Integrated device and process for preparing flocculant powder from fly ash

Abstract

The integrated device comprises an extraction chamber, an aging reaction chamber, a rotary spray drying chamber and a product collection chamber, a discharge port in the bottom of the extraction chamber is connected with the aging reaction chamber through a pipeline, the bottom of the aging reaction chamber is connected with a spray gun through a pipeline, the spray gun extends into the rotary spray drying chamber, and the rotary spray drying chamber is connected with the product collection chamber through a pipeline. The product collecting chamber is located under a discharging port of the rotary spray drying chamber. An electric heating layer is arranged at the bottom of the extraction chamber; a filter is arranged at a discharge hole in the bottom of the extraction chamber. The device is an integrated continuous production device, has experiment and detection functions, is simple to operate and is suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of flocculant preparation, and in particular relates to an integrated device and process for preparing flocculant powder from fly ash. Background Art

[0002] As an emerging inorganic polymer flocculant, polysilicate aluminum iron flocculant has become a hot spot for research and development in the industry, but it is still in the promotion stage due to the limited production cost. Fly ash is widely used in the preparation of water treatment flocculants (including polysilicate aluminum iron flocculants) because of its low price and large amount of silicon, aluminum and iron elements. The current mainstream synthesis direction of research is activation, acid leaching, aging and powder making. For example, Chinese patent CN10346677A discloses a method for producing a composite coagulant using fly ash, which is divided into 5 steps: 1. Acidification pretreatment; 2. Calcination activation; 3. Acid dissolution reaction; 4. Polymerization reaction; 5. Drying and powder making; 6. Repolymerization before use. These process flows have problems such as numerous equipment requirements and discontinuous process flows, which greatly limit the production efficiency of fly ash flocculant powder. Summary of the invention

[0003] In view of the above problems, the object of the present invention is to provide an integrated device and process for preparing flocculant powder from fly ash.

[0004] The specific technical solutions are as follows: An integrated device for preparing flocculant powder from fly ash comprises a leaching chamber, an aging reaction chamber, a rotary spray drying chamber and a product collecting chamber. The bottom discharge port of the leaching chamber is connected to the aging reaction chamber through a pipeline, the bottom of the aging reaction chamber is connected to a spray gun through a pipeline, the spray gun extends into the rotary spray drying chamber, and the product collecting chamber is located directly below the discharge port of the rotary spray drying chamber; an electric heating layer is provided at the bottom of the leaching chamber, and a filter is provided at the bottom discharge port of the leaching chamber.

[0005] Furthermore, a feeding funnel and an acid material feeding port are provided on the top of the leaching chamber, a fly ash feeding metering pump is provided at the feeding funnel, and an acid material feeding metering pump is provided at the acid material feeding port.

[0006] Furthermore, a stirrer is provided in the leaching chamber, and the stirrer extends to the bottom of the leaching chamber.

[0007] Furthermore, an electric valve and a suction pump are provided on the pipeline connecting the leaching chamber and the aging reaction chamber.

[0008] Furthermore, a spare feed port and a vent valve are provided on the top of the aging reaction chamber, and the top of the aging reaction chamber is connected to the liquid storage tank through a pipeline, a filter material is provided at the bottom outlet of the aging reaction chamber, and a discharge valve is provided on the pipeline connecting the aging reaction chamber and the spray gun.

[0009] Furthermore, the rotary spray drying chamber includes a rotatable barrel body, and a scraper brush is provided on the inner wall of the barrel body. The upper end of the scraper brush is fixed on an external bracket, and the lower end extends vertically to below the inner wall of the barrel body.

[0010] A process for preparing flocculant powder from fly ash using the above device comprises the following steps: 1) The fly ash after high-temperature roasting and activation treatment is metered by the fly ash dosing pump and then added to the leaching chamber through the dosing funnel. The acid solution is metered by the acid dosing pump and then added to the leaching chamber through the acid inlet. At the same time, the electric heating layer and the stirrer are turned on to perform element leaching according to the designed temperature. 2) After the extraction is completed, the electric valve and the suction pump are opened, and the extraction mixture is filtered through the filter, and the solid residue is discharged as solid waste. The extraction liquid is transported to the aging reaction chamber through the suction pump for aging reaction, and the reaction raw materials can be added as needed through the spare feed port to complete the derivatization process; 3) The matured mixture enters the spray gun through the discharge valve and is atomized and sprayed into the rotating barrel body by the spray gun. The moisture in the sample evaporates in the rotary spray drying chamber, and the solid sample adheres to the inner wall of the barrel body as it rotates. During the rotation process, it is hung by the scraper and brush and enters the product collection chamber.

[0011] The beneficial effects of the present invention are: 1) It can realize the continuous production of fly ash to prepare flocculants and improve production efficiency; 2) A spare feeding port is set in the aging reaction chamber, and fly ash can be added according to the actual effect to increase the powder extraction rate of the flocculant; 3) Rotary spray drying combines the effects of temperature and rotating centrifugal force to improve the efficiency of flocculant powder extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention.

[0013] 1. Extraction chamber; 11. Electric heating layer; 12. Filter; 13. Feeding funnel; 14. Acid material adding inlet; 15. Fly ash sampling and metering pump; 16. Acid material sampling and metering pump; 17. Agitator; 2. Aging reaction chamber; 21. Alternate feed inlet; 22. Vent valve; 23. Discharge valve; 3. Rotary spray drying chamber; 31. Barrel body; 32. Scrape brush; 4. Product collection chamber; 5. Spray gun; 6. Electric valve; 7. Filter pump; 8. Liquid storage tank. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.

[0015] like Figure 1As shown, an integrated device for preparing flocculant powder from fly ash comprises a leaching chamber 1, an aging reaction chamber 2, a rotary spray drying chamber 3 and a product collecting chamber 4, the bottom discharge port of the leaching chamber 1 is connected to the aging reaction chamber 2 through a pipeline, an electric heating layer 11 is provided at the bottom of the leaching chamber 1, a filter 12 is provided at the bottom discharge port of the leaching chamber 1, a feeding funnel 13 and an acid material adding port 14 are provided at the top of the leaching chamber 1, a fly ash adding metering pump 15 is provided at the feeding funnel 13, an acid material adding metering pump 16 is provided at the acid material adding port 14, a stirrer 17 is also provided in the leaching chamber 1, and the stirrer 17 extends to the bottom of the leaching chamber 1, and an electric valve 6 and a suction pump 7 are provided on the pipeline connecting the leaching chamber 1 and the aging reaction chamber 2. A spare feed port 21 and a vent valve 22 are provided at the top of the aging reaction chamber 2, and the top of the aging reaction chamber 2 is connected to the liquid storage tank 8 through a pipeline, a filter material is provided at the bottom outlet of the aging reaction chamber 2, the bottom of the aging reaction chamber 2 is connected to the spray gun 5 through a pipeline, the spray gun 5 extends into the rotary spray drying chamber 3, and a discharge valve 23 is provided on the pipeline connecting the aging reaction chamber 2 and the spray gun 5. The rotary spray drying chamber 3 includes a rotatable barrel body 31, and a scraper 32 is provided on the inner wall of the barrel body 31. The upper end of the scraper 32 is fixed on an external bracket, and the lower end extends vertically to the bottom of the inner wall of the barrel body 31. The product collection chamber 4 is located directly below the discharge port of the rotary spray drying chamber 3.

[0016] A process for preparing flocculant powder from fly ash using the above device comprises the following steps: 1) The fly ash after high-temperature roasting and activation treatment is metered by the fly ash sample metering pump 15 and then added to the leaching chamber 1 through the feeding funnel 13. The acid solution is metered by the acid sample metering pump 16 and then added to the leaching chamber 1 through the acid material adding port 14. At the same time, the electric heating layer 11 and the stirrer 17 are turned on to perform element leaching according to the designed temperature. 2) After the extraction is completed, the electric valve 6 and the suction pump 7 are opened, and the extraction mixture is filtered through the filter 12, and the solid residue is discharged as solid waste. The extraction liquid is transported to the aging reaction chamber 2 through the suction pump 7 for aging reaction, and the reaction raw materials can be added as needed through the spare feed port 21 to complete the derivatization process; 3) The matured mixture enters the spray gun 5 through the discharge valve 23, and is atomized and sprayed into the rotating barrel body 31 by the spray gun 5. The moisture in the sample evaporates in the rotary spray drying chamber 3, and the solid sample adheres to the inner wall of the barrel body 31 as it rotates. During the rotation, it is hung by the scraper 32 and enters the product collection chamber 4.

Claims

1. An integrated device for preparing flocculant powder from fly ash, characterized in that: The invention comprises an extraction chamber (1), an aging reaction chamber (2), a rotary spray drying chamber (3) and a product collection chamber (4); the bottom discharge port of the extraction chamber (1) is connected to the aging reaction chamber (2) via a pipeline; the bottom of the aging reaction chamber (2) is connected to a spray gun (5) via a pipeline; the spray gun (5) extends into the rotary spray drying chamber (3); and the product collection chamber (4) is located directly below the discharge port of the rotary spray drying chamber (3); An electric heating layer (11) is provided at the bottom of the leaching chamber (1), and a filter (12) is provided at the discharge port at the bottom of the leaching chamber (1).

2. The integrated device for preparing flocculant powder from fly ash as claimed in claim 1, characterized in that: A feeding funnel (13) and an acid material feeding port (14) are provided at the top of the leaching chamber (1). A fly ash feeding metering pump (15) is provided at the feeding funnel (13), and an acid material feeding metering pump (16) is provided at the acid material feeding port (14).

3. The integrated device for preparing flocculant powder from fly ash as claimed in claim 2, characterized in that: A stirrer (17) is also provided in the extraction chamber (1), and the stirrer (17) extends to the bottom of the extraction chamber (1).

4. The integrated device for preparing flocculant powder from fly ash as claimed in claim 3, characterized in that: An electric valve (6) and a filtration pump (7) are provided on the pipeline connecting the leaching chamber (1) and the aging reaction chamber (2).

5. The integrated device for preparing flocculant powder from fly ash as claimed in claim 4, characterized in that: A spare feed port (21) and a vent valve (22) are provided at the top of the aging reaction chamber (2), and the top of the aging reaction chamber (2) is connected to the liquid storage tank (8) via a pipeline. A filter material is provided at the bottom outlet of the aging reaction chamber (2), and a discharge valve (23) is provided on the pipeline connecting the aging reaction chamber (2) and the spray gun (5).

6. The integrated device for preparing flocculant powder from fly ash as claimed in claim 5, characterized in that: The rotary spray drying chamber (3) comprises a rotatable barrel body (31), and a scraper (32) is provided on the inner wall of the barrel body (31). The upper end of the scraper (32) is fixed to an external bracket, and the lower end extends vertically to below the inner wall of the barrel body (31).

7. A process for preparing flocculant powder from fly ash using the device as claimed in claim 6, characterized in that: The steps include: 1) fly ash that has been subjected to high-temperature roasting and activation treatment is metered by a fly ash sample metering pump (15) and then added to a leaching chamber (1) through a feeding funnel (13); acid liquid is metered by an acid sample metering pump (16) and then added to the leaching chamber (1) through an acid material addition port (14); and the electric heating layer (11) and the stirrer (17) are turned on at the same time to perform element leaching according to the designed temperature; 2) After the extraction is completed, the electric valve (6) and the suction pump (7) are opened, and the extraction mixture is filtered through the filter (12), and the solid residue is discharged as solid waste. The extraction liquid is transported to the aging reaction chamber (2) through the suction pump (7) for aging reaction, and the reaction raw materials can be added as required through the spare feed port (21) to complete the derivatization process; 3) The matured mixture enters the spray gun (5) through the discharge valve (23), and is atomized by the spray gun (5) and sprayed into the rotating barrel body (31). The water in the sample evaporates in the rotary spray drying chamber (3), and the solid sample adheres to the inner wall of the barrel body (31) as it rotates. During the rotation, it is hung by the scraper (32) and enters the product collection chamber (4).

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