Fluorine removal agent composition and preparation method thereof

Abstract

The invention provides a fluorine removal agent composition and a preparation method thereof, and belongs to the technical field of fluorine removal agents. The invention aims to improve the fluorine removal efficiency of the polyaluminum chloride, and designs a compound formula with a synergistic effect for the polyaluminum chloride. According to the composition, aluminum polychlorid is used as a main component, bentonite is adopted for achieving the dispersing and thickening effects, the composition is in a suspension and gel state in water, and contact between fluorine ions and a fluorine removal agent is promoted; meanwhile, diatomite is adopted as an adsorbent, so that the removal effect of fluorine ions is improved. As a surfactant, sodium citrate can form an emulsion in water to remove part of pollutants and relieve the influence of the pollutants on the fluorine removal process. In addition, diethylenetriamine pentaacetate, polydimethylsiloxane, lanthanum nitrate and other components are added and cooperate with polyaluminum chloride, and the fluorine removal effect is fully improved. In the aspect of the preparation method, a compounding scheme is designed according to physical characteristics of different components, and the method has low requirements on equipment and has high process efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of defluorination agents, and specifically relates to a defluorination agent composition and a preparation method thereof. Background Art

[0002] Fluoride ions are a common water pollutant that affects the taste, smell and color of water, and can also have adverse effects on human health. Defluoridation agents are chemical agents used in water treatment, mainly used to remove fluoride ions from water. The function of defluoridation agents is to remove fluoride ions from water by forming insoluble salt precipitation with fluoride ions. Commonly used defluoridation agents are metal salts, such as aluminum salts and magnesium salts. These metal salts can form crystals with fluoride ions, thereby quickly precipitating and removing them.

[0003] The principle of fluorine removal by fluorine removal agent is to use inorganic coagulants to form chemical reaction precipitation with fluorine ions, thereby removing fluorine ions. Commonly used coagulants are as follows: Inorganic flocculants: polyaluminium chloride PAC, polyferric sulfate, ferrous sulfate, aluminium sulfate, aluminium chloride, polysilicate, magnesium chloride, potassium ferrate, etc. Organic flocculants: polyacrylamide PAM, chitosan flocculant, cationic polyamine, cationic dicyandiamide polymer, sodium alginate, polydimethylammonium chloride, etc. Coagulation defluorination agent has low cost and ideal effect, and is widely used to treat fluorine-containing wastewater. With the strict fluorine ion emission standards, it is difficult for a single coagulant to meet the extremely low fluorine ion standard requirements, and compound defluorination agents have come into being. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to further improve the defluorination efficiency of the defluorination agent.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A defluoridation agent composition comprises the following components in parts by weight: 18-20 parts of polyaluminium chloride, 2-3 parts of diatomaceous earth, 1-2 parts of bentonite, 0.5-0.8 parts of sodium citrate, 0.1-0.3 parts of lanthanum nitrate, 0.1-0.4 parts of hydroxyacetone, 0.05-0.1 parts of polydimethylsiloxane, 0.05-0.1 parts of cationic starch ether quaternary ammonium salt, 0.02-0.08 parts of diethylenetriamine pentaacetate, 1-2 parts of wood vinegar, and 1-2 parts of coal gangue powder.

[0006] Preferably, the defluorination agent composition further comprises 0.2 to 0.6 parts by weight of disodium ethylenediaminetetraacetate.

[0007] Preferably, the defluorination agent composition further comprises 0.8 to 1.2 parts by weight of sodium aluminate.

[0008] Preferably, the defluorination agent composition further comprises 0.2 to 0.4 parts by weight of triethanolamine.

[0009] Preferably, the defluorination agent composition further comprises 0.1 to 0.3 parts by weight of disodium hydrogen phosphate.

[0010] Preferably, the defluorination agent composition further comprises 3 to 4 parts by weight of ferric chloride.

[0011] Preferably, the defluorination agent composition further comprises 0.5 to 0.7 parts by weight of dimethyldiallyl ammonium chloride.

[0012] Preferably, the defluoridation agent composition is composed of the following ingredients in parts by weight: 19 parts of polyaluminium chloride, 2.5 parts of diatomaceous earth, 1.5 parts of bentonite, 0.7 parts of sodium citrate, 0.2 parts of lanthanum nitrate, 0.3 parts of hydroxyacetone, 0.08 parts of polydimethylsiloxane, 0.07 parts of cationic starch ether quaternary ammonium salt, 0.05 parts of diethylenetriamine pentaacetate, 1.5 parts of wood vinegar, and 1.5 parts of coal gangue powder.

[0013] Preferably, the defluorination agent composition is composed of the following ingredients in parts by weight: 19 parts of polyaluminium chloride, 2.5 parts of diatomaceous earth, 1.5 parts of bentonite, 0.7 parts of sodium citrate, 0.2 parts of lanthanum nitrate, 0.3 parts of hydroxyacetone, 0.08 parts of polydimethylsiloxane, 0.07 parts of cationic starch ether quaternary ammonium salt, 0.05 parts of diethylenetriamine pentaacetate, 1.5 parts of wood vinegar, 1.5 parts of coal gangue powder, 0.4 parts of disodium ethylenediaminetetraacetate, 1 part of sodium aluminate, 0.3 parts of triethanolamine, 0.2 parts of disodium hydrogen phosphate, 3.5 parts of ferric chloride, and 0.6 parts of dimethyldiallyl ammonium chloride.

[0014] In the above technical solution, the cationic starch ether quaternary ammonium salt can be selected from 3-chloro-2-hydroxypropyl-trimethylammonium chloride.

[0015] On the basis of the above technical solution, the present invention further provides a method for preparing the above defluorination agent composition, comprising: 1) Dispersing a formulated amount of diatomaceous earth into deionized water, treating it under ultrasonic vibration conditions for 5 to 10 minutes, and then gradually sprinkling a formulated amount of bentonite into the water under stirring conditions until the sprinkling is complete, and continuing to stir for 5 to 10 minutes, and continuously applying ultrasonic vibration conditions during this stirring process to obtain a first mixture; 2) uniformly mixing the formulated amount of sodium citrate and lanthanum nitrate with the formulated amount of wood vinegar, and heating the mixture to 40-50° C. to obtain a second mixture; 3) taking a formula amount of hydroxyacetone and a formula amount of cationic starch ether quaternary ammonium salt, successively adding them to a formula amount of polyaluminium chloride, mixing them thoroughly, and then diluting them to 3 times the volume with deionized water, adjusting the temperature to 10-15° C., and then successively adding a formula amount of polydimethylsiloxane and a formula amount of diethylenetriamine pentaacetate thereto, mixing them evenly, to obtain a third mixture; 4) The first mixture and the second mixture are uniformly mixed, maintained at 40° C. for 2 to 3 hours, and then the formulated amount of coal gangue powder is added thereto, the temperature is raised to 50° C. and maintained for 1 to 2 hours, and then the third mixture is added thereto and mixed uniformly to obtain the defluorination agent composition.

[0016] The present invention provides a defluorination agent composition and a preparation method thereof. The technical scheme aims to improve the defluorination efficiency of polyaluminium chloride, and a compound formula with synergistic effect is designed for it. The composition takes polyaluminium chloride as the main component, and uses bentonite to disperse and thicken. It is suspended and gelled in water, which is conducive to enhancing the contact between fluoride ions and the defluoridation agent; at the same time, diatomaceous earth is used as an adsorbent to improve the removal effect of fluoride ions. Sodium citrate, as a surfactant, can form an emulsion in water, remove some pollutants, and alleviate their impact on the defluorination process. In addition, the present invention adds diethylenetriamine pentaacetate, polydimethylsiloxane, lanthanum nitrate and other ingredients, which cooperate with polyaluminium chloride to fully improve the defluorination effect. In terms of preparation method, the present invention designs a compounding scheme according to the physical properties of different components. The preparation method has low equipment requirements and high process efficiency. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. In addition, ordinary technicians in this field know that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0018] In the description of the present application, it should be understood that, unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by those skilled in the art of the present application. In addition, any terminology used is only for the purpose of describing specific embodiments and is not intended to limit the present application.

[0019] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0020] Example 1 A defluoridation agent composition comprises the following components in parts by weight: 19 parts of polyaluminium chloride, 2.5 parts of diatomaceous earth, 1.5 parts of bentonite, 0.7 parts of sodium citrate, 0.2 parts of lanthanum nitrate, 0.3 parts of hydroxyacetone, 0.08 parts of polydimethylsiloxane, 0.07 parts of cationic starch ether quaternary ammonium salt, 0.05 parts of diethylenetriamine pentaacetate, 1.5 parts of wood vinegar and 1.5 parts of coal gangue powder.

[0021] When the fluoride ion concentration in the treated solution is 30 mg / L, the defluoridation agent of the present invention is added at a final concentration of 1.8 g / L, and the adsorption reaches saturation after 20 minutes at a temperature of 32°C, a pH value of 6.6, and a stirring speed of 500 rpm. The fluoride ion removal rate reaches 99.1%.

[0022] Example 2 A defluoridation agent composition comprises the following components in parts by weight: 19 parts of polyaluminium chloride, 2.5 parts of diatomaceous earth, 1.5 parts of bentonite, 0.7 parts of sodium citrate, 0.2 parts of lanthanum nitrate, 0.3 parts of hydroxyacetone, 0.08 parts of polydimethylsiloxane, 0.07 parts of cationic starch ether quaternary ammonium salt, 0.05 parts of diethylenetriamine pentaacetate, 1.5 parts of wood vinegar, 1.5 parts of coal gangue powder, 0.4 parts of disodium ethylenediaminetetraacetate, 1 part of sodium metaaluminate, 0.3 parts of triethanolamine, 0.2 parts of disodium hydrogen phosphate, 3.5 parts of ferric chloride and 0.6 parts of dimethyldiallyl ammonium chloride.

[0023] When the fluoride ion concentration in the treated solution is 50 mg / L, the defluoridation agent of the present invention is added with a final concentration of 1.6 g / L, and the adsorption reaches saturation after 20 minutes at a temperature of 32°C, a pH value of 6.6, and a stirring speed of 500 rpm. The fluoride ion removal rate reaches 99.8%.

[0024] Example 3 A defluoridation agent composition comprises the following components in parts by weight: 18 parts of polyaluminium chloride, 2 parts of diatomaceous earth, 1 part of bentonite, 0.5 parts of sodium citrate, 0.1 parts of lanthanum nitrate, 0.1 parts of hydroxyacetone, 0.05 parts of polydimethylsiloxane, 0.05 parts of cationic starch ether quaternary ammonium salt, 0.02 parts of diethylenetriamine pentaacetate, 1 part of wood vinegar, and 1 part of coal gangue powder.

[0025] The preparation method of the above defluorination agent composition comprises: 1) dispersing a formulated amount of diatomaceous earth into deionized water, treating it under ultrasonic vibration for 5 minutes, and then gradually sprinkling a formulated amount of bentonite into the water under stirring until the sprinkling is complete, and continuing to stir for 5 minutes, and continuously applying ultrasonic vibration during this stirring process to obtain a first mixture; 2) uniformly mixing the formulated amount of sodium citrate and lanthanum nitrate with the formulated amount of wood vinegar, and heating the mixture to 40° C. to obtain a second mixture; 3) taking a formula amount of hydroxyacetone and a formula amount of cationic starch ether quaternary ammonium salt, successively adding them to a formula amount of polyaluminium chloride, mixing them thoroughly, and then diluting them to 3 times the volume with deionized water, adjusting the temperature to 10° C., and then successively adding a formula amount of polydimethylsiloxane and a formula amount of diethylenetriamine pentaacetate thereto, mixing them evenly, to obtain a third mixture; 4) The first mixture and the second mixture are uniformly mixed, maintained at 40° C. for 2 hours, and then the formulated amount of coal gangue powder is added thereto, the temperature is raised to 50° C. and maintained for 1 hour, and then the third mixture is added thereto and mixed uniformly to obtain the defluorination agent composition.

[0026] When the fluoride ion concentration in the treated solution is 40 mg / L, the defluoridation agent of the present invention is added at a final concentration of 2 g / L, and the adsorption reaches saturation after 30 minutes at a temperature of 33°C, a pH value of 6.7, and a stirring speed of 400 rpm. The fluoride ion removal rate reaches 98.5%.

[0027] Example 4 A defluoridation agent composition comprises the following components in parts by weight: 20 parts of polyaluminium chloride, 3 parts of diatomaceous earth, 2 parts of bentonite, 0.8 parts of sodium citrate, 0.3 parts of lanthanum nitrate, 0.4 parts of hydroxyacetone, 0.1 parts of polydimethylsiloxane, 0.1 parts of cationic starch ether quaternary ammonium salt, 0.08 parts of diethylenetriamine pentaacetate, 2 parts of wood vinegar, and 2 parts of coal gangue powder.

[0028] The preparation method of the above defluorination agent composition comprises: 1) dispersing a formulated amount of diatomaceous earth into deionized water, treating it under ultrasonic vibration for 10 minutes, and then gradually sprinkling a formulated amount of bentonite into the water under stirring until the sprinkling is complete, and continuing to stir for 10 minutes, and continuously applying ultrasonic vibration during this stirring process to obtain a first mixture; 2) uniformly mixing the formulated amount of sodium citrate and lanthanum nitrate with the formulated amount of wood vinegar, and heating the mixture to 50° C. to obtain a second mixture; 3) taking a formula amount of hydroxyacetone and a formula amount of cationic starch ether quaternary ammonium salt, successively adding them to a formula amount of polyaluminium chloride, mixing them thoroughly, diluting them to 3 times the volume with deionized water, adjusting the temperature to 15° C., and then successively adding a formula amount of polydimethylsiloxane and a formula amount of diethylenetriamine pentaacetate thereto, mixing them evenly, to obtain a third mixture; 4) The first mixture and the second mixture are uniformly mixed, maintained at 40° C. for 3 hours, and then the formulated amount of coal gangue powder is added thereto, the temperature is raised to 50° C. and maintained for 2 hours, and then the third mixture is added thereto and mixed uniformly to obtain the defluorination agent composition.

[0029] When the fluoride ion concentration in the treated solution was 35 mg / L, the defluoridation agent of the present invention was added at a final concentration of 1.5 g / L, and the adsorption reached saturation after 15 minutes at a temperature of 31°C, a pH value of 6.5, and a stirring speed of 400 rpm. The fluoride ion removal rate reached 98.9%.

[0030] In summary, after reading this detailed disclosure, it will be apparent to those skilled in the art that the aforementioned detailed disclosure may be presented only by way of example and may not be restrictive. Although not explicitly stated herein, it will be appreciated by those skilled in the art that this application is intended to encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0031] It should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and to simplify the present application, the present application combines various features into a single embodiment or its description. However, this does not mean that the combination of these features is necessary, and it is entirely possible for those skilled in the art to extract some of the features and understand them as separate embodiments when reading the present application.

[0032] It should be understood that the embodiments disclosed herein are illustrations of the principles of the present application. Other modified embodiments are also within the scope of the present application. The embodiments disclosed herein are merely examples and not limitations, and the embodiments of the present application are not limited to the embodiments precisely described above.

Claims

1. A defluorination agent composition, characterized in that: The invention comprises the following ingredients in parts by weight: 18-20 parts of polyaluminium chloride, 2-3 parts of diatomaceous earth, 1-2 parts of bentonite, 0.5-0.8 parts of sodium citrate, 0.1-0.3 parts of lanthanum nitrate, 0.1-0.4 parts of hydroxyacetone, 0.05-0.1 parts of polydimethylsiloxane, 0.05-0.1 parts of cationic starch ether quaternary ammonium salt, 0.02-0.08 parts of diethylenetriamine pentaacetate, 1-2 parts of wood vinegar and 1-2 parts of coal gangue powder.

2. A defluorination agent composition according to claim 1, characterized in that: The defluorination agent composition also includes 0.2-0.6 parts by weight of disodium ethylenediaminetetraacetate.

3. A defluorination agent composition according to claim 1, characterized in that: The defluoridating agent composition also includes 0.8 to 1.2 parts by weight of sodium metaaluminate.

4. A defluorination agent composition according to claim 1, characterized in that: The defluorination agent composition also includes 0.2-0.4 parts by weight of triethanolamine.

5. A defluorination agent composition according to claim 1, characterized in that: The defluoridating agent composition also includes 0.1 to 0.3 parts by weight of disodium hydrogen phosphate.

6. A defluorination agent composition according to claim 1, characterized in that: The defluorination agent composition also includes 3 to 4 parts by weight of ferric chloride.

7. A defluorination agent composition according to claim 1, characterized in that: The defluorination agent composition also includes 0.5-0.7 parts by weight of dimethyldiallyl ammonium chloride.

8. A defluorination agent composition according to claim 1, characterized in that: The defluoridation agent composition is composed of the following components in parts by weight: 19 parts of polyaluminium chloride, 2.5 parts of diatomaceous earth, 1.5 parts of bentonite, 0.7 parts of sodium citrate, 0.2 parts of lanthanum nitrate, 0.3 parts of hydroxyacetone, 0.08 parts of polydimethylsiloxane, 0.07 parts of cationic starch ether quaternary ammonium salt, 0.05 parts of diethylenetriamine pentaacetate, 1.5 parts of wood vinegar, and 1.5 parts of coal gangue powder.

9. A defluorination agent composition according to claim 1, characterized in that: The defluoridation agent composition is composed of the following components in parts by weight: 19 parts of polyaluminium chloride, 2.5 parts of diatomaceous earth, 1.5 parts of bentonite, 0.7 parts of sodium citrate, 0.2 parts of lanthanum nitrate, 0.3 parts of hydroxyacetone, 0.08 parts of polydimethylsiloxane, 0.07 parts of cationic starch ether quaternary ammonium salt, 0.05 parts of diethylenetriamine pentaacetate, 1.5 parts of wood vinegar, 1.5 parts of coal gangue powder, 0.4 parts of disodium ethylenediaminetetraacetate, 1 part of sodium metaaluminate, 0.3 parts of triethanolamine, 0.2 parts of disodium hydrogen phosphate, 3.5 parts of ferric chloride, and 0.6 parts of dimethyldiallyl ammonium chloride.

10. The method for preparing the defluorination agent composition according to claim 1, characterized in that: include: 1) Dispersing a formulated amount of diatomaceous earth into deionized water, treating it under ultrasonic vibration conditions for 5 to 10 minutes, and then gradually sprinkling a formulated amount of bentonite into the water under stirring conditions until the sprinkling is complete, and continuing to stir for 5 to 10 minutes, and continuously applying ultrasonic vibration conditions during this stirring process to obtain a first mixture; 2) uniformly mixing the formulated amount of sodium citrate and lanthanum nitrate with the formulated amount of wood vinegar, and heating the mixture to 40-50° C. to obtain a second mixture; 3) taking a formula amount of hydroxyacetone and a formula amount of cationic starch ether quaternary ammonium salt, successively adding them to a formula amount of polyaluminium chloride, mixing them thoroughly, and then diluting them to 3 times the volume with deionized water, adjusting the temperature to 10-15° C., and then successively adding a formula amount of polydimethylsiloxane and a formula amount of diethylenetriamine pentaacetate thereto, mixing them evenly, to obtain a third mixture; 4) The first mixture and the second mixture are uniformly mixed, maintained at 40° C. for 2 to 3 hours, and then the formulated amount of coal gangue powder is added thereto, the temperature is raised to 50° C. and maintained for 1 to 2 hours, and then the third mixture is added thereto and mixed uniformly to obtain the defluorination agent composition.