Modifier, method for improving dispersibility of coal gasification slag and application of modifier
By using combination modifiers such as betaine surfactant, alkylphenol polyoxyethylene ether phosphate and cationic surfactant, the dispersion and stability of the coal gasification slag are improved, and its dispersion in building materials is solved. The problem of low compressive strength has achieved more efficient utilization of coal gasification slag and improvement of building materials performance.
Patent Information
- Application Number
- CN202411310837.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2024-12-27
AI Technical Summary
The poor dispersion of coal gasification slag in building materials leads to low compressive strength when preparing cement or concrete, and cannot be directly used for boiler combustion, which poses environmental threats.
Using a modifier, including betaine surfactant, alkylphenol polyoxyethylene ether phosphate, cationic surfactant, lignin sulfonate and stabilizer, improved by diluting into aqueous solution and mixing with coal gasification slag Its dispersion and stability in water enable it to be evenly dispersed in cement or concrete.
It effectively reduces the contact angle between coal gasification slag and water, so that it no longer accumulates, improves the dispersion and compressive strength in cement and concrete, enhances the utilization efficiency of coal gasification slag, and reduces the hardening of cement and concrete. The intensity of the effect.
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Figure CN119191745A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of polymer compound compositions and relates to a modifier and a method and application of improving the dispersibility of coal gasification slag. Background Art
[0002] Coal gasification technology provides synthesis gas for the entire back-end chemical production, but a large amount of coal gasification slag will inevitably be produced during the coal gasification process. At present, the output of coal gasification slag is large, the utilization rate is low, the processing cost is high and there is an environmental threat. Storage and landfill are still the main disposal methods for coal gasification slag. Coal gasification slag cannot be directly used in cement and concrete due to its high carbon content. In addition, although coal gasification slag has a certain calorific value, it does not meet the boiler combustion requirements due to its high moisture content, many impurities and low carbon content, and cannot be directly used for blending in large quantities. The application of coal gasification slag in building materials mainly includes the preparation of cement, concrete fillers, ceramsite, wall materials and bricks, among which the preparation of cement and concrete is an important way to consume coal gasification slag on a large scale. The loss on ignition of coal gasification slag is high and has exceeded national and industry standards. The residual carbon is an inert substance. The high residual carbon content inhibits the gelling reaction between coal gasification slag and cement or lime, hinders the growth of the gel and crystal of the hydrate to connect with each other, and reduces the frost resistance and strength of concrete. In addition, coal gasification slag contains a certain amount of residual carbon, has a loose and porous structure, rich porous structure and a large specific surface area, so that its contact angle with water is usually >90°, resulting in poor dispersibility and easy agglomeration when coal gasification slag is used to prepare cement or concrete, which affects its compressive strength when used to prepare building materials. Therefore, there is an urgent need for a modifier that can effectively improve the dispersibility of coal gasification slag. Summary of the invention
[0003] The object of the present invention is to solve at least one of the above-mentioned technical problems. By using it, coal gasification slag can be better used for the preparation of building materials in a simple and cost-effective manner. To this end, the present invention provides a modifier and a method and application for improving the dispersibility of coal gasification slag to solve this need in the art.
[0004] On the one hand, the present invention provides a modifier, which includes 1 part of betaine surfactant, 1-4 parts of alkylphenol polyoxyethylene ether phosphate, 1-2 parts of cationic surfactant, 1-3 parts of lignin sulfonate, and 1-1.5 parts of stabilizer, calculated by weight.
[0005] Furthermore, in the modifier provided by the present invention, the betaine surfactant is at least one of dodecyl betaine, hexadecyl betaine and octadecyl betaine.
[0006] Furthermore, in the modifier provided by the present invention, the alkylphenol polyoxyethylene ether phosphate is at least one of APE-4P, APE-6P, APE-8P, and APE-10P.
[0007] Further, in the modifier provided by the present invention, the cationic surfactant is at least one of dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride, dodecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium bromide, dodecyldimethylbenzylammonium chloride, hexadecyldimethylbenzylammonium chloride, octadecyldimethylbenzylammonium chloride, dodecyldimethylbenzylammonium bromide, hexadecyldimethylbenzylammonium bromide and octadecyldimethylbenzylammonium bromide.
[0008] Furthermore, in the modifier provided by the present invention, the lignin sulfonate is at least one of sodium lignin sulfonate and calcium lignin sulfonate.
[0009] Furthermore, in the modifier provided by the present invention, the stabilizer is at least one of polyvinyl alcohol, polyvinyl pyrrolidone, and partially hydrolyzed polyacrylamide with a hydrolysis degree of 30% to 50% and a molecular weight of more than 8 million.
[0010] On the other hand, the present invention provides a method for improving the dispersibility of coal gasification slag, comprising: diluting the modifier with water having a total calcium and magnesium ion content of no more than 500 mg / L to form an aqueous solution with a mass concentration of 0.3% to 1.5%, and then adding 10% to 30% of the mass of the aqueous solution to mix the coal gasification slag.
[0011] In another aspect, the present invention provides modified coal gasification slag prepared by the method.
[0012] On the other hand, the present invention provides use of the modified coal gasification slag in preparing building materials, wherein the modified coal gasification slag is used to improve the compressive strength of the building materials.
[0013] Furthermore, in the application provided by the present invention, the building material is cement or concrete.
[0014] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects or advantages.
[0015] The present invention verifies that when betaine surfactant, alkylphenol polyoxyethylene ether phosphate and cationic surfactant are used to modify coal gasification slag, each component cooperates to modify it to be water-wetted, and the contact angle with water is adjusted from >90° to <30°, so that it does not aggregate in water. The present invention further uses lignin sulfonate to enhance the dispersibility of gasification slag powder; and then utilizes the thickening effect of polymer stabilizer to strengthen the stability of coal gasification slag powder in water, so that it is evenly dispersed in cement or concrete after mixing, and does not aggregate into agglomerates. The present invention solves the technical problem of the dispersibility of coal gasification slag in cement and concrete, enhances the utilization efficiency of coal gasification slag in cement and concrete, and reduces the influence on the strength of cement and concrete after hardening. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The contact angle pictures of coal gasification slag and water before and after modification of test group 3, A is before modification of coal gasification slag, B is after modification of coal gasification slag;
[0017] Figure 2 The contact angle pictures of coal gasification slag and water before and after modification of test group 8, A is before modification of coal gasification slag, B is after modification of coal gasification slag;
[0018] Figure 3 The contact angle pictures of coal gasification slag and water before and after modification of test group 10, A is before modification of coal gasification slag, B is after modification of coal gasification slag;
[0019] Figure 4 The contact angle pictures of coal gasification slag and water before and after modification of test group 13, A is before modification of coal gasification slag, B is after modification of coal gasification slag;
[0020] Figure 5 These are the contact angle pictures of coal gasification slag and water before and after improvement of test group 14, A is the coal gasification slag before modification, and B is the coal gasification slag after modification. DETAILED DESCRIPTION
[0021] The present invention is described in detail below in conjunction with the accompanying drawings and specific examples, but should not be construed as limiting the present invention. Unless otherwise specified, the technical means used in the following examples are conventional means well known to those skilled in the art, and the materials, reagents, etc. used in the following examples, unless otherwise specified, can be obtained from commercial sources.
[0022] Example 1
[0023] This embodiment provides a method for preparing a modifier.
[0024] Betaine surfactant, lignin sulfonate, alkylphenol polyoxyethylene ether phosphate, cationic surfactant and stabilizer are taken in a mass ratio of 1:1-3:1-4:1-2:1-1.5.
[0025] At room temperature, 1 part by weight of betaine surfactant is dissolved in 15-30 parts by weight of water, then 1-3 parts by weight of lignin sulfonate is added, then 1-4 parts by weight of alkylphenol polyoxyethylene ether phosphate is added, then 1-2 parts by weight of cationic surfactant is added, and finally 1-1.5 parts by weight of stabilizer is added. During the preparation process, raw materials are added while stirring, and the next raw material is added after the previous raw material is completely dissolved or evenly dispersed, until a uniform liquid is formed.
[0026] When in use, the above-mentioned liquid medicine is diluted with water to a mass concentration of 0.3% to 1.5% at room temperature, and then 10% to 30% of the mass ratio of coal gasification slag to the aqueous solution is added, and stirred until uniform, and then stirred for more than 2 hours, and mixed with cement or concrete in a mass ratio of 2 to 5:1.
[0027] The water used in the above preparation process is water with a total calcium and magnesium ion content not exceeding 500 mg / L, such as river water, lake water, well water, tap water or ultrapure water.
[0028] Example 2
[0029] The coal gasification slag used in this embodiment was sourced from Sinopec Ningbo Technology Research Institute Co., Ltd., and the cement was purchased from Qingyun Kangjing Building Materials Co., Ltd.
[0030] Different modifiers, cements and concretes were prepared according to the formula shown in Table 1 and the preparation steps shown in Example 1.
[0031] Table 1: Modifier formula
[0032]
[0033]
[0034]
[0035] Test group 1: Modifier 1 was diluted to a mass concentration of 0.3%, and then 10% of the mass ratio of coal gasification slag to the aqueous solution was added, and stirred until uniform, and then stirred for 6 hours, and mixed with cement at a mass ratio of 3:1.
[0036] Test group 2: Modifier 2 was diluted to a mass concentration of 0.5%, and then 15% of the mass ratio of coal gasification slag to the aqueous solution was added, and stirring was continued until uniform, and then stirring was continued for 5 hours, and then mixed with concrete at a mass ratio of 2.5:1.
[0037] Test group 3: Modifier 3 was diluted to a mass concentration of 0.6%, and then 20% of the mass ratio of coal gasification slag to the aqueous solution was added, and stirring was continued until uniform, and then stirring was continued for 4 hours, and then mixed with cement at a mass ratio of 4:1.
[0038] Test group 4: Modifier 4 was diluted to a mass concentration of 0.8%, and then 25% of the mass ratio of coal gasification slag to the aqueous solution was added, and stirring was continued until uniform, and then stirring was continued for 4.5 hours, and then mixed with concrete at a mass ratio of 5:1.
[0039] Test group 5: Modifier 5 was diluted to a mass concentration of 1.5%, and then 30% of the mass ratio of coal gasification slag to the aqueous solution was added, and stirred until uniform, and then stirred for 6 hours, and mixed with concrete at a mass ratio of 3.5:1.
[0040] Test group 6: Modifier 6 was diluted to a mass concentration of 1.0%, and then 20% of the mass ratio of coal gasification slag to the aqueous solution was added, and stirring was continued until uniform, and then stirring was continued for 4 hours, and then mixed with cement at a mass ratio of 2.5:1.
[0041] Test group 7: Same as test group 1, except that no lignin sulfonate and stabilizer were added.
[0042] Test Group 8: Same as Test Group 2, except that no lignin sulfonate and stabilizer were added.
[0043] Test group 9: Same as test group 3, except that no lignin sulfonate and stabilizer were added.
[0044] Test group 10: Same as test group 4, except that no stabilizer was added.
[0045] Test Group 11: Same as Test Group 5, except that the betaine surfactant was replaced with disodium lauryl sulfosuccinate (other type of surfactant).
[0046] Test Group 12: Same as Test Group 6, except that the total calcium and magnesium ion content in the water used was 1000 mg / L.
[0047] Test group 13: Same as test group 5, except that no modifier was added.
[0048] Test group 14: Same as test group 6, except that no modifier was added.
[0049] The contact angle between coal gasification slag and water is measured by a contact angle meter, and the compressive strength of cement or concrete is measured by a compression test.
[0050] The test results are as follows Figure 1-Figure 5 And as shown in Table 2.
[0051] Table 2: Properties of modified coal gasification slag and cement or concrete
[0052]
[0053] In addition, in test group 1, the contact angle between the surface of coal gasification slag and water was adjusted from 116° to 66° by using betaine surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 116° to 36° by using alkylphenol polyoxyethylene ether phosphate alone; the contact angle between the surface of coal gasification slag and water was adjusted from 116° to 41° by using cationic surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 116° to 27° by using betaine surfactant and alkylphenol polyoxyethylene ether phosphate together; the contact angle between the surface of coal gasification slag and water was adjusted from 116° to 34° by using betaine surfactant and cationic surfactant together; the contact angle between the surface of coal gasification slag and water was adjusted from 116° to 26° by using alkylphenol polyoxyethylene ether phosphate and cationic surfactant together. The synergistic cooperation of each component adjusted the contact angle between the surface of coal gasification slag and water from 116° to 11°.
[0054] In addition, in test group 2, the contact angle between the surface of coal gasification slag and water was adjusted from 109° to 61° by using betaine surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 109° to 32° by using alkylphenol polyoxyethylene ether phosphate alone; the contact angle between the surface of coal gasification slag and water was adjusted from 109° to 37° by using cationic surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 109° to 29° by using betaine surfactant and alkylphenol polyoxyethylene ether phosphate together; the contact angle between the surface of coal gasification slag and water was adjusted from 109° to 32° by using betaine surfactant and cationic surfactant together; the contact angle between the surface of coal gasification slag and water was adjusted from 109° to 25° by using alkylphenol polyoxyethylene ether phosphate and cationic surfactant together. The synergistic cooperation of each component adjusted the contact angle between the surface of coal gasification slag and water from 109° to 17°.
[0055] In addition, in test group 3, the contact angle between the surface of coal gasification slag and water was adjusted from 112° to 63° by using betaine surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 112° to 36° by using alkylphenol polyoxyethylene ether phosphate alone; the contact angle between the surface of coal gasification slag and water was adjusted from 112° to 39° by using cationic surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 112° to 37° by using betaine surfactant and alkylphenol polyoxyethylene ether phosphate together; the contact angle between the surface of coal gasification slag and water was adjusted from 112° to 43° by using betaine surfactant and cationic surfactant together; the contact angle between the surface of coal gasification slag and water was adjusted from 112° to 34° by using alkylphenol polyoxyethylene ether phosphate and cationic surfactant together. The synergistic cooperation of each component adjusted the contact angle between the surface of coal gasification slag and water from 112° to 14°.
[0056] In addition, in test group 4, the contact angle between the surface of coal gasification slag and water was adjusted from 97° to 55° by using betaine surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 97° to 30° by using alkylphenol polyoxyethylene ether phosphate alone; the contact angle between the surface of coal gasification slag and water was adjusted from 97° to 31° by using cationic surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 97° to 26° by using betaine surfactant and alkylphenol polyoxyethylene ether phosphate together; the contact angle between the surface of coal gasification slag and water was adjusted from 97° to 29° by using betaine surfactant and cationic surfactant together; the contact angle between the surface of coal gasification slag and water was adjusted from 97° to 25° by using alkylphenol polyoxyethylene ether phosphate and cationic surfactant together. The synergistic cooperation of each component adjusted the contact angle between the surface of coal gasification slag and water from 97° to 13°.
[0057] In addition, in test group 5, the contact angle between the surface of coal gasification slag and water was adjusted from 113° to 62° by using betaine surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 113° to 31° by using alkylphenol polyoxyethylene ether phosphate alone; the contact angle between the surface of coal gasification slag and water was adjusted from 113° to 34° by using cationic surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 113° to 28° by using betaine surfactant and alkylphenol polyoxyethylene ether phosphate together; the contact angle between the surface of coal gasification slag and water was adjusted from 113° to 31° by using betaine surfactant and cationic surfactant together; the contact angle between the surface of coal gasification slag and water was adjusted from 113° to 29° by using alkylphenol polyoxyethylene ether phosphate and cationic surfactant together. The synergistic cooperation of each component adjusted the contact angle between the surface of coal gasification slag and water from 113° to 18°.
[0058] In addition, in test group 6, the contact angle between the surface of coal gasification slag and water was adjusted from 92° to 51° by using betaine surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 92° to 37° by using alkylphenol polyoxyethylene ether phosphate alone; the contact angle between the surface of coal gasification slag and water was adjusted from 92° to 33° by using cationic surfactant alone; the contact angle between the surface of coal gasification slag and water was adjusted from 92° to 29° by using betaine surfactant and alkylphenol polyoxyethylene ether phosphate together; the contact angle between the surface of coal gasification slag and water was adjusted from 92° to 26° by using betaine surfactant and cationic surfactant together; the contact angle between the surface of coal gasification slag and water was adjusted from 92° to 24° by using alkylphenol polyoxyethylene ether phosphate and cationic surfactant together. The synergistic cooperation of each component adjusted the contact angle between the surface of coal gasification slag and water from 92° to 8°.
[0059] As can be seen from Table 2 and the above results, the present invention provides a modifier composed of a betaine surfactant, an alkylphenol polyoxyethylene ether phosphate and a cationic surfactant to address the problem of poor dispersibility of coal gasification slag in water. The above modifier can effectively adjust the contact angle between the surface of the coal gasification slag and water from >90° to <30°, so that it does not aggregate in water. The modifier composed of a betaine surfactant, an alkylphenol polyoxyethylene ether phosphate and a cationic surfactant provided by the present invention has a higher effect on reducing the contact angle between the surface of the coal gasification slag and water than any one or two components thereof, and changing or replacing other surfactants has no improvement effect. In addition to the composition of the betaine surfactant, the alkylphenol polyoxyethylene ether phosphate and the cationic surfactant, the present invention further improves the effect of the coal gasification slag on the strength of building materials such as concrete or cement.
[0060] It should be noted that when the claims of the present invention involve numerical ranges, it should be understood that the two endpoints of each numerical range and any numerical value between the two endpoints can be selected. In order to avoid redundancy, the present invention describes a preferred embodiment.
[0061] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.
[0062] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A modifier for improving the dispersibility of coal gasification slag, characterized in that: The composition includes 1 part of betaine surfactant, 1-4 parts of alkylphenol polyoxyethylene ether phosphate, 1-2 parts of cationic surfactant, 1-3 parts of lignin sulfonate and 1-1.5 parts of stabilizer by weight.
2. The modifier according to claim 1, characterized in that The betaine surfactant is at least one of dodecyl betaine, hexadecyl betaine and octadecyl betaine.
3. The modifier according to claim 1, characterized in that The alkylphenol polyoxyethylene ether phosphate is at least one of APE-4P, APE-6P, APE-8P and APE-10P.
4. The modifier according to claim 1, characterized in that The cationic surfactant is at least one of dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, hexadecyltrimethylammonium chloride, octadecyltrimethylammonium chloride, dodecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, hexadecyltrimethylammonium bromide, octadecyltrimethylammonium bromide, dodecyldimethylbenzylammonium chloride, hexadecyldimethylbenzylammonium chloride, octadecyldimethylbenzylammonium chloride, dodecyldimethylbenzylammonium bromide, hexadecyldimethylbenzylammonium bromide and octadecyldimethylbenzylammonium bromide.
5. The modifier according to claim 1, characterized in that The lignin sulfonate is at least one of sodium lignin sulfonate and calcium lignin sulfonate.
6. The modifying agent according to claim 1, characterized in that The stabilizer is at least one of polyvinyl alcohol, polyvinyl pyrrolidone, and polyacrylamide with a hydrolysis degree of 30% to 50% and a molecular weight of more than 8 million.
7. A method for improving the dispersibility of coal gasification slag, characterized in that: include: The modifier according to any one of claims 1 to 6 is diluted with water having a total calcium and magnesium ion content not exceeding 500 mg / L to form an aqueous solution with a mass concentration of 0.3% to 1.5%, and then 10% to 30% of the mass of the aqueous solution of coal gasification slag is added and mixed.
8. Modified coal gasification slag prepared by the method of claim 7.
9. The use of the modified coal gasification slag according to claim 8 in the preparation of building materials, characterized in that: The modified coal gasification slag is used to improve the compressive strength of building materials.
10. The use according to claim 9, characterized in that: The building material is cement or concrete.