A snow melting agent prepared by utilizing dust collecting powder from flue gas in the production of ceramic grinding materials and its preparation method

Abstract

The present invention belongs to the technical field of comprehensive utilization of waste resources. In order to solve the problem that the flue gas fraction generated by high-temperature calcination in the current preparation process of ceramic abrasive materials cannot be utilized, a deicing agent and a preparation method thereof are provided. The deicing agent comprises the following raw materials in parts by weight: 10 parts of chloride salt, 0.5-2 parts of acetate, 0-4 parts of anti-slip material, 0.02-2 parts of additives, and 5-20 parts of flue gas powder; the chloride salt is a chloride salt containing crystal water or a chloride salt without crystal water. It has a wide temperature application range of 0-40°C and is environmentally friendly and pollution-free. It is widely used in airports, highways, railways, and places where snow melting and ice de-icing are required; under the same conditions, the use of deicing agent is reduced by more than 5%, the melting rate is increased by more than 20%, the degree of metal corrosion is reduced by more than 15%, and the degree of cement concrete corrosion is reduced by more than 13%.

Description

Technical Field

[0001] The present invention belongs to the technical field of comprehensive utilization of waste resources, and particularly relates to a snow-melting agent prepared by utilizing flue gas dust-collecting powder in the production of ceramic grinding materials, and a preparation method thereof. Background Art

[0002] The production of Chalco balls and Chalco lining bricks requires a series of steps, including ball milling, screening, and calcining. Calcination involves heating materials (such as inorganic substances) to high temperatures, but without melting them, to produce useful physical and chemical changes that transform or remove unwanted substances. The calcination process produces high-temperature gases, which cannot be discharged directly through a chimney. These gases require dust collection and purification to protect the environment. During the dust collection process at Shanxi Ruineng New Materials Co., Ltd., a white powder was collected. This light, water-soluble white powder is currently being stored as solid waste, with no further use found.

[0003] Shanxi Ruineng New Materials Co., Ltd. is one of the earliest manufacturers of ceramic abrasives in China. Its main products are Chalco Aluminum Balls and Chalco Aluminum Lining Bricks. The production process utilizes a roller kiln, whose exhaust system utilizes specialized environmental protection equipment to collect dust. The collected dust is then disposed of as hazardous waste and has yet to be reused. Summary of the Invention

[0004] To address the current issue of unrecyclable flue gas generated during high-temperature calcination during the production of ceramic abrasives, this invention provides a deicing agent and preparation method using the flue gas dust collection powder from ceramic abrasive production. Experimental testing has confirmed that this powder can achieve comprehensive utilization of waste resources, meets national standards and corporate regulations, and produces a highly efficient, pollution-free process.

[0005] The present invention is achieved by the following technical solution: a deicing agent prepared from flue gas dust powder collected during ceramic abrasive material production. The deicing agent comprises the following raw materials by weight: 10 parts chloride salt, 0.5-2 parts acetate, 0-4 parts anti-slip material, 0.02-2 parts additive, and 5-20 parts flue gas powder. The chloride salt may contain or not contain crystal water. The anti-slip material may be omitted depending on actual needs.

[0006] The chloride salt is a mixture of one or more of sodium chloride, calcium chloride or magnesium chloride in any proportion; the acetate salt is a mixture of one or more of calcium acetate or magnesium acetate in any proportion; the anti-slip material is a mixture of one or more of coal slag, fly ash or stone powder in any proportion; the additive is a mixture of one or more of cycloalkylimidazoline quaternary ammonium salt, zinc dihydrogen phosphate, thiourea, fatty amine, sodium dodecylbenzenesulfonate or ammonium chloride in any proportion; the flue gas powder is the dust collecting powder obtained in the flue gas dust collecting bag during the calcination of ceramic grinding materials.

[0007] The chloride salt is prepared by mixing anhydrous sodium chloride, magnesium chloride hexahydrate and calcium chloride dihydrate in a mass ratio of 1:(1-6):(1-10).

[0008] The flue gas powder is white powder, and its main components include sodium ions, calcium ions, chloride ions, sulfate ions, bicarbonate ions, and carbonate ions.

[0009] The method for preparing the de-icing agent comprises the following steps:

[0010] (1) The additive is prepared into an aqueous solution with a mass concentration of 30%-80%, sprayed evenly on the surface of the flue gas powder, and stirred evenly so that the flue gas powder is soaked with the additive;

[0011] (2) The flue gas powder is dried, and then chloride salt, acetate salt, and anti-slip material are added in sequence and mixed evenly to form a snow melting agent.

[0012] The stirring time in step (1) is 5-20 min.

[0013] In step (2), the drying temperature is 90-105° C. and the mixing time is 5-20 min.

[0014] After uniform mixing in step (2), granulation is performed using a granulator.

[0015] Compositional analysis of the flue gas powder used in this invention reveals that it primarily contains NaHCO₃, NaCl, and Na₂SO₄, with trace amounts of sodium sulfite, silica, and aluminum oxide. The flue gas powder is weakly alkaline (pH 8-9) and readily soluble in water, resulting in a light yellow, transparent liquid.

[0016] This invention proposes a recycling method for dust-collecting powder from flue gas during ceramic abrasive production. Experimental testing confirms that this powder can achieve comprehensive utilization of waste resources, meets national standards and corporate regulations, and is highly efficient and pollution-free. Composition analysis confirms that the flue gas powder contains no toxic or hazardous substances such as heavy metals, making it environmentally friendly and pollution-free.

[0017] Composition analysis reveals that the main substances in the flue gas powder are trace amounts of NaHCO₃, NaCl, and Na₂SO₄, all of which have negative freezing points and possess ice-melting properties. Silica and alumina are inorganic powders, present in trace amounts, and possess a certain degree of anti-skid properties, which can be used to prevent slipping during road de-icing. Alternatively, the addition of anti-skid materials can be omitted depending on actual usage requirements. Aside from the trace amount of solid powder, all other components are readily soluble in water and can be prepared into a solution. The flue gas powder is weakly alkaline (pH 8-9), making it relatively mild and harmless to snow-melting pavement. The solution is a light yellow, transparent liquid, and will not contaminate the road surface. Combining the flue gas powder with existing high-efficiency de-icing agents and anti-skid agents significantly improves de-icing performance. Furthermore, the comprehensive utilization of the flue gas powder helps reduce waste disposal costs and the overall cost of de-icing agent products. Therefore, modifying the flue gas powder as a de-icing agent offers significant economic and performance advantages.

[0018] Compared with the existing technology, the flue gas powder composite deicing agent prepared by the method of the present invention has a wide temperature application range of 0 to -40°C, is environmentally friendly and pollution-free, and is widely applicable to airports, highways, railways and places where deicing and anti-freezing are required. Under the same conditions, the amount of deicing agent used is reduced by more than 5%, the melting rate is increased by more than 20%, the degree of metal corrosion is reduced by more than 15%, and the degree of cement concrete corrosion is reduced by more than 13%.

[0019] The deicing agent prepared by the present method incorporates solid waste flue gas powder, helping to reduce carbon emissions and achieve carbon neutrality. It also efficiently utilizes and consumes the flue gas powder, reducing its storage and management costs. This method offers advantages such as high cost-effectiveness, low cost, easy availability, and economical and environmentally friendly properties, making it highly valuable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The ice melting experiment results shown in Example 3;

[0021] Figure 2 This is the antifreeze test result shown in Example 3. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the disclosure and materials cited therein are hereby incorporated by reference.

[0024] Technical equivalents to the specific embodiments described that are apparent to those skilled in the art using no more than routine experimentation are intended to be encompassed by this application.

[0025] The experimental methods in the following examples, unless otherwise specified, are all conventional methods. The instruments and equipment used in the following examples, unless otherwise specified, are all conventional laboratory instruments and equipment; the experimental materials used in the following examples, unless otherwise specified, are all purchased from conventional biochemical reagent stores.

[0026] Example 1: A deicing agent prepared using flue gas powder in refractory material production. The specific preparation method is as follows: prepare the following dried powder: flue gas powder 40.0%, calcium chloride 24.0%, magnesium chloride hexahydrate 11.8%, fatty amine 2.0%, calcium acetate 2.8%, magnesium acetate 2.2%, sodium dodecylbenzene sulfonate 1.2%, fly ash 13.0%, coal slag 3.0%, totaling 100.0%.

[0027] First, a 70% aqueous solution of fatty amine and sodium dodecylbenzenesulfonate was prepared. This solution was then evenly sprayed onto the surface of the flue gas powder and stirred for 15 minutes. The powder was then oven-dried at 80°C. The dried powder was then mixed with other materials and granulated using conventional granulation equipment in a granulator. The resulting powder was then bagged, sealed, and numbered to produce the de-icing agent.

[0028] The prepared deicing agent was tested according to the standard GB / T 23851-2017, and the results are shown in Table 1.

[0029] Table 1: Snow melting agent performance parameters

[0030]

[0031] Table 1 shows that the deicing agent's snow-melting performance is superior to that of sodium chloride and slightly inferior to that of a standard calcium chloride solution. This is due to the inclusion of a cinder anti-skid agent at the same material concentration. The pH of the deicing agent is neutral, making it relatively mild and non-corrosive. The solid dissolution rate, ice melting rate (mL) at -10°C, carbon steel corrosion rate, road friction attenuation rate, relative plant seed damage rate, and heavy metal content all meet national standards or are within the required range. Furthermore, parameters such as relative snow and ice melting capacity can be optimized and adjusted by adjusting the formulation.

[0032] The present invention sampled flue gas powder and prepared flue gas powder aqueous solutions at mass concentrations of 18.0% and 29.0%, respectively. A standard sodium chloride solution (18.0%) and a standard calcium chloride dihydrate solution (29.0%) were prepared in accordance with the national standard GB / T 23851-2017. Deicing capacity was tested in accordance with section 6.5.3.2 of GB / T 23851-2017. The test results are shown in Table 2.

[0033] Table 2 Snow melting effect

[0034]

[0035] Table 2 shows that the snow-melting ability of flue gas powder alone was 92% and 89% higher than that of sodium chloride and calcium chloride dihydrate, respectively. NaCl in flue gas powder is the primary snow-melting component. The snow-melting mechanism is as follows: When salt-based snow-melting agents dissolve in water (snow), their freezing point is below zero degrees Celsius. Sodium chloride, when dissolved in water, freezes at around -10°C, sodium sulfate at around -10°C, sodium bicarbonate at around -4°C, calcium chloride at around -20°C, and acetic acid at around -30°C. Salt water has a lower freezing point than water, making it difficult to form ice after salt dissolves in snow water. Furthermore, when snow-melting agents dissolve in water, the ion concentration in the water increases, causing the liquid phase vapor pressure of the water to decrease, while the solid phase vapor pressure of ice remains unchanged. To achieve a state where the solid and liquid vapor pressures of the ice-water mixture are equal, the ice melts. This principle also explains why salt water is less likely to freeze. Simply put, the snow-melting agent lowers the melting point of snow, making it easier to melt.

[0036] Example 2: A deicing agent prepared from flue gas powder in refractory material production. The specific preparation method is as follows: Prepare the following dried powder: 40.0% flue gas powder, 27.0% calcium chloride, 16.0% magnesium chloride hexahydrate, 3.0% calcium carboxylate, 3.0% calcium acetate, 2.0% magnesium acetate, 1.0% ammonium chloride, and 8.0% coal slag, totaling 100.0%. This powder is then stirred in a high-speed blender in a dry environment, then bagged, numbered, and sealed to prevent moisture, to produce a high-performance deicing agent.

[0037] Testing of the deicing agent's performance yielded the following results: an ice-melting rate of 16.5 mL (60 min) at -10°C, a dissolution rate of 13.6 g / min at 25°C, and a pH range of 7.16-8.65. When the agent's addition ratio was 20% of the mass of the snow to be melted, the freezing point reached -29.1°C, and the relative deicing capacity was 90% at -10°C. The corrosion rate of carbon steel was 0.0081 mm / a, and the spalling rate per unit area of C30 concrete was 2.01 g / m 2The grass seed germination rate was 85.6% for 1% solution and 73.5% for 2% solution. The road friction attenuation was 1.4% on a dry basis and 2.1% on a 20% wet basis. When the chloride concentration in the de-icing material was 30 g / L, the slow-release rate was 92.8% at 40±1°C.

[0038] Example 3: Directly test the flue gas powder. Use a grid to make ice cubes → Prepare sodium chloride and deicing agent with a concentration of 18.0% → Add sodium chloride solution (30 mL), deicing agent (30 mL), and water (30 mL) to three 50 mL beakers and refrigerate for 2 hours (refrigeration temperature 3°C) → Remove three prepared ice cubes, weigh them, and quickly place them into three beakers → Observe the melting process of the ice cubes → Remove the ice cubes with tweezers at regular intervals, quickly weigh them, and record the weight → Stop the experiment until they are completely melted or break apart and cannot be removed. Repeat three times. The results are as follows: Figure 1 .Depend on Figure 1 It can be seen that de-icing agent has the fastest ice melting rate, followed by sodium chloride, and water has the slowest ice melting rate.

[0039] Prepare 40 mL each of 18.0% sodium chloride, 18.0% deicing agent, and water, and place them in a beaker. Then freeze them in a -10℃ refrigerator. After a period of time, pour out the liquid, weigh the solid, and calculate the freezing rate. Repeat this three times and calculate the average value. Figure 2 shown.

[0040] Depend on Figure 2 As can be seen, the freezing rate of water increases linearly. The freezing rates of sodium chloride and deicing agents plateau between 30 and 50 minutes, then rise rapidly between 50 and 60 minutes, ultimately freezing completely along with the water (with freezing rates reaching almost 100%). This suggests that both sodium chloride and deicing agents have an anti-freezing effect before 50 minutes.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A deicing agent prepared from dust collected from flue gas in the production of ceramic abrasive materials, characterized by: The deicing agent comprises the following raw materials in parts by weight: 10 parts of chloride salt, 0.5-2 parts of acetate, 0-4 parts of anti-slip material, 0.02-2 parts of additives, and 5-20 parts of smoke powder; the chloride salt may contain crystal water or may not contain crystal water; The chloride salt is one of calcium chloride or magnesium chloride or a mixture of the two in any proportion; The acetate is a mixture of one or two of calcium acetate or magnesium acetate in any proportion; the anti-slip material is a mixture of one or more of coal slag, fly ash or stone powder in any proportion; the additive is a mixture of one or more of fatty amine, sodium dodecylbenzenesulfonate or ammonium chloride in any proportion; the flue gas powder is the dust collecting powder obtained in the flue gas dust collecting bag during the calcination process of ceramic grinding materials; the flue gas powder is a white powder, mainly containing NaHCO3, NaCl and Na2SO4.

2. A method for preparing the deicing agent according to claim 1, characterized in that: Here are the steps: (1) The additive is prepared into an aqueous solution with a mass concentration of 30%-80%, sprayed evenly on the surface of the flue gas powder, and stirred evenly so that the flue gas powder is soaked with the additive; (2) The flue gas powder is dried, and then chloride salt, acetate salt, and anti-slip material are added in sequence and mixed evenly to form a snow melting agent.

3. The method for preparing a deicing agent according to claim 2, wherein: The stirring time in step (1) is 5-20 min.

4. The method for preparing a deicing agent according to claim 2, wherein: In step (2), the drying temperature is 90-105° C. and the mixing time is 5-20 min.

5. The method for preparing a deicing agent according to claim 2, wherein: After uniform mixing in step (2), granulation is performed using a granulator.

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