Preparation method of additive for preparing slaked lime with high specific surface area as well as product and application of additive
By using low-temperature plasma activated additives in the preparation process of high specific surface slurry, the problems of temperature control and microstructure optimization are solved, and the preparation of slurry with high specific surface area is achieved, improving the stability and performance of the product.
Patent Information
- Application Number
- CN202510075756.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-04-25
AI Technical Summary
During the preparation process of high-specific surface slurry lime, there are technical difficulties such as difficulty in temperature control, difficulty in optimizing microstructure, and difficulty in precise control of digestive conditions, which limits the stability of its large-scale industrial production and product performance.
By mixing specific ingredients into the aqueous sodium bicarbonate solution and performing low-temperature plasma activation, an additive for the preparation of high specific surface slurry lime is prepared, optimizing the microstructure and reaction process of calcium hydroxide.
The preparation of high specific surface slag lime is realized, the specific surface area is improved, the preparation process is simplified, the production cost is reduced, and the stability and performance of the product are improved.
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Figure CN119874220A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a preparation method of an additive for preparing high specific surface area slaked lime, a product thereof and application thereof, and belongs to the field of preparation of specific functional materials. Background Art
[0002] High specific surface area slaked lime, that is, calcium hydroxide (Ca(OH)2) with a high specific surface area, has shown broad application prospects in many industrial fields due to its unique physical and chemical properties, and has had a profound impact on environmental protection, food processing, and energy utilization. In the field of flue gas desulfurization, the application of high specific surface area slaked lime has significantly improved the desulfurization efficiency. With the increasingly stringent global requirements for air quality, flue gas desulfurization from large industrial emission sources such as coal-fired power plants and steel mills has become a focus of environmental protection. Traditional desulfurizers often have limited specific surface area and low adsorption efficiency, while high specific surface area slaked lime, with its micro-nano structure, increases the contact area with the flue gas, accelerates the absorption reaction of SO2, and effectively reduces the sulfur content in the emissions. In addition, its porous structure is conducive to the rapid diffusion of reaction products, reduces clogging, and extends the service life of the desulfurizer. In terms of sewage treatment, high specific surface area slaked lime also performs well. By adjusting the pH value of sewage, promoting the precipitation of heavy metal ions, and using its strong alkalinity to neutralize acidic wastewater, high-surface-weight slaked lime can effectively remove pollutants from water bodies, and the required dosage is much lower than that of traditional slaked lime, reducing treatment costs. In the food industry, as a food additive, high-surface-weight slaked lime not only improves the texture and taste of food, but can also be used as an antioxidant and stabilizer to extend the shelf life of food and meet consumers' high requirements for food safety and health. In addition, in the fields of engine oil filtration, plastic filling, rubber reinforcement, etc., high-surface-weight slaked lime also plays an irreplaceable role due to its excellent adsorption and reactivity.
[0003] Although high specific surface area slaked lime has broad application prospects, its preparation process faces many technical difficulties and challenges, which not only limit its large-scale industrial production, but also affect the stability of product performance and cost control. First, controlling the reaction temperature is the key to preparing high specific surface area slaked lime. Lime digestion is a strong exothermic reaction. If the temperature is not properly controlled, it will not only cause local overheating, agglomeration of the generated calcium hydroxide particles, reduce the specific surface area, but also may cause safety hazards. Secondly, increasing the specific surface area means that the microstructure of calcium hydroxide needs to be changed from block to micro-nano level. This requires not only optimizing digestion conditions, such as water-cement ratio, digestion time, stirring speed, etc., but also exploring new preparation processes, such as ultrasonic treatment, supercritical fluid technology, etc., to break the limitations of traditional preparation methods. However, these new technologies are often accompanied by high costs and complex operating procedures, which increases the difficulty of industrialization. Furthermore, the optimization of digestion conditions is a systematic project. The various factors are interrelated, and small adjustments may have a significant impact on the performance of the final product. Therefore, how to accurately control these conditions and optimize the process parameters is another major challenge in the preparation of high specific surface area slaked lime. The preparation technology for high specific surface area slaked lime is still immature and lacks unified standards and specifications, which limits the promotion and application of the technology.
[0004] In view of the many difficulties in the preparation of high specific surface area slaked lime, the development of efficient and economical additives has become an important way to break through technical bottlenecks, improve product quality and reduce production costs. The use of additives can not only optimize the microstructure of calcium hydroxide and increase the specific surface area, but also regulate the reaction process, reduce energy consumption and pollution emissions, and has important economic and environmental significance. Additives can promote the formation of micro-nano structures by changing the crystal shape and growth rate of calcium hydroxide. Additives can also effectively improve the dispersibility and stability of calcium hydroxide. During the preparation process, calcium hydroxide particles are prone to agglomeration due to high surface energy, resulting in a decrease in specific surface area. By adding dispersants, the interaction force between particles can be reduced, and its dispersion in the solution can be increased, which is conducive to the formation of a structure with a high specific surface area. At the same time, the use of stabilizers can prevent calcium hydroxide from undergoing phase change or decomposition during storage and transportation, and maintain the stability of its performance. In the process of developing additives, attention should be paid to the combination of innovation and practicality. On the one hand, it is necessary to deeply explore the mechanism of action of additives, understand their regulatory mechanism on the microstructure and performance of calcium hydroxide, and provide a theoretical basis for the development of new and efficient additives. On the other hand, the cost-effectiveness and environmental friendliness of additives should be considered, and materials with wide sources, low prices, and easy recycling or degradation should be selected to reduce production costs and reduce environmental impact. The research and development of additives for the preparation of high specific surface area slaked lime is not only of great significance for overcoming the difficulties of existing preparation technology and improving product quality, but also the key to promoting the upgrading of related industries and achieving sustainable development goals. Summary of the invention
[0005] Purpose of the invention: The technical problem to be solved by the present invention is to provide a preparation method of an additive for preparing high specific surface area slaked lime and its product and application.
[0006] Technical solution: In order to solve the above technical problems, the present invention provides a preparation method for an additive for preparing high specific surface area slaked lime, comprising the following steps: mixing ingredient 1, ingredient 2 and ingredient 3 into a sodium bicarbonate aqueous solution, stirring evenly, and activating the additive by low-temperature plasma; ingredient 1 comprises one or more of propylene glycol, butanetriol, polycaprolactone triol, polyether triol, trimethylolpropane or trimethylolethane; ingredient 2 comprises one or more of dimethylformamide, diethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone or ethyl lactate; ingredient 3 comprises one or more of cyclodextrin, cycloheptose, cyclooctose, maltose, trehalose, cyclopentose or cyclohexose.
[0007] Wherein, the mass ratio of sodium bicarbonate to water in the sodium bicarbonate aqueous solution is 0.05-2.25:100.
[0008] Wherein, the solid-to-liquid ratio of the sodium bicarbonate aqueous solution to ingredient 1 is 2-10:100 g / mL.
[0009] Wherein, the solid-to-liquid ratio of the sodium bicarbonate aqueous solution to ingredient 2 is 1-5:100 g / mL.
[0010] Wherein, the solid-to-liquid ratio of the sodium bicarbonate aqueous solution and ingredient 3 is 0.25-2.75:100 g / mL.
[0011] Wherein, the action time of the low-temperature plasma is 0.25 to 4.25 hours.
[0012] Wherein, the action voltage of the low-temperature plasma is 5 to 75 kV.
[0013] The invention also provides an additive prepared by the preparation method.
[0014] The invention also provides application of the additive in preparing high specific surface area slaked lime.
[0015] Reaction mechanism:
[0016] There are highly chemically active particles such as electrons, ions, free radicals and excited molecules in low-temperature plasma. These particles collide inelastically with gas molecules (or atoms), converting energy into the internal energy of ground-state molecules (or atoms), and a series of processes such as excitation, dissociation and ionization occur. During low-temperature plasma irradiation, plasma can partially oxidize hydrocarbons, break and reorganize chemical bonds in some ingredients in the initial slurry, and form a series of reaction product mixtures accompanied by hydrolysis, polymerization and grafting reactions.
[0017] The process of quicklime turning into slaked lime involves only one reaction equation, namely, CaO+H2O→Ca(OH)2. Therefore, the core mechanism of preparing high specific surface area slaked lime by additives is to achieve the full reaction of CaO and H2O in the quicklime slaked process and the effective regulation of the slaked reaction heat by reasonable additive formulation without changing the slaked reaction. During the slaked reaction, sodium bicarbonate is decomposed by heat to produce carbon dioxide gas, which causes the bubbles to suspend and diffuse, stirring the reaction. The mixed materials in the additives and the mixed products formed by low-temperature plasma irradiation can effectively control the heat and mass transfer process of the reaction between CaO and H2O through attachment, encapsulation and potential adjustment, which is conducive to the preparation of high specific surface area slaked lime.
[0018] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The preparation process of the present invention is simple, and the preparation of an additive for preparing high specific surface area slaked lime is achieved through reasonable material matching and low-temperature plasma activation. The additive prepared by the present invention is simple to use, and quicklime and the additive can be directly mixed, and a high specific surface area slaked lime product can be obtained after the reaction is completed. The content of the present invention can also provide technical reference for the research and development of new digestion additives. The present invention can achieve a maximum specific surface area of 56.19m3 slaked lime. 2 / g of slaked lime is prepared, which is much higher than similar products currently sold on the market. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 The present invention is a flow chart of the preparation method. DETAILED DESCRIPTION
[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.
[0021] Example 1 Effect of the mass ratio of sodium bicarbonate and water on the specific surface area of the prepared high specific surface area slaked lime
[0022] Sodium bicarbonate and water are mixed according to mass ratios of 0.025:100, 0.03:100, 0.04:100, 0.05:100, 1.15:100, 2.25:100, 2.5:100, 2.75:100, and 3:100, and stirred until the sodium bicarbonate is completely dissolved to obtain a sodium bicarbonate aqueous solution. Ingredients 1, 2, and 3 are respectively mixed into the sodium bicarbonate aqueous solution according to a solid-liquid ratio of 2:100 g / mL, 5:100 g / mL, and 0.25:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is glycerol; ingredient 2 is dimethylformamide; and ingredient 3 is cyclodextrin. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 0.25 hours and the low-temperature plasma action voltage is 5 kV.
[0023] Preparation of high specific surface area slaked lime: Weigh the additive liquid and quicklime at a liquid-to-solid ratio of 50 mL:100 g, respectively. Stir the quicklime continuously, add the additive liquid while stirring, and stir for 30 minutes to obtain a high specific surface area slaked lime sample.
[0024] Specific surface area test of slaked lime: The specific surface area of slaked lime samples was tested and determined in accordance with the "Determination of Specific Surface Area of Solid Substances by Gas Adsorption BET Method" (GB / T19587-2017).
[0025] The test results of the embodiments of the present invention are shown in Table 1.
[0026] Table 1 Effect of the mass ratio of sodium bicarbonate and water on the specific surface area of the prepared high specific surface area slaked lime
[0027] Sodium bicarbonate and water mass ratio <![CDATA[Specific surface area (m 2 / g)]]> Relative error percentage 0.025:100 27.51 ±0.1％ 0.03:100 34.28 ±0.2％ 0.04:100 41.07 ±0.1％ 0.05:100 46.75 ±0.1％ 1.15:100 47.54 ±0.1％ 2.25:100 50.13 ±0.1％ 2.5:100 45.49 ±0.1％ 2.75:100 40.62 ±0.1％ 3:100 32.96 ±0.2％
[0028] It can be seen from Table 1 that when the mass ratio of sodium bicarbonate to water is less than 0.05:100 (such as in Table 1, the mass ratio of sodium bicarbonate to water = 0.04:100, 0.03:100, 0.025:100 and lower ratios not listed in Table 1), the amount of sodium bicarbonate added is small, the concentration of the sodium bicarbonate aqueous solution is low, and the digestion reaction is insufficient, resulting in the specific surface area of the prepared high specific surface area slaked lime being significantly reduced as the mass ratio of sodium bicarbonate to water decreases. When the mass ratio of sodium bicarbonate to water is equal to 0.05-2.25:100 (such as in Table 1, the mass ratio of sodium bicarbonate to water = 0.05:100, 1.15:100, 2.25), during the digestion reaction, sodium bicarbonate is decomposed by heat to produce carbon dioxide gas, thereby causing the bubble to suspend and diffuse, stirring the reaction. Finally, the specific surface area of the prepared high specific surface area slaked lime is greater than 46m 2 / g. When the mass ratio of sodium bicarbonate to water is greater than 2.25:100 (such as in Table 1, the mass ratio of sodium bicarbonate to water = 2.5:100, 2.75:100, 3:100 and higher ratios not listed in Table 1), excessive sodium bicarbonate is added, the concentration of the sodium bicarbonate aqueous solution is too high, the decomposition is too fast, and the sodium carbonate residue in the prepared slaked lime is too high, resulting in the specific surface area of the prepared high specific surface area slaked lime being significantly reduced with the further increase of the mass ratio of sodium bicarbonate to water. In general, considering the benefits and costs, when the mass ratio of sodium bicarbonate to water is equal to 0.05-2.25:100, the prepared additive is most conducive to improving the specific surface area of the slaked lime sample.
[0029] Example 2 Effect of the solid-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution on the specific surface area of the prepared high specific surface area slaked lime
[0030] Sodium bicarbonate and water are mixed at a mass ratio of 2.25:100, and stirred until the sodium bicarbonate is completely dissolved to obtain a sodium bicarbonate aqueous solution. Ingredients 1 and 2 are respectively mixed into the sodium bicarbonate aqueous solution at a solid-liquid ratio of 6:100 g / mL and 3:100 g / mL, and then ingredient 3 is mixed into the sodium bicarbonate aqueous solution at a solid-liquid ratio of 0.1:100 g / mL, 0.15:100 g / mL, 0.2:100 g / mL, 0.25:100 g / mL, 1.5:100 g / mL, 2.75:100 g / mL, 3:100 g / mL, 3.25:100 g / mL, and 3.5:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is butanetriol; ingredient 2 is diethylacetamide; and ingredient 3 is cycloheptose. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 2.25 hours and the low-temperature plasma action voltage is 40 kV.
[0031] Preparation of high specific surface area slaked lime: Weigh the additive liquid and quicklime at a liquid-to-solid ratio of 60 mL:100 g, respectively. Stir the quicklime continuously, add the additive liquid while stirring, and stir for 30 minutes to obtain a high specific surface area slaked lime sample.
[0032] The specific surface area of slaked lime was tested in the same manner as in Example 1. The test results of the embodiments of the present invention are shown in Table 2.
[0033] Table 2 Effect of solid-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution on the specific surface area of prepared high specific surface area slaked lime
[0034]
[0035]
[0036] It can be seen from Table 2 that when the solid-liquid ratio of ingredient 3 and the sodium bicarbonate aqueous solution is less than 0.25:100 g / mL (as in Table 2, the solid-liquid ratio of ingredient 3 and the sodium bicarbonate aqueous solution = 0.2:100 g / mL, 0.15:100 g / mL, 0.1:100 g / mL and lower ratios not listed in Table 2), the amount of ingredient 3 added is small, and the mixed product formed after low-temperature plasma irradiation has poor controllability on the digestion reaction, resulting in the specific surface area of the prepared high specific surface area slaked lime being significantly reduced as the solid-liquid ratio of ingredient 3 and the sodium bicarbonate aqueous solution decreases. When the solid-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution is equal to 0.25-2.75:100 g / mL (such as in Table 2, the solid-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution = 0.25:100 g / mL, 1.5:100 g / mL, 2.75:100 g / mL), the mixed materials in the additive and the mixed products formed by low-temperature plasma irradiation can effectively control the heat and mass transfer process of the reaction between CaO and H2O through attachment and potential adjustment, which is conducive to the preparation of high specific surface slaked lime. Finally, the prepared high specific surface slaked lime has a specific surface area greater than 50m 2 / g. When the solid-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution is greater than 2.75:100 g / mL (as in Table 2, the solid-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution = 3:100 g / mL, 3.25:100 g / mL, 3.5:100 g / mL and higher ratios not listed in Table 2), ingredient 3 is added in excess, and the mixed product formed after low-temperature plasma irradiation has poor controllability over the digestion reaction, resulting in the specific surface area of the prepared high specific surface area slaked lime being significantly reduced as the solid-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution further increases.
[0037] In general, considering the benefits and costs, when the solid-to-liquid ratio of ingredient 3 and sodium bicarbonate aqueous solution is equal to 0.25-2.75:100 g / mL, the prepared additive is most beneficial to improving the specific surface area of slaked lime samples.
[0038] Example 3 Effect of low temperature plasma action time on the specific surface area of prepared high specific surface area slaked lime
[0039] Sodium bicarbonate and water are mixed in a mass ratio of 2.25:100, and stirred until the sodium bicarbonate is completely dissolved to obtain a sodium bicarbonate aqueous solution. Ingredients 1, 2, and 3 are respectively mixed into the sodium bicarbonate aqueous solution in a solid-liquid ratio of 10:100 g / mL, 1:100 g / mL, and 2.75:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is polycaprolactone triol; ingredient 2 is dimethyl sulfoxide; ingredient 3 is cyclooctose. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 0.1 hour, 0.15 hour, 0.2 hour, 0.25 hour, 2.25 hour, 4.25 hour, 4.5 hour, 4.75 hour, and 5 hour, and the low-temperature plasma action voltage is 75 kV.
[0040] Preparation of high specific surface area slaked lime: Weigh the additive liquid and quicklime at a liquid-to-solid ratio of 70 mL:100 g, respectively. Stir the quicklime continuously, add the additive liquid while stirring, and stir for 30 minutes to obtain a high specific surface area slaked lime sample.
[0041] The specific surface area of slaked lime was tested in the same manner as in Example 1. The test results of the embodiments of the present invention are shown in Table 3.
[0042] Table 3 Effect of low temperature plasma action time on the specific surface area of prepared high specific surface area slaked lime
[0043]
[0044]
[0045] It can be seen from Table 3 that when the low-temperature plasma action time is less than 0.25 hours (such as in Table 3, the low-temperature plasma action time = 0.2 hours, 0.15 hours, 0.1 hours and lower values not listed in Table 3), the low-temperature plasma irradiation time is short, and the mixed product formed after the low-temperature plasma irradiation has poor controllability over the digestion reaction, resulting in the specific surface area of the prepared high specific surface area slaked lime being significantly reduced as the low-temperature plasma action time decreases. When the low-temperature plasma action time is equal to 0.25 to 4.25 hours (such as in Table 3, the low-temperature plasma action time = 0.25 hours, 2.25 hours, 4.25 hours), the mixed materials in the additive and the mixed products formed by the low-temperature plasma irradiation can effectively control the heat and mass transfer process of the reaction between CaO and H2O through attachment, encapsulation and potential adjustment, thereby facilitating the preparation of high specific surface area slaked lime. Finally, the specific surface area of the prepared high specific surface area slaked lime is greater than 53m 2When the low-temperature plasma action time is greater than 4.25 hours (such as in Table 3, the low-temperature plasma action time = 4.5 hours, 4.75 hours, 5 hours and higher values not listed in Table 3), the low-temperature plasma irradiation time is too long, and the mixed product formed after the low-temperature plasma irradiation has poor controllability on the digestion reaction, resulting in a significant decrease in the specific surface area of the prepared high specific surface area slaked lime as the low-temperature plasma irradiation time further increases.
[0046] In general, considering the benefits and costs, when the low-temperature plasma action time is equal to 0.25 to 4.25 hours, the prepared additive is most beneficial to improving the specific surface area of slaked lime samples.
[0047] Example 4 Effect of the Type of Ingredient 1 on the Specific Surface Area of the Prepared High Specific Surface Area Hydrated Lime
[0048] Sodium bicarbonate and water are mixed at a mass ratio of 2.25:100, and stirred until the sodium bicarbonate is completely dissolved to obtain a sodium bicarbonate aqueous solution. Ingredients 1, 2, and 3 are respectively mixed into the sodium bicarbonate aqueous solution at a solid-liquid ratio of 6:100 g / mL, 3:100 g / mL, and 1.5:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is any one of propylene glycol, butanetriol, polycaprolactone triol, polyether triol, trimethylolpropane, and trimethylolethane; ingredient 2 is N-methylpyrrolidone; ingredient 3 is maltose. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 2.25 hours, and the low-temperature plasma action voltage is 40 kV.
[0049] The preparation of high specific surface area slaked lime is the same as in Example 2, and the specific surface area of slaked lime is detected the same as in Example 1. The test results of the embodiments of the present invention are shown in Table 4.
[0050] Table 4 Effect of the type of ingredient 1 on the specific surface area of the prepared high specific surface area slaked lime
[0051] Ingredients 1 type <![CDATA[Specific surface area (m 2 / g)]]> Relative error percentage Glycerol 52.34 ±0.1％ Butanetriol 53.08 ±0.2％ Polycaprolactone triol 53.19 ±0.1％ Polyether triol 52.96 ±0.1％ Trimethylolpropane 52.47 ±0.1％ Trimethylolethane 53.51 ±0.1％
[0052] It can be seen from Table 4 that when ingredient 1 is any one of propylene glycol, butanetriol, polycaprolactone triol, polyether triol, trimethylolpropane, and trimethylolethane, there is no significant difference in the specific surface area data of slaked lime achieved by the prepared additives.
[0053] Example 5 Effect of three types of ingredients on the specific surface area of the prepared high specific surface area slaked lime
[0054] Sodium bicarbonate and water are mixed at a mass ratio of 1.15:100, and stirred until the sodium bicarbonate is completely dissolved to obtain a sodium bicarbonate aqueous solution. Ingredients 1, 2, and 3 are respectively mixed into the sodium bicarbonate aqueous solution at a solid-liquid ratio of 6:100 g / mL, 3:100 g / mL, and 1.5:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is trimethylolethane; ingredient 2 is ethyl lactate; ingredient 3 is any one of cyclodextrin, cycloheptose, cyclooctose, maltose, trehalose, cyclopentose, and cyclohexose. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 2.25 hours, and the low-temperature plasma action voltage is 40 kV.
[0055] The preparation of high specific surface area slaked lime is the same as in Example 2, and the specific surface area of slaked lime is detected the same as in Example 1. The test results of the embodiments of the present invention are shown in Table 5.
[0056] Table 5 Effect of three types of ingredients on the specific surface area of prepared high specific surface area slaked lime
[0057]
[0058]
[0059] It can be seen from Table 5 that when ingredient 3 is any one of cyclodextrin, cycloheptose, cyclooctose, maltose, trehalose, cyclopentose and cyclohexose, there is no significant difference in the specific surface area data of slaked lime achieved by the prepared additives.
[0060] Comparative Example Effect of Different Comparative Processes on the Specific Surface Area of High Specific Surface Area Hydrated Lime
[0061] The process of the present invention comprises mixing sodium bicarbonate and water at a mass ratio of 1.15:100, stirring until the sodium bicarbonate is completely dissolved, and obtaining a sodium bicarbonate aqueous solution. Ingredients 1, 2, and 3 are respectively mixed into the sodium bicarbonate aqueous solution at a solid-liquid ratio of 6:100 g / mL, 3:100 g / mL, and 1.5:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is trimethylolethane; ingredient 2 is ethyl lactate; and ingredient 3 is cyclohexose. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 2.25 hours, and the low-temperature plasma action voltage is 40 kV.
[0062] Comparative process 1: Sodium bicarbonate and water are mixed at a mass ratio of 1.15:100, and stirred until the sodium bicarbonate is completely dissolved to obtain a sodium bicarbonate aqueous solution. Ingredients 1 and 2 are respectively mixed into the sodium bicarbonate aqueous solution at a solid-liquid ratio of 6:100 g / mL and 3:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is trimethylolethane; ingredient 2 is ethyl lactate. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 2.25 hours and the low-temperature plasma action voltage is 40 kV.
[0063] Comparative process 2: Sodium bicarbonate and water are mixed at a mass ratio of 1.15:100, and stirred until the sodium bicarbonate is completely dissolved to obtain a sodium bicarbonate aqueous solution. Ingredients 1 and 3 are respectively mixed into the sodium bicarbonate aqueous solution at a solid-liquid ratio of 6:100 g / mL and 1.5:100 g / mL, and stirred evenly to obtain an initial slurry, wherein ingredient 1 is trimethylolethane; ingredient 3 is cyclohexose. The initial slurry is activated by low-temperature plasma to obtain an additive for quicklime digestion, wherein the low-temperature plasma action time is 2.25 hours and the low-temperature plasma action voltage is 40 kV.
[0064] The preparation of high specific surface area slaked lime is the same as in Example 2, and the specific surface area of slaked lime is detected the same as in Example 1. The test results of the embodiments of the present invention are shown in Table 6.
[0065] Table 6 Effect of different comparative processes on the specific surface area of prepared high specific surface area slaked lime
[0066]
[0067]
[0068] It can be seen from Table 6 that the specific surface area of the high specific surface area slaked lime prepared by the process of the present invention is significantly higher than that of the comparative process 1 and the comparative process 2, and higher than the sum of the two.
Claims
1. A method for preparing an additive for preparing high specific surface area slaked lime, characterized in that: The following steps are involved: Ingredients 1, 2 and 3 are mixed into a sodium bicarbonate aqueous solution, stirred evenly, and activated by low-temperature plasma to obtain the additive; ingredient 1 comprises one or more of propylene glycol, butanetriol, polycaprolactone triol, polyether triol, trimethylolpropane or trimethylolethane; ingredient 2 comprises one or more of dimethylformamide, diethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone or ethyl lactate; ingredient 3 comprises one or more of cyclodextrin, cycloheptose, cyclooctose, maltose, trehalose, cyclopentose or cyclohexose.
2. The preparation method according to claim 1, characterized in that: The mass ratio of sodium bicarbonate to water in the sodium bicarbonate aqueous solution is 0.05-2.25:
100.
3. The preparation method according to claim 1, characterized in that: The solid-to-liquid ratio of the sodium bicarbonate aqueous solution to ingredient 1 is 2-10:100 g / mL.
4. The preparation method according to claim 1, characterized in that: The solid-to-liquid ratio of the sodium bicarbonate aqueous solution to ingredient 2 is 1-5:100 g / mL.
5. The preparation method according to claim 1, characterized in that: The solid-to-liquid ratio of the sodium bicarbonate aqueous solution to ingredient 3 is 0.25-2.75:100 g / mL.
6. The preparation method according to claim 1, characterized in that: The low-temperature plasma action time is 0.25 to 4.25 hours.
7. The preparation method according to claim 1, characterized in that: The action voltage of the low-temperature plasma is 5 to 75 kV.
8. An additive prepared by the preparation method according to any one of claims 1 to 7.
9. Use of the additive according to claim 8 in the preparation of high specific surface area slaked lime.