A plant-based green de-icing agent material and its preparation method and application

Abstract

The present invention relates to a deicing agent, and in particular to a plant-based green deicing agent material, a preparation method and an application thereof. The plant-based green deicing agent material comprises: 96-97.5 parts of a solid-liquid mixture, 2-3 parts of MgO, and 0.5-1 parts of CaO; wherein the solid-liquid mixture is composed of fly ash powder and raw liquid in a weight ratio of (1-1.3):1; the raw liquid is obtained by liquefying smoke from plant combustion. The deicing agent of the present invention has the advantages of low corrosion and low pollution, and can avoid the impact of chloride salts on road and bridge infrastructure, the environment and water sources. The present invention utilizes plant waste such as corn stalks and rice stalks, and utilizes fly ash industrial waste to achieve resource recycling.

Description

Technical Field

[0001] The invention relates to a deicing agent, and in particular to a plant-based green deicing agent material and a preparation method and application thereof. Background Art

[0002] Snow removal in winter is an important task to ensure smooth and safe roads. At present, the main measures for snow melting and ice removal are mechanical snow removal, manual snow removal and snow melting agent snow removal. The snow removal efficiency of mechanical snow removal is low, and it is easy to cause mechanical damage to the asphalt road surface. Manual snow removal is time-consuming and labor-intensive, and it also affects the efficiency of transportation. Therefore, the snow removal method of snow melting agent is more commonly used. Snow melting agent, also known as deicing salt, achieves the purpose of melting ice and snow by lowering the freezing point of ice and snow. The types of snow melting agents mainly include chloride salts, calcium magnesium acetate (CMA) and organic alcohols. Chloride salt snow melting agents have excellent snow melting performance, but they will cause corrosion to cement concrete structures, steel bars, vehicles and other metal materials. Chloride salts will cause certain pollution to the surrounding soil, water sources and vegetation. The effect of organic alcohol snow melting agents is related to the alcohol content. If you want to achieve a better snow melting effect, the ethylene glycol content is high and the cost is high. At the same time, high content of ethylene glycol is toxic, has a great impact on the environment, needs to be recycled, and has a low friction coefficient. At present, non-chloride environmentally friendly snow-melting agents have attracted much attention. They have good environmental performance and little impact on roads and the ecological environment. However, they are very expensive and have a complex production process. They are only used in areas such as airport runways.

[0003] At present, the most commonly used snow-melting agent is chloride salt-based snow-melting agent, which can quickly melt ice and snow by spraying on asphalt pavement. It has excellent snow-melting performance, but it can cause corrosion to steel bars and bridge structures on the road surface. High-purity calcium chloride, phosphates, and carbonates are less harmful than ordinary sodium chloride snow-melting agents, mainly because they contain anti-corrosion agents. Although they have low corrosion in the short term, they still pose long-term hazards. In the context of achieving the goals of carbon peak and carbon neutrality, the road engineering field has put forward higher requirements for green environmental protection, energy conservation, and emission reduction. Environmentally friendly snow-melting agents are now attracting much attention. However, the existing environmentally friendly deicing agent production process is complicated. For example, in patent CN109266310A, the raw materials need to be degraded by bio-enzyme fermentation; in patent CN109251729A, garbage fly ash is used to prepare deicing agent, and the fly ash needs to be treated harmlessly by heavy metal removal and other methods; in patent CN111394061A, rice slurry wastewater precipitation is used, and the solid lees are mixed with the bottom starch slurry after precipitation as raw materials after adding water, and then the raw materials are anaerobically fermented; in patent CN114410278A, although environmentally friendly materials such as salt lake water chlormagnesia and carnallite are used to save costs and realize resource recycling, the active ingredients are still chloride salts, which have a certain corrosive effect on the environment. Summary of the invention

[0004] The present invention adopts a new plant-based green snow-melting agent with calcium magnesium acetate as the main component, and the bio-based content of the material is about 95%. Plant-based waste such as corn stalks and rice stalks are burned, and the smoke from the combustion is collected and naturally cooled and liquefied to obtain the original base liquid; fly ash is ground into powder and added to the original base liquid; then supplements such as MgO and CaO are added to fully react, and the obtained calcium magnesium acetate product is decolorized to obtain a new plant-based green snow-melting agent.

[0005] A plant-based green snow-melting agent material, the raw materials of which include: a solid-liquid mixture, MgO, and CaO; wherein the solid-liquid mixture is composed of fly ash powder and a raw base liquid; and the raw base liquid is obtained by liquefying smoke from burning plants.

[0006] Furthermore, the solid-liquid mixture is composed of fly ash powder and raw liquid in a weight ratio of (1-1.3):1.

[0007] Furthermore, the raw materials of the plant-based green snow-melting agent material include, by weight: 96-97.5 parts of solid-liquid mixture, 2-3 parts of MgO, and 0.5-1 part of CaO.

[0008] Furthermore, the raw materials of the plant-based green snow-melting agent material include, by weight: 96-97.5 parts of a solid-liquid mixture, 2-3 parts of MgO, and 0.5-1 part of CaO; wherein the solid-liquid mixture is composed of fly ash powder and raw liquid in a weight ratio of (1-1.3):1; the raw liquid is obtained by liquefying smoke from burning plants.

[0009] The effective component of the deicing agent is a low-freezing-point salt compound, and the fly ash and the original base liquid can react chemically to generate calcium magnesium acetate. The solid-liquid mixture of the present invention is composed of fly ash powder and the original base liquid in a weight ratio of (1-1.3):1, mainly to fully react the original base liquid with the fly ash, so that the calcium and magnesium ions in the fly ash can react to generate low-freezing-point salt compounds.

[0010] Furthermore, the raw materials of the plant-based green snow-melting agent material include, by weight: 96-97 parts of solid-liquid mixture, 2.5-3 parts of MgO, and 0.5-1 part of CaO.

[0011] Furthermore, the raw materials of the plant-based green snow-melting agent material include, by weight: 97 parts of solid-liquid mixture, 2.5 parts of MgO, and 0.5 parts of CaO.

[0012] Furthermore, the solid-liquid mixture consists of fly ash powder and raw liquid in a weight ratio of 1.3:1 or 1:1.

[0013] Furthermore, the plants include plant straws, such as corn stalks, rice stalks and other plant wastes.

[0014] The raw liquid can be prepared by conventional methods, which are not particularly limited in the present invention. For example, plant wastes such as corn stalks and rice stalks are burned, and the smoke from the burning is collected and naturally cooled and liquefied to obtain the raw liquid.

[0015] According to an embodiment of the present invention, the plant-based green snow-melting agent material is made of the above-mentioned raw materials.

[0016] The present invention also provides a method for preparing the above-mentioned plant-based green snow-melting agent material, comprising:

[0017] 1) providing the raw liquid; mixing fly ash powder with the raw liquid to obtain a solid-liquid mixture;

[0018] 2) Fully reacting the solid-liquid mixture with MgO and CaO to obtain calcium magnesium acetate product.

[0019] Furthermore, the preparation method further comprises: decolorizing the obtained calcium magnesium acetate product, for example, using activated carbon to decolorize, and obtaining a novel plant-based green snow melting agent after decolorization.

[0020] In some specific examples, the decolorization method includes: filtering the calcium magnesium acetate product obtained by the reaction, and performing a decolorization reaction at 30° C. using activated carbon; using 0.08 g of activated carbon for every 1 ml of calcium magnesium acetate solution, and the decolorization time is 1 hour.

[0021] The present invention also provides application of the plant-based green snow-melting agent material in snow melting.

[0022] The snow melting agent of the present invention has the advantages of low corrosion and low pollution, and can avoid the impact of chloride salt on road and bridge infrastructure, environment and water sources. The present invention utilizes plant waste such as corn stalks and rice stalks, and utilizes fly ash industrial waste to achieve resource recycling.

[0023] The novel plant-based green deicing agent of the present invention has a simple production process, is easy to prepare, has excellent deicing efficiency, realizes the recycling of waste materials, and helps to achieve the dual carbon goals. DETAILED DESCRIPTION

[0024] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product instructions are used. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased through regular channels.

[0025] The preparation method of the original base liquid used below is as follows: burn corn stalks, collect the combustion smoke, and liquefy it after natural cooling to obtain the original base liquid.

[0026] Example 1

[0027] The present embodiment provides a plant-based green snow-melting agent material, the raw materials of which are: 97 parts of solid-liquid mixture, 2.5 parts of MgO, and 0.5 parts of CaO; wherein the solid-liquid mixture is composed of fly ash powder and original base liquid in a weight ratio of 1.3:1.

[0028] Preparation method:

[0029] 1) mixing fly ash powder with the raw liquid to obtain a solid-liquid mixture;

[0030] 2) fully reacting the solid-liquid mixture with MgO and CaO to obtain a calcium magnesium acetate product; and after decolorization, a novel plant-based green snow-melting agent is obtained.

[0031] Example 2

[0032] The present embodiment provides a plant-based green snow-melting agent material, the raw materials of which are: 97 parts of solid-liquid mixture, 2.5 parts of MgO, and 0.5 parts of CaO; wherein the solid-liquid mixture is composed of fly ash powder and original base liquid in a weight ratio of 1:1.

[0033] The preparation method is the same as that of Example 1.

[0034] Example 3

[0035] The present embodiment provides a plant-based green snow-melting agent material, the raw materials of which are: 96 parts of solid-liquid mixture, 3 parts of MgO, and 1 part of CaO; wherein the solid-liquid mixture is composed of fly ash powder and original base liquid in a weight ratio of 1.3:1.

[0036] The preparation method is the same as that of Example 1.

[0037] Comparative Example 1

[0038] This comparative example provides a deicing agent material, which is a solid-liquid mixture composed of fly ash powder and raw base liquid in a weight ratio of 1:1.

[0039] Comparative Example 2

[0040] This comparative example provides a deicing agent material, the raw materials of which are: 97.5 parts of original base liquid, 2.5 parts of MgO, and 0.5 parts of CaO; the raw materials are mixed to form the deicing agent material.

[0041] Comparative Example 3

[0042] This comparative example provides a deicing agent material, the raw materials of which are: 99.5 parts of a solid-liquid mixture and 0.5 parts of CaO; wherein the solid-liquid mixture is composed of fly ash powder and raw base liquid in a weight ratio of 1:1.

[0043] The preparation method comprises the steps of fully reacting the solid-liquid mixture with CaO.

[0044] Taking Example 1 as an example, the market price of the new plant-based green snow-melting agent is 1,470 yuan / ton. It is inexpensive, has strong snow-melting ability, fast snow-melting speed, low corrosiveness, and is green and environmentally friendly.

[0045] (1) Social and economic benefits

[0046] The prices of common deicing agents on the market are shown in Table 1 below:

[0047] Table 1 Prices of different types of de-icing agents

[0048]

[0049] Calculate the market price of 1 ton of plant-based environmentally friendly snow-melting agent, in which corn, rice straw and fly ash are all recycled waste and are not included in the cost. According to the test results, the effective anion content (Ac -1 ) mass ratio is 6-7%. Therefore, the production of 1 ton of plant-based environmentally friendly snow melting agent requires about 20 tons of solid-liquid mixture ②. That is, 10 tons of original base liquid ① and 12 tons of fly ash powder are required.

[0050] Cost = Raw material cost + Production cost

[0051] Raw material cost = magnesium oxide cost + calcium oxide cost = 0.03*20*950 yuan + 0.01*20*1500 yuan = 870 yuan

[0052] Production cost = 600 yuan

[0053] The market price of plant-based environmentally friendly snow-melting agent is 1,470 yuan / ton.

[0054] Experimental Example 1: Ice and Snow Melting Performance

[0055] Different de-icing agent materials were selected to form asphalt mixture and their de-icing rates were tested.

[0056] Ice melting rate method (refer to JT / T 1210.2-2018 "Ice and snow melting materials for highway asphalt mixtures Part 2: Salt materials"): The ice melting rate test is a test method for evaluating the ice and snow melting ability of salt compounds under certain temperature conditions. A 40g ice cube and a Marshall specimen (prepared according to T0702 in JTG E20) that has been cured at low temperature and added with a snow melting agent are used for an ice melting test in an environment box greater than -5°C. The ice mass loss rate dm (i.e., ice melting efficiency / %) is used as an evaluation index for evaluating the ice melting effect of salt compounds. The calculation formula is shown in formula (1):

[0057]

[0058] Where m0 is the initial mass of ice and mt is the mass of ice at time t.

[0059] The test results are shown in Table 2 below:

[0060] Table 2 Ice melting rate test results of asphalt mixture with deicing agent

[0061]

[0062]

[0063] The plant-based green de-icing agent in Example 2 of the present invention has an ice-melting capacity of twice that of chloride-based de-icing agents in half an hour, and an ice-melting capacity of four times that of chloride-based de-icing agents in one hour.

[0064] Experimental Example 2 Environmental Performance

[0065] The environmental performance of different deicing agents was tested, including the carbon steel corrosion rate index (refer to JT / T 1210.2-2018 "Deicing and Snow Melting Materials for Highway Asphalt Mixtures Part 2: Salt Materials"), and the impact on seed damage rate. The results are shown in Table 3 below.

[0066] Table 3 Environmental performance results of asphalt mixture with deicing agent

[0067] Snow Melting Agent Carbon steel corrosion rate mm / year Relative damage rate of plant seeds Chloride salts A 0.14 23％ Chloride salts B 0.2 26％ Calcium acetate, magnesium 0.03 18％ Example 1 ＜0.001 9％ Example 2 ＜0.001 8％ Example 3 ＜0.001 10％ Comparative Example 1 ＜0.001 8％ Comparative Example 2 ＜0.001 9％ Comparative Example 3 ＜0.001 8％

[0068] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A snow melting method, characterized in that: The following plant-based green de-icing agent material with calcium magnesium acetate as the main component is used to melt snow. The raw materials of the plant-based green de-icing agent material include, by weight: 96-97.5 parts of a solid-liquid mixture, 2-3 parts of MgO, and 0.5-1 part of CaO; wherein the solid-liquid mixture is composed of fly ash powder and raw liquid in a weight ratio of (1-1.3):1; the raw liquid is obtained by liquefying smoke from burning plants.

2. The snow melting method according to claim 1, characterized in that: The raw materials include, by weight: 96-97 parts of solid-liquid mixture, 2.5-3 parts of MgO, and 0.5-1 part of CaO.

3. The snow melting method according to claim 1, characterized in that: The raw materials include, by weight: 97 parts of solid-liquid mixture, 2.5 parts of MgO, and 0.5 parts of CaO.

4. The snow melting method according to claim 1, characterized in that: The solid-liquid mixture is composed of fly ash powder and raw liquid in a weight ratio of 1.3:1 or 1:

1.

5. The snow melting method according to any one of claims 1 to 4, characterized in that: The preparation method of the plant-based green deicing agent material comprises the following steps: 1) providing the raw liquid; mixing fly ash powder with the raw liquid to obtain a solid-liquid mixture; 2) The solid-liquid mixture is fully reacted with MgO and CaO to obtain a plant-based green snow-melting agent material with calcium magnesium acetate as the main component.

6. The snow melting method according to claim 5, characterized in that: Step 2) is: fully reacting the solid-liquid mixture with MgO and CaO to decolorize the mixture, thereby obtaining a plant-based green snow-melting agent material with calcium magnesium acetate as the main component.

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