Multifunctional fly ash chelating agent and preparation method thereof

Abstract

The invention relates to the field of chelating agents and preparation methods thereof, in particular to a multifunctional fly ash chelating agent and a preparation method thereof, and the multifunctional fly ash chelating agent comprises the following materials: dithiocarbamate, sodium thiosulfate, thioate, 2, 6-diamide pyridine ethanethiol, 1, 3-dibenzamide ethanethiol, ethylenediaminetetraacetic acid, a drying agent and an additive. The method comprises the following steps: refining a material; performing pre-stirring; putting in batches; performing drying; performing multi-dimensional mixing; the dithiocar-bamate, the sodium thiosulfate, the thioate, the 2, 6-diamide pyridine ethanethiol, the 1, 3-dibenzamide ethanethiol and the ethylenediaminetetraacetic acid are used as core components of the fly ash chelating agent, so that the fly ash chelating agent can adapt to different heavy metal treatment requirements under the condition of a relatively wide PH value, can be comprehensively and effectively combined with heavy metal ions in fly ash, and can be used for treating heavy metal ions in the fly ash. Therefore, the leaching property of heavy metals and the environmental risk are reduced, and the method has multifunctional application in the field of environmental protection, the field of construction, the field of industry and the like.

Description

Technical Field

[0001] The invention relates to the field of chelating agents and preparation methods thereof, in particular to a multifunctional fly ash chelating agent and a preparation method thereof. Background Art

[0002] Fly ash chelating agent is a chemical substance that can adsorb chemical elements. In the industrial production process, a considerable amount of solid waste such as fly ash is often produced, and these solid wastes often carry many useful components. Fly ash chelating agent can adsorb these useful components and extract them from the solid waste.

[0003] The existing fly ash chelating agent is mainly prepared by fully dissolving and uniformly mixing organic sodium chloride, sodium tetraborate, triaminomethane and water, but the existing fly ash chelating agent formula and preparation method have the following disadvantages; 1. The prepared fly ash chelating agent is not stable enough. During storage or transportation, it is easy to decompose or become ineffective after being exposed to moisture; 2. The fly ash chelating agent prepared by the above formula can remove various heavy metals such as lead (Pb²⁺), cadmium (Cd²⁺), chromium (Cr³⁺ / Cr 6 ⁺), copper (Cu²⁺), and zinc (Zn²⁺) have chelating effects, but they still have certain limitations and are not ideal for chelating some metals; 3. During the preparation process, it is difficult to ensure uniform distribution of multiple ingredients.

[0004] Therefore, in view of the problems that it is difficult to ensure uniform distribution of components in the above preparation process, and the prepared fly ash chelating agent is prone to decomposition or failure of components after being exposed to moisture, and the chelation effect of certain metals is not ideal, a multifunctional fly ash chelating agent and its preparation method can be designed. Summary of the invention

[0005] In order to overcome the problem that it is difficult to ensure uniform distribution of its components during the preparation process, and the prepared fly ash chelating agent is prone to decomposition or failure of its components after being exposed to moisture, resulting in unsatisfactory chelating effect on certain metals.

[0006] The technical solution of the present invention is: a multifunctional fly ash chelating agent, comprising the following materials: dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, ethylenediaminetetraacetic acid, desiccant, additives: by weight, the proportion is as follows; Sodium dithioaminocyanurate: 10 to 20 parts; Sodium thiosulfate: 3 to 5 parts; Thioacid salt: 3 to 5 parts; 2,6-diamide pyridine ethanethiol: 1 to 5 parts; 1,3-dibenzamide ethanethiol: 0.2 to 2 parts; Ethylenediaminetetraacetic acid: 2 to 3 parts; Desiccant: 1 to 5 parts; Additives: 30 to 40 parts.

[0007] Preferably, the additive is one of clay and starch.

[0008] Preferably, the desiccant is montmorillonite or molecular sieve.

[0009] A method for preparing a multifunctional fly ash chelating agent, comprising the multifunctional fly ash chelating agent described above, and the steps are as follows: Step 1: prepare dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid of good quality and purity that meet the requirements, weigh the dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid according to the formula and pour them into the pretreatment chamber for treatment; The pretreatment chamber needs to be processed in two steps. First, the above materials are crushed. The crushing equipment is set to 30 to 40 seconds and the speed is set to 2000 rpm to 3000 rpm to make the powder of the above materials more refined to avoid agglomeration. Then, the mixed powder is transported to the mixing chamber through a vacuum conveying pump. The mixing equipment is set to 20 to 40 minutes and the speed is set to 100 rpm to 200 rpm to make mixed powder A and collect the mixed powder A. Step 2: Pour the additive into the mixing equipment, turn on the switch and let the mixing paddle of the mixing equipment stir continuously at 100 rpm; The mixed powder A is divided into three equal parts, and the parts are added into the mixing device when the mixing device is stirred for 1 minute, 10 minutes, and 20 minutes, respectively. Then, the heating function in the mixing device is started to dry the internal powder at 50°C to 60°C for 10 minutes to remove the moisture contained in the powder. The heating function is turned off, the sealing cover of the mixing device is covered, and the external driving device of the mixing device is started to drive the mixing device to swing back and forth within a range of ±30° with the driving device rotating shaft as the center. In this way, the mixed powder A and the additive are mixed evenly to prepare the mixed powder B. Step 3: Open the sealing cover, sprinkle the desiccant into the mixed powder B, and stir for 20 minutes to prepare a multifunctional fly ash chelating agent; Step 4: After quantitative packaging, the multifunctional fly ash chelating agent is stored in a dry, ventilated and cool environment.

[0010] Preferably, the multifunctional fly ash chelate packaging material should adopt a paper-plastic composite bag; the multifunctional fly ash chelate packaging specification is 25kg / bag.

[0011] Beneficial effects of the present invention: The present invention uses dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol and ethylenediaminetetraacetic acid as the core components of the fly ash chelating agent, which can adapt to different heavy metal treatment requirements under a wide pH value condition, comprehensively and effectively combine with heavy metal ions in fly ash to form a stable chelate, thereby reducing the leaching property and environmental risks of heavy metals, and has multifunctional applications in the fields of environmental protection, construction, industry, etc. The multifunctional fly ash chelating agent is made into powder by additives, and a desiccant is added. During the storage and transportation of the multifunctional fly ash chelating agent, the moisture in the multifunctional fly ash chelating agent can be effectively removed to prevent the multifunctional fly ash chelating agent from being damp, thereby ensuring the effectiveness of the components in the multifunctional fly ash chelating agent. The multifunctional fly ash chelating agent is prepared through the processes of material refinement - pre-mixing - batch addition - drying - multi-dimensional mixing, etc., which can make the components evenly distributed, ensuring that the prepared multifunctional fly ash chelating agent is of excellent quality, can remain stable during multiple storage processes, and is not easy to decompose. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the embodiments.

[0013] Example 1

[0014] The present invention provides an embodiment: a multifunctional fly ash chelating agent, comprising the following materials: dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, ethylenediaminetetraacetic acid, a desiccant, and an additive: the proportions by weight are as follows; Sodium dithioaminocyanurate: 15 parts; Sodium thiosulfate: 3 parts; Thioacid salt: 3 parts; 2,6-diamide pyridine ethanethiol: 1.5 parts; 1,3-dibenzamide ethanethiol: 0.5 parts; Ethylenediaminetetraacetic acid: 2 parts; Desiccant: 2 parts; Additives: 30 parts.

[0015] A method for preparing a multifunctional fly ash chelating agent, comprising the multifunctional fly ash chelating agent described above, and the steps are as follows: Step 1: prepare dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid of good quality and purity that meet the requirements, weigh the dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid according to the formula and pour them into the pretreatment chamber for treatment; The pretreatment chamber needs to be processed in two steps. First, the above materials are crushed. The crushing equipment is set to 30 seconds and the speed is set to 2000 rpm to make the powder of the above materials more refined to avoid agglomeration. Then, the mixed powder is transported to the mixing chamber through a vacuum conveying pump. The mixing equipment is set to 30 minutes and the speed is set to 100 rpm to make mixed powder A and collect the mixed powder A. Step 2: Pour the additive into the mixing equipment, turn on the switch and let the mixing paddle of the mixing equipment stir continuously at 100 rpm; The mixed powder A is divided into three equal parts, and the parts are added into the mixing device when the mixing device is stirred for 1 minute, 10 minutes, and 20 minutes, respectively. Then, the heating function in the mixing device is started to dry the internal powder at 50° C. for 10 minutes to remove the moisture contained in the powder. The heating function is turned off, the sealing cover of the mixing device is covered, and the external driving device of the mixing device is started to drive the mixing device to swing back and forth within a range of ±30° with the driving device rotating shaft as the center. In this way, the mixed powder A and the additive are mixed evenly to prepare the mixed powder B. Step 3: Open the sealing cover, sprinkle the desiccant into the mixed powder B, and stir for 20 minutes to prepare a multifunctional fly ash chelating agent; The multifunctional fly ash chelating agent prepared in Example 1 and the preparation method thereof can adapt to different heavy metal treatment requirements under a wide pH value condition, comprehensively and effectively combine with heavy metal ions in fly ash to form a stable chelate, thereby reducing the leaching of heavy metals and environmental risks, and has multifunctional applications in the fields of environmental protection, construction, industry, etc.

[0016] Example 2

[0017] The present invention provides an embodiment: a multifunctional fly ash chelating agent, comprising the following materials: dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, ethylenediaminetetraacetic acid, a desiccant, and an additive: the proportions by weight are as follows; Sodium dithioaminocyanurate: 15 parts; Sodium thiosulfate: 4 parts; Thioacid salt: 3 parts; 2,6-diamide pyridine ethanethiol: 2 parts; 1,3-dibenzamide ethanethiol: 0.5 parts; Ethylenediaminetetraacetic acid: 2 parts; Desiccant: 3 parts; Additives: 35 parts.

[0018] A method for preparing a multifunctional fly ash chelating agent, comprising the multifunctional fly ash chelating agent described above, and the steps are as follows: Step 1: prepare dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid of good quality and purity that meet the requirements, weigh the dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid according to the formula and pour them into the pretreatment chamber for treatment; The pretreatment chamber needs to be processed in two steps. First, the above materials are crushed. The crushing equipment is set to 30 seconds and the speed is set to 2000 rpm to make the powder of the above materials more refined to avoid agglomeration. Then, the mixed powder is transported to the mixing chamber through a vacuum conveying pump. The mixing equipment is set to 30 minutes and the speed is set to 100 rpm to make mixed powder A and collect the mixed powder A. Step 2: Pour the additive into the mixing equipment, turn on the switch and let the mixing paddle of the mixing equipment stir continuously at 100 rpm; The mixed powder A is divided into three equal parts, and the parts are added into the mixing device when the mixing device is stirred for 1 minute, 10 minutes, and 20 minutes, respectively. Then, the heating function in the mixing device is started to dry the internal powder at 50° C. for 10 minutes to remove the moisture contained in the powder. The heating function is turned off, the sealing cover of the mixing device is covered, and the external driving device of the mixing device is started to drive the mixing device to swing back and forth within a range of ±30° with the driving device rotating shaft as the center. In this way, the mixed powder A and the additive are mixed evenly to prepare the mixed powder B. Step 3: Open the sealing cover, sprinkle the desiccant into the mixed powder B, and stir for 20 minutes to prepare a multifunctional fly ash chelating agent; A multifunctional fly ash chelating agent and a preparation method thereof prepared by Example 2, wherein the multifunctional fly ash chelating agent is made into a powder by means of an additive, and a desiccant is added. During the storage and transportation of the multifunctional fly ash chelating agent, the moisture in the multifunctional fly ash chelating agent can be effectively removed to prevent the multifunctional fly ash chelating agent from getting damp, thereby ensuring the effectiveness of the components in the multifunctional fly ash chelating agent.

Claims

1. A multifunctional fly ash chelating agent, characterized in that: The following materials are included: dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, ethylenediaminetetraacetic acid, desiccant, additives: by weight, the proportion is as follows; Sodium dithioaminocyanurate: 10 to 20 parts; Sodium thiosulfate: 3 to 5 parts; Thioacid salt: 3 to 5 parts; 2,6-diamide pyridine ethanethiol: 1 to 5 parts; 1,3-dibenzamide ethanethiol: 0.2 to 2 parts; Ethylenediaminetetraacetic acid: 2 to 3 parts; Desiccant: 1 to 5 parts; Additives: 30 to 40 parts.

2. The multifunctional fly ash chelating agent according to claim 1, characterized in that: Additive: Use one of clay and starch.

3. The multifunctional fly ash chelating agent according to claim 1, characterized in that: The desiccant is selected from montmorillonite and molecular sieve.

4. A method for preparing a multifunctional fly ash chelating agent, characterized in that The method comprises the following steps: Step 1: prepare dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid of good quality and purity that meet the requirements, weigh the dithiocarbamate, sodium thiosulfate, thioacid salt, 2,6-diamide pyridine ethanethiol, 1,3-dibenzamide ethanethiol, and ethylenediaminetetraacetic acid according to the formula and pour them into the pretreatment chamber for treatment; The pretreatment chamber needs to be processed in two steps. First, the above materials are crushed. The crushing equipment is set to 30 to 40 seconds and the speed is set to 2000 rpm to 3000 rpm to make the powder of the above materials more refined to avoid agglomeration. Then, the mixed powder is transported to the mixing chamber through a vacuum conveying pump. The mixing equipment is set to 20 to 40 minutes and the speed is set to 100 rpm to 200 rpm to make mixed powder A and collect the mixed powder A. Step 2: Pour the additive into the mixing equipment, turn on the switch and let the mixing paddle of the mixing equipment stir continuously at 100 rpm; The mixed powder A is divided into three equal parts, and the parts are added into the mixing device when the mixing device is stirred for 1 minute, 10 minutes, and 20 minutes, respectively. Then, the heating function in the mixing device is started to dry the internal powder at 50°C to 60°C for 10 minutes to remove the moisture contained in the powder. The heating function is turned off, the sealing cover of the mixing device is covered, and the external driving device of the mixing device is started to drive the mixing device to swing back and forth within a range of ±30° with the driving device rotating shaft as the center. In this way, the mixed powder A and the additive are mixed evenly to prepare the mixed powder B. Step 3: Open the sealing cover, sprinkle the desiccant into the mixed powder B, and stir for 20 minutes to prepare a multifunctional fly ash chelating agent; Step 4: After quantitative packaging, the multifunctional fly ash chelating agent is stored in a dry, ventilated and cool environment.

5. The multifunctional fly ash chelating agent and preparation method thereof according to claim 1, characterized in that: Multifunctional fly ash chelate packaging should be made of paper-plastic composite bags; The packaging specification of multifunctional fly ash chelate is 25kg / bag.