, processing performance and use effect. In this context, foam stabilizer (foam stabilizer) as a key additive, its importance is increasingly prominent.

[0003] Traditional foam stabilizers are mainly divided into three categories: synergistic type, viscosity-increasing type and nano solid particles. Each type has its own unique advantages and limitations. Synergistic foam stabilizers can improve foam stability through synergistic action of multiple mechanisms, but the effect is often limited when used alone, and often needs to be compounded with other types of foam stabilizers to enhance the effect; viscosity-increasing foam stabilizers stabilize foam by increasing the viscosity of the liquid, but have the disadvantages of easy caking of raw materials, complex processing process and possible influence on product transparency; nano solid particles exhibit good foam stabilization effect due to their unique surface properties and nano effect, but high production cost and use restrictions limit their wide application.

[0004] In view of the above challenges, exploring new foam stabilizers with low cost, high efficiency and environmental protection has become a research hotspot. Fly ash, as an industrial by-product produced in large quantities in thermal power plants, not only has a huge stock, but also has good physical and chemical properties. Its low price and potential environmental friendly properties make it an ideal building material modifier.

[0005] Therefore, developing a method for modifying fly ash to enhance its foam stability in various application scenarios not only can improve the overall performance of foam products, but also can realize the high-value utilization of industrial waste, which has important environmental and economic significance. SUMMARY

[0006] To solve the problems of the prior art, the present application provides a modified fly ash foam stabilizer and a preparation method and application thereof, which aims to develop a new type of foam stabilizer with low cost, significant effect and environmental friendliness through modified fly ash technology, not only solves the problems of poor foam stabilization performance, complex processing process and high production cost of traditional foam stabilizers, but also promotes the recycling of industrial waste, which has important economic and environmental value.

[0007] Specifically, the application provides a modified fly ash foam stabilizer, which is composed of the following components in percentage by mass:

[0008] 0.5-1.0% of superfine fly ash, 0.25-0.75‰ of acetic acid, and the rest of water;

[0009] The particle size of the superfine fly ash is less than 45 μm.

[0010] In some specific embodiments of the application, the preparation method of the modified fly ash foam stabilizer comprises the following preparation steps: grinding and screening fly ash to obtain superfine fly ash, then mixing the superfine fly ash with acetic acid and water, performing ultrasonic treatment on the acetic acid, and then performing filtration and drying treatment, and finally obtaining the modified fly ash foam stabilizer.

[0011] The percentage by mass of the superfine fly ash, acetic acid and water is as follows: 0.5-1.0% of superfine fly ash, 0.25-0.75‰ of acetic acid, and the rest of water.

[0012] The particle size of the superfine fly ash is less than 45 μm.

[0013] In some specific embodiments of the application, the specific method for grinding and screening the fly ash is as follows: using a ball mill to grind the fly ash for 15-25 min, and then using a 325 mesh standard sieve to screen the ground fly ash to obtain superfine fly ash.

[0014] In some specific embodiments of the application, the ultrasonic frequency of the acetic acid ultrasonic treatment is 60-120 KHz, and the acetic acid ultrasonic treatment time is 10-30 min.

[0015] In some specific embodiments of the application, the specific method for filtration and drying is as follows: filtering the fly ash after acetic acid ultrasonic treatment through a vacuum filter for 15-30 min, and drying in a 120℃ oven for 1-2 h.

[0016] The application further provides a preparation method of a modified fly ash foam stabilizer, which comprises the following preparation steps: grinding and screening fly ash to obtain superfine fly ash, then mixing the superfine fly ash with acetic acid and water, performing ultrasonic treatment on the acetic acid, and then performing filtration and drying treatment, and finally obtaining the modified fly ash foam stabilizer.

[0017] In some specific embodiments of the application, the specific method for grinding and screening the fly ash is as follows: using a ball mill to grind the fly ash for 15-25 min, and then using a 325 mesh standard sieve to screen the ground fly ash to obtain superfine fly ash.

[0018] In some embodiments of the present application, the ultrasonic frequency of the acetic acid ultrasonic is 60-120 KHz, and the acetic acid ultrasonic time is 10 min-30 min.

[0019] In some embodiments of the present application, the specific method of filtration and drying is that the fly ash after acetic acid ultrasonic treatment is filtered through a vacuum filter for 15 min-30 min, and is placed in an oven at 120℃ for drying for 1 h-2 h.

[0020] The present application also provides the use of the modified fly ash foam stabilizer of any one of the above or prepared by the preparation method of any one of the above in building materials, petroleum industry, mineral processing, chemical foaming and environmental engineering.

[0021] In some embodiments of the present application, the modified fly ash foam stabilizer of any one of the above or prepared by the preparation method of any one of the above can be used in building materials for preparing foam concrete; can also be used in drilling fluid of petroleum industry to improve the stability and lubricating performance of the mud; can also be used as a mineral processing flotation agent to improve the mineral recovery rate and purity; can also be used in chemical foaming to control the foam size and uniformity. In addition, it can also be used in environmental engineering fields such as sewage treatment and waste gas treatment, as an adsorbent and stabilizer.

[0022] The present application has the following remarkable advantages and effects relative to the prior art:

[0023] Firstly, the prepared foam stabilizer can be directly added to the foaming liquid, which is simple and fast to operate, and does not require complex pretreatment steps, greatly improving the production efficiency. Secondly, after sufficient mixing and physical foaming, the obtained foam exhibits excellent foam stability, significantly improving the quality and stability of the product. Furthermore, the entire preparation process is simple and easy to implement, not only reducing the labor and time costs, but also reducing the energy consumption, meeting the requirements of energy saving and environmental protection.

[0024] In addition, since fly ash is used as the main raw material for modification, high-value utilization of industrial waste is achieved, reducing the pressure on the environment and making a positive contribution to sustainable development. DETAILED DESCRIPTION

[0025] The present application will be further described in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. Furthermore, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or changes to the present application, and these equivalent forms also fall within the scope defined by the present application.

[0026] Example 1

[0027] The raw materials, ordinary fly ash: water = 120:20000, were weighed in the following parts, and after being mixed thoroughly, 50 parts of foaming agent were added to prepare bubbles; then the bubble water bleeding amount and the settlement distance were tested. The bubble water bleeding amount prepared in this example was 78-93 mL in 1 h, and the settlement distance was 9-14 mm.

[0028] Example 2

[0029] The raw materials, ordinary fly ash: water = 120:20000, were weighed in the following parts, and after being mixed thoroughly, 50 parts of foaming agent were added to prepare bubbles; then the bubble water bleeding amount and the settlement distance were tested. The bubble water bleeding amount prepared in this example was 78-93 mL in 1 h, and the settlement distance was 9-14 mm.

[0030] Example 3

[0031] The fly ash was ground for 20 min, and then ultra-fine fly ash was obtained by sieving treatment using a 325 mesh standard sieve. Then the raw materials, ultra-fine fly ash: water = 120:20000, were weighed in the following parts, and after being mixed thoroughly, 50 parts of foaming agent were added to prepare bubbles; then the bubble water bleeding amount and the settlement distance were tested. The bubble water bleeding amount prepared in this example was 72-83 mL in 1 h, and the settlement distance was 8-11 mm.

[0032] Example 4

[0033] The fly ash was ground for 20 min, and then ultra-fine fly ash was obtained by sieving treatment using a 325 mesh standard sieve. Then the raw materials, ultra-fine fly ash: acetic acid: water = 120:10:20000, were weighed in the following parts, and after being mixed thoroughly, filtered and dried, 50 parts of foaming agent were added to prepare bubbles; then the bubble water bleeding amount and the settlement distance were tested. The bubble water bleeding amount prepared in this example was 50-62 mL in 1 h, and the settlement distance was 6-7.5 mm.

[0034] Example 5

[0035] The fly ash was ground for 20 min, and then ultra-fine fly ash was obtained by sieving treatment using a 325 mesh standard sieve. Then the raw materials, ultra-fine fly ash: acetic acid: water = 120:10:20000, were weighed in the following parts, and after being mixed thoroughly, ultrasonic treatment (frequency 60 KHz) of acetic acid for 20 min, filtering and drying, 50 parts of foaming agent were added to prepare bubbles; then the bubble water bleeding amount and the settlement distance were tested. The bubble water bleeding amount prepared in this example was 42-56 mL in 1 h, and the settlement distance was 4.5-6.5 mm. The 7d strength of the foam concrete prepared in this example using the foam stabilizer was increased by 20%-40% compared with that of Comparative Example 1.

[0036] Example 6

[0037] The fly ash was ground for 20 min, and then sieved using a 325 mesh standard sieve to obtain ultra-fine fly ash. Then, the following amounts of raw materials were weighed: ultra-fine fly ash: acetic acid: water = 120: 10: 20000, and after being thoroughly mixed, acetic acid was ultrasonically treated (frequency 120 KHz) for 20 min, filtered, and dried, 50 parts of a foaming agent was added to prepare the bubbles. Then, the water bleeding amount and the sedimentation distance of the bubbles were tested. The water bleeding amount of the bubbles prepared in this example was 30-36 mL, and the sedimentation distance was 2.5-4 mm. The 7d strength of the foam concrete prepared using the foam stabilizer in this example was increased by 60%-70% compared to Comparative Example 1. The cost of the raw materials was 15%-20% of that of Comparative Example 4.

[0038] Comparative Examples 1-4

[0039] Comparative Example 1:

[0040] The foaming agent was directly mixed with water in a ratio of 50:2000, and a physical foaming method was used to prepare the bubbles of Comparative Example 1. The water bleeding amount of the bubbles prepared in Comparative Example 1 was 68-95 mL, and the sedimentation distance was 8.5-11.5 mm.

[0041] Comparative Example 2:

[0042] 10-50 parts of calcium stearate (synergistic) foam stabilizer was added to Comparative Example 1 to obtain the bubbles prepared in Comparative Example 2. The water bleeding amount of the bubbles prepared in Comparative Example 2 was 64-82 mL, and the sedimentation distance was 7.5-9.5 mm.

[0043] Comparative Example 3:

[0044] 10-50 parts of xanthan gum (tackifying) foam stabilizer was added to Comparative Example 1 to obtain the bubbles prepared in Comparative Example 3. The water bleeding amount of the bubbles prepared in Comparative Example 3 was 52-64 mL, and the sedimentation distance was 5-8 mm.

[0045] Comparative Example 4:

[0046] 10-50 parts of nano-silicon dioxide was added to Comparative Example 1, and after being subjected to magnetic stirring and acetic acid ultrasonic treatment, the bubbles prepared in Comparative Example 4 were obtained. The water bleeding amount of the bubbles prepared in Comparative Example 4 was 57-64 mL, and the sedimentation distance was 5-7.5 mm.

[0047] The test results show that, compared with the comparative examples, the examples have the effect of improving the stability of the bubbles and thus improving the strength of the foam concrete, avoiding the destruction of the foam before the initial setting of the concrete, and having a cost advantage.

[0048] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A modified fly ash foam stabilizer, characterized by, The modified fly ash foam stabilizer is composed of the following components in mass percentage: 0.5%~1.0% of superfine fly ash, 0.25‰~0.75‰ of acetic acid, and the rest of water; The particle size of the superfine fly ash is <45 μm. The preparation method of the modified fly ash foam stabilizer comprises the following steps: grinding and screening fly ash to obtain superfine fly ash, then mixing the superfine fly ash with acetic acid and water, performing acetic acid ultrasonic treatment, and then performing filtration and drying treatment, and finally obtaining the modified fly ash foam stabilizer.

2. The modified fly ash foam stabilizer of claim 1, wherein, The specific method for grinding and screening the fly ash is: using a ball mill to grind the fly ash for 15 min~25 min, and then using a 325 mesh standard sieve to screen the ground fly ash to obtain superfine fly ash.

3. The modified fly ash foam stabilizer of claim 1, wherein, The ultrasonic frequency of the acetic acid ultrasonic treatment is 60~120 KHz, and the acetic acid ultrasonic treatment time is 10 min~30 min.

4. The modified fly ash foam stabilizer of any one of claims 1-3, wherein, The specific method for filtration and drying is: filtering the fly ash after acetic acid ultrasonic treatment through a vacuum filter for 15 min~30 min, and drying in a 120℃ oven for 1 h~2 h.

5. A method of preparing a modified fly ash stabilizing agent, characterized by, The preparation method comprises the following steps: grinding and screening fly ash to obtain superfine fly ash, then mixing the superfine fly ash with acetic acid and water, performing acetic acid ultrasonic treatment, and then performing filtration and drying treatment, and finally obtaining the modified fly ash foam stabilizer, The mass percentage of the superfine fly ash, acetic acid and water is: 0.5%~1.0% of superfine fly ash, 0.25‰~0.75‰ of acetic acid, and the rest of water; The particle size of the superfine fly ash is <45 μm.

6. The method of claim 5, wherein the modified fly ash foam stabilizer is prepared by the steps of: The specific method for grinding and screening the fly ash is: using a ball mill to grind the fly ash for 15 min~25 min, and then using a 325 mesh standard sieve to screen the ground fly ash to obtain superfine fly ash.

7. The method of claim 5, wherein the modified fly ash foam stabilizer is prepared by the steps of: The ultrasonic frequency of the acetic acid ultrasonic treatment is 60~120 KHz, and the acetic acid ultrasonic treatment time is 10 min~30 min.

8. The method of claim any one of claims 5-7, wherein the modified fly ash foam stabilizer is prepared by, The specific method for filtration and drying is: filtering the fly ash after acetic acid ultrasonic treatment through a vacuum filter for 15 min~30 min, and drying in a 120℃ oven for 1 h~2 h.

9. The modified fly ash foam stabilizer of any one of claims 1-4 or the modified fly ash foam stabilizer prepared by the preparation method of any one of claims 5-8 is applied in building materials, petroleum industry, mineral processing, chemical foaming and environmental engineering.